GPUProcessor uses O3D command buffer service to render to a window....

o3d/command_buffer/service/cross/gapi_decoder.h

 /*
  * Copyright 2009, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 24 matching lines @@
 #ifndef O3D_COMMAND_BUFFER_SERVICE_CROSS_GAPI_DECODER_H_
 #define O3D_COMMAND_BUFFER_SERVICE_CROSS_GAPI_DECODER_H_
 
 #include "core/cross/types.h"
 #include "command_buffer/service/cross/cmd_parser.h"
 
 namespace o3d {
 namespace command_buffer {
 
 class GAPIInterface;
-class CommandBufferEngine;
+class CommandBufferUpcallInterface;
 
 // This class implements the AsyncAPIInterface interface, decoding GAPI
 // commands and sending them to a GAPI interface.
 class GAPIDecoder : public AsyncAPIInterface {
  public:
   typedef BufferSyncInterface::ParseError ParseError;
 
   explicit GAPIDecoder(GAPIInterface *gapi) : gapi_(gapi), engine_(NULL) {}
   virtual ~GAPIDecoder() {}
   // Executes a command.
   // Parameters:
   //    command: the command index.
   //    arg_count: the number of CommandBufferEntry arguments.
   //    args: the arguments.
   // Returns:
   //   BufferSyncInterface::NO_ERROR if no error was found, one of
   //   BufferSyncInterface::ParseError otherwise.
   virtual ParseError DoCommand(unsigned int command,
                                unsigned int arg_count,
                                const void* args);
 
   // Sets the engine, to get shared memory buffers from, and to set the token
   // to.
-  void set_engine(CommandBufferEngine *engine) { engine_ = engine; }
+  void set_engine(CommandBufferUpcallInterface *engine) { engine_ = engine; }
  private:
   // Decodes the SET_VERTEX_INPUT command.
   ParseError DecodeSetVertexInput(unsigned int arg_count,
                                   CommandBufferEntry *args);
 
   // Decodes the CREATE_TEXTURE_2D command.
   ParseError DecodeCreateTexture2D(unsigned int arg_count,
                                    CommandBufferEntry *args);
 
   // Decodes the CREATE_TEXTURE_3D command.
@@ skipping 47 matching lines @@
   #define O3D_COMMAND_BUFFER_CMD_OP(name) \
      ParseError Handle_ ## name(          \
        unsigned int arg_count,            \
        const cmd::name& args);            \
 
   O3D_COMMAND_BUFFER_CMDS
 
   #undef O3D_COMMAND_BUFFER_CMD_OP
 
   GAPIInterface *gapi_;
-  CommandBufferEngine *engine_;
+  CommandBufferUpcallInterface *engine_;
 };
 
 }  // namespace command_buffer
 }  // namespace o3d
 
 #endif  // O3D_COMMAND_BUFFER_SERVICE_CROSS_GAPI_DECODER_H_