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/egl_util.h"
   8 #include "ui/gl/gl_bindings.h"
   9
  10 namespace gfx {
  11
  12 namespace {
  13
  14 bool g_ignore_egl_sync_failures = false;
  15
  16 }  // namespace
  17
  18 // static
  19 void GLFenceEGL::SetIgnoreFailures() {
  20   g_ignore_egl_sync_failures = true;
  21 }
  22
  23 GLFenceEGL::GLFenceEGL() {
  24   display_ = eglGetCurrentDisplay();
  25   sync_ = eglCreateSyncKHR(display_, EGL_SYNC_FENCE_KHR, NULL);
  26   DCHECK(sync_ != EGL_NO_SYNC_KHR);
  27   glFlush();
  28 }
  29
  30 bool GLFenceEGL::HasCompleted() {
  31   EGLint value = 0;
  32   if (eglGetSyncAttribKHR(display_, sync_, EGL_SYNC_STATUS_KHR, &value) !=
  33       EGL_TRUE) {
  34     LOG(ERROR) << "Failed to get EGLSync attribute. error code:"
  35                << eglGetError();
  36     return true;
  37   }
  38
  39   DCHECK(value == EGL_SIGNALED_KHR || value == EGL_UNSIGNALED_KHR);
  40   return !value || value == EGL_SIGNALED_KHR;
  41 }
  42
  43 void GLFenceEGL::ClientWait() {
  44   EGLint flags = 0;
  45   EGLTimeKHR time = EGL_FOREVER_KHR;
  46   EGLint result = eglClientWaitSyncKHR(display_, sync_, flags, time);
  47   DCHECK_IMPLIES(!g_ignore_egl_sync_failures,
  48                  EGL_TIMEOUT_EXPIRED_KHR != result);
  49   if (result == EGL_FALSE) {
  50     LOG(ERROR) << "Failed to wait for EGLSync. error:"
  51                << ui::GetLastEGLErrorString();
  52     CHECK(g_ignore_egl_sync_failures);
  53   }
  54 }
  55
  56 void GLFenceEGL::ServerWait() {
  57   if (!gfx::g_driver_egl.ext.b_EGL_KHR_wait_sync) {
  58     ClientWait();
  59     return;
  60   }
  61   EGLint flags = 0;
  62   if (eglWaitSyncKHR(display_, sync_, flags) == EGL_FALSE) {
  63     LOG(ERROR) << "Failed to wait for EGLSync. error:"
  64                << ui::GetLastEGLErrorString();
  65     CHECK(g_ignore_egl_sync_failures);
  66   }
  67 }
  68
  69 GLFenceEGL::~GLFenceEGL() {
  70   eglDestroySyncKHR(display_, sync_);
  71 }
  72
  73 }  // namespace gfx