1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "ui/gl/gl_fence_arb.h"
6
7#include "ui/gl/gl_bindings.h"
8#include "ui/gl/gl_context.h"
9
10namespace gfx {
11
12GLFenceARB::GLFenceARB(bool flush) {
13  sync_ = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
14  DCHECK_EQ(GL_TRUE, glIsSync(sync_));
15  if (flush) {
16    glFlush();
17  } else {
18    flush_event_ = GLContext::GetCurrent()->SignalFlush();
19  }
20}
21
22bool GLFenceARB::HasCompleted() {
23  // Handle the case where FenceSync failed.
24  if (!sync_)
25    return true;
26
27  DCHECK_EQ(GL_TRUE, glIsSync(sync_));
28  // We could potentially use glGetSynciv here, but it doesn't work
29  // on OSX 10.7 (always says the fence is not signaled yet).
30  // glClientWaitSync works better, so let's use that instead.
31  return glClientWaitSync(sync_, 0, 0) != GL_TIMEOUT_EXPIRED;
32}
33
34void GLFenceARB::ClientWait() {
35  DCHECK_EQ(GL_TRUE, glIsSync(sync_));
36  if (!flush_event_.get() || flush_event_->IsSignaled()) {
37    glClientWaitSync(sync_, GL_SYNC_FLUSH_COMMANDS_BIT, GL_TIMEOUT_IGNORED);
38  } else {
39    LOG(ERROR) << "Trying to wait for uncommitted fence. Skipping...";
40  }
41}
42
43void GLFenceARB::ServerWait() {
44  DCHECK_EQ(GL_TRUE, glIsSync(sync_));
45  if (!flush_event_.get() || flush_event_->IsSignaled()) {
46    glWaitSync(sync_, 0, GL_TIMEOUT_IGNORED);
47  } else {
48    LOG(ERROR) << "Trying to wait for uncommitted fence. Skipping...";
49  }
50}
51
52GLFenceARB::~GLFenceARB() {
53  DCHECK_EQ(GL_TRUE, glIsSync(sync_));
54  glDeleteSync(sync_);
55}
56
57}  // namespace gfx
58