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 
~WebGLVertexArrayObjectOES()44     virtual ~WebGLVertexArrayObjectOES() { deleteObject(); }
45 
46     static PassRefPtr<WebGLVertexArrayObjectOES> create(WebGLRenderingContext*, VaoType);
47 
48     // Cached values for vertex attrib range checks
49     struct VertexAttribState {
VertexAttribStateVertexAttribState50         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 
isDefaultObject()73     bool isDefaultObject() const { return m_type == VaoTypeDefault; }
74 
hasEverBeenBound()75     bool hasEverBeenBound() const { return object() && m_hasEverBeenBound; }
setHasEverBeenBound()76     void setHasEverBeenBound() { m_hasEverBeenBound = true; }
77 
getElementArrayBuffer()78     PassRefPtr<WebGLBuffer> getElementArrayBuffer() const { return m_boundElementArrayBuffer; }
setElementArrayBuffer(PassRefPtr<WebGLBuffer> buffer)79     void setElementArrayBuffer(PassRefPtr<WebGLBuffer> buffer) { m_boundElementArrayBuffer = buffer; }
80 
getVertexAttribState(int index)81     VertexAttribState& getVertexAttribState(int index) { return m_vertexAttribState[index]; }
82 
83 private:
84     WebGLVertexArrayObjectOES(WebGLRenderingContext*, VaoType);
85 
86     virtual void deleteObjectImpl(Platform3DObject);
87 
isVertexArray()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