Fix bug with render targets not getting restored correctly.

core/cross/renderer.cc

 /*
  * Copyright 2009, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 609 matching lines @@
     }
   }
   state_stack_.pop_back();
 }
 
 void Renderer::SetRenderSurfaces(RenderSurface* surface,
                                  RenderDepthStencilSurface* depth_surface) {
   if (surface != NULL || depth_surface != NULL) {
     SetRenderSurfacesPlatformSpecific(surface, depth_surface);
     current_render_surface_ = surface;
+    current_depth_surface_ = depth_surface;
     if (surface) {
       render_width_ = surface->width();
       render_height_ = surface->height();
     } else {
       render_width_ = depth_surface->width();
       render_height_ = depth_surface->height();
     }
   } else {
     SetBackBufferPlatformSpecific();
     current_render_surface_ = NULL;
+    current_depth_surface_ = NULL;
     render_width_ = width();
     render_height_ = height();
   }
   // We must reset the viewport after each change in surfaces.
   SetViewport(viewport_, depth_range_);
 }
 
 void Renderer::GetRenderSurfaces(RenderSurface** surface,
                                  RenderDepthStencilSurface** depth_surface) {
   DCHECK(surface);
   DCHECK(depth_surface);
   *surface = current_render_surface_;
   *depth_surface = current_depth_surface_;
 }
 
 bool Renderer::SafeToBindTexture(Texture* texture) const {
   if (current_render_surface_ &&
       current_render_surface_->texture() == texture) {
     return false;
   }
 
   return true;
 }
 
 }  // namespace o3d