qt-everywhere-src-5.15.1/qtdeclarative/examples/quick/scenegraph/rendernode/customrenderitem.cpp

/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * 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.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
** OWNER 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "customrenderitem.h"
#include <QQuickWindow>
#include <QSGRendererInterface>

#include "openglrenderer.h"
#ifdef Q_OS_MACOS
#include "metalrenderer.h"
#endif
#if QT_CONFIG(d3d12)
#include "d3d12renderer.h"
#endif
#include "softwarerenderer.h"

//! [1]
CustomRenderItem::CustomRenderItem(QQuickItem *parent)
    : QQuickItem(parent)
{
    // Our item shows something so set the flag.
    setFlag(ItemHasContents);
}
//! [1]

//! [2]
QSGNode *CustomRenderItem::updatePaintNode(QSGNode *node, UpdatePaintNodeData *)
{
    QSGRenderNode *n = static_cast<QSGRenderNode *>(node);

    QSGRendererInterface *ri = window()->rendererInterface();
    if (!ri)
        return nullptr;

    switch (ri->graphicsApi()) {
    case QSGRendererInterface::OpenGL:
        Q_FALLTHROUGH();
    case QSGRendererInterface::OpenGLRhi:
#if QT_CONFIG(opengl)
        if (!n)
            n = new OpenGLRenderNode;
        static_cast<OpenGLRenderNode *>(n)->sync(this);
#endif
        break;

    case QSGRendererInterface::MetalRhi:
// Restore when QTBUG-78580 is done and the .pro is updated accordingly
//#ifdef Q_OS_DARWIN
#ifdef Q_OS_MACOS
        if (!n) {
            MetalRenderNode *metalNode = new MetalRenderNode;
            n = metalNode;
            metalNode->resourceBuilder()->setWindow(window());
            QObject::connect(window(), &QQuickWindow::beforeRendering,
                             metalNode->resourceBuilder(), &MetalRenderNodeResourceBuilder::build);
        }
        static_cast<MetalRenderNode *>(n)->sync(this);
#endif
        break;

    case QSGRendererInterface::Direct3D12: // ### Qt 6: remove
#if QT_CONFIG(d3d12)
        if (!n)
            n = new D3D12RenderNode;
        static_cast<D3D12RenderNode *>(n)->sync(this);
#endif
        break;

    case QSGRendererInterface::Software:
        if (!n)
            n = new SoftwareRenderNode;
        static_cast<SoftwareRenderNode *>(n)->sync(this);
        break;

    default:
        break;
    }

    if (!n)
        qWarning("QSGRendererInterface reports unknown graphics API %d", ri->graphicsApi());

    return n;
}
//! [2]

// This item does not support being moved between windows. If that is desired,
// itemChange() should be reimplemented as well.