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// Copyright (c) 2006-2008 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.
#include "gpu/command_buffer/service/command_buffer_service.h"
using ::base::SharedMemory;
namespace command_buffer {
CommandBufferService::CommandBufferService()
: size_(0),
get_offset_(0),
put_offset_(0),
token_(0),
parse_error_(0),
error_status_(false) {
// Element zero is always NULL.
registered_objects_.push_back(linked_ptr<SharedMemory>());
}
CommandBufferService::~CommandBufferService() {
}
bool CommandBufferService::Initialize(::base::SharedMemory* ring_buffer) {
DCHECK(ring_buffer);
// Fail if already initialized.
if (ring_buffer_.get())
return false;
size_t size_in_bytes = ring_buffer->max_size();
size_ = size_in_bytes / sizeof(int32);
ring_buffer_.reset(ring_buffer);
return true;
}
SharedMemory* CommandBufferService::GetRingBuffer() {
return ring_buffer_.get();
}
int32 CommandBufferService::GetSize() {
return size_;
}
int32 CommandBufferService::SyncOffsets(int32 put_offset) {
if (put_offset < 0 || put_offset >= size_)
return -1;
put_offset_ = put_offset;
if (put_offset_change_callback_.get()) {
put_offset_change_callback_->Run();
}
return get_offset_;
}
int32 CommandBufferService::GetGetOffset() {
return get_offset_;
}
void CommandBufferService::SetGetOffset(int32 get_offset) {
DCHECK(get_offset >= 0 && get_offset < size_);
get_offset_ = get_offset;
}
int32 CommandBufferService::GetPutOffset() {
return put_offset_;
}
void CommandBufferService::SetPutOffsetChangeCallback(
Callback0::Type* callback) {
put_offset_change_callback_.reset(callback);
}
int32 CommandBufferService::CreateTransferBuffer(size_t size) {
linked_ptr<SharedMemory> buffer(new SharedMemory);
if (!buffer->Create(std::wstring(), false, false, size))
return -1;
if (unused_registered_object_elements_.empty()) {
// Check we haven't exceeded the range that fits in a 32-bit integer.
int32 handle = static_cast<int32>(registered_objects_.size());
if (handle != registered_objects_.size())
return -1;
registered_objects_.push_back(buffer);
return handle;
}
int32 handle = *unused_registered_object_elements_.begin();
unused_registered_object_elements_.erase(
unused_registered_object_elements_.begin());
DCHECK(!registered_objects_[handle].get());
registered_objects_[handle] = buffer;
return handle;
}
void CommandBufferService::DestroyTransferBuffer(int32 handle) {
if (handle <= 0)
return;
if (static_cast<size_t>(handle) >= registered_objects_.size())
return;
registered_objects_[handle].reset();
unused_registered_object_elements_.insert(handle);
// Remove all null objects from the end of the vector. This allows the vector
// to shrink when, for example, all objects are unregistered. Note that this
// loop never removes element zero, which is always NULL.
while (registered_objects_.size() > 1 && !registered_objects_.back().get()) {
registered_objects_.pop_back();
unused_registered_object_elements_.erase(
static_cast<int32>(registered_objects_.size()));
}
}
::base::SharedMemory* CommandBufferService::GetTransferBuffer(int32 handle) {
if (handle < 0)
return NULL;
if (static_cast<size_t>(handle) >= registered_objects_.size())
return NULL;
return registered_objects_[handle].get();
}
int32 CommandBufferService::GetToken() {
return token_;
}
void CommandBufferService::SetToken(int32 token) {
token_ = token;
}
int32 CommandBufferService::ResetParseError() {
int32 last_error = parse_error_;
parse_error_ = 0;
return last_error;
}
void CommandBufferService::SetParseError(int32 parse_error) {
if (parse_error_ == 0) {
parse_error_ = parse_error;
}
}
bool CommandBufferService::GetErrorStatus() {
return error_status_;
}
void CommandBufferService::RaiseErrorStatus() {
error_status_ = true;
}
} // namespace command_buffer
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