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// Copyright (c) 2011 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_scheduler.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/compiler_specific.h"
#include "base/debug/trace_event.h"
#include "base/message_loop.h"
#include "base/time.h"
#include "ui/gfx/gl/gl_context.h"
#include "ui/gfx/gl/gl_bindings.h"
#include "ui/gfx/gl/gl_surface.h"
#include "ui/gfx/gl/gl_switches.h"
using ::base::SharedMemory;
namespace gpu {
namespace {
const uint64 kPollFencePeriod = 1;
}
GpuScheduler::GpuScheduler(CommandBuffer* command_buffer,
gles2::GLES2Decoder* decoder,
CommandParser* parser)
: command_buffer_(command_buffer),
decoder_(decoder),
parser_(parser),
unscheduled_count_(0) {
}
GpuScheduler::~GpuScheduler() {
}
void GpuScheduler::PutChanged() {
TRACE_EVENT1("gpu", "GpuScheduler:PutChanged", "this", this);
DCHECK(IsScheduled());
CommandBuffer::State state = command_buffer_->GetState();
parser_->set_put(state.put_offset);
if (state.error != error::kNoError)
return;
// Check that the GPU has passed all fences.
if (!unschedule_fences_.empty()) {
if (gfx::g_GL_NV_fence) {
while (!unschedule_fences_.empty()) {
if (glTestFenceNV(unschedule_fences_.front().fence)) {
glDeleteFencesNV(1, &unschedule_fences_.front().fence);
unschedule_fences_.front().task.Run();
unschedule_fences_.pop();
} else {
SetScheduled(false);
MessageLoop::current()->PostDelayedTask(
FROM_HERE,
base::Bind(&GpuScheduler::SetScheduled, AsWeakPtr(), true),
kPollFencePeriod);
return;
}
}
} else {
// Hopefully no recent drivers don't support GL_NV_fence and this will
// not happen in practice.
glFinish();
while (!unschedule_fences_.empty()) {
unschedule_fences_.front().task.Run();
unschedule_fences_.pop();
}
}
}
// One of the unschedule fence tasks might have unscheduled us.
if (!IsScheduled())
return;
error::Error error = error::kNoError;
while (!parser_->IsEmpty()) {
DCHECK(IsScheduled());
DCHECK(unschedule_fences_.empty());
error = parser_->ProcessCommand();
// TODO(piman): various classes duplicate various pieces of state, leading
// to needlessly complex update logic. It should be possible to simply
// share the state across all of them.
command_buffer_->SetGetOffset(static_cast<int32>(parser_->get()));
if (error::IsError(error)) {
command_buffer_->SetContextLostReason(decoder_->GetContextLostReason());
command_buffer_->SetParseError(error);
return;
}
if (!command_processed_callback_.is_null())
command_processed_callback_.Run();
if (unscheduled_count_ > 0)
return;
}
}
void GpuScheduler::SetScheduled(bool scheduled) {
TRACE_EVENT2("gpu", "GpuScheduler:SetScheduled", "this", this,
"new unscheduled_count_",
unscheduled_count_ + (scheduled? -1 : 1));
if (scheduled) {
--unscheduled_count_;
DCHECK_GE(unscheduled_count_, 0);
if (unscheduled_count_ == 0 && !scheduled_callback_.is_null())
scheduled_callback_.Run();
} else {
++unscheduled_count_;
}
}
bool GpuScheduler::IsScheduled() {
return unscheduled_count_ == 0;
}
void GpuScheduler::SetScheduledCallback(
const base::Closure& scheduled_callback) {
scheduled_callback_ = scheduled_callback;
}
Buffer GpuScheduler::GetSharedMemoryBuffer(int32 shm_id) {
return command_buffer_->GetTransferBuffer(shm_id);
}
void GpuScheduler::set_token(int32 token) {
command_buffer_->SetToken(token);
}
bool GpuScheduler::SetGetBuffer(int32 transfer_buffer_id) {
Buffer ring_buffer = command_buffer_->GetTransferBuffer(transfer_buffer_id);
if (!ring_buffer.ptr) {
return false;
}
if (!parser_.get()) {
parser_.reset(new CommandParser(decoder_));
}
parser_->SetBuffer(
ring_buffer.ptr,
ring_buffer.size,
0,
ring_buffer.size);
SetGetOffset(0);
return true;
}
bool GpuScheduler::SetGetOffset(int32 offset) {
if (parser_->set_get(offset)) {
command_buffer_->SetGetOffset(static_cast<int32>(parser_->get()));
return true;
}
return false;
}
int32 GpuScheduler::GetGetOffset() {
return parser_->get();
}
void GpuScheduler::SetCommandProcessedCallback(
const base::Closure& callback) {
command_processed_callback_ = callback;
}
void GpuScheduler::DeferToFence(base::Closure task) {
UnscheduleFence fence;
// What if either of these GL calls fails? TestFenceNV will return true and
// PutChanged will treat the fence as having been crossed and thereby not
// poll indefinately. See spec:
// http://www.opengl.org/registry/specs/NV/fence.txt
//
// What should happen if TestFenceNV is called for a name before SetFenceNV
// is called?
// We generate an INVALID_OPERATION error, and return TRUE.
// This follows the semantics for texture object names before
// they are bound, in that they acquire their state upon binding.
// We will arbitrarily return TRUE for consistency.
if (gfx::g_GL_NV_fence) {
glGenFencesNV(1, &fence.fence);
glSetFenceNV(fence.fence, GL_ALL_COMPLETED_NV);
}
glFlush();
fence.task = task;
unschedule_fences_.push(fence);
}
GpuScheduler::UnscheduleFence::UnscheduleFence() : fence(0) {
}
GpuScheduler::UnscheduleFence::~UnscheduleFence() {
}
} // namespace gpu
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