qt-everywhere-src-5.14.1/qtquick3d/tests/manual/render/clearcolor/renderclearcolorexample.cpp

/****************************************************************************
**
** Copyright (C) 2019 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 "../shared/renderexample.h"
#include <QtGui/QVector4D>
#include <QtQuick3DRender/private/qssgrendercontext_p.h>
#include <QtGui/QGuiApplication>

namespace {
class ClearColor : public QSSGRenderExample
{
    QSSGRef<QSSGRenderContext> m_context;
    qint64 m_elapsedTime = 0;

public:
    ClearColor()
    {
    }

    void initialize() override
    {
        m_context = QSSGRenderContext::createGl(format());
    }

    virtual void drawFrame(qint64 delta) override
    {
        m_elapsedTime += delta;
        // Apply this value immediately but track it so that a later pop will in fact
        // restore this value.
        if (m_elapsedTime < 1000) {
            m_context->setClearColor(QVector4D(.8f, .0f, .0f, 1.f));
        } else if (m_elapsedTime < 2000) {
            m_context->setClearColor(QVector4D(0.f, .0f, 1.f, 1.f));
        } else {
            m_context->setClearColor(QVector4D(0.f, 1.0f, 1.f, 1.f));
            m_elapsedTime = 0;
        }
        m_context->clear(QSSGRenderClearFlags(QSSGRenderClearValues::Color));
    }
};
}


int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    QSurfaceFormat fmt;
    fmt.setProfile(QSurfaceFormat::CoreProfile);

    // Advanced: Try 4.3 core (so we get compute shaders for instance)
    fmt.setVersion(4, 3);

    ClearColor clearColor;
    clearColor.setFormat(fmt);
    clearColor.show();

    return app.exec();
}