101 lines
3.8 KiB
C++
101 lines
3.8 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2017 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "fbitem.h"
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#include <QOpenGLFramebufferObject>
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#include <QOpenGLContext>
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#include <QOpenGLFunctions>
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#include <QtCore/QDebug>
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#if QT_CONFIG(opengl)
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class FbRenderer : public QQuickFramebufferObject::Renderer
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{
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public:
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FbRenderer() { }
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// The lifetime of the FBO and this class depends on how QQuickWidget
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// manages the scenegraph and context when it comes to showing and hiding
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// the widget. The actual behavior is proven by the debug prints.
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~FbRenderer() override {
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qDebug("FbRenderer destroyed");
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}
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void render() override {
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QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
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f->glClearColor(c, 0, 0, 1);
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f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
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c += 0.01f * dir;
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if (c >= 1.0f || c <= 0.0f)
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dir *= -1;
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update();
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}
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QOpenGLFramebufferObject *createFramebufferObject(const QSize &size) override {
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qDebug() << "Creating FBO" << size;
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QOpenGLFramebufferObjectFormat format;
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format.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);
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return new QOpenGLFramebufferObject(size, format);
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}
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private:
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float c = 0;
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int dir = 1;
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};
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#endif
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QQuickFramebufferObject::Renderer *FbItem::createRenderer() const
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{
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#if QT_CONFIG(opengl)
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return new FbRenderer;
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#else
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return nullptr;
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#endif
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}
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