Add support for glMapBufferRange. Use glMapBufferRange and glMapBufferSubData.

src/gpu/gl/iOS/GrGLCreateNativeInterface_iOS.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gl/GrGLInterface.h"
 
@@ skipping 114 matching lines @@
     functions->fGenRenderbuffers = glGenRenderbuffers;
     functions->fDeleteRenderbuffers = glDeleteRenderbuffers;
     functions->fFramebufferRenderbuffer = glFramebufferRenderbuffer;
     functions->fBindRenderbuffer = glBindRenderbuffer;
 
 #if GL_OES_mapbuffer
     functions->fMapBuffer = glMapBufferOES;
     functions->fUnmapBuffer = glUnmapBufferOES;
 #endif
 
+#if GL_EXT_map_buffer_range || GL_ES_VERSION_3_0
+    functions->fMapBufferRange = glMapBufferRangeEXT;
+    functions->fFlushMappedBufferRange = glFlushMappedBufferRangeEXT;
+#endif
+
 #if GL_APPLE_framebuffer_multisample
     functions->fRenderbufferStorageMultisample = glRenderbufferStorageMultisampleAPPLE;
     functions->fResolveMultisampleFramebuffer = glResolveMultisampleFramebufferAPPLE;
 #endif
 
 #if GL_OES_vertex_array_object
     functions->fBindVertexArray = glBindVertexArrayOES;
     functions->fDeleteVertexArrays = glDeleteVertexArraysOES;
     functions->fGenVertexArrays = glGenVertexArraysOES;
 #endif
@@ skipping 14 matching lines @@
     functions->fInvalidateBufferSubData = glInvalidateBufferSubData;
     functions->fInvalidateTexImage = glInvalidateTexImage;
     functions->fInvalidateTexSubImage = glInvalidateTexSubImage;
 #endif
 
     interface->fStandard = kGLES_GrGLStandard;
     interface->fExtensions.init(kGLES_GrGLStandard, glGetString, NULL, glGetIntegerv);
 
     return interface;
 }