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 WebGLProgram_h
27#define WebGLProgram_h
28
29#include "WebGLSharedObject.h"
30
31#include "WebGLShader.h"
32
33#include <wtf/PassRefPtr.h>
34#include <wtf/RefCounted.h>
35#include <wtf/Vector.h>
36
37namespace WebCore {
38
39class WebGLProgram : public WebGLSharedObject {
40public:
41    virtual ~WebGLProgram();
42
43    static PassRefPtr<WebGLProgram> create(WebGLRenderingContext*);
44
45    unsigned numActiveAttribLocations();
46    GC3Dint getActiveAttribLocation(GC3Duint index);
47
48    bool isUsingVertexAttrib0();
49
50    bool getLinkStatus();
51    void setLinkStatus(bool);
52
53    unsigned getLinkCount() const { return m_linkCount; }
54
55    // This is to be called everytime after the program is successfully linked.
56    // We don't deal with integer overflow here, assuming in reality a program
57    // will never be linked so many times.
58    // Also, we invalidate the cached program info.
59    void increaseLinkCount();
60
61    WebGLShader* getAttachedShader(GC3Denum);
62    bool attachShader(WebGLShader*);
63    bool detachShader(WebGLShader*);
64
65protected:
66    WebGLProgram(WebGLRenderingContext*);
67
68    virtual void deleteObjectImpl(GraphicsContext3D*, Platform3DObject);
69
70private:
71    virtual bool isProgram() const { return true; }
72
73    void cacheActiveAttribLocations(GraphicsContext3D*);
74    void cacheInfoIfNeeded();
75
76    Vector<GC3Dint> m_activeAttribLocations;
77
78    GC3Dint m_linkStatus;
79
80    // This is used to track whether a WebGLUniformLocation belongs to this
81    // program or not.
82    unsigned m_linkCount;
83
84    RefPtr<WebGLShader> m_vertexShader;
85    RefPtr<WebGLShader> m_fragmentShader;
86
87    bool m_infoValid;
88};
89
90} // namespace WebCore
91
92#endif // WebGLProgram_h
93