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 #if defined(OS_MACOSX)
  17 #include "ui/gl/gl_fence_apple.h"
  18 #endif
  19
  20 namespace gfx {
  21
  22 namespace {
  23
  24 // static
  25 GLFence* CreateFence(bool flush) {
  26   DCHECK(GLContext::GetCurrent())
  27       << "Trying to create fence with no context";
  28
  29   scoped_ptr<GLFence> fence;
  30   // Prefer ARB_sync which supports server-side wait.
  31   if (g_driver_gl.ext.b_GL_ARB_sync ||
  32       GetGLVersionInfo()->is_es3) {
  33     fence.reset(new GLFenceARB(flush));
  34 #if defined(OS_MACOSX)
  35   } else if (g_driver_gl.ext.b_GL_APPLE_fence) {
  36     fence.reset(new GLFenceAPPLE(flush));
  37 #else
  38   } else if (g_driver_egl.ext.b_EGL_KHR_fence_sync) {
  39     fence.reset(new GLFenceEGL(flush));
  40 #endif
  41   } else if (g_driver_gl.ext.b_GL_NV_fence) {
  42     fence.reset(new GLFenceNV(flush));
  43   }
  44
  45   DCHECK_EQ(!!fence.get(), GLFence::IsSupported());
  46   return fence.release();
  47 }
  48
  49 }  // namespace
  50
  51 GLFence::GLFence() {
  52 }
  53
  54 GLFence::~GLFence() {
  55 }
  56
  57 bool GLFence::IsSupported() {
  58   DCHECK(GetGLVersionInfo());
  59   return g_driver_gl.ext.b_GL_ARB_sync || GetGLVersionInfo()->is_es3 ||
  60 #if defined(OS_MACOSX)
  61          g_driver_gl.ext.b_GL_APPLE_fence ||
  62 #else
  63          g_driver_egl.ext.b_EGL_KHR_fence_sync ||
  64 #endif
  65          g_driver_gl.ext.b_GL_NV_fence;
  66 }
  67
  68 GLFence* GLFence::Create() {
  69   return CreateFence(true);
  70 }
  71
  72 GLFence* GLFence::CreateWithoutFlush() {
  73   return CreateFence(false);
  74 }
  75
  76 }  // namespace gfx