/*
 * Copyright (C) 2018 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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"

#if ENABLE(WEBGL)
#include "GraphicsContextGLOpenGLManager.h"

#include "GraphicsContextGLOpenGL.h"
#include "Logging.h"

namespace WebCore {

GraphicsContextGLOpenGLManager& GraphicsContextGLOpenGLManager::sharedManager()
{
    static NeverDestroyed<GraphicsContextGLOpenGLManager> s_manager;
    return s_manager;
}

#if PLATFORM(MAC)
void GraphicsContextGLOpenGLManager::displayWasReconfigured(CGDirectDisplayID, CGDisplayChangeSummaryFlags flags, void*)
{
    LOG(WebGL, "GraphicsContextGLOpenGLManager::displayWasReconfigured");
    if (flags & kCGDisplaySetModeFlag)
        GraphicsContextGLOpenGLManager::sharedManager().displayWasReconfigured();
}
#endif

#if PLATFORM(COCOA)
void GraphicsContextGLOpenGLManager::displayWasReconfigured()
{
    for (const auto& context : m_contexts)
        context->displayWasReconfigured();
}
#endif

void GraphicsContextGLOpenGLManager::addContext(GraphicsContextGLOpenGL* context)
{
    ASSERT(context);
    if (!context)
        return;

#if PLATFORM(MAC) && !ENABLE(WEBPROCESS_WINDOWSERVER_BLOCKING)
    if (!m_contexts.size())
        CGDisplayRegisterReconfigurationCallback(displayWasReconfigured, nullptr);
#endif

    ASSERT(!m_contexts.contains(context));
    m_contexts.append(context);
}

void GraphicsContextGLOpenGLManager::removeContext(GraphicsContextGLOpenGL* context)
{
    if (!m_contexts.contains(context))
        return;
    m_contexts.removeFirst(context);
#if PLATFORM(MAC) && !ENABLE(WEBPROCESS_WINDOWSERVER_BLOCKING)
    if (!m_contexts.size())
        CGDisplayRemoveReconfigurationCallback(displayWasReconfigured, nullptr);
#endif
}

void GraphicsContextGLOpenGLManager::recycleContextIfNecessary()
{
    if (hasTooManyContexts()) {
        LOG(WebGL, "GraphicsContextGLOpenGLManager recycled context (%p).", m_contexts[0]);
        m_contexts[0]->recycleContext();
    }
}

} // namespace WebCore

#endif // ENABLE(WEBGL)
