I am still unclear why the normal mechanism of setting VGL_FPS and disabling frame spoiling wouldn't work for you. Have you tried that? It's not that I'm opposed to this feature, but I also don't want to implement something that isn't actually necessary. Please make a case for why VGL_3DFPS solves a problem that couldn't be solved by using VGL_FPS with frame spoiling disabled.
On Jun 2, 2013, at 3:58 PM, Dyweni - VirtualGL-Users <t7nhgfds7...@dyweni.com> wrote: > Hi DRC/All, > > I have mucked around with the VirtualGL 2.3.2 code and have come up with a > solution that seems to work well. I have to mention that the solution is > rather rough around the edges. Some of the code / ideas were drawn from > Mesa's GLXGEARS program (i.e. calculating and reporting the current FPS and > the location to do so in). > > Here is how this works: > 1. User provides -fps3d <n> argument to vglrun. N is any double 0 or greater. > 2. The function 'glXSwapBuffers' (server/faker-glx.cpp) continually monitors > the current fps and adjusts 'delay' to keep the fps around the requested fps > value (the fps3d argument). > 3. User can tweak the fps3d value via the vglconfig (CTRL+SHIFT+F9) GUI > utility. > > I am sure that the algorithm for adjusting the delay can be improved. It was > what I could come up with in the limited time I had today. > > I have attached a patch that applies to VirtualGL 2.3.2. Please feel free to > review / test and provide feedback. > > --- > Thanks, > Dyweni > > > On 2012-07-26 13:41, DRC wrote: >> Since VirtualGL redirects the 3D rendering into offscreen buffers, there >> is no concept of VSync, because there is no monitor involved until the >> pixels are drawn on the client machine, and by that time, the 3D >> rendering is already done. >> In the current implementation, there is no way to limit the 3D rendering >> rate except to disable frame spoiling. Disabling frame spoiling couples >> the 3D rendering and compress/send stages of the pipeline, so the frame >> rate will be the lesser of (a) the VGL_FPS setting or (b) the rate at >> which the client can process frames. However, that's probably not what >> you want, because you may experience "mouse lag" when frame spoiling is >> disabled. >> This issue has never come up, because in visualization apps, the frame >> rate is ultimately limited by the sampling rate of the mouse, which is >> generally 40-60 Hz. I'm honestly not sure what would be the best >> approach to applying a frame rate governor on the 3D side (a VGL_3DFPS >> option, if you will.) It might be as simple as putting a delay into the >> buffer swap function. >> What I'm wondering, however, is whether our long-term plans to replace >> Pbuffers with FBO's and hidden windows might magically fix this, since >> VSync might still work when rendering to a hidden window. >> If anyone else has further insight, please share. >> On 7/26/12 12:56 PM, Dyweni - VirtualGL-Users wrote: >>> Hi All, >>> I'm wondering if VirgualGL has support for VSync? I know that VirtualGL >>> has support to output only x frames per second, but that is different >>> from VSync. >>> I have a game (EVE Online) that can limit itself to the VSync. In >>> normal X, it limits itself to 60 FPS (my monitor refresh rate) thanks to >>> VSync, and that keeps the CPU usage low. However, when running on >>> VirtualGL, it does not limit its FPS and they skyrocket to 120+ FPS >>> which drives the CPU usage high. >>> I would like to be able to lock the game to the VSync (say 60 FPS, to >>> keep the CPU usage low) and then export x frames per second (as I do >>> know with the -fps) switch. >>> Is this possible? >>> -- >>> Thanks, >>> Dyweni >>> ------------------------------------------------------------------------------ >>> Live Security Virtual Conference >>> Exclusive live event will cover all the ways today's security and >>> threat landscape has changed and how IT managers can respond. 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