qt - QOpenGLFramebufferObjectFormat::toImage() Android black image -


i'm trying code https://dangelog.wordpress.com/2013/02/10/using-fbos-instead-of-pbuffers-in-qt-5-2/ on android device.

after changes code running without errors, can't correct image yet. on android image black. doing wrong? thanks!

here changes in first lines:

qsurfaceformat format; format.setmajorversion(2); format.setminorversion(2);  qoffscreensurface window; //window.setsurfacetype(qwindow::openglsurface); window.setformat(format); window.create();  qopenglcontext* context=(qopenglcontext::currentcontext());  // context.setformat(format); /* if (!context.create())     qfatal("cannot create requested opengl context!"); */ context->makecurrent(&window);  const qrect drawrect(0, 0, 400, 400); const qsize drawrectsize = drawrect.size();  qopenglframebufferobjectformat fboformat; //fboformat.setsamples(16); //fboformat.setattachment(qopenglframebufferobject::combineddepthstencil);  qopenglframebufferobject fbo(drawrectsize, fboformat); fbo.bind();

update 1 changed code into

qsurfaceformat format; format.setmajorversion(3); format.setminorversion(0);  char* extensionlist = (char*) glgetstring(gl_version); qdebug()<<extensionlist; qoffscreensurface window; //qoffscreen openglsurface  //window.setsurfacetype(qwindow::openglsurface);  window.setformat(format); window.create();  //qopenglcontext* context=(qopenglcontext::currentcontext());  qopenglcontext context; context.setformat(format); if (!context.create())     qfatal("cannot create requested opengl context!");  if(!context.makecurrent(&window))     qfatal("cannot makecurrent(windows)!");

but doesn't change result...i still black png image. check format of qimage , seems correct (arg32, corresponds format of fbo gl_rgba).


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