text: // Copyright 2013 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #include "gpu/skia_bindings/gl_bindings_skia_cmd_buffer.h"
  
  #include "base/logging.h"
  #include "gpu/command_buffer/client/context_support.h"
  #include "gpu/command_buffer/client/gles2_interface.h"
  #include "third_party/skia/include/gpu/gl/GrGLInterface.h"
  
  using gpu::gles2::GLES2Interface;
  using gpu::ContextSupport;
  
  namespace {
  
  class ScopedCallingGLFromSkia {
   public:
    ScopedCallingGLFromSkia(ContextSupport* context_support)
        : context_support_(context_support) {
      context_support_->WillCallGLFromSkia();
    }
    ~ScopedCallingGLFromSkia() { context_support_->DidCallGLFromSkia(); }
  
   private:
    ContextSupport* context_support_;
  };
  
  template <typename R, typename... Args>
  GrGLFunction<R GR_GL_FUNCTION_TYPE(Args...)> gles_bind(
      R (GLES2Interface::*func)(Args...),
      GLES2Interface* gles2_interface,
      ContextSupport* context_support) {
    if (context_support->HasGrContextSupport()) {
      return [func, context_support, gles2_interface](Args... args) {
        ScopedCallingGLFromSkia guard(context_support);
        return (gles2_interface->*func)(args...);
      };
    }
  
    // This fallback binding should only be used by unit tests which do not care
    // about GrContext::resetContext() getting called automatically.
    return [func, gles2_interface](Args... args) {
      return (gles2_interface->*func)(args...);
    };
  }
  }  // namespace
  
  namespace skia_bindings {
  
  sk_sp<GrGLInterface> CreateGLES2InterfaceBindings(
      GLES2Interface* impl,
      ContextSupport* context_support) {
    sk_sp<GrGLInterface> interface(new GrGLInterface);
    interface->fStandard = kGLES_GrGLStandard;
  
    // Allowing Skia to use GL ES 3.0 caused a perf test regression (see Issue
    // 719572). Until that can be understood we are limiting to ES 2.0 (with
    // extensions).
    auto get_string = [impl](GLenum name) {
      if (name == GL_VERSION)
        return reinterpret_cast<const GLubyte*>("OpenGL ES 2.0 Chromium");
      return impl->GetString(name);
    };
    auto get_stringi =
        gles_bind(&GLES2Interface::GetStringi, impl, context_support);
    auto get_integerv =
        gles_bind(&GLES2Interface::GetIntegerv, impl, context_support);
    interface->fExtensions.init(kGLES_GrGLStandard, get_string, get_stringi,
                                get_integerv);
  
    GrGLInterface::Functions* functions = &interface->fFunctions;
    functions->fActiveTexture =
        gles_bind(&GLES2Interface::ActiveTexture, impl, context_support);
    functions->fAttachShader =
        gles_bind(&GLES2Interface::AttachShader, impl, context_support);
    functions->fBindAttribLocation =
        gles_bind(&GLES2Interface::BindAttribLocation, impl, context_support);
    functions->fBindBuffer =
        gles_bind(&GLES2Interface::BindBuffer, impl, context_support);
    functions->fBindTexture =
        gles_bind(&GLES2Interface::BindTexture, impl, context_support);
    functions->fBindSampler =
        gles_bind(&GLES2Interface::BindSampler, impl, context_support);
    functions->fBindVertexArray =
        gles_bind(&GLES2Interface::BindVertexArrayOES, impl, context_support);
    functions->fBlendBarrier =
        gles_bind(&GLES2Interface::BlendBarrierKHR, impl, context_support);
    functions->fBlendColor =
        gles_bind(&GLES2Interface::BlendColor, impl, context_support);
    functions->fBlendEquation =
        gles_bind(&GLES2Interface::BlendEquation, impl, context_support);
    functions->fBlendFunc =
        gles_bind(&GLES2Interface::BlendFunc, impl, context_support);
    functions->fBufferData =
        gles_bind(&GLES2Interface::BufferData, impl, context_support);
    functions->fBufferSubData =
        gles_bind(&GLES2Interface::BufferSubData, impl, context_support);
    functions->fClear = gles_bind(&GLES2Interface::Clear, impl, context_support);
    functions->fClearColor =
        gles_bind(&GLES2Interface::ClearColor, impl, context_support);
    functions->fClearStencil =
        gles_bind(&GLES2Interface::ClearStencil, impl, context_support);
    functions->fClientWaitSync =
        gles_bind(&GLES2Interface::ClientWaitSync, impl, context_support);
    functions->fColorMask =
        gles_bind(&GLES2Interface::ColorMask, impl, context_support);
    functions->fCompileShader =
        gles_bind(&GLES2Interface::CompileShader, impl, context_support);
    functions->fCompressedTexImage2D =
        gles_bind(&GLES2Interface::CompressedTexImage2D, impl, context_support);
    functions->fCompressedTexSubImage2D = gles_bind(
        &GLES2Interface::CompressedTexSubImage2D, impl, context_support);
    functions->fCopyTexSubImage2D =
        gles_bind(&GLES2Interface::CopyTexSubImage2D, impl, context_support);
    functions->fCreateProgram =
        gles_bind(&GLES2Interface::CreateProgram, impl, context_support);
    functions->fCreateShader =
        gles_bind(&GLES2Interface::CreateShader, impl, context_support);
    functions->fCullFace =
        gles_bind(&GLES2Interface::CullFace, impl, context_support);
    functions->fDeleteBuffers =
        gles_bind(&GLES2Interface::DeleteBuffers, impl, context_support);
    functions->fDeleteProgram =
        gles_bind(&GLES2Interface::DeleteProgram, impl, context_support);
    functions->fDeleteSamplers =
        gles_bind(&GLES2Interface::DeleteSamplers, impl, context_support);
    functions->fDeleteShader =
        gles_bind(&GLES2Interface::DeleteShader, impl, context_support);
    functions->fDeleteSync =
        gles_bind(&GLES2Interface::DeleteSync, impl, context_support);
    functions->fDeleteTextures =
        gles_bind(&GLES2Interface::DeleteTextures, impl, context_support);
    functions->fDeleteVertexArrays =
        gles_bind(&GLES2Interface::DeleteVertexArraysOES, impl, context_support);
    functions->fDepthMask =
        gles_bind(&GLES2Interface::DepthMask, impl, context_support);
    functions->fDisable =
        gles_bind(&GLES2Interface::Disable, impl, context_support);
    functions->fDisableVertexAttribArray = gles_bind(
        &GLES2Interface::DisableVertexAttribArray, impl, context_support);
    functions->fDiscardFramebuffer =
        gles_bind(&GLES2Interface::DiscardFramebufferEXT, impl, context_support);
    functions->fDrawArrays =
        gles_bind(&GLES2Interface::DrawArrays, impl, context_support);
    functions->fDrawArraysInstanced = gles_bind(
        &GLES2Interface::DrawArraysInstancedANGLE, impl, context_support);
    functions->fDrawBuffers =
        gles_bind(&GLES2Interface::DrawBuffersEXT, impl, context_support);
    functions->fDrawElements =
        gles_bind(&GLES2Interface::DrawElements, impl, context_support);
    functions->fDrawElementsInstanced = gles_bind(
        &GLES2Interface::DrawElementsInstancedANGLE, impl, context_support);
    functions->fDrawRangeElements =
        gles_bind(&GLES2Interface::DrawRangeElements, impl, context_support);
    functions->fEnable =
        gles_bind(&GLES2Interface::Enable, impl, context_support);
    functions->fEnableVertexAttribArray = gles_bind(
        &GLES2Interface::EnableVertexAttribArray, impl, context_support);
    functions->fEndQuery =
        gles_bind(&GLES2Interface::EndQueryEXT, impl, context_support);
    functions->fFenceSync =
        gles_bind(&GLES2Interface::FenceSync, impl, context_support);
    functions->fFinish =
        gles_bind(&GLES2Interface::Finish, impl, context_support);
    functions->fFlush = gles_bind(&GLES2Interface::Flush, impl, context_support);
    functions->fFlushMappedBufferRange =
        gles_bind(&GLES2Interface::FlushMappedBufferRange, impl, context_support);
    functions->fFrontFace =
        gles_bind(&GLES2Interface::FrontFace, impl, context_support);
    functions->fGenBuffers =
        gles_bind(&GLES2Interface::GenBuffers, impl, context_support);
    functions->fGenSamplers =
        gles_bind(&GLES2Interface::GenSamplers, impl, context_support);
    functions->fGenTextures =
        gles_bind(&GLES2Interface::GenTextures, impl, context_support);
    functions->fGenVertexArrays =
        gles_bind(&GLES2Interface::GenVertexArraysOES, impl, context_support);
    functions->fGetBufferParameteriv =
        gles_bind(&GLES2Interface::GetBufferParameteriv, impl, context_support);
    functions->fGetError =
        gles_bind(&GLES2Interface::GetError, impl, context_support);
    functions->fGetIntegerv = get_integerv;
    functions->fGetInternalformativ =
        gles_bind(&GLES2Interface::GetInternalformativ, impl, context_support);
    functions->fGetProgramInfoLog =
        gles_bind(&GLES2Interface::GetProgramInfoLog, impl, context_support);
    functions->fGetProgramiv =
        gles_bind(&GLES2Interface::GetProgramiv, impl, context_support);
    functions->fGetQueryiv =
        gles_bind(&GLES2Interface::GetQueryivEXT, impl, context_support);
    functions->fGetQueryObjectuiv =
        gles_bind(&GLES2Interface::GetQueryObjectuivEXT, impl, context_support);
    functions->fGetShaderInfoLog =
        gles_bind(&GLES2Interface::GetShaderInfoLog, impl, context_support);
    functions->fGetShaderiv =
        gles_bind(&GLES2Interface::GetShaderiv, impl, context_support);
    functions->fGetShaderPrecisionFormat = gles_bind(
        &GLES2Interface::GetShaderPrecisionFormat, impl, context_support);
    functions->fGetString = get_string;
    functions->fGetStringi = get_stringi;
    functions->fGetUniformLocation =
        gles_bind(&GLES2Interface::GetUniformLocation, impl, context_support);
    functions->fInsertEventMarker =
        gles_bind(&GLES2Interface::InsertEventMarkerEXT, impl, context_support);
    functions->fInvalidateFramebuffer =
        gles_bind(&GLES2Interface::InvalidateFramebuffer, impl, context_support);
    functions->fInvalidateSubFramebuffer = gles_bind(
        &GLES2Interface::InvalidateSubFramebuffer, impl, context_support);
    functions->fIsSync =
        gles_bind(&GLES2Interface::IsSync, impl, context_support);
    functions->fIsTexture =
        gles_bind(&GLES2Interface::IsTexture, impl, context_support);
    functions->fLineWidth =
        gles_bind(&GLES2Interface::LineWidth, impl, context_support);
    functions->fLinkProgram =
        gles_bind(&GLES2Interface::LinkProgram, impl, context_support);
    functions->fMapBufferRange =
        gles_bind(&GLES2Interface::MapBufferRange, impl, context_support);
    functions->fMapBufferSubData = gles_bind(
        &GLES2Interface::MapBufferSubDataCHROMIUM, impl, context_support);
    functions->fMapTexSubImage2D = gles_bind(
        &GLES2Interface::MapTexSubImage2DCHROMIUM, impl, context_support);
    functions->fPixelStorei =
        gles_bind(&GLES2Interface::PixelStorei, impl, context_support);
    functions->fPopGroupMarker =
        gles_bind(&GLES2Interface::PopGroupMarkerEXT, impl, context_support);
    functions->fPushGroupMarker =
        gles_bind(&GLES2Interface::PushGroupMarkerEXT, impl, context_support);
    functions->fReadBuffer =
        gles_bind(&GLES2Interface::ReadBuffer, impl, context_support);
    functions->fReadPixels =
        gles_bind(&GLES2Interface::ReadPixels, impl, context_support);
    functions->fSamplerParameteri =
        gles_bind(&GLES2Interface::SamplerParameteri, impl, context_support);
    functions->fSamplerParameteriv =
        gles_bind(&GLES2Interface::SamplerParameteriv, impl, context_support);
    functions->fScissor =
        gles_bind(&GLES2Interface::Scissor, impl, context_support);
    functions->fShaderSource =
        gles_bind(&GLES2Interface::ShaderSource, impl, context_support);
    functions->fStencilFunc =
        gles_bind(&GLES2Interface::StencilFunc, impl, context_support);
    functions->fStencilFuncSeparate =
        gles_bind(&GLES2Interface::StencilFuncSeparate, impl, context_support);
    functions->fStencilMask =
        gles_bind(&GLES2Interface::StencilMask, impl, context_support);
    functions->fStencilMaskSeparate =
        gles_bind(&GLES2Interface::StencilMaskSeparate, impl, context_support);
    functions->fStencilOp =
        gles_bind(&GLES2Interface::StencilOp, impl, context_support);
    functions->fStencilOpSeparate =
        gles_bind(&GLES2Interface::StencilOpSeparate, impl, context_support);
    functions->fTexImage2D =
        gles_bind(&GLES2Interface::TexImage2D, impl, context_support);
    functions->fTexParameterf =
        gles_bind(&GLES2Interface::TexParameterf, impl, context_support);
    functions->fTexParameterfv =
        gles_bind(&GLES2Interface::TexParameterfv, impl, context_support);
    functions->fTexParameteri =
        gles_bind(&GLES2Interface::TexParameteri, impl, context_support);
    functions->fTexParameteriv =
        gles_bind(&GLES2Interface::TexParameteriv, impl, context_support);
    functions->fTexStorage2D =
        gles_bind(&GLES2Interface::TexStorage2DEXT, impl, context_support);
    functions->fTexSubImage2D =
        gles_bind(&GLES2Interface::TexSubImage2D, impl, context_support);
    functions->fUniform1f =
        gles_bind(&GLES2Interface::Uniform1f, impl, context_support);
    functions->fUniform1i =
        gles_bind(&GLES2Interface::Uniform1i, impl, context_support);
    functions->fUniform1fv =
        gles_bind(&GLES2Interface::Uniform1fv, impl, context_support);
    functions->fUniform1iv =
        gles_bind(&GLES2Interface::Uniform1iv, impl, context_support);
    functions->fUniform2f =
        gles_bind(&GLES2Interface::Uniform2f, impl, context_support);
    functions->fUniform2i =
        gles_bind(&GLES2Interface::Uniform2i, impl, context_support);
    functions->fUniform2fv =
        gles_bind(&GLES2Interface::Uniform2fv, impl, context_support);
    functions->fUniform2iv =
        gles_bind(&GLES2Interface::Uniform2iv, impl, context_support);
    functions->fUniform3f =
        gles_bind(&GLES2Interface::Uniform3f, impl, context_support);
    functions->fUniform3i =
        gles_bind(&GLES2Interface::Uniform3i, impl, context_support);
    functions->fUniform3fv =
        gles_bind(&GLES2Interface::Uniform3fv, impl, context_support);
    functions->fUniform3iv =
        gles_bind(&GLES2Interface::Uniform3iv, impl, context_support);
    functions->fUniform4f =
        gles_bind(&GLES2Interface::Uniform4f, impl, context_support);
    functions->fUniform4i =
        gles_bind(&GLES2Interface::Uniform4i, impl, context_support);
    functions->fUniform4fv =
        gles_bind(&GLES2Interface::Uniform4fv, impl, context_support);
    functions->fUniform4iv =
        gles_bind(&GLES2Interface::Uniform4iv, impl, context_support);
    functions->fUniformMatrix2fv =
        gles_bind(&GLES2Interface::UniformMatrix2fv, impl, context_support);
    functions->fUniformMatrix3fv =
        gles_bind(&GLES2Interface::UniformMatrix3fv, impl, context_support);
    functions->fUniformMatrix4fv =
        gles_bind(&GLES2Interface::UniformMatrix4fv, impl, context_support);
    functions->fUnmapBufferSubData = gles_bind(
        &GLES2Interface::UnmapBufferSubDataCHROMIUM, impl, context_support);
    functions->fUnmapTexSubImage2D = gles_bind(
        &GLES2Interface::UnmapTexSubImage2DCHROMIUM, impl, context_support);
    functions->fUseProgram =
        gles_bind(&GLES2Interface::UseProgram, impl, context_support);
    functions->fVertexAttrib1f =
        gles_bind(&GLES2Interface::VertexAttrib1f, impl, context_support);
    functions->fVertexAttrib2fv =
        gles_bind(&GLES2Interface::VertexAttrib2fv, impl, context_support);
    functions->fVertexAttrib3fv =
        gles_bind(&GLES2Interface::VertexAttrib3fv, impl, context_support);
    functions->fVertexAttrib4fv =
        gles_bind(&GLES2Interface::VertexAttrib4fv, impl, context_support);
    functions->fVertexAttribDivisor = gles_bind(
        &GLES2Interface::VertexAttribDivisorANGLE, impl, context_support);
    functions->fVertexAttribPointer =
        gles_bind(&GLES2Interface::VertexAttribPointer, impl, context_support);
    functions->fVertexAttribIPointer =
        gles_bind(&GLES2Interface::VertexAttribIPointer, impl, context_support);
    functions->fViewport =
        gles_bind(&GLES2Interface::Viewport, impl, context_support);
    functions->fWaitSync =
        gles_bind(&GLES2Interface::WaitSync, impl, context_support);
    functions->fBindFramebuffer =
        gles_bind(&GLES2Interface::BindFramebuffer, impl, context_support);
    functions->fBeginQuery =
        gles_bind(&GLES2Interface::BeginQueryEXT, impl, context_support);
    functions->fBindRenderbuffer =
        gles_bind(&GLES2Interface::BindRenderbuffer, impl, context_support);
    functions->fCheckFramebufferStatus =
        gles_bind(&GLES2Interface::CheckFramebufferStatus, impl, context_support);
    functions->fDeleteFramebuffers =
        gles_bind(&GLES2Interface::DeleteFramebuffers, impl, context_support);
    functions->fDeleteQueries =
        gles_bind(&GLES2Interface::DeleteQueriesEXT, impl, context_support);
    functions->fDeleteRenderbuffers =
        gles_bind(&GLES2Interface::DeleteRenderbuffers, impl, context_support);
    functions->fFramebufferRenderbuffer = gles_bind(
        &GLES2Interface::FramebufferRenderbuffer, impl, context_support);
    functions->fFramebufferTexture2D =
        gles_bind(&GLES2Interface::FramebufferTexture2D, impl, context_support);
    functions->fFramebufferTexture2DMultisample =
        gles_bind(&GLES2Interface::FramebufferTexture2DMultisampleEXT, impl,
                  context_support);
    functions->fGenFramebuffers =
        gles_bind(&GLES2Interface::GenFramebuffers, impl, context_support);
    functions->fGenRenderbuffers =
        gles_bind(&GLES2Interface::GenRenderbuffers, impl, context_support);
    functions->fGetFramebufferAttachmentParameteriv =
        gles_bind(&GLES2Interface::GetFramebufferAttachmentParameteriv, impl,
                  context_support);
    functions->fGetRenderbufferParameteriv = gles_bind(
        &GLES2Interface::GetRenderbufferParameteriv, impl, context_support);
    functions->fGenQueries =
        gles_bind(&GLES2Interface::GenQueriesEXT, impl, context_support);
    functions->fRenderbufferStorage =
        gles_bind(&GLES2Interface::RenderbufferStorage, impl, context_support);
    functions->fRenderbufferStorageMultisample =
        gles_bind(&GLES2Interface::RenderbufferStorageMultisampleCHROMIUM, impl,
                  context_support);
    functions->fRenderbufferStorageMultisampleES2EXT =
        gles_bind(&GLES2Interface::RenderbufferStorageMultisampleEXT, impl,
                  context_support);
    functions->fBindFragDataLocation = gles_bind(
        &GLES2Interface::BindFragDataLocationEXT, impl, context_support);
    functions->fBindFragDataLocationIndexed = gles_bind(
        &GLES2Interface::BindFragDataLocationIndexedEXT, impl, context_support);
    functions->fBindUniformLocation = gles_bind(
        &GLES2Interface::BindUniformLocationCHROMIUM, impl, context_support);
    functions->fBlitFramebuffer = gles_bind(
        &GLES2Interface::BlitFramebufferCHROMIUM, impl, context_support);
    functions->fGenerateMipmap =
        gles_bind(&GLES2Interface::GenerateMipmap, impl, context_support);
    functions->fCoverageModulation = gles_bind(
        &GLES2Interface::CoverageModulationCHROMIUM, impl, context_support);
    functions->fWindowRectangles =
        gles_bind(&GLES2Interface::WindowRectanglesEXT, impl, context_support);
    // Skia should not use program binaries over the command buffer. Allowing
    // clients to submit them would be unsafe, and we already cache program
    // binaries internally anyway.
    functions->fGetProgramBinary = [](GLuint, GLsizei, GLsizei*, GLenum*, void*) {
      LOG(FATAL) << "Skia shouldn't use program binaries over the command buffer";
    };
    functions->fProgramBinary = [](GLuint, GLenum, const void*, GLsizei) {
      LOG(FATAL) << "Skia shouldn't use program binaries over the command buffer";
    };
    functions->fProgramParameteri = [](GLuint, GLenum pname, GLint) {
      // This method is only used for GL_PROGRAM_BINARY_RETRIEVABLE_HINT in ES3.
      LOG(FATAL) << "Skia shouldn't use program binaries over the command buffer";
    };
    return interface;
  }
  
  }  // namespace skia_bindings
  