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Diffstat (limited to 'examples/quick/quickwidgets/quickwidget/fbitem.cpp')
-rw-r--r-- | examples/quick/quickwidgets/quickwidget/fbitem.cpp | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/examples/quick/quickwidgets/quickwidget/fbitem.cpp b/examples/quick/quickwidgets/quickwidget/fbitem.cpp new file mode 100644 index 0000000000..fc2a4ea7ad --- /dev/null +++ b/examples/quick/quickwidgets/quickwidget/fbitem.cpp @@ -0,0 +1,90 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: http://www.qt.io/licensing/ +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 "fbitem.h" +#include <QtGui/QOpenGLFramebufferObject> +#include <QtGui/QOpenGLContext> +#include <QtGui/QOpenGLFunctions> +#include <QtCore/QDebug> + +#ifndef QT_NO_OPENGL +class FbRenderer : public QQuickFramebufferObject::Renderer +{ +public: + FbRenderer() : c(0), dir(1) { } + + // The lifetime of the FBO and this class depends on how QQuickWidget + // manages the scenegraph and context when it comes to showing and hiding + // the widget. The actual behavior is proven by the debug prints. + ~FbRenderer() { + qDebug("FbRenderer destroyed"); + } + + void render() { + QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions(); + f->glClearColor(c, 0, 0, 1); + f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); + c += 0.01f * dir; + if (c >= 1.0f || c <= 0.0f) + dir *= -1; + update(); + } + + QOpenGLFramebufferObject *createFramebufferObject(const QSize &size) { + qDebug() << "Creating FBO" << size; + QOpenGLFramebufferObjectFormat format; + format.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil); + return new QOpenGLFramebufferObject(size, format); + } + +private: + float c; + int dir; +}; +#endif + +QQuickFramebufferObject::Renderer *FbItem::createRenderer() const +{ +#ifndef QT_NO_OPENGL + return new FbRenderer; +#else + return nullptr; +#endif +} |