kc3-lang/angle/src/libANGLE/State.h

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• Author : Jamie Madill
  Date : 2018-08-01 11:34:48
  Hash : cc73f241
  Message : Micro-optimize some validation checks. Prepares for caching hasMappedBuffer. Also inclines several checks for faster speed. Bug: angleproject:2746 Change-Id: I74f9408d7b41e245c3f58d367dd2cc8fbace4a7a Reviewed-on: https://chromium-review.googlesource.com/1150762 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Frank Henigman <fjhenigman@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>

• src/libANGLE/State.h

• //
  // Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // State.h: Defines the State class, encapsulating raw GL state
  
  #ifndef LIBANGLE_STATE_H_
  #define LIBANGLE_STATE_H_
  
  #include <bitset>
  #include <memory>
  
  #include "common/Color.h"
  #include "common/angleutils.h"
  #include "common/bitset_utils.h"
  #include "libANGLE/Debug.h"
  #include "libANGLE/GLES1State.h"
  #include "libANGLE/Program.h"
  #include "libANGLE/ProgramPipeline.h"
  #include "libANGLE/RefCountObject.h"
  #include "libANGLE/Renderbuffer.h"
  #include "libANGLE/Sampler.h"
  #include "libANGLE/Texture.h"
  #include "libANGLE/TransformFeedback.h"
  #include "libANGLE/Version.h"
  #include "libANGLE/VertexAttribute.h"
  #include "libANGLE/angletypes.h"
  
  namespace gl
  {
  class Query;
  class VertexArray;
  class Context;
  struct Caps;
  
  class State : public angle::ObserverInterface, angle::NonCopyable
  {
    public:
      State(bool debug,
            bool bindGeneratesResource,
            bool clientArraysEnabled,
            bool robustResourceInit,
            bool programBinaryCacheEnabled);
      ~State() override;
  
      void initialize(const Context *context);
      void reset(const Context *context);
  
      // State chunk getters
      const RasterizerState &getRasterizerState() const;
      const BlendState &getBlendState() const;
      const DepthStencilState &getDepthStencilState() const;
  
      // Clear behavior setters & state parameter block generation function
      void setColorClearValue(float red, float green, float blue, float alpha);
      void setDepthClearValue(float depth);
      void setStencilClearValue(int stencil);
  
      const ColorF &getColorClearValue() const { return mColorClearValue; }
      float getDepthClearValue() const { return mDepthClearValue; }
      int getStencilClearValue() const { return mStencilClearValue; }
  
      // Write mask manipulation
      void setColorMask(bool red, bool green, bool blue, bool alpha);
      void setDepthMask(bool mask);
  
      // Discard toggle & query
      bool isRasterizerDiscardEnabled() const;
      void setRasterizerDiscard(bool enabled);
  
      // Primitive restart
      bool isPrimitiveRestartEnabled() const;
      void setPrimitiveRestart(bool enabled);
  
      // Face culling state manipulation
      bool isCullFaceEnabled() const;
      void setCullFace(bool enabled);
      void setCullMode(CullFaceMode mode);
      void setFrontFace(GLenum front);
  
      // Depth test state manipulation
      bool isDepthTestEnabled() const;
      void setDepthTest(bool enabled);
      void setDepthFunc(GLenum depthFunc);
      void setDepthRange(float zNear, float zFar);
      float getNearPlane() const;
      float getFarPlane() const;
  
      // Blend state manipulation
      bool isBlendEnabled() const;
      void setBlend(bool enabled);
      void setBlendFactors(GLenum sourceRGB, GLenum destRGB, GLenum sourceAlpha, GLenum destAlpha);
      void setBlendColor(float red, float green, float blue, float alpha);
      void setBlendEquation(GLenum rgbEquation, GLenum alphaEquation);
      const ColorF &getBlendColor() const;
  
      // Stencil state maniupulation
      bool isStencilTestEnabled() const;
      void setStencilTest(bool enabled);
      void setStencilParams(GLenum stencilFunc, GLint stencilRef, GLuint stencilMask);
      void setStencilBackParams(GLenum stencilBackFunc, GLint stencilBackRef, GLuint stencilBackMask);
      void setStencilWritemask(GLuint stencilWritemask);
      void setStencilBackWritemask(GLuint stencilBackWritemask);
      void setStencilOperations(GLenum stencilFail,
                                GLenum stencilPassDepthFail,
                                GLenum stencilPassDepthPass);
      void setStencilBackOperations(GLenum stencilBackFail,
                                    GLenum stencilBackPassDepthFail,
                                    GLenum stencilBackPassDepthPass);
      GLint getStencilRef() const;
      GLint getStencilBackRef() const;
  
      // Depth bias/polygon offset state manipulation
      bool isPolygonOffsetFillEnabled() const;
      void setPolygonOffsetFill(bool enabled);
      void setPolygonOffsetParams(GLfloat factor, GLfloat units);
  
      // Multisample coverage state manipulation
      bool isSampleAlphaToCoverageEnabled() const;
      void setSampleAlphaToCoverage(bool enabled);
      bool isSampleCoverageEnabled() const;
      void setSampleCoverage(bool enabled);
      void setSampleCoverageParams(GLclampf value, bool invert);
      GLfloat getSampleCoverageValue() const;
      bool getSampleCoverageInvert() const;
  
      // Multisample mask state manipulation.
      bool isSampleMaskEnabled() const;
      void setSampleMaskEnabled(bool enabled);
      void setSampleMaskParams(GLuint maskNumber, GLbitfield mask);
      GLbitfield getSampleMaskWord(GLuint maskNumber) const;
      GLuint getMaxSampleMaskWords() const;
  
      // Multisampling/alpha to one manipulation.
      void setSampleAlphaToOne(bool enabled);
      bool isSampleAlphaToOneEnabled() const;
      void setMultisampling(bool enabled);
      bool isMultisamplingEnabled() const;
  
      // Scissor test state toggle & query
      bool isScissorTestEnabled() const;
      void setScissorTest(bool enabled);
      void setScissorParams(GLint x, GLint y, GLsizei width, GLsizei height);
      const Rectangle &getScissor() const;
  
      // Dither state toggle & query
      bool isDitherEnabled() const;
      void setDither(bool enabled);
  
      // Generic state toggle & query
      void setEnableFeature(GLenum feature, bool enabled);
      bool getEnableFeature(GLenum feature) const;
  
      // Line width state setter
      void setLineWidth(GLfloat width);
      float getLineWidth() const;
  
      // Hint setters
      void setGenerateMipmapHint(GLenum hint);
      void setFragmentShaderDerivativeHint(GLenum hint);
  
      // GL_CHROMIUM_bind_generates_resource
      bool isBindGeneratesResourceEnabled() const;
  
      // GL_ANGLE_client_arrays
      bool areClientArraysEnabled() const;
  
      // Viewport state setter/getter
      void setViewportParams(GLint x, GLint y, GLsizei width, GLsizei height);
      const Rectangle &getViewport() const;
  
      // Texture binding & active texture unit manipulation
      void setActiveSampler(unsigned int active);
      unsigned int getActiveSampler() const;
      void setSamplerTexture(const Context *context, TextureType type, Texture *texture);
      Texture *getTargetTexture(TextureType type) const;
      Texture *getSamplerTexture(unsigned int sampler, TextureType type) const;
      GLuint getSamplerTextureId(unsigned int sampler, TextureType type) const;
      void detachTexture(const Context *context, const TextureMap &zeroTextures, GLuint texture);
      void initializeZeroTextures(const Context *context, const TextureMap &zeroTextures);
  
      // Sampler object binding manipulation
      void setSamplerBinding(const Context *context, GLuint textureUnit, Sampler *sampler);
      GLuint getSamplerId(GLuint textureUnit) const;
      Sampler *getSampler(GLuint textureUnit) const;
      void detachSampler(const Context *context, GLuint sampler);
  
      // Renderbuffer binding manipulation
      void setRenderbufferBinding(const Context *context, Renderbuffer *renderbuffer);
      GLuint getRenderbufferId() const;
      Renderbuffer *getCurrentRenderbuffer() const;
      void detachRenderbuffer(const Context *context, GLuint renderbuffer);
  
      // Framebuffer binding manipulation
      void setReadFramebufferBinding(Framebuffer *framebuffer);
      void setDrawFramebufferBinding(Framebuffer *framebuffer);
      Framebuffer *getTargetFramebuffer(GLenum target) const;
      Framebuffer *getReadFramebuffer() const;
      Framebuffer *getDrawFramebuffer() const { return mDrawFramebuffer; }
  
      bool removeReadFramebufferBinding(GLuint framebuffer);
      bool removeDrawFramebufferBinding(GLuint framebuffer);
  
      // Vertex array object binding manipulation
      void setVertexArrayBinding(const Context *context, VertexArray *vertexArray);
      GLuint getVertexArrayId() const;
      VertexArray *getVertexArray() const
      {
          ASSERT(mVertexArray != nullptr);
          return mVertexArray;
      }
  
      bool removeVertexArrayBinding(const Context *context, GLuint vertexArray);
  
      // Program binding manipulation
      void setProgram(const Context *context, Program *newProgram);
      Program *getProgram() const { return mProgram; }
  
      // Transform feedback object (not buffer) binding manipulation
      void setTransformFeedbackBinding(const Context *context, TransformFeedback *transformFeedback);
      TransformFeedback *getCurrentTransformFeedback() const { return mTransformFeedback.get(); }
  
      bool isTransformFeedbackActiveUnpaused() const;
      bool removeTransformFeedbackBinding(const Context *context, GLuint transformFeedback);
  
      // Query binding manipulation
      bool isQueryActive(QueryType type) const;
      bool isQueryActive(Query *query) const;
      void setActiveQuery(const Context *context, QueryType type, Query *query);
      GLuint getActiveQueryId(QueryType type) const;
      Query *getActiveQuery(QueryType type) const;
  
      // Program Pipeline binding manipulation
      void setProgramPipelineBinding(const Context *context, ProgramPipeline *pipeline);
      void detachProgramPipeline(const Context *context, GLuint pipeline);
  
      //// Typed buffer binding point manipulation ////
      void setBufferBinding(const Context *context, BufferBinding target, Buffer *buffer);
      Buffer *getTargetBuffer(BufferBinding target) const;
      void setIndexedBufferBinding(const Context *context,
                                   BufferBinding target,
                                   GLuint index,
                                   Buffer *buffer,
                                   GLintptr offset,
                                   GLsizeiptr size);
  
      const OffsetBindingPointer<Buffer> &getIndexedUniformBuffer(size_t index) const;
      const OffsetBindingPointer<Buffer> &getIndexedAtomicCounterBuffer(size_t index) const;
      const OffsetBindingPointer<Buffer> &getIndexedShaderStorageBuffer(size_t index) const;
  
      // Detach a buffer from all bindings
      void detachBuffer(const Context *context, const Buffer *buffer);
  
      // Vertex attrib manipulation
      void setEnableVertexAttribArray(unsigned int attribNum, bool enabled);
      void setVertexAttribf(GLuint index, const GLfloat values[4]);
      void setVertexAttribu(GLuint index, const GLuint values[4]);
      void setVertexAttribi(GLuint index, const GLint values[4]);
      void setVertexAttribPointer(const Context *context,
                                  unsigned int attribNum,
                                  Buffer *boundBuffer,
                                  GLint size,
                                  GLenum type,
                                  bool normalized,
                                  bool pureInteger,
                                  GLsizei stride,
                                  const void *pointer);
      void setVertexAttribDivisor(const Context *context, GLuint index, GLuint divisor);
      const VertexAttribCurrentValueData &getVertexAttribCurrentValue(size_t attribNum) const;
      const std::vector<VertexAttribCurrentValueData> &getVertexAttribCurrentValues() const;
      const void *getVertexAttribPointer(unsigned int attribNum) const;
      void bindVertexBuffer(const Context *context,
                            GLuint bindingIndex,
                            Buffer *boundBuffer,
                            GLintptr offset,
                            GLsizei stride);
      void setVertexAttribFormat(GLuint attribIndex,
                                 GLint size,
                                 GLenum type,
                                 bool normalized,
                                 bool pureInteger,
                                 GLuint relativeOffset);
      void setVertexAttribBinding(const Context *context, GLuint attribIndex, GLuint bindingIndex);
      void setVertexBindingDivisor(GLuint bindingIndex, GLuint divisor);
  
      // Pixel pack state manipulation
      void setPackAlignment(GLint alignment);
      GLint getPackAlignment() const;
      void setPackReverseRowOrder(bool reverseRowOrder);
      bool getPackReverseRowOrder() const;
      void setPackRowLength(GLint rowLength);
      GLint getPackRowLength() const;
      void setPackSkipRows(GLint skipRows);
      GLint getPackSkipRows() const;
      void setPackSkipPixels(GLint skipPixels);
      GLint getPackSkipPixels() const;
      const PixelPackState &getPackState() const;
      PixelPackState &getPackState();
  
      // Pixel unpack state manipulation
      void setUnpackAlignment(GLint alignment);
      GLint getUnpackAlignment() const;
      void setUnpackRowLength(GLint rowLength);
      GLint getUnpackRowLength() const;
      void setUnpackImageHeight(GLint imageHeight);
      GLint getUnpackImageHeight() const;
      void setUnpackSkipImages(GLint skipImages);
      GLint getUnpackSkipImages() const;
      void setUnpackSkipRows(GLint skipRows);
      GLint getUnpackSkipRows() const;
      void setUnpackSkipPixels(GLint skipPixels);
      GLint getUnpackSkipPixels() const;
      const PixelUnpackState &getUnpackState() const;
      PixelUnpackState &getUnpackState();
  
      // Debug state
      const Debug &getDebug() const;
      Debug &getDebug();
  
      // CHROMIUM_framebuffer_mixed_samples coverage modulation
      void setCoverageModulation(GLenum components);
      GLenum getCoverageModulation() const;
  
      // CHROMIUM_path_rendering
      void loadPathRenderingMatrix(GLenum matrixMode, const GLfloat *matrix);
      const GLfloat *getPathRenderingMatrix(GLenum which) const;
      void setPathStencilFunc(GLenum func, GLint ref, GLuint mask);
  
      GLenum getPathStencilFunc() const;
      GLint getPathStencilRef() const;
      GLuint getPathStencilMask() const;
  
      // GL_EXT_sRGB_write_control
      void setFramebufferSRGB(bool sRGB);
      bool getFramebufferSRGB() const;
  
      // GL_KHR_parallel_shader_compile
      void setMaxShaderCompilerThreads(GLuint count);
      GLuint getMaxShaderCompilerThreads() const;
  
      // State query functions
      void getBooleanv(GLenum pname, GLboolean *params);
      void getFloatv(GLenum pname, GLfloat *params);
      Error getIntegerv(const Context *context, GLenum pname, GLint *params);
      void getPointerv(const Context *context, GLenum pname, void **params) const;
      void getIntegeri_v(GLenum target, GLuint index, GLint *data);
      void getInteger64i_v(GLenum target, GLuint index, GLint64 *data);
      void getBooleani_v(GLenum target, GLuint index, GLboolean *data);
  
      bool isRobustResourceInitEnabled() const { return mRobustResourceInit; }
  
      // Sets the dirty bit for the program executable.
      void onProgramExecutableChange(Program *program);
  
      enum DirtyBitType
      {
          DIRTY_BIT_SCISSOR_TEST_ENABLED,
          DIRTY_BIT_SCISSOR,
          DIRTY_BIT_VIEWPORT,
          DIRTY_BIT_DEPTH_RANGE,
          DIRTY_BIT_BLEND_ENABLED,
          DIRTY_BIT_BLEND_COLOR,
          DIRTY_BIT_BLEND_FUNCS,
          DIRTY_BIT_BLEND_EQUATIONS,
          DIRTY_BIT_COLOR_MASK,
          DIRTY_BIT_SAMPLE_ALPHA_TO_COVERAGE_ENABLED,
          DIRTY_BIT_SAMPLE_COVERAGE_ENABLED,
          DIRTY_BIT_SAMPLE_COVERAGE,
          DIRTY_BIT_SAMPLE_MASK_ENABLED,
          DIRTY_BIT_SAMPLE_MASK,
          DIRTY_BIT_DEPTH_TEST_ENABLED,
          DIRTY_BIT_DEPTH_FUNC,
          DIRTY_BIT_DEPTH_MASK,
          DIRTY_BIT_STENCIL_TEST_ENABLED,
          DIRTY_BIT_STENCIL_FUNCS_FRONT,
          DIRTY_BIT_STENCIL_FUNCS_BACK,
          DIRTY_BIT_STENCIL_OPS_FRONT,
          DIRTY_BIT_STENCIL_OPS_BACK,
          DIRTY_BIT_STENCIL_WRITEMASK_FRONT,
          DIRTY_BIT_STENCIL_WRITEMASK_BACK,
          DIRTY_BIT_CULL_FACE_ENABLED,
          DIRTY_BIT_CULL_FACE,
          DIRTY_BIT_FRONT_FACE,
          DIRTY_BIT_POLYGON_OFFSET_FILL_ENABLED,
          DIRTY_BIT_POLYGON_OFFSET,
          DIRTY_BIT_RASTERIZER_DISCARD_ENABLED,
          DIRTY_BIT_LINE_WIDTH,
          DIRTY_BIT_PRIMITIVE_RESTART_ENABLED,
          DIRTY_BIT_CLEAR_COLOR,
          DIRTY_BIT_CLEAR_DEPTH,
          DIRTY_BIT_CLEAR_STENCIL,
          DIRTY_BIT_UNPACK_STATE,
          DIRTY_BIT_UNPACK_BUFFER_BINDING,
          DIRTY_BIT_PACK_STATE,
          DIRTY_BIT_PACK_BUFFER_BINDING,
          DIRTY_BIT_DITHER_ENABLED,
          DIRTY_BIT_GENERATE_MIPMAP_HINT,
          DIRTY_BIT_SHADER_DERIVATIVE_HINT,
          DIRTY_BIT_READ_FRAMEBUFFER_BINDING,
          DIRTY_BIT_DRAW_FRAMEBUFFER_BINDING,
          DIRTY_BIT_RENDERBUFFER_BINDING,
          DIRTY_BIT_VERTEX_ARRAY_BINDING,
          DIRTY_BIT_DRAW_INDIRECT_BUFFER_BINDING,
          DIRTY_BIT_DISPATCH_INDIRECT_BUFFER_BINDING,
          DIRTY_BIT_SHADER_STORAGE_BUFFER_BINDING,
          // TODO(jmadill): Fine-grained dirty bits for each index.
          DIRTY_BIT_UNIFORM_BUFFER_BINDINGS,
          DIRTY_BIT_PROGRAM_BINDING,
          DIRTY_BIT_PROGRAM_EXECUTABLE,
          // TODO(jmadill): Fine-grained dirty bits for each texture/sampler.
          DIRTY_BIT_TEXTURE_BINDINGS,
          DIRTY_BIT_SAMPLER_BINDINGS,
          DIRTY_BIT_TRANSFORM_FEEDBACK_BINDING,
          DIRTY_BIT_MULTISAMPLING,
          DIRTY_BIT_SAMPLE_ALPHA_TO_ONE,
          DIRTY_BIT_COVERAGE_MODULATION,         // CHROMIUM_framebuffer_mixed_samples
          DIRTY_BIT_PATH_RENDERING_MATRIX_MV,    // CHROMIUM_path_rendering path model view matrix
          DIRTY_BIT_PATH_RENDERING_MATRIX_PROJ,  // CHROMIUM_path_rendering path projection matrix
          DIRTY_BIT_PATH_RENDERING_STENCIL_STATE,
          DIRTY_BIT_FRAMEBUFFER_SRGB,  // GL_EXT_sRGB_write_control
          DIRTY_BIT_CURRENT_VALUES,
          DIRTY_BIT_INVALID,
          DIRTY_BIT_MAX = DIRTY_BIT_INVALID,
      };
  
      static_assert(DIRTY_BIT_MAX <= 64, "State dirty bits must be capped at 64");
  
      // TODO(jmadill): Consider storing dirty objects in a list instead of by binding.
      enum DirtyObjectType
      {
          DIRTY_OBJECT_READ_FRAMEBUFFER,
          DIRTY_OBJECT_DRAW_FRAMEBUFFER,
          DIRTY_OBJECT_VERTEX_ARRAY,
          // Use a very coarse bit for any program or texture change.
          // TODO(jmadill): Fine-grained dirty bits for each texture/sampler.
          DIRTY_OBJECT_PROGRAM_TEXTURES,
          DIRTY_OBJECT_UNKNOWN,
          DIRTY_OBJECT_MAX = DIRTY_OBJECT_UNKNOWN,
      };
  
      using DirtyBits = angle::BitSet<DIRTY_BIT_MAX>;
      const DirtyBits &getDirtyBits() const { return mDirtyBits; }
      void clearDirtyBits() { mDirtyBits.reset(); }
      void clearDirtyBits(const DirtyBits &bitset) { mDirtyBits &= ~bitset; }
      void setAllDirtyBits() { mDirtyBits.set(); }
  
      using DirtyObjects = angle::BitSet<DIRTY_OBJECT_MAX>;
      void clearDirtyObjects() { mDirtyObjects.reset(); }
      void setAllDirtyObjects() { mDirtyObjects.set(); }
      Error syncDirtyObjects(const Context *context, const DirtyObjects &bitset);
      Error syncDirtyObject(const Context *context, GLenum target);
      void setObjectDirty(GLenum target);
  
      // This actually clears the current value dirty bits.
      // TODO(jmadill): Pass mutable dirty bits into Impl.
      AttributesMask getAndResetDirtyCurrentValues() const;
  
      void setImageUnit(const Context *context,
                        GLuint unit,
                        Texture *texture,
                        GLint level,
                        GLboolean layered,
                        GLint layer,
                        GLenum access,
                        GLenum format);
  
      const ImageUnit &getImageUnit(GLuint unit) const;
      const ActiveTextureMask &getActiveTexturesMask() const { return mActiveTexturesMask; }
      const std::vector<Texture *> &getCompleteTextureCache() const { return mCompleteTextureCache; }
      ComponentTypeMask getCurrentValuesTypeMask() const { return mCurrentValuesTypeMask; }
  
      // Observer implementation.
      void onSubjectStateChange(const Context *context,
                                angle::SubjectIndex index,
                                angle::SubjectMessage message) override;
  
      Error clearUnclearedActiveTextures(const Context *context);
  
      bool isCurrentTransformFeedback(const TransformFeedback *tf) const;
      bool isCurrentVertexArray(const VertexArray *va) const;
  
      GLES1State &gles1() { return mGLES1State; }
      const GLES1State &gles1() const { return mGLES1State; }
  
    private:
      Error syncProgramTextures(const Context *context);
  
      // Cached values from Context's caps
      GLuint mMaxDrawBuffers;
      GLuint mMaxCombinedTextureImageUnits;
  
      ColorF mColorClearValue;
      GLfloat mDepthClearValue;
      int mStencilClearValue;
  
      RasterizerState mRasterizer;
      bool mScissorTest;
      Rectangle mScissor;
  
      BlendState mBlend;
      ColorF mBlendColor;
      bool mSampleCoverage;
      GLfloat mSampleCoverageValue;
      bool mSampleCoverageInvert;
      bool mSampleMask;
      GLuint mMaxSampleMaskWords;
      std::array<GLbitfield, MAX_SAMPLE_MASK_WORDS> mSampleMaskValues;
  
      DepthStencilState mDepthStencil;
      GLint mStencilRef;
      GLint mStencilBackRef;
  
      GLfloat mLineWidth;
  
      GLenum mGenerateMipmapHint;
      GLenum mFragmentShaderDerivativeHint;
  
      const bool mBindGeneratesResource;
      const bool mClientArraysEnabled;
  
      Rectangle mViewport;
      float mNearZ;
      float mFarZ;
  
      Framebuffer *mReadFramebuffer;
      Framebuffer *mDrawFramebuffer;
      BindingPointer<Renderbuffer> mRenderbuffer;
      Program *mProgram;
      BindingPointer<ProgramPipeline> mProgramPipeline;
  
      using VertexAttribVector = std::vector<VertexAttribCurrentValueData>;
      VertexAttribVector mVertexAttribCurrentValues;  // From glVertexAttrib
      VertexArray *mVertexArray;
      ComponentTypeMask mCurrentValuesTypeMask;
  
      // Texture and sampler bindings
      size_t mActiveSampler;  // Active texture unit selector - GL_TEXTURE0
  
      using TextureBindingVector = std::vector<BindingPointer<Texture>>;
      using TextureBindingMap    = angle::PackedEnumMap<TextureType, TextureBindingVector>;
      TextureBindingMap mSamplerTextures;
  
      // Texture Completeness Caching
      // ----------------------------
      // The texture completeness cache uses dirty bits to avoid having to scan the list of textures
      // each draw call. This gl::State class implements angle::Observer interface. When subject
      // Textures have state changes, messages reach 'State' (also any observing Framebuffers) via the
      // onSubjectStateChange method (above). This then invalidates the completeness cache.
      //
      // Note this requires that we also invalidate the completeness cache manually on events like
      // re-binding textures/samplers or a change in the program. For more information see the
      // Observer.h header and the design doc linked there.
  
      // A cache of complete textures. nullptr indicates unbound or incomplete.
      // Don't use BindingPointer because this cache is only valid within a draw call.
      // Also stores a notification channel to the texture itself to handle texture change events.
      std::vector<Texture *> mCompleteTextureCache;
      std::vector<angle::ObserverBinding> mCompleteTextureBindings;
      InitState mCachedTexturesInitState;
      ActiveTextureMask mActiveTexturesMask;
  
      using SamplerBindingVector = std::vector<BindingPointer<Sampler>>;
      SamplerBindingVector mSamplers;
  
      using ImageUnitVector = std::vector<ImageUnit>;
      ImageUnitVector mImageUnits;
  
      using ActiveQueryMap = angle::PackedEnumMap<QueryType, BindingPointer<Query>>;
      ActiveQueryMap mActiveQueries;
  
      // Stores the currently bound buffer for each binding point. It has an entry for the element
      // array buffer but it should not be used. Instead this bind point is owned by the current
      // vertex array object.
      using BoundBufferMap = angle::PackedEnumMap<BufferBinding, BindingPointer<Buffer>>;
      BoundBufferMap mBoundBuffers;
  
      using BufferVector = std::vector<OffsetBindingPointer<Buffer>>;
      BufferVector mUniformBuffers;
      BufferVector mAtomicCounterBuffers;
      BufferVector mShaderStorageBuffers;
  
      BindingPointer<TransformFeedback> mTransformFeedback;
  
      PixelUnpackState mUnpack;
      PixelPackState mPack;
  
      bool mPrimitiveRestart;
  
      Debug mDebug;
  
      bool mMultiSampling;
      bool mSampleAlphaToOne;
  
      GLenum mCoverageModulation;
  
      // CHROMIUM_path_rendering
      GLfloat mPathMatrixMV[16];
      GLfloat mPathMatrixProj[16];
      GLenum mPathStencilFunc;
      GLint mPathStencilRef;
      GLuint mPathStencilMask;
  
      // GL_EXT_sRGB_write_control
      bool mFramebufferSRGB;
  
      // GL_ANGLE_robust_resource_intialization
      const bool mRobustResourceInit;
  
      // GL_ANGLE_program_cache_control
      const bool mProgramBinaryCacheEnabled;
  
      // GL_KHR_parallel_shader_compile
      GLuint mMaxShaderCompilerThreads;
  
      // GLES1 emulation: state specific to GLES1
      GLES1State mGLES1State;
  
      DirtyBits mDirtyBits;
      DirtyObjects mDirtyObjects;
      mutable AttributesMask mDirtyCurrentValues;
  };
  
  }  // namespace gl
  
  #endif  // LIBANGLE_STATE_H_