src/libANGLE/State.cpp

//
// Copyright (c) 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.
//

// State.cpp: Implements the State class, encapsulating raw GL state.

#include "libANGLE/State.h"

#include <string.h>
#include <limits>

#include "common/bitset_utils.h"
#include "common/mathutil.h"
#include "common/matrix_utils.h"
#include "libANGLE/Caps.h"
#include "libANGLE/Context.h"
#include "libANGLE/Debug.h"
#include "libANGLE/Framebuffer.h"
#include "libANGLE/FramebufferAttachment.h"
#include "libANGLE/Query.h"
#include "libANGLE/VertexArray.h"
#include "libANGLE/formatutils.h"
#include "libANGLE/queryconversions.h"
#include "libANGLE/queryutils.h"
#include "libANGLE/renderer/ContextImpl.h"

namespace gl
{

namespace
{

bool GetAlternativeQueryType(QueryType type, QueryType *alternativeType)
{
    switch (type)
    {
        case QueryType::AnySamples:
            *alternativeType = QueryType::AnySamplesConservative;
            return true;
        case QueryType::AnySamplesConservative:
            *alternativeType = QueryType::AnySamples;
            return true;
        default:
            return false;
    }
}

}  // anonymous namepace

template <typename BindingT, typename... ArgsT>
void UpdateNonTFBufferBinding(const Context *context, BindingT *binding, ArgsT... args)
{
    if (binding->get())
        (*binding)->onNonTFBindingChanged(context, -1);
    binding->set(context, args...);
    if (binding->get())
        (*binding)->onNonTFBindingChanged(context, 1);
}

template <typename BindingT, typename... ArgsT>
void UpdateTFBufferBinding(const Context *context, BindingT *binding, bool indexed, ArgsT... args)
{
    if (binding->get())
        (*binding)->onTFBindingChanged(context, false, indexed);
    binding->set(context, args...);
    if (binding->get())
        (*binding)->onTFBindingChanged(context, true, indexed);
}

void UpdateBufferBinding(const Context *context,
                         BindingPointer<Buffer> *binding,
                         Buffer *buffer,
                         BufferBinding target)
{
    if (target == BufferBinding::TransformFeedback)
    {
        UpdateTFBufferBinding(context, binding, false, buffer);
    }
    else
    {
        UpdateNonTFBufferBinding(context, binding, buffer);
    }
}

void UpdateIndexedBufferBinding(const Context *context,
                                OffsetBindingPointer<Buffer> *binding,
                                Buffer *buffer,
                                BufferBinding target,
                                GLintptr offset,
                                GLsizeiptr size)
{
    if (target == BufferBinding::TransformFeedback)
    {
        UpdateTFBufferBinding(context, binding, true, buffer, offset, size);
    }
    else
    {
        UpdateNonTFBufferBinding(context, binding, buffer, offset, size);
    }
}

State::State(bool debug,
             bool bindGeneratesResource,
             bool clientArraysEnabled,
             bool robustResourceInit,
             bool programBinaryCacheEnabled)
    : mMaxDrawBuffers(0),
      mMaxCombinedTextureImageUnits(0),
      mDepthClearValue(0),
      mStencilClearValue(0),
      mScissorTest(false),
      mSampleCoverage(false),
      mSampleCoverageValue(0),
      mSampleCoverageInvert(false),
      mSampleMask(false),
      mMaxSampleMaskWords(0),
      mStencilRef(0),
      mStencilBackRef(0),
      mLineWidth(0),
      mGenerateMipmapHint(GL_NONE),
      mFragmentShaderDerivativeHint(GL_NONE),
      mBindGeneratesResource(bindGeneratesResource),
      mClientArraysEnabled(clientArraysEnabled),
      mNearZ(0),
      mFarZ(0),
      mReadFramebuffer(nullptr),
      mDrawFramebuffer(nullptr),
      mProgram(nullptr),
      mVertexArray(nullptr),
      mActiveSampler(0),
      mActiveTexturesCache{},
      mCachedTexturesInitState(InitState::MayNeedInit),
      mCachedImageTexturesInitState(InitState::MayNeedInit),
      mPrimitiveRestart(false),
      mDebug(debug),
      mMultiSampling(false),
      mSampleAlphaToOne(false),
      mFramebufferSRGB(true),
      mRobustResourceInit(robustResourceInit),
      mProgramBinaryCacheEnabled(programBinaryCacheEnabled),
      mMaxShaderCompilerThreads(std::numeric_limits<GLuint>::max())
{
}

State::~State()
{
}

void State::initialize(Context *context)
{
    const Caps &caps                   = context->getCaps();
    const Extensions &extensions       = context->getExtensions();
    const Extensions &nativeExtensions = context->getImplementation()->getNativeExtensions();
    const Version &clientVersion       = context->getClientVersion();

    mMaxDrawBuffers               = caps.maxDrawBuffers;
    mMaxCombinedTextureImageUnits = caps.maxCombinedTextureImageUnits;

    setColorClearValue(0.0f, 0.0f, 0.0f, 0.0f);

    mDepthClearValue   = 1.0f;
    mStencilClearValue = 0;

    mScissorTest    = false;
    mScissor.x      = 0;
    mScissor.y      = 0;
    mScissor.width  = 0;
    mScissor.height = 0;

    mBlendColor.red   = 0;
    mBlendColor.green = 0;
    mBlendColor.blue  = 0;
    mBlendColor.alpha = 0;

    mStencilRef     = 0;
    mStencilBackRef = 0;

    mSampleCoverage       = false;
    mSampleCoverageValue  = 1.0f;
    mSampleCoverageInvert = false;

    mMaxSampleMaskWords = caps.maxSampleMaskWords;
    mSampleMask         = false;
    mSampleMaskValues.fill(~GLbitfield(0));

    mGenerateMipmapHint           = GL_DONT_CARE;
    mFragmentShaderDerivativeHint = GL_DONT_CARE;

    mLineWidth = 1.0f;

    mViewport.x      = 0;
    mViewport.y      = 0;
    mViewport.width  = 0;
    mViewport.height = 0;
    mNearZ           = 0.0f;
    mFarZ            = 1.0f;

    mBlend.colorMaskRed   = true;
    mBlend.colorMaskGreen = true;
    mBlend.colorMaskBlue  = true;
    mBlend.colorMaskAlpha = true;

    mActiveSampler = 0;

    mVertexAttribCurrentValues.resize(caps.maxVertexAttributes);

    // Set all indexes in state attributes type mask to float (default)
    for (int i = 0; i < MAX_VERTEX_ATTRIBS; i++)
    {
        mCurrentValuesTypeMask.setIndex(GL_FLOAT, i);
    }

    mUniformBuffers.resize(caps.maxUniformBufferBindings);

    mSamplerTextures[TextureType::_2D].resize(caps.maxCombinedTextureImageUnits);
    mSamplerTextures[TextureType::CubeMap].resize(caps.maxCombinedTextureImageUnits);
    if (clientVersion >= Version(3, 0))
    {
        // TODO: These could also be enabled via extension
        mSamplerTextures[TextureType::_2DArray].resize(caps.maxCombinedTextureImageUnits);
        mSamplerTextures[TextureType::_3D].resize(caps.maxCombinedTextureImageUnits);
    }
    if (clientVersion >= Version(3, 1))
    {
        // TODO(http://anglebug.com/2775): These could also be enabled via extension
        mSamplerTextures[TextureType::_2DMultisample].resize(caps.maxCombinedTextureImageUnits);
        mSamplerTextures[TextureType::_2DMultisampleArray].resize(
            caps.maxCombinedTextureImageUnits);

        mAtomicCounterBuffers.resize(caps.maxAtomicCounterBufferBindings);
        mShaderStorageBuffers.resize(caps.maxShaderStorageBufferBindings);
        mImageUnits.resize(caps.maxImageUnits);
    }
    if (nativeExtensions.textureRectangle)
    {
        mSamplerTextures[TextureType::Rectangle].resize(caps.maxCombinedTextureImageUnits);
    }
    if (nativeExtensions.eglImageExternal || nativeExtensions.eglStreamConsumerExternal)
    {
        mSamplerTextures[TextureType::External].resize(caps.maxCombinedTextureImageUnits);
    }
    mCompleteTextureBindings.reserve(caps.maxCombinedTextureImageUnits);
    mCachedTexturesInitState = InitState::MayNeedInit;
    mCachedImageTexturesInitState = InitState::MayNeedInit;
    for (uint32_t textureIndex = 0; textureIndex < caps.maxCombinedTextureImageUnits;
         ++textureIndex)
    {
        mCompleteTextureBindings.emplace_back(context, textureIndex);
    }

    mSamplers.resize(caps.maxCombinedTextureImageUnits);

    for (QueryType type : angle::AllEnums<QueryType>())
    {
        mActiveQueries[type].set(context, nullptr);
    }

    mProgram = nullptr;

    mReadFramebuffer = nullptr;
    mDrawFramebuffer = nullptr;

    mPrimitiveRestart = false;

    mDebug.setMaxLoggedMessages(extensions.maxDebugLoggedMessages);

    mMultiSampling    = true;
    mSampleAlphaToOne = false;

    mCoverageModulation = GL_NONE;

    angle::Matrix<GLfloat>::setToIdentity(mPathMatrixProj);
    angle::Matrix<GLfloat>::setToIdentity(mPathMatrixMV);
    mPathStencilFunc = GL_ALWAYS;
    mPathStencilRef  = 0;
    mPathStencilMask = std::numeric_limits<GLuint>::max();

    // GLES1 emulation: Initialize state for GLES1 if version
    // applies
    if (clientVersion < Version(2, 0))
    {
        mGLES1State.initialize(context, this);
    }
}

void State::reset(const Context *context)
{
    for (auto &bindingVec : mSamplerTextures)
    {
        for (size_t textureIdx = 0; textureIdx < bindingVec.size(); textureIdx++)
        {
            bindingVec[textureIdx].set(context, nullptr);
        }
    }
    for (size_t samplerIdx = 0; samplerIdx < mSamplers.size(); samplerIdx++)
    {
        mSamplers[samplerIdx].set(context, nullptr);
    }

    for (auto &imageUnit : mImageUnits)
    {
        imageUnit.texture.set(context, nullptr);
        imageUnit.level   = 0;
        imageUnit.layered = false;
        imageUnit.layer   = 0;
        imageUnit.access  = GL_READ_ONLY;
        imageUnit.format  = GL_R32UI;
    }

    mRenderbuffer.set(context, nullptr);

    for (auto type : angle::AllEnums<BufferBinding>())
    {
        UpdateBufferBinding(context, &mBoundBuffers[type], nullptr, type);
    }

    if (mProgram)
    {
        mProgram->release(context);
    }
    mProgram = nullptr;

    mProgramPipeline.set(context, nullptr);

    if (mTransformFeedback.get())
        mTransformFeedback->onBindingChanged(context, false);
    mTransformFeedback.set(context, nullptr);

    for (QueryType type : angle::AllEnums<QueryType>())
    {
        mActiveQueries[type].set(context, nullptr);
    }

    for (auto &buf : mUniformBuffers)
    {
        UpdateIndexedBufferBinding(context, &buf, nullptr, BufferBinding::Uniform, 0, 0);
    }

    for (auto &buf : mAtomicCounterBuffers)
    {
        UpdateIndexedBufferBinding(context, &buf, nullptr, BufferBinding::AtomicCounter, 0, 0);
    }

    for (auto &buf : mShaderStorageBuffers)
    {
        UpdateIndexedBufferBinding(context, &buf, nullptr, BufferBinding::ShaderStorage, 0, 0);
    }

    angle::Matrix<GLfloat>::setToIdentity(mPathMatrixProj);
    angle::Matrix<GLfloat>::setToIdentity(mPathMatrixMV);
    mPathStencilFunc = GL_ALWAYS;
    mPathStencilRef  = 0;
    mPathStencilMask = std::numeric_limits<GLuint>::max();

    // TODO(jmadill): Is this necessary?
    setAllDirtyBits();
}

const RasterizerState &State::getRasterizerState() const
{
    return mRasterizer;
}

const BlendState &State::getBlendState() const
{
    return mBlend;
}

const DepthStencilState &State::getDepthStencilState() const
{
    return mDepthStencil;
}

void State::setColorClearValue(float red, float green, float blue, float alpha)
{
    mColorClearValue.red   = red;
    mColorClearValue.green = green;
    mColorClearValue.blue  = blue;
    mColorClearValue.alpha = alpha;
    mDirtyBits.set(DIRTY_BIT_CLEAR_COLOR);
}

void State::setDepthClearValue(float depth)
{
    mDepthClearValue = depth;
    mDirtyBits.set(DIRTY_BIT_CLEAR_DEPTH);
}

void State::setStencilClearValue(int stencil)
{
    mStencilClearValue = stencil;
    mDirtyBits.set(DIRTY_BIT_CLEAR_STENCIL);
}

void State::setColorMask(bool red, bool green, bool blue, bool alpha)
{
    mBlend.colorMaskRed   = red;
    mBlend.colorMaskGreen = green;
    mBlend.colorMaskBlue  = blue;
    mBlend.colorMaskAlpha = alpha;
    mDirtyBits.set(DIRTY_BIT_COLOR_MASK);
}

void State::setDepthMask(bool mask)
{
    mDepthStencil.depthMask = mask;
    mDirtyBits.set(DIRTY_BIT_DEPTH_MASK);
}

bool State::isRasterizerDiscardEnabled() const
{
    return mRasterizer.rasterizerDiscard;
}

void State::setRasterizerDiscard(bool enabled)
{
    mRasterizer.rasterizerDiscard = enabled;
    mDirtyBits.set(DIRTY_BIT_RASTERIZER_DISCARD_ENABLED);
}

bool State::isCullFaceEnabled() const
{
    return mRasterizer.cullFace;
}

void State::setCullFace(bool enabled)
{
    mRasterizer.cullFace = enabled;
    mDirtyBits.set(DIRTY_BIT_CULL_FACE_ENABLED);
}

void State::setCullMode(CullFaceMode mode)
{
    mRasterizer.cullMode = mode;
    mDirtyBits.set(DIRTY_BIT_CULL_FACE);
}

void State::setFrontFace(GLenum front)
{
    mRasterizer.frontFace = front;
    mDirtyBits.set(DIRTY_BIT_FRONT_FACE);
}

bool State::isDepthTestEnabled() const
{
    return mDepthStencil.depthTest;
}

void State::setDepthTest(bool enabled)
{
    mDepthStencil.depthTest = enabled;
    mDirtyBits.set(DIRTY_BIT_DEPTH_TEST_ENABLED);
}

void State::setDepthFunc(GLenum depthFunc)
{
    mDepthStencil.depthFunc = depthFunc;
    mDirtyBits.set(DIRTY_BIT_DEPTH_FUNC);
}

void State::setDepthRange(float zNear, float zFar)
{
    mNearZ = zNear;
    mFarZ  = zFar;
    mDirtyBits.set(DIRTY_BIT_DEPTH_RANGE);
}

float State::getNearPlane() const
{
    return mNearZ;
}

float State::getFarPlane() const
{
    return mFarZ;
}

bool State::isBlendEnabled() const
{
    return mBlend.blend;
}

void State::setBlend(bool enabled)
{
    mBlend.blend = enabled;
    mDirtyBits.set(DIRTY_BIT_BLEND_ENABLED);
}

void State::setBlendFactors(GLenum sourceRGB, GLenum destRGB, GLenum sourceAlpha, GLenum destAlpha)
{
    mBlend.sourceBlendRGB   = sourceRGB;
    mBlend.destBlendRGB     = destRGB;
    mBlend.sourceBlendAlpha = sourceAlpha;
    mBlend.destBlendAlpha   = destAlpha;
    mDirtyBits.set(DIRTY_BIT_BLEND_FUNCS);
}

void State::setBlendColor(float red, float green, float blue, float alpha)
{
    mBlendColor.red   = red;
    mBlendColor.green = green;
    mBlendColor.blue  = blue;
    mBlendColor.alpha = alpha;
    mDirtyBits.set(DIRTY_BIT_BLEND_COLOR);
}

void State::setBlendEquation(GLenum rgbEquation, GLenum alphaEquation)
{
    mBlend.blendEquationRGB   = rgbEquation;
    mBlend.blendEquationAlpha = alphaEquation;
    mDirtyBits.set(DIRTY_BIT_BLEND_EQUATIONS);
}

const ColorF &State::getBlendColor() const
{
    return mBlendColor;
}

bool State::isStencilTestEnabled() const
{
    return mDepthStencil.stencilTest;
}

void State::setStencilTest(bool enabled)
{
    mDepthStencil.stencilTest = enabled;
    mDirtyBits.set(DIRTY_BIT_STENCIL_TEST_ENABLED);
}

void State::setStencilParams(GLenum stencilFunc, GLint stencilRef, GLuint stencilMask)
{
    mDepthStencil.stencilFunc = stencilFunc;
    mStencilRef               = (stencilRef > 0) ? stencilRef : 0;
    mDepthStencil.stencilMask = stencilMask;
    mDirtyBits.set(DIRTY_BIT_STENCIL_FUNCS_FRONT);
}

void State::setStencilBackParams(GLenum stencilBackFunc,
                                 GLint stencilBackRef,
                                 GLuint stencilBackMask)
{
    mDepthStencil.stencilBackFunc = stencilBackFunc;
    mStencilBackRef               = (stencilBackRef > 0) ? stencilBackRef : 0;
    mDepthStencil.stencilBackMask = stencilBackMask;
    mDirtyBits.set(DIRTY_BIT_STENCIL_FUNCS_BACK);
}

void State::setStencilWritemask(GLuint stencilWritemask)
{
    mDepthStencil.stencilWritemask = stencilWritemask;
    mDirtyBits.set(DIRTY_BIT_STENCIL_WRITEMASK_FRONT);
}

void State::setStencilBackWritemask(GLuint stencilBackWritemask)
{
    mDepthStencil.stencilBackWritemask = stencilBackWritemask;
    mDirtyBits.set(DIRTY_BIT_STENCIL_WRITEMASK_BACK);
}

void State::setStencilOperations(GLenum stencilFail,
                                 GLenum stencilPassDepthFail,
                                 GLenum stencilPassDepthPass)
{
    mDepthStencil.stencilFail          = stencilFail;
    mDepthStencil.stencilPassDepthFail = stencilPassDepthFail;
    mDepthStencil.stencilPassDepthPass = stencilPassDepthPass;
    mDirtyBits.set(DIRTY_BIT_STENCIL_OPS_FRONT);
}

void State::setStencilBackOperations(GLenum stencilBackFail,
                                     GLenum stencilBackPassDepthFail,
                                     GLenum stencilBackPassDepthPass)
{
    mDepthStencil.stencilBackFail          = stencilBackFail;
    mDepthStencil.stencilBackPassDepthFail = stencilBackPassDepthFail;
    mDepthStencil.stencilBackPassDepthPass = stencilBackPassDepthPass;
    mDirtyBits.set(DIRTY_BIT_STENCIL_OPS_BACK);
}

GLint State::getStencilRef() const
{
    return mStencilRef;
}

GLint State::getStencilBackRef() const
{
    return mStencilBackRef;
}

bool State::isPolygonOffsetFillEnabled() const
{
    return mRasterizer.polygonOffsetFill;
}

void State::setPolygonOffsetFill(bool enabled)
{
    mRasterizer.polygonOffsetFill = enabled;
    mDirtyBits.set(DIRTY_BIT_POLYGON_OFFSET_FILL_ENABLED);
}

void State::setPolygonOffsetParams(GLfloat factor, GLfloat units)
{
    // An application can pass NaN values here, so handle this gracefully
    mRasterizer.polygonOffsetFactor = factor != factor ? 0.0f : factor;
    mRasterizer.polygonOffsetUnits  = units != units ? 0.0f : units;
    mDirtyBits.set(DIRTY_BIT_POLYGON_OFFSET);
}

bool State::isSampleAlphaToCoverageEnabled() const
{
    return mBlend.sampleAlphaToCoverage;
}

void State::setSampleAlphaToCoverage(bool enabled)
{
    mBlend.sampleAlphaToCoverage = enabled;
    mDirtyBits.set(DIRTY_BIT_SAMPLE_ALPHA_TO_COVERAGE_ENABLED);
}

bool State::isSampleCoverageEnabled() const
{
    return mSampleCoverage;
}

void State::setSampleCoverage(bool enabled)
{
    mSampleCoverage = enabled;
    mDirtyBits.set(DIRTY_BIT_SAMPLE_COVERAGE_ENABLED);
}

void State::setSampleCoverageParams(GLclampf value, bool invert)
{
    mSampleCoverageValue  = value;
    mSampleCoverageInvert = invert;
    mDirtyBits.set(DIRTY_BIT_SAMPLE_COVERAGE);
}

GLclampf State::getSampleCoverageValue() const
{
    return mSampleCoverageValue;
}

bool State::getSampleCoverageInvert() const
{
    return mSampleCoverageInvert;
}

bool State::isSampleMaskEnabled() const
{
    return mSampleMask;
}

void State::setSampleMaskEnabled(bool enabled)
{
    mSampleMask = enabled;
    mDirtyBits.set(DIRTY_BIT_SAMPLE_MASK_ENABLED);
}

void State::setSampleMaskParams(GLuint maskNumber, GLbitfield mask)
{
    ASSERT(maskNumber < mMaxSampleMaskWords);
    mSampleMaskValues[maskNumber] = mask;
    // TODO(jmadill): Use a child dirty bit if we ever use more than two words.
    mDirtyBits.set(DIRTY_BIT_SAMPLE_MASK);
}

GLbitfield State::getSampleMaskWord(GLuint maskNumber) const
{
    ASSERT(maskNumber < mMaxSampleMaskWords);
    return mSampleMaskValues[maskNumber];
}

GLuint State::getMaxSampleMaskWords() const
{
    return mMaxSampleMaskWords;
}

void State::setSampleAlphaToOne(bool enabled)
{
    mSampleAlphaToOne = enabled;
    mDirtyBits.set(DIRTY_BIT_SAMPLE_ALPHA_TO_ONE);
}

bool State::isSampleAlphaToOneEnabled() const
{
    return mSampleAlphaToOne;
}

void State::setMultisampling(bool enabled)
{
    mMultiSampling = enabled;
    mDirtyBits.set(DIRTY_BIT_MULTISAMPLING);
}

bool State::isMultisamplingEnabled() const
{
    return mMultiSampling;
}

bool State::isScissorTestEnabled() const
{
    return mScissorTest;
}

void State::setScissorTest(bool enabled)
{
    mScissorTest = enabled;
    mDirtyBits.set(DIRTY_BIT_SCISSOR_TEST_ENABLED);
}

void State::setScissorParams(GLint x, GLint y, GLsizei width, GLsizei height)
{
    mScissor.x      = x;
    mScissor.y      = y;
    mScissor.width  = width;
    mScissor.height = height;
    mDirtyBits.set(DIRTY_BIT_SCISSOR);
}

const Rectangle &State::getScissor() const
{
    return mScissor;
}

bool State::isDitherEnabled() const
{
    return mBlend.dither;
}

void State::setDither(bool enabled)
{
    mBlend.dither = enabled;
    mDirtyBits.set(DIRTY_BIT_DITHER_ENABLED);
}

bool State::isPrimitiveRestartEnabled() const
{
    return mPrimitiveRestart;
}

void State::setPrimitiveRestart(bool enabled)
{
    mPrimitiveRestart = enabled;
    mDirtyBits.set(DIRTY_BIT_PRIMITIVE_RESTART_ENABLED);
}

void State::setEnableFeature(GLenum feature, bool enabled)
{
    switch (feature)
    {
        case GL_MULTISAMPLE_EXT:
            setMultisampling(enabled);
            break;
        case GL_SAMPLE_ALPHA_TO_ONE_EXT:
            setSampleAlphaToOne(enabled);
            break;
        case GL_CULL_FACE:
            setCullFace(enabled);
            break;
        case GL_POLYGON_OFFSET_FILL:
            setPolygonOffsetFill(enabled);
            break;
        case GL_SAMPLE_ALPHA_TO_COVERAGE:
            setSampleAlphaToCoverage(enabled);
            break;
        case GL_SAMPLE_COVERAGE:
            setSampleCoverage(enabled);
            break;
        case GL_SCISSOR_TEST:
            setScissorTest(enabled);
            break;
        case GL_STENCIL_TEST:
            setStencilTest(enabled);
            break;
        case GL_DEPTH_TEST:
            setDepthTest(enabled);
            break;
        case GL_BLEND:
            setBlend(enabled);
            break;
        case GL_DITHER:
            setDither(enabled);
            break;
        case GL_PRIMITIVE_RESTART_FIXED_INDEX:
            setPrimitiveRestart(enabled);
            break;
        case GL_RASTERIZER_DISCARD:
            setRasterizerDiscard(enabled);
            break;
        case GL_SAMPLE_MASK:
            setSampleMaskEnabled(enabled);
            break;
        case GL_DEBUG_OUTPUT_SYNCHRONOUS:
            mDebug.setOutputSynchronous(enabled);
            break;
        case GL_DEBUG_OUTPUT:
            mDebug.setOutputEnabled(enabled);
            break;
        case GL_FRAMEBUFFER_SRGB_EXT:
            setFramebufferSRGB(enabled);
            break;

        // GLES1 emulation
        case GL_ALPHA_TEST:
            mGLES1State.mAlphaTestEnabled = enabled;
            break;
        case GL_TEXTURE_2D:
            mGLES1State.mTexUnitEnables[mActiveSampler].set(TextureType::_2D, enabled);
            break;
        case GL_TEXTURE_CUBE_MAP:
            mGLES1State.mTexUnitEnables[mActiveSampler].set(TextureType::CubeMap, enabled);
            break;
        case GL_LIGHTING:
            mGLES1State.mLightingEnabled = enabled;
            break;
        case GL_LIGHT0:
        case GL_LIGHT1:
        case GL_LIGHT2:
        case GL_LIGHT3:
        case GL_LIGHT4:
        case GL_LIGHT5:
        case GL_LIGHT6:
        case GL_LIGHT7:
            mGLES1State.mLights[feature - GL_LIGHT0].enabled = enabled;
            break;
        case GL_NORMALIZE:
            mGLES1State.mNormalizeEnabled = enabled;
            break;
        case GL_RESCALE_NORMAL:
            mGLES1State.mRescaleNormalEnabled = enabled;
            break;
        case GL_COLOR_MATERIAL:
            mGLES1State.mColorMaterialEnabled = enabled;
            break;
        case GL_CLIP_PLANE0:
        case GL_CLIP_PLANE1:
        case GL_CLIP_PLANE2:
        case GL_CLIP_PLANE3:
        case GL_CLIP_PLANE4:
        case GL_CLIP_PLANE5:
            mGLES1State.mClipPlanes[feature - GL_CLIP_PLANE0].enabled = enabled;
            break;
        case GL_FOG:
            mGLES1State.mFogEnabled = enabled;
            break;
        case GL_POINT_SMOOTH:
            mGLES1State.mPointSmoothEnabled = enabled;
            break;
        case GL_LINE_SMOOTH:
            mGLES1State.mLineSmoothEnabled = enabled;
            break;
        case GL_POINT_SPRITE_OES:
            mGLES1State.mPointSpriteEnabled = enabled;
            break;
        case GL_COLOR_LOGIC_OP:
            mGLES1State.mLogicOpEnabled = enabled;
            break;
        default:
            UNREACHABLE();
    }
}

bool State::getEnableFeature(GLenum feature) const
{
    switch (feature)
    {
        case GL_MULTISAMPLE_EXT:
            return isMultisamplingEnabled();
        case GL_SAMPLE_ALPHA_TO_ONE_EXT:
            return isSampleAlphaToOneEnabled();
        case GL_CULL_FACE:
            return isCullFaceEnabled();
        case GL_POLYGON_OFFSET_FILL:
            return isPolygonOffsetFillEnabled();
        case GL_SAMPLE_ALPHA_TO_COVERAGE:
            return isSampleAlphaToCoverageEnabled();
        case GL_SAMPLE_COVERAGE:
            return isSampleCoverageEnabled();
        case GL_SCISSOR_TEST:
            return isScissorTestEnabled();
        case GL_STENCIL_TEST:
            return isStencilTestEnabled();
        case GL_DEPTH_TEST:
            return isDepthTestEnabled();
        case GL_BLEND:
            return isBlendEnabled();
        case GL_DITHER:
            return isDitherEnabled();
        case GL_PRIMITIVE_RESTART_FIXED_INDEX:
            return isPrimitiveRestartEnabled();
        case GL_RASTERIZER_DISCARD:
            return isRasterizerDiscardEnabled();
        case GL_SAMPLE_MASK:
            return isSampleMaskEnabled();
        case GL_DEBUG_OUTPUT_SYNCHRONOUS:
            return mDebug.isOutputSynchronous();
        case GL_DEBUG_OUTPUT:
            return mDebug.isOutputEnabled();
        case GL_BIND_GENERATES_RESOURCE_CHROMIUM:
            return isBindGeneratesResourceEnabled();
        case GL_CLIENT_ARRAYS_ANGLE:
            return areClientArraysEnabled();
        case GL_FRAMEBUFFER_SRGB_EXT:
            return getFramebufferSRGB();
        case GL_ROBUST_RESOURCE_INITIALIZATION_ANGLE:
            return mRobustResourceInit;
        case GL_PROGRAM_CACHE_ENABLED_ANGLE:
            return mProgramBinaryCacheEnabled;

        // GLES1 emulation
        case GL_ALPHA_TEST:
            return mGLES1State.mAlphaTestEnabled;
        case GL_VERTEX_ARRAY:
            return mGLES1State.mVertexArrayEnabled;
        case GL_NORMAL_ARRAY:
            return mGLES1State.mNormalArrayEnabled;
        case GL_COLOR_ARRAY:
            return mGLES1State.mColorArrayEnabled;
        case GL_POINT_SIZE_ARRAY_OES:
            return mGLES1State.mPointSizeArrayEnabled;
        case GL_TEXTURE_COORD_ARRAY:
            return mGLES1State.mTexCoordArrayEnabled[mGLES1State.mClientActiveTexture];
        case GL_TEXTURE_2D:
            return mGLES1State.mTexUnitEnables[mActiveSampler].test(TextureType::_2D);
        case GL_TEXTURE_CUBE_MAP:
            return mGLES1State.mTexUnitEnables[mActiveSampler].test(TextureType::CubeMap);
        case GL_LIGHTING:
            return mGLES1State.mLightingEnabled;
        case GL_LIGHT0:
        case GL_LIGHT1:
        case GL_LIGHT2:
        case GL_LIGHT3:
        case GL_LIGHT4:
        case GL_LIGHT5:
        case GL_LIGHT6:
        case GL_LIGHT7:
            return mGLES1State.mLights[feature - GL_LIGHT0].enabled;
        case GL_NORMALIZE:
            return mGLES1State.mNormalizeEnabled;
        case GL_RESCALE_NORMAL:
            return mGLES1State.mRescaleNormalEnabled;
        case GL_COLOR_MATERIAL:
            return mGLES1State.mColorMaterialEnabled;
        case GL_CLIP_PLANE0:
        case GL_CLIP_PLANE1:
        case GL_CLIP_PLANE2:
        case GL_CLIP_PLANE3:
        case GL_CLIP_PLANE4:
        case GL_CLIP_PLANE5:
            return mGLES1State.mClipPlanes[feature - GL_CLIP_PLANE0].enabled;
        case GL_FOG:
            return mGLES1State.mFogEnabled;
        case GL_POINT_SMOOTH:
            return mGLES1State.mPointSmoothEnabled;
        case GL_LINE_SMOOTH:
            return mGLES1State.mLineSmoothEnabled;
        case GL_POINT_SPRITE_OES:
            return mGLES1State.mPointSpriteEnabled;
        case GL_COLOR_LOGIC_OP:
            return mGLES1State.mLogicOpEnabled;
        default:
            UNREACHABLE();
            return false;
    }
}

void State::setLineWidth(GLfloat width)
{
    mLineWidth = width;
    mDirtyBits.set(DIRTY_BIT_LINE_WIDTH);
}

float State::getLineWidth() const
{
    return mLineWidth;
}

void State::setGenerateMipmapHint(GLenum hint)
{
    mGenerateMipmapHint = hint;
    mDirtyBits.set(DIRTY_BIT_GENERATE_MIPMAP_HINT);
}

void State::setFragmentShaderDerivativeHint(GLenum hint)
{
    mFragmentShaderDerivativeHint = hint;
    mDirtyBits.set(DIRTY_BIT_SHADER_DERIVATIVE_HINT);
    // TODO: Propagate the hint to shader translator so we can write
    // ddx, ddx_coarse, or ddx_fine depending on the hint.
    // Ignore for now. It is valid for implementations to ignore hint.
}

bool State::areClientArraysEnabled() const
{
    return mClientArraysEnabled;
}

void State::setViewportParams(GLint x, GLint y, GLsizei width, GLsizei height)
{
    mViewport.x      = x;
    mViewport.y      = y;
    mViewport.width  = width;
    mViewport.height = height;
    mDirtyBits.set(DIRTY_BIT_VIEWPORT);
}

const Rectangle &State::getViewport() const
{
    return mViewport;
}

void State::setActiveSampler(unsigned int active)
{
    mActiveSampler = active;
}

unsigned int State::getActiveSampler() const
{
    return static_cast<unsigned int>(mActiveSampler);
}

void State::setSamplerTexture(const Context *context, TextureType type, Texture *texture)
{
    mSamplerTextures[type][mActiveSampler].set(context, texture);
    mDirtyBits.set(DIRTY_BIT_TEXTURE_BINDINGS);
    mDirtyObjects.set(DIRTY_OBJECT_PROGRAM_TEXTURES);
}

Texture *State::getTargetTexture(TextureType type) const
{
    return getSamplerTexture(static_cast<unsigned int>(mActiveSampler), type);
}

GLuint State::getSamplerTextureId(unsigned int sampler, TextureType type) const
{
    ASSERT(sampler < mSamplerTextures[type].size());
    return mSamplerTextures[type][sampler].id();
}

void State::detachTexture(const Context *context, const TextureMap &zeroTextures, GLuint texture)
{
    // Textures have a detach method on State rather than a simple
    // removeBinding, because the zero/null texture objects are managed
    // separately, and don't have to go through the Context's maps or
    // the ResourceManager.

    // [OpenGL ES 2.0.24] section 3.8 page 84:
    // If a texture object is deleted, it is as if all texture units which are bound to that texture
    // object are rebound to texture object zero

    for (TextureType type : angle::AllEnums<TextureType>())
    {
        TextureBindingVector &textureVector = mSamplerTextures[type];
        for (BindingPointer<Texture> &binding : textureVector)
        {
            if (binding.id() == texture)
            {
                Texture *zeroTexture = zeroTextures[type].get();
                ASSERT(zeroTexture != nullptr);
                // Zero textures are the "default" textures instead of NULL
                binding.set(context, zeroTexture);
                mDirtyBits.set(DIRTY_BIT_TEXTURE_BINDINGS);
            }
        }
    }

    for (auto &bindingImageUnit : mImageUnits)
    {
        if (bindingImageUnit.texture.id() == texture)
        {
            bindingImageUnit.texture.set(context, nullptr);
            bindingImageUnit.level   = 0;
            bindingImageUnit.layered = false;
            bindingImageUnit.layer   = 0;
            bindingImageUnit.access  = GL_READ_ONLY;
            bindingImageUnit.format  = GL_R32UI;
            break;
        }
    }

    // [OpenGL ES 2.0.24] section 4.4 page 112:
    // If a texture object is deleted while its image is attached to the currently bound
    // framebuffer, then it is as if Texture2DAttachment had been called, with a texture of 0, for
    // each attachment point to which this image was attached in the currently bound framebuffer.

    if (mReadFramebuffer && mReadFramebuffer->detachTexture(context, texture))
    {
        mDirtyObjects.set(DIRTY_OBJECT_READ_FRAMEBUFFER);
    }

    if (mDrawFramebuffer && mDrawFramebuffer->detachTexture(context, texture))
    {
        mDirtyObjects.set(DIRTY_OBJECT_DRAW_FRAMEBUFFER);
    }
}

void State::initializeZeroTextures(const Context *context, const TextureMap &zeroTextures)
{
    for (TextureType type : angle::AllEnums<TextureType>())
    {
        for (size_t textureUnit = 0; textureUnit < mSamplerTextures[type].size(); ++textureUnit)
        {
            mSamplerTextures[type][textureUnit].set(context, zeroTextures[type].get());
        }
    }
}

void State::setSamplerBinding(const Context *context, GLuint textureUnit, Sampler *sampler)
{
    mSamplers[textureUnit].set(context, sampler);
    mDirtyBits.set(DIRTY_BIT_SAMPLER_BINDINGS);
    mDirtyObjects.set(DIRTY_OBJECT_PROGRAM_TEXTURES);
    // This is overly conservative as it assumes the sampler has never been bound.
    setSamplerDirty(textureUnit);
}

GLuint State::getSamplerId(GLuint textureUnit) const
{
    ASSERT(textureUnit < mSamplers.size());
    return mSamplers[textureUnit].id();
}

void State::detachSampler(const Context *context, GLuint sampler)
{
    // [OpenGL ES 3.0.2] section 3.8.2 pages 123-124:
    // If a sampler object that is currently bound to one or more texture units is
    // deleted, it is as though BindSampler is called once for each texture unit to
    // which the sampler is bound, with unit set to the texture unit and sampler set to zero.
    for (BindingPointer<Sampler> &samplerBinding : mSamplers)
    {
        if (samplerBinding.id() == sampler)
        {
            samplerBinding.set(context, nullptr);
            mDirtyBits.set(DIRTY_BIT_SAMPLER_BINDINGS);
        }
    }
}

void State::setRenderbufferBinding(const Context *context, Renderbuffer *renderbuffer)
{
    mRenderbuffer.set(context, renderbuffer);
    mDirtyBits.set(DIRTY_BIT_RENDERBUFFER_BINDING);
}

GLuint State::getRenderbufferId() const
{
    return mRenderbuffer.id();
}

Renderbuffer *State::getCurrentRenderbuffer() const
{
    return mRenderbuffer.get();
}

void State::detachRenderbuffer(const Context *context, GLuint renderbuffer)
{
    // [OpenGL ES 2.0.24] section 4.4 page 109:
    // If a renderbuffer that is currently bound to RENDERBUFFER is deleted, it is as though
    // BindRenderbuffer had been executed with the target RENDERBUFFER and name of zero.

    if (mRenderbuffer.id() == renderbuffer)
    {
        setRenderbufferBinding(context, nullptr);
    }

    // [OpenGL ES 2.0.24] section 4.4 page 111:
    // If a renderbuffer object is deleted while its image is attached to the currently bound
    // framebuffer, then it is as if FramebufferRenderbuffer had been called, with a renderbuffer of
    // 0, for each attachment point to which this image was attached in the currently bound
    // framebuffer.

    Framebuffer *readFramebuffer = mReadFramebuffer;
    Framebuffer *drawFramebuffer = mDrawFramebuffer;

    if (readFramebuffer && readFramebuffer->detachRenderbuffer(context, renderbuffer))
    {
        mDirtyObjects.set(DIRTY_OBJECT_READ_FRAMEBUFFER);
    }

    if (drawFramebuffer && drawFramebuffer != readFramebuffer)
    {
        if (drawFramebuffer->detachRenderbuffer(context, renderbuffer))
        {
            mDirtyObjects.set(DIRTY_OBJECT_DRAW_FRAMEBUFFER);
        }
    }
}

void State::setReadFramebufferBinding(Framebuffer *framebuffer)
{
    if (mReadFramebuffer == framebuffer)
        return;

    mReadFramebuffer = framebuffer;
    mDirtyBits.set(DIRTY_BIT_READ_FRAMEBUFFER_BINDING);

    if (mReadFramebuffer && mReadFramebuffer->hasAnyDirtyBit())
    {
        mDirtyObjects.set(DIRTY_OBJECT_READ_FRAMEBUFFER);
    }
}

void State::setDrawFramebufferBinding(Framebuffer *framebuffer)
{
    if (mDrawFramebuffer == framebuffer)
        return;

    mDrawFramebuffer = framebuffer;
    mDirtyBits.set(DIRTY_BIT_DRAW_FRAMEBUFFER_BINDING);

    if (mDrawFramebuffer && mDrawFramebuffer->hasAnyDirtyBit())
    {
        mDirtyObjects.set(DIRTY_OBJECT_DRAW_FRAMEBUFFER);
    }
}

Framebuffer *State::getTargetFramebuffer(GLenum target) const
{
    switch (target)
    {
        case GL_READ_FRAMEBUFFER_ANGLE:
            return mReadFramebuffer;
        case GL_DRAW_FRAMEBUFFER_ANGLE:
        case GL_FRAMEBUFFER:
            return mDrawFramebuffer;
        default:
            UNREACHABLE();
            return nullptr;
    }
}

Framebuffer *State::getReadFramebuffer() const
{
    return mReadFramebuffer;
}

bool State::removeReadFramebufferBinding(GLuint framebuffer)
{
    if (mReadFramebuffer != nullptr && mReadFramebuffer->id() == framebuffer)
    {
        setReadFramebufferBinding(nullptr);
        return true;
    }

    return false;
}

bool State::removeDrawFramebufferBinding(GLuint framebuffer)
{
    if (mReadFramebuffer != nullptr && mDrawFramebuffer->id() == framebuffer)
    {
        setDrawFramebufferBinding(nullptr);
        return true;
    }

    return false;
}

void State::setVertexArrayBinding(const Context *context, VertexArray *vertexArray)
{
    if (mVertexArray == vertexArray)
        return;
    if (mVertexArray)
        mVertexArray->onBindingChanged(context, -1);
    mVertexArray = vertexArray;
    if (vertexArray)
        vertexArray->onBindingChanged(context, 1);
    mDirtyBits.set(DIRTY_BIT_VERTEX_ARRAY_BINDING);

    if (mVertexArray && mVertexArray->hasAnyDirtyBit())
    {
        mDirtyObjects.set(DIRTY_OBJECT_VERTEX_ARRAY);
    }
}

GLuint State::getVertexArrayId() const
{
    ASSERT(mVertexArray != nullptr);
    return mVertexArray->id();
}

bool State::removeVertexArrayBinding(const Context *context, GLuint vertexArray)
{
    if (mVertexArray && mVertexArray->id() == vertexArray)
    {
        mVertexArray->onBindingChanged(context, -1);
        mVertexArray = nullptr;
        mDirtyBits.set(DIRTY_BIT_VERTEX_ARRAY_BINDING);
        mDirtyObjects.set(DIRTY_OBJECT_VERTEX_ARRAY);
        return true;
    }

    return false;
}

void State::bindVertexBuffer(const Context *context,
                             GLuint bindingIndex,
                             Buffer *boundBuffer,
                             GLintptr offset,
                             GLsizei stride)
{
    getVertexArray()->bindVertexBuffer(context, bindingIndex, boundBuffer, offset, stride);
    mDirtyObjects.set(DIRTY_OBJECT_VERTEX_ARRAY);
}

void State::setVertexAttribBinding(const Context *context, GLuint attribIndex, GLuint bindingIndex)
{
    getVertexArray()->setVertexAttribBinding(context, attribIndex, bindingIndex);
    mDirtyObjects.set(DIRTY_OBJECT_VERTEX_ARRAY);
}

void State::setVertexAttribFormat(GLuint attribIndex,
                                  GLint size,
                                  GLenum type,
                                  bool normalized,
                                  bool pureInteger,
                                  GLuint relativeOffset)
{
    getVertexArray()->setVertexAttribFormat(attribIndex, size, type, normalized, pureInteger,
                                            relativeOffset);
    mDirtyObjects.set(DIRTY_OBJECT_VERTEX_ARRAY);
}

void State::setVertexBindingDivisor(GLuint bindingIndex, GLuint divisor)
{
    getVertexArray()->setVertexBindingDivisor(bindingIndex, divisor);
    mDirtyObjects.set(DIRTY_OBJECT_VERTEX_ARRAY);
}

void State::setProgram(const Context *context, Program *newProgram)
{
    if (mProgram != newProgram)
    {
        if (mProgram)
        {
            mProgram->release(context);
        }

        mProgram = newProgram;

        if (mProgram)
        {
            newProgram->addRef();
            mDirtyObjects.set(DIRTY_OBJECT_PROGRAM_TEXTURES);
        }
        mDirtyBits.set(DIRTY_BIT_PROGRAM_EXECUTABLE);
        mDirtyBits.set(DIRTY_BIT_PROGRAM_BINDING);
        mDirtyObjects.set(DIRTY_OBJECT_PROGRAM);
    }
}

void State::setTransformFeedbackBinding(const Context *context,
                                        TransformFeedback *transformFeedback)
{
    if (transformFeedback == mTransformFeedback.get())
        return;
    if (mTransformFeedback.get())
        mTransformFeedback->onBindingChanged(context, false);
    mTransformFeedback.set(context, transformFeedback);
    if (mTransformFeedback.get())
        mTransformFeedback->onBindingChanged(context, true);
    mDirtyBits.set(DIRTY_BIT_TRANSFORM_FEEDBACK_BINDING);
}

bool State::isTransformFeedbackActiveUnpaused() const
{
    TransformFeedback *curTransformFeedback = mTransformFeedback.get();
    return curTransformFeedback && curTransformFeedback->isActive() &&
           !curTransformFeedback->isPaused();
}

bool State::removeTransformFeedbackBinding(const Context *context, GLuint transformFeedback)
{
    if (mTransformFeedback.id() == transformFeedback)
    {
        if (mTransformFeedback.get())
            mTransformFeedback->onBindingChanged(context, false);
        mTransformFeedback.set(context, nullptr);
        return true;
    }

    return false;
}

void State::setProgramPipelineBinding(const Context *context, ProgramPipeline *pipeline)
{
    mProgramPipeline.set(context, pipeline);
}

void State::detachProgramPipeline(const Context *context, GLuint pipeline)
{
    mProgramPipeline.set(context, nullptr);
}

bool State::isQueryActive(QueryType type) const
{
    const Query *query = mActiveQueries[type].get();
    if (query != nullptr)
    {
        return true;
    }

    QueryType alternativeType;
    if (GetAlternativeQueryType(type, &alternativeType))
    {
        query = mActiveQueries[alternativeType].get();
        return query != nullptr;
    }

    return false;
}

bool State::isQueryActive(Query *query) const
{
    for (auto &queryPointer : mActiveQueries)
    {
        if (queryPointer.get() == query)
        {
            return true;
        }
    }

    return false;
}

void State::setActiveQuery(const Context *context, QueryType type, Query *query)
{
    mActiveQueries[type].set(context, query);
}

GLuint State::getActiveQueryId(QueryType type) const
{
    const Query *query = getActiveQuery(type);
    return (query ? query->id() : 0u);
}

Query *State::getActiveQuery(QueryType type) const
{
    return mActiveQueries[type].get();
}

void State::setBufferBinding(const Context *context, BufferBinding target, Buffer *buffer)
{
    switch (target)
    {
        case BufferBinding::PixelPack:
            UpdateNonTFBufferBinding(context, &mBoundBuffers[target], buffer);
            mDirtyBits.set(DIRTY_BIT_PACK_BUFFER_BINDING);
            break;
        case BufferBinding::PixelUnpack:
            UpdateNonTFBufferBinding(context, &mBoundBuffers[target], buffer);
            mDirtyBits.set(DIRTY_BIT_UNPACK_BUFFER_BINDING);
            break;
        case BufferBinding::DrawIndirect:
            UpdateNonTFBufferBinding(context, &mBoundBuffers[target], buffer);
            mDirtyBits.set(DIRTY_BIT_DRAW_INDIRECT_BUFFER_BINDING);
            break;
        case BufferBinding::DispatchIndirect:
            UpdateNonTFBufferBinding(context, &mBoundBuffers[target], buffer);
            mDirtyBits.set(DIRTY_BIT_DISPATCH_INDIRECT_BUFFER_BINDING);
            break;
        case BufferBinding::ElementArray:
            getVertexArray()->setElementArrayBuffer(context, buffer);
            mDirtyObjects.set(DIRTY_OBJECT_VERTEX_ARRAY);
            break;
        case BufferBinding::ShaderStorage:
            UpdateNonTFBufferBinding(context, &mBoundBuffers[target], buffer);
            mDirtyBits.set(DIRTY_BIT_SHADER_STORAGE_BUFFER_BINDING);
            break;
        case BufferBinding::Uniform:
            UpdateBufferBinding(context, &mBoundBuffers[target], buffer, target);
            mDirtyBits.set(DIRTY_BIT_UNIFORM_BUFFER_BINDINGS);
            break;
        case BufferBinding::AtomicCounter:
            UpdateBufferBinding(context, &mBoundBuffers[target], buffer, target);
            mDirtyBits.set(DIRTY_BIT_ATOMIC_COUNTER_BUFFER_BINDING);
            break;
        default:
            UpdateBufferBinding(context, &mBoundBuffers[target], buffer, target);
            break;
    }
}

void State::setIndexedBufferBinding(const Context *context,
                                    BufferBinding target,
                                    GLuint index,
                                    Buffer *buffer,
                                    GLintptr offset,
                                    GLsizeiptr size)
{
    setBufferBinding(context, target, buffer);

    switch (target)
    {
        case BufferBinding::TransformFeedback:
            mTransformFeedback->bindIndexedBuffer(context, index, buffer, offset, size);
            setBufferBinding(context, target, buffer);
            break;
        case BufferBinding::Uniform:
            UpdateIndexedBufferBinding(context, &mUniformBuffers[index], buffer, target, offset,
                                       size);
            break;
        case BufferBinding::AtomicCounter:
            UpdateIndexedBufferBinding(context, &mAtomicCounterBuffers[index], buffer, target,
                                       offset, size);
            break;
        case BufferBinding::ShaderStorage:
            UpdateIndexedBufferBinding(context, &mShaderStorageBuffers[index], buffer, target,
                                       offset, size);
            break;
        default:
            UNREACHABLE();
            break;
    }
}

const OffsetBindingPointer<Buffer> &State::getIndexedUniformBuffer(size_t index) const
{
    ASSERT(static_cast<size_t>(index) < mUniformBuffers.size());
    return mUniformBuffers[index];
}

const OffsetBindingPointer<Buffer> &State::getIndexedAtomicCounterBuffer(size_t index) const
{
    ASSERT(static_cast<size_t>(index) < mAtomicCounterBuffers.size());
    return mAtomicCounterBuffers[index];
}

const OffsetBindingPointer<Buffer> &State::getIndexedShaderStorageBuffer(size_t index) const
{
    ASSERT(static_cast<size_t>(index) < mShaderStorageBuffers.size());
    return mShaderStorageBuffers[index];
}

Buffer *State::getTargetBuffer(BufferBinding target) const
{
    switch (target)
    {
        case BufferBinding::ElementArray:
            return getVertexArray()->getElementArrayBuffer().get();
        default:
            return mBoundBuffers[target].get();
    }
}

void State::detachBuffer(const Context *context, const Buffer *buffer)
{
    if (!buffer->isBound())
    {
        return;
    }
    GLuint bufferName = buffer->id();
    for (auto target : angle::AllEnums<BufferBinding>())
    {
        if (mBoundBuffers[target].id() == bufferName)
        {
            UpdateBufferBinding(context, &mBoundBuffers[target], nullptr, target);
        }
    }

    TransformFeedback *curTransformFeedback = getCurrentTransformFeedback();
    if (curTransformFeedback)
    {
        curTransformFeedback->detachBuffer(context, bufferName);
    }

    getVertexArray()->detachBuffer(context, bufferName);

    for (auto &buf : mUniformBuffers)
    {
        if (buf.id() == bufferName)
        {
            UpdateIndexedBufferBinding(context, &buf, nullptr, BufferBinding::Uniform, 0, 0);
        }
    }

    for (auto &buf : mAtomicCounterBuffers)
    {
        if (buf.id() == bufferName)
        {
            UpdateIndexedBufferBinding(context, &buf, nullptr, BufferBinding::AtomicCounter, 0, 0);
        }
    }

    for (auto &buf : mShaderStorageBuffers)
    {
        if (buf.id() == bufferName)
        {
            UpdateIndexedBufferBinding(context, &buf, nullptr, BufferBinding::ShaderStorage, 0, 0);
        }
    }
}

void State::setEnableVertexAttribArray(unsigned int attribNum, bool enabled)
{
    getVertexArray()->enableAttribute(attribNum, enabled);
    mDirtyObjects.set(DIRTY_OBJECT_VERTEX_ARRAY);
}

void State::setVertexAttribf(GLuint index, const GLfloat values[4])
{
    ASSERT(static_cast<size_t>(index) < mVertexAttribCurrentValues.size());
    mVertexAttribCurrentValues[index].setFloatValues(values);
    mDirtyBits.set(DIRTY_BIT_CURRENT_VALUES);
    mDirtyCurrentValues.set(index);
    mCurrentValuesTypeMask.setIndex(GL_FLOAT, index);
}

void State::setVertexAttribu(GLuint index, const GLuint values[4])
{
    ASSERT(static_cast<size_t>(index) < mVertexAttribCurrentValues.size());
    mVertexAttribCurrentValues[index].setUnsignedIntValues(values);
    mDirtyBits.set(DIRTY_BIT_CURRENT_VALUES);
    mDirtyCurrentValues.set(index);
    mCurrentValuesTypeMask.setIndex(GL_UNSIGNED_INT, index);
}

void State::setVertexAttribi(GLuint index, const GLint values[4])
{
    ASSERT(static_cast<size_t>(index) < mVertexAttribCurrentValues.size());
    mVertexAttribCurrentValues[index].setIntValues(values);
    mDirtyBits.set(DIRTY_BIT_CURRENT_VALUES);
    mDirtyCurrentValues.set(index);
    mCurrentValuesTypeMask.setIndex(GL_INT, index);
}

void State::setVertexAttribPointer(const Context *context,
                                   unsigned int attribNum,
                                   Buffer *boundBuffer,
                                   GLint size,
                                   GLenum type,
                                   bool normalized,
                                   bool pureInteger,
                                   GLsizei stride,
                                   const void *pointer)
{
    getVertexArray()->setVertexAttribPointer(context, attribNum, boundBuffer, size, type,
                                             normalized, pureInteger, stride, pointer);
    mDirtyObjects.set(DIRTY_OBJECT_VERTEX_ARRAY);
}

void State::setVertexAttribDivisor(const Context *context, GLuint index, GLuint divisor)
{
    getVertexArray()->setVertexAttribDivisor(context, index, divisor);
    mDirtyObjects.set(DIRTY_OBJECT_VERTEX_ARRAY);
}

const VertexAttribCurrentValueData &State::getVertexAttribCurrentValue(size_t attribNum) const
{
    ASSERT(attribNum < mVertexAttribCurrentValues.size());
    return mVertexAttribCurrentValues[attribNum];
}

const std::vector<VertexAttribCurrentValueData> &State::getVertexAttribCurrentValues() const
{
    return mVertexAttribCurrentValues;
}

const void *State::getVertexAttribPointer(unsigned int attribNum) const
{
    return getVertexArray()->getVertexAttribute(attribNum).pointer;
}

void State::setPackAlignment(GLint alignment)
{
    mPack.alignment = alignment;
    mDirtyBits.set(DIRTY_BIT_PACK_STATE);
}

GLint State::getPackAlignment() const
{
    return mPack.alignment;
}

void State::setPackReverseRowOrder(bool reverseRowOrder)
{
    mPack.reverseRowOrder = reverseRowOrder;
    mDirtyBits.set(DIRTY_BIT_PACK_STATE);
}

bool State::getPackReverseRowOrder() const
{
    return mPack.reverseRowOrder;
}

void State::setPackRowLength(GLint rowLength)
{
    mPack.rowLength = rowLength;
    mDirtyBits.set(DIRTY_BIT_PACK_STATE);
}

GLint State::getPackRowLength() const
{
    return mPack.rowLength;
}

void State::setPackSkipRows(GLint skipRows)
{
    mPack.skipRows = skipRows;
    mDirtyBits.set(DIRTY_BIT_PACK_STATE);
}

GLint State::getPackSkipRows() const
{
    return mPack.skipRows;
}

void State::setPackSkipPixels(GLint skipPixels)
{
    mPack.skipPixels = skipPixels;
    mDirtyBits.set(DIRTY_BIT_PACK_STATE);
}

GLint State::getPackSkipPixels() const
{
    return mPack.skipPixels;
}

const PixelPackState &State::getPackState() const
{
    return mPack;
}

PixelPackState &State::getPackState()
{
    return mPack;
}

void State::setUnpackAlignment(GLint alignment)
{
    mUnpack.alignment = alignment;
    mDirtyBits.set(DIRTY_BIT_UNPACK_STATE);
}

GLint State::getUnpackAlignment() const
{
    return mUnpack.alignment;
}

void State::setUnpackRowLength(GLint rowLength)
{
    mUnpack.rowLength = rowLength;
    mDirtyBits.set(DIRTY_BIT_UNPACK_STATE);
}

GLint State::getUnpackRowLength() const
{
    return mUnpack.rowLength;
}

void State::setUnpackImageHeight(GLint imageHeight)
{
    mUnpack.imageHeight = imageHeight;
    mDirtyBits.set(DIRTY_BIT_UNPACK_STATE);
}

GLint State::getUnpackImageHeight() const
{
    return mUnpack.imageHeight;
}

void State::setUnpackSkipImages(GLint skipImages)
{
    mUnpack.skipImages = skipImages;
    mDirtyBits.set(DIRTY_BIT_UNPACK_STATE);
}

GLint State::getUnpackSkipImages() const
{
    return mUnpack.skipImages;
}

void State::setUnpackSkipRows(GLint skipRows)
{
    mUnpack.skipRows = skipRows;
    mDirtyBits.set(DIRTY_BIT_UNPACK_STATE);
}

GLint State::getUnpackSkipRows() const
{
    return mUnpack.skipRows;
}

void State::setUnpackSkipPixels(GLint skipPixels)
{
    mUnpack.skipPixels = skipPixels;
    mDirtyBits.set(DIRTY_BIT_UNPACK_STATE);
}

GLint State::getUnpackSkipPixels() const
{
    return mUnpack.skipPixels;
}

const PixelUnpackState &State::getUnpackState() const
{
    return mUnpack;
}

PixelUnpackState &State::getUnpackState()
{
    return mUnpack;
}

const Debug &State::getDebug() const
{
    return mDebug;
}

Debug &State::getDebug()
{
    return mDebug;
}

void State::setCoverageModulation(GLenum components)
{
    mCoverageModulation = components;
    mDirtyBits.set(DIRTY_BIT_COVERAGE_MODULATION);
}

GLenum State::getCoverageModulation() const
{
    return mCoverageModulation;
}

void State::loadPathRenderingMatrix(GLenum matrixMode, const GLfloat *matrix)
{
    if (matrixMode == GL_PATH_MODELVIEW_CHROMIUM)
    {
        memcpy(mPathMatrixMV, matrix, 16 * sizeof(GLfloat));
        mDirtyBits.set(DIRTY_BIT_PATH_RENDERING);
    }
    else if (matrixMode == GL_PATH_PROJECTION_CHROMIUM)
    {
        memcpy(mPathMatrixProj, matrix, 16 * sizeof(GLfloat));
        mDirtyBits.set(DIRTY_BIT_PATH_RENDERING);
    }
    else
    {
        UNREACHABLE();
    }
}

const GLfloat *State::getPathRenderingMatrix(GLenum which) const
{
    if (which == GL_PATH_MODELVIEW_MATRIX_CHROMIUM)
    {
        return mPathMatrixMV;
    }
    else if (which == GL_PATH_PROJECTION_MATRIX_CHROMIUM)
    {
        return mPathMatrixProj;
    }

    UNREACHABLE();
    return nullptr;
}

void State::setPathStencilFunc(GLenum func, GLint ref, GLuint mask)
{
    mPathStencilFunc = func;
    mPathStencilRef  = ref;
    mPathStencilMask = mask;
    mDirtyBits.set(DIRTY_BIT_PATH_RENDERING);
}

GLenum State::getPathStencilFunc() const
{
    return mPathStencilFunc;
}

GLint State::getPathStencilRef() const
{
    return mPathStencilRef;
}

GLuint State::getPathStencilMask() const
{
    return mPathStencilMask;
}

void State::setFramebufferSRGB(bool sRGB)
{
    mFramebufferSRGB = sRGB;
    mDirtyBits.set(DIRTY_BIT_FRAMEBUFFER_SRGB);
}

bool State::getFramebufferSRGB() const
{
    return mFramebufferSRGB;
}

void State::setMaxShaderCompilerThreads(GLuint count)
{
    mMaxShaderCompilerThreads = count;
}

GLuint State::getMaxShaderCompilerThreads() const
{
    return mMaxShaderCompilerThreads;
}

void State::getBooleanv(GLenum pname, GLboolean *params)
{
    switch (pname)
    {
        case GL_SAMPLE_COVERAGE_INVERT:
            *params = mSampleCoverageInvert;
            break;
        case GL_DEPTH_WRITEMASK:
            *params = mDepthStencil.depthMask;
            break;
        case GL_COLOR_WRITEMASK:
            params[0] = mBlend.colorMaskRed;
            params[1] = mBlend.colorMaskGreen;
            params[2] = mBlend.colorMaskBlue;
            params[3] = mBlend.colorMaskAlpha;
            break;
        case GL_CULL_FACE:
            *params = mRasterizer.cullFace;
            break;
        case GL_POLYGON_OFFSET_FILL:
            *params = mRasterizer.polygonOffsetFill;
            break;
        case GL_SAMPLE_ALPHA_TO_COVERAGE:
            *params = mBlend.sampleAlphaToCoverage;
            break;
        case GL_SAMPLE_COVERAGE:
            *params = mSampleCoverage;
            break;
        case GL_SAMPLE_MASK:
            *params = mSampleMask;
            break;
        case GL_SCISSOR_TEST:
            *params = mScissorTest;
            break;
        case GL_STENCIL_TEST:
            *params = mDepthStencil.stencilTest;
            break;
        case GL_DEPTH_TEST:
            *params = mDepthStencil.depthTest;
            break;
        case GL_BLEND:
            *params = mBlend.blend;
            break;
        case GL_DITHER:
            *params = mBlend.dither;
            break;
        case GL_TRANSFORM_FEEDBACK_ACTIVE:
            *params = getCurrentTransformFeedback()->isActive() ? GL_TRUE : GL_FALSE;
            break;
        case GL_TRANSFORM_FEEDBACK_PAUSED:
            *params = getCurrentTransformFeedback()->isPaused() ? GL_TRUE : GL_FALSE;
            break;
        case GL_PRIMITIVE_RESTART_FIXED_INDEX:
            *params = mPrimitiveRestart;
            break;
        case GL_RASTERIZER_DISCARD:
            *params = isRasterizerDiscardEnabled() ? GL_TRUE : GL_FALSE;
            break;
        case GL_DEBUG_OUTPUT_SYNCHRONOUS:
            *params = mDebug.isOutputSynchronous() ? GL_TRUE : GL_FALSE;
            break;
        case GL_DEBUG_OUTPUT:
            *params = mDebug.isOutputEnabled() ? GL_TRUE : GL_FALSE;
            break;
        case GL_MULTISAMPLE_EXT:
            *params = mMultiSampling;
            break;
        case GL_SAMPLE_ALPHA_TO_ONE_EXT:
            *params = mSampleAlphaToOne;
            break;
        case GL_BIND_GENERATES_RESOURCE_CHROMIUM:
            *params = isBindGeneratesResourceEnabled() ? GL_TRUE : GL_FALSE;
            break;
        case GL_CLIENT_ARRAYS_ANGLE:
            *params = areClientArraysEnabled() ? GL_TRUE : GL_FALSE;
            break;
        case GL_FRAMEBUFFER_SRGB_EXT:
            *params = getFramebufferSRGB() ? GL_TRUE : GL_FALSE;
            break;
        case GL_ROBUST_RESOURCE_INITIALIZATION_ANGLE:
            *params = mRobustResourceInit ? GL_TRUE : GL_FALSE;
            break;
        case GL_PROGRAM_CACHE_ENABLED_ANGLE:
            *params = mProgramBinaryCacheEnabled ? GL_TRUE : GL_FALSE;
            break;
        case GL_LIGHT_MODEL_TWO_SIDE:
            *params = IsLightModelTwoSided(&mGLES1State);
            break;
        default:
            UNREACHABLE();
            break;
    }
}

void State::getFloatv(GLenum pname, GLfloat *params)
{
    // Please note: DEPTH_CLEAR_VALUE is included in our internal getFloatv implementation
    // because it is stored as a float, despite the fact that the GL ES 2.0 spec names
    // GetIntegerv as its native query function. As it would require conversion in any
    // case, this should make no difference to the calling application.
    switch (pname)
    {
        case GL_LINE_WIDTH:
            *params = mLineWidth;
            break;
        case GL_SAMPLE_COVERAGE_VALUE:
            *params = mSampleCoverageValue;
            break;
        case GL_DEPTH_CLEAR_VALUE:
            *params = mDepthClearValue;
            break;
        case GL_POLYGON_OFFSET_FACTOR:
            *params = mRasterizer.polygonOffsetFactor;
            break;
        case GL_POLYGON_OFFSET_UNITS:
            *params = mRasterizer.polygonOffsetUnits;
            break;
        case GL_DEPTH_RANGE:
            params[0] = mNearZ;
            params[1] = mFarZ;
            break;
        case GL_COLOR_CLEAR_VALUE:
            params[0] = mColorClearValue.red;
            params[1] = mColorClearValue.green;
            params[2] = mColorClearValue.blue;
            params[3] = mColorClearValue.alpha;
            break;
        case GL_BLEND_COLOR:
            params[0] = mBlendColor.red;
            params[1] = mBlendColor.green;
            params[2] = mBlendColor.blue;
            params[3] = mBlendColor.alpha;
            break;
        case GL_MULTISAMPLE_EXT:
            *params = static_cast<GLfloat>(mMultiSampling);
            break;
        case GL_SAMPLE_ALPHA_TO_ONE_EXT:
            *params = static_cast<GLfloat>(mSampleAlphaToOne);
            break;
        case GL_COVERAGE_MODULATION_CHROMIUM:
            params[0] = static_cast<GLfloat>(mCoverageModulation);
            break;
        case GL_ALPHA_TEST_REF:
            *params = mGLES1State.mAlphaTestRef;
            break;
        case GL_CURRENT_COLOR:
        {
            const auto &color = mGLES1State.mCurrentColor;
            params[0]         = color.red;
            params[1]         = color.green;
            params[2]         = color.blue;
            params[3]         = color.alpha;
            break;
        }
        case GL_CURRENT_NORMAL:
        {
            const auto &normal = mGLES1State.mCurrentNormal;
            params[0]          = normal[0];
            params[1]          = normal[1];
            params[2]          = normal[2];
            break;
        }
        case GL_CURRENT_TEXTURE_COORDS:
        {
            const auto &texcoord = mGLES1State.mCurrentTextureCoords[mActiveSampler];
            params[0]            = texcoord.s;
            params[1]            = texcoord.t;
            params[2]            = texcoord.r;
            params[3]            = texcoord.q;
            break;
        }
        case GL_MODELVIEW_MATRIX:
            memcpy(params, mGLES1State.mModelviewMatrices.back().data(), 16 * sizeof(GLfloat));
            break;
        case GL_PROJECTION_MATRIX:
            memcpy(params, mGLES1State.mProjectionMatrices.back().data(), 16 * sizeof(GLfloat));
            break;
        case GL_TEXTURE_MATRIX:
            memcpy(params, mGLES1State.mTextureMatrices[mActiveSampler].back().data(),
                   16 * sizeof(GLfloat));
            break;
        case GL_LIGHT_MODEL_AMBIENT:
            GetLightModelParameters(&mGLES1State, pname, params);
            break;
        case GL_FOG_MODE:
        case GL_FOG_DENSITY:
        case GL_FOG_START:
        case GL_FOG_END:
        case GL_FOG_COLOR:
            GetFogParameters(&mGLES1State, pname, params);
            break;
        case GL_POINT_SIZE:
            GetPointSize(&mGLES1State, params);
            break;
        case GL_POINT_SIZE_MIN:
        case GL_POINT_SIZE_MAX:
        case GL_POINT_FADE_THRESHOLD_SIZE:
        case GL_POINT_DISTANCE_ATTENUATION:
            GetPointParameter(&mGLES1State, FromGLenum<PointParameter>(pname), params);
            break;
        default:
            UNREACHABLE();
            break;
    }
}

Error State::getIntegerv(const Context *context, GLenum pname, GLint *params)
{
    if (pname >= GL_DRAW_BUFFER0_EXT && pname <= GL_DRAW_BUFFER15_EXT)
    {
        unsigned int colorAttachment = (pname - GL_DRAW_BUFFER0_EXT);
        ASSERT(colorAttachment < mMaxDrawBuffers);
        Framebuffer *framebuffer = mDrawFramebuffer;
        *params                  = framebuffer->getDrawBufferState(colorAttachment);
        return NoError();
    }

    // Please note: DEPTH_CLEAR_VALUE is not included in our internal getIntegerv implementation
    // because it is stored as a float, despite the fact that the GL ES 2.0 spec names
    // GetIntegerv as its native query function. As it would require conversion in any
    // case, this should make no difference to the calling application. You may find it in
    // State::getFloatv.
    switch (pname)
    {
        case GL_ARRAY_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::Array].id();
            break;
        case GL_DRAW_INDIRECT_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::DrawIndirect].id();
            break;
        case GL_ELEMENT_ARRAY_BUFFER_BINDING:
            *params = getVertexArray()->getElementArrayBuffer().id();
            break;
        case GL_DRAW_FRAMEBUFFER_BINDING:
            static_assert(GL_DRAW_FRAMEBUFFER_BINDING == GL_DRAW_FRAMEBUFFER_BINDING_ANGLE,
                          "Enum mismatch");
            *params = mDrawFramebuffer->id();
            break;
        case GL_READ_FRAMEBUFFER_BINDING:
            static_assert(GL_READ_FRAMEBUFFER_BINDING == GL_READ_FRAMEBUFFER_BINDING_ANGLE,
                          "Enum mismatch");
            *params = mReadFramebuffer->id();
            break;
        case GL_RENDERBUFFER_BINDING:
            *params = mRenderbuffer.id();
            break;
        case GL_VERTEX_ARRAY_BINDING:
            *params = mVertexArray->id();
            break;
        case GL_CURRENT_PROGRAM:
            *params = mProgram ? mProgram->id() : 0;
            break;
        case GL_PACK_ALIGNMENT:
            *params = mPack.alignment;
            break;
        case GL_PACK_REVERSE_ROW_ORDER_ANGLE:
            *params = mPack.reverseRowOrder;
            break;
        case GL_PACK_ROW_LENGTH:
            *params = mPack.rowLength;
            break;
        case GL_PACK_SKIP_ROWS:
            *params = mPack.skipRows;
            break;
        case GL_PACK_SKIP_PIXELS:
            *params = mPack.skipPixels;
            break;
        case GL_UNPACK_ALIGNMENT:
            *params = mUnpack.alignment;
            break;
        case GL_UNPACK_ROW_LENGTH:
            *params = mUnpack.rowLength;
            break;
        case GL_UNPACK_IMAGE_HEIGHT:
            *params = mUnpack.imageHeight;
            break;
        case GL_UNPACK_SKIP_IMAGES:
            *params = mUnpack.skipImages;
            break;
        case GL_UNPACK_SKIP_ROWS:
            *params = mUnpack.skipRows;
            break;
        case GL_UNPACK_SKIP_PIXELS:
            *params = mUnpack.skipPixels;
            break;
        case GL_GENERATE_MIPMAP_HINT:
            *params = mGenerateMipmapHint;
            break;
        case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES:
            *params = mFragmentShaderDerivativeHint;
            break;
        case GL_ACTIVE_TEXTURE:
            *params = (static_cast<GLint>(mActiveSampler) + GL_TEXTURE0);
            break;
        case GL_STENCIL_FUNC:
            *params = mDepthStencil.stencilFunc;
            break;
        case GL_STENCIL_REF:
            *params = mStencilRef;
            break;
        case GL_STENCIL_VALUE_MASK:
            *params = CastMaskValue(context, mDepthStencil.stencilMask);
            break;
        case GL_STENCIL_BACK_FUNC:
            *params = mDepthStencil.stencilBackFunc;
            break;
        case GL_STENCIL_BACK_REF:
            *params = mStencilBackRef;
            break;
        case GL_STENCIL_BACK_VALUE_MASK:
            *params = CastMaskValue(context, mDepthStencil.stencilBackMask);
            break;
        case GL_STENCIL_FAIL:
            *params = mDepthStencil.stencilFail;
            break;
        case GL_STENCIL_PASS_DEPTH_FAIL:
            *params = mDepthStencil.stencilPassDepthFail;
            break;
        case GL_STENCIL_PASS_DEPTH_PASS:
            *params = mDepthStencil.stencilPassDepthPass;
            break;
        case GL_STENCIL_BACK_FAIL:
            *params = mDepthStencil.stencilBackFail;
            break;
        case GL_STENCIL_BACK_PASS_DEPTH_FAIL:
            *params = mDepthStencil.stencilBackPassDepthFail;
            break;
        case GL_STENCIL_BACK_PASS_DEPTH_PASS:
            *params = mDepthStencil.stencilBackPassDepthPass;
            break;
        case GL_DEPTH_FUNC:
            *params = mDepthStencil.depthFunc;
            break;
        case GL_BLEND_SRC_RGB:
            *params = mBlend.sourceBlendRGB;
            break;
        case GL_BLEND_SRC_ALPHA:
            *params = mBlend.sourceBlendAlpha;
            break;
        case GL_BLEND_DST_RGB:
            *params = mBlend.destBlendRGB;
            break;
        case GL_BLEND_DST_ALPHA:
            *params = mBlend.destBlendAlpha;
            break;
        case GL_BLEND_EQUATION_RGB:
            *params = mBlend.blendEquationRGB;
            break;
        case GL_BLEND_EQUATION_ALPHA:
            *params = mBlend.blendEquationAlpha;
            break;
        case GL_STENCIL_WRITEMASK:
            *params = CastMaskValue(context, mDepthStencil.stencilWritemask);
            break;
        case GL_STENCIL_BACK_WRITEMASK:
            *params = CastMaskValue(context, mDepthStencil.stencilBackWritemask);
            break;
        case GL_STENCIL_CLEAR_VALUE:
            *params = mStencilClearValue;
            break;
        case GL_IMPLEMENTATION_COLOR_READ_TYPE:
            ANGLE_TRY(mReadFramebuffer->getImplementationColorReadType(
                context, reinterpret_cast<GLenum *>(params)));
            break;
        case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
            ANGLE_TRY(mReadFramebuffer->getImplementationColorReadFormat(
                context, reinterpret_cast<GLenum *>(params)));
            break;
        case GL_SAMPLE_BUFFERS:
        case GL_SAMPLES:
        {
            Framebuffer *framebuffer = mDrawFramebuffer;
            if (framebuffer->isComplete(context))
            {
                GLint samples = framebuffer->getSamples(context);
                switch (pname)
                {
                    case GL_SAMPLE_BUFFERS:
                        if (samples != 0)
                        {
                            *params = 1;
                        }
                        else
                        {
                            *params = 0;
                        }
                        break;
                    case GL_SAMPLES:
                        *params = samples;
                        break;
                }
            }
            else
            {
                *params = 0;
            }
        }
        break;
        case GL_VIEWPORT:
            params[0] = mViewport.x;
            params[1] = mViewport.y;
            params[2] = mViewport.width;
            params[3] = mViewport.height;
            break;
        case GL_SCISSOR_BOX:
            params[0] = mScissor.x;
            params[1] = mScissor.y;
            params[2] = mScissor.width;
            params[3] = mScissor.height;
            break;
        case GL_CULL_FACE_MODE:
            *params = ToGLenum(mRasterizer.cullMode);
            break;
        case GL_FRONT_FACE:
            *params = mRasterizer.frontFace;
            break;
        case GL_RED_BITS:
        case GL_GREEN_BITS:
        case GL_BLUE_BITS:
        case GL_ALPHA_BITS:
        {
            Framebuffer *framebuffer                 = getDrawFramebuffer();
            const FramebufferAttachment *colorbuffer = framebuffer->getFirstColorbuffer();

            if (colorbuffer)
            {
                switch (pname)
                {
                    case GL_RED_BITS:
                        *params = colorbuffer->getRedSize();
                        break;
                    case GL_GREEN_BITS:
                        *params = colorbuffer->getGreenSize();
                        break;
                    case GL_BLUE_BITS:
                        *params = colorbuffer->getBlueSize();
                        break;
                    case GL_ALPHA_BITS:
                        *params = colorbuffer->getAlphaSize();
                        break;
                }
            }
            else
            {
                *params = 0;
            }
        }
        break;
        case GL_DEPTH_BITS:
        {
            const Framebuffer *framebuffer           = getDrawFramebuffer();
            const FramebufferAttachment *depthbuffer = framebuffer->getDepthbuffer();

            if (depthbuffer)
            {
                *params = depthbuffer->getDepthSize();
            }
            else
            {
                *params = 0;
            }
        }
        break;
        case GL_STENCIL_BITS:
        {
            const Framebuffer *framebuffer             = getDrawFramebuffer();
            const FramebufferAttachment *stencilbuffer = framebuffer->getStencilbuffer();

            if (stencilbuffer)
            {
                *params = stencilbuffer->getStencilSize();
            }
            else
            {
                *params = 0;
            }
        }
        break;
        case GL_TEXTURE_BINDING_2D:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params =
                getSamplerTextureId(static_cast<unsigned int>(mActiveSampler), TextureType::_2D);
            break;
        case GL_TEXTURE_BINDING_RECTANGLE_ANGLE:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params = getSamplerTextureId(static_cast<unsigned int>(mActiveSampler),
                                          TextureType::Rectangle);
            break;
        case GL_TEXTURE_BINDING_CUBE_MAP:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params = getSamplerTextureId(static_cast<unsigned int>(mActiveSampler),
                                          TextureType::CubeMap);
            break;
        case GL_TEXTURE_BINDING_3D:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params =
                getSamplerTextureId(static_cast<unsigned int>(mActiveSampler), TextureType::_3D);
            break;
        case GL_TEXTURE_BINDING_2D_ARRAY:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params = getSamplerTextureId(static_cast<unsigned int>(mActiveSampler),
                                          TextureType::_2DArray);
            break;
        case GL_TEXTURE_BINDING_2D_MULTISAMPLE:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params = getSamplerTextureId(static_cast<unsigned int>(mActiveSampler),
                                          TextureType::_2DMultisample);
            break;
        case GL_TEXTURE_BINDING_2D_MULTISAMPLE_ARRAY:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params = getSamplerTextureId(static_cast<unsigned int>(mActiveSampler),
                                          TextureType::_2DMultisampleArray);
            break;
        case GL_TEXTURE_BINDING_EXTERNAL_OES:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params = getSamplerTextureId(static_cast<unsigned int>(mActiveSampler),
                                          TextureType::External);
            break;
        case GL_UNIFORM_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::Uniform].id();
            break;
        case GL_TRANSFORM_FEEDBACK_BINDING:
            *params = mTransformFeedback.id();
            break;
        case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::TransformFeedback].id();
            break;
        case GL_COPY_READ_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::CopyRead].id();
            break;
        case GL_COPY_WRITE_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::CopyWrite].id();
            break;
        case GL_PIXEL_PACK_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::PixelPack].id();
            break;
        case GL_PIXEL_UNPACK_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::PixelUnpack].id();
            break;
        case GL_READ_BUFFER:
            *params = mReadFramebuffer->getReadBufferState();
            break;
        case GL_SAMPLER_BINDING:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params = getSamplerId(static_cast<GLuint>(mActiveSampler));
            break;
        case GL_DEBUG_LOGGED_MESSAGES:
            *params = static_cast<GLint>(mDebug.getMessageCount());
            break;
        case GL_DEBUG_NEXT_LOGGED_MESSAGE_LENGTH:
            *params = static_cast<GLint>(mDebug.getNextMessageLength());
            break;
        case GL_DEBUG_GROUP_STACK_DEPTH:
            *params = static_cast<GLint>(mDebug.getGroupStackDepth());
            break;
        case GL_MULTISAMPLE_EXT:
            *params = static_cast<GLint>(mMultiSampling);
            break;
        case GL_SAMPLE_ALPHA_TO_ONE_EXT:
            *params = static_cast<GLint>(mSampleAlphaToOne);
            break;
        case GL_COVERAGE_MODULATION_CHROMIUM:
            *params = static_cast<GLint>(mCoverageModulation);
            break;
        case GL_ATOMIC_COUNTER_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::AtomicCounter].id();
            break;
        case GL_SHADER_STORAGE_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::ShaderStorage].id();
            break;
        case GL_DISPATCH_INDIRECT_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::DispatchIndirect].id();
            break;
        case GL_ALPHA_TEST_FUNC:
            *params = ToGLenum(mGLES1State.mAlphaTestFunc);
            break;
        case GL_CLIENT_ACTIVE_TEXTURE:
            *params = mGLES1State.mClientActiveTexture + GL_TEXTURE0;
            break;
        case GL_MATRIX_MODE:
            *params = ToGLenum(mGLES1State.mMatrixMode);
            break;
        case GL_SHADE_MODEL:
            *params = ToGLenum(mGLES1State.mShadeModel);
            break;
        case GL_MODELVIEW_STACK_DEPTH:
        case GL_PROJECTION_STACK_DEPTH:
        case GL_TEXTURE_STACK_DEPTH:
            *params = mGLES1State.getCurrentMatrixStackDepth(pname);
            break;
        case GL_LOGIC_OP_MODE:
            *params = ToGLenum(mGLES1State.mLogicOp);
            break;
        case GL_BLEND_SRC:
            *params = mBlend.sourceBlendRGB;
            break;
        case GL_BLEND_DST:
            *params = mBlend.destBlendRGB;
            break;
        case GL_PERSPECTIVE_CORRECTION_HINT:
        case GL_POINT_SMOOTH_HINT:
        case GL_LINE_SMOOTH_HINT:
        case GL_FOG_HINT:
            *params = mGLES1State.getHint(pname);
            break;
        default:
            UNREACHABLE();
            break;
    }

    return NoError();
}

void State::getPointerv(const Context *context, GLenum pname, void **params) const
{
    switch (pname)
    {
        case GL_DEBUG_CALLBACK_FUNCTION:
            *params = reinterpret_cast<void *>(mDebug.getCallback());
            break;
        case GL_DEBUG_CALLBACK_USER_PARAM:
            *params = const_cast<void *>(mDebug.getUserParam());
            break;
        case GL_VERTEX_ARRAY_POINTER:
        case GL_NORMAL_ARRAY_POINTER:
        case GL_COLOR_ARRAY_POINTER:
        case GL_TEXTURE_COORD_ARRAY_POINTER:
        case GL_POINT_SIZE_ARRAY_POINTER_OES:
            QueryVertexAttribPointerv(getVertexArray()->getVertexAttribute(
                                          context->vertexArrayIndex(ParamToVertexArrayType(pname))),
                                      GL_VERTEX_ATTRIB_ARRAY_POINTER, params);
            return;
        default:
            UNREACHABLE();
            break;
    }
}

void State::getIntegeri_v(GLenum target, GLuint index, GLint *data)
{
    switch (target)
    {
        case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING:
            ASSERT(static_cast<size_t>(index) < mTransformFeedback->getIndexedBufferCount());
            *data = mTransformFeedback->getIndexedBuffer(index).id();
            break;
        case GL_UNIFORM_BUFFER_BINDING:
            ASSERT(static_cast<size_t>(index) < mUniformBuffers.size());
            *data = mUniformBuffers[index].id();
            break;
        case GL_ATOMIC_COUNTER_BUFFER_BINDING:
            ASSERT(static_cast<size_t>(index) < mAtomicCounterBuffers.size());
            *data = mAtomicCounterBuffers[index].id();
            break;
        case GL_SHADER_STORAGE_BUFFER_BINDING:
            ASSERT(static_cast<size_t>(index) < mShaderStorageBuffers.size());
            *data = mShaderStorageBuffers[index].id();
            break;
        case GL_VERTEX_BINDING_BUFFER:
            ASSERT(static_cast<size_t>(index) < mVertexArray->getMaxBindings());
            *data = mVertexArray->getVertexBinding(index).getBuffer().id();
            break;
        case GL_VERTEX_BINDING_DIVISOR:
            ASSERT(static_cast<size_t>(index) < mVertexArray->getMaxBindings());
            *data = mVertexArray->getVertexBinding(index).getDivisor();
            break;
        case GL_VERTEX_BINDING_OFFSET:
            ASSERT(static_cast<size_t>(index) < mVertexArray->getMaxBindings());
            *data = static_cast<GLuint>(mVertexArray->getVertexBinding(index).getOffset());
            break;
        case GL_VERTEX_BINDING_STRIDE:
            ASSERT(static_cast<size_t>(index) < mVertexArray->getMaxBindings());
            *data = mVertexArray->getVertexBinding(index).getStride();
            break;
        case GL_SAMPLE_MASK_VALUE:
            ASSERT(static_cast<size_t>(index) < mSampleMaskValues.size());
            *data = mSampleMaskValues[index];
            break;
        case GL_IMAGE_BINDING_NAME:
            ASSERT(static_cast<size_t>(index) < mImageUnits.size());
            *data = mImageUnits[index].texture.id();
            break;
        case GL_IMAGE_BINDING_LEVEL:
            ASSERT(static_cast<size_t>(index) < mImageUnits.size());
            *data = mImageUnits[index].level;
            break;
        case GL_IMAGE_BINDING_LAYER:
            ASSERT(static_cast<size_t>(index) < mImageUnits.size());
            *data = mImageUnits[index].layer;
            break;
        case GL_IMAGE_BINDING_ACCESS:
            ASSERT(static_cast<size_t>(index) < mImageUnits.size());
            *data = mImageUnits[index].access;
            break;
        case GL_IMAGE_BINDING_FORMAT:
            ASSERT(static_cast<size_t>(index) < mImageUnits.size());
            *data = mImageUnits[index].format;
            break;
        default:
            UNREACHABLE();
            break;
    }
}

void State::getInteger64i_v(GLenum target, GLuint index, GLint64 *data)
{
    switch (target)
    {
        case GL_TRANSFORM_FEEDBACK_BUFFER_START:
            ASSERT(static_cast<size_t>(index) < mTransformFeedback->getIndexedBufferCount());
            *data = mTransformFeedback->getIndexedBuffer(index).getOffset();
            break;
        case GL_TRANSFORM_FEEDBACK_BUFFER_SIZE:
            ASSERT(static_cast<size_t>(index) < mTransformFeedback->getIndexedBufferCount());
            *data = mTransformFeedback->getIndexedBuffer(index).getSize();
            break;
        case GL_UNIFORM_BUFFER_START:
            ASSERT(static_cast<size_t>(index) < mUniformBuffers.size());
            *data = mUniformBuffers[index].getOffset();
            break;
        case GL_UNIFORM_BUFFER_SIZE:
            ASSERT(static_cast<size_t>(index) < mUniformBuffers.size());
            *data = mUniformBuffers[index].getSize();
            break;
        case GL_ATOMIC_COUNTER_BUFFER_START:
            ASSERT(static_cast<size_t>(index) < mAtomicCounterBuffers.size());
            *data = mAtomicCounterBuffers[index].getOffset();
            break;
        case GL_ATOMIC_COUNTER_BUFFER_SIZE:
            ASSERT(static_cast<size_t>(index) < mAtomicCounterBuffers.size());
            *data = mAtomicCounterBuffers[index].getSize();
            break;
        case GL_SHADER_STORAGE_BUFFER_START:
            ASSERT(static_cast<size_t>(index) < mShaderStorageBuffers.size());
            *data = mShaderStorageBuffers[index].getOffset();
            break;
        case GL_SHADER_STORAGE_BUFFER_SIZE:
            ASSERT(static_cast<size_t>(index) < mShaderStorageBuffers.size());
            *data = mShaderStorageBuffers[index].getSize();
            break;
        default:
            UNREACHABLE();
            break;
    }
}

void State::getBooleani_v(GLenum target, GLuint index, GLboolean *data)
{
    switch (target)
    {
        case GL_IMAGE_BINDING_LAYERED:
            ASSERT(static_cast<size_t>(index) < mImageUnits.size());
            *data = mImageUnits[index].layered;
            break;
        default:
            UNREACHABLE();
            break;
    }
}

Error State::syncDirtyObjects(const Context *context, const DirtyObjects &bitset)
{
    const DirtyObjects &dirtyObjects = mDirtyObjects & bitset;
    for (auto dirtyObject : dirtyObjects)
    {
        switch (dirtyObject)
        {
            case DIRTY_OBJECT_READ_FRAMEBUFFER:
                ASSERT(mReadFramebuffer);
                ANGLE_TRY(mReadFramebuffer->syncState(context));
                break;
            case DIRTY_OBJECT_DRAW_FRAMEBUFFER:
                ASSERT(mDrawFramebuffer);
                ANGLE_TRY(mDrawFramebuffer->syncState(context));
                break;
            case DIRTY_OBJECT_VERTEX_ARRAY:
                ASSERT(mVertexArray);
                ANGLE_TRY(mVertexArray->syncState(context));
                break;
            case DIRTY_OBJECT_SAMPLERS:
                syncSamplers(context);
                break;
            case DIRTY_OBJECT_PROGRAM_TEXTURES:
                ANGLE_TRY(syncProgramTextures(context));
                break;
            case DIRTY_OBJECT_PROGRAM:
                ANGLE_TRY(mProgram->syncState(context));
                break;

            default:
                UNREACHABLE();
                break;
        }
    }

    mDirtyObjects &= ~dirtyObjects;
    return NoError();
}

void State::syncSamplers(const Context *context)
{
    if (mDirtySamplers.none())
        return;

    // This could be optimized by tracking which samplers are dirty.
    for (size_t samplerIndex : mDirtySamplers)
    {
        BindingPointer<Sampler> &sampler = mSamplers[samplerIndex];
        if (sampler.get())
        {
            sampler->syncState(context);
        }
    }

    mDirtySamplers.reset();
}

Error State::syncProgramTextures(const Context *context)
{
    // TODO(jmadill): Fine-grained updates.
    if (!mProgram)
    {
        return NoError();
    }

    ASSERT(mDirtyObjects[DIRTY_OBJECT_PROGRAM_TEXTURES]);
    mDirtyBits.set(DIRTY_BIT_TEXTURE_BINDINGS);

    ActiveTextureMask newActiveTextures;

    // Initialize to the 'Initialized' state and set to 'MayNeedInit' if any texture is not
    // initialized.
    mCachedTexturesInitState = InitState::Initialized;
    mCachedImageTexturesInitState = InitState::Initialized;

    const ActiveTextureMask &activeTextures             = mProgram->getActiveSamplersMask();
    const ActiveTextureArray<TextureType> &textureTypes = mProgram->getActiveSamplerTypes();

    for (size_t textureUnitIndex : activeTextures)
    {
        TextureType textureType = textureTypes[textureUnitIndex];

        Texture *texture =
            getSamplerTexture(static_cast<unsigned int>(textureUnitIndex), textureType);
        Sampler *sampler = getSampler(static_cast<GLuint>(textureUnitIndex));
        ASSERT(static_cast<size_t>(textureUnitIndex) < mActiveTexturesCache.size());
        ASSERT(static_cast<size_t>(textureUnitIndex) < newActiveTextures.size());

        ASSERT(texture);

        // Mark the texture binding bit as dirty if the texture completeness changes.
        // TODO(jmadill): Use specific dirty bit for completeness change.
        if (texture->isSamplerComplete(context, sampler) &&
            (mProgram->hasLinkedShaderStage(ShaderType::Compute) ||
             !mDrawFramebuffer->hasTextureAttachment(texture)))
        {
            ANGLE_TRY(texture->syncState(context));
            mActiveTexturesCache[textureUnitIndex] = texture;
        }
        else
        {
            mActiveTexturesCache[textureUnitIndex] = nullptr;
        }

        // Bind the texture unconditionally, to recieve completeness change notifications.
        mCompleteTextureBindings[textureUnitIndex].bind(texture->getSubject());
        newActiveTextures.set(textureUnitIndex);

        if (texture->initState() == InitState::MayNeedInit)
        {
            mCachedTexturesInitState = InitState::MayNeedInit;
        }
    }

    // Unset now missing textures.
    ActiveTextureMask negativeMask = activeTextures & ~newActiveTextures;
    if (negativeMask.any())
    {
        for (auto textureIndex : negativeMask)
        {
            mCompleteTextureBindings[textureIndex].reset();
            mActiveTexturesCache[textureIndex] = nullptr;
        }
    }

    for (size_t imageUnitIndex : mProgram->getActiveImagesMask())
    {
        Texture *texture = mImageUnits[imageUnitIndex].texture.get();
        if (!texture)
        {
            continue;
        }
        if (!mDrawFramebuffer->hasTextureAttachment(texture))
        {
            ANGLE_TRY(texture->syncState(context));
        }
        if (texture->initState() == InitState::MayNeedInit)
        {
            mCachedImageTexturesInitState = InitState::MayNeedInit;
        }
    }

    return NoError();
}

Error State::syncDirtyObject(const Context *context, GLenum target)
{
    DirtyObjects localSet;

    switch (target)
    {
        case GL_READ_FRAMEBUFFER:
            localSet.set(DIRTY_OBJECT_READ_FRAMEBUFFER);
            break;
        case GL_DRAW_FRAMEBUFFER:
            localSet.set(DIRTY_OBJECT_DRAW_FRAMEBUFFER);
            break;
        case GL_FRAMEBUFFER:
            localSet.set(DIRTY_OBJECT_READ_FRAMEBUFFER);
            localSet.set(DIRTY_OBJECT_DRAW_FRAMEBUFFER);
            break;
        case GL_VERTEX_ARRAY:
            localSet.set(DIRTY_OBJECT_VERTEX_ARRAY);
            break;
        case GL_TEXTURE:
            localSet.set(DIRTY_OBJECT_PROGRAM_TEXTURES);
            break;
        case GL_SAMPLER:
            localSet.set(DIRTY_OBJECT_PROGRAM_TEXTURES);
            localSet.set(DIRTY_OBJECT_SAMPLERS);
            break;
        case GL_PROGRAM:
            localSet.set(DIRTY_OBJECT_PROGRAM_TEXTURES);
            localSet.set(DIRTY_OBJECT_PROGRAM);
            break;
    }

    return syncDirtyObjects(context, localSet);
}

void State::setObjectDirty(GLenum target)
{
    switch (target)
    {
        case GL_READ_FRAMEBUFFER:
            mDirtyObjects.set(DIRTY_OBJECT_READ_FRAMEBUFFER);
            break;
        case GL_DRAW_FRAMEBUFFER:
            mDirtyObjects.set(DIRTY_OBJECT_DRAW_FRAMEBUFFER);
            break;
        case GL_FRAMEBUFFER:
            mDirtyObjects.set(DIRTY_OBJECT_READ_FRAMEBUFFER);
            mDirtyObjects.set(DIRTY_OBJECT_DRAW_FRAMEBUFFER);
            break;
        case GL_VERTEX_ARRAY:
            mDirtyObjects.set(DIRTY_OBJECT_VERTEX_ARRAY);
            break;
        case GL_TEXTURE:
            mDirtyObjects.set(DIRTY_OBJECT_PROGRAM_TEXTURES);
            mDirtyBits.set(DIRTY_BIT_TEXTURE_BINDINGS);
            break;
        case GL_PROGRAM:
            mDirtyObjects.set(DIRTY_OBJECT_PROGRAM_TEXTURES);
            mDirtyObjects.set(DIRTY_OBJECT_PROGRAM);
            mDirtyBits.set(DIRTY_BIT_TEXTURE_BINDINGS);
            break;
    }
}

void State::onProgramExecutableChange(Program *program)
{
    // OpenGL Spec:
    // "If LinkProgram or ProgramBinary successfully re-links a program object
    //  that was already in use as a result of a previous call to UseProgram, then the
    //  generated executable code will be installed as part of the current rendering state."
    if (program->isLinked() && mProgram == program)
    {
        mDirtyBits.set(DIRTY_BIT_PROGRAM_EXECUTABLE);
        mDirtyObjects.set(DIRTY_OBJECT_PROGRAM_TEXTURES);
        mDirtyObjects.set(DIRTY_OBJECT_PROGRAM);
    }
}

void State::setSamplerDirty(size_t samplerIndex)
{
    mDirtyObjects.set(DIRTY_OBJECT_SAMPLERS);
    mDirtySamplers.set(samplerIndex);
}

void State::setImageUnit(const Context *context,
                         size_t unit,
                         Texture *texture,
                         GLint level,
                         GLboolean layered,
                         GLint layer,
                         GLenum access,
                         GLenum format)
{
    mImageUnits[unit].texture.set(context, texture);
    mImageUnits[unit].level   = level;
    mImageUnits[unit].layered = layered;
    mImageUnits[unit].layer   = layer;
    mImageUnits[unit].access  = access;
    mImageUnits[unit].format  = format;
    mDirtyBits.set(DIRTY_BIT_IMAGE_BINDINGS);
}

const ImageUnit &State::getImageUnit(size_t unit) const
{
    return mImageUnits[unit];
}

// Handle a dirty texture event.
void State::onActiveTextureStateChange(size_t textureIndex)
{
    // Conservatively assume all textures are dirty.
    // TODO(jmadill): More fine-grained update.
    mDirtyObjects.set(DIRTY_OBJECT_PROGRAM_TEXTURES);

    if (!mActiveTexturesCache[textureIndex] ||
        mActiveTexturesCache[textureIndex]->initState() == InitState::MayNeedInit)
    {
        mCachedTexturesInitState = InitState::MayNeedInit;
    }
}

void State::onUniformBufferStateChange(size_t uniformBufferIndex)
{
    // This could be represented by a different dirty bit. Using the same one keeps it simple.
    mDirtyBits.set(DIRTY_BIT_UNIFORM_BUFFER_BINDINGS);
}

Error State::clearUnclearedActiveTextures(const Context *context)
{
    ASSERT(mRobustResourceInit);
    ASSERT(!mDirtyObjects[DIRTY_OBJECT_PROGRAM_TEXTURES]);

    if (!mProgram)
        return NoError();

    if (mCachedTexturesInitState != InitState::Initialized)
    {
        for (size_t textureUnitIndex : mProgram->getActiveSamplersMask())
        {
            Texture *texture = mActiveTexturesCache[textureUnitIndex];
            if (texture)
            {
                ANGLE_TRY(texture->ensureInitialized(context));
            }
        }
        mCachedTexturesInitState = InitState::Initialized;
    }
    if (mCachedImageTexturesInitState != InitState::Initialized)
    {
        for (size_t imageUnitIndex : mProgram->getActiveImagesMask())
        {
            Texture *texture = mImageUnits[imageUnitIndex].texture.get();
            if (texture)
            {
                ANGLE_TRY(texture->ensureInitialized(context));
            }
        }
        mCachedImageTexturesInitState = InitState::Initialized;
    }
    return NoError();
}

AttributesMask State::getAndResetDirtyCurrentValues() const
{
    AttributesMask retVal = mDirtyCurrentValues;
    mDirtyCurrentValues.reset();
    return retVal;
}

bool State::isCurrentTransformFeedback(const TransformFeedback *tf) const
{
    return tf == mTransformFeedback.get();
}
}  // namespace gl