On 1/30/14 5:36 AM, Dr. Roman Grothausmann wrote: > On 29/01/14 10:30, DRC wrote: >> The bug is easily reproducible. I am suspicious that it might have >> something to do with the application's use of FBO's, but I'm not >> entirely sure what the problem could be, as other apps that render to >> FBO's are known to work with VGL. The application is clearly calling >> glXSwapBuffers() (via glutSwapBuffers()) to swap the back buffer to the >> front buffer, so that means it has somehow transferred the image from >> the FBO into the back buffer already, and thus VirtualGL should be >> picking up the pixels. Obviously it isn't, but after 5 hours of poring >> over it, I have no clue. I would suggest maybe contacting the voreen >> developers to see if they can at least shed some light on how their >> application is drawing pixels to the canvas. That could give me a clue >> as to why it isn't working properly in VGL. > > Many thanks for looking into this. I informed the voreen developers that info > is > needed. Could it be the use of GLSL?
Possibly. The thing that confuses me is that I see the app calling glXSwapBuffers(), which means that it must have something to swap, which means that pixels must be in the back buffer. But when VirtualGL tries to read those pixels, it gets nothing. I'm also unclear as to how the app is delivering the rendered pixels from the FBOs it creates into the back buffer, and looking at both the OpenGL trace (using apitrace) and the VirtualGL trace didn't reveal anything obvious. I'm sure it is doing something that VirtualGL somehow isn't catching. I just don't know what. ------------------------------------------------------------------------------ WatchGuard Dimension instantly turns raw network data into actionable security intelligence. It gives you real-time visual feedback on key security issues and trends. Skip the complicated setup - simply import a virtual appliance and go from zero to informed in seconds. http://pubads.g.doubleclick.net/gampad/clk?id=123612991&iu=/4140/ostg.clktrk _______________________________________________ VirtualGL-Users mailing list VirtualGL-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/virtualgl-users
