Reduce internal Flush() in GL resource glGen/Delete APIs.

gpu/command_buffer/client/share_group.h

 // Copyright (c) 2012 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_CLIENT_SHARE_GROUP_H_
 #define GPU_COMMAND_BUFFER_CLIENT_SHARE_GROUP_H_
 
 #include <GLES2/gl2.h>
 #include "base/memory/scoped_ptr.h"
 #include "gles2_impl_export.h"
 #include "gpu/command_buffer/client/ref_counted.h"
 #include "gpu/command_buffer/common/gles2_cmd_format.h"
 
 namespace gpu {
 namespace gles2 {
 
 class GLES2Implementation;
 class GLES2ImplementationTest;
 class ProgramInfoManager;
 
 typedef void (GLES2Implementation::*DeleteFn)(GLsizei n, const GLuint* ids);
 
+class ShareGroupContextData {
+ public:
+  struct IdHandlerData {
+    IdHandlerData();
+    ~IdHandlerData();
+
+    std::vector<GLuint> freed_ids_;
+    uint32 flush_generation_;
+  };
+
+  IdHandlerData* id_handler_data(int namespace_id) {
+    return &id_handler_data_[namespace_id];
+  }
+
+ private:
+  IdHandlerData id_handler_data_[id_namespaces::kNumIdNamespaces];
+};
+
 // Base class for IdHandlers
 class IdHandlerInterface {
  public:
   IdHandlerInterface() { }
   virtual ~IdHandlerInterface() { }
 
   // Makes some ids at or above id_offset.
   virtual void MakeIds(
       GLES2Implementation* gl_impl,
       GLuint id_offset, GLsizei n, GLuint* ids) = 0;
 
   // Frees some ids.
   virtual bool FreeIds(
       GLES2Implementation* gl_impl, GLsizei n, const GLuint* ids,
       DeleteFn delete_fn) = 0;
 
   // Marks an id as used for glBind functions. id = 0 does nothing.
-  virtual bool MarkAsUsedForBind(GLuint id) = 0;
+  virtual bool MarkAsUsedForBind(GLES2Implementation* gl_impl, GLuint id) = 0;
+
+  // Called when a context in the share group is destructed.
+  virtual void FreeContext(GLES2Implementation* gl_impl) = 0;
 };
 
 // ShareGroup manages shared resources for contexts that are sharing resources.
 class GLES2_IMPL_EXPORT ShareGroup
     : public gpu::RefCountedThreadSafe<ShareGroup> {
  public:
   ShareGroup(bool bind_generates_resource);
 
   bool bind_generates_resource() const {
     return bind_generates_resource_;
   }
 
   bool Initialize();
 
   IdHandlerInterface* GetIdHandler(int namespace_id) const {
     return id_handlers_[namespace_id].get();
   }
 
   ProgramInfoManager* program_info_manager() {
     return program_info_manager_.get();
   }
 
+  void FreeContext(GLES2Implementation* gl_impl) {
+    for (int i = 0; i < id_namespaces::kNumIdNamespaces; ++i) {
+      id_handlers_[i]->FreeContext(gl_impl);
+    }
+  }
+
  private:
   friend class gpu::RefCountedThreadSafe<ShareGroup>;
   friend class gpu::gles2::GLES2ImplementationTest;
   ~ShareGroup();
 
   // Install a new program info manager. Used for testing only;
   void set_program_info_manager(ProgramInfoManager* manager);
 
   scoped_ptr<IdHandlerInterface> id_handlers_[id_namespaces::kNumIdNamespaces];
   scoped_ptr<ProgramInfoManager> program_info_manager_;
 
   bool bind_generates_resource_;
 
   DISALLOW_COPY_AND_ASSIGN(ShareGroup);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_SHARE_GROUP_H_