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      1 /*
      2  * Copyright (C) 2011 Google 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 WebGLVertexArrayObjectOES_h
     27 #define WebGLVertexArrayObjectOES_h
     28 
     29 #include "WebGLBuffer.h"
     30 #include "WebGLObject.h"
     31 
     32 #include <wtf/PassRefPtr.h>
     33 #include <wtf/RefCounted.h>
     34 
     35 namespace WebCore {
     36 
     37 class WebGLVertexArrayObjectOES : public WebGLObject {
     38 public:
     39     enum VaoType {
     40         VaoTypeDefault,
     41         VaoTypeUser,
     42     };
     43 
     44     virtual ~WebGLVertexArrayObjectOES() { deleteObject(); }
     45 
     46     static PassRefPtr<WebGLVertexArrayObjectOES> create(WebGLRenderingContext*, VaoType);
     47 
     48     // Cached values for vertex attrib range checks
     49     struct VertexAttribState {
     50         VertexAttribState()
     51             : enabled(false)
     52             , bytesPerElement(0)
     53             , size(4)
     54             , type(GraphicsContext3D::FLOAT)
     55             , normalized(false)
     56             , stride(16)
     57             , originalStride(0)
     58             , offset(0)
     59         {
     60         }
     61 
     62         bool enabled;
     63         RefPtr<WebGLBuffer> bufferBinding;
     64         GC3Dsizei bytesPerElement;
     65         GC3Dint size;
     66         GC3Denum type;
     67         bool normalized;
     68         GC3Dsizei stride;
     69         GC3Dsizei originalStride;
     70         GC3Dintptr offset;
     71     };
     72 
     73     bool isDefaultObject() const { return m_type == VaoTypeDefault; }
     74 
     75     bool hasEverBeenBound() const { return object() && m_hasEverBeenBound; }
     76     void setHasEverBeenBound() { m_hasEverBeenBound = true; }
     77 
     78     PassRefPtr<WebGLBuffer> getElementArrayBuffer() const { return m_boundElementArrayBuffer; }
     79     void setElementArrayBuffer(PassRefPtr<WebGLBuffer> buffer) { m_boundElementArrayBuffer = buffer; }
     80 
     81     VertexAttribState& getVertexAttribState(int index) { return m_vertexAttribState[index]; }
     82 
     83 private:
     84     WebGLVertexArrayObjectOES(WebGLRenderingContext*, VaoType);
     85 
     86     virtual void deleteObjectImpl(Platform3DObject);
     87 
     88     virtual bool isVertexArray() const { return true; }
     89 
     90     VaoType m_type;
     91     bool m_hasEverBeenBound;
     92     RefPtr<WebGLBuffer> m_boundElementArrayBuffer;
     93     Vector<VertexAttribState> m_vertexAttribState;
     94 };
     95 
     96 } // namespace WebCore
     97 
     98 #endif // WebGLVertexArrayObjectOES_h
     99