Add support for glMapBufferRange. Use glMapBufferRange and glMapBufferSubData.

src/gpu/gl/GrGLAssembleInterface.cpp

 
 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLAssembleInterface.h"
@@ skipping 155 matching lines @@
     GET_PROC(Viewport);
     GET_PROC(BindFragDataLocationIndexed);
 
     if (glVer >= GR_GL_VER(3,0) || extensions.has("GL_ARB_vertex_array_object")) {
         // no ARB suffix for GL_ARB_vertex_array_object
         GET_PROC(BindVertexArray);
         GET_PROC(GenVertexArrays);
         GET_PROC(DeleteVertexArrays);
     }
 
+    if (glVer >= GR_GL_VER(3,0) || extensions.has("GL_ARB_map_buffer_range")) {
+        GET_PROC(MapBufferRange);
+        GET_PROC(FlushMappedBufferRange);
+    }
+
     // First look for GL3.0 FBO or GL_ARB_framebuffer_object (same since
     // GL_ARB_framebuffer_object doesn't use ARB suffix.)
     if (glVer >= GR_GL_VER(3,0) || extensions.has("GL_ARB_framebuffer_object")) {
         GET_PROC(GenFramebuffers);
         GET_PROC(GetFramebufferAttachmentParameteriv);
         GET_PROC(GetRenderbufferParameteriv);
         GET_PROC(BindFramebuffer);
         GET_PROC(FramebufferTexture2D);
         GET_PROC(CheckFramebufferStatus);
         GET_PROC(DeleteFramebuffers);
@@ skipping 94 matching lines @@
         GET_PROC(InvalidateSubFramebuffer);
         GET_PROC(InvalidateTexImage);
         GET_PROC(InvalidateTexSubImage);
     }
 
     interface->fStandard = kGL_GrGLStandard;
     interface->fExtensions.swap(&extensions);
 
     return interface;
 }