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_egl.h"
6
7 #include "ui/gl/gl_bindings.h"
8 #include "ui/gl/gl_context.h"
9
10 namespace gfx {
11
GLFenceEGL(bool flush)12 GLFenceEGL::GLFenceEGL(bool flush) {
13 display_ = eglGetCurrentDisplay();
14 sync_ = eglCreateSyncKHR(display_, EGL_SYNC_FENCE_KHR, NULL);
15 DCHECK(sync_ != EGL_NO_SYNC_KHR);
16 if (flush) {
17 glFlush();
18 } else {
19 flush_event_ = GLContext::GetCurrent()->SignalFlush();
20 }
21 }
22
HasCompleted()23 bool GLFenceEGL::HasCompleted() {
24 EGLint value = 0;
25 if (eglGetSyncAttribKHR(display_, sync_, EGL_SYNC_STATUS_KHR, &value) !=
26 EGL_TRUE) {
27 return true;
28 }
29
30 DCHECK(value == EGL_SIGNALED_KHR || value == EGL_UNSIGNALED_KHR);
31 return !value || value == EGL_SIGNALED_KHR;
32 }
33
ClientWait()34 void GLFenceEGL::ClientWait() {
35 if (!flush_event_.get() || flush_event_->IsSignaled()) {
36 EGLint flags = 0;
37 EGLTimeKHR time = EGL_FOREVER_KHR;
38 eglClientWaitSyncKHR(display_, sync_, flags, time);
39 } else {
40 LOG(ERROR) << "Trying to wait for uncommitted fence. Skipping...";
41 }
42 }
43
ServerWait()44 void GLFenceEGL::ServerWait() {
45 if (!gfx::g_driver_egl.ext.b_EGL_KHR_wait_sync) {
46 ClientWait();
47 return;
48 }
49 if (!flush_event_.get() || flush_event_->IsSignaled()) {
50 EGLint flags = 0;
51 eglWaitSyncKHR(display_, sync_, flags);
52 } else {
53 LOG(ERROR) << "Trying to wait for uncommitted fence. Skipping...";
54 }
55 }
56
~GLFenceEGL()57 GLFenceEGL::~GLFenceEGL() {
58 eglDestroySyncKHR(display_, sync_);
59 }
60
61 } // namespace gfx
62