gpu: Mailbox emulation with EGLImage

ui/gl/gl_fence.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gl/gl_fence.h"
 
 #include "base/compiler_specific.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
 
@@ skipping 18 matching lines @@
   }
 
   virtual bool HasCompleted() OVERRIDE {
     return !!glTestFenceNV(fence_);
   }
 
   virtual void ClientWait() OVERRIDE {
     glFinishFenceNV(fence_);
   }
 
+  virtual void ServerWait() OVERRIDE {
+    glFinishFenceNV(fence_);
+  }
+
  private:
   virtual ~GLFenceNVFence() {
     glDeleteFencesNV(1, &fence_);
   }
 
   GLuint fence_;
 };
 
 class GLFenceARBSync: public gfx::GLFence {
  public:
@@ skipping 10 matching lines @@
     // We could potentially use glGetSynciv here, but it doesn't work
     // on OSX 10.7 (always says the fence is not signaled yet).
     // glClientWaitSync works better, so let's use that instead.
     return  glClientWaitSync(sync_, 0, 0) != GL_TIMEOUT_EXPIRED;
   }
 
   virtual void ClientWait() OVERRIDE {
     glClientWaitSync(sync_, GL_SYNC_FLUSH_COMMANDS_BIT, GL_TIMEOUT_IGNORED);
   }
 
+  virtual void ServerWait() OVERRIDE {
+    glWaitSync(sync_, 0, GL_TIMEOUT_IGNORED);
+  }
+
  private:
   virtual ~GLFenceARBSync() {
     glDeleteSync(sync_);
   }
 
   GLsync sync_;
 };
 
 #if !defined(OS_MACOSX)
 class EGLFenceSync : public gfx::GLFence {
@@ skipping 10 matching lines @@
     DCHECK(value == EGL_SIGNALED_KHR || value == EGL_UNSIGNALED_KHR);
     return !value || value == EGL_SIGNALED_KHR;
   }
 
   virtual void ClientWait() OVERRIDE {
     EGLint flags = 0;
     EGLTimeKHR time = EGL_FOREVER_KHR;
     eglClientWaitSyncKHR(display_, sync_, flags, time);
   }
 
+  virtual void ServerWait() OVERRIDE {
+    EGLint flags = 0;
+    eglWaitSyncKHR(display_, sync_, flags);
+  }
+
+
  private:
   virtual ~EGLFenceSync() {
     eglDestroySyncKHR(display_, sync_);
   }
 
   EGLSyncKHR sync_;
   EGLDisplay display_;
 };
 #endif // !OS_MACOSX
 
@@ skipping 14 matching lines @@
     return new EGLFenceSync();
 #endif
   if (gfx::g_driver_gl.ext.b_GL_NV_fence)
     return new GLFenceNVFence();
   if (gfx::g_driver_gl.ext.b_GL_ARB_sync)
     return new GLFenceARBSync();
   return NULL;
 }
 
 }  // namespace gfx