michael@0: //
michael@0: // Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: //
michael@0: 
michael@0: // RefCountObject.h: Defines the gl::RefCountObject base class that provides
michael@0: // lifecycle support for GL objects using the traditional BindObject scheme, but
michael@0: // that need to be reference counted for correct cross-context deletion.
michael@0: // (Concretely, textures, buffers and renderbuffers.)
michael@0: 
michael@0: #ifndef COMMON_REFCOUNTOBJECT_H_
michael@0: #define COMMON_REFCOUNTOBJECT_H_
michael@0: 
michael@0: #include <cstddef>
michael@0: 
michael@0: #define GL_APICALL
michael@0: #include <GLES2/gl2.h>
michael@0: 
michael@0: #include "common/debug.h"
michael@0: 
michael@0: class RefCountObject
michael@0: {
michael@0:   public:
michael@0:     explicit RefCountObject(GLuint id);
michael@0:     virtual ~RefCountObject();
michael@0: 
michael@0:     virtual void addRef() const;
michael@0:     virtual void release() const;
michael@0: 
michael@0:     GLuint id() const { return mId; }
michael@0:     
michael@0:   private:
michael@0:     GLuint mId;
michael@0: 
michael@0:     mutable std::size_t mRefCount;
michael@0: };
michael@0: 
michael@0: class RefCountObjectBindingPointer
michael@0: {
michael@0:   protected:
michael@0:     RefCountObjectBindingPointer() : mObject(NULL) { }
michael@0:     ~RefCountObjectBindingPointer() { ASSERT(mObject == NULL); } // Objects have to be released before the resource manager is destroyed, so they must be explicitly cleaned up.
michael@0: 
michael@0:     void set(RefCountObject *newObject);
michael@0:     RefCountObject *get() const { return mObject; }
michael@0: 
michael@0:   public:
michael@0:     GLuint id() const { return (mObject != NULL) ? mObject->id() : 0; }
michael@0:     bool operator ! () const { return (get() == NULL); }
michael@0: 
michael@0:   private:
michael@0:     RefCountObject *mObject;
michael@0: };
michael@0: 
michael@0: template <class ObjectType>
michael@0: class BindingPointer : public RefCountObjectBindingPointer
michael@0: {
michael@0:   public:
michael@0:     void set(ObjectType *newObject) { RefCountObjectBindingPointer::set(newObject); }
michael@0:     ObjectType *get() const { return static_cast<ObjectType*>(RefCountObjectBindingPointer::get()); }
michael@0:     ObjectType *operator -> () const { return get(); }
michael@0: };
michael@0: 
michael@0: #endif   // COMMON_REFCOUNTOBJECT_H_