validationES2.cpp

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Author : Michael Spang
Date : 2019-05-21 21:26:26
Hash : ab6a59b2
Message : Vulkan: Submit semaphores from glWaitSemaphoreEXT & glSignalSemaphoreEXT Implement submission of client semaphores passed to glWaitSemaphoreEXT & glSignalSemaphoreEXT. This also relaxes the expectation that we will not flush() if there are no commands. Signaling semaphores in particular requires queue submission irrespective of whether there are any command buffers to submit. If there are neither commands nor semaphores, we can still skip queue submission. WebGL runs in Chrome with ANGLE & Vulkan interop as of this patch, albeit with incorrect synchronization due to texture barriers not being implemented yet. Quite a few flags are needed to try this: GN args: angle_vulkan_conformant_configs_only=true chrome \ --enable-features=UseSkiaRenderer,UiGpuRasterization \ --enable-gpu-rasterization \ --enable-oop-rasterization \ --enable-vulkan \ --use-gl=angle \ --use-angle=vulkan Bug: angleproject:3289 Change-Id: I3d49c230a2fbf0cd2a2b943b05ded0e4604cc313 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1623815 Commit-Queue: Michael Spang <spang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>
src/libANGLE/validationES2.cpp
//
// Copyright (c) 2013-2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// validationES2.cpp: Validation functions for OpenGL ES 2.0 entry point parameters

#include "libANGLE/validationES2_autogen.h"

#include <cstdint>

#include "common/mathutil.h"
#include "common/string_utils.h"
#include "common/utilities.h"
#include "libANGLE/Context.h"
#include "libANGLE/ErrorStrings.h"
#include "libANGLE/Fence.h"
#include "libANGLE/Framebuffer.h"
#include "libANGLE/FramebufferAttachment.h"
#include "libANGLE/Renderbuffer.h"
#include "libANGLE/Shader.h"
#include "libANGLE/Texture.h"
#include "libANGLE/Uniform.h"
#include "libANGLE/VertexArray.h"
#include "libANGLE/formatutils.h"
#include "libANGLE/validationES.h"
#include "libANGLE/validationES2.h"
#include "libANGLE/validationES3_autogen.h"

namespace gl
{
using namespace err;

namespace
{

bool IsPartialBlit(gl::Context *context,
                   const FramebufferAttachment *readBuffer,
                   const FramebufferAttachment *writeBuffer,
                   GLint srcX0,
                   GLint srcY0,
                   GLint srcX1,
                   GLint srcY1,
                   GLint dstX0,
                   GLint dstY0,
                   GLint dstX1,
                   GLint dstY1)
{
    const Extents &writeSize = writeBuffer->getSize();
    const Extents &readSize  = readBuffer->getSize();

    if (srcX0 != 0 || srcY0 != 0 || dstX0 != 0 || dstY0 != 0 || dstX1 != writeSize.width ||
        dstY1 != writeSize.height || srcX1 != readSize.width || srcY1 != readSize.height)
    {
        return true;
    }

    if (context->getState().isScissorTestEnabled())
    {
        const Rectangle &scissor = context->getState().getScissor();
        return scissor.x > 0 || scissor.y > 0 || scissor.width < writeSize.width ||
               scissor.height < writeSize.height;
    }

    return false;
}

template <typename T>
bool ValidatePathInstances(gl::Context *context,
                           GLsizei numPaths,
                           const void *paths,
                           GLuint pathBase)
{
    const auto *array = static_cast<const T *>(paths);

    for (GLsizei i = 0; i < numPaths; ++i)
    {
        const GLuint pathName = array[i] + pathBase;
        if (context->isPathGenerated(pathName) && !context->isPath(pathName))
        {
            context->validationError(GL_INVALID_OPERATION, kNoSuchPath);
            return false;
        }
    }
    return true;
}

bool ValidateInstancedPathParameters(gl::Context *context,
                                     GLsizei numPaths,
                                     GLenum pathNameType,
                                     const void *paths,
                                     GLuint pathBase,
                                     GLenum transformType,
                                     const GLfloat *transformValues)
{
    if (!context->getExtensions().pathRendering)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (paths == nullptr)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidPathNameArray);
        return false;
    }

    if (numPaths < 0)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidPathNumPaths);
        return false;
    }

    if (!angle::IsValueInRangeForNumericType<std::uint32_t>(numPaths))
    {
        context->validationError(GL_INVALID_OPERATION, kIntegerOverflow);
        return false;
    }

    std::uint32_t pathNameTypeSize = 0;
    std::uint32_t componentCount   = 0;

    switch (pathNameType)
    {
        case GL_UNSIGNED_BYTE:
            pathNameTypeSize = sizeof(GLubyte);
            if (!ValidatePathInstances<GLubyte>(context, numPaths, paths, pathBase))
                return false;
            break;

        case GL_BYTE:
            pathNameTypeSize = sizeof(GLbyte);
            if (!ValidatePathInstances<GLbyte>(context, numPaths, paths, pathBase))
                return false;
            break;

        case GL_UNSIGNED_SHORT:
            pathNameTypeSize = sizeof(GLushort);
            if (!ValidatePathInstances<GLushort>(context, numPaths, paths, pathBase))
                return false;
            break;

        case GL_SHORT:
            pathNameTypeSize = sizeof(GLshort);
            if (!ValidatePathInstances<GLshort>(context, numPaths, paths, pathBase))
                return false;
            break;

        case GL_UNSIGNED_INT:
            pathNameTypeSize = sizeof(GLuint);
            if (!ValidatePathInstances<GLuint>(context, numPaths, paths, pathBase))
                return false;
            break;

        case GL_INT:
            pathNameTypeSize = sizeof(GLint);
            if (!ValidatePathInstances<GLint>(context, numPaths, paths, pathBase))
                return false;
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kInvalidPathNameType);
            return false;
    }

    switch (transformType)
    {
        case GL_NONE:
            componentCount = 0;
            break;
        case GL_TRANSLATE_X_CHROMIUM:
        case GL_TRANSLATE_Y_CHROMIUM:
            componentCount = 1;
            break;
        case GL_TRANSLATE_2D_CHROMIUM:
            componentCount = 2;
            break;
        case GL_TRANSLATE_3D_CHROMIUM:
            componentCount = 3;
            break;
        case GL_AFFINE_2D_CHROMIUM:
        case GL_TRANSPOSE_AFFINE_2D_CHROMIUM:
            componentCount = 6;
            break;
        case GL_AFFINE_3D_CHROMIUM:
        case GL_TRANSPOSE_AFFINE_3D_CHROMIUM:
            componentCount = 12;
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidTransformation);
            return false;
    }
    if (componentCount != 0 && transformValues == nullptr)
    {
        context->validationError(GL_INVALID_VALUE, kNoTransformArray);
        return false;
    }

    angle::CheckedNumeric<std::uint32_t> checkedSize(0);
    checkedSize += (numPaths * pathNameTypeSize);
    checkedSize += (numPaths * sizeof(GLfloat) * componentCount);
    if (!checkedSize.IsValid())
    {
        context->validationError(GL_INVALID_OPERATION, kIntegerOverflow);
        return false;
    }

    return true;
}

bool IsValidCopyTextureSourceInternalFormatEnum(GLenum internalFormat)
{
    // Table 1.1 from the CHROMIUM_copy_texture spec
    switch (GetUnsizedFormat(internalFormat))
    {
        case GL_RED:
        case GL_ALPHA:
        case GL_LUMINANCE:
        case GL_LUMINANCE_ALPHA:
        case GL_RGB:
        case GL_RGBA:
        case GL_RGB8:
        case GL_RGBA8:
        case GL_BGRA_EXT:
        case GL_BGRA8_EXT:
            return true;

        default:
            return false;
    }
}

bool IsValidCopySubTextureSourceInternalFormat(GLenum internalFormat)
{
    return IsValidCopyTextureSourceInternalFormatEnum(internalFormat);
}

bool IsValidCopyTextureDestinationInternalFormatEnum(GLint internalFormat)
{
    // Table 1.0 from the CHROMIUM_copy_texture spec
    switch (internalFormat)
    {
        case GL_RGB:
        case GL_RGBA:
        case GL_RGB8:
        case GL_RGBA8:
        case GL_BGRA_EXT:
        case GL_BGRA8_EXT:
        case GL_SRGB_EXT:
        case GL_SRGB_ALPHA_EXT:
        case GL_R8:
        case GL_R8UI:
        case GL_RG8:
        case GL_RG8UI:
        case GL_SRGB8:
        case GL_RGB565:
        case GL_RGB8UI:
        case GL_RGB10_A2:
        case GL_SRGB8_ALPHA8:
        case GL_RGB5_A1:
        case GL_RGBA4:
        case GL_RGBA8UI:
        case GL_RGB9_E5:
        case GL_R16F:
        case GL_R32F:
        case GL_RG16F:
        case GL_RG32F:
        case GL_RGB16F:
        case GL_RGB32F:
        case GL_RGBA16F:
        case GL_RGBA32F:
        case GL_R11F_G11F_B10F:
        case GL_LUMINANCE:
        case GL_LUMINANCE_ALPHA:
        case GL_ALPHA:
            return true;

        default:
            return false;
    }
}

bool IsValidCopySubTextureDestionationInternalFormat(GLenum internalFormat)
{
    return IsValidCopyTextureDestinationInternalFormatEnum(internalFormat);
}

bool IsValidCopyTextureDestinationFormatType(Context *context, GLint internalFormat, GLenum type)
{
    if (!IsValidCopyTextureDestinationInternalFormatEnum(internalFormat))
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidInternalFormat);
        return false;
    }

    if (!ValidES3FormatCombination(GetUnsizedFormat(internalFormat), type, internalFormat))
    {
        context->validationError(GL_INVALID_OPERATION, kMismatchedTypeAndFormat);
        return false;
    }

    const InternalFormat &internalFormatInfo = GetInternalFormatInfo(internalFormat, type);
    if (!internalFormatInfo.textureSupport(context->getClientVersion(), context->getExtensions()))
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidInternalFormat);
        return false;
    }

    return true;
}

bool IsValidCopyTextureDestinationTargetEnum(Context *context, TextureTarget target)
{
    switch (target)
    {
        case TextureTarget::_2D:
        case TextureTarget::CubeMapNegativeX:
        case TextureTarget::CubeMapNegativeY:
        case TextureTarget::CubeMapNegativeZ:
        case TextureTarget::CubeMapPositiveX:
        case TextureTarget::CubeMapPositiveY:
        case TextureTarget::CubeMapPositiveZ:
            return true;

        case TextureTarget::Rectangle:
            return context->getExtensions().textureRectangle;

        default:
            return false;
    }
}

bool IsValidCopyTextureDestinationTarget(Context *context,
                                         TextureType textureType,
                                         TextureTarget target)
{
    return TextureTargetToType(target) == textureType;
}

bool IsValidCopyTextureSourceTarget(Context *context, TextureType type)
{
    switch (type)
    {
        case TextureType::_2D:
            return true;
        case TextureType::Rectangle:
            return context->getExtensions().textureRectangle;
        case TextureType::External:
            return context->getExtensions().eglImageExternal;
        default:
            return false;
    }
}

bool IsValidCopyTextureSourceLevel(Context *context, TextureType type, GLint level)
{
    if (!ValidMipLevel(context, type, level))
    {
        return false;
    }

    if (level > 0 && context->getClientVersion() < ES_3_0)
    {
        return false;
    }

    return true;
}

bool IsValidCopyTextureDestinationLevel(Context *context,
                                        TextureType type,
                                        GLint level,
                                        GLsizei width,
                                        GLsizei height,
                                        bool isSubImage)
{
    if (!ValidMipLevel(context, type, level))
    {
        return false;
    }

    if (!ValidImageSizeParameters(context, type, level, width, height, 1, isSubImage))
    {
        return false;
    }

    const Caps &caps = context->getCaps();
    switch (type)
    {
        case TextureType::_2D:
            return static_cast<GLuint>(width) <= (caps.max2DTextureSize >> level) &&
                   static_cast<GLuint>(height) <= (caps.max2DTextureSize >> level);
        case TextureType::Rectangle:
            ASSERT(level == 0);
            return static_cast<GLuint>(width) <= (caps.max2DTextureSize >> level) &&
                   static_cast<GLuint>(height) <= (caps.max2DTextureSize >> level);

        case TextureType::CubeMap:
            return static_cast<GLuint>(width) <= (caps.maxCubeMapTextureSize >> level) &&
                   static_cast<GLuint>(height) <= (caps.maxCubeMapTextureSize >> level);
        default:
            return true;
    }
}

bool IsValidStencilFunc(GLenum func)
{
    switch (func)
    {
        case GL_NEVER:
        case GL_ALWAYS:
        case GL_LESS:
        case GL_LEQUAL:
        case GL_EQUAL:
        case GL_GEQUAL:
        case GL_GREATER:
        case GL_NOTEQUAL:
            return true;

        default:
            return false;
    }
}

bool IsValidStencilFace(GLenum face)
{
    switch (face)
    {
        case GL_FRONT:
        case GL_BACK:
        case GL_FRONT_AND_BACK:
            return true;

        default:
            return false;
    }
}

bool IsValidStencilOp(GLenum op)
{
    switch (op)
    {
        case GL_ZERO:
        case GL_KEEP:
        case GL_REPLACE:
        case GL_INCR:
        case GL_DECR:
        case GL_INVERT:
        case GL_INCR_WRAP:
        case GL_DECR_WRAP:
            return true;

        default:
            return false;
    }
}

bool ValidateES2CopyTexImageParameters(Context *context,
                                       TextureTarget target,
                                       GLint level,
                                       GLenum internalformat,
                                       bool isSubImage,
                                       GLint xoffset,
                                       GLint yoffset,
                                       GLint x,
                                       GLint y,
                                       GLsizei width,
                                       GLsizei height,
                                       GLint border)
{
    if (!ValidTexture2DDestinationTarget(context, target))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidTextureTarget);
        return false;
    }

    TextureType texType = TextureTargetToType(target);
    if (!ValidImageSizeParameters(context, texType, level, width, height, 1, isSubImage))
    {
        // Error is already handled.
        return false;
    }

    Format textureFormat = Format::Invalid();
    if (!ValidateCopyTexImageParametersBase(context, target, level, internalformat, isSubImage,
                                            xoffset, yoffset, 0, x, y, width, height, border,
                                            &textureFormat))
    {
        return false;
    }

    const gl::Framebuffer *framebuffer = context->getState().getReadFramebuffer();
    GLenum colorbufferFormat =
        framebuffer->getReadColorbuffer()->getFormat().info->sizedInternalFormat;
    const auto &formatInfo = *textureFormat.info;

    // [OpenGL ES 2.0.24] table 3.9
    if (isSubImage)
    {
        switch (formatInfo.format)
        {
            case GL_ALPHA:
                if (colorbufferFormat != GL_ALPHA8_EXT && colorbufferFormat != GL_RGBA4 &&
                    colorbufferFormat != GL_RGB5_A1 && colorbufferFormat != GL_RGBA8_OES &&
                    colorbufferFormat != GL_BGRA8_EXT && colorbufferFormat != GL_BGR5_A1_ANGLEX)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                break;
            case GL_LUMINANCE:
                if (colorbufferFormat != GL_R8_EXT && colorbufferFormat != GL_RG8_EXT &&
                    colorbufferFormat != GL_RGB565 && colorbufferFormat != GL_RGB8_OES &&
                    colorbufferFormat != GL_RGBA4 && colorbufferFormat != GL_RGB5_A1 &&
                    colorbufferFormat != GL_RGBA8_OES && colorbufferFormat != GL_BGRA8_EXT &&
                    colorbufferFormat != GL_BGR5_A1_ANGLEX)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                break;
            case GL_RED_EXT:
                if (colorbufferFormat != GL_R8_EXT && colorbufferFormat != GL_RG8_EXT &&
                    colorbufferFormat != GL_RGB565 && colorbufferFormat != GL_RGB8_OES &&
                    colorbufferFormat != GL_RGBA4 && colorbufferFormat != GL_RGB5_A1 &&
                    colorbufferFormat != GL_RGBA8_OES && colorbufferFormat != GL_R32F &&
                    colorbufferFormat != GL_RG32F && colorbufferFormat != GL_RGB32F &&
                    colorbufferFormat != GL_RGBA32F && colorbufferFormat != GL_BGRA8_EXT &&
                    colorbufferFormat != GL_BGR5_A1_ANGLEX)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                break;
            case GL_RG_EXT:
                if (colorbufferFormat != GL_RG8_EXT && colorbufferFormat != GL_RGB565 &&
                    colorbufferFormat != GL_RGB8_OES && colorbufferFormat != GL_RGBA4 &&
                    colorbufferFormat != GL_RGB5_A1 && colorbufferFormat != GL_RGBA8_OES &&
                    colorbufferFormat != GL_RG32F && colorbufferFormat != GL_RGB32F &&
                    colorbufferFormat != GL_RGBA32F && colorbufferFormat != GL_BGRA8_EXT &&
                    colorbufferFormat != GL_BGR5_A1_ANGLEX)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                break;
            case GL_RGB:
                if (colorbufferFormat != GL_RGB565 && colorbufferFormat != GL_RGB8_OES &&
                    colorbufferFormat != GL_RGBA4 && colorbufferFormat != GL_RGB5_A1 &&
                    colorbufferFormat != GL_RGBA8_OES && colorbufferFormat != GL_RGB32F &&
                    colorbufferFormat != GL_RGBA32F && colorbufferFormat != GL_BGRA8_EXT &&
                    colorbufferFormat != GL_BGR5_A1_ANGLEX)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                break;
            case GL_LUMINANCE_ALPHA:
            case GL_RGBA:
                if (colorbufferFormat != GL_RGBA4 && colorbufferFormat != GL_RGB5_A1 &&
                    colorbufferFormat != GL_RGBA8_OES && colorbufferFormat != GL_RGBA32F &&
                    colorbufferFormat != GL_BGRA8_EXT && colorbufferFormat != GL_BGR5_A1_ANGLEX)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                break;
            case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
            case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
            case GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE:
            case GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE:
            case GL_ETC1_RGB8_OES:
            case GL_ETC1_RGB8_LOSSY_DECODE_ANGLE:
            case GL_COMPRESSED_RGB8_LOSSY_DECODE_ETC2_ANGLE:
            case GL_COMPRESSED_SRGB8_LOSSY_DECODE_ETC2_ANGLE:
            case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_LOSSY_DECODE_ETC2_ANGLE:
            case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_LOSSY_DECODE_ETC2_ANGLE:
            case GL_COMPRESSED_RGBA_BPTC_UNORM_EXT:
            case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT:
            case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_EXT:
            case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_EXT:
                context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                return false;
            case GL_DEPTH_COMPONENT:
            case GL_DEPTH_STENCIL_OES:
                context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                return false;
            default:
                context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                return false;
        }

        if (formatInfo.type == GL_FLOAT && !context->getExtensions().textureFloat)
        {
            context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
            return false;
        }
    }
    else
    {
        switch (internalformat)
        {
            case GL_ALPHA:
                if (colorbufferFormat != GL_ALPHA8_EXT && colorbufferFormat != GL_RGBA4 &&
                    colorbufferFormat != GL_RGB5_A1 && colorbufferFormat != GL_BGRA8_EXT &&
                    colorbufferFormat != GL_RGBA8_OES && colorbufferFormat != GL_BGR5_A1_ANGLEX)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                break;
            case GL_LUMINANCE:
                if (colorbufferFormat != GL_R8_EXT && colorbufferFormat != GL_RG8_EXT &&
                    colorbufferFormat != GL_RGB565 && colorbufferFormat != GL_RGB8_OES &&
                    colorbufferFormat != GL_RGBA4 && colorbufferFormat != GL_RGB5_A1 &&
                    colorbufferFormat != GL_BGRA8_EXT && colorbufferFormat != GL_RGBA8_OES &&
                    colorbufferFormat != GL_BGR5_A1_ANGLEX)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                break;
            case GL_RED_EXT:
                if (colorbufferFormat != GL_R8_EXT && colorbufferFormat != GL_RG8_EXT &&
                    colorbufferFormat != GL_RGB565 && colorbufferFormat != GL_RGB8_OES &&
                    colorbufferFormat != GL_RGBA4 && colorbufferFormat != GL_RGB5_A1 &&
                    colorbufferFormat != GL_BGRA8_EXT && colorbufferFormat != GL_RGBA8_OES &&
                    colorbufferFormat != GL_BGR5_A1_ANGLEX)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                break;
            case GL_RG_EXT:
                if (colorbufferFormat != GL_RG8_EXT && colorbufferFormat != GL_RGB565 &&
                    colorbufferFormat != GL_RGB8_OES && colorbufferFormat != GL_RGBA4 &&
                    colorbufferFormat != GL_RGB5_A1 && colorbufferFormat != GL_BGRA8_EXT &&
                    colorbufferFormat != GL_RGBA8_OES && colorbufferFormat != GL_BGR5_A1_ANGLEX)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                break;
            case GL_RGB:
                if (colorbufferFormat != GL_RGB565 && colorbufferFormat != GL_RGB8_OES &&
                    colorbufferFormat != GL_RGBA4 && colorbufferFormat != GL_RGB5_A1 &&
                    colorbufferFormat != GL_BGRA8_EXT && colorbufferFormat != GL_RGBA8_OES &&
                    colorbufferFormat != GL_BGR5_A1_ANGLEX)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                break;
            case GL_LUMINANCE_ALPHA:
            case GL_RGBA:
                if (colorbufferFormat != GL_RGBA4 && colorbufferFormat != GL_RGB5_A1 &&
                    colorbufferFormat != GL_BGRA8_EXT && colorbufferFormat != GL_RGBA8_OES &&
                    colorbufferFormat != GL_BGR5_A1_ANGLEX)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                break;
            case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
            case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
                if (context->getExtensions().textureCompressionDXT1)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                else
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                break;
            case GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE:
                if (context->getExtensions().textureCompressionDXT3)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                else
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                break;
            case GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE:
                if (context->getExtensions().textureCompressionDXT5)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                else
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                break;
            case GL_ETC1_RGB8_OES:
                if (context->getExtensions().compressedETC1RGB8Texture)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                else
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                break;
            case GL_ETC1_RGB8_LOSSY_DECODE_ANGLE:
            case GL_COMPRESSED_RGB8_LOSSY_DECODE_ETC2_ANGLE:
            case GL_COMPRESSED_SRGB8_LOSSY_DECODE_ETC2_ANGLE:
            case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_LOSSY_DECODE_ETC2_ANGLE:
            case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_LOSSY_DECODE_ETC2_ANGLE:
                if (context->getExtensions().lossyETCDecode)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                else
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                break;
            case GL_DEPTH_COMPONENT:
            case GL_DEPTH_COMPONENT16:
            case GL_DEPTH_COMPONENT32_OES:
                if (context->getExtensions().depthTextureAny())
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                else
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                break;
            case GL_DEPTH_STENCIL_OES:
            case GL_DEPTH24_STENCIL8_OES:
                if (context->getExtensions().depthTextureAny() ||
                    context->getExtensions().packedDepthStencil)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                else
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                break;
            default:
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
        }
    }

    // If width or height is zero, it is a no-op.  Return false without setting an error.
    return (width > 0 && height > 0);
}

bool ValidCap(const Context *context, GLenum cap, bool queryOnly)
{
    switch (cap)
    {
        // EXT_multisample_compatibility
        case GL_MULTISAMPLE_EXT:
        case GL_SAMPLE_ALPHA_TO_ONE_EXT:
            return context->getExtensions().multisampleCompatibility;

        case GL_CULL_FACE:
        case GL_POLYGON_OFFSET_FILL:
        case GL_SAMPLE_ALPHA_TO_COVERAGE:
        case GL_SAMPLE_COVERAGE:
        case GL_SCISSOR_TEST:
        case GL_STENCIL_TEST:
        case GL_DEPTH_TEST:
        case GL_BLEND:
        case GL_DITHER:
            return true;

        case GL_PRIMITIVE_RESTART_FIXED_INDEX:
        case GL_RASTERIZER_DISCARD:
            return (context->getClientMajorVersion() >= 3);

        case GL_DEBUG_OUTPUT_SYNCHRONOUS:
        case GL_DEBUG_OUTPUT:
            return context->getExtensions().debug;

        case GL_BIND_GENERATES_RESOURCE_CHROMIUM:
            return queryOnly && context->getExtensions().bindGeneratesResource;

        case GL_CLIENT_ARRAYS_ANGLE:
            return queryOnly && context->getExtensions().clientArrays;

        case GL_FRAMEBUFFER_SRGB_EXT:
            return context->getExtensions().sRGBWriteControl;

        case GL_SAMPLE_MASK:
            return context->getClientVersion() >= Version(3, 1);

        case GL_ROBUST_RESOURCE_INITIALIZATION_ANGLE:
            return queryOnly && context->getExtensions().robustResourceInitialization;

        // GLES1 emulation: GLES1-specific caps
        case GL_ALPHA_TEST:
        case GL_VERTEX_ARRAY:
        case GL_NORMAL_ARRAY:
        case GL_COLOR_ARRAY:
        case GL_TEXTURE_COORD_ARRAY:
        case GL_TEXTURE_2D:
        case GL_LIGHTING:
        case GL_LIGHT0:
        case GL_LIGHT1:
        case GL_LIGHT2:
        case GL_LIGHT3:
        case GL_LIGHT4:
        case GL_LIGHT5:
        case GL_LIGHT6:
        case GL_LIGHT7:
        case GL_NORMALIZE:
        case GL_RESCALE_NORMAL:
        case GL_COLOR_MATERIAL:
        case GL_CLIP_PLANE0:
        case GL_CLIP_PLANE1:
        case GL_CLIP_PLANE2:
        case GL_CLIP_PLANE3:
        case GL_CLIP_PLANE4:
        case GL_CLIP_PLANE5:
        case GL_FOG:
        case GL_POINT_SMOOTH:
        case GL_LINE_SMOOTH:
        case GL_COLOR_LOGIC_OP:
            return context->getClientVersion() < Version(2, 0);
        case GL_POINT_SIZE_ARRAY_OES:
            return context->getClientVersion() < Version(2, 0) &&
                   context->getExtensions().pointSizeArray;
        case GL_TEXTURE_CUBE_MAP:
            return context->getClientVersion() < Version(2, 0) &&
                   context->getExtensions().textureCubeMap;
        case GL_POINT_SPRITE_OES:
            return context->getClientVersion() < Version(2, 0) &&
                   context->getExtensions().pointSprite;
        default:
            return false;
    }
}

// Return true if a character belongs to the ASCII subset as defined in GLSL ES 1.0 spec section
// 3.1.
bool IsValidESSLCharacter(unsigned char c)
{
    // Printing characters are valid except " $ ` @ \ ' DEL.
    if (c >= 32 && c <= 126 && c != '"' && c != '$' && c != '`' && c != '@' && c != '\\' &&
        c != '\'')
    {
        return true;
    }

    // Horizontal tab, line feed, vertical tab, form feed, carriage return are also valid.
    if (c >= 9 && c <= 13)
    {
        return true;
    }

    return false;
}

bool IsValidESSLString(const char *str, size_t len)
{
    for (size_t i = 0; i < len; i++)
    {
        if (!IsValidESSLCharacter(str[i]))
        {
            return false;
        }
    }

    return true;
}

bool IsValidESSLShaderSourceString(const char *str, size_t len, bool lineContinuationAllowed)
{
    enum class ParseState
    {
        // Have not seen an ASCII non-whitespace character yet on
        // this line. Possible that we might see a preprocessor
        // directive.
        BEGINING_OF_LINE,

        // Have seen at least one ASCII non-whitespace character
        // on this line.
        MIDDLE_OF_LINE,

        // Handling a preprocessor directive. Passes through all
        // characters up to the end of the line. Disables comment
        // processing.
        IN_PREPROCESSOR_DIRECTIVE,

        // Handling a single-line comment. The comment text is
        // replaced with a single space.
        IN_SINGLE_LINE_COMMENT,

        // Handling a multi-line comment. Newlines are passed
        // through to preserve line numbers.
        IN_MULTI_LINE_COMMENT
    };

    ParseState state = ParseState::BEGINING_OF_LINE;
    size_t pos       = 0;

    while (pos < len)
    {
        char c    = str[pos];
        char next = pos + 1 < len ? str[pos + 1] : 0;

        // Check for newlines
        if (c == '\n' || c == '\r')
        {
            if (state != ParseState::IN_MULTI_LINE_COMMENT)
            {
                state = ParseState::BEGINING_OF_LINE;
            }

            pos++;
            continue;
        }

        switch (state)
        {
            case ParseState::BEGINING_OF_LINE:
                if (c == ' ')
                {
                    // Maintain the BEGINING_OF_LINE state until a non-space is seen
                    pos++;
                }
                else if (c == '#')
                {
                    state = ParseState::IN_PREPROCESSOR_DIRECTIVE;
                    pos++;
                }
                else
                {
                    // Don't advance, re-process this character with the MIDDLE_OF_LINE state
                    state = ParseState::MIDDLE_OF_LINE;
                }
                break;

            case ParseState::MIDDLE_OF_LINE:
                if (c == '/' && next == '/')
                {
                    state = ParseState::IN_SINGLE_LINE_COMMENT;
                    pos++;
                }
                else if (c == '/' && next == '*')
                {
                    state = ParseState::IN_MULTI_LINE_COMMENT;
                    pos++;
                }
                else if (lineContinuationAllowed && c == '\\' && (next == '\n' || next == '\r'))
                {
                    // Skip line continuation characters
                }
                else if (!IsValidESSLCharacter(c))
                {
                    return false;
                }
                pos++;
                break;

            case ParseState::IN_PREPROCESSOR_DIRECTIVE:
                // Line-continuation characters may not be permitted.
                // Otherwise, just pass it through. Do not parse comments in this state.
                if (!lineContinuationAllowed && c == '\\')
                {
                    return false;
                }
                pos++;
                break;

            case ParseState::IN_SINGLE_LINE_COMMENT:
                // Line-continuation characters are processed before comment processing.
                // Advance string if a new line character is immediately behind
                // line-continuation character.
                if (c == '\\' && (next == '\n' || next == '\r'))
                {
                    pos++;
                }
                pos++;
                break;

            case ParseState::IN_MULTI_LINE_COMMENT:
                if (c == '*' && next == '/')
                {
                    state = ParseState::MIDDLE_OF_LINE;
                    pos++;
                }
                pos++;
                break;
        }
    }

    return true;
}

bool ValidateWebGLNamePrefix(Context *context, const GLchar *name)
{
    ASSERT(context->isWebGL());

    // WebGL 1.0 [Section 6.16] GLSL Constructs
    // Identifiers starting with "webgl_" and "_webgl_" are reserved for use by WebGL.
    if (strncmp(name, "webgl_", 6) == 0 || strncmp(name, "_webgl_", 7) == 0)
    {
        context->validationError(GL_INVALID_OPERATION, kWebglBindAttribLocationReservedPrefix);
        return false;
    }

    return true;
}

bool ValidateWebGLNameLength(Context *context, size_t length)
{
    ASSERT(context->isWebGL());

    if (context->isWebGL1() && length > 256)
    {
        // WebGL 1.0 [Section 6.21] Maxmimum Uniform and Attribute Location Lengths
        // WebGL imposes a limit of 256 characters on the lengths of uniform and attribute
        // locations.
        context->validationError(GL_INVALID_VALUE, kWebglNameLengthLimitExceeded);

        return false;
    }
    else if (length > 1024)
    {
        // WebGL 2.0 [Section 4.3.2] WebGL 2.0 imposes a limit of 1024 characters on the lengths of
        // uniform and attribute locations.
        context->validationError(GL_INVALID_VALUE, kWebgl2NameLengthLimitExceeded);
        return false;
    }

    return true;
}

bool ValidateMatrixMode(Context *context, GLenum matrixMode)
{
    if (!context->getExtensions().pathRendering)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (matrixMode != GL_PATH_MODELVIEW_CHROMIUM && matrixMode != GL_PATH_PROJECTION_CHROMIUM)
    {
        context->validationError(GL_INVALID_ENUM, kInvalidMatrixMode);
        return false;
    }
    return true;
}

bool ValidBlendFunc(const Context *context, GLenum val)
{
    const gl::Extensions &ext = context->getExtensions();

    // these are always valid for src and dst.
    switch (val)
    {
        case GL_ZERO:
        case GL_ONE:
        case GL_SRC_COLOR:
        case GL_ONE_MINUS_SRC_COLOR:
        case GL_DST_COLOR:
        case GL_ONE_MINUS_DST_COLOR:
        case GL_SRC_ALPHA:
        case GL_ONE_MINUS_SRC_ALPHA:
        case GL_DST_ALPHA:
        case GL_ONE_MINUS_DST_ALPHA:
        case GL_CONSTANT_COLOR:
        case GL_ONE_MINUS_CONSTANT_COLOR:
        case GL_CONSTANT_ALPHA:
        case GL_ONE_MINUS_CONSTANT_ALPHA:
            return true;

        // EXT_blend_func_extended.
        case GL_SRC1_COLOR_EXT:
        case GL_SRC1_ALPHA_EXT:
        case GL_ONE_MINUS_SRC1_COLOR_EXT:
        case GL_ONE_MINUS_SRC1_ALPHA_EXT:
        case GL_SRC_ALPHA_SATURATE_EXT:
            return ext.blendFuncExtended;

        default:
            return false;
    }
}

bool ValidSrcBlendFunc(const Context *context, GLenum val)
{
    if (ValidBlendFunc(context, val))
        return true;

    if (val == GL_SRC_ALPHA_SATURATE)
        return true;

    return false;
}

bool ValidDstBlendFunc(const Context *context, GLenum val)
{
    if (ValidBlendFunc(context, val))
        return true;

    if (val == GL_SRC_ALPHA_SATURATE)
    {
        if (context->getClientMajorVersion() >= 3)
            return true;
    }

    return false;
}

bool IsValidImageLayout(ImageLayout layout)
{
    switch (layout)
    {
        case ImageLayout::General:
        case ImageLayout::ColorAttachment:
        case ImageLayout::DepthStencilAttachment:
        case ImageLayout::DepthStencilReadOnlyAttachment:
        case ImageLayout::ShaderReadOnly:
        case ImageLayout::TransferSrc:
        case ImageLayout::TransferDst:
        case ImageLayout::DepthReadOnlyStencilAttachment:
        case ImageLayout::DepthAttachmentStencilReadOnly:
            return true;

        default:
            return false;
    }
}

}  // anonymous namespace

bool ValidateES2TexImageParameters(Context *context,
                                   TextureTarget target,
                                   GLint level,
                                   GLenum internalformat,
                                   bool isCompressed,
                                   bool isSubImage,
                                   GLint xoffset,
                                   GLint yoffset,
                                   GLsizei width,
                                   GLsizei height,
                                   GLint border,
                                   GLenum format,
                                   GLenum type,
                                   GLsizei imageSize,
                                   const void *pixels)
{
    if (!ValidTexture2DDestinationTarget(context, target))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidTextureTarget);
        return false;
    }

    TextureType texType = TextureTargetToType(target);
    if (!ValidImageSizeParameters(context, texType, level, width, height, 1, isSubImage))
    {
        // Error already handled.
        return false;
    }

    if (!ValidMipLevel(context, texType, level))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidMipLevel);
        return false;
    }

    if (xoffset < 0 || std::numeric_limits<GLsizei>::max() - xoffset < width ||
        std::numeric_limits<GLsizei>::max() - yoffset < height)
    {
        context->validationError(GL_INVALID_VALUE, kResourceMaxTextureSize);
        return false;
    }

    const gl::Caps &caps = context->getCaps();

    switch (texType)
    {
        case TextureType::_2D:
            if (static_cast<GLuint>(width) > (caps.max2DTextureSize >> level) ||
                static_cast<GLuint>(height) > (caps.max2DTextureSize >> level))
            {
                context->validationError(GL_INVALID_VALUE, kResourceMaxTextureSize);
                return false;
            }
            break;

        case TextureType::Rectangle:
            ASSERT(level == 0);
            if (static_cast<GLuint>(width) > caps.maxRectangleTextureSize ||
                static_cast<GLuint>(height) > caps.maxRectangleTextureSize)
            {
                context->validationError(GL_INVALID_VALUE, kResourceMaxTextureSize);
                return false;
            }
            if (isCompressed)
            {
                context->validationError(GL_INVALID_ENUM, kRectangleTextureCompressed);
                return false;
            }
            break;

        case TextureType::CubeMap:
            if (!isSubImage && width != height)
            {
                context->validationError(GL_INVALID_VALUE, kCubemapFacesEqualDimensions);
                return false;
            }

            if (static_cast<GLuint>(width) > (caps.maxCubeMapTextureSize >> level) ||
                static_cast<GLuint>(height) > (caps.maxCubeMapTextureSize >> level))
            {
                context->validationError(GL_INVALID_VALUE, kResourceMaxTextureSize);
                return false;
            }
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kInvalidTextureTarget);
            return false;
    }

    gl::Texture *texture = context->getTextureByType(texType);
    if (!texture)
    {
        context->validationError(GL_INVALID_OPERATION, kBufferNotBound);
        return false;
    }

    // Verify zero border
    if (border != 0)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidBorder);
        return false;
    }

    bool nonEqualFormatsAllowed = false;

    if (isCompressed)
    {
        GLenum actualInternalFormat =
            isSubImage ? texture->getFormat(target, level).info->sizedInternalFormat
                       : internalformat;

        const InternalFormat &internalFormatInfo = GetSizedInternalFormatInfo(actualInternalFormat);

        if (!internalFormatInfo.compressed)
        {
            context->validationError(GL_INVALID_ENUM, kInvalidInternalFormat);
            return false;
        }

        if (!internalFormatInfo.textureSupport(context->getClientVersion(),
                                               context->getExtensions()))
        {
            context->validationError(GL_INVALID_ENUM, kInvalidInternalFormat);
            return false;
        }

        if (isSubImage)
        {
            // From the OES_compressed_ETC1_RGB8_texture spec:
            // INVALID_OPERATION is generated by CompressedTexSubImage2D, TexSubImage2D, or
            // CopyTexSubImage2D if the texture image <level> bound to <target> has internal format
            // ETC1_RGB8_OES.
            if (actualInternalFormat == GL_ETC1_RGB8_OES)
            {
                context->validationError(GL_INVALID_OPERATION, kInvalidInternalFormat);
                return false;
            }

            if (!ValidCompressedSubImageSize(context, actualInternalFormat, xoffset, yoffset, width,
                                             height, texture->getWidth(target, level),
                                             texture->getHeight(target, level)))
            {
                context->validationError(GL_INVALID_OPERATION, kInvalidCompressedImageSize);
                return false;
            }

            if (format != actualInternalFormat)
            {
                context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                return false;
            }
        }
        else
        {
            if (!ValidCompressedImageSize(context, actualInternalFormat, level, width, height))
            {
                context->validationError(GL_INVALID_OPERATION, kInvalidCompressedImageSize);
                return false;
            }
        }
    }
    else
    {
        // validate <type> by itself (used as secondary key below)
        switch (type)
        {
            case GL_UNSIGNED_BYTE:
            case GL_UNSIGNED_SHORT_5_6_5:
            case GL_UNSIGNED_SHORT_4_4_4_4:
            case GL_UNSIGNED_SHORT_5_5_5_1:
            case GL_UNSIGNED_SHORT:
            case GL_UNSIGNED_INT:
            case GL_UNSIGNED_INT_24_8_OES:
            case GL_HALF_FLOAT_OES:
            case GL_FLOAT:
                break;
            default:
                context->validationError(GL_INVALID_ENUM, kInvalidType);
                return false;
        }

        // validate <format> + <type> combinations
        // - invalid <format> -> sets INVALID_ENUM
        // - invalid <format>+<type> combination -> sets INVALID_OPERATION
        switch (format)
        {
            case GL_ALPHA:
            case GL_LUMINANCE:
            case GL_LUMINANCE_ALPHA:
                switch (type)
                {
                    case GL_UNSIGNED_BYTE:
                    case GL_FLOAT:
                    case GL_HALF_FLOAT_OES:
                        break;
                    default:
                        context->validationError(GL_INVALID_OPERATION, kMismatchedTypeAndFormat);
                        return false;
                }
                break;
            case GL_RED:
            case GL_RG:
                if (!context->getExtensions().textureRG)
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                switch (type)
                {
                    case GL_UNSIGNED_BYTE:
                        break;
                    case GL_FLOAT:
                    case GL_HALF_FLOAT_OES:
                        if (!context->getExtensions().textureFloat)
                        {
                            context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                            return false;
                        }
                        break;
                    default:
                        context->validationError(GL_INVALID_OPERATION, kMismatchedTypeAndFormat);
                        return false;
                }
                break;
            case GL_RGB:
                switch (type)
                {
                    case GL_UNSIGNED_BYTE:
                    case GL_UNSIGNED_SHORT_5_6_5:
                    case GL_FLOAT:
                    case GL_HALF_FLOAT_OES:
                        break;
                    default:
                        context->validationError(GL_INVALID_OPERATION, kMismatchedTypeAndFormat);
                        return false;
                }
                break;
            case GL_RGBA:
                switch (type)
                {
                    case GL_UNSIGNED_BYTE:
                    case GL_UNSIGNED_SHORT_4_4_4_4:
                    case GL_UNSIGNED_SHORT_5_5_5_1:
                    case GL_FLOAT:
                    case GL_HALF_FLOAT_OES:
                        break;
                    default:
                        context->validationError(GL_INVALID_OPERATION, kMismatchedTypeAndFormat);
                        return false;
                }
                break;
            case GL_BGRA_EXT:
                if (!context->getExtensions().textureFormatBGRA8888)
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                switch (type)
                {
                    case GL_UNSIGNED_BYTE:
                        break;
                    default:
                        context->validationError(GL_INVALID_OPERATION, kMismatchedTypeAndFormat);
                        return false;
                }
                break;
            case GL_SRGB_EXT:
            case GL_SRGB_ALPHA_EXT:
                if (!context->getExtensions().sRGB)
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                switch (type)
                {
                    case GL_UNSIGNED_BYTE:
                        break;
                    default:
                        context->validationError(GL_INVALID_OPERATION, kMismatchedTypeAndFormat);
                        return false;
                }
                break;
            case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:  // error cases for compressed textures are
                                                   // handled below
            case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
            case GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE:
            case GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE:
                break;
            case GL_DEPTH_COMPONENT:
                switch (type)
                {
                    case GL_UNSIGNED_SHORT:
                    case GL_UNSIGNED_INT:
                        break;
                    default:
                        context->validationError(GL_INVALID_OPERATION, kMismatchedTypeAndFormat);
                        return false;
                }
                break;
            case GL_DEPTH_STENCIL_OES:
                switch (type)
                {
                    case GL_UNSIGNED_INT_24_8_OES:
                        break;
                    default:
                        context->validationError(GL_INVALID_OPERATION, kMismatchedTypeAndFormat);
                        return false;
                }
                break;
            default:
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
        }

        switch (format)
        {
            case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
            case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
                if (context->getExtensions().textureCompressionDXT1)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                else
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                break;
            case GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE:
                if (context->getExtensions().textureCompressionDXT3)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                else
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                break;
            case GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE:
                if (context->getExtensions().textureCompressionDXT5)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                else
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                break;
            case GL_ETC1_RGB8_OES:
                if (context->getExtensions().compressedETC1RGB8Texture)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                else
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                break;
            case GL_ETC1_RGB8_LOSSY_DECODE_ANGLE:
            case GL_COMPRESSED_RGB8_LOSSY_DECODE_ETC2_ANGLE:
            case GL_COMPRESSED_SRGB8_LOSSY_DECODE_ETC2_ANGLE:
            case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_LOSSY_DECODE_ETC2_ANGLE:
            case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_LOSSY_DECODE_ETC2_ANGLE:
                if (context->getExtensions().lossyETCDecode)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidFormat);
                    return false;
                }
                else
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                break;
            case GL_DEPTH_COMPONENT:
            case GL_DEPTH_STENCIL_OES:
                if (!context->getExtensions().depthTextureANGLE &&
                    !(context->getExtensions().packedDepthStencil &&
                      context->getExtensions().depthTextureOES))
                {
                    context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                    return false;
                }
                if (target != TextureTarget::_2D)
                {
                    context->validationError(GL_INVALID_OPERATION, kMismatchedTargetAndFormat);
                    return false;
                }
                // OES_depth_texture supports loading depth data and multiple levels,
                // but ANGLE_depth_texture does not
                if (!context->getExtensions().depthTextureOES)
                {
                    if (pixels != nullptr)
                    {
                        context->validationError(GL_INVALID_OPERATION, kPixelDataNotNull);
                        return false;
                    }
                    if (level != 0)
                    {
                        context->validationError(GL_INVALID_OPERATION, kLevelNotZero);
                        return false;
                    }
                }
                break;
            default:
                break;
        }

        if (!isSubImage)
        {
            switch (internalformat)
            {
                // Core ES 2.0 formats
                case GL_ALPHA:
                case GL_LUMINANCE:
                case GL_LUMINANCE_ALPHA:
                case GL_RGB:
                case GL_RGBA:
                    break;

                case GL_RGBA32F:
                    if (!context->getExtensions().colorBufferFloatRGBA)
                    {
                        context->validationError(GL_INVALID_ENUM, kInvalidFormat);
                        return false;
                    }

                    nonEqualFormatsAllowed = true;

                    if (type != GL_FLOAT)
                    {
                        context->validationError(GL_INVALID_OPERATION, kMismatchedTypeAndFormat);
                        return false;
                    }
                    if (format != GL_RGBA)
                    {
                        context->validationError(GL_INVALID_OPERATION, kMismatchedTypeAndFormat);
                        return false;
                    }
                    break;

                case GL_RGB32F:
                    if (!context->getExtensions().colorBufferFloatRGB)
                    {
                        context->validationError(GL_INVALID_ENUM, kInvalidFormat);
                        return false;
                    }

                    nonEqualFormatsAllowed = true;

                    if (type != GL_FLOAT)
                    {
                        context->validationError(GL_INVALID_OPERATION, kMismatchedTypeAndFormat);
                        return false;
                    }
                    if (format != GL_RGB)
                    {
                        context->validationError(GL_INVALID_OPERATION, kMismatchedTypeAndFormat);
                        return false;
                    }
                    break;

                case GL_BGRA_EXT:
                    if (!context->getExtensions().textureFormatBGRA8888)
                    {
                        context->validationError(GL_INVALID_ENUM, kInvalidFormat);
                        return false;
                    }
                    break;

                case GL_DEPTH_COMPONENT:
                    if (!(context->getExtensions().depthTextureAny()))
                    {
                        context->validationError(GL_INVALID_ENUM, kInvalidFormat);
                        return false;
                    }
                    break;

                case GL_DEPTH_STENCIL:
                    if (!(context->getExtensions().depthTextureANGLE ||
                          context->getExtensions().packedDepthStencil))
                    {
                        context->validationError(GL_INVALID_ENUM, kInvalidFormat);
                        return false;
                    }
                    break;

                case GL_RED:
                case GL_RG:
                    if (!context->getExtensions().textureRG)
                    {
                        context->validationError(GL_INVALID_ENUM, kInvalidFormat);
                        return false;
                    }
                    break;

                case GL_SRGB_EXT:
                case GL_SRGB_ALPHA_EXT:
                    if (!context->getExtensions().sRGB)
                    {
                        context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                        return false;
                    }
                    break;

                default:
                    context->validationError(GL_INVALID_VALUE, kInvalidInternalFormat);
                    return false;
            }
        }

        if (type == GL_FLOAT)
        {
            if (!context->getExtensions().textureFloat)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
        }
        else if (type == GL_HALF_FLOAT_OES)
        {
            if (!context->getExtensions().textureHalfFloat)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
        }
    }

    if (isSubImage)
    {
        const InternalFormat &textureInternalFormat = *texture->getFormat(target, level).info;
        if (textureInternalFormat.internalFormat == GL_NONE)
        {
            context->validationError(GL_INVALID_OPERATION, kInvalidTextureLevel);
            return false;
        }

        if (format != textureInternalFormat.format)
        {
            context->validationError(GL_INVALID_OPERATION, err::kTextureFormatMismatch);
            return false;
        }

        if (context->getExtensions().webglCompatibility)
        {
            if (GetInternalFormatInfo(format, type).sizedInternalFormat !=
                textureInternalFormat.sizedInternalFormat)
            {
                context->validationError(GL_INVALID_OPERATION, kTextureTypeMismatch);
                return false;
            }
        }

        if (static_cast<size_t>(xoffset + width) > texture->getWidth(target, level) ||
            static_cast<size_t>(yoffset + height) > texture->getHeight(target, level))
        {
            context->validationError(GL_INVALID_VALUE, kOffsetOverflow);
            return false;
        }

        if (width > 0 && height > 0 && pixels == nullptr &&
            context->getState().getTargetBuffer(BufferBinding::PixelUnpack) == nullptr)
        {
            context->validationError(GL_INVALID_VALUE, kPixelDataNull);
            return false;
        }
    }
    else
    {
        if (texture->getImmutableFormat())
        {
            context->validationError(GL_INVALID_OPERATION, kTextureIsImmutable);
            return false;
        }
    }

    // From GL_CHROMIUM_color_buffer_float_rgb[a]:
    // GL_RGB[A] / GL_RGB[A]32F becomes an allowable format / internalformat parameter pair for
    // TexImage2D. The restriction in section 3.7.1 of the OpenGL ES 2.0 spec that the
    // internalformat parameter and format parameter of TexImage2D must match is lifted for this
    // case.
    if (!isSubImage && !isCompressed && internalformat != format && !nonEqualFormatsAllowed)
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidFormatCombination);
        return false;
    }

    GLenum sizeCheckFormat = isSubImage ? format : internalformat;
    return ValidImageDataSize(context, texType, width, height, 1, sizeCheckFormat, type, pixels,
                              imageSize);
}

bool ValidateES2TexStorageParameters(Context *context,
                                     TextureType target,
                                     GLsizei levels,
                                     GLenum internalformat,
                                     GLsizei width,
                                     GLsizei height)
{
    if (target != TextureType::_2D && target != TextureType::CubeMap &&
        target != TextureType::Rectangle)
    {
        context->validationError(GL_INVALID_ENUM, kInvalidTextureTarget);
        return false;
    }

    if (width < 1 || height < 1 || levels < 1)
    {
        context->validationError(GL_INVALID_VALUE, kTextureSizeTooSmall);
        return false;
    }

    if (target == TextureType::CubeMap && width != height)
    {
        context->validationError(GL_INVALID_VALUE, kCubemapFacesEqualDimensions);
        return false;
    }

    if (levels != 1 && levels != gl::log2(std::max(width, height)) + 1)
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidMipLevels);
        return false;
    }

    const gl::InternalFormat &formatInfo = gl::GetSizedInternalFormatInfo(internalformat);
    if (formatInfo.format == GL_NONE || formatInfo.type == GL_NONE)
    {
        context->validationError(GL_INVALID_ENUM, kInvalidFormat);
        return false;
    }

    const gl::Caps &caps = context->getCaps();

    switch (target)
    {
        case TextureType::_2D:
            if (static_cast<GLuint>(width) > caps.max2DTextureSize ||
                static_cast<GLuint>(height) > caps.max2DTextureSize)
            {
                context->validationError(GL_INVALID_VALUE, kResourceMaxTextureSize);
                return false;
            }
            break;
        case TextureType::Rectangle:
            if (levels != 1)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidMipLevel);
                return false;
            }

            if (static_cast<GLuint>(width) > caps.maxRectangleTextureSize ||
                static_cast<GLuint>(height) > caps.maxRectangleTextureSize)
            {
                context->validationError(GL_INVALID_VALUE, kResourceMaxTextureSize);
                return false;
            }
            if (formatInfo.compressed)
            {
                context->validationError(GL_INVALID_ENUM, kRectangleTextureCompressed);
                return false;
            }
            break;
        case TextureType::CubeMap:
            if (static_cast<GLuint>(width) > caps.maxCubeMapTextureSize ||
                static_cast<GLuint>(height) > caps.maxCubeMapTextureSize)
            {
                context->validationError(GL_INVALID_VALUE, kResourceMaxTextureSize);
                return false;
            }
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
            return false;
    }

    if (levels != 1 && !context->getExtensions().textureNPOT)
    {
        if (!gl::isPow2(width) || !gl::isPow2(height))
        {
            context->validationError(GL_INVALID_OPERATION, kDimensionsMustBePow2);
            return false;
        }
    }

    switch (internalformat)
    {
        case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
        case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
            if (!context->getExtensions().textureCompressionDXT1)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
            break;
        case GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE:
            if (!context->getExtensions().textureCompressionDXT3)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
            break;
        case GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE:
            if (!context->getExtensions().textureCompressionDXT5)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
            break;
        case GL_ETC1_RGB8_OES:
            if (!context->getExtensions().compressedETC1RGB8Texture)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
            break;
        case GL_ETC1_RGB8_LOSSY_DECODE_ANGLE:
        case GL_COMPRESSED_RGB8_LOSSY_DECODE_ETC2_ANGLE:
        case GL_COMPRESSED_SRGB8_LOSSY_DECODE_ETC2_ANGLE:
        case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_LOSSY_DECODE_ETC2_ANGLE:
        case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_LOSSY_DECODE_ETC2_ANGLE:
            if (!context->getExtensions().lossyETCDecode)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
            break;
        case GL_RGBA32F_EXT:
        case GL_RGB32F_EXT:
        case GL_ALPHA32F_EXT:
        case GL_LUMINANCE32F_EXT:
        case GL_LUMINANCE_ALPHA32F_EXT:
            if (!context->getExtensions().textureFloat)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
            break;
        case GL_RGBA16F_EXT:
        case GL_RGB16F_EXT:
        case GL_ALPHA16F_EXT:
        case GL_LUMINANCE16F_EXT:
        case GL_LUMINANCE_ALPHA16F_EXT:
            if (!context->getExtensions().textureHalfFloat)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
            break;
        case GL_R8_EXT:
        case GL_RG8_EXT:
            if (!context->getExtensions().textureRG)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
            break;
        case GL_R16F_EXT:
        case GL_RG16F_EXT:
            if (!context->getExtensions().textureRG || !context->getExtensions().textureHalfFloat)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
            break;
        case GL_R32F_EXT:
        case GL_RG32F_EXT:
            if (!context->getExtensions().textureRG || !context->getExtensions().textureFloat)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
            break;
        case GL_DEPTH_COMPONENT16:
        case GL_DEPTH_COMPONENT32_OES:
            if (!(context->getExtensions().depthTextureAny()))
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
            if (target != TextureType::_2D)
            {
                context->validationError(GL_INVALID_OPERATION, kInvalidTextureTarget);
                return false;
            }
            // ANGLE_depth_texture only supports 1-level textures
            if (!context->getExtensions().depthTextureOES)
            {
                if (levels != 1)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidMipLevels);
                    return false;
                }
            }
            break;
        case GL_DEPTH24_STENCIL8_OES:
            if (!(context->getExtensions().depthTextureANGLE ||
                  (context->getExtensions().packedDepthStencil &&
                   context->getExtensions().textureStorage)))
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
            if (target != TextureType::_2D)
            {
                context->validationError(GL_INVALID_OPERATION, kInvalidTextureTarget);
                return false;
            }
            if (!context->getExtensions().packedDepthStencil)
            {
                // ANGLE_depth_texture only supports 1-level textures
                if (levels != 1)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidMipLevels);
                    return false;
                }
            }
            break;

        default:
            break;
    }

    gl::Texture *texture = context->getTextureByType(target);
    if (!texture || texture->id() == 0)
    {
        context->validationError(GL_INVALID_OPERATION, kMissingTexture);
        return false;
    }

    if (texture->getImmutableFormat())
    {
        context->validationError(GL_INVALID_OPERATION, kTextureIsImmutable);
        return false;
    }

    return true;
}

bool ValidateDiscardFramebufferEXT(Context *context,
                                   GLenum target,
                                   GLsizei numAttachments,
                                   const GLenum *attachments)
{
    if (!context->getExtensions().discardFramebuffer)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    bool defaultFramebuffer = false;

    switch (target)
    {
        case GL_FRAMEBUFFER:
            defaultFramebuffer =
                (context->getState().getTargetFramebuffer(GL_FRAMEBUFFER)->id() == 0);
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidFramebufferTarget);
            return false;
    }

    return ValidateDiscardFramebufferBase(context, target, numAttachments, attachments,
                                          defaultFramebuffer);
}

bool ValidateBindVertexArrayOES(Context *context, GLuint array)
{
    if (!context->getExtensions().vertexArrayObject)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateBindVertexArrayBase(context, array);
}

bool ValidateDeleteVertexArraysOES(Context *context, GLsizei n, const GLuint *arrays)
{
    if (!context->getExtensions().vertexArrayObject)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateGenOrDelete(context, n);
}

bool ValidateGenVertexArraysOES(Context *context, GLsizei n, GLuint *arrays)
{
    if (!context->getExtensions().vertexArrayObject)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateGenOrDelete(context, n);
}

bool ValidateIsVertexArrayOES(Context *context, GLuint array)
{
    if (!context->getExtensions().vertexArrayObject)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return true;
}

bool ValidateProgramBinaryOES(Context *context,
                              GLuint program,
                              GLenum binaryFormat,
                              const void *binary,
                              GLint length)
{
    if (!context->getExtensions().getProgramBinary)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateProgramBinaryBase(context, program, binaryFormat, binary, length);
}

bool ValidateGetProgramBinaryOES(Context *context,
                                 GLuint program,
                                 GLsizei bufSize,
                                 GLsizei *length,
                                 GLenum *binaryFormat,
                                 void *binary)
{
    if (!context->getExtensions().getProgramBinary)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateGetProgramBinaryBase(context, program, bufSize, length, binaryFormat, binary);
}

static bool ValidDebugSource(GLenum source, bool mustBeThirdPartyOrApplication)
{
    switch (source)
    {
        case GL_DEBUG_SOURCE_API:
        case GL_DEBUG_SOURCE_SHADER_COMPILER:
        case GL_DEBUG_SOURCE_WINDOW_SYSTEM:
        case GL_DEBUG_SOURCE_OTHER:
            // Only THIRD_PARTY and APPLICATION sources are allowed to be manually inserted
            return !mustBeThirdPartyOrApplication;

        case GL_DEBUG_SOURCE_THIRD_PARTY:
        case GL_DEBUG_SOURCE_APPLICATION:
            return true;

        default:
            return false;
    }
}

static bool ValidDebugType(GLenum type)
{
    switch (type)
    {
        case GL_DEBUG_TYPE_ERROR:
        case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR:
        case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR:
        case GL_DEBUG_TYPE_PERFORMANCE:
        case GL_DEBUG_TYPE_PORTABILITY:
        case GL_DEBUG_TYPE_OTHER:
        case GL_DEBUG_TYPE_MARKER:
        case GL_DEBUG_TYPE_PUSH_GROUP:
        case GL_DEBUG_TYPE_POP_GROUP:
            return true;

        default:
            return false;
    }
}

static bool ValidDebugSeverity(GLenum severity)
{
    switch (severity)
    {
        case GL_DEBUG_SEVERITY_HIGH:
        case GL_DEBUG_SEVERITY_MEDIUM:
        case GL_DEBUG_SEVERITY_LOW:
        case GL_DEBUG_SEVERITY_NOTIFICATION:
            return true;

        default:
            return false;
    }
}

bool ValidateDebugMessageControlKHR(Context *context,
                                    GLenum source,
                                    GLenum type,
                                    GLenum severity,
                                    GLsizei count,
                                    const GLuint *ids,
                                    GLboolean enabled)
{
    if (!context->getExtensions().debug)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (!ValidDebugSource(source, false) && source != GL_DONT_CARE)
    {
        context->validationError(GL_INVALID_ENUM, kInvalidDebugSource);
        return false;
    }

    if (!ValidDebugType(type) && type != GL_DONT_CARE)
    {
        context->validationError(GL_INVALID_ENUM, kInvalidDebugType);
        return false;
    }

    if (!ValidDebugSeverity(severity) && severity != GL_DONT_CARE)
    {
        context->validationError(GL_INVALID_ENUM, kInvalidDebugSeverity);
        return false;
    }

    if (count > 0)
    {
        if (source == GL_DONT_CARE || type == GL_DONT_CARE)
        {
            context->validationError(GL_INVALID_OPERATION, kInvalidDebugSourceType);
            return false;
        }

        if (severity != GL_DONT_CARE)
        {
            context->validationError(GL_INVALID_OPERATION, kInvalidDebugSeverity);
            return false;
        }
    }

    return true;
}

bool ValidateDebugMessageInsertKHR(Context *context,
                                   GLenum source,
                                   GLenum type,
                                   GLuint id,
                                   GLenum severity,
                                   GLsizei length,
                                   const GLchar *buf)
{
    if (!context->getExtensions().debug)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (!context->getState().getDebug().isOutputEnabled())
    {
        // If the DEBUG_OUTPUT state is disabled calls to DebugMessageInsert are discarded and do
        // not generate an error.
        return false;
    }

    if (!ValidDebugSeverity(severity))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidDebugSource);
        return false;
    }

    if (!ValidDebugType(type))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidDebugType);
        return false;
    }

    if (!ValidDebugSource(source, true))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidDebugSource);
        return false;
    }

    size_t messageLength = (length < 0) ? strlen(buf) : length;
    if (messageLength > context->getExtensions().maxDebugMessageLength)
    {
        context->validationError(GL_INVALID_VALUE, kExceedsMaxDebugMessageLength);
        return false;
    }

    return true;
}

bool ValidateDebugMessageCallbackKHR(Context *context,
                                     GLDEBUGPROCKHR callback,
                                     const void *userParam)
{
    if (!context->getExtensions().debug)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return true;
}

bool ValidateGetDebugMessageLogKHR(Context *context,
                                   GLuint count,
                                   GLsizei bufSize,
                                   GLenum *sources,
                                   GLenum *types,
                                   GLuint *ids,
                                   GLenum *severities,
                                   GLsizei *lengths,
                                   GLchar *messageLog)
{
    if (!context->getExtensions().debug)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (bufSize < 0 && messageLog != nullptr)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeBufferSize);
        return false;
    }

    return true;
}

bool ValidatePushDebugGroupKHR(Context *context,
                               GLenum source,
                               GLuint id,
                               GLsizei length,
                               const GLchar *message)
{
    if (!context->getExtensions().debug)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (!ValidDebugSource(source, true))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidDebugSource);
        return false;
    }

    size_t messageLength = (length < 0) ? strlen(message) : length;
    if (messageLength > context->getExtensions().maxDebugMessageLength)
    {
        context->validationError(GL_INVALID_VALUE, kExceedsMaxDebugMessageLength);
        return false;
    }

    size_t currentStackSize = context->getState().getDebug().getGroupStackDepth();
    if (currentStackSize >= context->getExtensions().maxDebugGroupStackDepth)
    {
        context->validationError(GL_STACK_OVERFLOW, kExceedsMaxDebugGroupStackDepth);
        return false;
    }

    return true;
}

bool ValidatePopDebugGroupKHR(Context *context)
{
    if (!context->getExtensions().debug)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    size_t currentStackSize = context->getState().getDebug().getGroupStackDepth();
    if (currentStackSize <= 1)
    {
        context->validationError(GL_STACK_UNDERFLOW, kCannotPopDefaultDebugGroup);
        return false;
    }

    return true;
}

static bool ValidateObjectIdentifierAndName(Context *context, GLenum identifier, GLuint name)
{
    switch (identifier)
    {
        case GL_BUFFER:
            if (context->getBuffer(name) == nullptr)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidBufferName);
                return false;
            }
            return true;

        case GL_SHADER:
            if (context->getShader(name) == nullptr)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidShaderName);
                return false;
            }
            return true;

        case GL_PROGRAM:
            if (context->getProgramNoResolveLink(name) == nullptr)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidProgramName);
                return false;
            }
            return true;

        case GL_VERTEX_ARRAY:
            if (context->getVertexArray(name) == nullptr)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidVertexArrayName);
                return false;
            }
            return true;

        case GL_QUERY:
            if (context->getQuery(name) == nullptr)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidQueryName);
                return false;
            }
            return true;

        case GL_TRANSFORM_FEEDBACK:
            if (context->getTransformFeedback(name) == nullptr)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidTransformFeedbackName);
                return false;
            }
            return true;

        case GL_SAMPLER:
            if (context->getSampler(name) == nullptr)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidSamplerName);
                return false;
            }
            return true;

        case GL_TEXTURE:
            if (context->getTexture(name) == nullptr)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidTextureName);
                return false;
            }
            return true;

        case GL_RENDERBUFFER:
            if (context->getRenderbuffer(name) == nullptr)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidRenderbufferName);
                return false;
            }
            return true;

        case GL_FRAMEBUFFER:
            if (context->getFramebuffer(name) == nullptr)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidFramebufferName);
                return false;
            }
            return true;

        default:
            context->validationError(GL_INVALID_ENUM, kInvalidIndentifier);
            return false;
    }
}

static bool ValidateLabelLength(Context *context, GLsizei length, const GLchar *label)
{
    size_t labelLength = 0;

    if (length < 0)
    {
        if (label != nullptr)
        {
            labelLength = strlen(label);
        }
    }
    else
    {
        labelLength = static_cast<size_t>(length);
    }

    if (labelLength > context->getExtensions().maxLabelLength)
    {
        context->validationError(GL_INVALID_VALUE, kExceedsMaxLabelLength);
        return false;
    }

    return true;
}

bool ValidateObjectLabelKHR(Context *context,
                            GLenum identifier,
                            GLuint name,
                            GLsizei length,
                            const GLchar *label)
{
    if (!context->getExtensions().debug)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (!ValidateObjectIdentifierAndName(context, identifier, name))
    {
        return false;
    }

    if (!ValidateLabelLength(context, length, label))
    {
        return false;
    }

    return true;
}

bool ValidateGetObjectLabelKHR(Context *context,
                               GLenum identifier,
                               GLuint name,
                               GLsizei bufSize,
                               GLsizei *length,
                               GLchar *label)
{
    if (!context->getExtensions().debug)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (bufSize < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeBufferSize);
        return false;
    }

    if (!ValidateObjectIdentifierAndName(context, identifier, name))
    {
        return false;
    }

    return true;
}

static bool ValidateObjectPtrName(Context *context, const void *ptr)
{
    if (context->getSync(reinterpret_cast<GLsync>(const_cast<void *>(ptr))) == nullptr)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidSyncPointer);
        return false;
    }

    return true;
}

bool ValidateObjectPtrLabelKHR(Context *context,
                               const void *ptr,
                               GLsizei length,
                               const GLchar *label)
{
    if (!context->getExtensions().debug)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (!ValidateObjectPtrName(context, ptr))
    {
        return false;
    }

    if (!ValidateLabelLength(context, length, label))
    {
        return false;
    }

    return true;
}

bool ValidateGetObjectPtrLabelKHR(Context *context,
                                  const void *ptr,
                                  GLsizei bufSize,
                                  GLsizei *length,
                                  GLchar *label)
{
    if (!context->getExtensions().debug)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (bufSize < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeBufferSize);
        return false;
    }

    if (!ValidateObjectPtrName(context, ptr))
    {
        return false;
    }

    return true;
}

bool ValidateGetPointervKHR(Context *context, GLenum pname, void **params)
{
    if (!context->getExtensions().debug)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    // TODO: represent this in Context::getQueryParameterInfo.
    switch (pname)
    {
        case GL_DEBUG_CALLBACK_FUNCTION:
        case GL_DEBUG_CALLBACK_USER_PARAM:
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
            return false;
    }

    return true;
}

bool ValidateGetPointervRobustANGLERobustANGLE(Context *context,
                                               GLenum pname,
                                               GLsizei bufSize,
                                               GLsizei *length,
                                               void **params)
{
    UNIMPLEMENTED();
    return false;
}

bool ValidateBlitFramebufferANGLE(Context *context,
                                  GLint srcX0,
                                  GLint srcY0,
                                  GLint srcX1,
                                  GLint srcY1,
                                  GLint dstX0,
                                  GLint dstY0,
                                  GLint dstX1,
                                  GLint dstY1,
                                  GLbitfield mask,
                                  GLenum filter)
{
    if (!context->getExtensions().framebufferBlit)
    {
        context->validationError(GL_INVALID_OPERATION, kBlitExtensionNotAvailable);
        return false;
    }

    if (srcX1 - srcX0 != dstX1 - dstX0 || srcY1 - srcY0 != dstY1 - dstY0)
    {
        // TODO(jmadill): Determine if this should be available on other implementations.
        context->validationError(GL_INVALID_OPERATION, kBlitExtensionScaleOrFlip);
        return false;
    }

    if (filter == GL_LINEAR)
    {
        context->validationError(GL_INVALID_ENUM, kBlitExtensionLinear);
        return false;
    }

    Framebuffer *readFramebuffer = context->getState().getReadFramebuffer();
    Framebuffer *drawFramebuffer = context->getState().getDrawFramebuffer();

    if (mask & GL_COLOR_BUFFER_BIT)
    {
        const FramebufferAttachment *readColorAttachment = readFramebuffer->getReadColorbuffer();
        const FramebufferAttachment *drawColorAttachment = drawFramebuffer->getFirstColorbuffer();

        if (readColorAttachment && drawColorAttachment)
        {
            if (!(readColorAttachment->type() == GL_TEXTURE &&
                  readColorAttachment->getTextureImageIndex().getType() == TextureType::_2D) &&
                readColorAttachment->type() != GL_RENDERBUFFER &&
                readColorAttachment->type() != GL_FRAMEBUFFER_DEFAULT)
            {
                context->validationError(GL_INVALID_OPERATION,
                                         kBlitExtensionFromInvalidAttachmentType);
                return false;
            }

            for (size_t drawbufferIdx = 0;
                 drawbufferIdx < drawFramebuffer->getDrawbufferStateCount(); ++drawbufferIdx)
            {
                const FramebufferAttachment *attachment =
                    drawFramebuffer->getDrawBuffer(drawbufferIdx);
                if (attachment)
                {
                    if (!(attachment->type() == GL_TEXTURE &&
                          attachment->getTextureImageIndex().getType() == TextureType::_2D) &&
                        attachment->type() != GL_RENDERBUFFER &&
                        attachment->type() != GL_FRAMEBUFFER_DEFAULT)
                    {
                        context->validationError(GL_INVALID_OPERATION,
                                                 kBlitExtensionToInvalidAttachmentType);
                        return false;
                    }

                    // Return an error if the destination formats do not match
                    if (!Format::EquivalentForBlit(attachment->getFormat(),
                                                   readColorAttachment->getFormat()))
                    {
                        context->validationError(GL_INVALID_OPERATION,
                                                 kBlitExtensionFormatMismatch);
                        return false;
                    }
                }
            }

            GLint samples = readFramebuffer->getSamples(context);
            if (samples != 0 &&
                IsPartialBlit(context, readColorAttachment, drawColorAttachment, srcX0, srcY0,
                              srcX1, srcY1, dstX0, dstY0, dstX1, dstY1))
            {
                context->validationError(GL_INVALID_OPERATION,
                                         kBlitExtensionMultisampledWholeBufferBlit);
                return false;
            }
        }
    }

    GLenum masks[]       = {GL_DEPTH_BUFFER_BIT, GL_STENCIL_BUFFER_BIT};
    GLenum attachments[] = {GL_DEPTH_ATTACHMENT, GL_STENCIL_ATTACHMENT};
    for (size_t i = 0; i < 2; i++)
    {
        if (mask & masks[i])
        {
            const FramebufferAttachment *readBuffer =
                readFramebuffer->getAttachment(context, attachments[i]);
            const FramebufferAttachment *drawBuffer =
                drawFramebuffer->getAttachment(context, attachments[i]);

            if (readBuffer && drawBuffer)
            {
                if (IsPartialBlit(context, readBuffer, drawBuffer, srcX0, srcY0, srcX1, srcY1,
                                  dstX0, dstY0, dstX1, dstY1))
                {
                    // only whole-buffer copies are permitted
                    context->validationError(GL_INVALID_OPERATION,
                                             kBlitExtensionDepthStencilWholeBufferBlit);
                    return false;
                }

                if (readBuffer->getSamples() != 0 || drawBuffer->getSamples() != 0)
                {
                    context->validationError(GL_INVALID_OPERATION,
                                             kBlitExtensionMultisampledDepthOrStencil);
                    return false;
                }
            }
        }
    }

    return ValidateBlitFramebufferParameters(context, srcX0, srcY0, srcX1, srcY1, dstX0, dstY0,
                                             dstX1, dstY1, mask, filter);
}

bool ValidateClear(Context *context, GLbitfield mask)
{
    Framebuffer *fbo             = context->getState().getDrawFramebuffer();
    const Extensions &extensions = context->getExtensions();

    if (!ValidateFramebufferComplete(context, fbo))
    {
        return false;
    }

    if ((mask & ~(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT)) != 0)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidClearMask);
        return false;
    }

    if (extensions.webglCompatibility && (mask & GL_COLOR_BUFFER_BIT) != 0)
    {
        constexpr GLenum validComponentTypes[] = {GL_FLOAT, GL_UNSIGNED_NORMALIZED,
                                                  GL_SIGNED_NORMALIZED};

        for (GLuint drawBufferIdx = 0; drawBufferIdx < fbo->getDrawbufferStateCount();
             drawBufferIdx++)
        {
            if (!ValidateWebGLFramebufferAttachmentClearType(
                    context, drawBufferIdx, validComponentTypes, ArraySize(validComponentTypes)))
            {
                return false;
            }
        }
    }

    if ((extensions.multiview || extensions.multiview2) && extensions.disjointTimerQuery)
    {
        const State &state       = context->getState();
        Framebuffer *framebuffer = state.getDrawFramebuffer();
        if (framebuffer->getNumViews() > 1 && state.isQueryActive(QueryType::TimeElapsed))
        {
            context->validationError(GL_INVALID_OPERATION, kMultiviewTimerQuery);
            return false;
        }
    }

    return true;
}

bool ValidateDrawBuffersEXT(Context *context, GLsizei n, const GLenum *bufs)
{
    if (!context->getExtensions().drawBuffers)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateDrawBuffersBase(context, n, bufs);
}

bool ValidateTexImage2D(Context *context,
                        TextureTarget target,
                        GLint level,
                        GLint internalformat,
                        GLsizei width,
                        GLsizei height,
                        GLint border,
                        GLenum format,
                        GLenum type,
                        const void *pixels)
{
    if (context->getClientMajorVersion() < 3)
    {
        return ValidateES2TexImageParameters(context, target, level, internalformat, false, false,
                                             0, 0, width, height, border, format, type, -1, pixels);
    }

    ASSERT(context->getClientMajorVersion() >= 3);
    return ValidateES3TexImage2DParameters(context, target, level, internalformat, false, false, 0,
                                           0, 0, width, height, 1, border, format, type, -1,
                                           pixels);
}

bool ValidateTexImage2DRobustANGLE(Context *context,
                                   TextureTarget target,
                                   GLint level,
                                   GLint internalformat,
                                   GLsizei width,
                                   GLsizei height,
                                   GLint border,
                                   GLenum format,
                                   GLenum type,
                                   GLsizei bufSize,
                                   const void *pixels)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (context->getClientMajorVersion() < 3)
    {
        return ValidateES2TexImageParameters(context, target, level, internalformat, false, false,
                                             0, 0, width, height, border, format, type, bufSize,
                                             pixels);
    }

    ASSERT(context->getClientMajorVersion() >= 3);
    return ValidateES3TexImage2DParameters(context, target, level, internalformat, false, false, 0,
                                           0, 0, width, height, 1, border, format, type, bufSize,
                                           pixels);
}

bool ValidateTexSubImage2D(Context *context,
                           TextureTarget target,
                           GLint level,
                           GLint xoffset,
                           GLint yoffset,
                           GLsizei width,
                           GLsizei height,
                           GLenum format,
                           GLenum type,
                           const void *pixels)
{

    if (context->getClientMajorVersion() < 3)
    {
        return ValidateES2TexImageParameters(context, target, level, GL_NONE, false, true, xoffset,
                                             yoffset, width, height, 0, format, type, -1, pixels);
    }

    ASSERT(context->getClientMajorVersion() >= 3);
    return ValidateES3TexImage2DParameters(context, target, level, GL_NONE, false, true, xoffset,
                                           yoffset, 0, width, height, 1, 0, format, type, -1,
                                           pixels);
}

bool ValidateTexSubImage2DRobustANGLE(Context *context,
                                      TextureTarget target,
                                      GLint level,
                                      GLint xoffset,
                                      GLint yoffset,
                                      GLsizei width,
                                      GLsizei height,
                                      GLenum format,
                                      GLenum type,
                                      GLsizei bufSize,
                                      const void *pixels)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (context->getClientMajorVersion() < 3)
    {
        return ValidateES2TexImageParameters(context, target, level, GL_NONE, false, true, xoffset,
                                             yoffset, width, height, 0, format, type, bufSize,
                                             pixels);
    }

    ASSERT(context->getClientMajorVersion() >= 3);
    return ValidateES3TexImage2DParameters(context, target, level, GL_NONE, false, true, xoffset,
                                           yoffset, 0, width, height, 1, 0, format, type, bufSize,
                                           pixels);
}

bool ValidateCompressedTexImage2D(Context *context,
                                  TextureTarget target,
                                  GLint level,
                                  GLenum internalformat,
                                  GLsizei width,
                                  GLsizei height,
                                  GLint border,
                                  GLsizei imageSize,
                                  const void *data)
{
    if (context->getClientMajorVersion() < 3)
    {
        if (!ValidateES2TexImageParameters(context, target, level, internalformat, true, false, 0,
                                           0, width, height, border, GL_NONE, GL_NONE, -1, data))
        {
            return false;
        }
    }
    else
    {
        ASSERT(context->getClientMajorVersion() >= 3);
        if (!ValidateES3TexImage2DParameters(context, target, level, internalformat, true, false, 0,
                                             0, 0, width, height, 1, border, GL_NONE, GL_NONE, -1,
                                             data))
        {
            return false;
        }
    }

    const InternalFormat &formatInfo = GetSizedInternalFormatInfo(internalformat);

    GLuint blockSize = 0;
    if (!formatInfo.computeCompressedImageSize(gl::Extents(width, height, 1), &blockSize))
    {
        context->validationError(GL_INVALID_OPERATION, kIntegerOverflow);
        return false;
    }

    if (imageSize < 0 || static_cast<GLuint>(imageSize) != blockSize)
    {
        context->validationError(GL_INVALID_VALUE, kCompressedTextureDimensionsMustMatchData);
        return false;
    }

    if (target == TextureTarget::Rectangle)
    {
        context->validationError(GL_INVALID_ENUM, kRectangleTextureCompressed);
        return false;
    }

    return true;
}

bool ValidateCompressedTexImage2DRobustANGLE(Context *context,
                                             TextureTarget target,
                                             GLint level,
                                             GLenum internalformat,
                                             GLsizei width,
                                             GLsizei height,
                                             GLint border,
                                             GLsizei imageSize,
                                             GLsizei dataSize,
                                             const void *data)
{
    if (!ValidateRobustCompressedTexImageBase(context, imageSize, dataSize))
    {
        return false;
    }

    return ValidateCompressedTexImage2D(context, target, level, internalformat, width, height,
                                        border, imageSize, data);
}

bool ValidateCompressedTexSubImage2DRobustANGLE(Context *context,
                                                TextureTarget target,
                                                GLint level,
                                                GLint xoffset,
                                                GLint yoffset,
                                                GLsizei width,
                                                GLsizei height,
                                                GLenum format,
                                                GLsizei imageSize,
                                                GLsizei dataSize,
                                                const void *data)
{
    if (!ValidateRobustCompressedTexImageBase(context, imageSize, dataSize))
    {
        return false;
    }

    return ValidateCompressedTexSubImage2D(context, target, level, xoffset, yoffset, width, height,
                                           format, imageSize, data);
}

bool ValidateCompressedTexSubImage2D(Context *context,
                                     TextureTarget target,
                                     GLint level,
                                     GLint xoffset,
                                     GLint yoffset,
                                     GLsizei width,
                                     GLsizei height,
                                     GLenum format,
                                     GLsizei imageSize,
                                     const void *data)
{
    if (context->getClientMajorVersion() < 3)
    {
        if (!ValidateES2TexImageParameters(context, target, level, GL_NONE, true, true, xoffset,
                                           yoffset, width, height, 0, format, GL_NONE, -1, data))
        {
            return false;
        }
    }
    else
    {
        ASSERT(context->getClientMajorVersion() >= 3);
        if (!ValidateES3TexImage2DParameters(context, target, level, GL_NONE, true, true, xoffset,
                                             yoffset, 0, width, height, 1, 0, format, GL_NONE, -1,
                                             data))
        {
            return false;
        }
    }

    const InternalFormat &formatInfo = GetSizedInternalFormatInfo(format);
    GLuint blockSize                 = 0;
    if (!formatInfo.computeCompressedImageSize(gl::Extents(width, height, 1), &blockSize))
    {
        context->validationError(GL_INVALID_OPERATION, kIntegerOverflow);
        return false;
    }

    if (imageSize < 0 || static_cast<GLuint>(imageSize) != blockSize)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidCompressedImageSize);
        return false;
    }

    return true;
}

bool ValidateGetBufferPointervOES(Context *context,
                                  BufferBinding target,
                                  GLenum pname,
                                  void **params)
{
    if (!context->getExtensions().mapBuffer)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateGetBufferPointervBase(context, target, pname, nullptr, params);
}

bool ValidateMapBufferOES(Context *context, BufferBinding target, GLenum access)
{
    if (!context->getExtensions().mapBuffer)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (!context->isValidBufferBinding(target))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidBufferTypes);
        return false;
    }

    Buffer *buffer = context->getState().getTargetBuffer(target);

    if (buffer == nullptr)
    {
        context->validationError(GL_INVALID_OPERATION, kBufferNotMappable);
        return false;
    }

    if (access != GL_WRITE_ONLY_OES)
    {
        context->validationError(GL_INVALID_ENUM, kInvalidAccessBits);
        return false;
    }

    if (buffer->isMapped())
    {
        context->validationError(GL_INVALID_OPERATION, kBufferAlreadyMapped);
        return false;
    }

    return ValidateMapBufferBase(context, target);
}

bool ValidateUnmapBufferOES(Context *context, BufferBinding target)
{
    if (!context->getExtensions().mapBuffer)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateUnmapBufferBase(context, target);
}

bool ValidateMapBufferRangeEXT(Context *context,
                               BufferBinding target,
                               GLintptr offset,
                               GLsizeiptr length,
                               GLbitfield access)
{
    if (!context->getExtensions().mapBufferRange)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateMapBufferRangeBase(context, target, offset, length, access);
}

bool ValidateBufferStorageMemEXT(Context *context,
                                 TextureType target,
                                 GLsizeiptr size,
                                 GLuint memory,
                                 GLuint64 offset)
{
    if (!context->getExtensions().memoryObject)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    UNIMPLEMENTED();
    return false;
}

bool ValidateCreateMemoryObjectsEXT(Context *context, GLsizei n, GLuint *memoryObjects)
{
    if (!context->getExtensions().memoryObject)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateGenOrDelete(context, n);
}

bool ValidateDeleteMemoryObjectsEXT(Context *context, GLsizei n, const GLuint *memoryObjects)
{
    if (!context->getExtensions().memoryObject)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateGenOrDelete(context, n);
}

bool ValidateGetMemoryObjectParameterivEXT(Context *context,
                                           GLuint memoryObject,
                                           GLenum pname,
                                           GLint *params)
{
    if (!context->getExtensions().memoryObject)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    UNIMPLEMENTED();
    return false;
}

bool ValidateGetUnsignedBytevEXT(Context *context, GLenum pname, GLubyte *data)
{
    if (!context->getExtensions().memoryObject && !context->getExtensions().semaphore)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    UNIMPLEMENTED();
    return false;
}

bool ValidateGetUnsignedBytei_vEXT(Context *context, GLenum target, GLuint index, GLubyte *data)
{
    if (!context->getExtensions().memoryObject && !context->getExtensions().semaphore)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    UNIMPLEMENTED();
    return false;
}

bool ValidateIsMemoryObjectEXT(Context *context, GLuint memoryObject)
{
    if (!context->getExtensions().memoryObject)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return true;
}

bool ValidateMemoryObjectParameterivEXT(Context *context,
                                        GLuint memoryObject,
                                        GLenum pname,
                                        const GLint *params)
{
    if (!context->getExtensions().memoryObject)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    UNIMPLEMENTED();
    return false;
}

bool ValidateTexStorageMem2DEXT(Context *context,
                                TextureType target,
                                GLsizei levels,
                                GLenum internalFormat,
                                GLsizei width,
                                GLsizei height,
                                GLuint memory,
                                GLuint64 offset)
{
    if (!context->getExtensions().memoryObject)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (context->getClientMajorVersion() < 3)
    {
        return ValidateES2TexStorageParameters(context, target, levels, internalFormat, width,
                                               height);
    }

    ASSERT(context->getClientMajorVersion() >= 3);
    return ValidateES3TexStorage2DParameters(context, target, levels, internalFormat, width, height,
                                             1);
}

bool ValidateTexStorageMem3DEXT(Context *context,
                                TextureType target,
                                GLsizei levels,
                                GLenum internalFormat,
                                GLsizei width,
                                GLsizei height,
                                GLsizei depth,
                                GLuint memory,
                                GLuint64 offset)
{
    if (!context->getExtensions().memoryObject)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    UNIMPLEMENTED();
    return false;
}

bool ValidateImportMemoryFdEXT(Context *context,
                               GLuint memory,
                               GLuint64 size,
                               HandleType handleType,
                               GLint fd)
{
    if (!context->getExtensions().memoryObjectFd)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    switch (handleType)
    {
        case HandleType::OpaqueFd:
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidHandleType);
            return false;
    }

    return true;
}

bool ValidateDeleteSemaphoresEXT(Context *context, GLsizei n, const GLuint *semaphores)
{
    if (!context->getExtensions().semaphore)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateGenOrDelete(context, n);
}

bool ValidateGenSemaphoresEXT(Context *context, GLsizei n, GLuint *semaphores)
{
    if (!context->getExtensions().semaphore)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateGenOrDelete(context, n);
}

bool ValidateGetSemaphoreParameterui64vEXT(Context *context,
                                           GLuint semaphore,
                                           GLenum pname,
                                           GLuint64 *params)
{
    if (!context->getExtensions().semaphore)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    UNIMPLEMENTED();
    return false;
}

bool ValidateIsSemaphoreEXT(Context *context, GLuint semaphore)
{
    if (!context->getExtensions().semaphore)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return true;
}

bool ValidateSemaphoreParameterui64vEXT(Context *context,
                                        GLuint semaphore,
                                        GLenum pname,
                                        const GLuint64 *params)
{
    if (!context->getExtensions().semaphore)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    UNIMPLEMENTED();
    return false;
}

bool ValidateSignalSemaphoreEXT(Context *context,
                                GLuint semaphore,
                                GLuint numBufferBarriers,
                                const GLuint *buffers,
                                GLuint numTextureBarriers,
                                const GLuint *textures,
                                const GLenum *dstLayouts)
{
    if (!context->getExtensions().semaphore)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    for (GLuint i = 0; i < numTextureBarriers; ++i)
    {
        if (!IsValidImageLayout(FromGLenum<ImageLayout>(dstLayouts[i])))
        {
            context->validationError(GL_INVALID_ENUM, kInvalidImageLayout);
            return false;
        }
    }

    return true;
}

bool ValidateWaitSemaphoreEXT(Context *context,
                              GLuint semaphore,
                              GLuint numBufferBarriers,
                              const GLuint *buffers,
                              GLuint numTextureBarriers,
                              const GLuint *textures,
                              const GLenum *srcLayouts)
{
    if (!context->getExtensions().semaphore)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    for (GLuint i = 0; i < numTextureBarriers; ++i)
    {
        if (!IsValidImageLayout(FromGLenum<ImageLayout>(srcLayouts[i])))
        {
            context->validationError(GL_INVALID_ENUM, kInvalidImageLayout);
            return false;
        }
    }

    return true;
}

bool ValidateImportSemaphoreFdEXT(Context *context,
                                  GLuint semaphore,
                                  HandleType handleType,
                                  GLint fd)
{
    if (!context->getExtensions().semaphoreFd)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    switch (handleType)
    {
        case HandleType::OpaqueFd:
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidHandleType);
            return false;
    }

    return true;
}

bool ValidateMapBufferBase(Context *context, BufferBinding target)
{
    Buffer *buffer = context->getState().getTargetBuffer(target);
    ASSERT(buffer != nullptr);

    // Check if this buffer is currently being used as a transform feedback output buffer
    TransformFeedback *transformFeedback = context->getState().getCurrentTransformFeedback();
    if (transformFeedback != nullptr && transformFeedback->isActive())
    {
        for (size_t i = 0; i < transformFeedback->getIndexedBufferCount(); i++)
        {
            const auto &transformFeedbackBuffer = transformFeedback->getIndexedBuffer(i);
            if (transformFeedbackBuffer.get() == buffer)
            {
                context->validationError(GL_INVALID_OPERATION, kBufferBoundForTransformFeedback);
                return false;
            }
        }
    }

    if (context->getExtensions().webglCompatibility &&
        buffer->isBoundForTransformFeedbackAndOtherUse())
    {
        context->validationError(GL_INVALID_OPERATION, kBufferBoundForTransformFeedback);
        return false;
    }

    return true;
}

bool ValidateFlushMappedBufferRangeEXT(Context *context,
                                       BufferBinding target,
                                       GLintptr offset,
                                       GLsizeiptr length)
{
    if (!context->getExtensions().mapBufferRange)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateFlushMappedBufferRangeBase(context, target, offset, length);
}

bool ValidateBindUniformLocationCHROMIUM(Context *context,
                                         GLuint program,
                                         GLint location,
                                         const GLchar *name)
{
    if (!context->getExtensions().bindUniformLocation)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    Program *programObject = GetValidProgram(context, program);
    if (!programObject)
    {
        return false;
    }

    if (location < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeLocation);
        return false;
    }

    const Caps &caps = context->getCaps();
    if (static_cast<size_t>(location) >=
        (caps.maxVertexUniformVectors + caps.maxFragmentUniformVectors) * 4)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidBindUniformLocation);
        return false;
    }

    // The WebGL spec (section 6.20) disallows strings containing invalid ESSL characters for
    // shader-related entry points
    if (context->getExtensions().webglCompatibility && !IsValidESSLString(name, strlen(name)))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidNameCharacters);
        return false;
    }

    if (strncmp(name, "gl_", 3) == 0)
    {
        context->validationError(GL_INVALID_VALUE, kNameBeginsWithGL);
        return false;
    }

    return true;
}

bool ValidateCoverageModulationCHROMIUM(Context *context, GLenum components)
{
    if (!context->getExtensions().framebufferMixedSamples)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }
    switch (components)
    {
        case GL_RGB:
        case GL_RGBA:
        case GL_ALPHA:
        case GL_NONE:
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidCoverageComponents);
            return false;
    }

    return true;
}

// CHROMIUM_path_rendering

bool ValidateMatrixLoadfCHROMIUM(Context *context, GLenum matrixMode, const GLfloat *matrix)
{
    if (!ValidateMatrixMode(context, matrixMode))
    {
        return false;
    }

    if (matrix == nullptr)
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidPathMatrix);
        return false;
    }

    return true;
}

bool ValidateMatrixLoadIdentityCHROMIUM(Context *context, GLenum matrixMode)
{
    return ValidateMatrixMode(context, matrixMode);
}

bool ValidateGenPathsCHROMIUM(Context *context, GLsizei range)
{
    if (!context->getExtensions().pathRendering)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    // range = 0 is undefined in NV_path_rendering.
    // we add stricter semantic check here and require a non zero positive range.
    if (range <= 0)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidRange);
        return false;
    }

    if (!angle::IsValueInRangeForNumericType<std::uint32_t>(range))
    {
        context->validationError(GL_INVALID_OPERATION, kIntegerOverflow);
        return false;
    }

    return true;
}

bool ValidateDeletePathsCHROMIUM(Context *context, GLuint path, GLsizei range)
{
    if (!context->getExtensions().pathRendering)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    // range = 0 is undefined in NV_path_rendering.
    // we add stricter semantic check here and require a non zero positive range.
    if (range <= 0)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidRange);
        return false;
    }

    angle::CheckedNumeric<std::uint32_t> checkedRange(path);
    checkedRange += range;

    if (!angle::IsValueInRangeForNumericType<std::uint32_t>(range) || !checkedRange.IsValid())
    {
        context->validationError(GL_INVALID_OPERATION, kIntegerOverflow);
        return false;
    }
    return true;
}

bool ValidatePathCommandsCHROMIUM(Context *context,
                                  GLuint path,
                                  GLsizei numCommands,
                                  const GLubyte *commands,
                                  GLsizei numCoords,
                                  GLenum coordType,
                                  const void *coords)
{
    if (!context->getExtensions().pathRendering)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }
    if (!context->isPathGenerated(path))
    {
        context->validationError(GL_INVALID_OPERATION, kNoSuchPath);
        return false;
    }

    if (numCommands < 0)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidPathNumCommands);
        return false;
    }
    else if (numCommands > 0)
    {
        if (!commands)
        {
            context->validationError(GL_INVALID_VALUE, kInvalidPathCommandsArray);
            return false;
        }
    }

    if (numCoords < 0)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidPathNumCoords);
        return false;
    }
    else if (numCoords > 0)
    {
        if (!coords)
        {
            context->validationError(GL_INVALID_VALUE, kInvalidPathNumCoordsArray);
            return false;
        }
    }

    std::uint32_t coordTypeSize = 0;
    switch (coordType)
    {
        case GL_BYTE:
            coordTypeSize = sizeof(GLbyte);
            break;

        case GL_UNSIGNED_BYTE:
            coordTypeSize = sizeof(GLubyte);
            break;

        case GL_SHORT:
            coordTypeSize = sizeof(GLshort);
            break;

        case GL_UNSIGNED_SHORT:
            coordTypeSize = sizeof(GLushort);
            break;

        case GL_FLOAT:
            coordTypeSize = sizeof(GLfloat);
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kInvalidPathCoordinateType);
            return false;
    }

    angle::CheckedNumeric<std::uint32_t> checkedSize(numCommands);
    checkedSize += (coordTypeSize * numCoords);
    if (!checkedSize.IsValid())
    {
        context->validationError(GL_INVALID_OPERATION, kIntegerOverflow);
        return false;
    }

    // early return skips command data validation when it doesn't exist.
    if (!commands)
        return true;

    GLsizei expectedNumCoords = 0;
    for (GLsizei i = 0; i < numCommands; ++i)
    {
        switch (commands[i])
        {
            case GL_CLOSE_PATH_CHROMIUM:  // no coordinates.
                break;
            case GL_MOVE_TO_CHROMIUM:
            case GL_LINE_TO_CHROMIUM:
                expectedNumCoords += 2;
                break;
            case GL_QUADRATIC_CURVE_TO_CHROMIUM:
                expectedNumCoords += 4;
                break;
            case GL_CUBIC_CURVE_TO_CHROMIUM:
                expectedNumCoords += 6;
                break;
            case GL_CONIC_CURVE_TO_CHROMIUM:
                expectedNumCoords += 5;
                break;
            default:
                context->validationError(GL_INVALID_ENUM, kInvalidPathCommand);
                return false;
        }
    }

    if (expectedNumCoords != numCoords)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidPathNumCoords);
        return false;
    }

    return true;
}

bool ValidatePathParameterfCHROMIUM(Context *context, GLuint path, GLenum pname, GLfloat value)
{
    if (!context->getExtensions().pathRendering)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }
    if (!context->isPathGenerated(path))
    {
        context->validationError(GL_INVALID_OPERATION, kNoSuchPath);
        return false;
    }

    switch (pname)
    {
        case GL_PATH_STROKE_WIDTH_CHROMIUM:
            if (value < 0.0f)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidPathStrokeWidth);
                return false;
            }
            break;
        case GL_PATH_END_CAPS_CHROMIUM:
            switch (static_cast<GLenum>(value))
            {
                case GL_FLAT_CHROMIUM:
                case GL_SQUARE_CHROMIUM:
                case GL_ROUND_CHROMIUM:
                    break;
                default:
                    context->validationError(GL_INVALID_ENUM, kInvalidPathEndCaps);
                    return false;
            }
            break;
        case GL_PATH_JOIN_STYLE_CHROMIUM:
            switch (static_cast<GLenum>(value))
            {
                case GL_MITER_REVERT_CHROMIUM:
                case GL_BEVEL_CHROMIUM:
                case GL_ROUND_CHROMIUM:
                    break;
                default:
                    context->validationError(GL_INVALID_ENUM, kInvalidPathJoinStyle);
                    return false;
            }
            break;
        case GL_PATH_MITER_LIMIT_CHROMIUM:
            if (value < 0.0f)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidPathMiterLimit);
                return false;
            }
            break;

        case GL_PATH_STROKE_BOUND_CHROMIUM:
            // no errors, only clamping.
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kInvalidPathParameter);
            return false;
    }
    return true;
}

bool ValidatePathParameteriCHROMIUM(Context *context, GLuint path, GLenum pname, GLint value)
{
    // TODO(jmadill): Use proper clamping cast.
    return ValidatePathParameterfCHROMIUM(context, path, pname, static_cast<GLfloat>(value));
}

bool ValidateGetPathParameterfvCHROMIUM(Context *context, GLuint path, GLenum pname, GLfloat *value)
{
    if (!context->getExtensions().pathRendering)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (!context->isPathGenerated(path))
    {
        context->validationError(GL_INVALID_OPERATION, kNoSuchPath);
        return false;
    }

    if (!value)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidPathValueArray);
        return false;
    }

    switch (pname)
    {
        case GL_PATH_STROKE_WIDTH_CHROMIUM:
        case GL_PATH_END_CAPS_CHROMIUM:
        case GL_PATH_JOIN_STYLE_CHROMIUM:
        case GL_PATH_MITER_LIMIT_CHROMIUM:
        case GL_PATH_STROKE_BOUND_CHROMIUM:
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kInvalidPathParameter);
            return false;
    }

    return true;
}

bool ValidateGetPathParameterivCHROMIUM(Context *context, GLuint path, GLenum pname, GLint *value)
{
    return ValidateGetPathParameterfvCHROMIUM(context, path, pname,
                                              reinterpret_cast<GLfloat *>(value));
}

bool ValidatePathStencilFuncCHROMIUM(Context *context, GLenum func, GLint ref, GLuint mask)
{
    if (!context->getExtensions().pathRendering)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    switch (func)
    {
        case GL_NEVER:
        case GL_ALWAYS:
        case GL_LESS:
        case GL_LEQUAL:
        case GL_EQUAL:
        case GL_GEQUAL:
        case GL_GREATER:
        case GL_NOTEQUAL:
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidStencil);
            return false;
    }

    return true;
}

// Note that the spec specifies that for the path drawing commands
// if the path object is not an existing path object the command
// does nothing and no error is generated.
// However if the path object exists but has not been specified any
// commands then an error is generated.

bool ValidateStencilFillPathCHROMIUM(Context *context, GLuint path, GLenum fillMode, GLuint mask)
{
    if (!context->getExtensions().pathRendering)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }
    if (context->isPathGenerated(path) && !context->isPath(path))
    {
        context->validationError(GL_INVALID_OPERATION, kNoSuchPath);
        return false;
    }

    switch (fillMode)
    {
        case GL_COUNT_UP_CHROMIUM:
        case GL_COUNT_DOWN_CHROMIUM:
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidFillMode);
            return false;
    }

    if (!isPow2(mask + 1))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidStencilBitMask);
        return false;
    }

    return true;
}

bool ValidateStencilStrokePathCHROMIUM(Context *context, GLuint path, GLint reference, GLuint mask)
{
    if (!context->getExtensions().pathRendering)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (context->isPathGenerated(path) && !context->isPath(path))
    {
        context->validationError(GL_INVALID_OPERATION, kNoPathOrNoPathData);
        return false;
    }

    return true;
}

bool ValidateCoverPathCHROMIUM(Context *context, GLuint path, GLenum coverMode)
{
    if (!context->getExtensions().pathRendering)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }
    if (context->isPathGenerated(path) && !context->isPath(path))
    {
        context->validationError(GL_INVALID_OPERATION, kNoSuchPath);
        return false;
    }

    switch (coverMode)
    {
        case GL_CONVEX_HULL_CHROMIUM:
        case GL_BOUNDING_BOX_CHROMIUM:
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidCoverMode);
            return false;
    }
    return true;
}

bool ValidateCoverFillPathCHROMIUM(Context *context, GLuint path, GLenum coverMode)
{
    return ValidateCoverPathCHROMIUM(context, path, coverMode);
}

bool ValidateCoverStrokePathCHROMIUM(Context *context, GLuint path, GLenum coverMode)
{
    return ValidateCoverPathCHROMIUM(context, path, coverMode);
}

bool ValidateStencilThenCoverFillPathCHROMIUM(Context *context,
                                              GLuint path,
                                              GLenum fillMode,
                                              GLuint mask,
                                              GLenum coverMode)
{
    return ValidateStencilFillPathCHROMIUM(context, path, fillMode, mask) &&
           ValidateCoverPathCHROMIUM(context, path, coverMode);
}

bool ValidateStencilThenCoverStrokePathCHROMIUM(Context *context,
                                                GLuint path,
                                                GLint reference,
                                                GLuint mask,
                                                GLenum coverMode)
{
    return ValidateStencilStrokePathCHROMIUM(context, path, reference, mask) &&
           ValidateCoverPathCHROMIUM(context, path, coverMode);
}

bool ValidateIsPathCHROMIUM(Context *context, GLuint path)
{
    if (!context->getExtensions().pathRendering)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }
    return true;
}

bool ValidateCoverFillPathInstancedCHROMIUM(Context *context,
                                            GLsizei numPaths,
                                            GLenum pathNameType,
                                            const void *paths,
                                            GLuint pathBase,
                                            GLenum coverMode,
                                            GLenum transformType,
                                            const GLfloat *transformValues)
{
    if (!ValidateInstancedPathParameters(context, numPaths, pathNameType, paths, pathBase,
                                         transformType, transformValues))
        return false;

    switch (coverMode)
    {
        case GL_CONVEX_HULL_CHROMIUM:
        case GL_BOUNDING_BOX_CHROMIUM:
        case GL_BOUNDING_BOX_OF_BOUNDING_BOXES_CHROMIUM:
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidCoverMode);
            return false;
    }

    return true;
}

bool ValidateCoverStrokePathInstancedCHROMIUM(Context *context,
                                              GLsizei numPaths,
                                              GLenum pathNameType,
                                              const void *paths,
                                              GLuint pathBase,
                                              GLenum coverMode,
                                              GLenum transformType,
                                              const GLfloat *transformValues)
{
    if (!ValidateInstancedPathParameters(context, numPaths, pathNameType, paths, pathBase,
                                         transformType, transformValues))
        return false;

    switch (coverMode)
    {
        case GL_CONVEX_HULL_CHROMIUM:
        case GL_BOUNDING_BOX_CHROMIUM:
        case GL_BOUNDING_BOX_OF_BOUNDING_BOXES_CHROMIUM:
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidCoverMode);
            return false;
    }

    return true;
}

bool ValidateStencilFillPathInstancedCHROMIUM(Context *context,
                                              GLsizei numPaths,
                                              GLenum pathNameType,
                                              const void *paths,
                                              GLuint pathBase,
                                              GLenum fillMode,
                                              GLuint mask,
                                              GLenum transformType,
                                              const GLfloat *transformValues)
{

    if (!ValidateInstancedPathParameters(context, numPaths, pathNameType, paths, pathBase,
                                         transformType, transformValues))
        return false;

    switch (fillMode)
    {
        case GL_COUNT_UP_CHROMIUM:
        case GL_COUNT_DOWN_CHROMIUM:
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidFillMode);
            return false;
    }
    if (!isPow2(mask + 1))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidStencilBitMask);
        return false;
    }
    return true;
}

bool ValidateStencilStrokePathInstancedCHROMIUM(Context *context,
                                                GLsizei numPaths,
                                                GLenum pathNameType,
                                                const void *paths,
                                                GLuint pathBase,
                                                GLint reference,
                                                GLuint mask,
                                                GLenum transformType,
                                                const GLfloat *transformValues)
{
    if (!ValidateInstancedPathParameters(context, numPaths, pathNameType, paths, pathBase,
                                         transformType, transformValues))
        return false;

    // no more validation here.

    return true;
}

bool ValidateStencilThenCoverFillPathInstancedCHROMIUM(Context *context,
                                                       GLsizei numPaths,
                                                       GLenum pathNameType,
                                                       const void *paths,
                                                       GLuint pathBase,
                                                       GLenum fillMode,
                                                       GLuint mask,
                                                       GLenum coverMode,
                                                       GLenum transformType,
                                                       const GLfloat *transformValues)
{
    if (!ValidateInstancedPathParameters(context, numPaths, pathNameType, paths, pathBase,
                                         transformType, transformValues))
        return false;

    switch (coverMode)
    {
        case GL_CONVEX_HULL_CHROMIUM:
        case GL_BOUNDING_BOX_CHROMIUM:
        case GL_BOUNDING_BOX_OF_BOUNDING_BOXES_CHROMIUM:
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidCoverMode);
            return false;
    }

    switch (fillMode)
    {
        case GL_COUNT_UP_CHROMIUM:
        case GL_COUNT_DOWN_CHROMIUM:
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidFillMode);
            return false;
    }
    if (!isPow2(mask + 1))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidStencilBitMask);
        return false;
    }

    return true;
}

bool ValidateStencilThenCoverStrokePathInstancedCHROMIUM(Context *context,
                                                         GLsizei numPaths,
                                                         GLenum pathNameType,
                                                         const void *paths,
                                                         GLuint pathBase,
                                                         GLint reference,
                                                         GLuint mask,
                                                         GLenum coverMode,
                                                         GLenum transformType,
                                                         const GLfloat *transformValues)
{
    if (!ValidateInstancedPathParameters(context, numPaths, pathNameType, paths, pathBase,
                                         transformType, transformValues))
        return false;

    switch (coverMode)
    {
        case GL_CONVEX_HULL_CHROMIUM:
        case GL_BOUNDING_BOX_CHROMIUM:
        case GL_BOUNDING_BOX_OF_BOUNDING_BOXES_CHROMIUM:
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidCoverMode);
            return false;
    }

    return true;
}

bool ValidateBindFragmentInputLocationCHROMIUM(Context *context,
                                               GLuint program,
                                               GLint location,
                                               const GLchar *name)
{
    if (!context->getExtensions().pathRendering)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    const GLint MaxLocation = context->getCaps().maxVaryingVectors * 4;
    if (location >= MaxLocation)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidVaryingLocation);
        return false;
    }

    const auto *programObject = context->getProgramNoResolveLink(program);
    if (!programObject)
    {
        context->validationError(GL_INVALID_OPERATION, kProgramNotBound);
        return false;
    }

    if (!name)
    {
        context->validationError(GL_INVALID_VALUE, kMissingName);
        return false;
    }

    if (angle::BeginsWith(name, "gl_"))
    {
        context->validationError(GL_INVALID_OPERATION, kNameBeginsWithGL);
        return false;
    }

    return true;
}

bool ValidateProgramPathFragmentInputGenCHROMIUM(Context *context,
                                                 GLuint program,
                                                 GLint location,
                                                 GLenum genMode,
                                                 GLint components,
                                                 const GLfloat *coeffs)
{
    if (!context->getExtensions().pathRendering)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    const auto *programObject = context->getProgramResolveLink(program);
    if (!programObject || programObject->isFlaggedForDeletion())
    {
        context->validationError(GL_INVALID_OPERATION, kProgramDoesNotExist);
        return false;
    }

    if (!programObject->isLinked())
    {
        context->validationError(GL_INVALID_OPERATION, kProgramNotLinked);
        return false;
    }

    switch (genMode)
    {
        case GL_NONE:
            if (components != 0)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidComponents);
                return false;
            }
            break;

        case GL_OBJECT_LINEAR_CHROMIUM:
        case GL_EYE_LINEAR_CHROMIUM:
        case GL_CONSTANT_CHROMIUM:
            if (components < 1 || components > 4)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidComponents);
                return false;
            }
            if (!coeffs)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidPathCoefficientsArray);
                return false;
            }
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kInvalidPathGenMode);
            return false;
    }

    // If the location is -1 then the command is silently ignored
    // and no further validation is needed.
    if (location == -1)
        return true;

    const auto &binding = programObject->getFragmentInputBindingInfo(location);

    if (!binding.valid)
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidFragmentInputBinding);
        return false;
    }

    if (binding.type != GL_NONE)
    {
        GLint expectedComponents = 0;
        switch (binding.type)
        {
            case GL_FLOAT:
                expectedComponents = 1;
                break;
            case GL_FLOAT_VEC2:
                expectedComponents = 2;
                break;
            case GL_FLOAT_VEC3:
                expectedComponents = 3;
                break;
            case GL_FLOAT_VEC4:
                expectedComponents = 4;
                break;
            default:
                context->validationError(GL_INVALID_OPERATION, kFragmentInputTypeNotFloatingPoint);
                return false;
        }
        if (expectedComponents != components && genMode != GL_NONE)
        {
            context->validationError(GL_INVALID_OPERATION, kInvalidPathComponents);
            return false;
        }
    }
    return true;
}

bool ValidateCopyTextureCHROMIUM(Context *context,
                                 GLuint sourceId,
                                 GLint sourceLevel,
                                 TextureTarget destTarget,
                                 GLuint destId,
                                 GLint destLevel,
                                 GLint internalFormat,
                                 GLenum destType,
                                 GLboolean unpackFlipY,
                                 GLboolean unpackPremultiplyAlpha,
                                 GLboolean unpackUnmultiplyAlpha)
{
    if (!context->getExtensions().copyTexture)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    const Texture *source = context->getTexture(sourceId);
    if (source == nullptr)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidSourceTexture);
        return false;
    }

    if (!IsValidCopyTextureSourceTarget(context, source->getType()))
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidInternalFormat);
        return false;
    }

    TextureType sourceType = source->getType();
    ASSERT(sourceType != TextureType::CubeMap);
    TextureTarget sourceTarget = NonCubeTextureTypeToTarget(sourceType);

    if (!IsValidCopyTextureSourceLevel(context, sourceType, sourceLevel))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidSourceTextureLevel);
        return false;
    }

    GLsizei sourceWidth  = static_cast<GLsizei>(source->getWidth(sourceTarget, sourceLevel));
    GLsizei sourceHeight = static_cast<GLsizei>(source->getHeight(sourceTarget, sourceLevel));
    if (sourceWidth == 0 || sourceHeight == 0)
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidInternalFormat);
        return false;
    }

    const InternalFormat &sourceFormat = *source->getFormat(sourceTarget, sourceLevel).info;
    if (!IsValidCopyTextureSourceInternalFormatEnum(sourceFormat.internalFormat))
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidSourceTextureInternalFormat);
        return false;
    }

    if (!IsValidCopyTextureDestinationTargetEnum(context, destTarget))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidTextureTarget);
        return false;
    }

    const Texture *dest = context->getTexture(destId);
    if (dest == nullptr)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidDestinationTexture);
        return false;
    }

    if (!IsValidCopyTextureDestinationTarget(context, dest->getType(), destTarget))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidDestinationTextureType);
        return false;
    }

    if (!IsValidCopyTextureDestinationLevel(context, dest->getType(), destLevel, sourceWidth,
                                            sourceHeight, false))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidMipLevel);
        return false;
    }

    if (!IsValidCopyTextureDestinationFormatType(context, internalFormat, destType))
    {
        return false;
    }

    if (dest->getType() == TextureType::CubeMap && sourceWidth != sourceHeight)
    {
        context->validationError(GL_INVALID_VALUE, kCubemapFacesEqualDimensions);
        return false;
    }

    if (dest->getImmutableFormat())
    {
        context->validationError(GL_INVALID_OPERATION, kDestinationImmutable);
        return false;
    }

    return true;
}

bool ValidateCopySubTextureCHROMIUM(Context *context,
                                    GLuint sourceId,
                                    GLint sourceLevel,
                                    TextureTarget destTarget,
                                    GLuint destId,
                                    GLint destLevel,
                                    GLint xoffset,
                                    GLint yoffset,
                                    GLint x,
                                    GLint y,
                                    GLsizei width,
                                    GLsizei height,
                                    GLboolean unpackFlipY,
                                    GLboolean unpackPremultiplyAlpha,
                                    GLboolean unpackUnmultiplyAlpha)
{
    if (!context->getExtensions().copyTexture)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    const Texture *source = context->getTexture(sourceId);
    if (source == nullptr)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidSourceTexture);
        return false;
    }

    if (!IsValidCopyTextureSourceTarget(context, source->getType()))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidSourceTextureType);
        return false;
    }

    TextureType sourceType = source->getType();
    ASSERT(sourceType != TextureType::CubeMap);
    TextureTarget sourceTarget = NonCubeTextureTypeToTarget(sourceType);

    if (!IsValidCopyTextureSourceLevel(context, sourceType, sourceLevel))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidMipLevel);
        return false;
    }

    if (source->getWidth(sourceTarget, sourceLevel) == 0 ||
        source->getHeight(sourceTarget, sourceLevel) == 0)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidSourceTextureLevel);
        return false;
    }

    if (x < 0 || y < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeOffset);
        return false;
    }

    if (width < 0 || height < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeSize);
        return false;
    }

    if (static_cast<size_t>(x + width) > source->getWidth(sourceTarget, sourceLevel) ||
        static_cast<size_t>(y + height) > source->getHeight(sourceTarget, sourceLevel))
    {
        context->validationError(GL_INVALID_VALUE, kSourceTextureTooSmall);
        return false;
    }

    const Format &sourceFormat = source->getFormat(sourceTarget, sourceLevel);
    if (!IsValidCopySubTextureSourceInternalFormat(sourceFormat.info->internalFormat))
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidInternalFormat);
        return false;
    }

    if (!IsValidCopyTextureDestinationTargetEnum(context, destTarget))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidTextureTarget);
        return false;
    }

    const Texture *dest = context->getTexture(destId);
    if (dest == nullptr)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidDestinationTexture);
        return false;
    }

    if (!IsValidCopyTextureDestinationTarget(context, dest->getType(), destTarget))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidDestinationTextureType);
        return false;
    }

    if (!IsValidCopyTextureDestinationLevel(context, dest->getType(), destLevel, width, height,
                                            true))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidMipLevel);
        return false;
    }

    if (dest->getWidth(destTarget, destLevel) == 0 || dest->getHeight(destTarget, destLevel) == 0)
    {
        context->validationError(GL_INVALID_OPERATION, kDestinationLevelNotDefined);
        return false;
    }

    const InternalFormat &destFormat = *dest->getFormat(destTarget, destLevel).info;
    if (!IsValidCopySubTextureDestionationInternalFormat(destFormat.internalFormat))
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidFormatCombination);
        return false;
    }

    if (xoffset < 0 || yoffset < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeOffset);
        return false;
    }

    if (static_cast<size_t>(xoffset + width) > dest->getWidth(destTarget, destLevel) ||
        static_cast<size_t>(yoffset + height) > dest->getHeight(destTarget, destLevel))
    {
        context->validationError(GL_INVALID_VALUE, kOffsetOverflow);
        return false;
    }

    return true;
}

bool ValidateCompressedCopyTextureCHROMIUM(Context *context, GLuint sourceId, GLuint destId)
{
    if (!context->getExtensions().copyCompressedTexture)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    const gl::Texture *source = context->getTexture(sourceId);
    if (source == nullptr)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidSourceTexture);
        return false;
    }

    if (source->getType() != TextureType::_2D)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidSourceTextureType);
        return false;
    }

    if (source->getWidth(TextureTarget::_2D, 0) == 0 ||
        source->getHeight(TextureTarget::_2D, 0) == 0)
    {
        context->validationError(GL_INVALID_VALUE, kSourceTextureLevelZeroDefined);
        return false;
    }

    const gl::Format &sourceFormat = source->getFormat(TextureTarget::_2D, 0);
    if (!sourceFormat.info->compressed)
    {
        context->validationError(GL_INVALID_OPERATION, kSourceTextureMustBeCompressed);
        return false;
    }

    const gl::Texture *dest = context->getTexture(destId);
    if (dest == nullptr)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidDestinationTexture);
        return false;
    }

    if (dest->getType() != TextureType::_2D)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidDestinationTextureType);
        return false;
    }

    if (dest->getImmutableFormat())
    {
        context->validationError(GL_INVALID_OPERATION, kDestinationImmutable);
        return false;
    }

    return true;
}

bool ValidateCreateShader(Context *context, ShaderType type)
{
    switch (type)
    {
        case ShaderType::Vertex:
        case ShaderType::Fragment:
            break;

        case ShaderType::Compute:
            if (context->getClientVersion() < Version(3, 1))
            {
                context->validationError(GL_INVALID_ENUM, kES31Required);
                return false;
            }
            break;

        case ShaderType::Geometry:
            if (!context->getExtensions().geometryShader)
            {
                context->validationError(GL_INVALID_ENUM, kInvalidShaderType);
                return false;
            }
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidShaderType);
            return false;
    }

    return true;
}

bool ValidateBufferData(Context *context,
                        BufferBinding target,
                        GLsizeiptr size,
                        const void *data,
                        BufferUsage usage)
{
    if (size < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeSize);
        return false;
    }

    switch (usage)
    {
        case BufferUsage::StreamDraw:
        case BufferUsage::StaticDraw:
        case BufferUsage::DynamicDraw:
            break;

        case BufferUsage::StreamRead:
        case BufferUsage::StaticRead:
        case BufferUsage::DynamicRead:
        case BufferUsage::StreamCopy:
        case BufferUsage::StaticCopy:
        case BufferUsage::DynamicCopy:
            if (context->getClientMajorVersion() < 3)
            {
                context->validationError(GL_INVALID_ENUM, kInvalidBufferUsage);
                return false;
            }
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kInvalidBufferUsage);
            return false;
    }

    if (!context->isValidBufferBinding(target))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidBufferTypes);
        return false;
    }

    Buffer *buffer = context->getState().getTargetBuffer(target);

    if (!buffer)
    {
        context->validationError(GL_INVALID_OPERATION, kBufferNotBound);
        return false;
    }

    if (context->getExtensions().webglCompatibility &&
        buffer->isBoundForTransformFeedbackAndOtherUse())
    {
        context->validationError(GL_INVALID_OPERATION, kBufferBoundForTransformFeedback);
        return false;
    }

    return true;
}

bool ValidateBufferSubData(Context *context,
                           BufferBinding target,
                           GLintptr offset,
                           GLsizeiptr size,
                           const void *data)
{
    if (size < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeSize);
        return false;
    }

    if (offset < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeOffset);
        return false;
    }

    if (!context->isValidBufferBinding(target))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidBufferTypes);
        return false;
    }

    Buffer *buffer = context->getState().getTargetBuffer(target);

    if (!buffer)
    {
        context->validationError(GL_INVALID_OPERATION, kBufferNotBound);
        return false;
    }

    if (buffer->isMapped())
    {
        context->validationError(GL_INVALID_OPERATION, kBufferMapped);
        return false;
    }

    if (context->getExtensions().webglCompatibility &&
        buffer->isBoundForTransformFeedbackAndOtherUse())
    {
        context->validationError(GL_INVALID_OPERATION, kBufferBoundForTransformFeedback);
        return false;
    }

    // Check for possible overflow of size + offset
    angle::CheckedNumeric<size_t> checkedSize(size);
    checkedSize += offset;
    if (!checkedSize.IsValid())
    {
        context->validationError(GL_INVALID_VALUE, kParamOverflow);
        return false;
    }

    if (size + offset > buffer->getSize())
    {
        context->validationError(GL_INVALID_VALUE, kInsufficientBufferSize);
        return false;
    }

    return true;
}

bool ValidateRequestExtensionANGLE(Context *context, const GLchar *name)
{
    if (!context->getExtensions().requestExtension)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (!context->isExtensionRequestable(name))
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotRequestable);
        return false;
    }

    return true;
}

bool ValidateActiveTexture(Context *context, GLenum texture)
{
    if (context->getClientMajorVersion() < 2)
    {
        return ValidateMultitextureUnit(context, texture);
    }

    if (texture < GL_TEXTURE0 ||
        texture > GL_TEXTURE0 + context->getCaps().maxCombinedTextureImageUnits - 1)
    {
        context->validationError(GL_INVALID_ENUM, kInvalidCombinedImageUnit);
        return false;
    }

    return true;
}

bool ValidateAttachShader(Context *context, GLuint program, GLuint shader)
{
    Program *programObject = GetValidProgram(context, program);
    if (!programObject)
    {
        return false;
    }

    Shader *shaderObject = GetValidShader(context, shader);
    if (!shaderObject)
    {
        return false;
    }

    if (programObject->getAttachedShader(shaderObject->getType()))
    {
        context->validationError(GL_INVALID_OPERATION, kShaderAttachmentHasShader);
        return false;
    }

    return true;
}

bool ValidateBindAttribLocation(Context *context, GLuint program, GLuint index, const GLchar *name)
{
    if (index >= MAX_VERTEX_ATTRIBS)
    {
        context->validationError(GL_INVALID_VALUE, kIndexExceedsMaxVertexAttribute);
        return false;
    }

    if (strncmp(name, "gl_", 3) == 0)
    {
        context->validationError(GL_INVALID_OPERATION, kNameBeginsWithGL);
        return false;
    }

    if (context->isWebGL())
    {
        const size_t length = strlen(name);

        if (!IsValidESSLString(name, length))
        {
            // The WebGL spec (section 6.20) disallows strings containing invalid ESSL characters
            // for shader-related entry points
            context->validationError(GL_INVALID_VALUE, kInvalidNameCharacters);
            return false;
        }

        if (!ValidateWebGLNameLength(context, length) || !ValidateWebGLNamePrefix(context, name))
        {
            return false;
        }
    }

    return GetValidProgram(context, program) != nullptr;
}

bool ValidateBindFramebuffer(Context *context, GLenum target, GLuint framebuffer)
{
    if (!ValidFramebufferTarget(context, target))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidFramebufferTarget);
        return false;
    }

    if (!context->getState().isBindGeneratesResourceEnabled() &&
        !context->isFramebufferGenerated(framebuffer))
    {
        context->validationError(GL_INVALID_OPERATION, kObjectNotGenerated);
        return false;
    }

    return true;
}

bool ValidateBindRenderbuffer(Context *context, GLenum target, GLuint renderbuffer)
{
    if (target != GL_RENDERBUFFER)
    {
        context->validationError(GL_INVALID_ENUM, kInvalidRenderbufferTarget);
        return false;
    }

    if (!context->getState().isBindGeneratesResourceEnabled() &&
        !context->isRenderbufferGenerated(renderbuffer))
    {
        context->validationError(GL_INVALID_OPERATION, kObjectNotGenerated);
        return false;
    }

    return true;
}

static bool ValidBlendEquationMode(const Context *context, GLenum mode)
{
    switch (mode)
    {
        case GL_FUNC_ADD:
        case GL_FUNC_SUBTRACT:
        case GL_FUNC_REVERSE_SUBTRACT:
            return true;

        case GL_MIN:
        case GL_MAX:
            return context->getClientVersion() >= ES_3_0 || context->getExtensions().blendMinMax;

        default:
            return false;
    }
}

bool ValidateBlendColor(Context *context, GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha)
{
    return true;
}

bool ValidateBlendEquation(Context *context, GLenum mode)
{
    if (!ValidBlendEquationMode(context, mode))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidBlendEquation);
        return false;
    }

    return true;
}

bool ValidateBlendEquationSeparate(Context *context, GLenum modeRGB, GLenum modeAlpha)
{
    if (!ValidBlendEquationMode(context, modeRGB))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidBlendEquation);
        return false;
    }

    if (!ValidBlendEquationMode(context, modeAlpha))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidBlendEquation);
        return false;
    }

    return true;
}

bool ValidateBlendFunc(Context *context, GLenum sfactor, GLenum dfactor)
{
    return ValidateBlendFuncSeparate(context, sfactor, dfactor, sfactor, dfactor);
}

bool ValidateBlendFuncSeparate(Context *context,
                               GLenum srcRGB,
                               GLenum dstRGB,
                               GLenum srcAlpha,
                               GLenum dstAlpha)
{
    if (!ValidSrcBlendFunc(context, srcRGB))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidBlendFunction);
        return false;
    }

    if (!ValidDstBlendFunc(context, dstRGB))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidBlendFunction);
        return false;
    }

    if (!ValidSrcBlendFunc(context, srcAlpha))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidBlendFunction);
        return false;
    }

    if (!ValidDstBlendFunc(context, dstAlpha))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidBlendFunction);
        return false;
    }

    if (context->getLimitations().noSimultaneousConstantColorAndAlphaBlendFunc ||
        context->getExtensions().webglCompatibility)
    {
        bool constantColorUsed =
            (srcRGB == GL_CONSTANT_COLOR || srcRGB == GL_ONE_MINUS_CONSTANT_COLOR ||
             dstRGB == GL_CONSTANT_COLOR || dstRGB == GL_ONE_MINUS_CONSTANT_COLOR);

        bool constantAlphaUsed =
            (srcRGB == GL_CONSTANT_ALPHA || srcRGB == GL_ONE_MINUS_CONSTANT_ALPHA ||
             dstRGB == GL_CONSTANT_ALPHA || dstRGB == GL_ONE_MINUS_CONSTANT_ALPHA);

        if (constantColorUsed && constantAlphaUsed)
        {
            if (context->getExtensions().webglCompatibility)
            {
                context->validationError(GL_INVALID_OPERATION, kInvalidConstantColor);
                return false;
            }

            WARN() << kConstantColorAlphaLimitation;
            context->validationError(GL_INVALID_OPERATION, kConstantColorAlphaLimitation);
            return false;
        }
    }

    return true;
}

bool ValidateGetString(Context *context, GLenum name)
{
    switch (name)
    {
        case GL_VENDOR:
        case GL_RENDERER:
        case GL_VERSION:
        case GL_SHADING_LANGUAGE_VERSION:
        case GL_EXTENSIONS:
            break;

        case GL_REQUESTABLE_EXTENSIONS_ANGLE:
            if (!context->getExtensions().requestExtension)
            {
                context->validationError(GL_INVALID_ENUM, kInvalidName);
                return false;
            }
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kInvalidName);
            return false;
    }

    return true;
}

bool ValidateLineWidth(Context *context, GLfloat width)
{
    if (width <= 0.0f || isNaN(width))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidWidth);
        return false;
    }

    return true;
}

bool ValidateDepthRangef(Context *context, GLfloat zNear, GLfloat zFar)
{
    if (context->getExtensions().webglCompatibility && zNear > zFar)
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidDepthRange);
        return false;
    }

    return true;
}

bool ValidateRenderbufferStorage(Context *context,
                                 GLenum target,
                                 GLenum internalformat,
                                 GLsizei width,
                                 GLsizei height)
{
    return ValidateRenderbufferStorageParametersBase(context, target, 0, internalformat, width,
                                                     height);
}

bool ValidateRenderbufferStorageMultisampleANGLE(Context *context,
                                                 GLenum target,
                                                 GLsizei samples,
                                                 GLenum internalformat,
                                                 GLsizei width,
                                                 GLsizei height)
{
    if (!context->getExtensions().framebufferMultisample)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    // ANGLE_framebuffer_multisample states that the value of samples must be less than or equal
    // to MAX_SAMPLES_ANGLE (Context::getCaps().maxSamples) otherwise GL_INVALID_VALUE is
    // generated.
    if (static_cast<GLuint>(samples) > context->getCaps().maxSamples)
    {
        context->validationError(GL_INVALID_VALUE, kSamplesOutOfRange);
        return false;
    }

    // ANGLE_framebuffer_multisample states GL_OUT_OF_MEMORY is generated on a failure to create
    // the specified storage. This is different than ES 3.0 in which a sample number higher
    // than the maximum sample number supported by this format generates a GL_INVALID_VALUE.
    // The TextureCaps::getMaxSamples method is only guarenteed to be valid when the context is ES3.
    if (context->getClientMajorVersion() >= 3)
    {
        const TextureCaps &formatCaps = context->getTextureCaps().get(internalformat);
        if (static_cast<GLuint>(samples) > formatCaps.getMaxSamples())
        {
            context->validationError(GL_OUT_OF_MEMORY, kSamplesOutOfRange);
            return false;
        }
    }

    return ValidateRenderbufferStorageParametersBase(context, target, samples, internalformat,
                                                     width, height);
}

bool ValidateCheckFramebufferStatus(Context *context, GLenum target)
{
    if (!ValidFramebufferTarget(context, target))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidFramebufferTarget);
        return false;
    }

    return true;
}

bool ValidateClearColor(Context *context, GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha)
{
    return true;
}

bool ValidateClearDepthf(Context *context, GLfloat depth)
{
    return true;
}

bool ValidateClearStencil(Context *context, GLint s)
{
    return true;
}

bool ValidateColorMask(Context *context,
                       GLboolean red,
                       GLboolean green,
                       GLboolean blue,
                       GLboolean alpha)
{
    return true;
}

bool ValidateCompileShader(Context *context, GLuint shader)
{
    return true;
}

bool ValidateCreateProgram(Context *context)
{
    return true;
}

bool ValidateCullFace(Context *context, CullFaceMode mode)
{
    switch (mode)
    {
        case CullFaceMode::Front:
        case CullFaceMode::Back:
        case CullFaceMode::FrontAndBack:
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kInvalidCullMode);
            return false;
    }

    return true;
}

bool ValidateDeleteProgram(Context *context, GLuint program)
{
    if (program == 0)
    {
        return false;
    }

    if (!context->getProgramResolveLink(program))
    {
        if (context->getShader(program))
        {
            context->validationError(GL_INVALID_OPERATION, kExpectedProgramName);
            return false;
        }
        else
        {
            context->validationError(GL_INVALID_VALUE, kInvalidProgramName);
            return false;
        }
    }

    return true;
}

bool ValidateDeleteShader(Context *context, GLuint shader)
{
    if (shader == 0)
    {
        return false;
    }

    if (!context->getShader(shader))
    {
        if (context->getProgramResolveLink(shader))
        {
            context->validationError(GL_INVALID_OPERATION, kInvalidShaderName);
            return false;
        }
        else
        {
            context->validationError(GL_INVALID_VALUE, kExpectedShaderName);
            return false;
        }
    }

    return true;
}

bool ValidateDepthFunc(Context *context, GLenum func)
{
    switch (func)
    {
        case GL_NEVER:
        case GL_ALWAYS:
        case GL_LESS:
        case GL_LEQUAL:
        case GL_EQUAL:
        case GL_GREATER:
        case GL_GEQUAL:
        case GL_NOTEQUAL:
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
            return false;
    }

    return true;
}

bool ValidateDepthMask(Context *context, GLboolean flag)
{
    return true;
}

bool ValidateDetachShader(Context *context, GLuint program, GLuint shader)
{
    Program *programObject = GetValidProgram(context, program);
    if (!programObject)
    {
        return false;
    }

    Shader *shaderObject = GetValidShader(context, shader);
    if (!shaderObject)
    {
        return false;
    }

    const Shader *attachedShader = programObject->getAttachedShader(shaderObject->getType());
    if (attachedShader != shaderObject)
    {
        context->validationError(GL_INVALID_OPERATION, kShaderToDetachMustBeAttached);
        return false;
    }

    return true;
}

bool ValidateDisableVertexAttribArray(Context *context, GLuint index)
{
    if (index >= MAX_VERTEX_ATTRIBS)
    {
        context->validationError(GL_INVALID_VALUE, kIndexExceedsMaxVertexAttribute);
        return false;
    }

    return true;
}

bool ValidateEnableVertexAttribArray(Context *context, GLuint index)
{
    if (index >= MAX_VERTEX_ATTRIBS)
    {
        context->validationError(GL_INVALID_VALUE, kIndexExceedsMaxVertexAttribute);
        return false;
    }

    return true;
}

bool ValidateFinish(Context *context)
{
    return true;
}

bool ValidateFlush(Context *context)
{
    return true;
}

bool ValidateFrontFace(Context *context, GLenum mode)
{
    switch (mode)
    {
        case GL_CW:
        case GL_CCW:
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
            return false;
    }

    return true;
}

bool ValidateGetActiveAttrib(Context *context,
                             GLuint program,
                             GLuint index,
                             GLsizei bufsize,
                             GLsizei *length,
                             GLint *size,
                             GLenum *type,
                             GLchar *name)
{
    if (bufsize < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeBufferSize);
        return false;
    }

    Program *programObject = GetValidProgram(context, program);

    if (!programObject)
    {
        return false;
    }

    if (index >= static_cast<GLuint>(programObject->getActiveAttributeCount()))
    {
        context->validationError(GL_INVALID_VALUE, kIndexExceedsMaxActiveUniform);
        return false;
    }

    return true;
}

bool ValidateGetActiveUniform(Context *context,
                              GLuint program,
                              GLuint index,
                              GLsizei bufsize,
                              GLsizei *length,
                              GLint *size,
                              GLenum *type,
                              GLchar *name)
{
    if (bufsize < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeBufferSize);
        return false;
    }

    Program *programObject = GetValidProgram(context, program);

    if (!programObject)
    {
        return false;
    }

    if (index >= static_cast<GLuint>(programObject->getActiveUniformCount()))
    {
        context->validationError(GL_INVALID_VALUE, kIndexExceedsMaxActiveUniform);
        return false;
    }

    return true;
}

bool ValidateGetAttachedShaders(Context *context,
                                GLuint program,
                                GLsizei maxcount,
                                GLsizei *count,
                                GLuint *shaders)
{
    if (maxcount < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeMaxCount);
        return false;
    }

    Program *programObject = GetValidProgram(context, program);

    if (!programObject)
    {
        return false;
    }

    return true;
}

bool ValidateGetAttribLocation(Context *context, GLuint program, const GLchar *name)
{
    // The WebGL spec (section 6.20) disallows strings containing invalid ESSL characters for
    // shader-related entry points
    if (context->getExtensions().webglCompatibility && !IsValidESSLString(name, strlen(name)))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidNameCharacters);
        return false;
    }

    Program *programObject = GetValidProgram(context, program);

    if (!programObject)
    {
        context->validationError(GL_INVALID_OPERATION, kProgramNotBound);
        return false;
    }

    if (!programObject->isLinked())
    {
        context->validationError(GL_INVALID_OPERATION, kProgramNotLinked);
        return false;
    }

    return true;
}

bool ValidateGetBooleanv(Context *context, GLenum pname, GLboolean *params)
{
    GLenum nativeType;
    unsigned int numParams = 0;
    return ValidateStateQuery(context, pname, &nativeType, &numParams);
}

bool ValidateGetError(Context *context)
{
    return true;
}

bool ValidateGetFloatv(Context *context, GLenum pname, GLfloat *params)
{
    GLenum nativeType;
    unsigned int numParams = 0;
    return ValidateStateQuery(context, pname, &nativeType, &numParams);
}

bool ValidateGetIntegerv(Context *context, GLenum pname, GLint *params)
{
    GLenum nativeType;
    unsigned int numParams = 0;
    return ValidateStateQuery(context, pname, &nativeType, &numParams);
}

bool ValidateGetProgramInfoLog(Context *context,
                               GLuint program,
                               GLsizei bufsize,
                               GLsizei *length,
                               GLchar *infolog)
{
    if (bufsize < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeBufferSize);
        return false;
    }

    Program *programObject = GetValidProgram(context, program);
    if (!programObject)
    {
        return false;
    }

    return true;
}

bool ValidateGetShaderInfoLog(Context *context,
                              GLuint shader,
                              GLsizei bufsize,
                              GLsizei *length,
                              GLchar *infolog)
{
    if (bufsize < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeBufferSize);
        return false;
    }

    Shader *shaderObject = GetValidShader(context, shader);
    if (!shaderObject)
    {
        return false;
    }

    return true;
}

bool ValidateGetShaderPrecisionFormat(Context *context,
                                      GLenum shadertype,
                                      GLenum precisiontype,
                                      GLint *range,
                                      GLint *precision)
{
    switch (shadertype)
    {
        case GL_VERTEX_SHADER:
        case GL_FRAGMENT_SHADER:
            break;
        case GL_COMPUTE_SHADER:
            context->validationError(GL_INVALID_OPERATION, kUnimplementedComputeShaderPrecision);
            return false;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidShaderType);
            return false;
    }

    switch (precisiontype)
    {
        case GL_LOW_FLOAT:
        case GL_MEDIUM_FLOAT:
        case GL_HIGH_FLOAT:
        case GL_LOW_INT:
        case GL_MEDIUM_INT:
        case GL_HIGH_INT:
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kInvalidPrecision);
            return false;
    }

    return true;
}

bool ValidateGetShaderSource(Context *context,
                             GLuint shader,
                             GLsizei bufsize,
                             GLsizei *length,
                             GLchar *source)
{
    if (bufsize < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeBufferSize);
        return false;
    }

    Shader *shaderObject = GetValidShader(context, shader);
    if (!shaderObject)
    {
        return false;
    }

    return true;
}

bool ValidateGetUniformLocation(Context *context, GLuint program, const GLchar *name)
{
    if (strstr(name, "gl_") == name)
    {
        return false;
    }

    // The WebGL spec (section 6.20) disallows strings containing invalid ESSL characters for
    // shader-related entry points
    if (context->getExtensions().webglCompatibility && !IsValidESSLString(name, strlen(name)))
    {
        context->validationError(GL_INVALID_VALUE, kInvalidNameCharacters);
        return false;
    }

    Program *programObject = GetValidProgram(context, program);

    if (!programObject)
    {
        return false;
    }

    if (!programObject->isLinked())
    {
        context->validationError(GL_INVALID_OPERATION, kProgramNotLinked);
        return false;
    }

    return true;
}

bool ValidateHint(Context *context, GLenum target, GLenum mode)
{
    switch (mode)
    {
        case GL_FASTEST:
        case GL_NICEST:
        case GL_DONT_CARE:
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
            return false;
    }

    switch (target)
    {
        case GL_GENERATE_MIPMAP_HINT:
            break;

        case GL_FRAGMENT_SHADER_DERIVATIVE_HINT:
            if (context->getClientVersion() < ES_3_0 &&
                !context->getExtensions().standardDerivatives)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
            break;

        case GL_PERSPECTIVE_CORRECTION_HINT:
        case GL_POINT_SMOOTH_HINT:
        case GL_LINE_SMOOTH_HINT:
        case GL_FOG_HINT:
            if (context->getClientMajorVersion() >= 2)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
                return false;
            }
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
            return false;
    }

    return true;
}

bool ValidateIsBuffer(Context *context, GLuint buffer)
{
    return true;
}

bool ValidateIsFramebuffer(Context *context, GLuint framebuffer)
{
    return true;
}

bool ValidateIsProgram(Context *context, GLuint program)
{
    return true;
}

bool ValidateIsRenderbuffer(Context *context, GLuint renderbuffer)
{
    return true;
}

bool ValidateIsShader(Context *context, GLuint shader)
{
    return true;
}

bool ValidateIsTexture(Context *context, GLuint texture)
{
    return true;
}

bool ValidatePixelStorei(Context *context, GLenum pname, GLint param)
{
    if (context->getClientMajorVersion() < 3)
    {
        switch (pname)
        {
            case GL_UNPACK_IMAGE_HEIGHT:
            case GL_UNPACK_SKIP_IMAGES:
                context->validationError(GL_INVALID_ENUM, kInvalidPname);
                return false;

            case GL_UNPACK_ROW_LENGTH:
            case GL_UNPACK_SKIP_ROWS:
            case GL_UNPACK_SKIP_PIXELS:
                if (!context->getExtensions().unpackSubimage)
                {
                    context->validationError(GL_INVALID_ENUM, kInvalidPname);
                    return false;
                }
                break;

            case GL_PACK_ROW_LENGTH:
            case GL_PACK_SKIP_ROWS:
            case GL_PACK_SKIP_PIXELS:
                if (!context->getExtensions().packSubimage)
                {
                    context->validationError(GL_INVALID_ENUM, kInvalidPname);
                    return false;
                }
                break;
        }
    }

    if (param < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeParam);
        return false;
    }

    switch (pname)
    {
        case GL_UNPACK_ALIGNMENT:
            if (param != 1 && param != 2 && param != 4 && param != 8)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidUnpackAlignment);
                return false;
            }
            break;

        case GL_PACK_ALIGNMENT:
            if (param != 1 && param != 2 && param != 4 && param != 8)
            {
                context->validationError(GL_INVALID_VALUE, kInvalidUnpackAlignment);
                return false;
            }
            break;

        case GL_PACK_REVERSE_ROW_ORDER_ANGLE:
            if (!context->getExtensions().packReverseRowOrder)
            {
                context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
            }
            break;

        case GL_UNPACK_ROW_LENGTH:
        case GL_UNPACK_IMAGE_HEIGHT:
        case GL_UNPACK_SKIP_IMAGES:
        case GL_UNPACK_SKIP_ROWS:
        case GL_UNPACK_SKIP_PIXELS:
        case GL_PACK_ROW_LENGTH:
        case GL_PACK_SKIP_ROWS:
        case GL_PACK_SKIP_PIXELS:
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
            return false;
    }

    return true;
}

bool ValidatePolygonOffset(Context *context, GLfloat factor, GLfloat units)
{
    return true;
}

bool ValidateReleaseShaderCompiler(Context *context)
{
    return true;
}

bool ValidateSampleCoverage(Context *context, GLfloat value, GLboolean invert)
{
    return true;
}

bool ValidateScissor(Context *context, GLint x, GLint y, GLsizei width, GLsizei height)
{
    if (width < 0 || height < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeSize);
        return false;
    }

    return true;
}

bool ValidateShaderBinary(Context *context,
                          GLsizei n,
                          const GLuint *shaders,
                          GLenum binaryformat,
                          const void *binary,
                          GLsizei length)
{
    const std::vector<GLenum> &shaderBinaryFormats = context->getCaps().shaderBinaryFormats;
    if (std::find(shaderBinaryFormats.begin(), shaderBinaryFormats.end(), binaryformat) ==
        shaderBinaryFormats.end())
    {
        context->validationError(GL_INVALID_ENUM, kInvalidShaderBinaryFormat);
        return false;
    }

    return true;
}

bool ValidateShaderSource(Context *context,
                          GLuint shader,
                          GLsizei count,
                          const GLchar *const *string,
                          const GLint *length)
{
    if (count < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeCount);
        return false;
    }

    // The WebGL spec (section 6.20) disallows strings containing invalid ESSL characters for
    // shader-related entry points
    if (context->getExtensions().webglCompatibility)
    {
        for (GLsizei i = 0; i < count; i++)
        {
            size_t len =
                (length && length[i] >= 0) ? static_cast<size_t>(length[i]) : strlen(string[i]);

            // Backslash as line-continuation is allowed in WebGL 2.0.
            if (!IsValidESSLShaderSourceString(string[i], len,
                                               context->getClientVersion() >= ES_3_0))
            {
                context->validationError(GL_INVALID_VALUE, kShaderSourceInvalidCharacters);
                return false;
            }
        }
    }

    Shader *shaderObject = GetValidShader(context, shader);
    if (!shaderObject)
    {
        return false;
    }

    return true;
}

bool ValidateStencilFunc(Context *context, GLenum func, GLint ref, GLuint mask)
{
    if (!IsValidStencilFunc(func))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidStencil);
        return false;
    }

    return true;
}

bool ValidateStencilFuncSeparate(Context *context, GLenum face, GLenum func, GLint ref, GLuint mask)
{
    if (!IsValidStencilFace(face))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidStencil);
        return false;
    }

    if (!IsValidStencilFunc(func))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidStencil);
        return false;
    }

    return true;
}

bool ValidateStencilMask(Context *context, GLuint mask)
{
    return true;
}

bool ValidateStencilMaskSeparate(Context *context, GLenum face, GLuint mask)
{
    if (!IsValidStencilFace(face))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidStencil);
        return false;
    }

    return true;
}

bool ValidateStencilOp(Context *context, GLenum fail, GLenum zfail, GLenum zpass)
{
    if (!IsValidStencilOp(fail))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidStencil);
        return false;
    }

    if (!IsValidStencilOp(zfail))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidStencil);
        return false;
    }

    if (!IsValidStencilOp(zpass))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidStencil);
        return false;
    }

    return true;
}

bool ValidateStencilOpSeparate(Context *context,
                               GLenum face,
                               GLenum fail,
                               GLenum zfail,
                               GLenum zpass)
{
    if (!IsValidStencilFace(face))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidStencil);
        return false;
    }

    return ValidateStencilOp(context, fail, zfail, zpass);
}

bool ValidateUniform1f(Context *context, GLint location, GLfloat x)
{
    return ValidateUniform(context, GL_FLOAT, location, 1);
}

bool ValidateUniform1fv(Context *context, GLint location, GLsizei count, const GLfloat *v)
{
    return ValidateUniform(context, GL_FLOAT, location, count);
}

bool ValidateUniform1i(Context *context, GLint location, GLint x)
{
    return ValidateUniform1iv(context, location, 1, &x);
}

bool ValidateUniform2fv(Context *context, GLint location, GLsizei count, const GLfloat *v)
{
    return ValidateUniform(context, GL_FLOAT_VEC2, location, count);
}

bool ValidateUniform2i(Context *context, GLint location, GLint x, GLint y)
{
    return ValidateUniform(context, GL_INT_VEC2, location, 1);
}

bool ValidateUniform2iv(Context *context, GLint location, GLsizei count, const GLint *v)
{
    return ValidateUniform(context, GL_INT_VEC2, location, count);
}

bool ValidateUniform3f(Context *context, GLint location, GLfloat x, GLfloat y, GLfloat z)
{
    return ValidateUniform(context, GL_FLOAT_VEC3, location, 1);
}

bool ValidateUniform3fv(Context *context, GLint location, GLsizei count, const GLfloat *v)
{
    return ValidateUniform(context, GL_FLOAT_VEC3, location, count);
}

bool ValidateUniform3i(Context *context, GLint location, GLint x, GLint y, GLint z)
{
    return ValidateUniform(context, GL_INT_VEC3, location, 1);
}

bool ValidateUniform3iv(Context *context, GLint location, GLsizei count, const GLint *v)
{
    return ValidateUniform(context, GL_INT_VEC3, location, count);
}

bool ValidateUniform4f(Context *context, GLint location, GLfloat x, GLfloat y, GLfloat z, GLfloat w)
{
    return ValidateUniform(context, GL_FLOAT_VEC4, location, 1);
}

bool ValidateUniform4fv(Context *context, GLint location, GLsizei count, const GLfloat *v)
{
    return ValidateUniform(context, GL_FLOAT_VEC4, location, count);
}

bool ValidateUniform4i(Context *context, GLint location, GLint x, GLint y, GLint z, GLint w)
{
    return ValidateUniform(context, GL_INT_VEC4, location, 1);
}

bool ValidateUniform4iv(Context *context, GLint location, GLsizei count, const GLint *v)
{
    return ValidateUniform(context, GL_INT_VEC4, location, count);
}

bool ValidateUniformMatrix2fv(Context *context,
                              GLint location,
                              GLsizei count,
                              GLboolean transpose,
                              const GLfloat *value)
{
    return ValidateUniformMatrix(context, GL_FLOAT_MAT2, location, count, transpose);
}

bool ValidateUniformMatrix3fv(Context *context,
                              GLint location,
                              GLsizei count,
                              GLboolean transpose,
                              const GLfloat *value)
{
    return ValidateUniformMatrix(context, GL_FLOAT_MAT3, location, count, transpose);
}

bool ValidateUniformMatrix4fv(Context *context,
                              GLint location,
                              GLsizei count,
                              GLboolean transpose,
                              const GLfloat *value)
{
    return ValidateUniformMatrix(context, GL_FLOAT_MAT4, location, count, transpose);
}

bool ValidateValidateProgram(Context *context, GLuint program)
{
    Program *programObject = GetValidProgram(context, program);

    if (!programObject)
    {
        return false;
    }

    return true;
}

bool ValidateVertexAttrib1f(Context *context, GLuint index, GLfloat x)
{
    return ValidateVertexAttribIndex(context, index);
}

bool ValidateVertexAttrib1fv(Context *context, GLuint index, const GLfloat *values)
{
    return ValidateVertexAttribIndex(context, index);
}

bool ValidateVertexAttrib2f(Context *context, GLuint index, GLfloat x, GLfloat y)
{
    return ValidateVertexAttribIndex(context, index);
}

bool ValidateVertexAttrib2fv(Context *context, GLuint index, const GLfloat *values)
{
    return ValidateVertexAttribIndex(context, index);
}

bool ValidateVertexAttrib3f(Context *context, GLuint index, GLfloat x, GLfloat y, GLfloat z)
{
    return ValidateVertexAttribIndex(context, index);
}

bool ValidateVertexAttrib3fv(Context *context, GLuint index, const GLfloat *values)
{
    return ValidateVertexAttribIndex(context, index);
}

bool ValidateVertexAttrib4f(Context *context,
                            GLuint index,
                            GLfloat x,
                            GLfloat y,
                            GLfloat z,
                            GLfloat w)
{
    return ValidateVertexAttribIndex(context, index);
}

bool ValidateVertexAttrib4fv(Context *context, GLuint index, const GLfloat *values)
{
    return ValidateVertexAttribIndex(context, index);
}

bool ValidateViewport(Context *context, GLint x, GLint y, GLsizei width, GLsizei height)
{
    if (width < 0 || height < 0)
    {
        context->validationError(GL_INVALID_VALUE, kViewportNegativeSize);
        return false;
    }

    return true;
}

bool ValidateGetFramebufferAttachmentParameteriv(Context *context,
                                                 GLenum target,
                                                 GLenum attachment,
                                                 GLenum pname,
                                                 GLint *params)
{
    return ValidateGetFramebufferAttachmentParameterivBase(context, target, attachment, pname,
                                                           nullptr);
}

bool ValidateGetProgramiv(Context *context, GLuint program, GLenum pname, GLint *params)
{
    return ValidateGetProgramivBase(context, program, pname, nullptr);
}

bool ValidateCopyTexImage2D(Context *context,
                            TextureTarget target,
                            GLint level,
                            GLenum internalformat,
                            GLint x,
                            GLint y,
                            GLsizei width,
                            GLsizei height,
                            GLint border)
{
    if (context->getClientMajorVersion() < 3)
    {
        return ValidateES2CopyTexImageParameters(context, target, level, internalformat, false, 0,
                                                 0, x, y, width, height, border);
    }

    ASSERT(context->getClientMajorVersion() == 3);
    return ValidateES3CopyTexImage2DParameters(context, target, level, internalformat, false, 0, 0,
                                               0, x, y, width, height, border);
}

bool ValidateCopyTexSubImage2D(Context *context,
                               TextureTarget target,
                               GLint level,
                               GLint xoffset,
                               GLint yoffset,
                               GLint x,
                               GLint y,
                               GLsizei width,
                               GLsizei height)
{
    if (context->getClientMajorVersion() < 3)
    {
        return ValidateES2CopyTexImageParameters(context, target, level, GL_NONE, true, xoffset,
                                                 yoffset, x, y, width, height, 0);
    }

    return ValidateES3CopyTexImage2DParameters(context, target, level, GL_NONE, true, xoffset,
                                               yoffset, 0, x, y, width, height, 0);
}

bool ValidateDeleteBuffers(Context *context, GLint n, const GLuint *)
{
    return ValidateGenOrDelete(context, n);
}

bool ValidateDeleteFramebuffers(Context *context, GLint n, const GLuint *)
{
    return ValidateGenOrDelete(context, n);
}

bool ValidateDeleteRenderbuffers(Context *context, GLint n, const GLuint *)
{
    return ValidateGenOrDelete(context, n);
}

bool ValidateDeleteTextures(Context *context, GLint n, const GLuint *)
{
    return ValidateGenOrDelete(context, n);
}

bool ValidateDisable(Context *context, GLenum cap)
{
    if (!ValidCap(context, cap, false))
    {
        context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
        return false;
    }

    return true;
}

bool ValidateEnable(Context *context, GLenum cap)
{
    if (!ValidCap(context, cap, false))
    {
        context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
        return false;
    }

    if (context->getLimitations().noSampleAlphaToCoverageSupport &&
        cap == GL_SAMPLE_ALPHA_TO_COVERAGE)
    {
        context->validationError(GL_INVALID_OPERATION, kNoSampleAlphaToCoveragesLimitation);

        // We also output an error message to the debugger window if tracing is active, so that
        // developers can see the error message.
        ERR() << kNoSampleAlphaToCoveragesLimitation;
        return false;
    }

    return true;
}

bool ValidateFramebufferRenderbuffer(Context *context,
                                     GLenum target,
                                     GLenum attachment,
                                     GLenum renderbuffertarget,
                                     GLuint renderbuffer)
{
    if (!ValidFramebufferTarget(context, target))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidFramebufferTarget);
        return false;
    }

    if (renderbuffertarget != GL_RENDERBUFFER && renderbuffer != 0)
    {
        context->validationError(GL_INVALID_ENUM, kInvalidRenderbufferTarget);
        return false;
    }

    return ValidateFramebufferRenderbufferParameters(context, target, attachment,
                                                     renderbuffertarget, renderbuffer);
}

bool ValidateFramebufferTexture2D(Context *context,
                                  GLenum target,
                                  GLenum attachment,
                                  TextureTarget textarget,
                                  GLuint texture,
                                  GLint level)
{
    // Attachments are required to be bound to level 0 without ES3 or the GL_OES_fbo_render_mipmap
    // extension
    if (context->getClientMajorVersion() < 3 && !context->getExtensions().fboRenderMipmap &&
        level != 0)
    {
        context->validationError(GL_INVALID_VALUE, kInvalidFramebufferTextureLevel);
        return false;
    }

    if (!ValidateFramebufferTextureBase(context, target, attachment, texture, level))
    {
        return false;
    }

    if (texture != 0)
    {
        gl::Texture *tex = context->getTexture(texture);
        ASSERT(tex);

        const gl::Caps &caps = context->getCaps();

        switch (textarget)
        {
            case TextureTarget::_2D:
            {
                if (level > gl::log2(caps.max2DTextureSize))
                {
                    context->validationError(GL_INVALID_VALUE, kInvalidMipLevel);
                    return false;
                }
                if (tex->getType() != TextureType::_2D)
                {
                    context->validationError(GL_INVALID_OPERATION, kInvalidTextureTarget);
                    return false;
                }
            }
            break;

            case TextureTarget::Rectangle:
            {
                if (level != 0)
                {
                    context->validationError(GL_INVALID_VALUE, kInvalidMipLevel);
                    return false;
                }
                if (tex->getType() != TextureType::Rectangle)
                {
                    context->validationError(GL_INVALID_OPERATION, kTextureTargetMismatch);
                    return false;
                }
            }
            break;

            case TextureTarget::CubeMapNegativeX:
            case TextureTarget::CubeMapNegativeY:
            case TextureTarget::CubeMapNegativeZ:
            case TextureTarget::CubeMapPositiveX:
            case TextureTarget::CubeMapPositiveY:
            case TextureTarget::CubeMapPositiveZ:
            {
                if (level > gl::log2(caps.maxCubeMapTextureSize))
                {
                    context->validationError(GL_INVALID_VALUE, kInvalidMipLevel);
                    return false;
                }
                if (tex->getType() != TextureType::CubeMap)
                {
                    context->validationError(GL_INVALID_OPERATION, kTextureTargetMismatch);
                    return false;
                }
            }
            break;

            case TextureTarget::_2DMultisample:
            {
                if (context->getClientVersion() < ES_3_1 &&
                    !context->getExtensions().textureMultisample)
                {
                    context->validationError(GL_INVALID_OPERATION,
                                             kMultisampleTextureExtensionOrES31Required);
                    return false;
                }

                if (level != 0)
                {
                    context->validationError(GL_INVALID_VALUE, kLevelNotZero);
                    return false;
                }
                if (tex->getType() != TextureType::_2DMultisample)
                {
                    context->validationError(GL_INVALID_OPERATION, kTextureTargetMismatch);
                    return false;
                }
            }
            break;

            default:
                context->validationError(GL_INVALID_ENUM, kInvalidTextureTarget);
                return false;
        }
    }

    return true;
}

bool ValidateGenBuffers(Context *context, GLint n, GLuint *)
{
    return ValidateGenOrDelete(context, n);
}

bool ValidateGenFramebuffers(Context *context, GLint n, GLuint *)
{
    return ValidateGenOrDelete(context, n);
}

bool ValidateGenRenderbuffers(Context *context, GLint n, GLuint *)
{
    return ValidateGenOrDelete(context, n);
}

bool ValidateGenTextures(Context *context, GLint n, GLuint *)
{
    return ValidateGenOrDelete(context, n);
}

bool ValidateGenerateMipmap(Context *context, TextureType target)
{
    if (!ValidTextureTarget(context, target))
    {
        context->validationError(GL_INVALID_ENUM, kInvalidTextureTarget);
        return false;
    }

    Texture *texture = context->getTextureByType(target);

    if (texture == nullptr)
    {
        context->validationError(GL_INVALID_OPERATION, kTextureNotBound);
        return false;
    }

    const GLuint effectiveBaseLevel = texture->getTextureState().getEffectiveBaseLevel();

    // This error isn't spelled out in the spec in a very explicit way, but we interpret the spec so
    // that out-of-range base level has a non-color-renderable / non-texture-filterable format.
    if (effectiveBaseLevel >= gl::IMPLEMENTATION_MAX_TEXTURE_LEVELS)
    {
        context->validationError(GL_INVALID_OPERATION, kBaseLevelOutOfRange);
        return false;
    }

    TextureTarget baseTarget = (target == TextureType::CubeMap)
                                   ? TextureTarget::CubeMapPositiveX
                                   : NonCubeTextureTypeToTarget(target);
    const auto &format = *(texture->getFormat(baseTarget, effectiveBaseLevel).info);
    if (format.sizedInternalFormat == GL_NONE || format.compressed || format.depthBits > 0 ||
        format.stencilBits > 0)
    {
        context->validationError(GL_INVALID_OPERATION, kGenerateMipmapNotAllowed);
        return false;
    }

    // GenerateMipmap accepts formats that are unsized or both color renderable and filterable.
    bool formatUnsized = !format.sized;
    bool formatColorRenderableAndFilterable =
        format.filterSupport(context->getClientVersion(), context->getExtensions()) &&
        format.textureAttachmentSupport(context->getClientVersion(), context->getExtensions());
    if (!formatUnsized && !formatColorRenderableAndFilterable)
    {
        context->validationError(GL_INVALID_OPERATION, kGenerateMipmapNotAllowed);
        return false;
    }

    // GL_EXT_sRGB adds an unsized SRGB (no alpha) format which has explicitly disabled mipmap
    // generation
    if (format.colorEncoding == GL_SRGB && format.format == GL_RGB)
    {
        context->validationError(GL_INVALID_OPERATION, kGenerateMipmapNotAllowed);
        return false;
    }

    // According to the OpenGL extension spec EXT_sRGB.txt, EXT_SRGB is based on ES 2.0 and
    // generateMipmap is not allowed if texture format is SRGB_EXT or SRGB_ALPHA_EXT.
    if (context->getClientVersion() < Version(3, 0) && format.colorEncoding == GL_SRGB)
    {
        context->validationError(GL_INVALID_OPERATION, kGenerateMipmapNotAllowed);
        return false;
    }

    // Non-power of 2 ES2 check
    if (context->getClientVersion() < Version(3, 0) && !context->getExtensions().textureNPOT &&
        (!isPow2(static_cast<int>(texture->getWidth(baseTarget, 0))) ||
         !isPow2(static_cast<int>(texture->getHeight(baseTarget, 0)))))
    {
        ASSERT(target == TextureType::_2D || target == TextureType::Rectangle ||
               target == TextureType::CubeMap);
        context->validationError(GL_INVALID_OPERATION, kTextureNotPow2);
        return false;
    }

    // Cube completeness check
    if (target == TextureType::CubeMap && !texture->getTextureState().isCubeComplete())
    {
        context->validationError(GL_INVALID_OPERATION, kCubemapIncomplete);
        return false;
    }

    if (context->getExtensions().webglCompatibility &&
        (texture->getWidth(baseTarget, effectiveBaseLevel) == 0 ||
         texture->getHeight(baseTarget, effectiveBaseLevel) == 0))
    {
        context->validationError(GL_INVALID_OPERATION, kGenerateMipmapZeroSize);
        return false;
    }

    return true;
}

bool ValidateGetBufferParameteriv(Context *context,
                                  BufferBinding target,
                                  GLenum pname,
                                  GLint *params)
{
    return ValidateGetBufferParameterBase(context, target, pname, false, nullptr);
}

bool ValidateGetRenderbufferParameteriv(Context *context,
                                        GLenum target,
                                        GLenum pname,
                                        GLint *params)
{
    return ValidateGetRenderbufferParameterivBase(context, target, pname, nullptr);
}

bool ValidateGetShaderiv(Context *context, GLuint shader, GLenum pname, GLint *params)
{
    return ValidateGetShaderivBase(context, shader, pname, nullptr);
}

bool ValidateGetTexParameterfv(Context *context, TextureType target, GLenum pname, GLfloat *params)
{
    return ValidateGetTexParameterBase(context, target, pname, nullptr);
}

bool ValidateGetTexParameteriv(Context *context, TextureType target, GLenum pname, GLint *params)
{
    return ValidateGetTexParameterBase(context, target, pname, nullptr);
}

bool ValidateGetTexParameterIivOES(Context *context,
                                   TextureType target,
                                   GLenum pname,
                                   GLint *params)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->validationError(GL_INVALID_OPERATION, kES3Required);
        return false;
    }
    return ValidateGetTexParameterBase(context, target, pname, nullptr);
}

bool ValidateGetTexParameterIuivOES(Context *context,
                                    TextureType target,
                                    GLenum pname,
                                    GLuint *params)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->validationError(GL_INVALID_OPERATION, kES3Required);
        return false;
    }
    return ValidateGetTexParameterBase(context, target, pname, nullptr);
}

bool ValidateGetUniformfv(Context *context, GLuint program, GLint location, GLfloat *params)
{
    return ValidateGetUniformBase(context, program, location);
}

bool ValidateGetUniformiv(Context *context, GLuint program, GLint location, GLint *params)
{
    return ValidateGetUniformBase(context, program, location);
}

bool ValidateGetVertexAttribfv(Context *context, GLuint index, GLenum pname, GLfloat *params)
{
    return ValidateGetVertexAttribBase(context, index, pname, nullptr, false, false);
}

bool ValidateGetVertexAttribiv(Context *context, GLuint index, GLenum pname, GLint *params)
{
    return ValidateGetVertexAttribBase(context, index, pname, nullptr, false, false);
}

bool ValidateGetVertexAttribPointerv(Context *context, GLuint index, GLenum pname, void **pointer)
{
    return ValidateGetVertexAttribBase(context, index, pname, nullptr, true, false);
}

bool ValidateIsEnabled(Context *context, GLenum cap)
{
    if (!ValidCap(context, cap, true))
    {
        context->validationError(GL_INVALID_ENUM, kEnumNotSupported);
        return false;
    }

    return true;
}

bool ValidateLinkProgram(Context *context, GLuint program)
{
    if (context->hasActiveTransformFeedback(program))
    {
        // ES 3.0.4 section 2.15 page 91
        context->validationError(GL_INVALID_OPERATION, kTransformFeedbackActiveDuringLink);
        return false;
    }

    Program *programObject = GetValidProgram(context, program);
    if (!programObject)
    {
        return false;
    }

    return true;
}

bool ValidateReadPixels(Context *context,
                        GLint x,
                        GLint y,
                        GLsizei width,
                        GLsizei height,
                        GLenum format,
                        GLenum type,
                        void *pixels)
{
    return ValidateReadPixelsBase(context, x, y, width, height, format, type, -1, nullptr, nullptr,
                                  nullptr, pixels);
}

bool ValidateTexParameterf(Context *context, TextureType target, GLenum pname, GLfloat param)
{
    return ValidateTexParameterBase(context, target, pname, -1, false, &param);
}

bool ValidateTexParameterfv(Context *context,
                            TextureType target,
                            GLenum pname,
                            const GLfloat *params)
{
    return ValidateTexParameterBase(context, target, pname, -1, true, params);
}

bool ValidateTexParameteri(Context *context, TextureType target, GLenum pname, GLint param)
{
    return ValidateTexParameterBase(context, target, pname, -1, false, &param);
}

bool ValidateTexParameteriv(Context *context, TextureType target, GLenum pname, const GLint *params)
{
    return ValidateTexParameterBase(context, target, pname, -1, true, params);
}

bool ValidateTexParameterIivOES(Context *context,
                                TextureType target,
                                GLenum pname,
                                const GLint *params)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->validationError(GL_INVALID_OPERATION, kES3Required);
        return false;
    }
    return ValidateTexParameterBase(context, target, pname, -1, true, params);
}

bool ValidateTexParameterIuivOES(Context *context,
                                 TextureType target,
                                 GLenum pname,
                                 const GLuint *params)
{
    if (context->getClientMajorVersion() < 3)
    {
        context->validationError(GL_INVALID_OPERATION, kES3Required);
        return false;
    }
    return ValidateTexParameterBase(context, target, pname, -1, true, params);
}

bool ValidateUseProgram(Context *context, GLuint program)
{
    if (program != 0)
    {
        Program *programObject = context->getProgramResolveLink(program);
        if (!programObject)
        {
            // ES 3.1.0 section 7.3 page 72
            if (context->getShader(program))
            {
                context->validationError(GL_INVALID_OPERATION, kExpectedProgramName);
                return false;
            }
            else
            {
                context->validationError(GL_INVALID_VALUE, kInvalidProgramName);
                return false;
            }
        }
        if (!programObject->isLinked())
        {
            context->validationError(GL_INVALID_OPERATION, kProgramNotLinked);
            return false;
        }
    }
    if (context->getState().isTransformFeedbackActiveUnpaused())
    {
        // ES 3.0.4 section 2.15 page 91
        context->validationError(GL_INVALID_OPERATION, kTransformFeedbackUseProgram);
        return false;
    }

    return true;
}

bool ValidateDeleteFencesNV(Context *context, GLsizei n, const GLuint *fences)
{
    if (!context->getExtensions().fence)
    {
        context->validationError(GL_INVALID_OPERATION, kNVFenceNotSupported);
        return false;
    }

    if (n < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeCount);
        return false;
    }

    return true;
}

bool ValidateFinishFenceNV(Context *context, GLuint fence)
{
    if (!context->getExtensions().fence)
    {
        context->validationError(GL_INVALID_OPERATION, kNVFenceNotSupported);
        return false;
    }

    FenceNV *fenceObject = context->getFenceNV(fence);

    if (fenceObject == nullptr)
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidFence);
        return false;
    }

    if (!fenceObject->isSet())
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidFenceState);
        return false;
    }

    return true;
}

bool ValidateGenFencesNV(Context *context, GLsizei n, GLuint *fences)
{
    if (!context->getExtensions().fence)
    {
        context->validationError(GL_INVALID_OPERATION, kNVFenceNotSupported);
        return false;
    }

    if (n < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeCount);
        return false;
    }

    return true;
}

bool ValidateGetFenceivNV(Context *context, GLuint fence, GLenum pname, GLint *params)
{
    if (!context->getExtensions().fence)
    {
        context->validationError(GL_INVALID_OPERATION, kNVFenceNotSupported);
        return false;
    }

    FenceNV *fenceObject = context->getFenceNV(fence);

    if (fenceObject == nullptr)
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidFence);
        return false;
    }

    if (!fenceObject->isSet())
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidFenceState);
        return false;
    }

    switch (pname)
    {
        case GL_FENCE_STATUS_NV:
        case GL_FENCE_CONDITION_NV:
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kInvalidPname);
            return false;
    }

    return true;
}

bool ValidateGetGraphicsResetStatusEXT(Context *context)
{
    if (!context->getExtensions().robustness)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return true;
}

bool ValidateGetTranslatedShaderSourceANGLE(Context *context,
                                            GLuint shader,
                                            GLsizei bufsize,
                                            GLsizei *length,
                                            GLchar *source)
{
    if (!context->getExtensions().translatedShaderSource)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (bufsize < 0)
    {
        context->validationError(GL_INVALID_VALUE, kNegativeBufferSize);
        return false;
    }

    Shader *shaderObject = context->getShader(shader);

    if (!shaderObject)
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidShaderName);
        return false;
    }

    return true;
}

bool ValidateIsFenceNV(Context *context, GLuint fence)
{
    if (!context->getExtensions().fence)
    {
        context->validationError(GL_INVALID_OPERATION, kNVFenceNotSupported);
        return false;
    }

    return true;
}

bool ValidateSetFenceNV(Context *context, GLuint fence, GLenum condition)
{
    if (!context->getExtensions().fence)
    {
        context->validationError(GL_INVALID_OPERATION, kNVFenceNotSupported);
        return false;
    }

    if (condition != GL_ALL_COMPLETED_NV)
    {
        context->validationError(GL_INVALID_ENUM, kInvalidFenceCondition);
        return false;
    }

    FenceNV *fenceObject = context->getFenceNV(fence);

    if (fenceObject == nullptr)
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidFence);
        return false;
    }

    return true;
}

bool ValidateTestFenceNV(Context *context, GLuint fence)
{
    if (!context->getExtensions().fence)
    {
        context->validationError(GL_INVALID_OPERATION, kNVFenceNotSupported);
        return false;
    }

    FenceNV *fenceObject = context->getFenceNV(fence);

    if (fenceObject == nullptr)
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidFence);
        return false;
    }

    if (fenceObject->isSet() != GL_TRUE)
    {
        context->validationError(GL_INVALID_OPERATION, kInvalidFenceState);
        return false;
    }

    return true;
}

bool ValidateTexStorage2DEXT(Context *context,
                             TextureType type,
                             GLsizei levels,
                             GLenum internalformat,
                             GLsizei width,
                             GLsizei height)
{
    if (!context->getExtensions().textureStorage)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (context->getClientMajorVersion() < 3)
    {
        return ValidateES2TexStorageParameters(context, type, levels, internalformat, width,
                                               height);
    }

    ASSERT(context->getClientMajorVersion() >= 3);
    return ValidateES3TexStorage2DParameters(context, type, levels, internalformat, width, height,
                                             1);
}

bool ValidateVertexAttribDivisorANGLE(Context *context, GLuint index, GLuint divisor)
{
    if (!context->getExtensions().instancedArraysANGLE)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (index >= MAX_VERTEX_ATTRIBS)
    {
        context->validationError(GL_INVALID_VALUE, kIndexExceedsMaxVertexAttribute);
        return false;
    }

    if (context->getLimitations().attributeZeroRequiresZeroDivisorInEXT)
    {
        if (index == 0 && divisor != 0)
        {
            context->validationError(GL_INVALID_OPERATION, kAttributeZeroRequiresDivisorLimitation);

            // We also output an error message to the debugger window if tracing is active, so
            // that developers can see the error message.
            ERR() << kAttributeZeroRequiresDivisorLimitation;
            return false;
        }
    }

    return true;
}

bool ValidateVertexAttribDivisorEXT(Context *context, GLuint index, GLuint divisor)
{
    if (!context->getExtensions().instancedArraysEXT)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (index >= MAX_VERTEX_ATTRIBS)
    {
        context->validationError(GL_INVALID_VALUE, kIndexExceedsMaxVertexAttribute);
        return false;
    }

    return true;
}

bool ValidateTexImage3DOES(Context *context,
                           GLenum target,
                           GLint level,
                           GLenum internalformat,
                           GLsizei width,
                           GLsizei height,
                           GLsizei depth,
                           GLint border,
                           GLenum format,
                           GLenum type,
                           const void *pixels)
{
    UNIMPLEMENTED();  // FIXME
    return false;
}

bool ValidatePopGroupMarkerEXT(Context *context)
{
    if (!context->getExtensions().debugMarker)
    {
        // The debug marker calls should not set error state
        // However, it seems reasonable to set an error state if the extension is not enabled
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return true;
}

bool ValidateTexStorage1DEXT(Context *context,
                             GLenum target,
                             GLsizei levels,
                             GLenum internalformat,
                             GLsizei width)
{
    UNIMPLEMENTED();
    context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
    return false;
}

bool ValidateTexStorage3DEXT(Context *context,
                             TextureType target,
                             GLsizei levels,
                             GLenum internalformat,
                             GLsizei width,
                             GLsizei height,
                             GLsizei depth)
{
    if (!context->getExtensions().textureStorage)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    if (context->getClientMajorVersion() < 3)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    return ValidateES3TexStorage3DParameters(context, target, levels, internalformat, width, height,
                                             depth);
}

bool ValidateMaxShaderCompilerThreadsKHR(Context *context, GLuint count)
{
    if (!context->getExtensions().parallelShaderCompile)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }
    return true;
}

bool ValidateMultiDrawArraysANGLE(Context *context,
                                  PrimitiveMode mode,
                                  const GLint *firsts,
                                  const GLsizei *counts,
                                  GLsizei drawcount)
{
    if (!context->getExtensions().multiDraw)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }
    for (GLsizei drawID = 0; drawID < drawcount; ++drawID)
    {
        if (!ValidateDrawArrays(context, mode, firsts[drawID], counts[drawID]))
        {
            return false;
        }
    }
    return true;
}

bool ValidateMultiDrawElementsANGLE(Context *context,
                                    PrimitiveMode mode,
                                    const GLsizei *counts,
                                    DrawElementsType type,
                                    const GLvoid *const *indices,
                                    GLsizei drawcount)
{
    if (!context->getExtensions().multiDraw)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }
    for (GLsizei drawID = 0; drawID < drawcount; ++drawID)
    {
        if (!ValidateDrawElements(context, mode, counts[drawID], type, indices[drawID]))
        {
            return false;
        }
    }
    return true;
}

bool ValidateProvokingVertexANGLE(Context *context, ProvokingVertex modePacked)
{
    if (!context->getExtensions().provokingVertex)
    {
        context->validationError(GL_INVALID_OPERATION, kExtensionNotEnabled);
        return false;
    }

    switch (modePacked)
    {
        case ProvokingVertex::FirstVertexConvention:
        case ProvokingVertex::LastVertexConvention:
            break;
        default:
            context->validationError(GL_INVALID_ENUM, kInvalidProvokingVertex);
            return false;
    }

    return true;
}

void RecordBindTextureTypeError(Context *context, TextureType target)
{
    ASSERT(!context->getStateCache().isValidBindTextureType(target));

    switch (target)
    {
        case TextureType::Rectangle:
            ASSERT(!context->getExtensions().textureRectangle);
            context->validationError(GL_INVALID_ENUM, kTextureRectangleNotSupported);
            break;

        case TextureType::_3D:
        case TextureType::_2DArray:
            ASSERT(context->getClientMajorVersion() < 3);
            context->validationError(GL_INVALID_ENUM, kES3Required);
            break;

        case TextureType::_2DMultisample:
            ASSERT(context->getClientVersion() < Version(3, 1) &&
                   !context->getExtensions().textureMultisample);
            context->validationError(GL_INVALID_ENUM, kMultisampleTextureExtensionOrES31Required);
            break;

        case TextureType::_2DMultisampleArray:
            ASSERT(!context->getExtensions().textureStorageMultisample2DArray);
            context->validationError(GL_INVALID_ENUM, kMultisampleArrayExtensionRequired);
            break;

        case TextureType::External:
            ASSERT(!context->getExtensions().eglImageExternal &&
                   !context->getExtensions().eglStreamConsumerExternal);
            context->validationError(GL_INVALID_ENUM, kExternalTextureNotSupported);
            break;

        default:
            context->validationError(GL_INVALID_ENUM, kInvalidTextureTarget);
    }
}

}  // namespace gl
kc3-lang/angle/src/libANGLE/validationES2.cpp

Commit

kc3-lang/angle /src/libANGLE/validationES2.cpp
