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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 "core/platform/graphics/GraphicsContext3D.h"
     30 
     31 #include "wtf/RefCounted.h"
     32 
     33 namespace WebCore {
     34 
     35 class GraphicsContext3D;
     36 class WebGLContextGroup;
     37 class WebGLRenderingContext;
     38 
     39 class WebGLObject : public RefCounted<WebGLObject> {
     40 public:
     41     virtual ~WebGLObject();
     42 
     43     Platform3DObject object() const { return m_object; }
     44 
     45     // deleteObject may not always delete the OpenGL resource.  For programs and
     46     // shaders, deletion is delayed until they are no longer attached.
     47     // FIXME: revisit this when resource sharing between contexts are implemented.
     48     void deleteObject(GraphicsContext3D*);
     49 
     50     void onAttached() { ++m_attachmentCount; }
     51     void onDetached(GraphicsContext3D*);
     52 
     53     // This indicates whether the client side issue a delete call already, not
     54     // whether the OpenGL resource is deleted.
     55     // object()==0 indicates the OpenGL resource is deleted.
     56     bool isDeleted() { return m_deleted; }
     57 
     58     // True if this object belongs to the group or context.
     59     virtual bool validate(const WebGLContextGroup*, const WebGLRenderingContext*) const = 0;
     60 
     61 protected:
     62     WebGLObject(WebGLRenderingContext*);
     63 
     64     // setObject should be only called once right after creating a WebGLObject.
     65     void setObject(Platform3DObject);
     66 
     67     // deleteObjectImpl should be only called once to delete the OpenGL resource.
     68     virtual void deleteObjectImpl(GraphicsContext3D*, Platform3DObject) = 0;
     69 
     70     virtual bool hasGroupOrContext() const = 0;
     71 
     72     virtual void detach();
     73 
     74     virtual GraphicsContext3D* getAGraphicsContext3D() const = 0;
     75 
     76 private:
     77     Platform3DObject m_object;
     78     unsigned m_attachmentCount;
     79     bool m_deleted;
     80 };
     81 
     82 } // namespace WebCore
     83 
     84 #endif // WebGLObject_h
     85