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 58
