/*
 * Copyright (C) 2011 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"

#include "core/html/canvas/WebGLContextGroup.h"

#include "core/html/canvas/WebGLSharedObject.h"

namespace blink {

PassRefPtr<WebGLContextGroup> WebGLContextGroup::create()
{
    RefPtr<WebGLContextGroup> contextGroup = adoptRef(new WebGLContextGroup());
    return contextGroup.release();
}

WebGLContextGroup::WebGLContextGroup()
{
}

WebGLContextGroup::~WebGLContextGroup()
{
    detachAndRemoveAllObjects();
}

blink::WebGraphicsContext3D* WebGLContextGroup::getAWebGraphicsContext3D()
{
    ASSERT(!m_contexts.isEmpty());
    HashSet<WebGLRenderingContextBase*>::iterator it = m_contexts.begin();
    return (*it)->webContext();
}

void WebGLContextGroup::addContext(WebGLRenderingContextBase* context)
{
    m_contexts.add(context);
}

void WebGLContextGroup::removeContext(WebGLRenderingContextBase* context)
{
    // We must call detachAndRemoveAllObjects before removing the last context.
    if (m_contexts.size() == 1 && m_contexts.contains(context))
        detachAndRemoveAllObjects();

    m_contexts.remove(context);
}

void WebGLContextGroup::removeObject(WebGLSharedObject* object)
{
    m_groupObjects.remove(object);
}

void WebGLContextGroup::addObject(WebGLSharedObject* object)
{
    m_groupObjects.add(object);
}

void WebGLContextGroup::detachAndRemoveAllObjects()
{
    while (!m_groupObjects.isEmpty()) {
        HashSet<WebGLSharedObject*>::iterator it = m_groupObjects.begin();
        (*it)->detachContextGroup();
    }
}

void WebGLContextGroup::loseContextGroup(WebGLRenderingContextBase::LostContextMode mode)
{
    // Detach must happen before loseContextImpl, which destroys the GraphicsContext3D
    // and prevents groupObjects from being properly deleted.
    detachAndRemoveAllObjects();

    for (HashSet<WebGLRenderingContextBase*>::iterator it = m_contexts.begin(); it != m_contexts.end(); ++it)
        (*it)->loseContextImpl(mode);
}

} // namespace blink
