I find myself porting a Qt application that uses QOffscreenSurface and QOpenGLContext to draw opengl 4.1 graphics onto a separate thread that has no window. 
The QOpenGLContext class seems like it provides the gl context, with the following code at the constructor:

Constructor::
{
            glContext = new QOpenGLContext;
            QSurfaceFormat surfaceFormat;
            surfaceFormat.setMajorVersion(4);
            surfaceFormat.setMinorVersion(1);
            surfaceFormat.setProfile(QSurfaceFormat::CoreProfile);
            glContext->setFormat(surfaceFormat);
            glContext->create();

            offscreenSurface = new QOffscreenSurface;
            offscreenSurface->setFormat(glContext->format());
            offscreenSurface->create();
}

The thread when running (no draw() function, just a normal function) calls:

void class::run()
{
            glContext->makeCurrent( offscreenSurface.get() );
	   // other GL drawing code
}

The QOffscreenSurface I gather is the equivalent to Fl_Image_Surface in FLTK, but I don’t have a clue what would be equivalent to QOpenGLContext.  Does FLTK offer a GL context class?



—
Gonzalo Garramuno
ggarra13@gmail.com




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