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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.
*/
#include "gpu/command_buffer/service/precompile.h"
#include "gpu/command_buffer/service/common_decoder.h"
#include "gpu/command_buffer/service/cmd_buffer_engine.h"
namespace command_buffer {
void* CommonDecoder::GetAddressAndCheckSize(unsigned int shm_id,
unsigned int offset,
unsigned int size) {
void* shm_addr = engine_->GetSharedMemoryAddress(shm_id);
if (!shm_addr) return NULL;
size_t shm_size = engine_->GetSharedMemorySize(shm_id);
unsigned int end = offset + size;
if (end > shm_size || end < offset) {
return NULL;
}
return static_cast<int8 *>(shm_addr) + offset;
}
const char* CommonDecoder::GetCommonCommandName(
cmd::CommandId command_id) const {
return cmd::GetCommandName(command_id);
}
namespace {
// A struct to hold info about each command.
struct CommandInfo {
int arg_flags; // How to handle the arguments for this command
int arg_count; // How many arguments are expected for this command.
};
// A table of CommandInfo for all the commands.
const CommandInfo g_command_info[] = {
#define COMMON_COMMAND_BUFFER_CMD_OP(name) { \
cmd::name::kArgFlags, \
sizeof(cmd::name) / sizeof(CommandBufferEntry) - 1, }, /* NOLINT */ \
COMMON_COMMAND_BUFFER_CMDS(COMMON_COMMAND_BUFFER_CMD_OP)
#undef COMMON_COMMAND_BUFFER_CMD_OP
};
} // anonymous namespace.
// Decode command with its arguments, and call the corresponding method.
// Note: args is a pointer to the command buffer. As such, it could be changed
// by a (malicious) client at any time, so if validation has to happen, it
// should operate on a copy of them.
parse_error::ParseError CommonDecoder::DoCommonCommand(
unsigned int command,
unsigned int arg_count,
const void* cmd_data) {
if (command < arraysize(g_command_info)) {
const CommandInfo& info = g_command_info[command];
unsigned int info_arg_count = static_cast<unsigned int>(info.arg_count);
if ((info.arg_flags == cmd::kFixed && arg_count == info_arg_count) ||
(info.arg_flags == cmd::kAtLeastN && arg_count >= info_arg_count)) {
switch (command) {
#define COMMON_COMMAND_BUFFER_CMD_OP(name) \
case cmd::name::kCmdId: \
return Handle ## name( \
arg_count, \
*static_cast<const cmd::name*>(cmd_data)); \
COMMON_COMMAND_BUFFER_CMDS(COMMON_COMMAND_BUFFER_CMD_OP)
#undef COMMON_COMMAND_BUFFER_CMD_OP
}
} else {
return parse_error::kParseInvalidArguments;
}
}
return DoCommonCommand(command, arg_count, cmd_data);
return parse_error::kParseUnknownCommand;
}
parse_error::ParseError CommonDecoder::HandleNoop(
uint32 arg_count,
const cmd::Noop& args) {
return parse_error::kParseNoError;
}
parse_error::ParseError CommonDecoder::HandleSetToken(
uint32 arg_count,
const cmd::SetToken& args) {
engine_->set_token(args.token);
return parse_error::kParseNoError;
}
} // namespace command_buffer
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