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#include "config.h"
27
28#include "core/html/canvas/WebGLObject.h"
29
30namespace blink {
31
32WebGLObject::WebGLObject(WebGLRenderingContextBase*)
33    : m_object(0)
34    , m_attachmentCount(0)
35    , m_deleted(false)
36{
37}
38
39WebGLObject::~WebGLObject()
40{
41    // Verify that platform objects have been explicitly deleted.
42    ASSERT(m_deleted);
43}
44
45void WebGLObject::setObject(Platform3DObject object)
46{
47    // object==0 && m_deleted==false indicating an uninitialized state;
48    ASSERT(!m_object && !m_deleted);
49    m_object = object;
50}
51
52void WebGLObject::deleteObject(blink::WebGraphicsContext3D* context3d)
53{
54    m_deleted = true;
55    if (!m_object)
56        return;
57
58    if (!hasGroupOrContext())
59        return;
60
61    if (!m_attachmentCount) {
62        if (!context3d)
63            context3d = getAWebGraphicsContext3D();
64
65        if (context3d)
66            deleteObjectImpl(context3d, m_object);
67
68        m_object = 0;
69    }
70}
71
72void WebGLObject::detach()
73{
74    m_attachmentCount = 0; // Make sure OpenGL resource is deleted.
75}
76
77void WebGLObject::detachAndDeleteObject()
78{
79    // Helper method that pairs detachment with platform object
80    // deletion.
81    //
82    // With Oilpan enabled, objects may end up being finalized without
83    // having been detached first. Consequently, the objects force
84    // detachment first before deleting the platform object. Without
85    // Oilpan, the objects will have been detached from the 'parent'
86    // objects first and do not separately require it when finalizing.
87    //
88    // However, as detach() is trivial, the individual WebGL
89    // destructors will always call detachAndDeleteObject() rather
90    // than do it based on Oilpan being enabled.
91    detach();
92    deleteObject(0);
93}
94
95void WebGLObject::onDetached(blink::WebGraphicsContext3D* context3d)
96{
97    if (m_attachmentCount)
98        --m_attachmentCount;
99    if (m_deleted)
100        deleteObject(context3d);
101}
102
103}
104