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 //

 // Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.

 // Use of this source code is governed by a BSD-style license that can be

 // found in the LICENSE file.

 //

 // RefCountObject.h: Defines the gl::RefCountObject base class that provides

 // lifecycle support for GL objects using the traditional BindObject scheme, but

 // that need to be reference counted for correct cross-context deletion.

 // (Concretely, textures, buffers and renderbuffers.)

 #ifndef COMMON_REFCOUNTOBJECT_H_

 #define COMMON_REFCOUNTOBJECT_H_

 #include <cstddef>

 #define GL_APICALL

 #include <GLES2/gl2.h>

 #include "common/debug.h"

 class RefCountObject

 {

   public:

     explicit RefCountObject(GLuint id);

     virtual ~RefCountObject();

     virtual void addRef() const;

     virtual void release() const;

     GLuint id() const { return mId; }

   private:

     GLuint mId;

     mutable std::size_t mRefCount;

 };

 class RefCountObjectBindingPointer

 {

   protected:

     RefCountObjectBindingPointer() : mObject(NULL) { }

     ~RefCountObjectBindingPointer() { ASSERT(mObject == NULL); } // Objects have to be released before the resource manager is destroyed, so they must be explicitly cleaned up.

     void set(RefCountObject *newObject);

     RefCountObject *get() const { return mObject; }

   public:

     GLuint id() const { return (mObject != NULL) ? mObject->id() : 0; }

     bool operator ! () const { return (get() == NULL); }

   private:

     RefCountObject *mObject;

 };

 template <class ObjectType>

 class BindingPointer : public RefCountObjectBindingPointer

 {

   public:

     void set(ObjectType *newObject) { RefCountObjectBindingPointer::set(newObject); }

     ObjectType *get() const { return static_cast<ObjectType*>(RefCountObjectBindingPointer::get()); }

     ObjectType *operator -> () const { return get(); }

 };

 #endif   // COMMON_REFCOUNTOBJECT_H_