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 "bindings/v8/ScriptWrappable.h"
30#include "core/html/canvas/WebGLSharedObject.h"
31#include "core/html/canvas/WebGLShader.h"
32#include "wtf/PassRefPtr.h"
33#include "wtf/Vector.h"
34
35namespace WebCore {
36
37class WebGLProgram : public WebGLSharedObject, public ScriptWrappable {
38public:
39    virtual ~WebGLProgram();
40
41    static PassRefPtr<WebGLProgram> create(WebGLRenderingContext*);
42
43    unsigned numActiveAttribLocations();
44    GC3Dint getActiveAttribLocation(GC3Duint index);
45
46    bool isUsingVertexAttrib0();
47
48    bool getLinkStatus();
49    void setLinkStatus(bool);
50
51    unsigned getLinkCount() const { return m_linkCount; }
52
53    // This is to be called everytime after the program is successfully linked.
54    // We don't deal with integer overflow here, assuming in reality a program
55    // will never be linked so many times.
56    // Also, we invalidate the cached program info.
57    void increaseLinkCount();
58
59    WebGLShader* getAttachedShader(GC3Denum);
60    bool attachShader(WebGLShader*);
61    bool detachShader(WebGLShader*);
62
63protected:
64    WebGLProgram(WebGLRenderingContext*);
65
66    virtual void deleteObjectImpl(GraphicsContext3D*, Platform3DObject);
67
68private:
69    virtual bool isProgram() const { return true; }
70
71    void cacheActiveAttribLocations(GraphicsContext3D*);
72    void cacheInfoIfNeeded();
73
74    Vector<GC3Dint> m_activeAttribLocations;
75
76    GC3Dint m_linkStatus;
77
78    // This is used to track whether a WebGLUniformLocation belongs to this
79    // program or not.
80    unsigned m_linkCount;
81
82    RefPtr<WebGLShader> m_vertexShader;
83    RefPtr<WebGLShader> m_fragmentShader;
84
85    bool m_infoValid;
86};
87
88} // namespace WebCore
89
90#endif // WebGLProgram_h
91