GLES2Context.cpp   [plain text]

/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 * Copyright (C) 2010, 2011, 2012 Research In Motion Limited. All rights reserved.
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 * in the documentation and/or other materials provided with the
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#include "config.h"
#include "GLES2Context.h"

#include "Assertions.h"
#include "BackingStoreCompositingSurface.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "SurfacePool.h"
#include "WebPageClient.h"
#include "WebPage_p.h"

#include <GLES2/gl2.h>

using BlackBerry::Platform::Graphics::Window;

namespace BlackBerry {
namespace WebKit {

BackingStoreCompositingSurface* GLES2Context::compositingSurface() const
{
    return SurfacePool::globalSurfacePool()->compositingSurface();
}

Platform::Graphics::Buffer* GLES2Context::buffer() const
{
    if (m_window)
        return m_window->buffer();

#if ENABLE_COMPOSITING_SURFACE
    if (BackingStoreCompositingSurface* surface = compositingSurface())
        return surface->backBuffer()->nativeBuffer();
#endif

    ASSERT_NOT_REACHED();
    return 0;
}

PassOwnPtr<GLES2Context> GLES2Context::create(WebPagePrivate* page)
{
    return adoptPtr(new GLES2Context(page));
}

GLES2Context::GLES2Context(WebPagePrivate* page)
    : m_window(0)
{
    if (Window* window = page->m_client->window()) {
        if (window->windowUsage() == Window::GLES2Usage)
            m_window = window;
    }
}

GLES2Context::~GLES2Context()
{
}

Platform::IntSize GLES2Context::surfaceSize() const
{
    if (m_window)
        return m_window->surfaceSize();

#if ENABLE_COMPOSITING_SURFACE
    if (BackingStoreCompositingSurface* surface = compositingSurface())
        return surface->backBuffer()->surfaceSize();
#endif

    ASSERT_NOT_REACHED();
    return Platform::IntSize();
}

bool GLES2Context::makeCurrent()
{
    Platform::Graphics::makeBufferCurrent(buffer(), Platform::Graphics::GLES2);
    return true;
}

bool GLES2Context::swapBuffers()
{
    ASSERT(glGetError() == GL_NO_ERROR);

    // If there's a window the backing store will swap it when the time is right.
    // Return early because there might be an unused but non-null compositing surface
    if (m_window)
        return true;

#if ENABLE_COMPOSITING_SURFACE
    if (BackingStoreCompositingSurface* surface = compositingSurface()) {
        // Because we are rendering compositing contents into an off-screen pixmap and
        // we need to blend the pixmap with the web page window surface we have to call
        // glFinish() here.
        glFinish();
        surface->swapBuffers();
    }
#endif

    return true;
}

} // namespace WebKit
} // namespace BlackBerry