ui/gl/gl_fence.cc

   1 // Copyright (c) 2012 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.h"
   6
   7 #include "base/compiler_specific.h"
   8 #include "ui/gl/gl_bindings.h"
   9 #include "ui/gl/gl_context.h"
  10 #include "ui/gl/gl_fence_arb.h"
  11 #include "ui/gl/gl_fence_egl.h"
  12 #include "ui/gl/gl_fence_nv.h"
  13 #include "ui/gl/gl_gl_api_implementation.h"
  14 #include "ui/gl/gl_version_info.h"
  15
  16 namespace gfx {
  17
  18 namespace {
  19
  20 // static
  21 GLFence* CreateFence(bool flush) {
  22   DCHECK(GLContext::GetCurrent())
  23       << "Trying to create fence with no context";
  24
  25   scoped_ptr<GLFence> fence;
  26   // Prefer ARB_sync which supports server-side wait.
  27   if (g_driver_gl.ext.b_GL_ARB_sync ||
  28       GetGLVersionInfo()->is_es3) {
  29     fence.reset(new GLFenceARB(flush));
  30 #if !defined(OS_MACOSX)
  31   } else if (g_driver_egl.ext.b_EGL_KHR_fence_sync) {
  32     fence.reset(new GLFenceEGL(flush));
  33 #endif
  34   } else if (g_driver_gl.ext.b_GL_NV_fence) {
  35     fence.reset(new GLFenceNV(flush));
  36   }
  37
  38   DCHECK_EQ(!!fence.get(), GLFence::IsSupported());
  39   return fence.release();
  40 }
  41
  42 }  // namespace
  43
  44 GLFence::GLFence() {
  45 }
  46
  47 GLFence::~GLFence() {
  48 }
  49
  50 bool GLFence::IsSupported() {
  51   DCHECK(GetGLVersionInfo());
  52   return g_driver_gl.ext.b_GL_ARB_sync || GetGLVersionInfo()->is_es3 ||
  53 #if !defined(OS_MACOSX)
  54          g_driver_egl.ext.b_EGL_KHR_fence_sync ||
  55 #endif
  56          g_driver_gl.ext.b_GL_NV_fence;
  57 }
  58
  59 GLFence* GLFence::Create() {
  60   return CreateFence(true);
  61 }
  62
  63 GLFence* GLFence::CreateWithoutFlush() {
  64   return CreateFence(false);
  65 }
  66
  67 }  // namespace gfx