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// 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.
// This file contains the command parser class.
#ifndef GPU_COMMAND_BUFFER_SERVICE_CMD_PARSER_H_
#define GPU_COMMAND_BUFFER_SERVICE_CMD_PARSER_H_
#include "gpu/command_buffer/common/constants.h"
#include "gpu/command_buffer/common/cmd_buffer_common.h"
#include "gpu/gpu_export.h"
namespace gpu {
class AsyncAPIInterface;
// Command parser class. This class parses commands from a shared memory
// buffer, to implement some asynchronous RPC mechanism.
class GPU_EXPORT CommandParser {
public:
explicit CommandParser(AsyncAPIInterface* handler);
// Sets the buffer to read commands from.
void SetBuffer(
void* shm_address,
size_t shm_size,
ptrdiff_t offset,
size_t size);
// 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 "get" pointer. The get pointer is an index into the command buffer
// considered as an array of CommandBufferEntry.
bool set_get(CommandBufferOffset get) {
if (get >= 0 && get < entry_count_) {
get_ = get;
return true;
}
return false;
}
// 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.
error::Error ProcessCommand();
// Processes all commands until get == put.
error::Error ProcessAllCommands();
// Reports an error.
void ReportError(unsigned int command_id, error::Error result);
private:
CommandBufferOffset get_;
CommandBufferOffset put_;
CommandBufferEntry* buffer_;
int32 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:
// error::kNoError if no error was found, one of
// error::Error otherwise.
virtual error::Error 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 gpu
#endif // GPU_COMMAND_BUFFER_SERVICE_CMD_PARSER_H_
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