fbitem.cpp Example File

quickwidgets/quickwidget/fbitem.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 "fbitem.h" #include <QtGui/QOpenGLFramebufferObject> #include <QtGui/QOpenGLContext> #include <QtGui/QOpenGLFunctions> #include <QtCore/QDebug> #if QT_CONFIG(opengl) class FbRenderer : public QQuickFramebufferObject::Renderer { public: FbRenderer() { } // 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() override { qDebug("FbRenderer destroyed"); } void render() override { 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) override { qDebug() << "Creating FBO" << size; QOpenGLFramebufferObjectFormat format; format.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil); return new QOpenGLFramebufferObject(size, format); } private: float c = 0; int dir = 1; }; #endif QQuickFramebufferObject::Renderer *FbItem::createRenderer() const { #if QT_CONFIG(opengl) return new FbRenderer; #else return nullptr; #endif }