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 "base/strings/stringprintf.h"
   8 #include "ui/gl/gl_bindings.h"
   9
  10 namespace gfx {
  11
  12 namespace {
  13
  14 std::string GetGLErrors() {
  15   // Clears and logs all current gl errors.
  16   std::string accumulated_errors;
  17   GLenum error;
  18   while ((error = glGetError()) != GL_NO_ERROR) {
  19     accumulated_errors += base::StringPrintf("0x%x ", error);
  20   }
  21   return accumulated_errors;
  22 }
  23
  24 }  // namespace
  25
  26 GLFenceARB::GLFenceARB() {
  27   sync_ = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
  28   DCHECK_EQ(GL_TRUE, glIsSync(sync_));
  29   glFlush();
  30 }
  31
  32 bool GLFenceARB::HasCompleted() {
  33   // Handle the case where FenceSync failed.
  34   if (!sync_)
  35     return true;
  36
  37   DCHECK_EQ(GL_TRUE, glIsSync(sync_));
  38   // We could potentially use glGetSynciv here, but it doesn't work
  39   // on OSX 10.7 (always says the fence is not signaled yet).
  40   // glClientWaitSync works better, so let's use that instead.
  41   GLenum result = glClientWaitSync(sync_, 0, 0);
  42   if (result == GL_WAIT_FAILED) {
  43     LOG(FATAL) << "Failed to wait for GLFence. error code:" << GetGLErrors();
  44   }
  45   return result != GL_TIMEOUT_EXPIRED;
  46 }
  47
  48 void GLFenceARB::ClientWait() {
  49   DCHECK_EQ(GL_TRUE, glIsSync(sync_));
  50   GLenum result =
  51       glClientWaitSync(sync_, GL_SYNC_FLUSH_COMMANDS_BIT, GL_TIMEOUT_IGNORED);
  52   DCHECK_NE(static_cast<GLenum>(GL_TIMEOUT_EXPIRED), result);
  53   if (result == GL_WAIT_FAILED) {
  54     LOG(FATAL) << "Failed to wait for GLFence. error code:" << GetGLErrors();
  55   }
  56 }
  57
  58 void GLFenceARB::ServerWait() {
  59   DCHECK_EQ(GL_TRUE, glIsSync(sync_));
  60   glWaitSync(sync_, 0, GL_TIMEOUT_IGNORED);
  61 }
  62
  63 GLFenceARB::~GLFenceARB() {
  64   DCHECK_EQ(GL_TRUE, glIsSync(sync_));
  65   glDeleteSync(sync_);
  66 }
  67
  68 }  // namespace gfx