Program.cpp

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Author : Jamie Madill
Date : 2015-08-18 10:46:15
Hash : 5c42266e
Message : Make Program::usesPointSize D3D-only. This test is only used in the D3D code, so we can remove this Impl method. If we need it in the future we can always support it more generally from the translator, or handle it differently on each Renderer. BUG=angleproject:1123 Change-Id: Ic4a22ad6cec93726195e68200fc25cc2956be44c Reviewed-on: https://chromium-review.googlesource.com/293822 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>
src/libANGLE/Program.cpp
//
// Copyright (c) 2002-2014 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.
//

// Program.cpp: Implements the gl::Program class. Implements GL program objects
// and related functionality. [OpenGL ES 2.0.24] section 2.10.3 page 28.

#include "libANGLE/Program.h"

#include <algorithm>

#include "common/debug.h"
#include "common/platform.h"
#include "common/utilities.h"
#include "common/version.h"
#include "compiler/translator/blocklayout.h"
#include "libANGLE/Data.h"
#include "libANGLE/ResourceManager.h"
#include "libANGLE/features.h"
#include "libANGLE/renderer/Renderer.h"
#include "libANGLE/renderer/ProgramImpl.h"

namespace gl
{
const char * const g_fakepath = "C:\\fakepath";

namespace
{

unsigned int ParseAndStripArrayIndex(std::string* name)
{
    unsigned int subscript = GL_INVALID_INDEX;

    // Strip any trailing array operator and retrieve the subscript
    size_t open = name->find_last_of('[');
    size_t close = name->find_last_of(']');
    if (open != std::string::npos && close == name->length() - 1)
    {
        subscript = atoi(name->substr(open + 1).c_str());
        name->erase(open);
    }

    return subscript;
}

}

AttributeBindings::AttributeBindings()
{
}

AttributeBindings::~AttributeBindings()
{
}

InfoLog::InfoLog()
{
}

InfoLog::~InfoLog()
{
}

size_t InfoLog::getLength() const
{
    const std::string &logString = mStream.str();
    return logString.empty() ? 0 : logString.length() + 1;
}

void InfoLog::getLog(GLsizei bufSize, GLsizei *length, char *infoLog)
{
    size_t index = 0;

    if (bufSize > 0)
    {
        const std::string str(mStream.str());

        if (!str.empty())
        {
            index = std::min(static_cast<size_t>(bufSize) - 1, str.length());
            memcpy(infoLog, str.c_str(), index);
        }

        infoLog[index] = '\0';
    }

    if (length)
    {
        *length = static_cast<GLsizei>(index);
    }
}

// append a santized message to the program info log.
// The D3D compiler includes a fake file path in some of the warning or error 
// messages, so lets remove all occurrences of this fake file path from the log.
void InfoLog::appendSanitized(const char *message)
{
    std::string msg(message);

    size_t found;
    do
    {
        found = msg.find(g_fakepath);
        if (found != std::string::npos)
        {
            msg.erase(found, strlen(g_fakepath));
        }
    }
    while (found != std::string::npos);

    mStream << message << std::endl;
}

void InfoLog::reset()
{
}

VariableLocation::VariableLocation()
    : name(),
      element(0),
      index(0)
{
}

VariableLocation::VariableLocation(const std::string &name, unsigned int element, unsigned int index)
    : name(name),
      element(element),
      index(index)
{
}

LinkedVarying::LinkedVarying()
{
}

LinkedVarying::LinkedVarying(const std::string &name, GLenum type, GLsizei size, const std::string &semanticName,
                             unsigned int semanticIndex, unsigned int semanticIndexCount)
    : name(name), type(type), size(size), semanticName(semanticName), semanticIndex(semanticIndex), semanticIndexCount(semanticIndexCount)
{
}

Program::Data::Data()
    : mAttachedFragmentShader(nullptr),
      mAttachedVertexShader(nullptr),
      mTransformFeedbackBufferMode(GL_NONE)
{
}

Program::Data::~Data()
{
    if (mAttachedVertexShader != nullptr)
    {
        mAttachedVertexShader->release();
    }

    if (mAttachedFragmentShader != nullptr)
    {
        mAttachedFragmentShader->release();
    }
}

Program::Program(rx::ImplFactory *factory, ResourceManager *manager, GLuint handle)
    : mProgram(factory->createProgram(mData)),
      mLinkedAttributes(gl::MAX_VERTEX_ATTRIBS),
      mValidated(false),
      mLinked(false),
      mDeleteStatus(false),
      mRefCount(0),
      mResourceManager(manager),
      mHandle(handle)
{
    ASSERT(mProgram);

    resetUniformBlockBindings();
    unlink();
}

Program::~Program()
{
    unlink(true);

    SafeDelete(mProgram);
}

bool Program::attachShader(Shader *shader)
{
    if (shader->getType() == GL_VERTEX_SHADER)
    {
        if (mData.mAttachedVertexShader)
        {
            return false;
        }

        mData.mAttachedVertexShader = shader;
        mData.mAttachedVertexShader->addRef();
    }
    else if (shader->getType() == GL_FRAGMENT_SHADER)
    {
        if (mData.mAttachedFragmentShader)
        {
            return false;
        }

        mData.mAttachedFragmentShader = shader;
        mData.mAttachedFragmentShader->addRef();
    }
    else UNREACHABLE();

    return true;
}

bool Program::detachShader(Shader *shader)
{
    if (shader->getType() == GL_VERTEX_SHADER)
    {
        if (mData.mAttachedVertexShader != shader)
        {
            return false;
        }

        shader->release();
        mData.mAttachedVertexShader = nullptr;
    }
    else if (shader->getType() == GL_FRAGMENT_SHADER)
    {
        if (mData.mAttachedFragmentShader != shader)
        {
            return false;
        }

        shader->release();
        mData.mAttachedFragmentShader = nullptr;
    }
    else UNREACHABLE();

    return true;
}

int Program::getAttachedShadersCount() const
{
    return (mData.mAttachedVertexShader ? 1 : 0) + (mData.mAttachedFragmentShader ? 1 : 0);
}

void AttributeBindings::bindAttributeLocation(GLuint index, const char *name)
{
    if (index < MAX_VERTEX_ATTRIBS)
    {
        for (int i = 0; i < MAX_VERTEX_ATTRIBS; i++)
        {
            mAttributeBinding[i].erase(name);
        }

        mAttributeBinding[index].insert(name);
    }
}

void Program::bindAttributeLocation(GLuint index, const char *name)
{
    mAttributeBindings.bindAttributeLocation(index, name);
    mProgram->bindAttributeLocation(index, name);
}

// Links the HLSL code of the vertex and pixel shader by matching up their varyings,
// compiling them into binaries, determining the attribute mappings, and collecting
// a list of uniforms
Error Program::link(const gl::Data &data)
{
    unlink(false);

    mInfoLog.reset();
    resetUniformBlockBindings();

    if (!mData.mAttachedFragmentShader || !mData.mAttachedFragmentShader->isCompiled())
    {
        return Error(GL_NO_ERROR);
    }
    ASSERT(mData.mAttachedFragmentShader->getType() == GL_FRAGMENT_SHADER);

    if (!mData.mAttachedVertexShader || !mData.mAttachedVertexShader->isCompiled())
    {
        return Error(GL_NO_ERROR);
    }
    ASSERT(mData.mAttachedVertexShader->getType() == GL_VERTEX_SHADER);

    if (!linkAttributes(data, mInfoLog, mAttributeBindings, mData.mAttachedVertexShader))
    {
        return Error(GL_NO_ERROR);
    }

    if (!linkVaryings(mInfoLog, mData.mAttachedVertexShader, mData.mAttachedFragmentShader))
    {
        return Error(GL_NO_ERROR);
    }

    if (!linkUniforms(mInfoLog, *data.caps))
    {
        return Error(GL_NO_ERROR);
    }

    if (!linkUniformBlocks(mInfoLog, *data.caps))
    {
        return Error(GL_NO_ERROR);
    }

    const auto &mergedVaryings = getMergedVaryings();

    if (!linkValidateTransformFeedback(mInfoLog, mergedVaryings, *data.caps))
    {
        return Error(GL_NO_ERROR);
    }

    rx::LinkResult result = mProgram->link(data, mInfoLog, mData.mAttachedFragmentShader,
                                           mData.mAttachedVertexShader, &mOutputVariables);

    if (result.error.isError() || !result.linkSuccess)
    {
        return result.error;
    }

    gatherTransformFeedbackVaryings(mergedVaryings);

    mLinked = true;
    return gl::Error(GL_NO_ERROR);
}

int AttributeBindings::getAttributeBinding(const std::string &name) const
{
    for (int location = 0; location < MAX_VERTEX_ATTRIBS; location++)
    {
        if (mAttributeBinding[location].find(name) != mAttributeBinding[location].end())
        {
            return location;
        }
    }

    return -1;
}

// Returns the program object to an unlinked state, before re-linking, or at destruction
void Program::unlink(bool destroy)
{
    if (destroy)   // Object being destructed
    {
        if (mData.mAttachedFragmentShader)
        {
            mData.mAttachedFragmentShader->release();
            mData.mAttachedFragmentShader = nullptr;
        }

        if (mData.mAttachedVertexShader)
        {
            mData.mAttachedVertexShader->release();
            mData.mAttachedVertexShader = nullptr;
        }
    }

    mLinkedAttributes.assign(mLinkedAttributes.size(), sh::Attribute());
    mData.mTransformFeedbackVaryingVars.clear();

    mProgram->reset();

    mValidated = false;

    mLinked = false;
}

bool Program::isLinked()
{
    return mLinked;
}

Error Program::loadBinary(GLenum binaryFormat, const void *binary, GLsizei length)
{
    unlink(false);

#if ANGLE_PROGRAM_BINARY_LOAD != ANGLE_ENABLED
    return Error(GL_NO_ERROR);
#else
    ASSERT(binaryFormat == mProgram->getBinaryFormat());

    BinaryInputStream stream(binary, length);

    GLenum format = stream.readInt<GLenum>();
    if (format != mProgram->getBinaryFormat())
    {
        mInfoLog << "Invalid program binary format.";
        return Error(GL_NO_ERROR);
    }

    int majorVersion = stream.readInt<int>();
    int minorVersion = stream.readInt<int>();
    if (majorVersion != ANGLE_MAJOR_VERSION || minorVersion != ANGLE_MINOR_VERSION)
    {
        mInfoLog << "Invalid program binary version.";
        return Error(GL_NO_ERROR);
    }

    unsigned char commitString[ANGLE_COMMIT_HASH_SIZE];
    stream.readBytes(commitString, ANGLE_COMMIT_HASH_SIZE);
    if (memcmp(commitString, ANGLE_COMMIT_HASH, sizeof(unsigned char) * ANGLE_COMMIT_HASH_SIZE) != 0)
    {
        mInfoLog << "Invalid program binary version.";
        return Error(GL_NO_ERROR);
    }

    // TODO(jmadill): replace MAX_VERTEX_ATTRIBS
    for (int i = 0; i < MAX_VERTEX_ATTRIBS; ++i)
    {
        stream.readInt(&mLinkedAttributes[i].type);
        stream.readString(&mLinkedAttributes[i].name);
        stream.readInt(&mProgram->getSemanticIndexes()[i]);
    }

    unsigned int attribCount = stream.readInt<unsigned int>();
    for (unsigned int attribIndex = 0; attribIndex < attribCount; ++attribIndex)
    {
        GLenum type = stream.readInt<GLenum>();
        GLenum precision = stream.readInt<GLenum>();
        std::string name = stream.readString();
        GLint arraySize = stream.readInt<GLint>();
        int location = stream.readInt<int>();
        mProgram->setShaderAttribute(attribIndex, type, precision, name, arraySize, location);
    }

    stream.readInt(&mData.mTransformFeedbackBufferMode);

    rx::LinkResult result = mProgram->load(mInfoLog, &stream);
    if (result.error.isError() || !result.linkSuccess)
    {
        return result.error;
    }

    mLinked = true;
    return Error(GL_NO_ERROR);
#endif // #if ANGLE_PROGRAM_BINARY_LOAD == ANGLE_ENABLED
}

Error Program::saveBinary(GLenum *binaryFormat, void *binary, GLsizei bufSize, GLsizei *length) const
{
    if (binaryFormat)
    {
        *binaryFormat = mProgram->getBinaryFormat();
    }

    BinaryOutputStream stream;

    stream.writeInt(mProgram->getBinaryFormat());
    stream.writeInt(ANGLE_MAJOR_VERSION);
    stream.writeInt(ANGLE_MINOR_VERSION);
    stream.writeBytes(reinterpret_cast<const unsigned char*>(ANGLE_COMMIT_HASH), ANGLE_COMMIT_HASH_SIZE);

    // TODO(jmadill): replace MAX_VERTEX_ATTRIBS
    for (unsigned int i = 0; i < MAX_VERTEX_ATTRIBS; ++i)
    {
        stream.writeInt(mLinkedAttributes[i].type);
        stream.writeString(mLinkedAttributes[i].name);
        stream.writeInt(mProgram->getSemanticIndexes()[i]);
    }

    const auto &shaderAttributes = mProgram->getShaderAttributes();
    stream.writeInt(shaderAttributes.size());
    for (const auto &attrib : shaderAttributes)
    {
        stream.writeInt(attrib.type);
        stream.writeInt(attrib.precision);
        stream.writeString(attrib.name);
        stream.writeInt(attrib.arraySize);
        stream.writeInt(attrib.location);
    }

    stream.writeInt(mData.mTransformFeedbackBufferMode);

    gl::Error error = mProgram->save(&stream);
    if (error.isError())
    {
        return error;
    }

    GLsizei streamLength   = static_cast<GLsizei>(stream.length());
    const void *streamData = stream.data();

    if (streamLength > bufSize)
    {
        if (length)
        {
            *length = 0;
        }

        // TODO: This should be moved to the validation layer but computing the size of the binary before saving
        // it causes the save to happen twice.  It may be possible to write the binary to a separate buffer, validate
        // sizes and then copy it.
        return Error(GL_INVALID_OPERATION);
    }

    if (binary)
    {
        char *ptr = reinterpret_cast<char*>(binary);

        memcpy(ptr, streamData, streamLength);
        ptr += streamLength;

        ASSERT(ptr - streamLength == binary);
    }

    if (length)
    {
        *length = streamLength;
    }

    return Error(GL_NO_ERROR);
}

GLint Program::getBinaryLength() const
{
    GLint length;
    Error error = saveBinary(nullptr, nullptr, std::numeric_limits<GLint>::max(), &length);
    if (error.isError())
    {
        return 0;
    }

    return length;
}

void Program::release()
{
    mRefCount--;

    if (mRefCount == 0 && mDeleteStatus)
    {
        mResourceManager->deleteProgram(mHandle);
    }
}

void Program::addRef()
{
    mRefCount++;
}

unsigned int Program::getRefCount() const
{
    return mRefCount;
}

int Program::getInfoLogLength() const
{
    return static_cast<int>(mInfoLog.getLength());
}

void Program::getInfoLog(GLsizei bufSize, GLsizei *length, char *infoLog)
{
    return mInfoLog.getLog(bufSize, length, infoLog);
}

void Program::getAttachedShaders(GLsizei maxCount, GLsizei *count, GLuint *shaders)
{
    int total = 0;

    if (mData.mAttachedVertexShader)
    {
        if (total < maxCount)
        {
            shaders[total] = mData.mAttachedVertexShader->getHandle();
        }

        total++;
    }

    if (mData.mAttachedFragmentShader)
    {
        if (total < maxCount)
        {
            shaders[total] = mData.mAttachedFragmentShader->getHandle();
        }

        total++;
    }

    if (count)
    {
        *count = total;
    }
}

GLuint Program::getAttributeLocation(const std::string &name)
{
    for (size_t index = 0; index < mLinkedAttributes.size(); index++)
    {
        if (mLinkedAttributes[index].name == name)
        {
            return static_cast<GLuint>(index);
        }
    }

    return static_cast<GLuint>(-1);
}

const int *Program::getSemanticIndexes() const
{
    return mProgram->getSemanticIndexes();
}

int Program::getSemanticIndex(int attributeIndex) const
{
    ASSERT(attributeIndex >= 0 && attributeIndex < MAX_VERTEX_ATTRIBS);

    return mProgram->getSemanticIndexes()[attributeIndex];
}

void Program::getActiveAttribute(GLuint index, GLsizei bufsize, GLsizei *length, GLint *size, GLenum *type, GLchar *name)
{
    if (mLinked)
    {
        // Skip over inactive attributes
        unsigned int activeAttribute = 0;
        unsigned int attribute;
        for (attribute = 0; attribute < static_cast<unsigned int>(mLinkedAttributes.size());
             attribute++)
        {
            if (mLinkedAttributes[attribute].name.empty())
            {
                continue;
            }

            if (activeAttribute == index)
            {
                break;
            }

            activeAttribute++;
        }

        if (bufsize > 0)
        {
            const char *string = mLinkedAttributes[attribute].name.c_str();

            strncpy(name, string, bufsize);
            name[bufsize - 1] = '\0';

            if (length)
            {
                *length = static_cast<GLsizei>(strlen(name));
            }
        }

        *size = 1;   // Always a single 'type' instance

        *type = mLinkedAttributes[attribute].type;
    }
    else
    {
        if (bufsize > 0)
        {
            name[0] = '\0';
        }

        if (length)
        {
            *length = 0;
        }

        *type = GL_NONE;
        *size = 1;
    }
}

GLint Program::getActiveAttributeCount()
{
    int count = 0;

    if (mLinked)
    {
        for (int attributeIndex = 0; attributeIndex < MAX_VERTEX_ATTRIBS; attributeIndex++)
        {
            if (!mLinkedAttributes[attributeIndex].name.empty())
            {
                count++;
            }
        }
    }

    return count;
}

GLint Program::getActiveAttributeMaxLength()
{
    GLint maxLength = 0;

    if (mLinked)
    {
        for (int attributeIndex = 0; attributeIndex < MAX_VERTEX_ATTRIBS; attributeIndex++)
        {
            if (!mLinkedAttributes[attributeIndex].name.empty())
            {
                maxLength = std::max(
                    static_cast<GLint>(mLinkedAttributes[attributeIndex].name.length() + 1),
                    maxLength);
            }
        }
    }

    return maxLength;
}

// Returns one more than the highest sampler index used.
GLint Program::getUsedSamplerRange(SamplerType type)
{
    return mProgram->getUsedSamplerRange(type);
}

GLint Program::getSamplerMapping(SamplerType type, unsigned int samplerIndex, const Caps &caps)
{
    return mProgram->getSamplerMapping(type, samplerIndex, caps);
}

GLenum Program::getSamplerTextureType(SamplerType type, unsigned int samplerIndex)
{
    return mProgram->getSamplerTextureType(type, samplerIndex);
}

GLint Program::getFragDataLocation(const std::string &name) const
{
    std::string baseName(name);
    unsigned int arrayIndex = ParseAndStripArrayIndex(&baseName);
    for (auto outputPair : mOutputVariables)
    {
        const VariableLocation &outputVariable = outputPair.second;
        if (outputVariable.name == baseName && (arrayIndex == GL_INVALID_INDEX || arrayIndex == outputVariable.element))
        {
            return static_cast<GLint>(outputPair.first);
        }
    }
    return -1;
}

void Program::getActiveUniform(GLuint index, GLsizei bufsize, GLsizei *length, GLint *size, GLenum *type, GLchar *name)
{
    if (mLinked)
    {
        ASSERT(index < mProgram->getUniforms().size());   // index must be smaller than getActiveUniformCount()
        LinkedUniform *uniform = mProgram->getUniforms()[index];

        if (bufsize > 0)
        {
            std::string string = uniform->name;
            if (uniform->isArray())
            {
                string += "[0]";
            }

            strncpy(name, string.c_str(), bufsize);
            name[bufsize - 1] = '\0';

            if (length)
            {
                *length = static_cast<GLsizei>(strlen(name));
            }
        }

        *size = uniform->elementCount();
        *type = uniform->type;
    }
    else
    {
        if (bufsize > 0)
        {
            name[0] = '\0';
        }

        if (length)
        {
            *length = 0;
        }

        *size = 0;
        *type = GL_NONE;
    }
}

GLint Program::getActiveUniformCount()
{
    if (mLinked)
    {
        return static_cast<GLint>(mProgram->getUniforms().size());
    }
    else
    {
        return 0;
    }
}

GLint Program::getActiveUniformMaxLength()
{
    int maxLength = 0;

    if (mLinked)
    {
        unsigned int numUniforms = static_cast<unsigned int>(mProgram->getUniforms().size());
        for (unsigned int uniformIndex = 0; uniformIndex < numUniforms; uniformIndex++)
        {
            if (!mProgram->getUniforms()[uniformIndex]->name.empty())
            {
                int length = (int)(mProgram->getUniforms()[uniformIndex]->name.length() + 1);
                if (mProgram->getUniforms()[uniformIndex]->isArray())
                {
                    length += 3;  // Counting in "[0]".
                }
                maxLength = std::max(length, maxLength);
            }
        }
    }

    return maxLength;
}

GLint Program::getActiveUniformi(GLuint index, GLenum pname) const
{
    const gl::LinkedUniform& uniform = *mProgram->getUniforms()[index];
    switch (pname)
    {
      case GL_UNIFORM_TYPE:         return static_cast<GLint>(uniform.type);
      case GL_UNIFORM_SIZE:         return static_cast<GLint>(uniform.elementCount());
      case GL_UNIFORM_NAME_LENGTH:  return static_cast<GLint>(uniform.name.size() + 1 + (uniform.isArray() ? 3 : 0));
      case GL_UNIFORM_BLOCK_INDEX:  return uniform.blockIndex;
      case GL_UNIFORM_OFFSET:       return uniform.blockInfo.offset;
      case GL_UNIFORM_ARRAY_STRIDE: return uniform.blockInfo.arrayStride;
      case GL_UNIFORM_MATRIX_STRIDE: return uniform.blockInfo.matrixStride;
      case GL_UNIFORM_IS_ROW_MAJOR: return static_cast<GLint>(uniform.blockInfo.isRowMajorMatrix);
      default:
        UNREACHABLE();
        break;
    }
    return 0;
}

bool Program::isValidUniformLocation(GLint location) const
{
    const auto &uniformIndices = mProgram->getUniformIndices();
    ASSERT(rx::IsIntegerCastSafe<GLint>(uniformIndices.size()));
    return (location >= 0 && uniformIndices.find(location) != uniformIndices.end());
}

LinkedUniform *Program::getUniformByLocation(GLint location) const
{
    return mProgram->getUniformByLocation(location);
}

LinkedUniform *Program::getUniformByName(const std::string &name) const
{
    return mProgram->getUniformByName(name);
}

GLint Program::getUniformLocation(const std::string &name)
{
    return mProgram->getUniformLocation(name);
}

GLuint Program::getUniformIndex(const std::string &name)
{
    return mProgram->getUniformIndex(name);
}

void Program::setUniform1fv(GLint location, GLsizei count, const GLfloat *v)
{
    mProgram->setUniform1fv(location, count, v);
}

void Program::setUniform2fv(GLint location, GLsizei count, const GLfloat *v)
{
    mProgram->setUniform2fv(location, count, v);
}

void Program::setUniform3fv(GLint location, GLsizei count, const GLfloat *v)
{
    mProgram->setUniform3fv(location, count, v);
}

void Program::setUniform4fv(GLint location, GLsizei count, const GLfloat *v)
{
    mProgram->setUniform4fv(location, count, v);
}

void Program::setUniform1iv(GLint location, GLsizei count, const GLint *v)
{
    mProgram->setUniform1iv(location, count, v);
}

void Program::setUniform2iv(GLint location, GLsizei count, const GLint *v)
{
    mProgram->setUniform2iv(location, count, v);
}

void Program::setUniform3iv(GLint location, GLsizei count, const GLint *v)
{
    mProgram->setUniform3iv(location, count, v);
}

void Program::setUniform4iv(GLint location, GLsizei count, const GLint *v)
{
    mProgram->setUniform4iv(location, count, v);
}

void Program::setUniform1uiv(GLint location, GLsizei count, const GLuint *v)
{
    mProgram->setUniform1uiv(location, count, v);
}

void Program::setUniform2uiv(GLint location, GLsizei count, const GLuint *v)
{
    mProgram->setUniform2uiv(location, count, v);
}

void Program::setUniform3uiv(GLint location, GLsizei count, const GLuint *v)
{
    mProgram->setUniform3uiv(location, count, v);
}

void Program::setUniform4uiv(GLint location, GLsizei count, const GLuint *v)
{
    mProgram->setUniform4uiv(location, count, v);
}

void Program::setUniformMatrix2fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *v)
{
    mProgram->setUniformMatrix2fv(location, count, transpose, v);
}

void Program::setUniformMatrix3fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *v)
{
    mProgram->setUniformMatrix3fv(location, count, transpose, v);
}

void Program::setUniformMatrix4fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *v)
{
    mProgram->setUniformMatrix4fv(location, count, transpose, v);
}

void Program::setUniformMatrix2x3fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *v)
{
    mProgram->setUniformMatrix2x3fv(location, count, transpose, v);
}

void Program::setUniformMatrix2x4fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *v)
{
    mProgram->setUniformMatrix2x4fv(location, count, transpose, v);
}

void Program::setUniformMatrix3x2fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *v)
{
    mProgram->setUniformMatrix3x2fv(location, count, transpose, v);
}

void Program::setUniformMatrix3x4fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *v)
{
    mProgram->setUniformMatrix3x4fv(location, count, transpose, v);
}

void Program::setUniformMatrix4x2fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *v)
{
    mProgram->setUniformMatrix4x2fv(location, count, transpose, v);
}

void Program::setUniformMatrix4x3fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *v)
{
    mProgram->setUniformMatrix4x3fv(location, count, transpose, v);
}

void Program::getUniformfv(GLint location, GLfloat *v)
{
    mProgram->getUniformfv(location, v);
}

void Program::getUniformiv(GLint location, GLint *v)
{
    mProgram->getUniformiv(location, v);
}

void Program::getUniformuiv(GLint location, GLuint *v)
{
    mProgram->getUniformuiv(location, v);
}

// Applies all the uniforms set for this program object to the renderer
Error Program::applyUniforms()
{
    return mProgram->applyUniforms();
}

Error Program::applyUniformBuffers(const gl::Data &data)
{
    return mProgram->applyUniformBuffers(data, mUniformBlockBindings);
}

void Program::flagForDeletion()
{
    mDeleteStatus = true;
}

bool Program::isFlaggedForDeletion() const
{
    return mDeleteStatus;
}

void Program::validate(const Caps &caps)
{
    mInfoLog.reset();
    mValidated = false;

    if (mLinked)
    {
        applyUniforms();
        mValidated = mProgram->validateSamplers(&mInfoLog, caps);
    }
    else
    {
        mInfoLog << "Program has not been successfully linked.";
    }
}

bool Program::validateSamplers(InfoLog *infoLog, const Caps &caps)
{
    return mProgram->validateSamplers(infoLog, caps);
}

bool Program::isValidated() const
{
    return mValidated;
}

void Program::updateSamplerMapping()
{
    return mProgram->updateSamplerMapping();
}

GLuint Program::getActiveUniformBlockCount()
{
    return static_cast<GLuint>(mProgram->getUniformBlocks().size());
}

void Program::getActiveUniformBlockName(GLuint uniformBlockIndex, GLsizei bufSize, GLsizei *length, GLchar *uniformBlockName) const
{
    ASSERT(uniformBlockIndex < mProgram->getUniformBlocks().size());   // index must be smaller than getActiveUniformBlockCount()

    const UniformBlock &uniformBlock = *mProgram->getUniformBlocks()[uniformBlockIndex];

    if (bufSize > 0)
    {
        std::string string = uniformBlock.name;

        if (uniformBlock.isArrayElement())
        {
            string += ArrayString(uniformBlock.elementIndex);
        }

        strncpy(uniformBlockName, string.c_str(), bufSize);
        uniformBlockName[bufSize - 1] = '\0';

        if (length)
        {
            *length = static_cast<GLsizei>(strlen(uniformBlockName));
        }
    }
}

void Program::getActiveUniformBlockiv(GLuint uniformBlockIndex, GLenum pname, GLint *params) const
{
    ASSERT(uniformBlockIndex < mProgram->getUniformBlocks().size());   // index must be smaller than getActiveUniformBlockCount()

    const UniformBlock &uniformBlock = *mProgram->getUniformBlocks()[uniformBlockIndex];

    switch (pname)
    {
      case GL_UNIFORM_BLOCK_DATA_SIZE:
        *params = static_cast<GLint>(uniformBlock.dataSize);
        break;
      case GL_UNIFORM_BLOCK_NAME_LENGTH:
        *params = static_cast<GLint>(uniformBlock.name.size() + 1 + (uniformBlock.isArrayElement() ? 3 : 0));
        break;
      case GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS:
        *params = static_cast<GLint>(uniformBlock.memberUniformIndexes.size());
        break;
      case GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES:
        {
            for (unsigned int blockMemberIndex = 0; blockMemberIndex < uniformBlock.memberUniformIndexes.size(); blockMemberIndex++)
            {
                params[blockMemberIndex] = static_cast<GLint>(uniformBlock.memberUniformIndexes[blockMemberIndex]);
            }
        }
        break;
      case GL_UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER:
        *params = static_cast<GLint>(uniformBlock.isReferencedByVertexShader());
        break;
      case GL_UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER:
        *params = static_cast<GLint>(uniformBlock.isReferencedByFragmentShader());
        break;
      default: UNREACHABLE();
    }
}

GLint Program::getActiveUniformBlockMaxLength()
{
    int maxLength = 0;

    if (mLinked)
    {
        unsigned int numUniformBlocks =
            static_cast<unsigned int>(mProgram->getUniformBlocks().size());
        for (unsigned int uniformBlockIndex = 0; uniformBlockIndex < numUniformBlocks; uniformBlockIndex++)
        {
            const UniformBlock &uniformBlock = *mProgram->getUniformBlocks()[uniformBlockIndex];
            if (!uniformBlock.name.empty())
            {
                const int length = static_cast<int>(uniformBlock.name.length()) + 1;

                // Counting in "[0]".
                const int arrayLength = (uniformBlock.isArrayElement() ? 3 : 0);

                maxLength = std::max(length + arrayLength, maxLength);
            }
        }
    }

    return maxLength;
}

GLuint Program::getUniformBlockIndex(const std::string &name)
{
    return mProgram->getUniformBlockIndex(name);
}

const UniformBlock *Program::getUniformBlockByIndex(GLuint index) const
{
    return mProgram->getUniformBlockByIndex(index);
}

void Program::bindUniformBlock(GLuint uniformBlockIndex, GLuint uniformBlockBinding)
{
    mUniformBlockBindings[uniformBlockIndex] = uniformBlockBinding;
}

GLuint Program::getUniformBlockBinding(GLuint uniformBlockIndex) const
{
    return mUniformBlockBindings[uniformBlockIndex];
}

void Program::resetUniformBlockBindings()
{
    for (unsigned int blockId = 0; blockId < IMPLEMENTATION_MAX_COMBINED_SHADER_UNIFORM_BUFFERS; blockId++)
    {
        mUniformBlockBindings[blockId] = 0;
    }
}

void Program::setTransformFeedbackVaryings(GLsizei count, const GLchar *const *varyings, GLenum bufferMode)
{
    mData.mTransformFeedbackVaryingNames.resize(count);
    for (GLsizei i = 0; i < count; i++)
    {
        mData.mTransformFeedbackVaryingNames[i] = varyings[i];
    }

    mData.mTransformFeedbackBufferMode = bufferMode;
}

void Program::getTransformFeedbackVarying(GLuint index, GLsizei bufSize, GLsizei *length, GLsizei *size, GLenum *type, GLchar *name) const
{
    if (mLinked)
    {
        ASSERT(index < mData.mTransformFeedbackVaryingVars.size());
        const sh::Varying &varying = mData.mTransformFeedbackVaryingVars[index];
        GLsizei lastNameIdx = std::min(bufSize - 1, static_cast<GLsizei>(varying.name.length()));
        if (length)
        {
            *length = lastNameIdx;
        }
        if (size)
        {
            *size = varying.elementCount();
        }
        if (type)
        {
            *type = varying.type;
        }
        if (name)
        {
            memcpy(name, varying.name.c_str(), lastNameIdx);
            name[lastNameIdx] = '\0';
        }
    }
}

GLsizei Program::getTransformFeedbackVaryingCount() const
{
    if (mLinked)
    {
        return static_cast<GLsizei>(mData.mTransformFeedbackVaryingVars.size());
    }
    else
    {
        return 0;
    }
}

GLsizei Program::getTransformFeedbackVaryingMaxLength() const
{
    if (mLinked)
    {
        GLsizei maxSize = 0;
        for (const sh::Varying &varying : mData.mTransformFeedbackVaryingVars)
        {
            maxSize = std::max(maxSize, static_cast<GLsizei>(varying.name.length() + 1));
        }

        return maxSize;
    }
    else
    {
        return 0;
    }
}

GLenum Program::getTransformFeedbackBufferMode() const
{
    return mData.mTransformFeedbackBufferMode;
}

// static
bool Program::linkVaryings(InfoLog &infoLog,
                           const Shader *vertexShader,
                           const Shader *fragmentShader)
{
    const std::vector<PackedVarying> &vertexVaryings   = vertexShader->getVaryings();
    const std::vector<PackedVarying> &fragmentVaryings = fragmentShader->getVaryings();

    for (const PackedVarying &output : fragmentVaryings)
    {
        bool matched = false;

        // Built-in varyings obey special rules
        if (output.isBuiltIn())
        {
            continue;
        }

        for (const PackedVarying &input : vertexVaryings)
        {
            if (output.name == input.name)
            {
                ASSERT(!input.isBuiltIn());
                if (!linkValidateVaryings(infoLog, output.name, input, output))
                {
                    return false;
                }

                matched = true;
                break;
            }
        }

        // We permit unmatched, unreferenced varyings
        if (!matched && output.staticUse)
        {
            infoLog << "Fragment varying " << output.name << " does not match any vertex varying";
            return false;
        }
    }

    // TODO(jmadill): verify no unmatched vertex varyings?

    return true;
}

bool Program::linkUniforms(gl::InfoLog &infoLog, const gl::Caps & /*caps*/) const
{
    const std::vector<sh::Uniform> &vertexUniforms   = mData.mAttachedVertexShader->getUniforms();
    const std::vector<sh::Uniform> &fragmentUniforms = mData.mAttachedFragmentShader->getUniforms();

    // Check that uniforms defined in the vertex and fragment shaders are identical
    std::map<std::string, const sh::Uniform *> linkedUniforms;

    for (const sh::Uniform &vertexUniform : vertexUniforms)
    {
        linkedUniforms[vertexUniform.name] = &vertexUniform;
    }

    for (const sh::Uniform &fragmentUniform : fragmentUniforms)
    {
        auto entry = linkedUniforms.find(fragmentUniform.name);
        if (entry != linkedUniforms.end())
        {
            const sh::Uniform &vertexUniform = *entry->second;
            const std::string &uniformName = "uniform '" + vertexUniform.name + "'";
            if (!linkValidateUniforms(infoLog, uniformName, vertexUniform, fragmentUniform))
            {
                return false;
            }
        }
    }

    // TODO(jmadill): check sampler uniforms with caps
    return true;
}

bool Program::linkValidateInterfaceBlockFields(InfoLog &infoLog, const std::string &uniformName, const sh::InterfaceBlockField &vertexUniform, const sh::InterfaceBlockField &fragmentUniform)
{
    if (!linkValidateVariablesBase(infoLog, uniformName, vertexUniform, fragmentUniform, true))
    {
        return false;
    }

    if (vertexUniform.isRowMajorLayout != fragmentUniform.isRowMajorLayout)
    {
        infoLog << "Matrix packings for " << uniformName << " differ between vertex and fragment shaders";
        return false;
    }

    return true;
}

// Determines the mapping between GL attributes and Direct3D 9 vertex stream usage indices
bool Program::linkAttributes(const gl::Data &data,
                             InfoLog &infoLog,
                             const AttributeBindings &attributeBindings,
                             const Shader *vertexShader)
{
    unsigned int usedLocations = 0;
    const std::vector<sh::Attribute> &shaderAttributes = vertexShader->getActiveAttributes();
    GLuint maxAttribs = data.caps->maxVertexAttributes;

    // TODO(jmadill): handle aliasing robustly
    if (shaderAttributes.size() > maxAttribs)
    {
        infoLog << "Too many vertex attributes.";
        return false;
    }

    // Link attributes that have a binding location
    for (unsigned int attributeIndex = 0; attributeIndex < shaderAttributes.size(); attributeIndex++)
    {
        const sh::Attribute &attribute = shaderAttributes[attributeIndex];

        ASSERT(attribute.staticUse);

        const int location = attribute.location == -1 ? attributeBindings.getAttributeBinding(attribute.name) : attribute.location;

        mProgram->setShaderAttribute(attributeIndex, attribute);

        if (location != -1)   // Set by glBindAttribLocation or by location layout qualifier
        {
            const int rows = VariableRegisterCount(attribute.type);

            if (static_cast<GLuint>(rows + location) > maxAttribs)
            {
                infoLog << "Active attribute (" << attribute.name << ") at location "
                        << location << " is too big to fit";

                return false;
            }

            for (int row = 0; row < rows; row++)
            {
                const int rowLocation = location + row;
                sh::ShaderVariable *linkedAttribute = &mLinkedAttributes[rowLocation];

                // In GLSL 3.00, attribute aliasing produces a link error
                // In GLSL 1.00, attribute aliasing is allowed, but ANGLE currently has a bug
                // TODO(jmadill): fix aliasing on ES2
                // if (mProgram->getShaderVersion() >= 300)
                {
                    if (!linkedAttribute->name.empty())
                    {
                        infoLog << "Attribute '" << attribute.name << "' aliases attribute '"
                                << linkedAttribute->name << "' at location " << rowLocation;
                        return false;
                    }
                }

                *linkedAttribute = attribute;
                usedLocations |= 1 << rowLocation;
            }
        }
    }

    // Link attributes that don't have a binding location
    for (unsigned int attributeIndex = 0; attributeIndex < shaderAttributes.size(); attributeIndex++)
    {
        const sh::Attribute &attribute = shaderAttributes[attributeIndex];

        ASSERT(attribute.staticUse);

        const int location = attribute.location == -1 ? attributeBindings.getAttributeBinding(attribute.name) : attribute.location;

        if (location == -1)   // Not set by glBindAttribLocation or by location layout qualifier
        {
            int rows = VariableRegisterCount(attribute.type);
            int availableIndex = AllocateFirstFreeBits(&usedLocations, rows, maxAttribs);

            if (availableIndex == -1 || static_cast<GLuint>(availableIndex + rows) > maxAttribs)
            {
                infoLog << "Too many active attributes (" << attribute.name << ")";
                return false;   // Fail to link
            }

            mLinkedAttributes[availableIndex] = attribute;
        }
    }

    for (GLuint attributeIndex = 0; attributeIndex < maxAttribs;)
    {
        int index = vertexShader->getSemanticIndex(mLinkedAttributes[attributeIndex].name);
        int rows  = VariableRegisterCount(mLinkedAttributes[attributeIndex].type);

        for (int r = 0; r < rows; r++)
        {
            mProgram->getSemanticIndexes()[attributeIndex++] = index++;
        }
    }

    return true;
}

bool Program::linkUniformBlocks(InfoLog &infoLog, const Caps &caps)
{
    const Shader &vertexShader   = *mData.mAttachedVertexShader;
    const Shader &fragmentShader = *mData.mAttachedFragmentShader;

    const std::vector<sh::InterfaceBlock> &vertexInterfaceBlocks = vertexShader.getInterfaceBlocks();
    const std::vector<sh::InterfaceBlock> &fragmentInterfaceBlocks = fragmentShader.getInterfaceBlocks();

    // Check that interface blocks defined in the vertex and fragment shaders are identical
    typedef std::map<std::string, const sh::InterfaceBlock*> UniformBlockMap;
    UniformBlockMap linkedUniformBlocks;

    GLuint vertexBlockCount = 0;
    for (const sh::InterfaceBlock &vertexInterfaceBlock : vertexInterfaceBlocks)
    {
        linkedUniformBlocks[vertexInterfaceBlock.name] = &vertexInterfaceBlock;

        // Note: shared and std140 layouts are always considered active
        if (vertexInterfaceBlock.staticUse || vertexInterfaceBlock.layout != sh::BLOCKLAYOUT_PACKED)
        {
            if (++vertexBlockCount > caps.maxVertexUniformBlocks)
            {
                infoLog << "Vertex shader uniform block count exceed GL_MAX_VERTEX_UNIFORM_BLOCKS ("
                        << caps.maxVertexUniformBlocks << ")";
                return false;
            }
        }
    }

    GLuint fragmentBlockCount = 0;
    for (const sh::InterfaceBlock &fragmentInterfaceBlock : fragmentInterfaceBlocks)
    {
        auto entry = linkedUniformBlocks.find(fragmentInterfaceBlock.name);
        if (entry != linkedUniformBlocks.end())
        {
            const sh::InterfaceBlock &vertexInterfaceBlock = *entry->second;
            if (!areMatchingInterfaceBlocks(infoLog, vertexInterfaceBlock, fragmentInterfaceBlock))
            {
                return false;
            }
        }

        // Note: shared and std140 layouts are always considered active
        if (fragmentInterfaceBlock.staticUse ||
            fragmentInterfaceBlock.layout != sh::BLOCKLAYOUT_PACKED)
        {
            if (++fragmentBlockCount > caps.maxFragmentUniformBlocks)
            {
                infoLog
                    << "Fragment shader uniform block count exceed GL_MAX_FRAGMENT_UNIFORM_BLOCKS ("
                    << caps.maxFragmentUniformBlocks << ")";
                return false;
            }
        }
    }

    return true;
}

bool Program::areMatchingInterfaceBlocks(gl::InfoLog &infoLog, const sh::InterfaceBlock &vertexInterfaceBlock,
                                         const sh::InterfaceBlock &fragmentInterfaceBlock)
{
    const char* blockName = vertexInterfaceBlock.name.c_str();
    // validate blocks for the same member types
    if (vertexInterfaceBlock.fields.size() != fragmentInterfaceBlock.fields.size())
    {
        infoLog << "Types for interface block '" << blockName
                << "' differ between vertex and fragment shaders";
        return false;
    }
    if (vertexInterfaceBlock.arraySize != fragmentInterfaceBlock.arraySize)
    {
        infoLog << "Array sizes differ for interface block '" << blockName
                << "' between vertex and fragment shaders";
        return false;
    }
    if (vertexInterfaceBlock.layout != fragmentInterfaceBlock.layout || vertexInterfaceBlock.isRowMajorLayout != fragmentInterfaceBlock.isRowMajorLayout)
    {
        infoLog << "Layout qualifiers differ for interface block '" << blockName
                << "' between vertex and fragment shaders";
        return false;
    }
    const unsigned int numBlockMembers =
        static_cast<unsigned int>(vertexInterfaceBlock.fields.size());
    for (unsigned int blockMemberIndex = 0; blockMemberIndex < numBlockMembers; blockMemberIndex++)
    {
        const sh::InterfaceBlockField &vertexMember = vertexInterfaceBlock.fields[blockMemberIndex];
        const sh::InterfaceBlockField &fragmentMember = fragmentInterfaceBlock.fields[blockMemberIndex];
        if (vertexMember.name != fragmentMember.name)
        {
            infoLog << "Name mismatch for field " << blockMemberIndex
                    << " of interface block '" << blockName
                    << "': (in vertex: '" << vertexMember.name
                    << "', in fragment: '" << fragmentMember.name << "')";
            return false;
        }
        std::string memberName = "interface block '" + vertexInterfaceBlock.name + "' member '" + vertexMember.name + "'";
        if (!linkValidateInterfaceBlockFields(infoLog, memberName, vertexMember, fragmentMember))
        {
            return false;
        }
    }
    return true;
}

bool Program::linkValidateVariablesBase(InfoLog &infoLog, const std::string &variableName, const sh::ShaderVariable &vertexVariable,
                                              const sh::ShaderVariable &fragmentVariable, bool validatePrecision)
{
    if (vertexVariable.type != fragmentVariable.type)
    {
        infoLog << "Types for " << variableName << " differ between vertex and fragment shaders";
        return false;
    }
    if (vertexVariable.arraySize != fragmentVariable.arraySize)
    {
        infoLog << "Array sizes for " << variableName << " differ between vertex and fragment shaders";
        return false;
    }
    if (validatePrecision && vertexVariable.precision != fragmentVariable.precision)
    {
        infoLog << "Precisions for " << variableName << " differ between vertex and fragment shaders";
        return false;
    }

    if (vertexVariable.fields.size() != fragmentVariable.fields.size())
    {
        infoLog << "Structure lengths for " << variableName << " differ between vertex and fragment shaders";
        return false;
    }
    const unsigned int numMembers = static_cast<unsigned int>(vertexVariable.fields.size());
    for (unsigned int memberIndex = 0; memberIndex < numMembers; memberIndex++)
    {
        const sh::ShaderVariable &vertexMember = vertexVariable.fields[memberIndex];
        const sh::ShaderVariable &fragmentMember = fragmentVariable.fields[memberIndex];

        if (vertexMember.name != fragmentMember.name)
        {
            infoLog << "Name mismatch for field '" << memberIndex
                    << "' of " << variableName
                    << ": (in vertex: '" << vertexMember.name
                    << "', in fragment: '" << fragmentMember.name << "')";
            return false;
        }

        const std::string memberName = variableName.substr(0, variableName.length() - 1) + "." +
                                       vertexMember.name + "'";

        if (!linkValidateVariablesBase(infoLog, vertexMember.name, vertexMember, fragmentMember, validatePrecision))
        {
            return false;
        }
    }

    return true;
}

bool Program::linkValidateUniforms(InfoLog &infoLog, const std::string &uniformName, const sh::Uniform &vertexUniform, const sh::Uniform &fragmentUniform)
{
#if ANGLE_PROGRAM_LINK_VALIDATE_UNIFORM_PRECISION == ANGLE_ENABLED
    const bool validatePrecision = true;
#else
    const bool validatePrecision = false;
#endif

    if (!linkValidateVariablesBase(infoLog, uniformName, vertexUniform, fragmentUniform, validatePrecision))
    {
        return false;
    }

    return true;
}

bool Program::linkValidateVaryings(InfoLog &infoLog, const std::string &varyingName, const sh::Varying &vertexVarying, const sh::Varying &fragmentVarying)
{
    if (!linkValidateVariablesBase(infoLog, varyingName, vertexVarying, fragmentVarying, false))
    {
        return false;
    }

    if (!sh::InterpolationTypesMatch(vertexVarying.interpolation, fragmentVarying.interpolation))
    {
        infoLog << "Interpolation types for " << varyingName << " differ between vertex and fragment shaders";
        return false;
    }

    return true;
}

bool Program::linkValidateTransformFeedback(InfoLog &infoLog,
                                            const std::vector<const sh::Varying *> &varyings,
                                            const Caps &caps) const
{
    size_t totalComponents = 0;

    std::set<std::string> uniqueNames;

    for (const std::string &tfVaryingName : mData.mTransformFeedbackVaryingNames)
    {
        bool found = false;
        for (const sh::Varying *varying : varyings)
        {
            if (tfVaryingName == varying->name)
            {
                if (uniqueNames.count(tfVaryingName) > 0)
                {
                    infoLog << "Two transform feedback varyings specify the same output variable ("
                            << tfVaryingName << ").";
                    return false;
                }
                uniqueNames.insert(tfVaryingName);

                // TODO(jmadill): Investigate implementation limits on D3D11
                size_t componentCount = gl::VariableComponentCount(varying->type);
                if (mData.mTransformFeedbackBufferMode == GL_SEPARATE_ATTRIBS &&
                    componentCount > caps.maxTransformFeedbackSeparateComponents)
                {
                    infoLog << "Transform feedback varying's " << varying->name << " components ("
                            << componentCount << ") exceed the maximum separate components ("
                            << caps.maxTransformFeedbackSeparateComponents << ").";
                    return false;
                }

                totalComponents += componentCount;
                found = true;
                break;
            }
        }

        // All transform feedback varyings are expected to exist since packVaryings checks for them.
        ASSERT(found);
        UNUSED_ASSERTION_VARIABLE(found);
    }

    if (mData.mTransformFeedbackBufferMode == GL_INTERLEAVED_ATTRIBS &&
        totalComponents > caps.maxTransformFeedbackInterleavedComponents)
    {
        infoLog << "Transform feedback varying total components (" << totalComponents
                << ") exceed the maximum interleaved components ("
                << caps.maxTransformFeedbackInterleavedComponents << ").";
        return false;
    }

    return true;
}

void Program::gatherTransformFeedbackVaryings(const std::vector<const sh::Varying *> &varyings)
{
    // Gather the linked varyings that are used for transform feedback, they should all exist.
    mData.mTransformFeedbackVaryingVars.clear();
    for (const std::string &tfVaryingName : mData.mTransformFeedbackVaryingNames)
    {
        for (const sh::Varying *varying : varyings)
        {
            if (tfVaryingName == varying->name)
            {
                mData.mTransformFeedbackVaryingVars.push_back(*varying);
                break;
            }
        }
    }
}

std::vector<const sh::Varying *> Program::getMergedVaryings() const
{
    std::set<std::string> uniqueNames;
    std::vector<const sh::Varying *> varyings;

    for (const sh::Varying &varying : mData.mAttachedVertexShader->getVaryings())
    {
        if (uniqueNames.count(varying.name) == 0)
        {
            uniqueNames.insert(varying.name);
            varyings.push_back(&varying);
        }
    }

    for (const sh::Varying &varying : mData.mAttachedFragmentShader->getVaryings())
    {
        if (uniqueNames.count(varying.name) == 0)
        {
            uniqueNames.insert(varying.name);
            varyings.push_back(&varying);
        }
    }

    return varyings;
}
}
kc3-lang/angle/src/libANGLE/Program.cpp

Commit

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