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 GLFence::GLFence() {
  23 }
  24
  25 GLFence::~GLFence() {
  26 }
  27
  28 bool GLFence::IsSupported() {
  29   DCHECK(GetGLVersionInfo());
  30   return g_driver_gl.ext.b_GL_ARB_sync || GetGLVersionInfo()->is_es3 ||
  31 #if defined(OS_MACOSX)
  32          g_driver_gl.ext.b_GL_APPLE_fence ||
  33 #else
  34          g_driver_egl.ext.b_EGL_KHR_fence_sync ||
  35 #endif
  36          g_driver_gl.ext.b_GL_NV_fence;
  37 }
  38
  39 GLFence* GLFence::Create() {
  40   DCHECK(GLContext::GetCurrent())
  41       << "Trying to create fence with no context";
  42
  43   scoped_ptr<GLFence> fence;
  44   // Prefer ARB_sync which supports server-side wait.
  45   if (g_driver_gl.ext.b_GL_ARB_sync ||
  46       GetGLVersionInfo()->is_es3) {
  47     fence.reset(new GLFenceARB);
  48 #if defined(OS_MACOSX)
  49   } else if (g_driver_gl.ext.b_GL_APPLE_fence) {
  50     fence.reset(new GLFenceAPPLE);
  51 #else
  52   } else if (g_driver_egl.ext.b_EGL_KHR_fence_sync) {
  53     fence.reset(new GLFenceEGL);
  54 #endif
  55   } else if (g_driver_gl.ext.b_GL_NV_fence) {
  56     fence.reset(new GLFenceNV);
  57   }
  58
  59   DCHECK_EQ(!!fence.get(), GLFence::IsSupported());
  60   return fence.release();
  61 }
  62
  63 }  // namespace gfx