text: /*
   * Copyright (C) 2009 Apple Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
   */
  
  #ifndef WebGLObject_h
  #define WebGLObject_h
  
  #include "GraphicsContext3D.h"
  
  #include <wtf/PassRefPtr.h>
  #include <wtf/RefCounted.h>
  
  namespace WebCore {
  
  class WebGLRenderingContext;
  
  class WebGLObject : public RefCounted<WebGLObject> {
  public:
      virtual ~WebGLObject();
  
      Platform3DObject object() const { return m_object; }
  
      // deleteObject may not always delete the OpenGL resource.  For programs and
      // shaders, deletion is delayed until they are no longer attached.
      // FIXME: revisit this when resource sharing between contexts are implemented.
      void deleteObject();
  
      void detachContext();
  
      WebGLRenderingContext* context() const { return m_context; }
  
      virtual bool isBuffer() const { return false; }
      virtual bool isFramebuffer() const { return false; }
      virtual bool isProgram() const { return false; }
      virtual bool isRenderbuffer() const { return false; }
      virtual bool isShader() const { return false; }
      virtual bool isTexture() const { return false; }
  
      void onAttached() { ++m_attachmentCount; }
      void onDetached()
      {
          if (m_attachmentCount)
              --m_attachmentCount;
          if (m_deleted)
              deleteObject();
      }
  
      // This indicates whether the client side issue a delete call already, not
      // whether the OpenGL resource is deleted.
      // object()==0 indicates the OpenGL resource is deleted.
      bool isDeleted() { return m_deleted; }
  
  protected:
      WebGLObject(WebGLRenderingContext*);
  
      // setObject should be only called once right after creating a WebGLObject.
      void setObject(Platform3DObject);
  
      // deleteObjectImpl should be only called once to delete the OpenGL resource.
      virtual void deleteObjectImpl(Platform3DObject) = 0;
  
  private:
      Platform3DObject m_object;
      WebGLRenderingContext* m_context;
      unsigned m_attachmentCount;
      bool m_deleted;
  };
  
  } // namespace WebCore
  
  #endif // WebGLObject_h
  