Defer clearing textures and renderbuffers

gpu/command_buffer/service/renderbuffer_manager.h

 // Copyright (c) 2011 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 GPU_COMMAND_BUFFER_SERVICE_RENDERBUFFER_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_RENDERBUFFER_MANAGER_H_
 
 #include "base/basictypes.h"
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "gpu/command_buffer/service/gl_utils.h"
 
 namespace gpu {
 namespace gles2 {
 
 // This class keeps track of the renderbuffers and whether or not they have
 // been cleared.
 class RenderbufferManager {
  public:
   // Info about Renderbuffers currently in the system.
   class RenderbufferInfo : public base::RefCounted<RenderbufferInfo> {
    public:
     typedef scoped_refptr<RenderbufferInfo> Ref;
 
     explicit RenderbufferInfo(GLuint service_id)
         : service_id_(service_id),
-          cleared_(false),
+          cleared_(true),
           has_been_bound_(false),
           samples_(0),
           internal_format_(GL_RGBA4),
           width_(0),
           height_(0) {
     }
 
     GLuint service_id() const {
       return service_id_;
     }
 
     bool cleared() const {
       return cleared_;
     }
 
-    void set_cleared() {
-      cleared_ = true;
-    }
-
     GLenum internal_format() const {
       return internal_format_;
     }
 
     GLsizei samples() const {
       return samples_;
     }
 
     GLsizei width() const {
       return width_;
     }
 
     GLsizei height() const {
       return height_;
     }
 
-    void SetInfo(
-        GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height) {
-      samples_ = samples;
-      internal_format_ = internalformat;
-      width_ = width;
-      height_ = height;
-      cleared_ = false;
-    }
-
     bool IsDeleted() const {
       return service_id_ == 0;
     }
 
     void MarkAsValid() {
       has_been_bound_ = true;
     }
 
     bool IsValid() const {
       return has_been_bound_ && !IsDeleted();
     }
 
    private:
     friend class RenderbufferManager;
     friend class base::RefCounted<RenderbufferInfo>;
 
     ~RenderbufferInfo() { }
 
+    void set_cleared() {
+      cleared_ = true;
+    }
+
+    void SetInfo(
+        GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height) {
+      samples_ = samples;
+      internal_format_ = internalformat;
+      width_ = width;
+      height_ = height;
+      cleared_ = false;
+    }
+
     void MarkAsDeleted() {
       service_id_ = 0;
     }
 
     // Service side renderbuffer id.
     GLuint service_id_;
 
     // Whether this renderbuffer has been cleared
     bool cleared_;
 
@@ skipping 15 matching lines @@
   ~RenderbufferManager();
 
   GLint max_renderbuffer_size() const {
     return max_renderbuffer_size_;
   }
 
   GLint max_samples() const {
     return max_samples_;
   }
 
+  bool HaveUnclearedRenderbuffers() const {
+    return num_uncleared_renderbuffers_ != 0;
+  }
+
+  void SetInfo(
+      RenderbufferInfo* renderbuffer,
+      GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height);
+
+  void SetCleared(RenderbufferInfo* renderbuffer);
+
   // Must call before destruction.
   void Destroy(bool have_context);
 
   // Creates a RenderbufferInfo for the given renderbuffer.
   void CreateRenderbufferInfo(GLuint client_id, GLuint service_id);
 
   // Gets the renderbuffer info for the given renderbuffer.
   RenderbufferInfo* GetRenderbufferInfo(GLuint client_id);
 
   // Removes a renderbuffer info for the given renderbuffer.
   void RemoveRenderbufferInfo(GLuint client_id);
 
   // Gets a client id for a given service id.
   bool GetClientId(GLuint service_id, GLuint* client_id) const;
 
  private:
   GLint max_renderbuffer_size_;
   GLint max_samples_;
 
+  int num_uncleared_renderbuffers_;
+
   // Info for each renderbuffer in the system.
   typedef base::hash_map<GLuint, RenderbufferInfo::Ref> RenderbufferInfoMap;
   RenderbufferInfoMap renderbuffer_infos_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderbufferManager);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_RENDERBUFFER_MANAGER_H_