Send vsync timebase updates to the browser compositor

cc/gl_renderer.h

 // Copyright 2010 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.
 
 
 #ifndef CCRendererGL_h
 #define CCRendererGL_h
 
 #include "base/basictypes.h"
 #include "CCCheckerboardDrawQuad.h"
@@ skipping 16 matching lines @@
 namespace cc {
 
 class CCScopedTexture;
 class GeometryBinding;
 class ScopedEnsureFramebufferAllocation;
 
 // Class that handles drawing of composited render layers using GL.
 class CCRendererGL : public CCDirectRenderer,
                      public WebKit::WebGraphicsContext3D::WebGraphicsSwapBuffersCompleteCallbackCHROMIUM,
                      public WebKit::WebGraphicsContext3D::WebGraphicsMemoryAllocationChangedCallbackCHROMIUM ,
+                     public WebKit::WebGraphicsContext3D::WebGraphicsUpdateVSyncTimeCallbackCHROMIUM,
                      public WebKit::WebGraphicsContext3D::WebGraphicsContextLostCallback {
 public:
     static scoped_ptr<CCRendererGL> create(CCRendererClient*, CCResourceProvider*);
 
     virtual ~CCRendererGL();
 
     virtual const RendererCapabilities& capabilities() const OVERRIDE;
 
     WebKit::WebGraphicsContext3D* context();
 
@@ skipping 67 matching lines @@
 
     // WebKit::WebGraphicsContext3D::WebGraphicsSwapBuffersCompleteCallbackCHROMIUM implementation.
     virtual void onSwapBuffersComplete() OVERRIDE;
 
     // WebKit::WebGraphicsContext3D::WebGraphicsMemoryAllocationChangedCallbackCHROMIUM implementation.
     virtual void onMemoryAllocationChanged(WebKit::WebGraphicsMemoryAllocation) OVERRIDE;
     void onMemoryAllocationChangedOnImplThread(WebKit::WebGraphicsMemoryAllocation);
     void discardFramebuffer();
     void ensureFramebuffer();
 
+    // WebKit::WebGraphicsContext3D::WebGraphicsUpdateVSyncTimeCallbackCHROMIUM implementation.
+    virtual void onUpdateVSyncTime(int64) OVERRIDE;

[piman, 2012/10/17 17:24:47]

There already is a mechanism to feed the vsync timing info into the compositor
(WebCompositorOutputSurfaceClient::onVSyncParametersChanged). Can we combine the
2?

[ajuma, 2012/10/17 21:15:23]

See the discussion in the WebKit bug for this issue
(https://bugs.webkit.org/show_bug.cgi?id=99592).

+
     // WebGraphicsContext3D::WebGraphicsContextLostCallback implementation.
     virtual void onContextLost() OVERRIDE;
 
     RendererCapabilities m_capabilities;
 
     unsigned m_offscreenFramebufferId;
 
     scoped_ptr<GeometryBinding> m_sharedGeometry;
     FloatQuad m_sharedGeometryQuad;
 
@@ skipping 92 matching lines @@
 #if DEBUG_GL_CALLS && !defined ( NDEBUG )
 #define GLC(context, x) (x, CCRendererGL::debugGLCall(&*context, #x, __FILE__, __LINE__))
 #else
 #define GLC(context, x) (x)
 #endif
 
 
 }
 
 #endif