Defer clearing textures and renderbuffers

gpu/command_buffer/service/renderbuffer_manager.cc

 // 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.
 
 #include "gpu/command_buffer/service/renderbuffer_manager.h"
 #include "base/logging.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 namespace gpu {
 namespace gles2 {
 
 RenderbufferManager::RenderbufferManager(
     GLint max_renderbuffer_size, GLint max_samples)
     : max_renderbuffer_size_(max_renderbuffer_size),
-      max_samples_(max_samples) {
+      max_samples_(max_samples),
+      num_uncleared_renderbuffers_(0)  {
 }
 
 RenderbufferManager::~RenderbufferManager() {
   DCHECK(renderbuffer_infos_.empty());
 }
 
 void RenderbufferManager::Destroy(bool have_context) {
   while (!renderbuffer_infos_.empty()) {
     if (have_context) {
       RenderbufferInfo* info = renderbuffer_infos_.begin()->second;
       if (!info->IsDeleted()) {
         GLuint service_id = info->service_id();
         glDeleteRenderbuffersEXT(1, &service_id);
         info->MarkAsDeleted();
       }
     }
     renderbuffer_infos_.erase(renderbuffer_infos_.begin());
   }
 }
 
+void RenderbufferManager::SetInfo(
+  RenderbufferInfo* renderbuffer,
+  GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height) {
+  DCHECK(renderbuffer);
+  if (!renderbuffer->cleared()) {
+    --num_uncleared_renderbuffers_;
+  }
+  renderbuffer->SetInfo(samples, internalformat, width, height);
+  if (!renderbuffer->cleared()) {
+    ++num_uncleared_renderbuffers_;
+  }
+}
+
+void RenderbufferManager::SetCleared(RenderbufferInfo* renderbuffer) {
+  DCHECK(renderbuffer);
+  if (!renderbuffer->cleared()) {
+    --num_uncleared_renderbuffers_;
+  }
+  renderbuffer->set_cleared();
+  if (!renderbuffer->cleared()) {
+    ++num_uncleared_renderbuffers_;
+  }
+}
+
 void RenderbufferManager::CreateRenderbufferInfo(
     GLuint client_id, GLuint service_id) {
+  RenderbufferInfo::Ref info(new RenderbufferInfo(service_id));
   std::pair<RenderbufferInfoMap::iterator, bool> result =
-      renderbuffer_infos_.insert(
-          std::make_pair(
-              client_id,
-              RenderbufferInfo::Ref(new RenderbufferInfo(service_id))));
+      renderbuffer_infos_.insert(std::make_pair(client_id, info));
   DCHECK(result.second);
+  if (!info->cleared()) {
+    ++num_uncleared_renderbuffers_;
+  }
 }
 
 RenderbufferManager::RenderbufferInfo* RenderbufferManager::GetRenderbufferInfo(
     GLuint client_id) {
   RenderbufferInfoMap::iterator it = renderbuffer_infos_.find(client_id);
   return it != renderbuffer_infos_.end() ? it->second : NULL;
 }
 
 void RenderbufferManager::RemoveRenderbufferInfo(GLuint client_id) {
   RenderbufferInfoMap::iterator it = renderbuffer_infos_.find(client_id);
   if (it != renderbuffer_infos_.end()) {
-    it->second->MarkAsDeleted();
+    RenderbufferInfo* info = it->second;
+    if (!info->cleared()) {
+      --num_uncleared_renderbuffers_;
+    }
+    info->MarkAsDeleted();
     renderbuffer_infos_.erase(it);
   }
 }
 
 bool RenderbufferManager::GetClientId(
     GLuint service_id, GLuint* client_id) const {
   // This doesn't need to be fast. It's only used during slow queries.
   for (RenderbufferInfoMap::const_iterator it = renderbuffer_infos_.begin();
        it != renderbuffer_infos_.end(); ++it) {
     if (it->second->service_id() == service_id) {
       *client_id = it->first;
       return true;
     }
   }
   return false;
 }
 
 }  // namespace gles2
 }  // namespace gpu