wm: Add two pass rendering to OpenGL|ES backend.

gles/opengles_visitor.h

 // Copyright (c) 2010 The Chromium OS 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 WINDOW_MANAGER_GLES_GLES_VISITOR_H_
 #define WINDOW_MANAGER_GLES_GLES_VISITOR_H_
 
 #include <GLES2/gl2.h>
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
@@ skipping 27 matching lines @@
   }
   void set_damaged_region(Rect damaged_region) {
     NOTIMPLEMENTED();
   }
 
   void BindImage(const ImageContainer* container,
                  RealCompositor::QuadActor* actor);
 
   virtual void VisitActor(RealCompositor::Actor* actor) {}
   virtual void VisitStage(RealCompositor::StageActor* actor);
-  virtual void VisitContainer(RealCompositor::ContainerActor* actor);
-  virtual void VisitImage(RealCompositor::ImageActor* actor) {
-    VisitQuad(actor);
-  }
-  virtual void VisitTexturePixmap(RealCompositor::TexturePixmapActor* actor);
-  virtual void VisitQuad(RealCompositor::QuadActor* actor);
+
+  void DrawQuad(RealCompositor::QuadActor* actor,
+                float ancestor_opacity) const;
+  void CreateTextureData(RealCompositor::TexturePixmapActor *actor) const;
 
  private:
   Gles2Interface* gl_;  // Not owned.
   RealCompositor* compositor_;  // Not owned.
   Compositor::StageActor* stage_;  // Not owned.
   XConnection* x_connection_;  // Not owned.
 
   TexColorShader* tex_color_shader_;
   TexShadeShader* tex_shade_shader_;
   NoAlphaColorShader* no_alpha_color_shader_;
   NoAlphaShadeShader* no_alpha_shade_shader_;
 
   EGLDisplay egl_display_;
   EGLSurface egl_surface_;
   EGLContext egl_context_;
 
   // Matrix state
   Matrix4 projection_;
 
-  // Cumulative opacity of the ancestors
-  float ancestor_opacity_;
 
   // global vertex buffer object
   GLuint vertex_buffer_object_;
 
-  // Temporary storage for client side vertex colors
-  GLfloat colors_[4 * 4];
-
   // This is used to indicate whether the entire screen will be covered by an
   // actor so we can optimize by not clearing the COLOR_BUFFER_BIT.
   bool has_fullscreen_actor_;
 
   DISALLOW_COPY_AND_ASSIGN(OpenGlesDrawVisitor);
 };
 
 // TODO: further combine texture class between GL and GLES after common GL
 // functions are combined.
 class OpenGlesTextureData : public TextureData {
@@ skipping 31 matching lines @@
   Gles2Interface* gl_;
 
   // EGLImage
   EGLImageKHR egl_image_;
 };
 
 }  // namespace window_manager
 
 #endif  // WINDOW_MANAGER_GLES_GLES_VISITOR_H_