validationES.cpp

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Author : James Darpinian
Date : 2018-01-04 18:02:24
Hash : e8a93c6e
Message : New transform feedback buffer binding rules Detects undefined behavior when a buffer is bound to a transform feedback binding point and a non transform feedback binding point at the same time. Also moves the transform feedback buffer generic binding point out of the transform feedback object and into the context's global state, to match driver behavior. This way binding a new transform feedback object does not affect GL_TRANSFORM_FEEDBACK_BUFFER_BINDING which is similar to how VAOs work with GL_ARRAY_BUFFER_BINDING. Bug: 696345 Change-Id: If3b9306cde7cd2197a8ce35e10c3af9ee58da0b8 Reviewed-on: https://chromium-review.googlesource.com/853130 Commit-Queue: James Darpinian <jdarpinian@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>
src/libANGLE/validationES.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.
//

// validationES.h: Validation functions for generic OpenGL ES entry point parameters

#include "libANGLE/validationES.h"

#include "libANGLE/Context.h"
#include "libANGLE/Display.h"
#include "libANGLE/ErrorStrings.h"
#include "libANGLE/Framebuffer.h"
#include "libANGLE/FramebufferAttachment.h"
#include "libANGLE/Image.h"
#include "libANGLE/Program.h"
#include "libANGLE/Query.h"
#include "libANGLE/Texture.h"
#include "libANGLE/TransformFeedback.h"
#include "libANGLE/VertexArray.h"
#include "libANGLE/formatutils.h"
#include "libANGLE/queryconversions.h"
#include "libANGLE/validationES2.h"
#include "libANGLE/validationES3.h"

#include "common/mathutil.h"
#include "common/utilities.h"

using namespace angle;

namespace gl
{
namespace
{
bool CompressedTextureFormatRequiresExactSize(GLenum internalFormat)
{
    // List of compressed format that require that the texture size is smaller than or a multiple of
    // the compressed block size.
    switch (internalFormat)
    {
        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_COMPRESSED_SRGB_S3TC_DXT1_EXT:
        case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
        case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
        case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
        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_RGBA8_LOSSY_DECODE_ETC2_EAC_ANGLE:
        case GL_COMPRESSED_SRGB8_ALPHA8_LOSSY_DECODE_ETC2_EAC_ANGLE:
            return true;

        default:
            return false;
    }
}
bool CompressedSubTextureFormatRequiresExactSize(GLenum internalFormat)
{
    // Compressed sub textures have additional formats that requires exact size.
    // ES 3.1, Section 8.7, Page 171
    return CompressedTextureFormatRequiresExactSize(internalFormat) ||
           IsETC2EACFormat(internalFormat);
}
bool ValidateDrawAttribs(ValidationContext *context,
                         GLint primcount,
                         GLint maxVertex,
                         GLint vertexCount)
{
    const gl::State &state     = context->getGLState();
    const gl::Program *program = state.getProgram();

    bool webglCompatibility = context->getExtensions().webglCompatibility;

    const VertexArray *vao     = state.getVertexArray();
    const auto &vertexAttribs  = vao->getVertexAttributes();
    const auto &vertexBindings = vao->getVertexBindings();
    for (size_t attributeIndex : vao->getEnabledAttributesMask())
    {
        const VertexAttribute &attrib = vertexAttribs[attributeIndex];

        // No need to range check for disabled attribs.
        if (!attrib.enabled)
        {
            continue;
        }

        // If we have no buffer, then we either get an error, or there are no more checks to be
        // done.
        const VertexBinding &binding  = vertexBindings[attrib.bindingIndex];
        gl::Buffer *buffer            = binding.getBuffer().get();
        if (!buffer)
        {
            if (webglCompatibility || !state.areClientArraysEnabled())
            {
                // [WebGL 1.0] Section 6.5 Enabled Vertex Attributes and Range Checking
                // If a vertex attribute is enabled as an array via enableVertexAttribArray but
                // no buffer is bound to that attribute via bindBuffer and vertexAttribPointer,
                // then calls to drawArrays or drawElements will generate an INVALID_OPERATION
                // error.
                ANGLE_VALIDATION_ERR(context, InvalidOperation(), VertexArrayNoBuffer);
                return false;
            }
            else if (attrib.pointer == nullptr)
            {
                // This is an application error that would normally result in a crash,
                // but we catch it and return an error
                ANGLE_VALIDATION_ERR(context, InvalidOperation(), VertexArrayNoBufferPointer);
                return false;
            }
            continue;
        }

        // This needs to come after the check for client arrays as even unused attributes cannot use
        // client-side arrays
        if (!program->isAttribLocationActive(attributeIndex))
        {
            continue;
        }

        // If we're drawing zero vertices, we have enough data.
        if (vertexCount <= 0 || primcount <= 0)
        {
            continue;
        }

        GLint maxVertexElement = 0;
        GLuint divisor         = binding.getDivisor();
        if (divisor == 0)
        {
            maxVertexElement = maxVertex;
        }
        else
        {
            maxVertexElement = (primcount - 1) / divisor;
        }

        // We do manual overflow checks here instead of using safe_math.h because it was
        // a bottleneck. Thanks to some properties of GL we know inequalities that can
        // help us make the overflow checks faster.

        // The max possible attribSize is 16 for a vector of 4 32 bit values.
        constexpr uint64_t kMaxAttribSize = 16;
        constexpr uint64_t kIntMax        = std::numeric_limits<int>::max();
        constexpr uint64_t kUint64Max     = std::numeric_limits<uint64_t>::max();

        // We know attribStride is given as a GLsizei which is typedefed to int.
        // We also know an upper bound for attribSize.
        static_assert(std::is_same<int, GLsizei>::value, "");
        uint64_t attribStride = ComputeVertexAttributeStride(attrib, binding);
        uint64_t attribSize   = ComputeVertexAttributeTypeSize(attrib);
        ASSERT(attribStride <= kIntMax && attribSize <= kMaxAttribSize);

        // Computing the max offset using uint64_t without attrib.offset is overflow
        // safe. Note: Last vertex element does not take the full stride!
        static_assert(kIntMax * kIntMax < kUint64Max - kMaxAttribSize, "");
        uint64_t attribDataSizeNoOffset = maxVertexElement * attribStride + attribSize;

        // An overflow can happen when adding the offset, check for it.
        uint64_t attribOffset = ComputeVertexAttributeOffset(attrib, binding);
        if (attribDataSizeNoOffset > kUint64Max - attribOffset)
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), IntegerOverflow);
            return false;
        }
        uint64_t attribDataSizeWithOffset = attribDataSizeNoOffset + attribOffset;

        // [OpenGL ES 3.0.2] section 2.9.4 page 40:
        // We can return INVALID_OPERATION if our vertex attribute does not have
        // enough backing data.
        if (attribDataSizeWithOffset > static_cast<uint64_t>(buffer->getSize()))
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), InsufficientVertexBufferSize);
            return false;
        }

        if (webglCompatibility && buffer->isBoundForTransformFeedbackAndOtherUse())
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(),
                                 VertexBufferBoundForTransformFeedback);
            return false;
        }
    }

    return true;
}

bool ValidReadPixelsTypeEnum(ValidationContext *context, GLenum type)
{
    switch (type)
    {
        // Types referenced in Table 3.4 of the ES 2.0.25 spec
        case GL_UNSIGNED_BYTE:
        case GL_UNSIGNED_SHORT_4_4_4_4:
        case GL_UNSIGNED_SHORT_5_5_5_1:
        case GL_UNSIGNED_SHORT_5_6_5:
            return context->getClientVersion() >= ES_2_0;

        // Types referenced in Table 3.2 of the ES 3.0.5 spec (Except depth stencil)
        case GL_BYTE:
        case GL_INT:
        case GL_SHORT:
        case GL_UNSIGNED_INT:
        case GL_UNSIGNED_INT_10F_11F_11F_REV:
        case GL_UNSIGNED_INT_24_8:
        case GL_UNSIGNED_INT_2_10_10_10_REV:
        case GL_UNSIGNED_INT_5_9_9_9_REV:
        case GL_UNSIGNED_SHORT:
        case GL_UNSIGNED_SHORT_1_5_5_5_REV_EXT:
        case GL_UNSIGNED_SHORT_4_4_4_4_REV_EXT:
            return context->getClientVersion() >= ES_3_0;

        case GL_FLOAT:
            return context->getClientVersion() >= ES_3_0 || context->getExtensions().textureFloat ||
                   context->getExtensions().colorBufferHalfFloat;

        case GL_HALF_FLOAT:
            return context->getClientVersion() >= ES_3_0 ||
                   context->getExtensions().textureHalfFloat;

        case GL_HALF_FLOAT_OES:
            return context->getExtensions().colorBufferHalfFloat;

        default:
            return false;
    }
}

bool ValidReadPixelsFormatEnum(ValidationContext *context, GLenum format)
{
    switch (format)
    {
        // Formats referenced in Table 3.4 of the ES 2.0.25 spec (Except luminance)
        case GL_RGBA:
        case GL_RGB:
        case GL_ALPHA:
            return context->getClientVersion() >= ES_2_0;

        // Formats referenced in Table 3.2 of the ES 3.0.5 spec
        case GL_RG:
        case GL_RED:
        case GL_RGBA_INTEGER:
        case GL_RGB_INTEGER:
        case GL_RG_INTEGER:
        case GL_RED_INTEGER:
            return context->getClientVersion() >= ES_3_0;

        case GL_SRGB_ALPHA_EXT:
        case GL_SRGB_EXT:
            return context->getExtensions().sRGB;

        case GL_BGRA_EXT:
            return context->getExtensions().readFormatBGRA;

        default:
            return false;
    }
}

bool ValidReadPixelsFormatType(ValidationContext *context,
                               GLenum framebufferComponentType,
                               GLenum format,
                               GLenum type)
{
    switch (framebufferComponentType)
    {
        case GL_UNSIGNED_NORMALIZED:
            // TODO(geofflang): Don't accept BGRA here.  Some chrome internals appear to try to use
            // ReadPixels with BGRA even if the extension is not present
            return (format == GL_RGBA && type == GL_UNSIGNED_BYTE) ||
                   (context->getExtensions().readFormatBGRA && format == GL_BGRA_EXT &&
                    type == GL_UNSIGNED_BYTE);

        case GL_SIGNED_NORMALIZED:
            return (format == GL_RGBA && type == GL_UNSIGNED_BYTE);

        case GL_INT:
            return (format == GL_RGBA_INTEGER && type == GL_INT);

        case GL_UNSIGNED_INT:
            return (format == GL_RGBA_INTEGER && type == GL_UNSIGNED_INT);

        case GL_FLOAT:
            return (format == GL_RGBA && type == GL_FLOAT);

        default:
            UNREACHABLE();
            return false;
    }
}

template <typename ParamType>
bool ValidateTextureWrapModeValue(Context *context, ParamType *params, bool restrictedWrapModes)
{
    switch (ConvertToGLenum(params[0]))
    {
        case GL_CLAMP_TO_EDGE:
            break;

        case GL_REPEAT:
        case GL_MIRRORED_REPEAT:
            if (restrictedWrapModes)
            {
                // OES_EGL_image_external and ANGLE_texture_rectangle specifies this error.
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidWrapModeTexture);
                return false;
            }
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidTextureWrap);
            return false;
    }

    return true;
}

template <typename ParamType>
bool ValidateTextureMinFilterValue(Context *context, ParamType *params, bool restrictedMinFilter)
{
    switch (ConvertToGLenum(params[0]))
    {
        case GL_NEAREST:
        case GL_LINEAR:
            break;

        case GL_NEAREST_MIPMAP_NEAREST:
        case GL_LINEAR_MIPMAP_NEAREST:
        case GL_NEAREST_MIPMAP_LINEAR:
        case GL_LINEAR_MIPMAP_LINEAR:
            if (restrictedMinFilter)
            {
                // OES_EGL_image_external specifies this error.
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidFilterTexture);
                return false;
            }
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidTextureFilterParam);
            return false;
    }

    return true;
}

template <typename ParamType>
bool ValidateTextureMagFilterValue(Context *context, ParamType *params)
{
    switch (ConvertToGLenum(params[0]))
    {
        case GL_NEAREST:
        case GL_LINEAR:
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidTextureFilterParam);
            return false;
    }

    return true;
}

template <typename ParamType>
bool ValidateTextureCompareModeValue(Context *context, ParamType *params)
{
    // Acceptable mode parameters from GLES 3.0.2 spec, table 3.17
    switch (ConvertToGLenum(params[0]))
    {
        case GL_NONE:
        case GL_COMPARE_REF_TO_TEXTURE:
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), UnknownParameter);
            return false;
    }

    return true;
}

template <typename ParamType>
bool ValidateTextureCompareFuncValue(Context *context, ParamType *params)
{
    // Acceptable function parameters from GLES 3.0.2 spec, table 3.17
    switch (ConvertToGLenum(params[0]))
    {
        case GL_LEQUAL:
        case GL_GEQUAL:
        case GL_LESS:
        case GL_GREATER:
        case GL_EQUAL:
        case GL_NOTEQUAL:
        case GL_ALWAYS:
        case GL_NEVER:
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), UnknownParameter);
            return false;
    }

    return true;
}

template <typename ParamType>
bool ValidateTextureSRGBDecodeValue(Context *context, ParamType *params)
{
    if (!context->getExtensions().textureSRGBDecode)
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), ExtensionNotEnabled);
        return false;
    }

    switch (ConvertToGLenum(params[0]))
    {
        case GL_DECODE_EXT:
        case GL_SKIP_DECODE_EXT:
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), UnknownParameter);
            return false;
    }

    return true;
}

bool ValidateTextureMaxAnisotropyExtensionEnabled(Context *context)
{
    if (!context->getExtensions().textureFilterAnisotropic)
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), ExtensionNotEnabled);
        return false;
    }

    return true;
}

bool ValidateTextureMaxAnisotropyValue(Context *context, GLfloat paramValue)
{
    if (!ValidateTextureMaxAnisotropyExtensionEnabled(context))
    {
        return false;
    }

    GLfloat largest = context->getExtensions().maxTextureAnisotropy;

    if (paramValue < 1 || paramValue > largest)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), OutsideOfBounds);
        return false;
    }

    return true;
}

bool ValidateFragmentShaderColorBufferTypeMatch(ValidationContext *context)
{
    const Program *program         = context->getGLState().getProgram();
    const Framebuffer *framebuffer = context->getGLState().getDrawFramebuffer();

    if (!ComponentTypeMask::Validate(program->getDrawBufferTypeMask().to_ulong(),
                                     framebuffer->getDrawBufferTypeMask().to_ulong(),
                                     program->getActiveOutputVariables().to_ulong(),
                                     framebuffer->getDrawBufferMask().to_ulong()))
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), DrawBufferTypeMismatch);
        return false;
    }

    return true;
}

bool ValidateVertexShaderAttributeTypeMatch(ValidationContext *context)
{
    const auto &glState       = context->getGLState();
    const Program *program = context->getGLState().getProgram();
    const VertexArray *vao = context->getGLState().getVertexArray();

    unsigned long stateCurrentValuesTypeBits = glState.getCurrentValuesTypeMask().to_ulong();
    unsigned long vaoAttribTypeBits          = vao->getAttributesTypeMask().to_ulong();
    unsigned long vaoAttribEnabledMask       = vao->getAttributesMask().to_ulong();

    vaoAttribEnabledMask |= vaoAttribEnabledMask << MAX_COMPONENT_TYPE_MASK_INDEX;
    vaoAttribTypeBits = (vaoAttribEnabledMask & vaoAttribTypeBits);
    vaoAttribTypeBits |= (~vaoAttribEnabledMask & stateCurrentValuesTypeBits);

    if (!ComponentTypeMask::Validate(program->getAttributesTypeMask().to_ulong(), vaoAttribTypeBits,
                                     program->getAttributesMask().to_ulong(), 0xFFFF))
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), VertexShaderTypeMismatch);
        return false;
    }
    return true;
}

}  // anonymous namespace

bool IsETC2EACFormat(const GLenum format)
{
    // ES 3.1, Table 8.19
    switch (format)
    {
        case GL_COMPRESSED_R11_EAC:
        case GL_COMPRESSED_SIGNED_R11_EAC:
        case GL_COMPRESSED_RG11_EAC:
        case GL_COMPRESSED_SIGNED_RG11_EAC:
        case GL_COMPRESSED_RGB8_ETC2:
        case GL_COMPRESSED_SRGB8_ETC2:
        case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2:
        case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2:
        case GL_COMPRESSED_RGBA8_ETC2_EAC:
        case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC:
            return true;

        default:
            return false;
    }
}

bool ValidTextureTarget(const ValidationContext *context, TextureType type)
{
    switch (type)
    {
        case TextureType::_2D:
        case TextureType::CubeMap:
            return true;

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

        case TextureType::_3D:
        case TextureType::_2DArray:
            return (context->getClientMajorVersion() >= 3);

        case TextureType::_2DMultisample:
            return (context->getClientVersion() >= Version(3, 1));

        default:
            return false;
    }
}

bool ValidTexture2DTarget(const ValidationContext *context, TextureType type)
{
    switch (type)
    {
        case TextureType::_2D:
        case TextureType::CubeMap:
            return true;

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

        default:
            return false;
    }
}

bool ValidTexture3DTarget(const ValidationContext *context, TextureType target)
{
    switch (target)
    {
        case TextureType::_3D:
        case TextureType::_2DArray:
            return (context->getClientMajorVersion() >= 3);

        default:
            return false;
    }
}

// Most texture GL calls are not compatible with external textures, so we have a separate validation
// function for use in the GL calls that do
bool ValidTextureExternalTarget(const ValidationContext *context, TextureType target)
{
    return (target == TextureType::External) &&
           (context->getExtensions().eglImageExternal ||
            context->getExtensions().eglStreamConsumerExternal);
}

// This function differs from ValidTextureTarget in that the target must be
// usable as the destination of a 2D operation-- so a cube face is valid, but
// GL_TEXTURE_CUBE_MAP is not.
// Note: duplicate of IsInternalTextureTarget
bool ValidTexture2DDestinationTarget(const ValidationContext *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 ValidateDrawElementsInstancedBase(ValidationContext *context,
                                       GLenum mode,
                                       GLsizei count,
                                       GLenum type,
                                       const GLvoid *indices,
                                       GLsizei primcount)
{
    if (primcount < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativePrimcount);
        return false;
    }

    if (!ValidateDrawElementsCommon(context, mode, count, type, indices, primcount))
    {
        return false;
    }

    return true;
}

bool ValidateDrawArraysInstancedBase(Context *context,
                                     GLenum mode,
                                     GLint first,
                                     GLsizei count,
                                     GLsizei primcount)
{
    if (primcount < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativePrimcount);
        return false;
    }

    if (!ValidateDrawArraysCommon(context, mode, first, count, primcount))
    {
        return false;
    }

    return true;
}

bool ValidateDrawInstancedANGLE(ValidationContext *context)
{
    // Verify there is at least one active attribute with a divisor of zero
    const State &state = context->getGLState();

    Program *program = state.getProgram();

    const auto &attribs  = state.getVertexArray()->getVertexAttributes();
    const auto &bindings = state.getVertexArray()->getVertexBindings();
    for (size_t attributeIndex = 0; attributeIndex < MAX_VERTEX_ATTRIBS; attributeIndex++)
    {
        const VertexAttribute &attrib = attribs[attributeIndex];
        const VertexBinding &binding  = bindings[attrib.bindingIndex];
        if (program->isAttribLocationActive(attributeIndex) && binding.getDivisor() == 0)
        {
            return true;
        }
    }

    ANGLE_VALIDATION_ERR(context, InvalidOperation(), NoZeroDivisor);
    return false;
}

bool ValidTexture3DDestinationTarget(const ValidationContext *context, TextureType target)
{
    switch (target)
    {
        case TextureType::_3D:
        case TextureType::_2DArray:
            return true;
        default:
            return false;
    }
}

bool ValidTexLevelDestinationTarget(const ValidationContext *context, TextureType type)
{
    switch (type)
    {
        case TextureType::_2D:
        case TextureType::_2DArray:
        case TextureType::_2DMultisample:
        case TextureType::CubeMap:
        case TextureType::_3D:
            return true;
        case TextureType::Rectangle:
            return context->getExtensions().textureRectangle;
        default:
            return false;
    }
}

bool ValidFramebufferTarget(const ValidationContext *context, GLenum target)
{
    static_assert(GL_DRAW_FRAMEBUFFER_ANGLE == GL_DRAW_FRAMEBUFFER &&
                      GL_READ_FRAMEBUFFER_ANGLE == GL_READ_FRAMEBUFFER,
                  "ANGLE framebuffer enums must equal the ES3 framebuffer enums.");

    switch (target)
    {
        case GL_FRAMEBUFFER:
            return true;

        case GL_READ_FRAMEBUFFER:
        case GL_DRAW_FRAMEBUFFER:
            return (context->getExtensions().framebufferBlit ||
                    context->getClientMajorVersion() >= 3);

        default:
            return false;
    }
}

bool ValidMipLevel(const ValidationContext *context, TextureType type, GLint level)
{
    const auto &caps    = context->getCaps();
    size_t maxDimension = 0;
    switch (type)
    {
        case TextureType::_2D:
        case TextureType::_2DArray:
        case TextureType::_2DMultisample:
            maxDimension = caps.max2DTextureSize;
            break;
        case TextureType::CubeMap:
            maxDimension = caps.maxCubeMapTextureSize;
            break;
        case TextureType::Rectangle:
            return level == 0;
        case TextureType::_3D:
            maxDimension = caps.max3DTextureSize;
            break;
        default:
            UNREACHABLE();
    }

    return level <= gl::log2(static_cast<int>(maxDimension)) && level >= 0;
}

bool ValidImageSizeParameters(ValidationContext *context,
                              TextureType target,
                              GLint level,
                              GLsizei width,
                              GLsizei height,
                              GLsizei depth,
                              bool isSubImage)
{
    if (width < 0 || height < 0 || depth < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeSize);
        return false;
    }
    // TexSubImage parameters can be NPOT without textureNPOT extension,
    // as long as the destination texture is POT.
    bool hasNPOTSupport =
        context->getExtensions().textureNPOT || context->getClientVersion() >= Version(3, 0);
    if (!isSubImage && !hasNPOTSupport &&
        (level != 0 && (!gl::isPow2(width) || !gl::isPow2(height) || !gl::isPow2(depth))))
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), TextureNotPow2);
        return false;
    }

    if (!ValidMipLevel(context, target, level))
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), InvalidMipLevel);
        return false;
    }

    return true;
}

bool ValidCompressedDimension(GLsizei size, GLuint blockSize, bool smallerThanBlockSizeAllowed)
{
    return (smallerThanBlockSizeAllowed && (size > 0) && (blockSize % size == 0)) ||
           (size % blockSize == 0);
}

bool ValidCompressedImageSize(const ValidationContext *context,
                              GLenum internalFormat,
                              GLint level,
                              GLsizei width,
                              GLsizei height)
{
    const gl::InternalFormat &formatInfo = gl::GetSizedInternalFormatInfo(internalFormat);
    if (!formatInfo.compressed)
    {
        return false;
    }

    if (width < 0 || height < 0)
    {
        return false;
    }

    if (CompressedTextureFormatRequiresExactSize(internalFormat))
    {
        // The ANGLE extensions allow specifying compressed textures with sizes smaller than the
        // block size for level 0 but WebGL disallows this.
        bool smallerThanBlockSizeAllowed =
            level > 0 || !context->getExtensions().webglCompatibility;

        if (!ValidCompressedDimension(width, formatInfo.compressedBlockWidth,
                                      smallerThanBlockSizeAllowed) ||
            !ValidCompressedDimension(height, formatInfo.compressedBlockHeight,
                                      smallerThanBlockSizeAllowed))
        {
            return false;
        }
    }

    return true;
}

bool ValidCompressedSubImageSize(const ValidationContext *context,
                                 GLenum internalFormat,
                                 GLint xoffset,
                                 GLint yoffset,
                                 GLsizei width,
                                 GLsizei height,
                                 size_t textureWidth,
                                 size_t textureHeight)
{
    const gl::InternalFormat &formatInfo = gl::GetSizedInternalFormatInfo(internalFormat);
    if (!formatInfo.compressed)
    {
        return false;
    }

    if (xoffset < 0 || yoffset < 0 || width < 0 || height < 0)
    {
        return false;
    }

    if (CompressedSubTextureFormatRequiresExactSize(internalFormat))
    {
        if (xoffset % formatInfo.compressedBlockWidth != 0 ||
            yoffset % formatInfo.compressedBlockHeight != 0)
        {
            return false;
        }

        // Allowed to either have data that is a multiple of block size or is smaller than the block
        // size but fills the entire mip
        bool fillsEntireMip = xoffset == 0 && yoffset == 0 &&
                              static_cast<size_t>(width) == textureWidth &&
                              static_cast<size_t>(height) == textureHeight;
        bool sizeMultipleOfBlockSize = (width % formatInfo.compressedBlockWidth) == 0 &&
                                       (height % formatInfo.compressedBlockHeight) == 0;
        if (!sizeMultipleOfBlockSize && !fillsEntireMip)
        {
            return false;
        }
    }

    return true;
}

bool ValidImageDataSize(ValidationContext *context,
                        TextureType texType,
                        GLsizei width,
                        GLsizei height,
                        GLsizei depth,
                        GLenum format,
                        GLenum type,
                        const void *pixels,
                        GLsizei imageSize)
{
    gl::Buffer *pixelUnpackBuffer =
        context->getGLState().getTargetBuffer(BufferBinding::PixelUnpack);
    if (pixelUnpackBuffer == nullptr && imageSize < 0)
    {
        // Checks are not required
        return true;
    }

    // ...the data would be unpacked from the buffer object such that the memory reads required
    // would exceed the data store size.
    const gl::InternalFormat &formatInfo = gl::GetInternalFormatInfo(format, type);
    ASSERT(formatInfo.internalFormat != GL_NONE);
    const gl::Extents size(width, height, depth);
    const auto &unpack = context->getGLState().getUnpackState();

    bool targetIs3D   = texType == TextureType::_3D || texType == TextureType::_2DArray;
    auto endByteOrErr = formatInfo.computePackUnpackEndByte(type, size, unpack, targetIs3D);
    if (endByteOrErr.isError())
    {
        context->handleError(endByteOrErr.getError());
        return false;
    }

    GLuint endByte = endByteOrErr.getResult();

    if (pixelUnpackBuffer)
    {
        CheckedNumeric<size_t> checkedEndByte(endByteOrErr.getResult());
        CheckedNumeric<size_t> checkedOffset(reinterpret_cast<size_t>(pixels));
        checkedEndByte += checkedOffset;

        if (!checkedEndByte.IsValid() ||
            (checkedEndByte.ValueOrDie() > static_cast<size_t>(pixelUnpackBuffer->getSize())))
        {
            // Overflow past the end of the buffer
            context->handleError(InvalidOperation());
            return false;
        }
        if (context->getExtensions().webglCompatibility &&
            pixelUnpackBuffer->isBoundForTransformFeedbackAndOtherUse())
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(),
                                 PixelUnpackBufferBoundForTransformFeedback);
            return false;
        }
    }
    else
    {
        ASSERT(imageSize >= 0);
        if (pixels == nullptr && imageSize != 0)
        {
            context->handleError(InvalidOperation()
                                 << "imageSize must be 0 if no texture data is provided.");
            return false;
        }

        if (pixels != nullptr && endByte > static_cast<GLuint>(imageSize))
        {
            context->handleError(InvalidOperation() << "imageSize must be at least " << endByte);
            return false;
        }
    }

    return true;
}

bool ValidQueryType(const Context *context, GLenum queryType)
{
    static_assert(GL_ANY_SAMPLES_PASSED == GL_ANY_SAMPLES_PASSED_EXT,
                  "GL extension enums not equal.");
    static_assert(GL_ANY_SAMPLES_PASSED_CONSERVATIVE == GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT,
                  "GL extension enums not equal.");

    switch (queryType)
    {
        case GL_ANY_SAMPLES_PASSED:
        case GL_ANY_SAMPLES_PASSED_CONSERVATIVE:
            return context->getClientMajorVersion() >= 3 ||
                   context->getExtensions().occlusionQueryBoolean;
        case GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
            return (context->getClientMajorVersion() >= 3);
        case GL_TIME_ELAPSED_EXT:
            return context->getExtensions().disjointTimerQuery;
        case GL_COMMANDS_COMPLETED_CHROMIUM:
            return context->getExtensions().syncQuery;
        default:
            return false;
    }
}

bool ValidateWebGLVertexAttribPointer(ValidationContext *context,
                                      GLenum type,
                                      GLboolean normalized,
                                      GLsizei stride,
                                      const void *ptr,
                                      bool pureInteger)
{
    ASSERT(context->getExtensions().webglCompatibility);
    // WebGL 1.0 [Section 6.11] Vertex Attribute Data Stride
    // The WebGL API supports vertex attribute data strides up to 255 bytes. A call to
    // vertexAttribPointer will generate an INVALID_VALUE error if the value for the stride
    // parameter exceeds 255.
    constexpr GLsizei kMaxWebGLStride = 255;
    if (stride > kMaxWebGLStride)
    {
        context->handleError(InvalidValue()
                             << "Stride is over the maximum stride allowed by WebGL.");
        return false;
    }

    // WebGL 1.0 [Section 6.4] Buffer Offset and Stride Requirements
    // The offset arguments to drawElements and vertexAttribPointer, and the stride argument to
    // vertexAttribPointer, must be a multiple of the size of the data type passed to the call,
    // or an INVALID_OPERATION error is generated.
    VertexFormatType internalType = GetVertexFormatType(type, normalized, 1, pureInteger);
    size_t typeSize               = GetVertexFormatTypeSize(internalType);

    ASSERT(isPow2(typeSize) && typeSize > 0);
    size_t sizeMask = (typeSize - 1);
    if ((reinterpret_cast<intptr_t>(ptr) & sizeMask) != 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), OffsetMustBeMultipleOfType);
        return false;
    }

    if ((stride & sizeMask) != 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), StrideMustBeMultipleOfType);
        return false;
    }

    return true;
}

Program *GetValidProgram(ValidationContext *context, GLuint id)
{
    // ES3 spec (section 2.11.1) -- "Commands that accept shader or program object names will
    // generate the error INVALID_VALUE if the provided name is not the name of either a shader
    // or program object and INVALID_OPERATION if the provided name identifies an object
    // that is not the expected type."

    Program *validProgram = context->getProgram(id);

    if (!validProgram)
    {
        if (context->getShader(id))
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), ExpectedProgramName);
        }
        else
        {
            ANGLE_VALIDATION_ERR(context, InvalidValue(), InvalidProgramName);
        }
    }

    return validProgram;
}

Shader *GetValidShader(ValidationContext *context, GLuint id)
{
    // See ValidProgram for spec details.

    Shader *validShader = context->getShader(id);

    if (!validShader)
    {
        if (context->getProgram(id))
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), ExpectedShaderName);
        }
        else
        {
            ANGLE_VALIDATION_ERR(context, InvalidValue(), InvalidShaderName);
        }
    }

    return validShader;
}

bool ValidateAttachmentTarget(gl::Context *context, GLenum attachment)
{
    if (attachment >= GL_COLOR_ATTACHMENT1_EXT && attachment <= GL_COLOR_ATTACHMENT15_EXT)
    {
        if (context->getClientMajorVersion() < 3 && !context->getExtensions().drawBuffers)
        {
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidAttachment);
            return false;
        }

        // Color attachment 0 is validated below because it is always valid
        const unsigned int colorAttachment = (attachment - GL_COLOR_ATTACHMENT0_EXT);
        if (colorAttachment >= context->getCaps().maxColorAttachments)
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), InvalidAttachment);
            return false;
        }
    }
    else
    {
        switch (attachment)
        {
            case GL_COLOR_ATTACHMENT0:
            case GL_DEPTH_ATTACHMENT:
            case GL_STENCIL_ATTACHMENT:
                break;

            case GL_DEPTH_STENCIL_ATTACHMENT:
                if (!context->getExtensions().webglCompatibility &&
                    context->getClientMajorVersion() < 3)
                {
                    ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidAttachment);
                    return false;
                }
                break;

            default:
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidAttachment);
                return false;
        }
    }

    return true;
}

bool ValidateRenderbufferStorageParametersBase(ValidationContext *context,
                                               GLenum target,
                                               GLsizei samples,
                                               GLenum internalformat,
                                               GLsizei width,
                                               GLsizei height)
{
    switch (target)
    {
        case GL_RENDERBUFFER:
            break;
        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidRenderbufferTarget);
            return false;
    }

    if (width < 0 || height < 0 || samples < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), InvalidRenderbufferWidthHeight);
        return false;
    }

    // Hack for the special WebGL 1 "DEPTH_STENCIL" internal format.
    GLenum convertedInternalFormat = context->getConvertedRenderbufferFormat(internalformat);

    const TextureCaps &formatCaps = context->getTextureCaps().get(convertedInternalFormat);
    if (!formatCaps.renderable)
    {
        context->handleError(InvalidEnum());
        return false;
    }

    // ANGLE_framebuffer_multisample does not explicitly state that the internal format must be
    // sized but it does state that the format must be in the ES2.0 spec table 4.5 which contains
    // only sized internal formats.
    const gl::InternalFormat &formatInfo = gl::GetSizedInternalFormatInfo(convertedInternalFormat);
    if (formatInfo.internalFormat == GL_NONE)
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidRenderbufferInternalFormat);
        return false;
    }

    if (static_cast<GLuint>(std::max(width, height)) > context->getCaps().maxRenderbufferSize)
    {
        context->handleError(InvalidValue());
        return false;
    }

    GLuint handle = context->getGLState().getRenderbufferId();
    if (handle == 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), InvalidRenderbufferTarget);
        return false;
    }

    return true;
}

bool ValidateFramebufferRenderbufferParameters(gl::Context *context,
                                               GLenum target,
                                               GLenum attachment,
                                               GLenum renderbuffertarget,
                                               GLuint renderbuffer)
{
    if (!ValidFramebufferTarget(context, target))
    {
        context->handleError(InvalidEnum());
        return false;
    }

    gl::Framebuffer *framebuffer = context->getGLState().getTargetFramebuffer(target);

    ASSERT(framebuffer);
    if (framebuffer->id() == 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), DefaultFramebufferTarget);
        return false;
    }

    if (!ValidateAttachmentTarget(context, attachment))
    {
        return false;
    }

    // [OpenGL ES 2.0.25] Section 4.4.3 page 112
    // [OpenGL ES 3.0.2] Section 4.4.2 page 201
    // 'renderbuffer' must be either zero or the name of an existing renderbuffer object of
    // type 'renderbuffertarget', otherwise an INVALID_OPERATION error is generated.
    if (renderbuffer != 0)
    {
        if (!context->getRenderbuffer(renderbuffer))
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), InvalidRenderbufferTarget);
            return false;
        }
    }

    return true;
}

bool ValidateBlitFramebufferParameters(Context *context,
                                       GLint srcX0,
                                       GLint srcY0,
                                       GLint srcX1,
                                       GLint srcY1,
                                       GLint dstX0,
                                       GLint dstY0,
                                       GLint dstX1,
                                       GLint dstY1,
                                       GLbitfield mask,
                                       GLenum filter)
{
    switch (filter)
    {
        case GL_NEAREST:
            break;
        case GL_LINEAR:
            break;
        default:
            context->handleError(InvalidEnum());
            return false;
    }

    if ((mask & ~(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)) != 0)
    {
        context->handleError(InvalidValue());
        return false;
    }

    // ES3.0 spec, section 4.3.2 states that linear filtering is only available for the
    // color buffer, leaving only nearest being unfiltered from above
    if ((mask & ~GL_COLOR_BUFFER_BIT) != 0 && filter != GL_NEAREST)
    {
        context->handleError(InvalidOperation());
        return false;
    }

    const auto &glState              = context->getGLState();
    gl::Framebuffer *readFramebuffer = glState.getReadFramebuffer();
    gl::Framebuffer *drawFramebuffer = glState.getDrawFramebuffer();

    if (!readFramebuffer || !drawFramebuffer)
    {
        context->handleError(InvalidFramebufferOperation());
        return false;
    }

    if (readFramebuffer->checkStatus(context) != GL_FRAMEBUFFER_COMPLETE)
    {
        context->handleError(InvalidFramebufferOperation());
        return false;
    }

    if (drawFramebuffer->checkStatus(context) != GL_FRAMEBUFFER_COMPLETE)
    {
        context->handleError(InvalidFramebufferOperation());
        return false;
    }

    if (readFramebuffer->id() == drawFramebuffer->id())
    {
        context->handleError(InvalidOperation());
        return false;
    }

    if (drawFramebuffer->getSamples(context) != 0)
    {
        context->handleError(InvalidOperation());
        return false;
    }

    bool sameBounds = srcX0 == dstX0 && srcY0 == dstY0 && srcX1 == dstX1 && srcY1 == dstY1;

    if (mask & GL_COLOR_BUFFER_BIT)
    {
        const gl::FramebufferAttachment *readColorBuffer = readFramebuffer->getReadColorbuffer();
        const Extensions &extensions                     = context->getExtensions();

        if (readColorBuffer)
        {
            const Format &readFormat = readColorBuffer->getFormat();

            for (size_t drawbufferIdx = 0;
                 drawbufferIdx < drawFramebuffer->getDrawbufferStateCount(); ++drawbufferIdx)
            {
                const FramebufferAttachment *attachment =
                    drawFramebuffer->getDrawBuffer(drawbufferIdx);
                if (attachment)
                {
                    const Format &drawFormat = attachment->getFormat();

                    // The GL ES 3.0.2 spec (pg 193) states that:
                    // 1) If the read buffer is fixed point format, the draw buffer must be as well
                    // 2) If the read buffer is an unsigned integer format, the draw buffer must be
                    // as well
                    // 3) If the read buffer is a signed integer format, the draw buffer must be as
                    // well
                    // Changes with EXT_color_buffer_float:
                    // Case 1) is changed to fixed point OR floating point
                    GLenum readComponentType = readFormat.info->componentType;
                    GLenum drawComponentType = drawFormat.info->componentType;
                    bool readFixedPoint      = (readComponentType == GL_UNSIGNED_NORMALIZED ||
                                           readComponentType == GL_SIGNED_NORMALIZED);
                    bool drawFixedPoint = (drawComponentType == GL_UNSIGNED_NORMALIZED ||
                                           drawComponentType == GL_SIGNED_NORMALIZED);

                    if (extensions.colorBufferFloat)
                    {
                        bool readFixedOrFloat = (readFixedPoint || readComponentType == GL_FLOAT);
                        bool drawFixedOrFloat = (drawFixedPoint || drawComponentType == GL_FLOAT);

                        if (readFixedOrFloat != drawFixedOrFloat)
                        {
                            context->handleError(InvalidOperation()
                                                 << "If the read buffer contains fixed-point or "
                                                    "floating-point values, the draw buffer must "
                                                    "as well.");
                            return false;
                        }
                    }
                    else if (readFixedPoint != drawFixedPoint)
                    {
                        context->handleError(InvalidOperation()
                                             << "If the read buffer contains fixed-point values, "
                                                "the draw buffer must as well.");
                        return false;
                    }

                    if (readComponentType == GL_UNSIGNED_INT &&
                        drawComponentType != GL_UNSIGNED_INT)
                    {
                        context->handleError(InvalidOperation());
                        return false;
                    }

                    if (readComponentType == GL_INT && drawComponentType != GL_INT)
                    {
                        context->handleError(InvalidOperation());
                        return false;
                    }

                    if (readColorBuffer->getSamples() > 0 &&
                        (!Format::EquivalentForBlit(readFormat, drawFormat) || !sameBounds))
                    {
                        context->handleError(InvalidOperation());
                        return false;
                    }

                    if (context->getExtensions().webglCompatibility &&
                        *readColorBuffer == *attachment)
                    {
                        context->handleError(
                            InvalidOperation()
                            << "Read and write color attachments cannot be the same image.");
                        return false;
                    }
                }
            }

            if ((readFormat.info->componentType == GL_INT ||
                 readFormat.info->componentType == GL_UNSIGNED_INT) &&
                filter == GL_LINEAR)
            {
                context->handleError(InvalidOperation());
                return false;
            }
        }
        // WebGL 2.0 BlitFramebuffer when blitting from a missing attachment
        // In OpenGL ES it is undefined what happens when an operation tries to blit from a missing
        // attachment and WebGL defines it to be an error. We do the check unconditionally as the
        // situation is an application error that would lead to a crash in ANGLE.
        else if (drawFramebuffer->hasEnabledDrawBuffer())
        {
            context->handleError(
                InvalidOperation()
                << "Attempt to read from a missing color attachment of a complete framebuffer.");
            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 gl::FramebufferAttachment *readBuffer =
                readFramebuffer->getAttachment(context, attachments[i]);
            const gl::FramebufferAttachment *drawBuffer =
                drawFramebuffer->getAttachment(context, attachments[i]);

            if (readBuffer && drawBuffer)
            {
                if (!Format::EquivalentForBlit(readBuffer->getFormat(), drawBuffer->getFormat()))
                {
                    context->handleError(InvalidOperation());
                    return false;
                }

                if (readBuffer->getSamples() > 0 && !sameBounds)
                {
                    context->handleError(InvalidOperation());
                    return false;
                }

                if (context->getExtensions().webglCompatibility && *readBuffer == *drawBuffer)
                {
                    context->handleError(
                        InvalidOperation()
                        << "Read and write depth stencil attachments cannot be the same image.");
                    return false;
                }
            }
            // WebGL 2.0 BlitFramebuffer when blitting from a missing attachment
            else if (drawBuffer)
            {
                context->handleError(InvalidOperation() << "Attempt to read from a missing "
                                                           "depth/stencil attachment of a "
                                                           "complete framebuffer.");
                return false;
            }
        }
    }

    // ANGLE_multiview, Revision 1:
    // Calling BlitFramebuffer will result in an INVALID_FRAMEBUFFER_OPERATION error if the
    // multi-view layout of the current draw framebuffer or read framebuffer is not NONE.
    if (readFramebuffer->getMultiviewLayout() != GL_NONE)
    {
        context->handleError(InvalidFramebufferOperation()
                             << "Attempt to read from a multi-view framebuffer.");
        return false;
    }
    if (drawFramebuffer->getMultiviewLayout() != GL_NONE)
    {
        context->handleError(InvalidFramebufferOperation()
                             << "Attempt to write to a multi-view framebuffer.");
        return false;
    }

    return true;
}

bool ValidateReadPixelsRobustANGLE(Context *context,
                                   GLint x,
                                   GLint y,
                                   GLsizei width,
                                   GLsizei height,
                                   GLenum format,
                                   GLenum type,
                                   GLsizei bufSize,
                                   GLsizei *length,
                                   GLsizei *columns,
                                   GLsizei *rows,
                                   void *pixels)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateReadPixelsBase(context, x, y, width, height, format, type, bufSize, length,
                                columns, rows, pixels))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateReadnPixelsEXT(Context *context,
                            GLint x,
                            GLint y,
                            GLsizei width,
                            GLsizei height,
                            GLenum format,
                            GLenum type,
                            GLsizei bufSize,
                            void *pixels)
{
    if (bufSize < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeBufferSize);
        return false;
    }

    return ValidateReadPixelsBase(context, x, y, width, height, format, type, bufSize, nullptr,
                                  nullptr, nullptr, pixels);
}

bool ValidateReadnPixelsRobustANGLE(Context *context,
                                    GLint x,
                                    GLint y,
                                    GLsizei width,
                                    GLsizei height,
                                    GLenum format,
                                    GLenum type,
                                    GLsizei bufSize,
                                    GLsizei *length,
                                    GLsizei *columns,
                                    GLsizei *rows,
                                    void *data)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateReadPixelsBase(context, x, y, width, height, format, type, bufSize, length,
                                columns, rows, data))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGenQueriesEXT(gl::Context *context, GLsizei n, GLuint *ids)
{
    if (!context->getExtensions().occlusionQueryBoolean &&
        !context->getExtensions().disjointTimerQuery)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), QueryExtensionNotEnabled);
        return false;
    }

    return ValidateGenOrDelete(context, n);
}

bool ValidateDeleteQueriesEXT(gl::Context *context, GLsizei n, const GLuint *ids)
{
    if (!context->getExtensions().occlusionQueryBoolean &&
        !context->getExtensions().disjointTimerQuery)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), QueryExtensionNotEnabled);
        return false;
    }

    return ValidateGenOrDelete(context, n);
}

bool ValidateIsQueryEXT(gl::Context *context, GLuint id)
{
    if (!context->getExtensions().occlusionQueryBoolean &&
        !context->getExtensions().disjointTimerQuery)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), QueryExtensionNotEnabled);
        return false;
    }

    return true;
}

bool ValidateBeginQueryBase(gl::Context *context, GLenum target, GLuint id)
{
    if (!ValidQueryType(context, target))
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidQueryType);
        return false;
    }

    if (id == 0)
    {
        context->handleError(InvalidOperation() << "Query id is 0");
        return false;
    }

    // From EXT_occlusion_query_boolean: If BeginQueryEXT is called with an <id>
    // of zero, if the active query object name for <target> is non-zero (for the
    // targets ANY_SAMPLES_PASSED_EXT and ANY_SAMPLES_PASSED_CONSERVATIVE_EXT, if
    // the active query for either target is non-zero), if <id> is the name of an
    // existing query object whose type does not match <target>, or if <id> is the
    // active query object name for any query type, the error INVALID_OPERATION is
    // generated.

    // Ensure no other queries are active
    // NOTE: If other queries than occlusion are supported, we will need to check
    // separately that:
    //    a) The query ID passed is not the current active query for any target/type
    //    b) There are no active queries for the requested target (and in the case
    //       of GL_ANY_SAMPLES_PASSED_EXT and GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT,
    //       no query may be active for either if glBeginQuery targets either.

    if (context->getGLState().isQueryActive(target))
    {
        context->handleError(InvalidOperation() << "Other query is active");
        return false;
    }

    Query *queryObject = context->getQuery(id, true, target);

    // check that name was obtained with glGenQueries
    if (!queryObject)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), InvalidQueryId);
        return false;
    }

    // check for type mismatch
    if (queryObject->getType() != target)
    {
        context->handleError(InvalidOperation() << "Query type does not match target");
        return false;
    }

    return true;
}

bool ValidateBeginQueryEXT(gl::Context *context, GLenum target, GLuint id)
{
    if (!context->getExtensions().occlusionQueryBoolean &&
        !context->getExtensions().disjointTimerQuery && !context->getExtensions().syncQuery)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), QueryExtensionNotEnabled);
        return false;
    }

    return ValidateBeginQueryBase(context, target, id);
}

bool ValidateEndQueryBase(gl::Context *context, GLenum target)
{
    if (!ValidQueryType(context, target))
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidQueryType);
        return false;
    }

    const Query *queryObject = context->getGLState().getActiveQuery(target);

    if (queryObject == nullptr)
    {
        context->handleError(InvalidOperation() << "Query target not active");
        return false;
    }

    return true;
}

bool ValidateEndQueryEXT(gl::Context *context, GLenum target)
{
    if (!context->getExtensions().occlusionQueryBoolean &&
        !context->getExtensions().disjointTimerQuery && !context->getExtensions().syncQuery)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), QueryExtensionNotEnabled);
        return false;
    }

    return ValidateEndQueryBase(context, target);
}

bool ValidateQueryCounterEXT(Context *context, GLuint id, GLenum target)
{
    if (!context->getExtensions().disjointTimerQuery)
    {
        context->handleError(InvalidOperation() << "Disjoint timer query not enabled");
        return false;
    }

    if (target != GL_TIMESTAMP_EXT)
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidQueryTarget);
        return false;
    }

    Query *queryObject = context->getQuery(id, true, target);
    if (queryObject == nullptr)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), InvalidQueryId);
        return false;
    }

    if (context->getGLState().isQueryActive(queryObject))
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), QueryActive);
        return false;
    }

    return true;
}

bool ValidateGetQueryivBase(Context *context, GLenum target, GLenum pname, GLsizei *numParams)
{
    if (numParams)
    {
        *numParams = 0;
    }

    if (!ValidQueryType(context, target) && target != GL_TIMESTAMP_EXT)
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidQueryType);
        return false;
    }

    switch (pname)
    {
        case GL_CURRENT_QUERY_EXT:
            if (target == GL_TIMESTAMP_EXT)
            {
                context->handleError(InvalidEnum() << "Cannot use current query for timestamp");
                return false;
            }
            break;
        case GL_QUERY_COUNTER_BITS_EXT:
            if (!context->getExtensions().disjointTimerQuery ||
                (target != GL_TIMESTAMP_EXT && target != GL_TIME_ELAPSED_EXT))
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidPname);
                return false;
            }
            break;
        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidPname);
            return false;
    }

    if (numParams)
    {
        // All queries return only one value
        *numParams = 1;
    }

    return true;
}

bool ValidateGetQueryivEXT(Context *context, GLenum target, GLenum pname, GLint *params)
{
    if (!context->getExtensions().occlusionQueryBoolean &&
        !context->getExtensions().disjointTimerQuery && !context->getExtensions().syncQuery)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ExtensionNotEnabled);
        return false;
    }

    return ValidateGetQueryivBase(context, target, pname, nullptr);
}

bool ValidateGetQueryivRobustANGLE(Context *context,
                                   GLenum target,
                                   GLenum pname,
                                   GLsizei bufSize,
                                   GLsizei *length,
                                   GLint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetQueryivBase(context, target, pname, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetQueryObjectValueBase(Context *context, GLuint id, GLenum pname, GLsizei *numParams)
{
    if (numParams)
    {
        *numParams = 0;
    }

    Query *queryObject = context->getQuery(id, false, GL_NONE);

    if (!queryObject)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), InvalidQueryId);
        return false;
    }

    if (context->getGLState().isQueryActive(queryObject))
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), QueryActive);
        return false;
    }

    switch (pname)
    {
        case GL_QUERY_RESULT_EXT:
        case GL_QUERY_RESULT_AVAILABLE_EXT:
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
            return false;
    }

    if (numParams)
    {
        *numParams = 1;
    }

    return true;
}

bool ValidateGetQueryObjectivEXT(Context *context, GLuint id, GLenum pname, GLint *params)
{
    if (!context->getExtensions().disjointTimerQuery)
    {
        context->handleError(InvalidOperation() << "Timer query extension not enabled");
        return false;
    }
    return ValidateGetQueryObjectValueBase(context, id, pname, nullptr);
}

bool ValidateGetQueryObjectivRobustANGLE(Context *context,
                                         GLuint id,
                                         GLenum pname,
                                         GLsizei bufSize,
                                         GLsizei *length,
                                         GLint *params)
{
    if (!context->getExtensions().disjointTimerQuery)
    {
        context->handleError(InvalidOperation() << "Timer query extension not enabled");
        return false;
    }

    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetQueryObjectValueBase(context, id, pname, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetQueryObjectuivEXT(Context *context, GLuint id, GLenum pname, GLuint *params)
{
    if (!context->getExtensions().disjointTimerQuery &&
        !context->getExtensions().occlusionQueryBoolean && !context->getExtensions().syncQuery)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ExtensionNotEnabled);
        return false;
    }
    return ValidateGetQueryObjectValueBase(context, id, pname, nullptr);
}

bool ValidateGetQueryObjectuivRobustANGLE(Context *context,
                                          GLuint id,
                                          GLenum pname,
                                          GLsizei bufSize,
                                          GLsizei *length,
                                          GLuint *params)
{
    if (!context->getExtensions().disjointTimerQuery &&
        !context->getExtensions().occlusionQueryBoolean && !context->getExtensions().syncQuery)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ExtensionNotEnabled);
        return false;
    }

    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetQueryObjectValueBase(context, id, pname, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetQueryObjecti64vEXT(Context *context, GLuint id, GLenum pname, GLint64 *params)
{
    if (!context->getExtensions().disjointTimerQuery)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ExtensionNotEnabled);
        return false;
    }
    return ValidateGetQueryObjectValueBase(context, id, pname, nullptr);
}

bool ValidateGetQueryObjecti64vRobustANGLE(Context *context,
                                           GLuint id,
                                           GLenum pname,
                                           GLsizei bufSize,
                                           GLsizei *length,
                                           GLint64 *params)
{
    if (!context->getExtensions().disjointTimerQuery)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ExtensionNotEnabled);
        return false;
    }

    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetQueryObjectValueBase(context, id, pname, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetQueryObjectui64vEXT(Context *context, GLuint id, GLenum pname, GLuint64 *params)
{
    if (!context->getExtensions().disjointTimerQuery)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ExtensionNotEnabled);
        return false;
    }
    return ValidateGetQueryObjectValueBase(context, id, pname, nullptr);
}

bool ValidateGetQueryObjectui64vRobustANGLE(Context *context,
                                            GLuint id,
                                            GLenum pname,
                                            GLsizei bufSize,
                                            GLsizei *length,
                                            GLuint64 *params)
{
    if (!context->getExtensions().disjointTimerQuery)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ExtensionNotEnabled);
        return false;
    }

    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetQueryObjectValueBase(context, id, pname, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateUniformCommonBase(ValidationContext *context,
                               gl::Program *program,
                               GLint location,
                               GLsizei count,
                               const LinkedUniform **uniformOut)
{
    // TODO(Jiajia): Add image uniform check in future.
    if (count < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeCount);
        return false;
    }

    if (!program)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), InvalidProgramName);
        return false;
    }

    if (!program->isLinked())
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ProgramNotLinked);
        return false;
    }

    if (location == -1)
    {
        // Silently ignore the uniform command
        return false;
    }

    const auto &uniformLocations = program->getUniformLocations();
    size_t castedLocation        = static_cast<size_t>(location);
    if (castedLocation >= uniformLocations.size())
    {
        context->handleError(InvalidOperation() << "Invalid uniform location");
        return false;
    }

    const auto &uniformLocation = uniformLocations[castedLocation];
    if (uniformLocation.ignored)
    {
        // Silently ignore the uniform command
        return false;
    }

    if (!uniformLocation.used())
    {
        context->handleError(InvalidOperation());
        return false;
    }

    const auto &uniform = program->getUniformByIndex(uniformLocation.index);

    // attempting to write an array to a non-array uniform is an INVALID_OPERATION
    if (!uniform.isArray() && count > 1)
    {
        context->handleError(InvalidOperation());
        return false;
    }

    *uniformOut = &uniform;
    return true;
}

bool ValidateUniform1ivValue(ValidationContext *context,
                             GLenum uniformType,
                             GLsizei count,
                             const GLint *value)
{
    // Value type is GL_INT, because we only get here from glUniform1i{v}.
    // It is compatible with INT or BOOL.
    // Do these cheap tests first, for a little extra speed.
    if (GL_INT == uniformType || GL_BOOL == uniformType)
    {
        return true;
    }

    if (IsSamplerType(uniformType))
    {
        // Check that the values are in range.
        const GLint max = context->getCaps().maxCombinedTextureImageUnits;
        for (GLsizei i = 0; i < count; ++i)
        {
            if (value[i] < 0 || value[i] >= max)
            {
                context->handleError(InvalidValue() << "sampler uniform value out of range");
                return false;
            }
        }
        return true;
    }

    context->handleError(InvalidOperation() << "wrong type of value for uniform");
    return false;
}

bool ValidateUniformValue(ValidationContext *context, GLenum valueType, GLenum uniformType)
{
    // Check that the value type is compatible with uniform type.
    // Do the cheaper test first, for a little extra speed.
    if (valueType == uniformType || VariableBoolVectorType(valueType) == uniformType)
    {
        return true;
    }

    ANGLE_VALIDATION_ERR(context, InvalidOperation(), UniformSizeMismatch);
    return false;
}

bool ValidateUniformMatrixValue(ValidationContext *context, GLenum valueType, GLenum uniformType)
{
    // Check that the value type is compatible with uniform type.
    if (valueType == uniformType)
    {
        return true;
    }

    context->handleError(InvalidOperation() << "wrong type of value for uniform");
    return false;
}

bool ValidateUniform(ValidationContext *context, GLenum valueType, GLint location, GLsizei count)
{
    const LinkedUniform *uniform = nullptr;
    gl::Program *programObject   = context->getGLState().getProgram();
    return ValidateUniformCommonBase(context, programObject, location, count, &uniform) &&
           ValidateUniformValue(context, valueType, uniform->type);
}

bool ValidateUniform1iv(ValidationContext *context,
                        GLint location,
                        GLsizei count,
                        const GLint *value)
{
    const LinkedUniform *uniform = nullptr;
    gl::Program *programObject   = context->getGLState().getProgram();
    return ValidateUniformCommonBase(context, programObject, location, count, &uniform) &&
           ValidateUniform1ivValue(context, uniform->type, count, value);
}

bool ValidateUniformMatrix(ValidationContext *context,
                           GLenum valueType,
                           GLint location,
                           GLsizei count,
                           GLboolean transpose)
{
    if (ConvertToBool(transpose) && context->getClientMajorVersion() < 3)
    {
        context->handleError(InvalidValue());
        return false;
    }

    const LinkedUniform *uniform = nullptr;
    gl::Program *programObject   = context->getGLState().getProgram();
    return ValidateUniformCommonBase(context, programObject, location, count, &uniform) &&
           ValidateUniformMatrixValue(context, valueType, uniform->type);
}

bool ValidateStateQuery(ValidationContext *context,
                        GLenum pname,
                        GLenum *nativeType,
                        unsigned int *numParams)
{
    if (!context->getQueryParameterInfo(pname, nativeType, numParams))
    {
        context->handleError(InvalidEnum());
        return false;
    }

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

    if (pname >= GL_DRAW_BUFFER0 && pname <= GL_DRAW_BUFFER15)
    {
        unsigned int colorAttachment = (pname - GL_DRAW_BUFFER0);

        if (colorAttachment >= caps.maxDrawBuffers)
        {
            context->handleError(InvalidOperation());
            return false;
        }
    }

    switch (pname)
    {
        case GL_TEXTURE_BINDING_2D:
        case GL_TEXTURE_BINDING_CUBE_MAP:
        case GL_TEXTURE_BINDING_3D:
        case GL_TEXTURE_BINDING_2D_ARRAY:
        case GL_TEXTURE_BINDING_2D_MULTISAMPLE:
            break;
        case GL_TEXTURE_BINDING_RECTANGLE_ANGLE:
            if (!context->getExtensions().textureRectangle)
            {
                context->handleError(InvalidEnum()
                                     << "ANGLE_texture_rectangle extension not present");
                return false;
            }
            break;
        case GL_TEXTURE_BINDING_EXTERNAL_OES:
            if (!context->getExtensions().eglStreamConsumerExternal &&
                !context->getExtensions().eglImageExternal)
            {
                context->handleError(InvalidEnum() << "Neither NV_EGL_stream_consumer_external "
                                                      "nor GL_OES_EGL_image_external "
                                                      "extensions enabled");
                return false;
            }
            break;

        case GL_IMPLEMENTATION_COLOR_READ_TYPE:
        case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
        {
            if (context->getGLState().getReadFramebuffer()->checkStatus(context) !=
                GL_FRAMEBUFFER_COMPLETE)
            {
                context->handleError(InvalidOperation());
                return false;
            }

            const Framebuffer *framebuffer = context->getGLState().getReadFramebuffer();
            ASSERT(framebuffer);

            if (framebuffer->getReadBufferState() == GL_NONE)
            {
                ANGLE_VALIDATION_ERR(context, InvalidOperation(), ReadBufferNone);
                return false;
            }

            const FramebufferAttachment *attachment = framebuffer->getReadColorbuffer();
            if (!attachment)
            {
                context->handleError(InvalidOperation());
                return false;
            }
        }
        break;

        default:
            break;
    }

    // pname is valid, but there are no parameters to return
    if (*numParams == 0)
    {
        return false;
    }

    return true;
}

bool ValidateRobustStateQuery(ValidationContext *context,
                              GLenum pname,
                              GLsizei bufSize,
                              GLenum *nativeType,
                              unsigned int *numParams)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateStateQuery(context, pname, nativeType, numParams))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *numParams))
    {
        return false;
    }

    return true;
}

bool ValidateCopyTexImageParametersBase(ValidationContext *context,
                                        TextureTarget target,
                                        GLint level,
                                        GLenum internalformat,
                                        bool isSubImage,
                                        GLint xoffset,
                                        GLint yoffset,
                                        GLint zoffset,
                                        GLint x,
                                        GLint y,
                                        GLsizei width,
                                        GLsizei height,
                                        GLint border,
                                        Format *textureFormatOut)
{
    TextureType texType = TextureTargetToType(target);

    if (xoffset < 0 || yoffset < 0 || zoffset < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeOffset);
        return false;
    }

    if (width < 0 || height < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeSize);
        return false;
    }

    if (std::numeric_limits<GLsizei>::max() - xoffset < width ||
        std::numeric_limits<GLsizei>::max() - yoffset < height)
    {
        context->handleError(InvalidValue());
        return false;
    }

    if (border != 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), InvalidBorder);
        return false;
    }

    if (!ValidMipLevel(context, texType, level))
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), InvalidMipLevel);
        return false;
    }

    const auto &state    = context->getGLState();
    Framebuffer *readFramebuffer = state.getReadFramebuffer();
    if (readFramebuffer->checkStatus(context) != GL_FRAMEBUFFER_COMPLETE)
    {
        context->handleError(InvalidFramebufferOperation());
        return false;
    }

    if (readFramebuffer->id() != 0 && readFramebuffer->getSamples(context) != 0)
    {
        context->handleError(InvalidOperation());
        return false;
    }

    if (readFramebuffer->getReadBufferState() == GL_NONE)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ReadBufferNone);
        return false;
    }

    // WebGL 1.0 [Section 6.26] Reading From a Missing Attachment
    // In OpenGL ES it is undefined what happens when an operation tries to read from a missing
    // attachment and WebGL defines it to be an error. We do the check unconditionally as the
    // situation is an application error that would lead to a crash in ANGLE.
    const FramebufferAttachment *source = readFramebuffer->getReadColorbuffer();
    if (source == nullptr)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), MissingReadAttachment);
        return false;
    }

    // ANGLE_multiview spec, Revision 1:
    // Calling CopyTexSubImage3D, CopyTexImage2D, or CopyTexSubImage2D will result in an
    // INVALID_FRAMEBUFFER_OPERATION error if the multi-view layout of the current read framebuffer
    // is not NONE.
    if (source->getMultiviewLayout() != GL_NONE)
    {
        context->handleError(InvalidFramebufferOperation()
                             << "The active read framebuffer object has multiview attachments.");
        return false;
    }

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

    GLuint maxDimension = 0;
    switch (texType)
    {
        case TextureType::_2D:
            maxDimension = caps.max2DTextureSize;
            break;

        case TextureType::CubeMap:
            maxDimension = caps.maxCubeMapTextureSize;
            break;

        case TextureType::Rectangle:
            maxDimension = caps.maxRectangleTextureSize;
            break;

        case TextureType::_2DArray:
            maxDimension = caps.max2DTextureSize;
            break;

        case TextureType::_3D:
            maxDimension = caps.max3DTextureSize;
            break;

        default:
            context->handleError(InvalidEnum());
            return false;
    }

    gl::Texture *texture = state.getTargetTexture(texType);
    if (!texture)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), TextureNotBound);
        return false;
    }

    if (texture->getImmutableFormat() && !isSubImage)
    {
        context->handleError(InvalidOperation());
        return false;
    }

    const gl::InternalFormat &formatInfo =
        isSubImage ? *texture->getFormat(target, level).info
                   : gl::GetInternalFormatInfo(internalformat, GL_UNSIGNED_BYTE);

    if (formatInfo.depthBits > 0 || formatInfo.compressed)
    {
        context->handleError(InvalidOperation());
        return false;
    }

    if (isSubImage)
    {
        if (static_cast<size_t>(xoffset + width) > texture->getWidth(target, level) ||
            static_cast<size_t>(yoffset + height) > texture->getHeight(target, level) ||
            static_cast<size_t>(zoffset) >= texture->getDepth(target, level))
        {
            context->handleError(InvalidValue());
            return false;
        }
    }
    else
    {
        if (texType == TextureType::CubeMap && width != height)
        {
            ANGLE_VALIDATION_ERR(context, InvalidValue(), CubemapIncomplete);
            return false;
        }

        if (!formatInfo.textureSupport(context->getClientVersion(), context->getExtensions()))
        {
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
            return false;
        }

        int maxLevelDimension = (maxDimension >> level);
        if (static_cast<int>(width) > maxLevelDimension ||
            static_cast<int>(height) > maxLevelDimension)
        {
            ANGLE_VALIDATION_ERR(context, InvalidValue(), ResourceMaxTextureSize);
            return false;
        }
    }

    if (textureFormatOut)
    {
        *textureFormatOut = texture->getFormat(target, level);
    }

    // Detect texture copying feedback loops for WebGL.
    if (context->getExtensions().webglCompatibility)
    {
        if (readFramebuffer->formsCopyingFeedbackLoopWith(texture->id(), level, zoffset))
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), FeedbackLoop);
            return false;
        }
    }

    return true;
}

bool ValidateDrawBase(ValidationContext *context, GLenum mode, GLsizei count)
{
    switch (mode)
    {
        case GL_POINTS:
        case GL_LINES:
        case GL_LINE_LOOP:
        case GL_LINE_STRIP:
        case GL_TRIANGLES:
        case GL_TRIANGLE_STRIP:
        case GL_TRIANGLE_FAN:
            break;
        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidDrawMode);
            return false;
    }

    if (count < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeCount);
        return false;
    }

    const State &state = context->getGLState();

    const Extensions &extensions = context->getExtensions();

    // WebGL buffers cannot be mapped/unmapped because the MapBufferRange, FlushMappedBufferRange,
    // and UnmapBuffer entry points are removed from the WebGL 2.0 API.
    // https://www.khronos.org/registry/webgl/specs/latest/2.0/#5.14
    if (!extensions.webglCompatibility)
    {
        // Check for mapped buffers
        // TODO(jmadill): Optimize this check for non - WebGL contexts.
        if (state.hasMappedBuffer(BufferBinding::Array))
        {
            context->handleError(InvalidOperation());
            return false;
        }
    }

    // Note: these separate values are not supported in WebGL, due to D3D's limitations. See
    // Section 6.10 of the WebGL 1.0 spec.
    Framebuffer *framebuffer = state.getDrawFramebuffer();
    if (context->getLimitations().noSeparateStencilRefsAndMasks || extensions.webglCompatibility)
    {
        const FramebufferAttachment *dsAttachment =
            framebuffer->getStencilOrDepthStencilAttachment();
        GLuint stencilBits                = dsAttachment ? dsAttachment->getStencilSize() : 0;
        GLuint minimumRequiredStencilMask = (1 << stencilBits) - 1;
        const DepthStencilState &depthStencilState = state.getDepthStencilState();

        bool differentRefs = state.getStencilRef() != state.getStencilBackRef();
        bool differentWritemasks =
            (depthStencilState.stencilWritemask & minimumRequiredStencilMask) !=
            (depthStencilState.stencilBackWritemask & minimumRequiredStencilMask);
        bool differentMasks = (depthStencilState.stencilMask & minimumRequiredStencilMask) !=
                              (depthStencilState.stencilBackMask & minimumRequiredStencilMask);

        if (differentRefs || differentWritemasks || differentMasks)
        {
            if (!extensions.webglCompatibility)
            {
                ERR() << "This ANGLE implementation does not support separate front/back stencil "
                         "writemasks, reference values, or stencil mask values.";
            }
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), StencilReferenceMaskOrMismatch);
            return false;
        }
    }

    if (framebuffer->checkStatus(context) != GL_FRAMEBUFFER_COMPLETE)
    {
        context->handleError(InvalidFramebufferOperation());
        return false;
    }

    gl::Program *program = state.getProgram();
    if (!program)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ProgramNotBound);
        return false;
    }

    // In OpenGL ES spec for UseProgram at section 7.3, trying to render without
    // vertex shader stage or fragment shader stage is a undefined behaviour.
    // But ANGLE should clearly generate an INVALID_OPERATION error instead of
    // produce undefined result.
    if (!program->hasLinkedVertexShader() || !program->hasLinkedFragmentShader())
    {
        context->handleError(InvalidOperation() << "It is a undefined behaviour to render without "
                                                   "vertex shader stage or fragment shader stage.");
        return false;
    }

    if (!program->validateSamplers(nullptr, context->getCaps()))
    {
        context->handleError(InvalidOperation());
        return false;
    }

    if (extensions.multiview)
    {
        const int programNumViews     = program->usesMultiview() ? program->getNumViews() : 1;
        const int framebufferNumViews = framebuffer->getNumViews();
        if (framebufferNumViews != programNumViews)
        {
            context->handleError(InvalidOperation() << "The number of views in the active program "
                                                       "and draw framebuffer does not match.");
            return false;
        }

        const TransformFeedback *transformFeedbackObject = state.getCurrentTransformFeedback();
        if (transformFeedbackObject != nullptr && transformFeedbackObject->isActive() &&
            framebufferNumViews > 1)
        {
            context->handleError(InvalidOperation()
                                 << "There is an active transform feedback object "
                                    "when the number of views in the active draw "
                                    "framebuffer is greater than 1.");
            return false;
        }

        if (extensions.disjointTimerQuery && framebufferNumViews > 1 &&
            state.isQueryActive(GL_TIME_ELAPSED_EXT))
        {
            context->handleError(InvalidOperation() << "There is an active query for target "
                                                       "GL_TIME_ELAPSED_EXT when the number of "
                                                       "views in the active draw framebuffer is "
                                                       "greater than 1.");
            return false;
        }
    }

    // Uniform buffer validation
    for (unsigned int uniformBlockIndex = 0;
         uniformBlockIndex < program->getActiveUniformBlockCount(); uniformBlockIndex++)
    {
        const gl::InterfaceBlock &uniformBlock = program->getUniformBlockByIndex(uniformBlockIndex);
        GLuint blockBinding                  = program->getUniformBlockBinding(uniformBlockIndex);
        const OffsetBindingPointer<Buffer> &uniformBuffer =
            state.getIndexedUniformBuffer(blockBinding);

        if (uniformBuffer.get() == nullptr)
        {
            // undefined behaviour
            context->handleError(
                InvalidOperation()
                << "It is undefined behaviour to have a used but unbound uniform buffer.");
            return false;
        }

        size_t uniformBufferSize = uniformBuffer.getSize();
        if (uniformBufferSize == 0)
        {
            // Bind the whole buffer.
            uniformBufferSize = static_cast<size_t>(uniformBuffer->getSize());
        }

        if (uniformBufferSize < uniformBlock.dataSize)
        {
            // undefined behaviour
            context->handleError(
                InvalidOperation()
                << "It is undefined behaviour to use a uniform buffer that is too small.");
            return false;
        }

        if (extensions.webglCompatibility &&
            uniformBuffer->isBoundForTransformFeedbackAndOtherUse())
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(),
                                 UniformBufferBoundForTransformFeedback);
            return false;
        }
    }

    // Do some additonal WebGL-specific validation
    if (extensions.webglCompatibility)
    {
        const TransformFeedback *transformFeedbackObject = state.getCurrentTransformFeedback();
        if (transformFeedbackObject != nullptr && transformFeedbackObject->isActive() &&
            transformFeedbackObject->buffersBoundForOtherUse())
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), TransformFeedbackBufferDoubleBound);
            return false;
        }
        // Detect rendering feedback loops for WebGL.
        if (framebuffer->formsRenderingFeedbackLoopWith(state))
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), FeedbackLoop);
            return false;
        }

        // Detect that the vertex shader input types match the attribute types
        if (!ValidateVertexShaderAttributeTypeMatch(context))
        {
            return false;
        }

        // Detect that the color buffer types match the fragment shader output types
        if (!ValidateFragmentShaderColorBufferTypeMatch(context))
        {
            return false;
        }
    }

    return true;
}

bool ValidateDrawArraysCommon(ValidationContext *context,
                              GLenum mode,
                              GLint first,
                              GLsizei count,
                              GLsizei primcount)
{
    if (first < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeStart);
        return false;
    }

    const State &state                          = context->getGLState();
    gl::TransformFeedback *curTransformFeedback = state.getCurrentTransformFeedback();
    if (curTransformFeedback && curTransformFeedback->isActive() &&
        !curTransformFeedback->isPaused() && curTransformFeedback->getPrimitiveMode() != mode)
    {
        // It is an invalid operation to call DrawArrays or DrawArraysInstanced with a draw mode
        // that does not match the current transform feedback object's draw mode (if transform
        // feedback
        // is active), (3.0.2, section 2.14, pg 86)
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), InvalidDrawModeTransformFeedback);
        return false;
    }

    if (!ValidateDrawBase(context, mode, count))
    {
        return false;
    }

    // Check the computation of maxVertex doesn't overflow.
    // - first < 0 has been checked as an error condition.
    // - if count < 0, skip validating no-op draw calls.
    // From this we know maxVertex will be positive, and only need to check if it overflows GLint.
    ASSERT(first >= 0);
    if (count > 0)
    {
        int64_t maxVertex = static_cast<int64_t>(first) + static_cast<int64_t>(count) - 1;
        if (maxVertex > static_cast<int64_t>(std::numeric_limits<GLint>::max()))
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), IntegerOverflow);
            return false;
        }

        if (!ValidateDrawAttribs(context, primcount, static_cast<GLint>(maxVertex), count))
        {
            return false;
        }
    }

    return true;
}

bool ValidateDrawArraysInstancedANGLE(Context *context,
                                      GLenum mode,
                                      GLint first,
                                      GLsizei count,
                                      GLsizei primcount)
{
    if (!context->getExtensions().instancedArrays)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ExtensionNotEnabled);
        return false;
    }

    if (!ValidateDrawArraysInstancedBase(context, mode, first, count, primcount))
    {
        return false;
    }

    return ValidateDrawInstancedANGLE(context);
}

bool ValidateDrawElementsBase(ValidationContext *context, GLenum type)
{
    switch (type)
    {
        case GL_UNSIGNED_BYTE:
        case GL_UNSIGNED_SHORT:
            break;
        case GL_UNSIGNED_INT:
            if (context->getClientMajorVersion() < 3 && !context->getExtensions().elementIndexUint)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), TypeNotUnsignedShortByte);
                return false;
            }
            break;
        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), TypeNotUnsignedShortByte);
            return false;
    }

    const State &state = context->getGLState();

    gl::TransformFeedback *curTransformFeedback = state.getCurrentTransformFeedback();
    if (curTransformFeedback && curTransformFeedback->isActive() &&
        !curTransformFeedback->isPaused())
    {
        // It is an invalid operation to call DrawElements, DrawRangeElements or
        // DrawElementsInstanced
        // while transform feedback is active, (3.0.2, section 2.14, pg 86)
        context->handleError(InvalidOperation());
        return false;
    }

    return true;
}

bool ValidateDrawElementsCommon(ValidationContext *context,
                                GLenum mode,
                                GLsizei count,
                                GLenum type,
                                const void *indices,
                                GLsizei primcount)
{
    if (!ValidateDrawElementsBase(context, type))
        return false;

    const State &state = context->getGLState();

    if (!ValidateDrawBase(context, mode, count))
    {
        return false;
    }

    // WebGL buffers cannot be mapped/unmapped because the MapBufferRange, FlushMappedBufferRange,
    // and UnmapBuffer entry points are removed from the WebGL 2.0 API.
    // https://www.khronos.org/registry/webgl/specs/latest/2.0/#5.14
    if (!context->getExtensions().webglCompatibility)
    {
        // Check for mapped buffers
        // TODO(jmadill): Optimize this check for non - WebGL contexts.
        if (state.hasMappedBuffer(gl::BufferBinding::ElementArray))
        {
            context->handleError(InvalidOperation() << "Index buffer is mapped.");
            return false;
        }
    }

    const gl::VertexArray *vao     = state.getVertexArray();
    gl::Buffer *elementArrayBuffer = vao->getElementArrayBuffer().get();

    GLuint typeBytes = gl::GetTypeInfo(type).bytes;

    if (context->getExtensions().webglCompatibility)
    {
        ASSERT(isPow2(typeBytes) && typeBytes > 0);
        if ((reinterpret_cast<uintptr_t>(indices) & static_cast<uintptr_t>(typeBytes - 1)) != 0)
        {
            // [WebGL 1.0] Section 6.4 Buffer Offset and Stride Requirements
            // The offset arguments to drawElements and [...], must be a multiple of the size of the
            // data type passed to the call, or an INVALID_OPERATION error is generated.
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), OffsetMustBeMultipleOfType);
            return false;
        }

        // [WebGL 1.0] Section 6.4 Buffer Offset and Stride Requirements
        // In addition the offset argument to drawElements must be non-negative or an INVALID_VALUE
        // error is generated.
        if (reinterpret_cast<intptr_t>(indices) < 0)
        {
            ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeOffset);
            return false;
        }
    }

    if (context->getExtensions().webglCompatibility ||
        !context->getGLState().areClientArraysEnabled())
    {
        if (!elementArrayBuffer && count > 0)
        {
            // [WebGL 1.0] Section 6.2 No Client Side Arrays
            // If drawElements is called with a count greater than zero, and no WebGLBuffer is bound
            // to the ELEMENT_ARRAY_BUFFER binding point, an INVALID_OPERATION error is generated.
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), MustHaveElementArrayBinding);
            return false;
        }
    }

    if (count > 0 && !elementArrayBuffer && !indices)
    {
        // This is an application error that would normally result in a crash, but we catch it and
        // return an error
        context->handleError(InvalidOperation() << "No element array buffer and no pointer.");
        return false;
    }

    if (count > 0 && elementArrayBuffer)
    {
        // The max possible type size is 8 and count is on 32 bits so doing the multiplication
        // in a 64 bit integer is safe. Also we are guaranteed that here count > 0.
        static_assert(std::is_same<int, GLsizei>::value, "GLsizei isn't the expected type");
        constexpr uint64_t kMaxTypeSize = 8;
        constexpr uint64_t kIntMax      = std::numeric_limits<int>::max();
        constexpr uint64_t kUint64Max   = std::numeric_limits<uint64_t>::max();
        static_assert(kIntMax < kUint64Max / kMaxTypeSize, "");

        uint64_t typeSize     = typeBytes;
        uint64_t elementCount = static_cast<uint64_t>(count);
        ASSERT(elementCount > 0 && typeSize <= kMaxTypeSize);

        // Doing the multiplication here is overflow-safe
        uint64_t elementDataSizeNoOffset = typeSize * elementCount;

        // The offset can be any value, check for overflows
        uint64_t offset = static_cast<uint64_t>(reinterpret_cast<uintptr_t>(indices));
        if (elementDataSizeNoOffset > kUint64Max - offset)
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), IntegerOverflow);
            return false;
        }

        uint64_t elementDataSizeWithOffset = elementDataSizeNoOffset + offset;
        if (elementDataSizeWithOffset > static_cast<uint64_t>(elementArrayBuffer->getSize()))
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), InsufficientBufferSize);
            return false;
        }

        ASSERT(isPow2(typeSize) && typeSize > 0);
        if ((elementArrayBuffer->getSize() & (typeSize - 1)) != 0)
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), MismatchedByteCountType);
            return false;
        }

        if (context->getExtensions().webglCompatibility &&
            elementArrayBuffer->isBoundForTransformFeedbackAndOtherUse())
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(),
                                 ElementArrayBufferBoundForTransformFeedback);
            return false;
        }
    }

    if (context->getExtensions().robustBufferAccessBehavior)
    {
        // Here we use maxVertex = 0 and vertexCount = 1 to avoid retrieving IndexRange when robust
        // access is enabled.
        if (!ValidateDrawAttribs(context, primcount, 0, 1))
        {
            return false;
        }
    }
    else if (count == 0)
    {
        // ValidateDrawAttribs also does some extra validation that is independent of the vertex
        // count.
        if (!ValidateDrawAttribs(context, 0, 0, 0))
        {
            return false;
        }
    }
    else
    {
        // Use the parameter buffer to retrieve and cache the index range.
        const auto &params        = context->getParams<HasIndexRange>();
        const auto &indexRangeOpt = params.getIndexRange();
        if (!indexRangeOpt.valid())
        {
            // Unexpected error.
            return false;
        }

        // If we use an index greater than our maximum supported index range, return an error.
        // The ES3 spec does not specify behaviour here, it is undefined, but ANGLE should always
        // return an error if possible here.
        if (static_cast<GLuint64>(indexRangeOpt.value().end) >= context->getCaps().maxElementIndex)
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), ExceedsMaxElement);
            return false;
        }

        if (!ValidateDrawAttribs(context, primcount, static_cast<GLint>(indexRangeOpt.value().end),
                                 static_cast<GLint>(indexRangeOpt.value().vertexCount())))
        {
            return false;
        }

        // No op if there are no real indices in the index data (all are primitive restart).
        return (indexRangeOpt.value().vertexIndexCount > 0);
    }

    return true;
}

bool ValidateDrawElementsInstancedCommon(ValidationContext *context,
                                         GLenum mode,
                                         GLsizei count,
                                         GLenum type,
                                         const void *indices,
                                         GLsizei primcount)
{
    return ValidateDrawElementsInstancedBase(context, mode, count, type, indices, primcount);
}

bool ValidateDrawElementsInstancedANGLE(Context *context,
                                        GLenum mode,
                                        GLsizei count,
                                        GLenum type,
                                        const void *indices,
                                        GLsizei primcount)
{
    if (!context->getExtensions().instancedArrays)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ExtensionNotEnabled);
        return false;
    }

    if (!ValidateDrawElementsInstancedBase(context, mode, count, type, indices, primcount))
    {
        return false;
    }

    return ValidateDrawInstancedANGLE(context);
}

bool ValidateFramebufferTextureBase(Context *context,
                                    GLenum target,
                                    GLenum attachment,
                                    GLuint texture,
                                    GLint level)
{
    if (!ValidFramebufferTarget(context, target))
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidFramebufferTarget);
        return false;
    }

    if (!ValidateAttachmentTarget(context, attachment))
    {
        return false;
    }

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

        if (tex == nullptr)
        {
            context->handleError(InvalidOperation());
            return false;
        }

        if (level < 0)
        {
            context->handleError(InvalidValue());
            return false;
        }
    }

    const gl::Framebuffer *framebuffer = context->getGLState().getTargetFramebuffer(target);
    ASSERT(framebuffer);

    if (framebuffer->id() == 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), DefaultFramebufferTarget);
        return false;
    }

    return true;
}

bool ValidateGetUniformBase(Context *context, GLuint program, GLint location)
{
    if (program == 0)
    {
        context->handleError(InvalidValue());
        return false;
    }

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

    if (!programObject || !programObject->isLinked())
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ProgramNotLinked);
        return false;
    }

    if (!programObject->isValidUniformLocation(location))
    {
        context->handleError(InvalidOperation());
        return false;
    }

    return true;
}

static bool ValidateSizedGetUniform(Context *context,
                                    GLuint program,
                                    GLint location,
                                    GLsizei bufSize,
                                    GLsizei *length)
{
    if (length)
    {
        *length = 0;
    }

    if (!ValidateGetUniformBase(context, program, location))
    {
        return false;
    }

    if (bufSize < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeBufferSize);
        return false;
    }

    gl::Program *programObject = context->getProgram(program);
    ASSERT(programObject);

    // sized queries -- ensure the provided buffer is large enough
    const LinkedUniform &uniform = programObject->getUniformByLocation(location);
    size_t requiredBytes         = VariableExternalSize(uniform.type);
    if (static_cast<size_t>(bufSize) < requiredBytes)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), InsufficientBufferSize);
        return false;
    }

    if (length)
    {
        *length = VariableComponentCount(uniform.type);
    }

    return true;
}

bool ValidateGetnUniformfvEXT(Context *context,
                              GLuint program,
                              GLint location,
                              GLsizei bufSize,
                              GLfloat *params)
{
    return ValidateSizedGetUniform(context, program, location, bufSize, nullptr);
}

bool ValidateGetnUniformivEXT(Context *context,
                              GLuint program,
                              GLint location,
                              GLsizei bufSize,
                              GLint *params)
{
    return ValidateSizedGetUniform(context, program, location, bufSize, nullptr);
}

bool ValidateGetUniformfvRobustANGLE(Context *context,
                                     GLuint program,
                                     GLint location,
                                     GLsizei bufSize,
                                     GLsizei *length,
                                     GLfloat *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    // bufSize is validated in ValidateSizedGetUniform
    return ValidateSizedGetUniform(context, program, location, bufSize, length);
}

bool ValidateGetUniformivRobustANGLE(Context *context,
                                     GLuint program,
                                     GLint location,
                                     GLsizei bufSize,
                                     GLsizei *length,
                                     GLint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    // bufSize is validated in ValidateSizedGetUniform
    return ValidateSizedGetUniform(context, program, location, bufSize, length);
}

bool ValidateGetUniformuivRobustANGLE(Context *context,
                                      GLuint program,
                                      GLint location,
                                      GLsizei bufSize,
                                      GLsizei *length,
                                      GLuint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (context->getClientMajorVersion() < 3)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ES3Required);
        return false;
    }

    // bufSize is validated in ValidateSizedGetUniform
    return ValidateSizedGetUniform(context, program, location, bufSize, length);
}

bool ValidateDiscardFramebufferBase(Context *context,
                                    GLenum target,
                                    GLsizei numAttachments,
                                    const GLenum *attachments,
                                    bool defaultFramebuffer)
{
    if (numAttachments < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeAttachments);
        return false;
    }

    for (GLsizei i = 0; i < numAttachments; ++i)
    {
        if (attachments[i] >= GL_COLOR_ATTACHMENT0 && attachments[i] <= GL_COLOR_ATTACHMENT31)
        {
            if (defaultFramebuffer)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), DefaultFramebufferInvalidAttachment);
                return false;
            }

            if (attachments[i] >= GL_COLOR_ATTACHMENT0 + context->getCaps().maxColorAttachments)
            {
                context->handleError(InvalidOperation() << "Requested color attachment is "
                                                           "greater than the maximum supported "
                                                           "color attachments");
                return false;
            }
        }
        else
        {
            switch (attachments[i])
            {
                case GL_DEPTH_ATTACHMENT:
                case GL_STENCIL_ATTACHMENT:
                case GL_DEPTH_STENCIL_ATTACHMENT:
                    if (defaultFramebuffer)
                    {
                        ANGLE_VALIDATION_ERR(context, InvalidEnum(),
                                             DefaultFramebufferInvalidAttachment);
                        return false;
                    }
                    break;
                case GL_COLOR:
                case GL_DEPTH:
                case GL_STENCIL:
                    if (!defaultFramebuffer)
                    {
                        ANGLE_VALIDATION_ERR(context, InvalidEnum(),
                                             DefaultFramebufferInvalidAttachment);
                        return false;
                    }
                    break;
                default:
                    ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidAttachment);
                    return false;
            }
        }
    }

    return true;
}

bool ValidateInsertEventMarkerEXT(Context *context, GLsizei length, const char *marker)
{
    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
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ExtensionNotEnabled);
        return false;
    }

    // Note that debug marker calls must not set error state
    if (length < 0)
    {
        return false;
    }

    if (marker == nullptr)
    {
        return false;
    }

    return true;
}

bool ValidatePushGroupMarkerEXT(Context *context, GLsizei length, const char *marker)
{
    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
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ExtensionNotEnabled);
        return false;
    }

    // Note that debug marker calls must not set error state
    if (length < 0)
    {
        return false;
    }

    if (length > 0 && marker == nullptr)
    {
        return false;
    }

    return true;
}

bool ValidateEGLImageTargetTexture2DOES(Context *context, TextureType type, GLeglImageOES image)
{
    if (!context->getExtensions().eglImage && !context->getExtensions().eglImageExternal)
    {
        context->handleError(InvalidOperation());
        return false;
    }

    switch (type)
    {
        case TextureType::_2D:
            if (!context->getExtensions().eglImage)
            {
                context->handleError(InvalidEnum()
                                     << "GL_TEXTURE_2D texture target requires GL_OES_EGL_image.");
            }
            break;

        case TextureType::External:
            if (!context->getExtensions().eglImageExternal)
            {
                context->handleError(InvalidEnum() << "GL_TEXTURE_EXTERNAL_OES texture target "
                                                      "requires GL_OES_EGL_image_external.");
            }
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidTextureTarget);
            return false;
    }

    egl::Image *imageObject = reinterpret_cast<egl::Image *>(image);

    ASSERT(context->getCurrentDisplay());
    if (!context->getCurrentDisplay()->isValidImage(imageObject))
    {
        context->handleError(InvalidValue() << "EGL image is not valid.");
        return false;
    }

    if (imageObject->getSamples() > 0)
    {
        context->handleError(InvalidOperation()
                             << "cannot create a 2D texture from a multisampled EGL image.");
        return false;
    }

    const TextureCaps &textureCaps =
        context->getTextureCaps().get(imageObject->getFormat().info->sizedInternalFormat);
    if (!textureCaps.texturable)
    {
        context->handleError(InvalidOperation()
                             << "EGL image internal format is not supported as a texture.");
        return false;
    }

    return true;
}

bool ValidateEGLImageTargetRenderbufferStorageOES(Context *context,
                                                  GLenum target,
                                                  GLeglImageOES image)
{
    if (!context->getExtensions().eglImage)
    {
        context->handleError(InvalidOperation());
        return false;
    }

    switch (target)
    {
        case GL_RENDERBUFFER:
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidRenderbufferTarget);
            return false;
    }

    egl::Image *imageObject = reinterpret_cast<egl::Image *>(image);

    ASSERT(context->getCurrentDisplay());
    if (!context->getCurrentDisplay()->isValidImage(imageObject))
    {
        context->handleError(InvalidValue() << "EGL image is not valid.");
        return false;
    }

    const TextureCaps &textureCaps =
        context->getTextureCaps().get(imageObject->getFormat().info->sizedInternalFormat);
    if (!textureCaps.renderable)
    {
        context->handleError(InvalidOperation()
                             << "EGL image internal format is not supported as a renderbuffer.");
        return false;
    }

    return true;
}

bool ValidateBindVertexArrayBase(Context *context, GLuint array)
{
    if (!context->isVertexArrayGenerated(array))
    {
        // The default VAO should always exist
        ASSERT(array != 0);
        context->handleError(InvalidOperation());
        return false;
    }

    return true;
}

bool ValidateProgramBinaryBase(Context *context,
                               GLuint program,
                               GLenum binaryFormat,
                               const void *binary,
                               GLint length)
{
    Program *programObject = GetValidProgram(context, program);
    if (programObject == nullptr)
    {
        return false;
    }

    const std::vector<GLenum> &programBinaryFormats = context->getCaps().programBinaryFormats;
    if (std::find(programBinaryFormats.begin(), programBinaryFormats.end(), binaryFormat) ==
        programBinaryFormats.end())
    {
        context->handleError(InvalidEnum() << "Program binary format is not valid.");
        return false;
    }

    if (context->hasActiveTransformFeedback(program))
    {
        // ES 3.0.4 section 2.15 page 91
        context->handleError(InvalidOperation() << "Cannot change program binary while program "
                                                   "is associated with an active transform "
                                                   "feedback object.");
        return false;
    }

    return true;
}

bool ValidateGetProgramBinaryBase(Context *context,
                                  GLuint program,
                                  GLsizei bufSize,
                                  GLsizei *length,
                                  GLenum *binaryFormat,
                                  void *binary)
{
    Program *programObject = GetValidProgram(context, program);
    if (programObject == nullptr)
    {
        return false;
    }

    if (!programObject->isLinked())
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ProgramNotLinked);
        return false;
    }

    if (context->getCaps().programBinaryFormats.empty())
    {
        context->handleError(InvalidOperation() << "No program binary formats supported.");
        return false;
    }

    return true;
}

bool ValidateDrawBuffersBase(ValidationContext *context, GLsizei n, const GLenum *bufs)
{
    // INVALID_VALUE is generated if n is negative or greater than value of MAX_DRAW_BUFFERS
    if (n < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeCount);
        return false;
    }
    if (static_cast<GLuint>(n) > context->getCaps().maxDrawBuffers)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), IndexExceedsMaxDrawBuffer);
        return false;
    }

    ASSERT(context->getGLState().getDrawFramebuffer());
    GLuint frameBufferId      = context->getGLState().getDrawFramebuffer()->id();
    GLuint maxColorAttachment = GL_COLOR_ATTACHMENT0_EXT + context->getCaps().maxColorAttachments;

    // This should come first before the check for the default frame buffer
    // because when we switch to ES3.1+, invalid enums will return INVALID_ENUM
    // rather than INVALID_OPERATION
    for (int colorAttachment = 0; colorAttachment < n; colorAttachment++)
    {
        const GLenum attachment = GL_COLOR_ATTACHMENT0_EXT + colorAttachment;

        if (bufs[colorAttachment] != GL_NONE && bufs[colorAttachment] != GL_BACK &&
            (bufs[colorAttachment] < GL_COLOR_ATTACHMENT0 ||
             bufs[colorAttachment] > GL_COLOR_ATTACHMENT31))
        {
            // Value in bufs is not NONE, BACK, or GL_COLOR_ATTACHMENTi
            // The 3.0.4 spec says to generate GL_INVALID_OPERATION here, but this
            // was changed to GL_INVALID_ENUM in 3.1, which dEQP also expects.
            // 3.1 is still a bit ambiguous about the error, but future specs are
            // expected to clarify that GL_INVALID_ENUM is the correct error.
            context->handleError(InvalidEnum() << "Invalid buffer value");
            return false;
        }
        else if (bufs[colorAttachment] >= maxColorAttachment)
        {
            context->handleError(InvalidOperation()
                                 << "Buffer value is greater than MAX_DRAW_BUFFERS");
            return false;
        }
        else if (bufs[colorAttachment] != GL_NONE && bufs[colorAttachment] != attachment &&
                 frameBufferId != 0)
        {
            // INVALID_OPERATION-GL is bound to buffer and ith argument
            // is not COLOR_ATTACHMENTi or NONE
            context->handleError(InvalidOperation()
                                 << "Ith value does not match COLOR_ATTACHMENTi or NONE");
            return false;
        }
    }

    // INVALID_OPERATION is generated if GL is bound to the default framebuffer
    // and n is not 1 or bufs is bound to value other than BACK and NONE
    if (frameBufferId == 0)
    {
        if (n != 1)
        {
            context->handleError(InvalidOperation()
                                 << "n must be 1 when GL is bound to the default framebuffer");
            return false;
        }

        if (bufs[0] != GL_NONE && bufs[0] != GL_BACK)
        {
            context->handleError(
                InvalidOperation()
                << "Only NONE or BACK are valid values when drawing to the default framebuffer");
            return false;
        }
    }

    return true;
}

bool ValidateGetBufferPointervBase(Context *context,
                                   BufferBinding target,
                                   GLenum pname,
                                   GLsizei *length,
                                   void **params)
{
    if (length)
    {
        *length = 0;
    }

    if (context->getClientMajorVersion() < 3 && !context->getExtensions().mapBuffer)
    {
        context->handleError(
            InvalidOperation()
            << "Context does not support OpenGL ES 3.0 or GL_OES_mapbuffer is not enabled.");
        return false;
    }

    if (!context->isValidBufferBinding(target))
    {
        context->handleError(InvalidEnum() << "Buffer target not valid");
        return false;
    }

    switch (pname)
    {
        case GL_BUFFER_MAP_POINTER:
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
            return false;
    }

    // GLES 3.0 section 2.10.1: "Attempts to attempts to modify or query buffer object state for a
    // target bound to zero generate an INVALID_OPERATION error."
    // GLES 3.1 section 6.6 explicitly specifies this error.
    if (context->getGLState().getTargetBuffer(target) == nullptr)
    {
        context->handleError(InvalidOperation()
                             << "Can not get pointer for reserved buffer name zero.");
        return false;
    }

    if (length)
    {
        *length = 1;
    }

    return true;
}

bool ValidateUnmapBufferBase(Context *context, BufferBinding target)
{
    if (!context->isValidBufferBinding(target))
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidBufferTypes);
        return false;
    }

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

    if (buffer == nullptr || !buffer->isMapped())
    {
        context->handleError(InvalidOperation() << "Buffer not mapped.");
        return false;
    }

    return true;
}

bool ValidateMapBufferRangeBase(Context *context,
                                BufferBinding target,
                                GLintptr offset,
                                GLsizeiptr length,
                                GLbitfield access)
{
    if (!context->isValidBufferBinding(target))
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidBufferTypes);
        return false;
    }

    if (offset < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeOffset);
        return false;
    }

    if (length < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeLength);
        return false;
    }

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

    if (!buffer)
    {
        context->handleError(InvalidOperation() << "Attempted to map buffer object zero.");
        return false;
    }

    // Check for buffer overflow
    CheckedNumeric<size_t> checkedOffset(offset);
    auto checkedSize = checkedOffset + length;

    if (!checkedSize.IsValid() || checkedSize.ValueOrDie() > static_cast<size_t>(buffer->getSize()))
    {
        context->handleError(InvalidValue() << "Mapped range does not fit into buffer dimensions.");
        return false;
    }

    // Check for invalid bits in the mask
    GLbitfield allAccessBits = GL_MAP_READ_BIT | GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_RANGE_BIT |
                               GL_MAP_INVALIDATE_BUFFER_BIT | GL_MAP_FLUSH_EXPLICIT_BIT |
                               GL_MAP_UNSYNCHRONIZED_BIT;

    if (access & ~(allAccessBits))
    {
        context->handleError(InvalidValue()
                             << "Invalid access bits: 0x" << std::hex << std::uppercase << access);
        return false;
    }

    if (length == 0)
    {
        context->handleError(InvalidOperation() << "Buffer mapping length is zero.");
        return false;
    }

    if (buffer->isMapped())
    {
        context->handleError(InvalidOperation() << "Buffer is already mapped.");
        return false;
    }

    // Check for invalid bit combinations
    if ((access & (GL_MAP_READ_BIT | GL_MAP_WRITE_BIT)) == 0)
    {
        context->handleError(InvalidOperation()
                             << "Need to map buffer for either reading or writing.");
        return false;
    }

    GLbitfield writeOnlyBits =
        GL_MAP_INVALIDATE_RANGE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT | GL_MAP_UNSYNCHRONIZED_BIT;

    if ((access & GL_MAP_READ_BIT) != 0 && (access & writeOnlyBits) != 0)
    {
        context->handleError(InvalidOperation()
                             << "Invalid access bits when mapping buffer for reading: 0x"
                             << std::hex << std::uppercase << access);
        return false;
    }

    if ((access & GL_MAP_WRITE_BIT) == 0 && (access & GL_MAP_FLUSH_EXPLICIT_BIT) != 0)
    {
        context->handleError(
            InvalidOperation()
            << "The explicit flushing bit may only be set if the buffer is mapped for writing.");
        return false;
    }

    return ValidateMapBufferBase(context, target);
}

bool ValidateFlushMappedBufferRangeBase(Context *context,
                                        BufferBinding target,
                                        GLintptr offset,
                                        GLsizeiptr length)
{
    if (offset < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeOffset);
        return false;
    }

    if (length < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeLength);
        return false;
    }

    if (!context->isValidBufferBinding(target))
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidBufferTypes);
        return false;
    }

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

    if (buffer == nullptr)
    {
        context->handleError(InvalidOperation() << "Attempted to flush buffer object zero.");
        return false;
    }

    if (!buffer->isMapped() || (buffer->getAccessFlags() & GL_MAP_FLUSH_EXPLICIT_BIT) == 0)
    {
        context->handleError(InvalidOperation()
                             << "Attempted to flush a buffer not mapped for explicit flushing.");
        return false;
    }

    // Check for buffer overflow
    CheckedNumeric<size_t> checkedOffset(offset);
    auto checkedSize = checkedOffset + length;

    if (!checkedSize.IsValid() ||
        checkedSize.ValueOrDie() > static_cast<size_t>(buffer->getMapLength()))
    {
        context->handleError(InvalidValue()
                             << "Flushed range does not fit into buffer mapping dimensions.");
        return false;
    }

    return true;
}

bool ValidateGenOrDelete(Context *context, GLint n)
{
    if (n < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeCount);
        return false;
    }
    return true;
}

bool ValidateRobustEntryPoint(ValidationContext *context, GLsizei bufSize)
{
    if (!context->getExtensions().robustClientMemory)
    {
        context->handleError(InvalidOperation()
                             << "GL_ANGLE_robust_client_memory is not available.");
        return false;
    }

    if (bufSize < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeBufferSize);
        return false;
    }

    return true;
}

bool ValidateRobustBufferSize(ValidationContext *context, GLsizei bufSize, GLsizei numParams)
{
    if (bufSize < numParams)
    {
        context->handleError(InvalidOperation() << numParams << " parameters are required but "
                                                << bufSize << " were provided.");
        return false;
    }

    return true;
}

bool ValidateGetFramebufferAttachmentParameterivBase(Context *context,
                                                     GLenum target,
                                                     GLenum attachment,
                                                     GLenum pname,
                                                     GLsizei *numParams)
{
    if (!ValidFramebufferTarget(context, target))
    {
        context->handleError(InvalidEnum());
        return false;
    }

    int clientVersion = context->getClientMajorVersion();

    switch (pname)
    {
        case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:
        case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL:
        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE:
            break;

        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_NUM_VIEWS_ANGLE:
        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_MULTIVIEW_LAYOUT_ANGLE:
        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_BASE_VIEW_INDEX_ANGLE:
        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_VIEWPORT_OFFSETS_ANGLE:
            if (clientVersion < 3 || !context->getExtensions().multiview)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
                return false;
            }
            break;

        case GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING:
            if (clientVersion < 3 && !context->getExtensions().sRGB)
            {
                context->handleError(InvalidEnum());
                return false;
            }
            break;

        case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
        case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
        case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
        case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
        case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
        case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
        case GL_FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE:
        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER:
            if (clientVersion < 3)
            {
                context->handleError(InvalidEnum());
                return false;
            }
            break;

        default:
            context->handleError(InvalidEnum());
            return false;
    }

    // Determine if the attachment is a valid enum
    switch (attachment)
    {
        case GL_BACK:
        case GL_DEPTH:
        case GL_STENCIL:
            if (clientVersion < 3)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidAttachment);
                return false;
            }
            break;

        case GL_DEPTH_STENCIL_ATTACHMENT:
            if (clientVersion < 3 && !context->isWebGL1())
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidAttachment);
                return false;
            }
            break;

        case GL_COLOR_ATTACHMENT0:
        case GL_DEPTH_ATTACHMENT:
        case GL_STENCIL_ATTACHMENT:
            break;

        default:
            if ((clientVersion < 3 && !context->getExtensions().drawBuffers) ||
                attachment < GL_COLOR_ATTACHMENT0_EXT ||
                (attachment - GL_COLOR_ATTACHMENT0_EXT) >= context->getCaps().maxColorAttachments)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidAttachment);
                return false;
            }
            break;
    }

    const Framebuffer *framebuffer = context->getGLState().getTargetFramebuffer(target);
    ASSERT(framebuffer);

    if (framebuffer->id() == 0)
    {
        if (clientVersion < 3)
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), DefaultFramebufferTarget);
            return false;
        }

        switch (attachment)
        {
            case GL_BACK:
            case GL_DEPTH:
            case GL_STENCIL:
                break;

            default:
                ANGLE_VALIDATION_ERR(context, InvalidOperation(), InvalidAttachment);
                return false;
        }
    }
    else
    {
        if (attachment >= GL_COLOR_ATTACHMENT0_EXT && attachment <= GL_COLOR_ATTACHMENT15_EXT)
        {
            // Valid attachment query
        }
        else
        {
            switch (attachment)
            {
                case GL_DEPTH_ATTACHMENT:
                case GL_STENCIL_ATTACHMENT:
                    break;

                case GL_DEPTH_STENCIL_ATTACHMENT:
                    if (!framebuffer->hasValidDepthStencil() && !context->isWebGL1())
                    {
                        context->handleError(InvalidOperation());
                        return false;
                    }
                    break;

                default:
                    ANGLE_VALIDATION_ERR(context, InvalidOperation(), InvalidAttachment);
                    return false;
            }
        }
    }

    const FramebufferAttachment *attachmentObject = framebuffer->getAttachment(context, attachment);
    if (attachmentObject)
    {
        ASSERT(attachmentObject->type() == GL_RENDERBUFFER ||
               attachmentObject->type() == GL_TEXTURE ||
               attachmentObject->type() == GL_FRAMEBUFFER_DEFAULT);

        switch (pname)
        {
            case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
                if (attachmentObject->type() != GL_RENDERBUFFER &&
                    attachmentObject->type() != GL_TEXTURE)
                {
                    ANGLE_VALIDATION_ERR(context, InvalidEnum(), FramebufferIncompleteAttachment);
                    return false;
                }
                break;

            case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL:
                if (attachmentObject->type() != GL_TEXTURE)
                {
                    ANGLE_VALIDATION_ERR(context, InvalidEnum(), FramebufferIncompleteAttachment);
                    return false;
                }
                break;

            case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE:
                if (attachmentObject->type() != GL_TEXTURE)
                {
                    ANGLE_VALIDATION_ERR(context, InvalidEnum(), FramebufferIncompleteAttachment);
                    return false;
                }
                break;

            case GL_FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE:
                if (attachment == GL_DEPTH_STENCIL_ATTACHMENT)
                {
                    ANGLE_VALIDATION_ERR(context, InvalidOperation(), InvalidAttachment);
                    return false;
                }
                break;

            case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER:
                if (attachmentObject->type() != GL_TEXTURE)
                {
                    ANGLE_VALIDATION_ERR(context, InvalidEnum(), FramebufferIncompleteAttachment);
                    return false;
                }
                break;

            default:
                break;
        }
    }
    else
    {
        // ES 2.0.25 spec pg 127 states that if the value of FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE
        // is NONE, then querying any other pname will generate INVALID_ENUM.

        // ES 3.0.2 spec pg 235 states that if the attachment type is none,
        // GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME will return zero and be an
        // INVALID_OPERATION for all other pnames

        switch (pname)
        {
            case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:
                break;

            case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
                if (clientVersion < 3)
                {
                    ANGLE_VALIDATION_ERR(context, InvalidEnum(),
                                         InvalidFramebufferAttachmentParameter);
                    return false;
                }
                break;

            default:
                if (clientVersion < 3)
                {
                    ANGLE_VALIDATION_ERR(context, InvalidEnum(),
                                         InvalidFramebufferAttachmentParameter);
                    return false;
                }
                else
                {
                    ANGLE_VALIDATION_ERR(context, InvalidOperation(),
                                         InvalidFramebufferAttachmentParameter);
                    return false;
                }
        }
    }

    if (numParams)
    {
        if (pname == GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_VIEWPORT_OFFSETS_ANGLE)
        {
            // Only when the viewport offsets are queried we can have a varying number of output
            // parameters.
            const int numViews = attachmentObject ? attachmentObject->getNumViews() : 1;
            *numParams         = numViews * 2;
        }
        else
        {
            // For all other queries we can have only one output parameter.
            *numParams = 1;
        }
    }

    return true;
}

bool ValidateGetFramebufferAttachmentParameterivRobustANGLE(Context *context,
                                                            GLenum target,
                                                            GLenum attachment,
                                                            GLenum pname,
                                                            GLsizei bufSize,
                                                            GLsizei *numParams)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetFramebufferAttachmentParameterivBase(context, target, attachment, pname,
                                                         numParams))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *numParams))
    {
        return false;
    }

    return true;
}

bool ValidateGetBufferParameterivRobustANGLE(ValidationContext *context,
                                             BufferBinding target,
                                             GLenum pname,
                                             GLsizei bufSize,
                                             GLsizei *length,
                                             GLint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetBufferParameterBase(context, target, pname, false, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetBufferParameteri64vRobustANGLE(ValidationContext *context,
                                               BufferBinding target,
                                               GLenum pname,
                                               GLsizei bufSize,
                                               GLsizei *length,
                                               GLint64 *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetBufferParameterBase(context, target, pname, false, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetProgramivBase(ValidationContext *context,
                              GLuint program,
                              GLenum pname,
                              GLsizei *numParams)
{
    // Currently, all GetProgramiv queries return 1 parameter
    if (numParams)
    {
        *numParams = 1;
    }

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

    switch (pname)
    {
        case GL_DELETE_STATUS:
        case GL_LINK_STATUS:
        case GL_VALIDATE_STATUS:
        case GL_INFO_LOG_LENGTH:
        case GL_ATTACHED_SHADERS:
        case GL_ACTIVE_ATTRIBUTES:
        case GL_ACTIVE_ATTRIBUTE_MAX_LENGTH:
        case GL_ACTIVE_UNIFORMS:
        case GL_ACTIVE_UNIFORM_MAX_LENGTH:
            break;

        case GL_PROGRAM_BINARY_LENGTH:
            if (context->getClientMajorVersion() < 3 && !context->getExtensions().getProgramBinary)
            {
                context->handleError(InvalidEnum() << "Querying GL_PROGRAM_BINARY_LENGTH "
                                                      "requires GL_OES_get_program_binary or "
                                                      "ES 3.0.");
                return false;
            }
            break;

        case GL_ACTIVE_UNIFORM_BLOCKS:
        case GL_ACTIVE_UNIFORM_BLOCK_MAX_NAME_LENGTH:
        case GL_TRANSFORM_FEEDBACK_BUFFER_MODE:
        case GL_TRANSFORM_FEEDBACK_VARYINGS:
        case GL_TRANSFORM_FEEDBACK_VARYING_MAX_LENGTH:
        case GL_PROGRAM_BINARY_RETRIEVABLE_HINT:
            if (context->getClientMajorVersion() < 3)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), ES3Required);
                return false;
            }
            break;

        case GL_PROGRAM_SEPARABLE:
        case GL_ACTIVE_ATOMIC_COUNTER_BUFFERS:
            if (context->getClientVersion() < Version(3, 1))
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), ES31Required);
                return false;
            }
            break;

        case GL_COMPUTE_WORK_GROUP_SIZE:
            if (context->getClientVersion() < Version(3, 1))
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), ES31Required);
                return false;
            }

            // [OpenGL ES 3.1] Chapter 7.12 Page 122
            // An INVALID_OPERATION error is generated if COMPUTE_WORK_GROUP_SIZE is queried for a
            // program which has not been linked successfully, or which does not contain objects to
            // form a compute shader.
            if (!programObject->isLinked())
            {
                ANGLE_VALIDATION_ERR(context, InvalidOperation(), ProgramNotLinked);
                return false;
            }
            if (!programObject->hasLinkedComputeShader())
            {
                ANGLE_VALIDATION_ERR(context, InvalidOperation(), NoActiveComputeShaderStage);
                return false;
            }
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
            return false;
    }

    return true;
}

bool ValidateGetProgramivRobustANGLE(Context *context,
                                     GLuint program,
                                     GLenum pname,
                                     GLsizei bufSize,
                                     GLsizei *numParams)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetProgramivBase(context, program, pname, numParams))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *numParams))
    {
        return false;
    }

    return true;
}

bool ValidateGetRenderbufferParameterivRobustANGLE(Context *context,
                                                   GLenum target,
                                                   GLenum pname,
                                                   GLsizei bufSize,
                                                   GLsizei *length,
                                                   GLint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetRenderbufferParameterivBase(context, target, pname, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetShaderivRobustANGLE(Context *context,
                                    GLuint shader,
                                    GLenum pname,
                                    GLsizei bufSize,
                                    GLsizei *length,
                                    GLint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetShaderivBase(context, shader, pname, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetTexParameterfvRobustANGLE(Context *context,
                                          TextureType target,
                                          GLenum pname,
                                          GLsizei bufSize,
                                          GLsizei *length,
                                          GLfloat *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetTexParameterBase(context, target, pname, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetTexParameterivRobustANGLE(Context *context,
                                          TextureType target,
                                          GLenum pname,
                                          GLsizei bufSize,
                                          GLsizei *length,
                                          GLint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetTexParameterBase(context, target, pname, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateTexParameterfvRobustANGLE(Context *context,
                                       TextureType target,
                                       GLenum pname,
                                       GLsizei bufSize,
                                       const GLfloat *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    return ValidateTexParameterBase(context, target, pname, bufSize, params);
}

bool ValidateTexParameterivRobustANGLE(Context *context,
                                       TextureType target,
                                       GLenum pname,
                                       GLsizei bufSize,
                                       const GLint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    return ValidateTexParameterBase(context, target, pname, bufSize, params);
}

bool ValidateGetSamplerParameterfvRobustANGLE(Context *context,
                                              GLuint sampler,
                                              GLenum pname,
                                              GLuint bufSize,
                                              GLsizei *length,
                                              GLfloat *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetSamplerParameterBase(context, sampler, pname, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetSamplerParameterivRobustANGLE(Context *context,
                                              GLuint sampler,
                                              GLenum pname,
                                              GLuint bufSize,
                                              GLsizei *length,
                                              GLint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetSamplerParameterBase(context, sampler, pname, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateSamplerParameterfvRobustANGLE(Context *context,
                                           GLuint sampler,
                                           GLenum pname,
                                           GLsizei bufSize,
                                           const GLfloat *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    return ValidateSamplerParameterBase(context, sampler, pname, bufSize, params);
}

bool ValidateSamplerParameterivRobustANGLE(Context *context,
                                           GLuint sampler,
                                           GLenum pname,
                                           GLsizei bufSize,
                                           const GLint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    return ValidateSamplerParameterBase(context, sampler, pname, bufSize, params);
}

bool ValidateGetVertexAttribfvRobustANGLE(Context *context,
                                          GLuint index,
                                          GLenum pname,
                                          GLsizei bufSize,
                                          GLsizei *length,
                                          GLfloat *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetVertexAttribBase(context, index, pname, length, false, false))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetVertexAttribivRobustANGLE(Context *context,
                                          GLuint index,
                                          GLenum pname,
                                          GLsizei bufSize,
                                          GLsizei *length,
                                          GLint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetVertexAttribBase(context, index, pname, length, false, false))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetVertexAttribPointervRobustANGLE(Context *context,
                                                GLuint index,
                                                GLenum pname,
                                                GLsizei bufSize,
                                                GLsizei *length,
                                                void **pointer)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetVertexAttribBase(context, index, pname, length, true, false))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetVertexAttribIivRobustANGLE(Context *context,
                                           GLuint index,
                                           GLenum pname,
                                           GLsizei bufSize,
                                           GLsizei *length,
                                           GLint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetVertexAttribBase(context, index, pname, length, false, true))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetVertexAttribIuivRobustANGLE(Context *context,
                                            GLuint index,
                                            GLenum pname,
                                            GLsizei bufSize,
                                            GLsizei *length,
                                            GLuint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetVertexAttribBase(context, index, pname, length, false, true))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetActiveUniformBlockivRobustANGLE(Context *context,
                                                GLuint program,
                                                GLuint uniformBlockIndex,
                                                GLenum pname,
                                                GLsizei bufSize,
                                                GLsizei *length,
                                                GLint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetActiveUniformBlockivBase(context, program, uniformBlockIndex, pname, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateGetInternalFormativRobustANGLE(Context *context,
                                            GLenum target,
                                            GLenum internalformat,
                                            GLenum pname,
                                            GLsizei bufSize,
                                            GLsizei *length,
                                            GLint *params)
{
    if (!ValidateRobustEntryPoint(context, bufSize))
    {
        return false;
    }

    if (!ValidateGetInternalFormativBase(context, target, internalformat, pname, bufSize, length))
    {
        return false;
    }

    if (!ValidateRobustBufferSize(context, bufSize, *length))
    {
        return false;
    }

    return true;
}

bool ValidateVertexFormatBase(ValidationContext *context,
                              GLuint attribIndex,
                              GLint size,
                              GLenum type,
                              GLboolean pureInteger)
{
    const Caps &caps = context->getCaps();
    if (attribIndex >= caps.maxVertexAttributes)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), IndexExceedsMaxVertexAttribute);
        return false;
    }

    if (size < 1 || size > 4)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), InvalidVertexAttrSize);
        return false;
    }

    switch (type)
    {
        case GL_BYTE:
        case GL_UNSIGNED_BYTE:
        case GL_SHORT:
        case GL_UNSIGNED_SHORT:
            break;

        case GL_INT:
        case GL_UNSIGNED_INT:
            if (context->getClientMajorVersion() < 3)
            {
                context->handleError(InvalidEnum()
                                     << "Vertex type not supported before OpenGL ES 3.0.");
                return false;
            }
            break;

        case GL_FIXED:
        case GL_FLOAT:
            if (pureInteger)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidTypePureInt);
                return false;
            }
            break;

        case GL_HALF_FLOAT:
            if (context->getClientMajorVersion() < 3)
            {
                context->handleError(InvalidEnum()
                                     << "Vertex type not supported before OpenGL ES 3.0.");
                return false;
            }
            if (pureInteger)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidTypePureInt);
                return false;
            }
            break;

        case GL_INT_2_10_10_10_REV:
        case GL_UNSIGNED_INT_2_10_10_10_REV:
            if (context->getClientMajorVersion() < 3)
            {
                context->handleError(InvalidEnum()
                                     << "Vertex type not supported before OpenGL ES 3.0.");
                return false;
            }
            if (pureInteger)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidTypePureInt);
                return false;
            }
            if (size != 4)
            {
                context->handleError(InvalidOperation() << "Type is INT_2_10_10_10_REV or "
                                                           "UNSIGNED_INT_2_10_10_10_REV and "
                                                           "size is not 4.");
                return false;
            }
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidType);
            return false;
    }

    return true;
}

// Perform validation from WebGL 2 section 5.10 "Invalid Clears":
// In the WebGL 2 API, trying to perform a clear when there is a mismatch between the type of the
// specified clear value and the type of a buffer that is being cleared generates an
// INVALID_OPERATION error instead of producing undefined results
bool ValidateWebGLFramebufferAttachmentClearType(ValidationContext *context,
                                                 GLint drawbuffer,
                                                 const GLenum *validComponentTypes,
                                                 size_t validComponentTypeCount)
{
    const FramebufferAttachment *attachment =
        context->getGLState().getDrawFramebuffer()->getDrawBuffer(drawbuffer);
    if (attachment)
    {
        GLenum componentType = attachment->getFormat().info->componentType;
        const GLenum *end    = validComponentTypes + validComponentTypeCount;
        if (std::find(validComponentTypes, end, componentType) == end)
        {
            context->handleError(
                InvalidOperation()
                << "No defined conversion between clear value and attachment format.");
            return false;
        }
    }

    return true;
}

bool ValidateRobustCompressedTexImageBase(ValidationContext *context,
                                          GLsizei imageSize,
                                          GLsizei dataSize)
{
    if (!ValidateRobustEntryPoint(context, dataSize))
    {
        return false;
    }

    gl::Buffer *pixelUnpackBuffer =
        context->getGLState().getTargetBuffer(BufferBinding::PixelUnpack);
    if (pixelUnpackBuffer == nullptr)
    {
        if (dataSize < imageSize)
        {
            context->handleError(InvalidOperation() << "dataSize must be at least " << imageSize);
        }
    }
    return true;
}

bool ValidateGetBufferParameterBase(ValidationContext *context,
                                    BufferBinding target,
                                    GLenum pname,
                                    bool pointerVersion,
                                    GLsizei *numParams)
{
    if (numParams)
    {
        *numParams = 0;
    }

    if (!context->isValidBufferBinding(target))
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidBufferTypes);
        return false;
    }

    const Buffer *buffer = context->getGLState().getTargetBuffer(target);
    if (!buffer)
    {
        // A null buffer means that "0" is bound to the requested buffer target
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), BufferNotBound);
        return false;
    }

    const Extensions &extensions = context->getExtensions();

    switch (pname)
    {
        case GL_BUFFER_USAGE:
        case GL_BUFFER_SIZE:
            break;

        case GL_BUFFER_ACCESS_OES:
            if (!extensions.mapBuffer)
            {
                context->handleError(InvalidEnum()
                                     << "pname requires OpenGL ES 3.0 or GL_OES_mapbuffer.");
                return false;
            }
            break;

        case GL_BUFFER_MAPPED:
            static_assert(GL_BUFFER_MAPPED == GL_BUFFER_MAPPED_OES, "GL enums should be equal.");
            if (context->getClientMajorVersion() < 3 && !extensions.mapBuffer &&
                !extensions.mapBufferRange)
            {
                context->handleError(InvalidEnum() << "pname requires OpenGL ES 3.0, "
                                                      "GL_OES_mapbuffer or "
                                                      "GL_EXT_map_buffer_range.");
                return false;
            }
            break;

        case GL_BUFFER_MAP_POINTER:
            if (!pointerVersion)
            {
                context->handleError(
                    InvalidEnum()
                    << "GL_BUFFER_MAP_POINTER can only be queried with GetBufferPointerv.");
                return false;
            }
            break;

        case GL_BUFFER_ACCESS_FLAGS:
        case GL_BUFFER_MAP_OFFSET:
        case GL_BUFFER_MAP_LENGTH:
            if (context->getClientMajorVersion() < 3 && !extensions.mapBufferRange)
            {
                context->handleError(InvalidEnum()
                                     << "pname requires OpenGL ES 3.0 or GL_EXT_map_buffer_range.");
                return false;
            }
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
            return false;
    }

    // All buffer parameter queries return one value.
    if (numParams)
    {
        *numParams = 1;
    }

    return true;
}

bool ValidateGetRenderbufferParameterivBase(Context *context,
                                            GLenum target,
                                            GLenum pname,
                                            GLsizei *length)
{
    if (length)
    {
        *length = 0;
    }

    if (target != GL_RENDERBUFFER)
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidRenderbufferTarget);
        return false;
    }

    Renderbuffer *renderbuffer = context->getGLState().getCurrentRenderbuffer();
    if (renderbuffer == nullptr)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), RenderbufferNotBound);
        return false;
    }

    switch (pname)
    {
        case GL_RENDERBUFFER_WIDTH:
        case GL_RENDERBUFFER_HEIGHT:
        case GL_RENDERBUFFER_INTERNAL_FORMAT:
        case GL_RENDERBUFFER_RED_SIZE:
        case GL_RENDERBUFFER_GREEN_SIZE:
        case GL_RENDERBUFFER_BLUE_SIZE:
        case GL_RENDERBUFFER_ALPHA_SIZE:
        case GL_RENDERBUFFER_DEPTH_SIZE:
        case GL_RENDERBUFFER_STENCIL_SIZE:
            break;

        case GL_RENDERBUFFER_SAMPLES_ANGLE:
            if (!context->getExtensions().framebufferMultisample)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), ExtensionNotEnabled);
                return false;
            }
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
            return false;
    }

    if (length)
    {
        *length = 1;
    }
    return true;
}

bool ValidateGetShaderivBase(Context *context, GLuint shader, GLenum pname, GLsizei *length)
{
    if (length)
    {
        *length = 0;
    }

    if (GetValidShader(context, shader) == nullptr)
    {
        return false;
    }

    switch (pname)
    {
        case GL_SHADER_TYPE:
        case GL_DELETE_STATUS:
        case GL_COMPILE_STATUS:
        case GL_INFO_LOG_LENGTH:
        case GL_SHADER_SOURCE_LENGTH:
            break;

        case GL_TRANSLATED_SHADER_SOURCE_LENGTH_ANGLE:
            if (!context->getExtensions().translatedShaderSource)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), ExtensionNotEnabled);
                return false;
            }
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
            return false;
    }

    if (length)
    {
        *length = 1;
    }
    return true;
}

bool ValidateGetTexParameterBase(Context *context,
                                 TextureType target,
                                 GLenum pname,
                                 GLsizei *length)
{
    if (length)
    {
        *length = 0;
    }

    if (!ValidTextureTarget(context, target) && !ValidTextureExternalTarget(context, target))
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidTextureTarget);
        return false;
    }

    if (context->getTargetTexture(target) == nullptr)
    {
        // Should only be possible for external textures
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), TextureNotBound);
        return false;
    }

    switch (pname)
    {
        case GL_TEXTURE_MAG_FILTER:
        case GL_TEXTURE_MIN_FILTER:
        case GL_TEXTURE_WRAP_S:
        case GL_TEXTURE_WRAP_T:
            break;

        case GL_TEXTURE_USAGE_ANGLE:
            if (!context->getExtensions().textureUsage)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), ExtensionNotEnabled);
                return false;
            }
            break;

        case GL_TEXTURE_MAX_ANISOTROPY_EXT:
            if (!ValidateTextureMaxAnisotropyExtensionEnabled(context))
            {
                return false;
            }
            break;

        case GL_TEXTURE_IMMUTABLE_FORMAT:
            if (context->getClientMajorVersion() < 3 && !context->getExtensions().textureStorage)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), ExtensionNotEnabled);
                return false;
            }
            break;

        case GL_TEXTURE_WRAP_R:
        case GL_TEXTURE_IMMUTABLE_LEVELS:
        case GL_TEXTURE_SWIZZLE_R:
        case GL_TEXTURE_SWIZZLE_G:
        case GL_TEXTURE_SWIZZLE_B:
        case GL_TEXTURE_SWIZZLE_A:
        case GL_TEXTURE_BASE_LEVEL:
        case GL_TEXTURE_MAX_LEVEL:
        case GL_TEXTURE_MIN_LOD:
        case GL_TEXTURE_MAX_LOD:
        case GL_TEXTURE_COMPARE_MODE:
        case GL_TEXTURE_COMPARE_FUNC:
            if (context->getClientMajorVersion() < 3)
            {
                context->handleError(InvalidEnum() << "pname requires OpenGL ES 3.0.");
                return false;
            }
            break;

        case GL_TEXTURE_SRGB_DECODE_EXT:
            if (!context->getExtensions().textureSRGBDecode)
            {
                context->handleError(InvalidEnum() << "GL_EXT_texture_sRGB_decode is not enabled.");
                return false;
            }
            break;

        case GL_DEPTH_STENCIL_TEXTURE_MODE:
            if (context->getClientVersion() < Version(3, 1))
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumRequiresGLES31);
                return false;
            }
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
            return false;
    }

    if (length)
    {
        *length = 1;
    }
    return true;
}

bool ValidateGetVertexAttribBase(Context *context,
                                 GLuint index,
                                 GLenum pname,
                                 GLsizei *length,
                                 bool pointer,
                                 bool pureIntegerEntryPoint)
{
    if (length)
    {
        *length = 0;
    }

    if (pureIntegerEntryPoint && context->getClientMajorVersion() < 3)
    {
        context->handleError(InvalidOperation() << "Context does not support OpenGL ES 3.0.");
        return false;
    }

    if (index >= context->getCaps().maxVertexAttributes)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), IndexExceedsMaxVertexAttribute);
        return false;
    }

    if (pointer)
    {
        if (pname != GL_VERTEX_ATTRIB_ARRAY_POINTER)
        {
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
            return false;
        }
    }
    else
    {
        switch (pname)
        {
            case GL_VERTEX_ATTRIB_ARRAY_ENABLED:
            case GL_VERTEX_ATTRIB_ARRAY_SIZE:
            case GL_VERTEX_ATTRIB_ARRAY_STRIDE:
            case GL_VERTEX_ATTRIB_ARRAY_TYPE:
            case GL_VERTEX_ATTRIB_ARRAY_NORMALIZED:
            case GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING:
            case GL_CURRENT_VERTEX_ATTRIB:
                break;

            case GL_VERTEX_ATTRIB_ARRAY_DIVISOR:
                static_assert(
                    GL_VERTEX_ATTRIB_ARRAY_DIVISOR == GL_VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE,
                    "ANGLE extension enums not equal to GL enums.");
                if (context->getClientMajorVersion() < 3 &&
                    !context->getExtensions().instancedArrays)
                {
                    context->handleError(InvalidEnum() << "GL_VERTEX_ATTRIB_ARRAY_DIVISOR "
                                                          "requires OpenGL ES 3.0 or "
                                                          "GL_ANGLE_instanced_arrays.");
                    return false;
                }
                break;

            case GL_VERTEX_ATTRIB_ARRAY_INTEGER:
                if (context->getClientMajorVersion() < 3)
                {
                    context->handleError(
                        InvalidEnum() << "GL_VERTEX_ATTRIB_ARRAY_INTEGER requires OpenGL ES 3.0.");
                    return false;
                }
                break;

            case GL_VERTEX_ATTRIB_BINDING:
            case GL_VERTEX_ATTRIB_RELATIVE_OFFSET:
                if (context->getClientVersion() < ES_3_1)
                {
                    context->handleError(InvalidEnum()
                                         << "Vertex Attrib Bindings require OpenGL ES 3.1.");
                    return false;
                }
                break;

            default:
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
                return false;
        }
    }

    if (length)
    {
        if (pname == GL_CURRENT_VERTEX_ATTRIB)
        {
            *length = 4;
        }
        else
        {
            *length = 1;
        }
    }

    return true;
}

bool ValidateReadPixelsBase(Context *context,
                            GLint x,
                            GLint y,
                            GLsizei width,
                            GLsizei height,
                            GLenum format,
                            GLenum type,
                            GLsizei bufSize,
                            GLsizei *length,
                            GLsizei *columns,
                            GLsizei *rows,
                            void *pixels)
{
    if (length != nullptr)
    {
        *length = 0;
    }
    if (rows != nullptr)
    {
        *rows = 0;
    }
    if (columns != nullptr)
    {
        *columns = 0;
    }

    if (width < 0 || height < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), NegativeSize);
        return false;
    }

    Framebuffer *readFramebuffer = context->getGLState().getReadFramebuffer();

    if (readFramebuffer->checkStatus(context) != GL_FRAMEBUFFER_COMPLETE)
    {
        context->handleError(InvalidFramebufferOperation());
        return false;
    }

    if (readFramebuffer->id() != 0 && readFramebuffer->getSamples(context) != 0)
    {
        context->handleError(InvalidOperation());
        return false;
    }

    const Framebuffer *framebuffer = context->getGLState().getReadFramebuffer();
    ASSERT(framebuffer);

    if (framebuffer->getReadBufferState() == GL_NONE)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ReadBufferNone);
        return false;
    }

    const FramebufferAttachment *readBuffer = framebuffer->getReadColorbuffer();
    // WebGL 1.0 [Section 6.26] Reading From a Missing Attachment
    // In OpenGL ES it is undefined what happens when an operation tries to read from a missing
    // attachment and WebGL defines it to be an error. We do the check unconditionnaly as the
    // situation is an application error that would lead to a crash in ANGLE.
    if (readBuffer == nullptr)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), MissingReadAttachment);
        return false;
    }

    // ANGLE_multiview, Revision 1:
    // ReadPixels generates an INVALID_FRAMEBUFFER_OPERATION error if the multi-view layout of the
    // current read framebuffer is not NONE.
    if (readBuffer->getMultiviewLayout() != GL_NONE)
    {
        context->handleError(InvalidFramebufferOperation()
                             << "Attempting to read from a multi-view framebuffer.");
        return false;
    }

    if (context->getExtensions().webglCompatibility)
    {
        // The ES 2.0 spec states that the format must be "among those defined in table 3.4,
        // excluding formats LUMINANCE and LUMINANCE_ALPHA.".  This requires validating the format
        // and type before validating the combination of format and type.  However, the
        // dEQP-GLES3.functional.negative_api.buffer.read_pixels passes GL_LUMINANCE as a format and
        // verifies that GL_INVALID_OPERATION is generated.
        // TODO(geofflang): Update this check to be done in all/no cases once this is resolved in
        // dEQP/WebGL.
        if (!ValidReadPixelsFormatEnum(context, format))
        {
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidFormat);
            return false;
        }

        if (!ValidReadPixelsTypeEnum(context, type))
        {
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidType);
            return false;
        }
    }

    GLenum currentFormat        = framebuffer->getImplementationColorReadFormat(context);
    GLenum currentType          = framebuffer->getImplementationColorReadType(context);
    GLenum currentComponentType = readBuffer->getFormat().info->componentType;

    bool validFormatTypeCombination =
        ValidReadPixelsFormatType(context, currentComponentType, format, type);

    if (!(currentFormat == format && currentType == type) && !validFormatTypeCombination)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), MismatchedTypeAndFormat);
        return false;
    }

    // Check for pixel pack buffer related API errors
    gl::Buffer *pixelPackBuffer = context->getGLState().getTargetBuffer(BufferBinding::PixelPack);
    if (pixelPackBuffer != nullptr && pixelPackBuffer->isMapped())
    {
        // ...the buffer object's data store is currently mapped.
        context->handleError(InvalidOperation() << "Pixel pack buffer is mapped.");
        return false;
    }
    if (context->getExtensions().webglCompatibility && pixelPackBuffer != nullptr &&
        pixelPackBuffer->isBoundForTransformFeedbackAndOtherUse())
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), PixelPackBufferBoundForTransformFeedback);
        return false;
    }

    // ..  the data would be packed to the buffer object such that the memory writes required
    // would exceed the data store size.
    const InternalFormat &formatInfo = GetInternalFormatInfo(format, type);
    const gl::Extents size(width, height, 1);
    const auto &pack = context->getGLState().getPackState();

    auto endByteOrErr = formatInfo.computePackUnpackEndByte(type, size, pack, false);
    if (endByteOrErr.isError())
    {
        context->handleError(endByteOrErr.getError());
        return false;
    }

    size_t endByte = endByteOrErr.getResult();
    if (bufSize >= 0)
    {
        if (pixelPackBuffer == nullptr && static_cast<size_t>(bufSize) < endByte)
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), InsufficientBufferSize);
            return false;
        }
    }

    if (pixelPackBuffer != nullptr)
    {
        CheckedNumeric<size_t> checkedEndByte(endByte);
        CheckedNumeric<size_t> checkedOffset(reinterpret_cast<size_t>(pixels));
        checkedEndByte += checkedOffset;

        if (checkedEndByte.ValueOrDie() > static_cast<size_t>(pixelPackBuffer->getSize()))
        {
            // Overflow past the end of the buffer
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), ParamOverflow);
            return false;
        }
    }

    if (pixelPackBuffer == nullptr && length != nullptr)
    {
        if (endByte > static_cast<size_t>(std::numeric_limits<GLsizei>::max()))
        {
            ANGLE_VALIDATION_ERR(context, InvalidOperation(), IntegerOverflow);
            return false;
        }

        *length = static_cast<GLsizei>(endByte);
    }

    auto getClippedExtent = [](GLint start, GLsizei length, int bufferSize, GLsizei *outExtent) {
        angle::CheckedNumeric<int> clippedExtent(length);
        if (start < 0)
        {
            // "subtract" the area that is less than 0
            clippedExtent += start;
        }

        angle::CheckedNumeric<int> readExtent = start;
        readExtent += length;
        if (!readExtent.IsValid())
        {
            return false;
        }

        if (readExtent.ValueOrDie() > bufferSize)
        {
            // Subtract the region to the right of the read buffer
            clippedExtent -= (readExtent - bufferSize);
        }

        if (!clippedExtent.IsValid())
        {
            return false;
        }

        *outExtent = std::max(clippedExtent.ValueOrDie(), 0);
        return true;
    };

    GLsizei writtenColumns = 0;
    if (!getClippedExtent(x, width, readBuffer->getSize().width, &writtenColumns))
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), IntegerOverflow);
        return false;
    }

    GLsizei writtenRows = 0;
    if (!getClippedExtent(y, height, readBuffer->getSize().height, &writtenRows))
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), IntegerOverflow);
        return false;
    }

    if (columns != nullptr)
    {
        *columns = writtenColumns;
    }

    if (rows != nullptr)
    {
        *rows = writtenRows;
    }

    return true;
}

template <typename ParamType>
bool ValidateTexParameterBase(Context *context,
                              TextureType target,
                              GLenum pname,
                              GLsizei bufSize,
                              const ParamType *params)
{
    if (!ValidTextureTarget(context, target) && !ValidTextureExternalTarget(context, target))
    {
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidTextureTarget);
        return false;
    }

    if (context->getTargetTexture(target) == nullptr)
    {
        // Should only be possible for external textures
        ANGLE_VALIDATION_ERR(context, InvalidEnum(), TextureNotBound);
        return false;
    }

    const GLsizei minBufSize = 1;
    if (bufSize >= 0 && bufSize < minBufSize)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), InsufficientBufferSize);
        return false;
    }

    switch (pname)
    {
        case GL_TEXTURE_WRAP_R:
        case GL_TEXTURE_SWIZZLE_R:
        case GL_TEXTURE_SWIZZLE_G:
        case GL_TEXTURE_SWIZZLE_B:
        case GL_TEXTURE_SWIZZLE_A:
        case GL_TEXTURE_BASE_LEVEL:
        case GL_TEXTURE_MAX_LEVEL:
        case GL_TEXTURE_COMPARE_MODE:
        case GL_TEXTURE_COMPARE_FUNC:
        case GL_TEXTURE_MIN_LOD:
        case GL_TEXTURE_MAX_LOD:
            if (context->getClientMajorVersion() < 3)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), ES3Required);
                return false;
            }
            if (target == TextureType::External && !context->getExtensions().eglImageExternalEssl3)
            {
                context->handleError(InvalidEnum() << "ES3 texture parameters are not "
                                                      "available without "
                                                      "GL_OES_EGL_image_external_essl3.");
                return false;
            }
            break;

        default:
            break;
    }

    if (target == TextureType::_2DMultisample)
    {
        switch (pname)
        {
            case GL_TEXTURE_MIN_FILTER:
            case GL_TEXTURE_MAG_FILTER:
            case GL_TEXTURE_WRAP_S:
            case GL_TEXTURE_WRAP_T:
            case GL_TEXTURE_WRAP_R:
            case GL_TEXTURE_MIN_LOD:
            case GL_TEXTURE_MAX_LOD:
            case GL_TEXTURE_COMPARE_MODE:
            case GL_TEXTURE_COMPARE_FUNC:
                context->handleError(InvalidEnum()
                                     << "Invalid parameter for 2D multisampled textures.");
                return false;
        }
    }

    switch (pname)
    {
        case GL_TEXTURE_WRAP_S:
        case GL_TEXTURE_WRAP_T:
        case GL_TEXTURE_WRAP_R:
            {
                bool restrictedWrapModes =
                    target == TextureType::External || target == TextureType::Rectangle;
                if (!ValidateTextureWrapModeValue(context, params, restrictedWrapModes))
                {
                    return false;
                }
            }
            break;

        case GL_TEXTURE_MIN_FILTER:
            {
                bool restrictedMinFilter =
                    target == TextureType::External || target == TextureType::Rectangle;
                if (!ValidateTextureMinFilterValue(context, params, restrictedMinFilter))
                {
                    return false;
                }
            }
            break;

        case GL_TEXTURE_MAG_FILTER:
            if (!ValidateTextureMagFilterValue(context, params))
            {
                return false;
            }
            break;

        case GL_TEXTURE_USAGE_ANGLE:
            if (!context->getExtensions().textureUsage)
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
                return false;
            }

            switch (ConvertToGLenum(params[0]))
            {
                case GL_NONE:
                case GL_FRAMEBUFFER_ATTACHMENT_ANGLE:
                    break;

                default:
                    ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
                    return false;
            }
            break;

        case GL_TEXTURE_MAX_ANISOTROPY_EXT:
            {
                GLfloat paramValue = static_cast<GLfloat>(params[0]);
                if (!ValidateTextureMaxAnisotropyValue(context, paramValue))
                {
                    return false;
                }
                ASSERT(static_cast<ParamType>(paramValue) == params[0]);
            }
            break;

        case GL_TEXTURE_MIN_LOD:
        case GL_TEXTURE_MAX_LOD:
            // any value is permissible
            break;

        case GL_TEXTURE_COMPARE_MODE:
            if (!ValidateTextureCompareModeValue(context, params))
            {
                return false;
            }
            break;

        case GL_TEXTURE_COMPARE_FUNC:
            if (!ValidateTextureCompareFuncValue(context, params))
            {
                return false;
            }
            break;

        case GL_TEXTURE_SWIZZLE_R:
        case GL_TEXTURE_SWIZZLE_G:
        case GL_TEXTURE_SWIZZLE_B:
        case GL_TEXTURE_SWIZZLE_A:
            switch (ConvertToGLenum(params[0]))
            {
                case GL_RED:
                case GL_GREEN:
                case GL_BLUE:
                case GL_ALPHA:
                case GL_ZERO:
                case GL_ONE:
                    break;

                default:
                    ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
                    return false;
            }
            break;

        case GL_TEXTURE_BASE_LEVEL:
            if (ConvertToGLint(params[0]) < 0)
            {
                context->handleError(InvalidValue() << "Base level must be at least 0.");
                return false;
            }
            if (target == TextureType::External && static_cast<GLuint>(params[0]) != 0)
            {
                context->handleError(InvalidOperation()
                                     << "Base level must be 0 for external textures.");
                return false;
            }
            if (target == TextureType::_2DMultisample && static_cast<GLuint>(params[0]) != 0)
            {
                context->handleError(InvalidOperation()
                                     << "Base level must be 0 for multisampled textures.");
                return false;
            }
            if (target == TextureType::Rectangle && static_cast<GLuint>(params[0]) != 0)
            {
                context->handleError(InvalidOperation()
                                     << "Base level must be 0 for rectangle textures.");
                return false;
            }
            break;

        case GL_TEXTURE_MAX_LEVEL:
            if (ConvertToGLint(params[0]) < 0)
            {
                ANGLE_VALIDATION_ERR(context, InvalidValue(), InvalidMipLevel);
                return false;
            }
            break;

        case GL_DEPTH_STENCIL_TEXTURE_MODE:
            if (context->getClientVersion() < Version(3, 1))
            {
                ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumRequiresGLES31);
                return false;
            }
            switch (ConvertToGLenum(params[0]))
            {
                case GL_DEPTH_COMPONENT:
                case GL_STENCIL_INDEX:
                    break;

                default:
                    ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
                    return false;
            }
            break;

        case GL_TEXTURE_SRGB_DECODE_EXT:
            if (!ValidateTextureSRGBDecodeValue(context, params))
            {
                return false;
            }
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
            return false;
    }

    return true;
}

template bool ValidateTexParameterBase(Context *, TextureType, GLenum, GLsizei, const GLfloat *);
template bool ValidateTexParameterBase(Context *, TextureType, GLenum, GLsizei, const GLint *);

bool ValidateVertexAttribIndex(ValidationContext *context, GLuint index)
{
    if (index >= MAX_VERTEX_ATTRIBS)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), IndexExceedsMaxVertexAttribute);
        return false;
    }

    return true;
}

bool ValidateGetActiveUniformBlockivBase(Context *context,
                                         GLuint program,
                                         GLuint uniformBlockIndex,
                                         GLenum pname,
                                         GLsizei *length)
{
    if (length)
    {
        *length = 0;
    }

    if (context->getClientMajorVersion() < 3)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ES3Required);
        return false;
    }

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

    if (uniformBlockIndex >= programObject->getActiveUniformBlockCount())
    {
        context->handleError(InvalidValue()
                             << "uniformBlockIndex exceeds active uniform block count.");
        return false;
    }

    switch (pname)
    {
        case GL_UNIFORM_BLOCK_BINDING:
        case GL_UNIFORM_BLOCK_DATA_SIZE:
        case GL_UNIFORM_BLOCK_NAME_LENGTH:
        case GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS:
        case GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES:
        case GL_UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER:
        case GL_UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER:
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
            return false;
    }

    if (length)
    {
        if (pname == GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES)
        {
            const InterfaceBlock &uniformBlock =
                programObject->getUniformBlockByIndex(uniformBlockIndex);
            *length = static_cast<GLsizei>(uniformBlock.memberIndexes.size());
        }
        else
        {
            *length = 1;
        }
    }

    return true;
}

template <typename ParamType>
bool ValidateSamplerParameterBase(Context *context,
                                  GLuint sampler,
                                  GLenum pname,
                                  GLsizei bufSize,
                                  ParamType *params)
{
    if (context->getClientMajorVersion() < 3)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ES3Required);
        return false;
    }

    if (!context->isSampler(sampler))
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), InvalidSampler);
        return false;
    }

    const GLsizei minBufSize = 1;
    if (bufSize >= 0 && bufSize < minBufSize)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), InsufficientBufferSize);
        return false;
    }

    switch (pname)
    {
        case GL_TEXTURE_WRAP_S:
        case GL_TEXTURE_WRAP_T:
        case GL_TEXTURE_WRAP_R:
            if (!ValidateTextureWrapModeValue(context, params, false))
            {
                return false;
            }
            break;

        case GL_TEXTURE_MIN_FILTER:
            if (!ValidateTextureMinFilterValue(context, params, false))
            {
                return false;
            }
            break;

        case GL_TEXTURE_MAG_FILTER:
            if (!ValidateTextureMagFilterValue(context, params))
            {
                return false;
            }
            break;

        case GL_TEXTURE_MIN_LOD:
        case GL_TEXTURE_MAX_LOD:
            // any value is permissible
            break;

        case GL_TEXTURE_COMPARE_MODE:
            if (!ValidateTextureCompareModeValue(context, params))
            {
                return false;
            }
            break;

        case GL_TEXTURE_COMPARE_FUNC:
            if (!ValidateTextureCompareFuncValue(context, params))
            {
                return false;
            }
            break;

        case GL_TEXTURE_SRGB_DECODE_EXT:
            if (!ValidateTextureSRGBDecodeValue(context, params))
            {
                return false;
            }
            break;

        case GL_TEXTURE_MAX_ANISOTROPY_EXT:
        {
            GLfloat paramValue = static_cast<GLfloat>(params[0]);
            if (!ValidateTextureMaxAnisotropyValue(context, paramValue))
            {
                return false;
            }
        }
        break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
            return false;
    }

    return true;
}

template bool ValidateSamplerParameterBase(Context *, GLuint, GLenum, GLsizei, GLfloat *);
template bool ValidateSamplerParameterBase(Context *, GLuint, GLenum, GLsizei, GLint *);

bool ValidateGetSamplerParameterBase(Context *context,
                                     GLuint sampler,
                                     GLenum pname,
                                     GLsizei *length)
{
    if (length)
    {
        *length = 0;
    }

    if (context->getClientMajorVersion() < 3)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ES3Required);
        return false;
    }

    if (!context->isSampler(sampler))
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), InvalidSampler);
        return false;
    }

    switch (pname)
    {
        case GL_TEXTURE_WRAP_S:
        case GL_TEXTURE_WRAP_T:
        case GL_TEXTURE_WRAP_R:
        case GL_TEXTURE_MIN_FILTER:
        case GL_TEXTURE_MAG_FILTER:
        case GL_TEXTURE_MIN_LOD:
        case GL_TEXTURE_MAX_LOD:
        case GL_TEXTURE_COMPARE_MODE:
        case GL_TEXTURE_COMPARE_FUNC:
            break;

        case GL_TEXTURE_MAX_ANISOTROPY_EXT:
            if (!ValidateTextureMaxAnisotropyExtensionEnabled(context))
            {
                return false;
            }
            break;

        case GL_TEXTURE_SRGB_DECODE_EXT:
            if (!context->getExtensions().textureSRGBDecode)
            {
                context->handleError(InvalidEnum() << "GL_EXT_texture_sRGB_decode is not enabled.");
                return false;
            }
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
            return false;
    }

    if (length)
    {
        *length = 1;
    }
    return true;
}

bool ValidateGetInternalFormativBase(Context *context,
                                     GLenum target,
                                     GLenum internalformat,
                                     GLenum pname,
                                     GLsizei bufSize,
                                     GLsizei *numParams)
{
    if (numParams)
    {
        *numParams = 0;
    }

    if (context->getClientMajorVersion() < 3)
    {
        ANGLE_VALIDATION_ERR(context, InvalidOperation(), ES3Required);
        return false;
    }

    const TextureCaps &formatCaps = context->getTextureCaps().get(internalformat);
    if (!formatCaps.renderable)
    {
        context->handleError(InvalidEnum() << "Internal format is not renderable.");
        return false;
    }

    switch (target)
    {
        case GL_RENDERBUFFER:
            break;

        case GL_TEXTURE_2D_MULTISAMPLE:
            if (context->getClientVersion() < ES_3_1)
            {
                context->handleError(InvalidOperation()
                                     << "Texture target requires at least OpenGL ES 3.1.");
                return false;
            }
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), InvalidTarget);
            return false;
    }

    if (bufSize < 0)
    {
        ANGLE_VALIDATION_ERR(context, InvalidValue(), InsufficientBufferSize);
        return false;
    }

    GLsizei maxWriteParams = 0;
    switch (pname)
    {
        case GL_NUM_SAMPLE_COUNTS:
            maxWriteParams = 1;
            break;

        case GL_SAMPLES:
            maxWriteParams = static_cast<GLsizei>(formatCaps.sampleCounts.size());
            break;

        default:
            ANGLE_VALIDATION_ERR(context, InvalidEnum(), EnumNotSupported);
            return false;
    }

    if (numParams)
    {
        // glGetInternalFormativ will not overflow bufSize
        *numParams = std::min(bufSize, maxWriteParams);
    }

    return true;
}

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

Commit

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