ui/gl/gl_fence_egl.cc

   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
  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
  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
  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
  44 void GLFenceEGL::ServerWait() {
  45   if (!flush_event_.get() || flush_event_->IsSignaled()) {
  46     EGLint flags = 0;
  47     eglWaitSyncKHR(display_, sync_, flags);
  48   } else {
  49     LOG(ERROR) << "Trying to wait for uncommitted fence. Skipping...";
  50   }
  51 }
  52
  53 GLFenceEGL::~GLFenceEGL() {
  54   eglDestroySyncKHR(display_, sync_);
  55 }
  56
  57 }  // namespace gfx