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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/gpu_processor.h"
#include "app/gfx/gl/gl_bindings.h"
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/message_loop.h"
#include "app/gfx/gl/gl_context.h"
#include "gpu/common/gpu_trace_event.h"
using ::base::SharedMemory;
static size_t kNumThrottleFences = 1;
namespace gpu {
GPUProcessor::GPUProcessor(CommandBuffer* command_buffer,
gles2::ContextGroup* group)
: command_buffer_(command_buffer),
commands_per_update_(100),
num_throttle_fences_(0),
#if defined(OS_MACOSX)
swap_buffers_count_(0),
acknowledged_swap_buffers_count_(0),
#endif
method_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
DCHECK(command_buffer);
decoder_.reset(gles2::GLES2Decoder::Create(group));
decoder_->set_engine(this);
}
GPUProcessor::GPUProcessor(CommandBuffer* command_buffer,
gles2::GLES2Decoder* decoder,
CommandParser* parser,
int commands_per_update)
: command_buffer_(command_buffer),
commands_per_update_(commands_per_update),
num_throttle_fences_(0),
#if defined(OS_MACOSX)
swap_buffers_count_(0),
acknowledged_swap_buffers_count_(0),
#endif
method_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
DCHECK(command_buffer);
decoder_.reset(decoder);
parser_.reset(parser);
}
GPUProcessor::~GPUProcessor() {
Destroy();
}
bool GPUProcessor::InitializeCommon(
gfx::GLContext* context,
const gfx::Size& size,
const gles2::DisallowedExtensions& disallowed_extensions,
const char* allowed_extensions,
const std::vector<int32>& attribs,
gles2::GLES2Decoder* parent_decoder,
uint32 parent_texture_id) {
DCHECK(context);
if (!context->MakeCurrent())
return false;
// If the NV_fence extension is present, use fences to defer the issue of
// commands once a certain fixed number of frames have been rendered.
num_throttle_fences_ =
context->HasExtension("GL_NV_fence") ? kNumThrottleFences : 0;
// Do not limit to a certain number of commands before scheduling another
// update when rendering onscreen.
if (!context->IsOffscreen())
commands_per_update_ = INT_MAX;
// Map the ring buffer and create the parser.
Buffer ring_buffer = command_buffer_->GetRingBuffer();
if (ring_buffer.ptr) {
parser_.reset(new CommandParser(ring_buffer.ptr,
ring_buffer.size,
0,
ring_buffer.size,
0,
decoder_.get()));
} else {
parser_.reset(new CommandParser(NULL, 0, 0, 0, 0,
decoder_.get()));
}
// Initialize the decoder with either the view or pbuffer GLContext.
if (!decoder_->Initialize(context,
size,
disallowed_extensions,
allowed_extensions,
attribs,
parent_decoder,
parent_texture_id)) {
LOG(ERROR) << "GPUProcessor::InitializeCommon failed because decoder "
<< "failed to initialize.";
Destroy();
return false;
}
return true;
}
void GPUProcessor::DestroyCommon() {
bool have_context = false;
if (decoder_.get()) {
have_context = decoder_->MakeCurrent();
decoder_->Destroy();
decoder_.reset();
}
parser_.reset();
}
#if defined(OS_MACOSX)
namespace {
const unsigned int kMaxOutstandingSwapBuffersCallsPerOnscreenContext = 1;
}
#endif
void GPUProcessor::ProcessCommands() {
GPU_TRACE_EVENT0("gpu", "GPUProcessor:ProcessCommands");
CommandBuffer::State state = command_buffer_->GetState();
if (state.error != error::kNoError)
return;
if (decoder_.get()) {
if (!decoder_->MakeCurrent()) {
LOG(ERROR) << "Context lost because MakeCurrent failed.";
command_buffer_->SetParseError(error::kLostContext);
return;
}
}
parser_->set_put(state.put_offset);
#if defined(OS_MACOSX)
bool do_rate_limiting = surface_.get() != NULL;
// Don't swamp the browser process with SwapBuffers calls it can't handle.
if (do_rate_limiting &&
swap_buffers_count_ - acknowledged_swap_buffers_count_ >=
kMaxOutstandingSwapBuffersCallsPerOnscreenContext) {
// Stop doing work on this command buffer. In the GPU process,
// receipt of the GpuMsg_AcceleratedSurfaceBuffersSwappedACK
// message causes ProcessCommands to be scheduled again.
return;
}
#endif
// Defer this command until the fence queue is not full.
while (num_throttle_fences_ > 0 &&
throttle_fences_.size() >= num_throttle_fences_) {
GLuint fence = throttle_fences_.front();
if (!glTestFenceNV(fence)) {
ScheduleProcessCommands();
return;
}
glDeleteFencesNV(1, &fence);
throttle_fences_.pop();
}
int commands_processed = 0;
while (commands_processed < commands_per_update_ && !parser_->IsEmpty()) {
error::Error error = parser_->ProcessCommand();
// If the command indicated it should be throttled, insert a new fence into
// the fence queue.
if (error == error::kThrottle) {
if (num_throttle_fences_ > 0 &&
throttle_fences_.size() < num_throttle_fences_) {
GLuint fence;
glGenFencesNV(1, &fence);
glSetFenceNV(fence, GL_ALL_COMPLETED_NV);
throttle_fences_.push(fence);
// Neither glTestFenceNV or glSetFenceNV are guaranteed to flush.
// Without an explicit flush, the glTestFenceNV loop might never
// make progress.
glFlush();
break;
}
} else if (error != error::kNoError) {
command_buffer_->SetParseError(error);
return;
}
++commands_processed;
}
command_buffer_->SetGetOffset(static_cast<int32>(parser_->get()));
if (!parser_->IsEmpty()) {
ScheduleProcessCommands();
}
}
void GPUProcessor::ScheduleProcessCommands() {
MessageLoop::current()->PostTask(
FROM_HERE,
method_factory_.NewRunnableMethod(&GPUProcessor::ProcessCommands));
}
Buffer GPUProcessor::GetSharedMemoryBuffer(int32 shm_id) {
return command_buffer_->GetTransferBuffer(shm_id);
}
void GPUProcessor::set_token(int32 token) {
command_buffer_->SetToken(token);
}
bool GPUProcessor::SetGetOffset(int32 offset) {
if (parser_->set_get(offset)) {
command_buffer_->SetGetOffset(static_cast<int32>(parser_->get()));
return true;
}
return false;
}
int32 GPUProcessor::GetGetOffset() {
return parser_->get();
}
void GPUProcessor::ResizeOffscreenFrameBuffer(const gfx::Size& size) {
decoder_->ResizeOffscreenFrameBuffer(size);
}
void GPUProcessor::SetResizeCallback(Callback1<gfx::Size>::Type* callback) {
decoder_->SetResizeCallback(callback);
}
void GPUProcessor::SetSwapBuffersCallback(
Callback0::Type* callback) {
wrapped_swap_buffers_callback_.reset(callback);
decoder_->SetSwapBuffersCallback(
NewCallback(this,
&GPUProcessor::WillSwapBuffers));
}
} // namespace gpu
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