text: // Modified from chromium/src/webkit/glue/gl_bindings_skia_cmd_buffer.cc
  
  // Copyright (c) 2011 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 "gl/GrGLInterface.h"
  
  #ifndef GL_GLEXT_PROTOTYPES
  #define GL_GLEXT_PROTOTYPES
  #endif
  
  #include <GLES2/gl2.h>
  #include <GLES2/gl2ext.h>
  
  #include <EGL/egl.h>
  
  const GrGLInterface* GrGLCreateNativeInterface() {
      static SkAutoTUnref<GrGLInterface> glInterface;
      if (!glInterface.get()) {
          GrGLInterface* interface = new GrGLInterface;
          glInterface.reset(interface);
          interface->fBindingsExported = kES2_GrGLBinding;
          interface->fActiveTexture = glActiveTexture;
          interface->fAttachShader = glAttachShader;
          interface->fBindAttribLocation = glBindAttribLocation;
          interface->fBindBuffer = glBindBuffer;
          interface->fBindTexture = glBindTexture;
          interface->fBindVertexArray = glBindVertexArrayOES;
          interface->fBlendColor = glBlendColor;
          interface->fBlendFunc = glBlendFunc;
          interface->fBufferData = glBufferData;
          interface->fBufferSubData = glBufferSubData;
          interface->fClear = glClear;
          interface->fClearColor = glClearColor;
          interface->fClearStencil = glClearStencil;
          interface->fColorMask = glColorMask;
          interface->fCompileShader = glCompileShader;
          interface->fCompressedTexImage2D = glCompressedTexImage2D;
          interface->fCopyTexSubImage2D = glCopyTexSubImage2D;
          interface->fCreateProgram = glCreateProgram;
          interface->fCreateShader = glCreateShader;
          interface->fCullFace = glCullFace;
          interface->fDeleteBuffers = glDeleteBuffers;
          interface->fDeleteProgram = glDeleteProgram;
          interface->fDeleteShader = glDeleteShader;
          interface->fDeleteTextures = glDeleteTextures;
          interface->fDeleteVertexArrays = glDeleteVertexArraysOES;
          interface->fDepthMask = glDepthMask;
          interface->fDisable = glDisable;
          interface->fDisableVertexAttribArray = glDisableVertexAttribArray;
          interface->fDrawArrays = glDrawArrays;
          interface->fDrawElements = glDrawElements;
          interface->fEnable = glEnable;
          interface->fEnableVertexAttribArray = glEnableVertexAttribArray;
          interface->fFinish = glFinish;
          interface->fFlush = glFlush;
          interface->fFrontFace = glFrontFace;
          interface->fGenBuffers = glGenBuffers;
          interface->fGenTextures = glGenTextures;
          interface->fGenVertexArrays = glGenVertexArraysOES;
          interface->fGetBufferParameteriv = glGetBufferParameteriv;
          interface->fGetError = glGetError;
          interface->fGetIntegerv = glGetIntegerv;
          interface->fGetProgramInfoLog = glGetProgramInfoLog;
          interface->fGetProgramiv = glGetProgramiv;
          interface->fGetShaderInfoLog = glGetShaderInfoLog;
          interface->fGetShaderiv = glGetShaderiv;
          interface->fGetString = glGetString;
          interface->fGetUniformLocation = glGetUniformLocation;
          interface->fLineWidth = glLineWidth;
          interface->fLinkProgram = glLinkProgram;
          interface->fPixelStorei = glPixelStorei;
          interface->fReadPixels = glReadPixels;
          interface->fScissor = glScissor;
  #if GR_GL_USE_NEW_SHADER_SOURCE_SIGNATURE
          interface->fShaderSource = (GrGLShaderSourceProc) glShaderSource;
  #else
          interface->fShaderSource = glShaderSource;
  #endif
          interface->fStencilFunc = glStencilFunc;
          interface->fStencilFuncSeparate = glStencilFuncSeparate;
          interface->fStencilMask = glStencilMask;
          interface->fStencilMaskSeparate = glStencilMaskSeparate;
          interface->fStencilOp = glStencilOp;
          interface->fStencilOpSeparate = glStencilOpSeparate;
          interface->fTexImage2D = glTexImage2D;
          interface->fTexParameteri = glTexParameteri;
          interface->fTexParameteriv = glTexParameteriv;
          interface->fTexSubImage2D = glTexSubImage2D;
  #if GL_ARB_texture_storage
          interface->fTexStorage2D = glTexStorage2D;
  #elif GL_EXT_texture_storage
          interface->fTexStorage2D = glTexStorage2DEXT;
  #else
          interface->fTexStorage2D = (GrGLTexStorage2DProc) eglGetProcAddress("glTexStorage2DEXT");
  #endif
          interface->fUniform1f = glUniform1f;
          interface->fUniform1i = glUniform1i;
          interface->fUniform1fv = glUniform1fv;
          interface->fUniform1iv = glUniform1iv;
          interface->fUniform2f = glUniform2f;
          interface->fUniform2i = glUniform2i;
          interface->fUniform2fv = glUniform2fv;
          interface->fUniform2iv = glUniform2iv;
          interface->fUniform3f = glUniform3f;
          interface->fUniform3i = glUniform3i;
          interface->fUniform3fv = glUniform3fv;
          interface->fUniform3iv = glUniform3iv;
          interface->fUniform4f = glUniform4f;
          interface->fUniform4i = glUniform4i;
          interface->fUniform4fv = glUniform4fv;
          interface->fUniform4iv = glUniform4iv;
          interface->fUniformMatrix2fv = glUniformMatrix2fv;
          interface->fUniformMatrix3fv = glUniformMatrix3fv;
          interface->fUniformMatrix4fv = glUniformMatrix4fv;
          interface->fUseProgram = glUseProgram;
          interface->fVertexAttrib4fv = glVertexAttrib4fv;
          interface->fVertexAttribPointer = glVertexAttribPointer;
          interface->fViewport = glViewport;
          interface->fBindFramebuffer = glBindFramebuffer;
          interface->fBindRenderbuffer = glBindRenderbuffer;
          interface->fCheckFramebufferStatus = glCheckFramebufferStatus;
          interface->fDeleteFramebuffers = glDeleteFramebuffers;
          interface->fDeleteRenderbuffers = glDeleteRenderbuffers;
          interface->fFramebufferRenderbuffer = glFramebufferRenderbuffer;
          interface->fFramebufferTexture2D = glFramebufferTexture2D;
  #if GL_IMG_multisampled_render_to_texture
  #ifndef SK_BUILD_FOR_ANDROID
          interface->fFramebufferTexture2DMultisample = glFramebufferTexture2DMultisampleIMG;
          interface->fRenderbufferStorageMultisample = glRenderbufferStorageMultisampleIMG;
  #endif
  #endif
          interface->fGenFramebuffers = glGenFramebuffers;
          interface->fGenRenderbuffers = glGenRenderbuffers;
          interface->fGetFramebufferAttachmentParameteriv = glGetFramebufferAttachmentParameteriv;
          interface->fGetRenderbufferParameteriv = glGetRenderbufferParameteriv;
          interface->fRenderbufferStorage = glRenderbufferStorage;
  #if GL_OES_mapbuffer
          interface->fMapBuffer = glMapBufferOES;
          interface->fUnmapBuffer = glUnmapBufferOES;
  #else
          interface->fMapBuffer = (GrGLMapBufferProc) eglGetProcAddress("glMapBufferOES");
          interface->fUnmapBuffer = (GrGLUnmapBufferProc) eglGetProcAddress("glUnmapBufferOES");
  #endif
      }
      glInterface.get()->ref();
      return glInterface.get();
  }
  