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
30 namespace blink {
31
WebGLObject(WebGLRenderingContextBase *)32 WebGLObject::WebGLObject(WebGLRenderingContextBase*)
33 : m_object(0)
34 , m_attachmentCount(0)
35 , m_deleted(false)
36 {
37 }
38
~WebGLObject()39 WebGLObject::~WebGLObject()
40 {
41 // Verify that platform objects have been explicitly deleted.
42 ASSERT(m_deleted);
43 }
44
setObject(Platform3DObject object)45 void 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
deleteObject(blink::WebGraphicsContext3D * context3d)52 void 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
detach()72 void WebGLObject::detach()
73 {
74 m_attachmentCount = 0; // Make sure OpenGL resource is deleted.
75 }
76
detachAndDeleteObject()77 void 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
onDetached(blink::WebGraphicsContext3D * context3d)95 void WebGLObject::onDetached(blink::WebGraphicsContext3D* context3d)
96 {
97 if (m_attachmentCount)
98 --m_attachmentCount;
99 if (m_deleted)
100 deleteObject(context3d);
101 }
102
103 }
104