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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.
*/
// This file contains the command parser class.
#ifndef GPU_COMMAND_BUFFER_SERVICE_CROSS_CMD_PARSER_H_
#define GPU_COMMAND_BUFFER_SERVICE_CROSS_CMD_PARSER_H_
#include "command_buffer/common/constants.h"
#include "command_buffer/common/cmd_buffer_common.h"
namespace command_buffer {
class AsyncAPIInterface;
// Command parser class. This class parses commands from a shared memory
// buffer, to implement some asynchronous RPC mechanism.
class CommandParser {
public:
CommandParser(void *shm_address,
size_t shm_size,
ptrdiff_t offset,
size_t size,
CommandBufferOffset start_get,
AsyncAPIInterface *handler);
// Gets the "get" pointer. The get pointer is an index into the command
// buffer considered as an array of CommandBufferEntry.
CommandBufferOffset get() const { return get_; }
// Sets the "put" pointer. The put pointer is an index into the command
// buffer considered as an array of CommandBufferEntry.
void set_put(CommandBufferOffset put) { put_ = put; }
// Gets the "put" pointer. The put pointer is an index into the command
// buffer considered as an array of CommandBufferEntry.
CommandBufferOffset put() const { return put_; }
// Checks whether there are commands to process.
bool IsEmpty() const { return put_ == get_; }
// Processes one command, updating the get pointer. This will return an error
// if there are no commands in the buffer.
parse_error::ParseError ProcessCommand();
// Processes all commands until get == put.
parse_error::ParseError ProcessAllCommands();
// Reports an error.
void ReportError(unsigned int command_id, parse_error::ParseError result);
private:
CommandBufferOffset get_;
CommandBufferOffset put_;
CommandBufferEntry *buffer_;
size_t entry_count_;
AsyncAPIInterface *handler_;
};
// This class defines the interface for an asynchronous API handler, that
// is responsible for de-multiplexing commands and their arguments.
class AsyncAPIInterface {
public:
AsyncAPIInterface() {}
virtual ~AsyncAPIInterface() {}
// Executes a 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.
virtual parse_error::ParseError DoCommand(
unsigned int command,
unsigned int arg_count,
const void* cmd_data) = 0;
// Returns a name for a command. Useful for logging / debuging.
virtual const char* GetCommandName(unsigned int command_id) const = 0;
};
} // namespace command_buffer
#endif // GPU_COMMAND_BUFFER_SERVICE_CROSS_CMD_PARSER_H_
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