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      1 /*
      2  * Copyright (C) 2009 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef WebGLObject_h
     27 #define WebGLObject_h
     28 
     29 #include "platform/graphics/GraphicsTypes3D.h"
     30 #include "wtf/RefCounted.h"
     31 
     32 namespace blink {
     33 class WebGraphicsContext3D;
     34 }
     35 
     36 namespace WebCore {
     37 
     38 class WebGLContextGroup;
     39 class WebGLRenderingContextBase;
     40 
     41 class WebGLObject : public RefCounted<WebGLObject> {
     42 public:
     43     virtual ~WebGLObject();
     44 
     45     Platform3DObject object() const { return m_object; }
     46 
     47     // deleteObject may not always delete the OpenGL resource.  For programs and
     48     // shaders, deletion is delayed until they are no longer attached.
     49     // FIXME: revisit this when resource sharing between contexts are implemented.
     50     void deleteObject(blink::WebGraphicsContext3D*);
     51 
     52     void onAttached() { ++m_attachmentCount; }
     53     void onDetached(blink::WebGraphicsContext3D*);
     54 
     55     // This indicates whether the client side issue a delete call already, not
     56     // whether the OpenGL resource is deleted.
     57     // object()==0 indicates the OpenGL resource is deleted.
     58     bool isDeleted() { return m_deleted; }
     59 
     60     // True if this object belongs to the group or context.
     61     virtual bool validate(const WebGLContextGroup*, const WebGLRenderingContextBase*) const = 0;
     62 
     63 protected:
     64     WebGLObject(WebGLRenderingContextBase*);
     65 
     66     // setObject should be only called once right after creating a WebGLObject.
     67     void setObject(Platform3DObject);
     68 
     69     // deleteObjectImpl should be only called once to delete the OpenGL resource.
     70     virtual void deleteObjectImpl(blink::WebGraphicsContext3D*, Platform3DObject) = 0;
     71 
     72     virtual bool hasGroupOrContext() const = 0;
     73 
     74     virtual void detach();
     75 
     76     virtual blink::WebGraphicsContext3D* getAWebGraphicsContext3D() const = 0;
     77 
     78 private:
     79     Platform3DObject m_object;
     80     unsigned m_attachmentCount;
     81     bool m_deleted;
     82 };
     83 
     84 } // namespace WebCore
     85 
     86 #endif // WebGLObject_h
     87