On Thursday 13 March 2014 07:32:36 Jason H wrote: > Thanks everyone. > > Sean, can you elaborate on "Qt has good support for OpenGL so using this > approach should be pretty simple for you." Is this just referring to GL > Widgets?
For basic OpenGL usage you have the choice of QGLWidget or QWindow (or QOffscreenSurface) + QOpenGLContext. For using compute shaders (and all other shader types) see QOpenGLShaderProgram. For textures take a look at QOpenGLTexture. For framebuffer objects either QOpenGLFramebufferObject or call raw GL (depends upon how much control you need over the FBO). Cheers, Sean > > Thanks again. > > > ________________________________ > From: Sean Harmer <sean.har...@kdab.com> > To: interest@qt-project.org; Jason H <scorp...@yahoo.com> > Sent: Thursday, March 13, 2014 5:40 AM > Subject: Re: [Interest] Qt and OpenCL crash course > > On Wednesday 12 March 2014 12:08:53 Jason H wrote: > > I need to do some elementary graphics operations on QPixmap or QImage. I > > can do these in Qt to some extent already. But for this latest project I > > will be processing 4k resolution images. My operations are: > > Translate off origin > > Rotate by an acute angle (around a point sometimes not in the image) > > Pixel value normailzation > > > > To what extent does Qt support these operations in a hardware accelerated > > manner? Or how hard is it for me to use the hardware to produce those > > functions to inter-operate with Qt? > > > > Many thanks! > > Have you considered using OpenGL? Two options: > > 1) If you have OpenGL 4.3 capable hw use a compute shader plus a texture or > shader storage buffer > > 2) If you don't have OpenGL 4.3 capable hw use a framebuffer object and a > texture. > > Qt has good support for OpenGL so using this approach should be pretty > simple for you. > > Cheers, > > Sean > -- > Dr Sean Harmer | sean.har...@kdab.com | Managing Director UK > Klarälvdalens Datakonsult AB, a KDAB Group company > Tel. Sweden (HQ) +46-563-540090, USA +1-866-777-KDAB(5322) > KDAB - Qt Experts - Platform-independent software solutions > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest -- Dr Sean Harmer | sean.har...@kdab.com | Managing Director UK Klarälvdalens Datakonsult AB, a KDAB Group company Tel. Sweden (HQ) +46-563-540090, USA +1-866-777-KDAB(5322) KDAB - Qt Experts - Platform-independent software solutions _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
