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// Copyright (c) 2009 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"
#include <limits>
#include "base/callback.h"
#include "gpu/command_buffer/common/cmd_buffer_common.h"
using ::base::SharedMemory;
namespace gpu {
CommandBufferService::CommandBufferService()
: num_entries_(0),
get_offset_(0),
put_offset_(0),
token_(0),
error_(error::kNoError) {
// Element zero is always NULL.
registered_objects_.push_back(linked_ptr<SharedMemory>());
}
CommandBufferService::~CommandBufferService() {
}
bool CommandBufferService::Initialize(int32 size) {
// Fail if already initialized.
if (ring_buffer_.get()) {
LOG(ERROR) << "CommandBufferService::Initialize "
<< "failed because already initialized.";
return false;
}
if (size <= 0 || size > kMaxCommandBufferSize) {
LOG(ERROR) << "CommandBufferService::Initialize "
<< "because command buffer size was invalid.";
return false;
}
num_entries_ = size / sizeof(CommandBufferEntry);
ring_buffer_.reset(new SharedMemory);
if (ring_buffer_->CreateAndMapAnonymous(size)) {
return true;
}
num_entries_ = 0;
ring_buffer_.reset();
LOG(ERROR) << "CommandBufferService::Initialize failed because ring buffer "
<< "could not be created or mapped ";
return false;
}
Buffer CommandBufferService::GetRingBuffer() {
Buffer buffer;
if (ring_buffer_.get()) {
buffer.ptr = ring_buffer_->memory();
buffer.size = ring_buffer_->created_size();
buffer.shared_memory = ring_buffer_.get();
}
return buffer;
}
CommandBufferService::State CommandBufferService::GetState() {
State state;
state.num_entries = num_entries_;
state.get_offset = get_offset_;
state.put_offset = put_offset_;
state.token = token_;
state.error = error_;
return state;
}
CommandBufferService::State CommandBufferService::FlushSync(int32 put_offset) {
if (put_offset < 0 || put_offset > num_entries_) {
error_ = gpu::error::kOutOfBounds;
return GetState();
}
put_offset_ = put_offset;
if (put_offset_change_callback_.get()) {
put_offset_change_callback_->Run();
}
return GetState();
}
void CommandBufferService::Flush(int32 put_offset) {
FlushSync(put_offset);
}
void CommandBufferService::SetGetOffset(int32 get_offset) {
DCHECK(get_offset >= 0 && get_offset < num_entries_);
get_offset_ = get_offset;
}
int32 CommandBufferService::CreateTransferBuffer(size_t size) {
linked_ptr<SharedMemory> buffer(new SharedMemory);
if (!buffer->CreateAnonymous(size))
return -1;
if (unused_registered_object_elements_.empty()) {
// Check we haven't exceeded the range that fits in a 32-bit integer.
if (registered_objects_.size() > std::numeric_limits<uint32>::max())
return -1;
int32 handle = static_cast<int32>(registered_objects_.size());
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()));
}
}
Buffer CommandBufferService::GetTransferBuffer(int32 handle) {
if (handle < 0)
return Buffer();
if (static_cast<size_t>(handle) >= registered_objects_.size())
return Buffer();
base::SharedMemory* shared_memory = registered_objects_[handle].get();
if (!shared_memory)
return Buffer();
if (!shared_memory->memory()) {
if (!shared_memory->Map(shared_memory->created_size()))
return Buffer();
}
Buffer buffer;
buffer.ptr = shared_memory->memory();
buffer.size = shared_memory->created_size();
buffer.shared_memory = shared_memory;
return buffer;
}
void CommandBufferService::SetToken(int32 token) {
token_ = token;
}
void CommandBufferService::SetParseError(error::Error error) {
if (error_ == error::kNoError) {
error_ = error;
}
}
void CommandBufferService::SetPutOffsetChangeCallback(
Callback0::Type* callback) {
put_offset_change_callback_.reset(callback);
}
} // namespace gpu
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