ManagedTexture.cpp   [plain text]

/*
 * Copyright (C) 2010, Google 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
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"

#if USE(ACCELERATED_COMPOSITING)

#include "ManagedTexture.h"

#include "GraphicsContext3D.h"
#include "TextureManager.h"

namespace WebCore {

ManagedTexture::ManagedTexture(TextureManager* manager)
    : m_textureManager(manager)
    , m_token(0)
    , m_format(0)
    , m_textureId(0)
{
    m_textureManager->registerTexture(this);
}

ManagedTexture::ManagedTexture(TextureManager* manager, TextureToken token, IntSize size, unsigned format, unsigned textureId)
    : m_textureManager(manager)
    , m_token(token)
    , m_size(size)
    , m_format(format)
    , m_textureId(textureId)
{
    m_textureManager->registerTexture(this);
}

ManagedTexture::~ManagedTexture()
{
    if (!m_textureManager)
        return;
    m_textureManager->unregisterTexture(this);
    if (m_token)
        m_textureManager->releaseToken(m_token);
}

void ManagedTexture::setTextureManager(TextureManager* manager)
{
    if (manager == m_textureManager)
        return;

    if (m_textureManager)
        m_textureManager->unregisterTexture(this);
    m_textureManager = manager;
    clear();
    if (m_textureManager)
        m_textureManager->registerTexture(this);
}

bool ManagedTexture::isValid(const IntSize& size, unsigned format)
{
    return m_token && size == m_size && format == m_format && m_textureManager && m_textureManager->hasTexture(m_token);
}

bool ManagedTexture::reserve(const IntSize& size, unsigned format)
{
    if (!m_textureManager)
        return false;

    if (!m_token)
        m_token = m_textureManager->getToken();

    bool reserved = true;
    if (size == m_size && format == m_format && m_textureManager->hasTexture(m_token))
        m_textureManager->protectTexture(m_token);
    else {
        m_textureId = 0;
        reserved = m_textureManager->requestTexture(m_token, size, format);
        if (reserved) {
            m_size = size;
            m_format = format;
        }
    }

    return reserved;
}

void ManagedTexture::unreserve()
{
    if (!m_token || !m_textureManager)
        return;

    m_textureManager->unprotectTexture(m_token);
}

void ManagedTexture::allocate(TextureAllocator* allocator)
{
    ASSERT(m_textureManager->hasTexture(m_token));
    if (!m_textureId)
        m_textureId = m_textureManager->allocateTexture(allocator, m_token);
}

void ManagedTexture::bindTexture(GraphicsContext3D* context, TextureAllocator* allocator)
{
    allocate(allocator);
    context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_textureId);
}

void ManagedTexture::framebufferTexture2D(GraphicsContext3D* context, TextureAllocator* allocator)
{
    allocate(allocator);
    context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0, GraphicsContext3D::TEXTURE_2D, m_textureId, 0);
}

PassOwnPtr<ManagedTexture> ManagedTexture::steal()
{
    OwnPtr<ManagedTexture> texture = adoptPtr(new ManagedTexture(m_textureManager, m_token, m_size, m_format, m_textureId));
    clear();
    return texture.release();
}

void ManagedTexture::clear()
{
    m_token = 0;
    m_size = IntSize();
    m_format = 0;
    m_textureId = 0;
}

}

#endif // USE(ACCELERATED_COMPOSITING)