//
// Copyright 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.

// Older clang versions have a false positive on this warning here.
#pragma clang diagnostic ignored "-Wglobal-constructors"

#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/Buffer.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"
#include "libANGLE/renderer/TextureImpl.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;
    }
}

// Mapping from a buffer binding type to a dirty bit type.
constexpr angle::PackedEnumMap<BufferBinding, size_t> kBufferBindingDirtyBits = {{
    {BufferBinding::AtomicCounter, State::DIRTY_BIT_ATOMIC_COUNTER_BUFFER_BINDING},
    {BufferBinding::DispatchIndirect, State::DIRTY_BIT_DISPATCH_INDIRECT_BUFFER_BINDING},
    {BufferBinding::DrawIndirect, State::DIRTY_BIT_DRAW_INDIRECT_BUFFER_BINDING},
    {BufferBinding::PixelPack, State::DIRTY_BIT_PACK_BUFFER_BINDING},
    {BufferBinding::PixelUnpack, State::DIRTY_BIT_UNPACK_BUFFER_BINDING},
    {BufferBinding::ShaderStorage, State::DIRTY_BIT_SHADER_STORAGE_BUFFER_BINDING},
    {BufferBinding::Uniform, State::DIRTY_BIT_UNIFORM_BUFFER_BINDINGS},
}};

// Returns a buffer binding function depending on if a dirty bit is set.
template <BufferBinding Target>
constexpr std::pair<BufferBinding, State::BufferBindingSetter> GetBufferBindingSetter()
{
    return std::make_pair(Target, kBufferBindingDirtyBits[Target] != 0
                                      ? &State::setGenericBufferBindingWithBit<Target>
                                      : &State::setGenericBufferBinding<Target>);
}

template <typename T>
using ContextStateMember = T *(State::*);

template <typename T>
T *AllocateOrGetSharedResourceManager(const State *shareContextState, ContextStateMember<T> member)
{
    if (shareContextState)
    {
        T *resourceManager = (*shareContextState).*member;
        resourceManager->addRef();
        return resourceManager;
    }
    else
    {
        return new T();
    }
}

TextureManager *AllocateOrGetSharedTextureManager(const State *shareContextState,
                                                  TextureManager *shareTextures,
                                                  ContextStateMember<TextureManager> member)
{
    if (shareContextState)
    {
        TextureManager *textureManager = (*shareContextState).*member;
        ASSERT(shareTextures == nullptr || textureManager == shareTextures);
        textureManager->addRef();
        return textureManager;
    }
    else if (shareTextures)
    {
        TextureManager *textureManager = shareTextures;
        textureManager->addRef();
        return textureManager;
    }
    else
    {
        return new TextureManager();
    }
}

// TODO(https://anglebug.com/3889): Remove this helper function after blink and chromium part
// refactory done.
bool IsTextureCompatibleWithSampler(TextureType texture, TextureType sampler)
{
    if (sampler == texture)
    {
        return true;
    }

    if (sampler == TextureType::VideoImage)
    {
        if (texture == TextureType::VideoImage || texture == TextureType::_2D)
        {
            return true;
        }
    }

    return false;
}

int gIDCounter = 1;
}  // namespace

template <typename BindingT, typename... ArgsT>
ANGLE_INLINE void UpdateNonTFBufferBinding(const Context *context,
                                           BindingT *binding,
                                           Buffer *buffer,
                                           ArgsT... args)
{
    Buffer *oldBuffer = binding->get();
    if (oldBuffer)
    {
        oldBuffer->onNonTFBindingChanged(-1);
        oldBuffer->release(context);
    }
    binding->assign(buffer, args...);
    if (buffer)
    {
        buffer->addRef();
        buffer->onNonTFBindingChanged(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);
    }
}

// These template functions must be defined before they are instantiated in kBufferSetters.
template <BufferBinding Target>
void State::setGenericBufferBindingWithBit(const Context *context, Buffer *buffer)
{
    UpdateNonTFBufferBinding(context, &mBoundBuffers[Target], buffer);
    mDirtyBits.set(kBufferBindingDirtyBits[Target]);
}

template <BufferBinding Target>
void State::setGenericBufferBinding(const Context *context, Buffer *buffer)
{
    UpdateNonTFBufferBinding(context, &mBoundBuffers[Target], buffer);
}

template <>
void State::setGenericBufferBinding<BufferBinding::TransformFeedback>(const Context *context,
                                                                      Buffer *buffer)
{
    UpdateTFBufferBinding(context, &mBoundBuffers[BufferBinding::TransformFeedback], false, buffer);
}

template <>
void State::setGenericBufferBinding<BufferBinding::ElementArray>(const Context *context,
                                                                 Buffer *buffer)
{
    Buffer *oldBuffer = mVertexArray->mState.mElementArrayBuffer.get();
    if (oldBuffer)
    {
        oldBuffer->removeObserver(&mVertexArray->mState.mElementArrayBuffer);
        oldBuffer->onNonTFBindingChanged(-1);
        oldBuffer->release(context);
    }
    mVertexArray->mState.mElementArrayBuffer.assign(buffer);
    if (buffer)
    {
        buffer->addObserver(&mVertexArray->mState.mElementArrayBuffer);
        buffer->onNonTFBindingChanged(1);
        buffer->addRef();
    }
    mVertexArray->mDirtyBits.set(VertexArray::DIRTY_BIT_ELEMENT_ARRAY_BUFFER);
    mVertexArray->mIndexRangeCache.invalidate();
    mDirtyObjects.set(DIRTY_OBJECT_VERTEX_ARRAY);
}

const angle::PackedEnumMap<BufferBinding, State::BufferBindingSetter> State::kBufferSetters = {{
    GetBufferBindingSetter<BufferBinding::Array>(),
    GetBufferBindingSetter<BufferBinding::AtomicCounter>(),
    GetBufferBindingSetter<BufferBinding::CopyRead>(),
    GetBufferBindingSetter<BufferBinding::CopyWrite>(),
    GetBufferBindingSetter<BufferBinding::DispatchIndirect>(),
    GetBufferBindingSetter<BufferBinding::DrawIndirect>(),
    GetBufferBindingSetter<BufferBinding::ElementArray>(),
    GetBufferBindingSetter<BufferBinding::PixelPack>(),
    GetBufferBindingSetter<BufferBinding::PixelUnpack>(),
    GetBufferBindingSetter<BufferBinding::ShaderStorage>(),
    GetBufferBindingSetter<BufferBinding::TransformFeedback>(),
    GetBufferBindingSetter<BufferBinding::Uniform>(),
}};

ActiveTexturesCache::ActiveTexturesCache() : mTextures{} {}

ActiveTexturesCache::~ActiveTexturesCache()
{
    ASSERT(empty());
}

void ActiveTexturesCache::clear(ContextID contextID)
{
    for (size_t textureIndex = 0; textureIndex < mTextures.size(); ++textureIndex)
    {
        reset(contextID, textureIndex);
    }
}

bool ActiveTexturesCache::empty() const
{
    for (Texture *texture : mTextures)
    {
        if (texture)
        {
            return false;
        }
    }

    return true;
}

ANGLE_INLINE void ActiveTexturesCache::reset(ContextID contextID, size_t textureIndex)
{
    if (mTextures[textureIndex])
    {
        mTextures[textureIndex]->onUnbindAsSamplerTexture(contextID);
        mTextures[textureIndex] = nullptr;
    }
}

ANGLE_INLINE void ActiveTexturesCache::set(ContextID contextID,
                                           size_t textureIndex,
                                           Texture *texture)
{
    // We don't call reset() here to avoid setting nullptr before rebind.
    if (mTextures[textureIndex])
    {
        mTextures[textureIndex]->onUnbindAsSamplerTexture(contextID);
    }

    ASSERT(texture);
    texture->onBindAsSamplerTexture(contextID);
    mTextures[textureIndex] = texture;
}

State::State(const State *shareContextState,
             egl::ShareGroup *shareGroup,
             TextureManager *shareTextures,
             const OverlayType *overlay,
             const EGLenum clientType,
             const Version &clientVersion,
             bool debug,
             bool bindGeneratesResource,
             bool clientArraysEnabled,
             bool robustResourceInit,
             bool programBinaryCacheEnabled,
             EGLenum contextPriority)
    : mID(gIDCounter++),
      mClientType(clientType),
      mContextPriority(contextPriority),
      mClientVersion(clientVersion),
      mShareGroup(shareGroup),
      mBufferManager(AllocateOrGetSharedResourceManager(shareContextState, &State::mBufferManager)),
      mShaderProgramManager(
          AllocateOrGetSharedResourceManager(shareContextState, &State::mShaderProgramManager)),
      mTextureManager(AllocateOrGetSharedTextureManager(shareContextState,
                                                        shareTextures,
                                                        &State::mTextureManager)),
      mRenderbufferManager(
          AllocateOrGetSharedResourceManager(shareContextState, &State::mRenderbufferManager)),
      mSamplerManager(
          AllocateOrGetSharedResourceManager(shareContextState, &State::mSamplerManager)),
      mSyncManager(AllocateOrGetSharedResourceManager(shareContextState, &State::mSyncManager)),
      mFramebufferManager(new FramebufferManager()),
      mProgramPipelineManager(new ProgramPipelineManager()),
      mMemoryObjectManager(
          AllocateOrGetSharedResourceManager(shareContextState, &State::mMemoryObjectManager)),
      mSemaphoreManager(
          AllocateOrGetSharedResourceManager(shareContextState, &State::mSemaphoreManager)),
      mMaxDrawBuffers(0),
      mMaxCombinedTextureImageUnits(0),
      mDepthClearValue(0),
      mStencilClearValue(0),
      mScissorTest(false),
      mSampleAlphaToCoverage(false),
      mSampleCoverage(false),
      mSampleCoverageValue(0),
      mSampleCoverageInvert(false),
      mSampleMask(false),
      mMaxSampleMaskWords(0),
      mStencilRef(0),
      mStencilBackRef(0),
      mLineWidth(0),
      mGenerateMipmapHint(GL_NONE),
      mTextureFilteringHint(GL_NONE),
      mFragmentShaderDerivativeHint(GL_NONE),
      mBindGeneratesResource(bindGeneratesResource),
      mClientArraysEnabled(clientArraysEnabled),
      mNearZ(0),
      mFarZ(0),
      mReadFramebuffer(nullptr),
      mDrawFramebuffer(nullptr),
      mProgram(nullptr),
      mExecutable(nullptr),
      mProvokingVertex(gl::ProvokingVertexConvention::LastVertexConvention),
      mVertexArray(nullptr),
      mActiveSampler(0),
      mTexturesIncompatibleWithSamplers(0),
      mPrimitiveRestart(false),
      mDebug(debug),
      mMultiSampling(false),
      mSampleAlphaToOne(false),
      mFramebufferSRGB(true),
      mRobustResourceInit(robustResourceInit),
      mProgramBinaryCacheEnabled(programBinaryCacheEnabled),
      mTextureRectangleEnabled(true),
      mMaxShaderCompilerThreads(std::numeric_limits<GLuint>::max()),
      mOverlay(overlay),
      mNoSimultaneousConstantColorAndAlphaBlendFunc(false)
{}

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               = static_cast<GLuint>(caps.maxDrawBuffers);
    mBlendStateExt                = BlendStateExt(mMaxDrawBuffers);
    mMaxCombinedTextureImageUnits = static_cast<GLuint>(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 = static_cast<GLuint>(caps.maxSampleMaskWords);
    mSampleMask         = false;
    mSampleMaskValues.fill(~GLbitfield(0));

    mGenerateMipmapHint           = GL_DONT_CARE;
    mTextureFilteringHint         = 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;

    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++)
    {
        SetComponentTypeMask(ComponentType::Float, i, &mCurrentValuesTypeMask);
    }

    mUniformBuffers.resize(caps.maxUniformBufferBindings);

    mSamplerTextures[TextureType::_2D].resize(caps.maxCombinedTextureImageUnits);
    mSamplerTextures[TextureType::CubeMap].resize(caps.maxCombinedTextureImageUnits);
    if (clientVersion >= Version(3, 0) || nativeExtensions.texture3DOES)
    {
        mSamplerTextures[TextureType::_3D].resize(caps.maxCombinedTextureImageUnits);
    }
    if (clientVersion >= Version(3, 0))
    {
        mSamplerTextures[TextureType::_2DArray].resize(caps.maxCombinedTextureImageUnits);
    }
    if (clientVersion >= Version(3, 1) || nativeExtensions.textureMultisample)
    {
        mSamplerTextures[TextureType::_2DMultisample].resize(caps.maxCombinedTextureImageUnits);
    }
    if (clientVersion >= Version(3, 1))
    {
        mSamplerTextures[TextureType::_2DMultisampleArray].resize(
            caps.maxCombinedTextureImageUnits);

        mAtomicCounterBuffers.resize(caps.maxAtomicCounterBufferBindings);
        mShaderStorageBuffers.resize(caps.maxShaderStorageBufferBindings);
        mImageUnits.resize(caps.maxImageUnits);
    }
    if (extensions.textureCubeMapArrayAny())
    {
        mSamplerTextures[TextureType::CubeMapArray].resize(caps.maxCombinedTextureImageUnits);
    }
    if (nativeExtensions.textureRectangle)
    {
        mSamplerTextures[TextureType::Rectangle].resize(caps.maxCombinedTextureImageUnits);
    }
    if (nativeExtensions.eglImageExternalOES || nativeExtensions.eglStreamConsumerExternalNV)
    {
        mSamplerTextures[TextureType::External].resize(caps.maxCombinedTextureImageUnits);
    }
    if (nativeExtensions.webglVideoTexture)
    {
        mSamplerTextures[TextureType::VideoImage].resize(caps.maxCombinedTextureImageUnits);
    }
    mCompleteTextureBindings.reserve(caps.maxCombinedTextureImageUnits);
    for (int32_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;
    mExecutable = nullptr;

    mReadFramebuffer = nullptr;
    mDrawFramebuffer = nullptr;

    mPrimitiveRestart = false;

    mDebug.setMaxLoggedMessages(extensions.maxDebugLoggedMessages);

    mMultiSampling    = true;
    mSampleAlphaToOne = false;

    mCoverageModulation = GL_NONE;

    mNoSimultaneousConstantColorAndAlphaBlendFunc =
        context->getLimitations().noSimultaneousConstantColorAndAlphaBlendFunc ||
        context->getExtensions().webglCompatibility;

    // GLES1 emulation: Initialize state for GLES1 if version applies
    // TODO(http://anglebug.com/3745): When on desktop client only do this in compatibility profile
    if (clientVersion < Version(2, 0) || mClientType == EGL_OPENGL_API)
    {
        mGLES1State.initialize(context, this);
    }
}

void State::reset(const Context *context)
{
    mActiveTexturesCache.clear(mID);

    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);
    mExecutable = 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);
    }

    mClipDistancesEnabled.reset();

    setAllDirtyBits();
}

ANGLE_INLINE void State::unsetActiveTextures(ActiveTextureMask textureMask)
{
    // Unset any relevant bound textures.
    for (size_t textureIndex : textureMask)
    {
        mActiveTexturesCache.reset(mID, textureIndex);
        mCompleteTextureBindings[textureIndex].reset();
    }
}

ANGLE_INLINE void State::updateActiveTextureState(const Context *context,
                                                  size_t textureIndex,
                                                  const Sampler *sampler,
                                                  Texture *texture)
{
    if (!texture || !texture->isSamplerComplete(context, sampler))
    {
        mActiveTexturesCache.reset(mID, textureIndex);
    }
    else
    {
        mActiveTexturesCache.set(mID, textureIndex, texture);

        if (texture->hasAnyDirtyBit())
        {
            setTextureDirty(textureIndex);
        }

        if (mRobustResourceInit && texture->initState() == InitState::MayNeedInit)
        {
            mDirtyObjects.set(DIRTY_OBJECT_TEXTURES_INIT);
        }
    }

    if (texture && mExecutable)
    {
        const SamplerState &samplerState =
            sampler ? sampler->getSamplerState() : texture->getSamplerState();
        mTexturesIncompatibleWithSamplers[textureIndex] =
            !texture->getTextureState().compatibleWithSamplerFormat(
                mExecutable->getSamplerFormatForTextureUnitIndex(textureIndex), samplerState);
    }
    else
    {
        mTexturesIncompatibleWithSamplers[textureIndex] = false;
    }

    mDirtyBits.set(DIRTY_BIT_TEXTURE_BINDINGS);
}

ANGLE_INLINE void State::updateActiveTexture(const Context *context,
                                             size_t textureIndex,
                                             Texture *texture)
{
    const Sampler *sampler = mSamplers[textureIndex].get();

    mCompleteTextureBindings[textureIndex].bind(texture);

    if (!texture)
    {
        mActiveTexturesCache.reset(mID, textureIndex);
        mDirtyBits.set(DIRTY_BIT_TEXTURE_BINDINGS);
        return;
    }

    updateActiveTextureState(context, textureIndex, sampler, texture);
}

ANGLE_INLINE bool State::hasConstantColor(GLenum sourceRGB, GLenum destRGB) const
{
    return sourceRGB == GL_CONSTANT_COLOR || sourceRGB == GL_ONE_MINUS_CONSTANT_COLOR ||
           destRGB == GL_CONSTANT_COLOR || destRGB == GL_ONE_MINUS_CONSTANT_COLOR;
}

ANGLE_INLINE bool State::hasConstantAlpha(GLenum sourceRGB, GLenum destRGB) const
{
    return sourceRGB == GL_CONSTANT_ALPHA || sourceRGB == GL_ONE_MINUS_CONSTANT_ALPHA ||
           destRGB == GL_CONSTANT_ALPHA || destRGB == GL_ONE_MINUS_CONSTANT_ALPHA;
}

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

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)
{
    for (BlendState &blendState : mBlendStateArray)
    {
        blendState.colorMaskRed   = red;
        blendState.colorMaskGreen = green;
        blendState.colorMaskBlue  = blue;
        blendState.colorMaskAlpha = alpha;
    }

    mBlendStateExt.setColorMask(red, green, blue, alpha);
    mDirtyBits.set(DIRTY_BIT_COLOR_MASK);
}

void State::setColorMaskIndexed(bool red, bool green, bool blue, bool alpha, GLuint index)
{
    ASSERT(index < mBlendStateArray.size());
    mBlendStateArray[index].colorMaskRed   = red;
    mBlendStateArray[index].colorMaskGreen = green;
    mBlendStateArray[index].colorMaskBlue  = blue;
    mBlendStateArray[index].colorMaskAlpha = alpha;

    mBlendStateExt.setColorMaskIndexed(index, red, green, blue, alpha);
    mDirtyBits.set(DIRTY_BIT_COLOR_MASK);
}

bool State::allActiveDrawBufferChannelsMasked() const
{
    for (size_t drawBufferIndex : mDrawFramebuffer->getDrawBufferMask())
    {
        const BlendState &blendState = mBlendStateArray[drawBufferIndex];
        if (blendState.colorMaskRed || blendState.colorMaskGreen || blendState.colorMaskBlue ||
            blendState.colorMaskAlpha)
        {
            return false;
        }
    }
    return true;
}

bool State::anyActiveDrawBufferChannelMasked() const
{
    for (size_t drawBufferIndex : mDrawFramebuffer->getDrawBufferMask())
    {
        const BlendState &blendState = mBlendStateArray[drawBufferIndex];
        if (!(blendState.colorMaskRed && blendState.colorMaskGreen && blendState.colorMaskBlue &&
              blendState.colorMaskAlpha))
        {
            return true;
        }
    }
    return false;
}

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

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

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);
}

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

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

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

void State::setBlend(bool enabled)
{
    for (BlendState &blendState : mBlendStateArray)
    {
        blendState.blend = enabled;
    }
    mBlendStateExt.setEnabled(enabled);
    mDirtyBits.set(DIRTY_BIT_BLEND_ENABLED);
}

void State::setBlendIndexed(bool enabled, GLuint index)
{
    ASSERT(index < mBlendStateArray.size());
    mBlendStateArray[index].blend = enabled;
    mBlendStateExt.setEnabledIndexed(index, enabled);
    mDirtyBits.set(DIRTY_BIT_BLEND_ENABLED);
}

void State::setBlendFactors(GLenum sourceRGB, GLenum destRGB, GLenum sourceAlpha, GLenum destAlpha)
{
    for (BlendState &blendState : mBlendStateArray)
    {
        blendState.sourceBlendRGB   = sourceRGB;
        blendState.destBlendRGB     = destRGB;
        blendState.sourceBlendAlpha = sourceAlpha;
        blendState.destBlendAlpha   = destAlpha;
    }

    if (mNoSimultaneousConstantColorAndAlphaBlendFunc)
    {
        if (hasConstantColor(sourceRGB, destRGB))
        {
            mBlendFuncConstantColorDrawBuffers.set();
        }
        else
        {
            mBlendFuncConstantColorDrawBuffers.reset();
        }

        if (hasConstantAlpha(sourceRGB, destRGB))
        {
            mBlendFuncConstantAlphaDrawBuffers.set();
        }
        else
        {
            mBlendFuncConstantAlphaDrawBuffers.reset();
        }
    }

    mBlendStateExt.setFactors(sourceRGB, destRGB, sourceAlpha, destAlpha);
    mDirtyBits.set(DIRTY_BIT_BLEND_FUNCS);
}

void State::setBlendFactorsIndexed(GLenum sourceRGB,
                                   GLenum destRGB,
                                   GLenum sourceAlpha,
                                   GLenum destAlpha,
                                   GLuint index)
{
    ASSERT(index < mBlendStateArray.size());
    mBlendStateArray[index].sourceBlendRGB   = sourceRGB;
    mBlendStateArray[index].destBlendRGB     = destRGB;
    mBlendStateArray[index].sourceBlendAlpha = sourceAlpha;
    mBlendStateArray[index].destBlendAlpha   = destAlpha;

    if (mNoSimultaneousConstantColorAndAlphaBlendFunc)
    {
        mBlendFuncConstantColorDrawBuffers.set(index, hasConstantColor(sourceRGB, destRGB));
        mBlendFuncConstantAlphaDrawBuffers.set(index, hasConstantAlpha(sourceRGB, destRGB));
    }

    mBlendStateExt.setFactorsIndexed(index, sourceRGB, destRGB, sourceAlpha, destAlpha);
    mDirtyBits.set(DIRTY_BIT_BLEND_FUNCS);
}

void State::setBlendColor(float red, float green, float blue, float alpha)
{
    // In ES2 without render-to-float extensions, BlendColor clamps to [0,1] on store.
    // On ES3+, or with render-to-float exts enabled, it does not clamp on store.
    const bool isES2 = mClientVersion.major == 2;
    const bool hasFloatBlending =
        mExtensions.colorBufferFloat || mExtensions.colorBufferHalfFloat ||
        mExtensions.colorBufferFloatRGB || mExtensions.colorBufferFloatRGBA;
    if (isES2 && !hasFloatBlending)
    {
        red   = clamp01(red);
        green = clamp01(green);
        blue  = clamp01(blue);
        alpha = clamp01(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)
{
    for (BlendState &blendState : mBlendStateArray)
    {
        blendState.blendEquationRGB   = rgbEquation;
        blendState.blendEquationAlpha = alphaEquation;
    }

    mBlendStateExt.setEquations(rgbEquation, alphaEquation);
    mDirtyBits.set(DIRTY_BIT_BLEND_EQUATIONS);
}

void State::setBlendEquationIndexed(GLenum rgbEquation, GLenum alphaEquation, GLuint index)
{
    ASSERT(index < mBlendStateArray.size());
    mBlendStateArray[index].blendEquationRGB   = rgbEquation;
    mBlendStateArray[index].blendEquationAlpha = alphaEquation;

    mBlendStateExt.setEquationsIndexed(index, rgbEquation, alphaEquation);
    mDirtyBits.set(DIRTY_BIT_BLEND_EQUATIONS);
}

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

void State::setStencilParams(GLenum stencilFunc, GLint stencilRef, GLuint stencilMask)
{
    if (mDepthStencil.stencilFunc != stencilFunc || mStencilRef != stencilRef ||
        mDepthStencil.stencilMask != stencilMask)
    {
        mDepthStencil.stencilFunc = stencilFunc;
        mStencilRef               = stencilRef;
        mDepthStencil.stencilMask = stencilMask;
        mDirtyBits.set(DIRTY_BIT_STENCIL_FUNCS_FRONT);
    }
}

void State::setStencilBackParams(GLenum stencilBackFunc,
                                 GLint stencilBackRef,
                                 GLuint stencilBackMask)
{
    if (mDepthStencil.stencilBackFunc != stencilBackFunc || mStencilBackRef != stencilBackRef ||
        mDepthStencil.stencilBackMask != stencilBackMask)
    {
        mDepthStencil.stencilBackFunc = stencilBackFunc;
        mStencilBackRef               = stencilBackRef;
        mDepthStencil.stencilBackMask = stencilBackMask;
        mDirtyBits.set(DIRTY_BIT_STENCIL_FUNCS_BACK);
    }
}

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

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

void State::setStencilOperations(GLenum stencilFail,
                                 GLenum stencilPassDepthFail,
                                 GLenum stencilPassDepthPass)
{
    if (mDepthStencil.stencilFail != stencilFail ||
        mDepthStencil.stencilPassDepthFail != stencilPassDepthFail ||
        mDepthStencil.stencilPassDepthPass != 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)
{
    if (mDepthStencil.stencilBackFail != stencilBackFail ||
        mDepthStencil.stencilBackPassDepthFail != stencilBackPassDepthFail ||
        mDepthStencil.stencilBackPassDepthPass != stencilBackPassDepthPass)
    {
        mDepthStencil.stencilBackFail          = stencilBackFail;
        mDepthStencil.stencilBackPassDepthFail = stencilBackPassDepthFail;
        mDepthStencil.stencilBackPassDepthPass = stencilBackPassDepthPass;
        mDirtyBits.set(DIRTY_BIT_STENCIL_OPS_BACK);
    }
}

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);
}

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

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);
}

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);
}

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

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

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

void State::setScissorParams(GLint x, GLint y, GLsizei width, GLsizei height)
{
    // Skip if same scissor info
    if (mScissor.x != x || mScissor.y != y || mScissor.width != width || mScissor.height != height)
    {
        mScissor.x      = x;
        mScissor.y      = y;
        mScissor.width  = width;
        mScissor.height = height;
        mDirtyBits.set(DIRTY_BIT_SCISSOR);
    }
}

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

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

void State::setClipDistanceEnable(int idx, bool enable)
{
    if (enable)
    {
        mClipDistancesEnabled.set(idx);
    }
    else
    {
        mClipDistancesEnabled.reset(idx);
    }

    mDirtyBits.set(DIRTY_BIT_EXTENDED);
}

void State::setEnableFeature(GLenum feature, bool enabled)
{
    switch (feature)
    {
        case GL_MULTISAMPLE_EXT:
            setMultisampling(enabled);
            return;
        case GL_SAMPLE_ALPHA_TO_ONE_EXT:
            setSampleAlphaToOne(enabled);
            return;
        case GL_CULL_FACE:
            setCullFace(enabled);
            return;
        case GL_POLYGON_OFFSET_FILL:
            setPolygonOffsetFill(enabled);
            return;
        case GL_SAMPLE_ALPHA_TO_COVERAGE:
            setSampleAlphaToCoverage(enabled);
            return;
        case GL_SAMPLE_COVERAGE:
            setSampleCoverage(enabled);
            return;
        case GL_SCISSOR_TEST:
            setScissorTest(enabled);
            return;
        case GL_STENCIL_TEST:
            setStencilTest(enabled);
            return;
        case GL_DEPTH_TEST:
            setDepthTest(enabled);
            return;
        case GL_BLEND:
            setBlend(enabled);
            return;
        case GL_DITHER:
            setDither(enabled);
            return;
        case GL_PRIMITIVE_RESTART_FIXED_INDEX:
            setPrimitiveRestart(enabled);
            return;
        case GL_RASTERIZER_DISCARD:
            setRasterizerDiscard(enabled);
            return;
        case GL_SAMPLE_MASK:
            setSampleMaskEnabled(enabled);
            return;
        case GL_DEBUG_OUTPUT_SYNCHRONOUS:
            mDebug.setOutputSynchronous(enabled);
            return;
        case GL_DEBUG_OUTPUT:
            mDebug.setOutputEnabled(enabled);
            return;
        case GL_FRAMEBUFFER_SRGB_EXT:
            setFramebufferSRGB(enabled);
            return;
        case GL_TEXTURE_RECTANGLE_ANGLE:
            mTextureRectangleEnabled = enabled;
            return;
        // GL_APPLE_clip_distance/GL_EXT_clip_cull_distance
        case GL_CLIP_DISTANCE0_EXT:
        case GL_CLIP_DISTANCE1_EXT:
        case GL_CLIP_DISTANCE2_EXT:
        case GL_CLIP_DISTANCE3_EXT:
        case GL_CLIP_DISTANCE4_EXT:
        case GL_CLIP_DISTANCE5_EXT:
        case GL_CLIP_DISTANCE6_EXT:
        case GL_CLIP_DISTANCE7_EXT:
            // NOTE(hqle): These enums are conflicted with GLES1's enums, need
            // to do additional check here:
            if (mClientVersion.major >= 2)
            {
                setClipDistanceEnable(feature - GL_CLIP_DISTANCE0_EXT, enabled);
                return;
            }
    }

    ASSERT(mClientVersion.major == 1);

    // GLES1 emulation. Need to separate from main switch due to conflict enum between
    // GL_CLIP_DISTANCE0_EXT & GL_CLIP_PLANE0
    switch (feature)
    {
        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();
    }
}

void State::setEnableFeatureIndexed(GLenum feature, bool enabled, GLuint index)
{
    switch (feature)
    {
        case GL_BLEND:
            setBlendIndexed(enabled, index);
            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;
        case GL_TEXTURE_RECTANGLE_ANGLE:
            return mTextureRectangleEnabled;

        // GL_APPLE_clip_distance/GL_EXT_clip_cull_distance
        case GL_CLIP_DISTANCE0_EXT:
        case GL_CLIP_DISTANCE1_EXT:
        case GL_CLIP_DISTANCE2_EXT:
        case GL_CLIP_DISTANCE3_EXT:
        case GL_CLIP_DISTANCE4_EXT:
        case GL_CLIP_DISTANCE5_EXT:
        case GL_CLIP_DISTANCE6_EXT:
        case GL_CLIP_DISTANCE7_EXT:
            if (mClientVersion.major >= 2)
            {
                // If GLES version is 1, the GL_CLIP_DISTANCE0_EXT enum will be used as
                // GL_CLIP_PLANE0 instead.
                return mClipDistancesEnabled.test(feature - GL_CLIP_DISTANCE0_EXT);
            }
            break;
    }

    ASSERT(mClientVersion.major == 1);

    switch (feature)
    {
        // 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;
    }
}

bool State::getEnableFeatureIndexed(GLenum feature, GLuint index) const
{
    switch (feature)
    {
        case GL_BLEND:
            return isBlendEnabledIndexed(index);
        default:
            UNREACHABLE();
            return false;
    }
}

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

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

GLenum State::getGenerateMipmapHint() const
{
    return mGenerateMipmapHint;
}

void State::setTextureFilteringHint(GLenum hint)
{
    mTextureFilteringHint = hint;
    // Note: we don't add a dirty bit for this flag as it's not expected to be toggled at
    // runtime.
}

GLenum State::getTextureFilteringHint() const
{
    return mTextureFilteringHint;
}

void State::setFragmentShaderDerivativeHint(GLenum hint)
{
    mFragmentShaderDerivativeHint = hint;
    mDirtyBits.set(DIRTY_BIT_EXTENDED);
    // 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.
}

void State::setViewportParams(GLint x, GLint y, GLsizei width, GLsizei height)
{
    // Skip if same viewport info
    if (mViewport.x != x || mViewport.y != y || mViewport.width != width ||
        mViewport.height != height)
    {
        mViewport.x      = x;
        mViewport.y      = y;
        mViewport.width  = width;
        mViewport.height = height;
        mDirtyBits.set(DIRTY_BIT_VIEWPORT);
    }
}

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

void State::setSamplerTexture(const Context *context, TextureType type, Texture *texture)
{
    if (mExecutable && mExecutable->getActiveSamplersMask()[mActiveSampler] &&
        IsTextureCompatibleWithSampler(type, mExecutable->getActiveSamplerTypes()[mActiveSampler]))
    {
        updateActiveTexture(context, mActiveSampler, texture);
    }

    mSamplerTextures[type][mActiveSampler].set(context, texture);

    mDirtyBits.set(DIRTY_BIT_TEXTURE_BINDINGS);
}

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

TextureID 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, TextureID 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 (size_t bindingIndex = 0; bindingIndex < textureVector.size(); ++bindingIndex)
        {
            BindingPointer<Texture> &binding = textureVector[bindingIndex];
            if (binding.id() == texture)
            {
                // Zero textures are the "default" textures instead of NULL
                Texture *zeroTexture = zeroTextures[type].get();
                ASSERT(zeroTexture != nullptr);
                if (mCompleteTextureBindings[bindingIndex].getSubject() == binding.get())
                {
                    updateActiveTexture(context, bindingIndex, zeroTexture);
                }
                binding.set(context, zeroTexture);
            }
        }
    }

    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;
        }
    }

    // [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))
    {
        setDrawFramebufferDirty();
    }
}

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::invalidateTexture(TextureType type)
{
    mDirtyBits.set(DIRTY_BIT_TEXTURE_BINDINGS);
}

void State::setSamplerBinding(const Context *context, GLuint textureUnit, Sampler *sampler)
{
    if (mSamplers[textureUnit].get() == sampler)
    {
        return;
    }

    mSamplers[textureUnit].set(context, sampler);
    mDirtyBits.set(DIRTY_BIT_SAMPLER_BINDINGS);
    // This is overly conservative as it assumes the sampler has never been bound.
    setSamplerDirty(textureUnit);
    onActiveTextureChange(context, textureUnit);
    onActiveTextureStateChange(context, textureUnit);
}

void State::detachSampler(const Context *context, SamplerID 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 (size_t i = 0; i < mSamplers.size(); i++)
    {
        if (mSamplers[i].id() == sampler)
        {
            setSamplerBinding(context, static_cast<GLuint>(i), nullptr);
        }
    }
}

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

void State::detachRenderbuffer(const Context *context, RenderbufferID 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))
        {
            setDrawFramebufferDirty();
        }
    }
}

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

        if (mRobustResourceInit && mDrawFramebuffer->hasResourceThatNeedsInit())
        {
            mDirtyObjects.set(DIRTY_OBJECT_DRAW_ATTACHMENTS);
        }
    }
}

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;
    }
}

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

    return false;
}

bool State::removeDrawFramebufferBinding(FramebufferID 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);
    }
}

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

    return false;
}

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

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::setVertexAttribFormat(GLuint attribIndex,
                                  GLint size,
                                  VertexAttribType 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);
}

angle::Result State::setProgram(const Context *context, Program *newProgram)
{
    if (mProgram != newProgram)
    {
        if (mProgram)
        {
            unsetActiveTextures(mExecutable->getActiveSamplersMask());
            mProgram->release(context);
        }

        mProgram    = newProgram;
        mExecutable = nullptr;

        if (mProgram)
        {
            mExecutable = &mProgram->getExecutable();
            newProgram->addRef();
            ANGLE_TRY(onProgramExecutableChange(context, newProgram));
        }
        else if (mProgramPipeline.get())
        {
            mExecutable = &mProgramPipeline->getExecutable();
        }

        // Note that rendering is undefined if glUseProgram(0) is called. But ANGLE will generate
        // an error if the app tries to draw in this case.

        mDirtyBits.set(DIRTY_BIT_PROGRAM_BINDING);
    }

    return angle::Result::Continue;
}

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

    return false;
}

angle::Result State::useProgramStages(const Context *context,
                                      ProgramPipeline *programPipeline,
                                      GLbitfield stages,
                                      Program *shaderProgram)
{
    programPipeline->useProgramStages(context, stages, shaderProgram);
    ANGLE_TRY(onProgramPipelineExecutableChange(context, programPipeline));

    return angle::Result::Continue;
}

angle::Result State::setProgramPipelineBinding(const Context *context, ProgramPipeline *pipeline)
{
    if (mProgramPipeline.get() == pipeline)
    {
        return angle::Result::Continue;
    }

    if (mProgramPipeline.get())
    {
        unsetActiveTextures(mProgramPipeline->getExecutable().getActiveSamplersMask());
    }

    mProgramPipeline.set(context, pipeline);
    mDirtyBits.set(DIRTY_BIT_PROGRAM_BINDING);

    // A bound Program always overrides the ProgramPipeline, so only update the
    // current ProgramExecutable if there isn't currently a Program bound.
    if (!mProgram)
    {
        if (mProgramPipeline.get())
        {
            mExecutable = &mProgramPipeline->getExecutable();
        }
        else
        {
            mExecutable = nullptr;
        }
    }

    if (mProgramPipeline.get())
    {
        ANGLE_TRY(onProgramPipelineExecutableChange(context, mProgramPipeline.get()));

        if (mProgramPipeline->hasAnyDirtyBit())
        {
            mDirtyObjects.set(DIRTY_OBJECT_PROGRAM_PIPELINE);
        }
    }

    return angle::Result::Continue;
}

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

    // A bound Program always overrides the ProgramPipeline, so only update the
    // current ProgramExecutable if there isn't currently a Program bound.
    if (!mProgram)
    {
        mExecutable = 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);
}

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

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

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

    switch (target)
    {
        case BufferBinding::TransformFeedback:
            ANGLE_TRY(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;
    }

    return angle::Result::Continue;
}

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

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

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

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

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

    if (getVertexArray()->detachBuffer(context, bufferID))
    {
        mDirtyObjects.set(DIRTY_OBJECT_VERTEX_ARRAY);
        context->getStateCache().onVertexArrayStateChange(context);
    }

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

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

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

    return angle::Result::Continue;
}

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);
    SetComponentTypeMask(ComponentType::Float, index, &mCurrentValuesTypeMask);
}

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);
    SetComponentTypeMask(ComponentType::UnsignedInt, index, &mCurrentValuesTypeMask);
}

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);
    SetComponentTypeMask(ComponentType::Int, index, &mCurrentValuesTypeMask);
}

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

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);
}

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

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

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

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

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

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

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

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

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

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

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

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

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

void State::getBooleanv(GLenum pname, GLboolean *params) const
{
    switch (pname)
    {
        case GL_SAMPLE_COVERAGE_INVERT:
            *params = mSampleCoverageInvert;
            break;
        case GL_DEPTH_WRITEMASK:
            *params = mDepthStencil.depthMask;
            break;
        case GL_COLOR_WRITEMASK:
            // non-indexed get returns the state of draw buffer zero
            params[0] = mBlendStateArray[0].colorMaskRed;
            params[1] = mBlendStateArray[0].colorMaskGreen;
            params[2] = mBlendStateArray[0].colorMaskBlue;
            params[3] = mBlendStateArray[0].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 = mSampleAlphaToCoverage;
            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:
            // non-indexed get returns the state of draw buffer zero
            *params = mBlendStateArray[0].blend;
            break;
        case GL_DITHER:
            *params = mRasterizer.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_TEXTURE_RECTANGLE_ANGLE:
            *params = mTextureRectangleEnabled ? 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) const
{
    // 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().constData(), 16 * sizeof(GLfloat));
            break;
        case GL_PROJECTION_MATRIX:
            memcpy(params, mGLES1State.mProjectionMatrices.back().constData(),
                   16 * sizeof(GLfloat));
            break;
        case GL_TEXTURE_MATRIX:
            memcpy(params, mGLES1State.mTextureMatrices[mActiveSampler].back().constData(),
                   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;
    }
}

angle::Result State::getIntegerv(const Context *context, GLenum pname, GLint *params) const
{
    if (pname >= GL_DRAW_BUFFER0_EXT && pname <= GL_DRAW_BUFFER15_EXT)
    {
        size_t drawBuffer = (pname - GL_DRAW_BUFFER0_EXT);
        ASSERT(drawBuffer < mMaxDrawBuffers);
        Framebuffer *framebuffer = mDrawFramebuffer;
        // The default framebuffer may have fewer draw buffer states than a user-created one. The
        // user is always allowed to query up to GL_MAX_DRAWBUFFERS so just return GL_NONE here if
        // the draw buffer is out of range for this framebuffer.
        *params = drawBuffer < framebuffer->getDrawbufferStateCount()
                      ? framebuffer->getDrawBufferState(drawBuffer)
                      : GL_NONE;
        return angle::Result::Continue;
    }

    // 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().value;
            break;
        case GL_DRAW_INDIRECT_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::DrawIndirect].id().value;
            break;
        case GL_ELEMENT_ARRAY_BUFFER_BINDING:
        {
            Buffer *elementArrayBuffer = getVertexArray()->getElementArrayBuffer();
            *params                    = elementArrayBuffer ? elementArrayBuffer->id().value : 0;
            break;
        }
        case GL_DRAW_FRAMEBUFFER_BINDING:
            static_assert(GL_DRAW_FRAMEBUFFER_BINDING == GL_DRAW_FRAMEBUFFER_BINDING_ANGLE,
                          "Enum mismatch");
            *params = mDrawFramebuffer->id().value;
            break;
        case GL_READ_FRAMEBUFFER_BINDING:
            static_assert(GL_READ_FRAMEBUFFER_BINDING == GL_READ_FRAMEBUFFER_BINDING_ANGLE,
                          "Enum mismatch");
            *params = mReadFramebuffer->id().value;
            break;
        case GL_RENDERBUFFER_BINDING:
            *params = mRenderbuffer.id().value;
            break;
        case GL_VERTEX_ARRAY_BINDING:
            *params = mVertexArray->id().value;
            break;
        case GL_CURRENT_PROGRAM:
            *params = mProgram ? mProgram->id().value : 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_TEXTURE_FILTERING_HINT_CHROMIUM:
            *params = mTextureFilteringHint;
            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(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(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:
            // non-indexed get returns the state of draw buffer zero
            *params = mBlendStateArray[0].sourceBlendRGB;
            break;
        case GL_BLEND_SRC_ALPHA:
            *params = mBlendStateArray[0].sourceBlendAlpha;
            break;
        case GL_BLEND_DST_RGB:
            *params = mBlendStateArray[0].destBlendRGB;
            break;
        case GL_BLEND_DST_ALPHA:
            *params = mBlendStateArray[0].destBlendAlpha;
            break;
        case GL_BLEND_EQUATION_RGB:
            *params = mBlendStateArray[0].blendEquationRGB;
            break;
        case GL_BLEND_EQUATION_ALPHA:
            *params = mBlendStateArray[0].blendEquationAlpha;
            break;
        case GL_STENCIL_WRITEMASK:
            *params = CastMaskValue(mDepthStencil.stencilWritemask);
            break;
        case GL_STENCIL_BACK_WRITEMASK:
            *params = CastMaskValue(mDepthStencil.stencilBackWritemask);
            break;
        case GL_STENCIL_CLEAR_VALUE:
            *params = mStencilClearValue;
            break;
        case GL_IMPLEMENTATION_COLOR_READ_TYPE:
            *params = mReadFramebuffer->getImplementationColorReadType(context);
            break;
        case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
            *params = mReadFramebuffer->getImplementationColorReadFormat(context);
            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->getFirstColorAttachment();

            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->getDepthAttachment();

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

            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)
                    .value;
            break;
        case GL_TEXTURE_BINDING_RECTANGLE_ANGLE:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params = getSamplerTextureId(static_cast<unsigned int>(mActiveSampler),
                                          TextureType::Rectangle)
                          .value;
            break;
        case GL_TEXTURE_BINDING_CUBE_MAP:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params =
                getSamplerTextureId(static_cast<unsigned int>(mActiveSampler), TextureType::CubeMap)
                    .value;
            break;
        case GL_TEXTURE_BINDING_3D:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params =
                getSamplerTextureId(static_cast<unsigned int>(mActiveSampler), TextureType::_3D)
                    .value;
            break;
        case GL_TEXTURE_BINDING_2D_ARRAY:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params = getSamplerTextureId(static_cast<unsigned int>(mActiveSampler),
                                          TextureType::_2DArray)
                          .value;
            break;
        case GL_TEXTURE_BINDING_2D_MULTISAMPLE:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params = getSamplerTextureId(static_cast<unsigned int>(mActiveSampler),
                                          TextureType::_2DMultisample)
                          .value;
            break;
        case GL_TEXTURE_BINDING_2D_MULTISAMPLE_ARRAY:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params = getSamplerTextureId(static_cast<unsigned int>(mActiveSampler),
                                          TextureType::_2DMultisampleArray)
                          .value;
            break;
        case GL_TEXTURE_BINDING_CUBE_MAP_ARRAY:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params = getSamplerTextureId(static_cast<unsigned int>(mActiveSampler),
                                          TextureType::CubeMapArray)
                          .value;
            break;
        case GL_TEXTURE_BINDING_EXTERNAL_OES:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params = getSamplerTextureId(static_cast<unsigned int>(mActiveSampler),
                                          TextureType::External)
                          .value;
            break;
        case GL_UNIFORM_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::Uniform].id().value;
            break;
        case GL_TRANSFORM_FEEDBACK_BINDING:
            *params = mTransformFeedback.id().value;
            break;
        case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::TransformFeedback].id().value;
            break;
        case GL_COPY_READ_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::CopyRead].id().value;
            break;
        case GL_COPY_WRITE_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::CopyWrite].id().value;
            break;
        case GL_PIXEL_PACK_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::PixelPack].id().value;
            break;
        case GL_PIXEL_UNPACK_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::PixelUnpack].id().value;
            break;
        case GL_READ_BUFFER:
            *params = mReadFramebuffer->getReadBufferState();
            break;
        case GL_SAMPLER_BINDING:
            ASSERT(mActiveSampler < mMaxCombinedTextureImageUnits);
            *params = getSamplerId(static_cast<GLuint>(mActiveSampler)).value;
            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().value;
            break;
        case GL_SHADER_STORAGE_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::ShaderStorage].id().value;
            break;
        case GL_DISPATCH_INDIRECT_BUFFER_BINDING:
            *params = mBoundBuffers[BufferBinding::DispatchIndirect].id().value;
            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:
            // non-indexed get returns the state of draw buffer zero
            *params = mBlendStateArray[0].sourceBlendRGB;
            break;
        case GL_BLEND_DST:
            *params = mBlendStateArray[0].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;

        // GL_ANGLE_provoking_vertex
        case GL_PROVOKING_VERTEX:
            *params = ToGLenum(mProvokingVertex);
            break;

        case GL_PROGRAM_PIPELINE_BINDING:
        {
            ProgramPipeline *pipeline = getProgramPipeline();
            if (pipeline)
            {
                *params = pipeline->id().value;
            }
            else
            {
                *params = 0;
            }
            break;
        }

        default:
            UNREACHABLE();
            break;
    }

    return angle::Result::Continue;
}

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) const
{
    switch (target)
    {
        case GL_BLEND_SRC_RGB:
            ASSERT(static_cast<size_t>(index) < mBlendStateArray.size());
            *data = mBlendStateArray[index].sourceBlendRGB;
            break;
        case GL_BLEND_SRC_ALPHA:
            ASSERT(static_cast<size_t>(index) < mBlendStateArray.size());
            *data = mBlendStateArray[index].sourceBlendAlpha;
            break;
        case GL_BLEND_DST_RGB:
            ASSERT(static_cast<size_t>(index) < mBlendStateArray.size());
            *data = mBlendStateArray[index].destBlendRGB;
            break;
        case GL_BLEND_DST_ALPHA:
            ASSERT(static_cast<size_t>(index) < mBlendStateArray.size());
            *data = mBlendStateArray[index].destBlendAlpha;
            break;
        case GL_BLEND_EQUATION_RGB:
            ASSERT(static_cast<size_t>(index) < mBlendStateArray.size());
            *data = mBlendStateArray[index].blendEquationRGB;
            break;
        case GL_BLEND_EQUATION_ALPHA:
            ASSERT(static_cast<size_t>(index) < mBlendStateArray.size());
            *data = mBlendStateArray[index].blendEquationAlpha;
            break;
        case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING:
            ASSERT(static_cast<size_t>(index) < mTransformFeedback->getIndexedBufferCount());
            *data = mTransformFeedback->getIndexedBuffer(index).id().value;
            break;
        case GL_UNIFORM_BUFFER_BINDING:
            ASSERT(static_cast<size_t>(index) < mUniformBuffers.size());
            *data = mUniformBuffers[index].id().value;
            break;
        case GL_ATOMIC_COUNTER_BUFFER_BINDING:
            ASSERT(static_cast<size_t>(index) < mAtomicCounterBuffers.size());
            *data = mAtomicCounterBuffers[index].id().value;
            break;
        case GL_SHADER_STORAGE_BUFFER_BINDING:
            ASSERT(static_cast<size_t>(index) < mShaderStorageBuffers.size());
            *data = mShaderStorageBuffers[index].id().value;
            break;
        case GL_VERTEX_BINDING_BUFFER:
            ASSERT(static_cast<size_t>(index) < mVertexArray->getMaxBindings());
            *data = mVertexArray->getVertexBinding(index).getBuffer().id().value;
            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().value;
            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) const
{
    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) const
{
    switch (target)
    {
        case GL_COLOR_WRITEMASK:
            ASSERT(static_cast<size_t>(index) < mBlendStateArray.size());
            data[0] = mBlendStateArray[index].colorMaskRed;
            data[1] = mBlendStateArray[index].colorMaskGreen;
            data[2] = mBlendStateArray[index].colorMaskBlue;
            data[3] = mBlendStateArray[index].colorMaskAlpha;
            break;
        case GL_IMAGE_BINDING_LAYERED:
            ASSERT(static_cast<size_t>(index) < mImageUnits.size());
            *data = mImageUnits[index].layered;
            break;
        default:
            UNREACHABLE();
            break;
    }
}

// TODO(https://anglebug.com/3889): Remove this helper function after blink and chromium part
// refactory done.
Texture *State::getTextureForActiveSampler(TextureType type, size_t index)
{
    if (type != TextureType::VideoImage)
    {
        return mSamplerTextures[type][index].get();
    }

    ASSERT(type == TextureType::VideoImage);

    Texture *candidateTexture = mSamplerTextures[type][index].get();
    if (candidateTexture->getWidth(TextureTarget::VideoImage, 0) == 0 ||
        candidateTexture->getHeight(TextureTarget::VideoImage, 0) == 0 ||
        candidateTexture->getDepth(TextureTarget::VideoImage, 0) == 0)
    {
        return mSamplerTextures[TextureType::_2D][index].get();
    }

    return mSamplerTextures[type][index].get();
}

angle::Result State::syncTexturesInit(const Context *context)
{
    ASSERT(mRobustResourceInit);

    if (!mProgram)
        return angle::Result::Continue;

    for (size_t textureUnitIndex : mExecutable->getActiveSamplersMask())
    {
        Texture *texture = mActiveTexturesCache[textureUnitIndex];
        if (texture)
        {
            ANGLE_TRY(texture->ensureInitialized(context));
        }
    }
    return angle::Result::Continue;
}

angle::Result State::syncImagesInit(const Context *context)
{
    ASSERT(mRobustResourceInit);
    ASSERT(mProgram);
    for (size_t imageUnitIndex : mExecutable->getActiveImagesMask())
    {
        Texture *texture = mImageUnits[imageUnitIndex].texture.get();
        if (texture)
        {
            ANGLE_TRY(texture->ensureInitialized(context));
        }
    }
    return angle::Result::Continue;
}

angle::Result State::syncReadAttachments(const Context *context)
{
    ASSERT(mReadFramebuffer);
    ASSERT(mRobustResourceInit);
    return mReadFramebuffer->ensureReadAttachmentsInitialized(context);
}

angle::Result State::syncDrawAttachments(const Context *context)
{
    ASSERT(mDrawFramebuffer);
    ASSERT(mRobustResourceInit);
    return mDrawFramebuffer->ensureDrawAttachmentsInitialized(context);
}

angle::Result State::syncReadFramebuffer(const Context *context)
{
    ASSERT(mReadFramebuffer);
    return mReadFramebuffer->syncState(context, GL_READ_FRAMEBUFFER);
}

angle::Result State::syncDrawFramebuffer(const Context *context)
{
    ASSERT(mDrawFramebuffer);
    return mDrawFramebuffer->syncState(context, GL_DRAW_FRAMEBUFFER);
}

angle::Result State::syncTextures(const Context *context)
{
    if (mDirtyTextures.none())
        return angle::Result::Continue;

    for (size_t textureIndex : mDirtyTextures)
    {
        Texture *texture = mActiveTexturesCache[textureIndex];
        if (texture && texture->hasAnyDirtyBit())
        {
            ANGLE_TRY(texture->syncState(context, TextureCommand::Other));
        }
    }

    mDirtyTextures.reset();
    return angle::Result::Continue;
}

angle::Result State::syncImages(const Context *context)
{
    if (mDirtyImages.none())
        return angle::Result::Continue;

    for (size_t imageUnitIndex : mDirtyImages)
    {
        Texture *texture = mImageUnits[imageUnitIndex].texture.get();
        if (texture && texture->hasAnyDirtyBit())
        {
            ANGLE_TRY(texture->syncState(context, TextureCommand::Other));
        }
    }

    mDirtyImages.reset();
    return angle::Result::Continue;
}

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

    for (size_t samplerIndex : mDirtySamplers)
    {
        BindingPointer<Sampler> &sampler = mSamplers[samplerIndex];
        if (sampler.get() && sampler->isDirty())
        {
            ANGLE_TRY(sampler->syncState(context));
        }
    }

    mDirtySamplers.reset();

    return angle::Result::Continue;
}

angle::Result State::syncVertexArray(const Context *context)
{
    ASSERT(mVertexArray);
    return mVertexArray->syncState(context);
}

angle::Result State::syncProgram(const Context *context)
{
    // There may not be a program if the calling application only uses program pipelines.
    if (mProgram)
    {
        return mProgram->syncState(context);
    }
    return angle::Result::Continue;
}

angle::Result State::syncProgramPipeline(const Context *context)
{
    // There may not be a program pipeline if the calling application only uses programs.
    if (mProgramPipeline.get())
    {
        return mProgramPipeline->syncState(context);
    }
    return angle::Result::Continue;
}

angle::Result 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_TEXTURES);
            break;
        case GL_SAMPLER:
            localSet.set(DIRTY_OBJECT_SAMPLERS);
            break;
        case GL_PROGRAM:
            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:
            setDrawFramebufferDirty();
            break;
        case GL_FRAMEBUFFER:
            mDirtyObjects.set(DIRTY_OBJECT_READ_FRAMEBUFFER);
            setDrawFramebufferDirty();
            break;
        case GL_VERTEX_ARRAY:
            mDirtyObjects.set(DIRTY_OBJECT_VERTEX_ARRAY);
            break;
        case GL_PROGRAM:
            mDirtyObjects.set(DIRTY_OBJECT_PROGRAM);
            break;
        default:
            break;
    }
}

angle::Result State::onProgramExecutableChange(const Context *context, 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."
    ASSERT(program->isLinked());

    // If this Program is currently active, we need to update the State's pointer to the current
    // ProgramExecutable if we just changed it.
    if (mProgram == program)
    {
        mExecutable = &program->getExecutable();
    }

    mDirtyBits.set(DIRTY_BIT_PROGRAM_EXECUTABLE);

    if (program->hasAnyDirtyBit())
    {
        mDirtyObjects.set(DIRTY_OBJECT_PROGRAM);
    }

    // Set any bound textures.
    const ProgramExecutable &executable        = program->getExecutable();
    const ActiveTextureTypeArray &textureTypes = executable.getActiveSamplerTypes();
    for (size_t textureIndex : executable.getActiveSamplersMask())
    {
        TextureType type = textureTypes[textureIndex];

        // This can happen if there is a conflicting texture type.
        if (type == TextureType::InvalidEnum)
            continue;

        Texture *texture = getTextureForActiveSampler(type, textureIndex);
        updateActiveTexture(context, textureIndex, texture);
    }

    for (size_t imageUnitIndex : executable.getActiveImagesMask())
    {
        Texture *image = mImageUnits[imageUnitIndex].texture.get();
        if (!image)
            continue;

        if (image->hasAnyDirtyBit())
        {
            ANGLE_TRY(image->syncState(context, TextureCommand::Other));
        }

        if (mRobustResourceInit && image->initState() == InitState::MayNeedInit)
        {
            mDirtyObjects.set(DIRTY_OBJECT_IMAGES_INIT);
        }
    }

    return angle::Result::Continue;
}

angle::Result State::onProgramPipelineExecutableChange(const Context *context,
                                                       ProgramPipeline *programPipeline)
{
    mDirtyBits.set(DIRTY_BIT_PROGRAM_EXECUTABLE);

    if (programPipeline->hasAnyDirtyBit())
    {
        mDirtyObjects.set(DIRTY_OBJECT_PROGRAM_PIPELINE);
    }

    // Set any bound textures.
    const ActiveTextureTypeArray &textureTypes =
        programPipeline->getExecutable().getActiveSamplerTypes();
    for (size_t textureIndex : programPipeline->getExecutable().getActiveSamplersMask())
    {
        TextureType type = textureTypes[textureIndex];

        // This can happen if there is a conflicting texture type.
        if (type == TextureType::InvalidEnum)
            continue;

        Texture *texture = getTextureForActiveSampler(type, textureIndex);
        updateActiveTexture(context, textureIndex, texture);
    }

    for (size_t imageUnitIndex : programPipeline->getExecutable().getActiveImagesMask())
    {
        Texture *image = mImageUnits[imageUnitIndex].texture.get();
        if (!image)
            continue;

        if (image->hasAnyDirtyBit())
        {
            ANGLE_TRY(image->syncState(context, TextureCommand::Other));
        }

        if (mRobustResourceInit && image->initState() == InitState::MayNeedInit)
        {
            mDirtyObjects.set(DIRTY_OBJECT_IMAGES_INIT);
        }
    }

    return angle::Result::Continue;
}

void State::setTextureDirty(size_t textureUnitIndex)
{
    mDirtyObjects.set(DIRTY_OBJECT_TEXTURES);
    mDirtyTextures.set(textureUnitIndex);
}

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)
{
    ImageUnit &imageUnit = mImageUnits[unit];

    if (imageUnit.texture.get())
    {
        imageUnit.texture->onUnbindAsImageTexture(mID);
    }
    if (texture)
    {
        texture->onBindAsImageTexture(mID);
    }
    imageUnit.texture.set(context, texture);
    imageUnit.level   = level;
    imageUnit.layered = layered;
    imageUnit.layer   = layer;
    imageUnit.access  = access;
    imageUnit.format  = format;
    mDirtyBits.set(DIRTY_BIT_IMAGE_BINDINGS);

    onImageStateChange(context, unit);
}

// Handle a dirty texture event.
void State::onActiveTextureChange(const Context *context, size_t textureUnit)
{
    if (mExecutable)
    {
        TextureType type       = mExecutable->getActiveSamplerTypes()[textureUnit];
        Texture *activeTexture = (type != TextureType::InvalidEnum)
                                     ? getTextureForActiveSampler(type, textureUnit)
                                     : nullptr;
        updateActiveTexture(context, textureUnit, activeTexture);

        mExecutable->onStateChange(angle::SubjectMessage::SubjectChanged);
    }
}

void State::onActiveTextureStateChange(const Context *context, size_t textureUnit)
{
    if (mExecutable)
    {
        TextureType type       = mExecutable->getActiveSamplerTypes()[textureUnit];
        Texture *activeTexture = (type != TextureType::InvalidEnum)
                                     ? getTextureForActiveSampler(type, textureUnit)
                                     : nullptr;
        const Sampler *sampler = mSamplers[textureUnit].get();
        updateActiveTextureState(context, textureUnit, sampler, activeTexture);
    }
}

void State::onImageStateChange(const Context *context, size_t unit)
{
    if (mExecutable)
    {
        const ImageUnit &image = mImageUnits[unit];

        // Have nothing to do here if no texture bound
        if (!image.texture.get())
            return;

        if (image.texture->hasAnyDirtyBit())
        {
            mDirtyImages.set(unit);
            mDirtyObjects.set(DIRTY_OBJECT_IMAGES);
        }

        if (mRobustResourceInit && image.texture->initState() == InitState::MayNeedInit)
        {
            mDirtyObjects.set(DIRTY_OBJECT_IMAGES_INIT);
        }

        mExecutable->onStateChange(angle::SubjectMessage::SubjectChanged);
    }
}

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);
}

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

constexpr State::DirtyObjectHandler State::kDirtyObjectHandlers[DIRTY_OBJECT_MAX];

}  // namespace gl
