ui/gl/gl_fence_arb.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_arb.h"
   6
   7 #include "ui/gl/gl_bindings.h"
   8 #include "ui/gl/gl_context.h"
   9
  10 namespace gfx {
  11
  12 GLFenceARB::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
  22 bool 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
  34 void 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
  43 void 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
  52 GLFenceARB::~GLFenceARB() {
  53   DCHECK_EQ(GL_TRUE, glIsSync(sync_));
  54   glDeleteSync(sync_);
  55 }
  56
  57 }  // namespace gfx