1/*
2 * Copyright (C) 2010 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 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef WebGLExtension_h
27#define WebGLExtension_h
28
29#include "core/html/canvas/WebGLExtensionName.h"
30#include "core/html/canvas/WebGLRenderingContextBase.h"
31#include "platform/heap/Handle.h"
32#include "wtf/RefCounted.h"
33
34namespace blink {
35
36class WebGLExtension : public RefCountedWillBeGarbageCollectedFinalized<WebGLExtension> {
37    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
38public:
39    WebGLRenderingContextBase* context() { return m_context; }
40
41    virtual ~WebGLExtension();
42    virtual WebGLExtensionName name() const = 0;
43
44    // Lose this extension. Passing true = force loss. Some extensions
45    // like WEBGL_lose_context are not normally lost when the context
46    // is lost but must be lost when destroying their WebGLRenderingContextBase.
47    virtual void lose(bool)
48    {
49        m_context = nullptr;
50    }
51
52    bool isLost()
53    {
54        return !m_context;
55    }
56
57    virtual void trace(Visitor*);
58
59protected:
60    explicit WebGLExtension(WebGLRenderingContextBase*);
61
62    RawPtrWillBeWeakMember<WebGLRenderingContextBase> m_context;
63};
64
65} // namespace blink
66
67#endif // WebGLExtension_h
68