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      1 /*
      2  * Copyright (C) 2011 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/WebGLContextGroup.h"
     29 
     30 #include "core/html/canvas/WebGLRenderingContext.h"
     31 #include "core/html/canvas/WebGLSharedObject.h"
     32 
     33 namespace WebCore {
     34 
     35 PassRefPtr<WebGLContextGroup> WebGLContextGroup::create()
     36 {
     37     RefPtr<WebGLContextGroup> contextGroup = adoptRef(new WebGLContextGroup());
     38     return contextGroup.release();
     39 }
     40 
     41 WebGLContextGroup::WebGLContextGroup()
     42 {
     43 }
     44 
     45 WebGLContextGroup::~WebGLContextGroup()
     46 {
     47     detachAndRemoveAllObjects();
     48 }
     49 
     50 GraphicsContext3D* WebGLContextGroup::getAGraphicsContext3D()
     51 {
     52     ASSERT(!m_contexts.isEmpty());
     53     HashSet<WebGLRenderingContext*>::iterator it = m_contexts.begin();
     54     return (*it)->graphicsContext3D();
     55 }
     56 
     57 void WebGLContextGroup::addContext(WebGLRenderingContext* context)
     58 {
     59     m_contexts.add(context);
     60 }
     61 
     62 void WebGLContextGroup::removeContext(WebGLRenderingContext* context)
     63 {
     64     // We must call detachAndRemoveAllObjects before removing the last context.
     65     if (m_contexts.size() == 1 && m_contexts.contains(context))
     66         detachAndRemoveAllObjects();
     67 
     68     m_contexts.remove(context);
     69 }
     70 
     71 void WebGLContextGroup::removeObject(WebGLSharedObject* object)
     72 {
     73     m_groupObjects.remove(object);
     74 }
     75 
     76 void WebGLContextGroup::addObject(WebGLSharedObject* object)
     77 {
     78     m_groupObjects.add(object);
     79 }
     80 
     81 void WebGLContextGroup::detachAndRemoveAllObjects()
     82 {
     83     while (!m_groupObjects.isEmpty()) {
     84         HashSet<WebGLSharedObject*>::iterator it = m_groupObjects.begin();
     85         (*it)->detachContextGroup();
     86     }
     87 }
     88 
     89 void WebGLContextGroup::loseContextGroup(WebGLRenderingContext::LostContextMode mode)
     90 {
     91     // Detach must happen before loseContextImpl, which destroys the GraphicsContext3D
     92     // and prevents groupObjects from being properly deleted.
     93     detachAndRemoveAllObjects();
     94 
     95     for (HashSet<WebGLRenderingContext*>::iterator it = m_contexts.begin(); it != m_contexts.end(); ++it)
     96         (*it)->loseContextImpl(mode);
     97 }
     98 
     99 } // namespace WebCore
    100