command_buffer: Table based command dispatch for Common commands

gpu/command_buffer/service/common_decoder.h

 // Copyright (c) 2012 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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_COMMON_DECODER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_COMMON_DECODER_H_
 
 #include <map>
 #include <stack>
 #include <string>
@@ skipping 137 matching lines @@
       unsigned int arg_count,
       const void* cmd_data);
 
   // Gets an name for a common command.
   const char* GetCommonCommandName(cmd::CommandId command_id) const;
 
  private:
   // Generate a member function prototype for each command in an automated and
   // typesafe way.
   #define COMMON_COMMAND_BUFFER_CMD_OP(name)             \
-     error::Error Handle##name(                          \
-       uint32 immediate_data_size,                       \
-       const cmd::name& args);                           \
+     error::Error Handle##name(uint32 immediate_data_size, const void* data);
 
   COMMON_COMMAND_BUFFER_CMDS(COMMON_COMMAND_BUFFER_CMD_OP)
 
   #undef COMMON_COMMAND_BUFFER_CMD_OP
 
   CommandBufferEngine* engine_;
 
   typedef std::map<uint32, linked_ptr<Bucket> > BucketMap;
   BucketMap buckets_;
+
+  typedef Error (CommonDecoder::*CmdHandler)(
+      uint32 immediate_data_size,
+      const void* data);
+
+  // A struct to hold info about each command.
+  struct CommandInfo {
+    CmdHandler cmd_handler;
+    uint8 arg_flags;   // How to handle the arguments for this command
+    uint8 cmd_flags;   // How to handle this command
+    uint16 arg_count;  // How many arguments are expected for this command.
+  };
+
+  // A table of CommandInfo for all the commands.
+  static const CommandInfo command_info[];
+
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_COMMON_DECODER_H_