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/*
* 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.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef GPU_COMMAND_BUFFER_SERVICE_CROSS_COMMON_DECODER_H_
#define GPU_COMMAND_BUFFER_SERVICE_CROSS_COMMON_DECODER_H_
#include "gpu/command_buffer/service/cmd_parser.h"
namespace command_buffer {
class CommandBufferEngine;
// This class is a helper base class for implementing the common parts of the
// o3d/gl2 command buffer decoder.
class CommonDecoder : public AsyncAPIInterface {
public:
typedef parse_error::ParseError ParseError;
CommonDecoder() : engine_(NULL) {
}
virtual ~CommonDecoder() {
}
// Sets the engine, to get shared memory buffers from, and to set the token
// to.
void set_engine(CommandBufferEngine* engine) {
engine_ = engine;
}
protected:
// Executes a common command.
// Parameters:
// command: the command index.
// arg_count: the number of CommandBufferEntry arguments.
// cmd_data: the command data.
// Returns:
// parse_error::NO_ERROR if no error was found, one of
// parse_error::ParseError otherwise.
parse_error::ParseError DoCommonCommand(
unsigned int command,
unsigned int arg_count,
const void* cmd_data);
// Gets the address of shared memory data, given a shared memory ID and an
// offset. Also checks that the size is consistent with the shared memory
// size.
// Parameters:
// shm_id: the id of the shared memory buffer.
// offset: the offset of the data in the shared memory buffer.
// size: the size of the data.
// Returns:
// NULL if shm_id isn't a valid shared memory buffer ID or if the size
// check fails. Return a pointer to the data otherwise.
void* GetAddressAndCheckSize(unsigned int shm_id,
unsigned int offset,
unsigned int size);
// 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) \
parse_error::ParseError Handle ## name( \
unsigned int arg_count, \
const cmd::name& args); \
COMMON_COMMAND_BUFFER_CMDS(COMMON_COMMAND_BUFFER_CMD_OP)
#undef COMMON_COMMAND_BUFFER_CMD_OP
CommandBufferEngine* engine_;
};
} // namespace command_buffer
#endif // GPU_COMMAND_BUFFER_SERVICE_CROSS_COMMON_DECODER_H_
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