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