On Sonntag, 24. März 2019 10:07:06 CET Denis Shienkov wrote: > Allan, > > so, do we need in OpenGL support for 2-d acceleration in QtWidget > applications running via X11? When, e.g. we use QPainter? > > I'm already confused... What we need to have to be use the GPU > acceleration on X11 with QtWidgets? > There are currently three ways.
1) Use the old scene-graph and set a QOpenGLWidget as the view of a QGraphicsView. 2) Create a QOpenGLFrameBufferObject and a QOpenGLPaintDevice, and paint inside that for offscreen accelerated OpenGL painting inside a QPainter. 3) Use a QOpenGLWindow as the root window In the widgets/painting examples you can find a pattern that uses the QOpenGLFrameBufferObject and blitting to have an otherwise rasterized application switch to opengl acceleration. Though the pattern is still a bit too Qt4'ish even after I tried cleaning it up last year. Note though that the recommended way of doing hardware accelerated painting these days with Qt, is using QML or the QtQuick scenegraph from C++. QPainter being so sequential and imperative will never be able to take full advantage of OpenGL because the API wasn't designed for it. 'Allan _______________________________________________ Development mailing list Development@qt-project.org https://lists.qt-project.org/listinfo/development
