On 25/04/18 12:43, Merlijn Wajer wrote: > Hi! > > On 16/04/18 16:49, Tomi Valkeinen wrote: >> Hi All, >> >> I have implemented a WSEGL plugin library for Imagination's PVR driver >> for SGX, which allows using SGX via DRI3. In other words, it is one >> piece in the puzzle of using SGX with X11. >> >> The project is not production quality, as I have not had time to perfect >> it (and, to be honest, I'm not exactly an expert on X), but now that I >> finally got all the permissions to publish it, I'm doing just that to >> allow other people to use it and help making it fully usable. >> >> You can find the code and a more detailed description here: >> >> https://github.com/TexasInstruments/dri3wsegl >> >> Hopefully with this code now public, we can get an SGX and GC320 >> accelerated X11 on TI devices. > > Great, this will be fun to try. > > From the README: > >> Xorg's modesetting driver supports DRI3, but unfortunately only when using Glamor, which uses OpenGL for 2D acceleration. There's no OpenGL HW on TI's devices. >> >> However, for testing purposes, it is possible to use Mesa SW rendering to fulfill the OpenGL requirement. With this this setup, SGX is used to render to a buffer, passed to the modesetting driver via DRI3, which is then composited to the screen using OpenGL SW rendering. Needless to say, the composition is very slow. >> >> Although slow with SW rendering, modesetting driver is quite stable and the DRI3 support works fine, so it is good for testing. > > There is this: > > https://cgit.freedesktop.org/xorg/xserver/commit/?id=c36f56808ffbefc4a3dcf61dfad17f62aeb8e16c > https://cgit.freedesktop.org/xorg/xserver/log/glamor?id=c36f56808ffbefc4a3dcf61dfad17f62aeb8e16c > https://www.phoronix.com/scan.php?page=news_item&px=GLAMOR-GLES2-Fallback > https://cgit.freedesktop.org/xorg/xserver/tree/glamor/glamor_egl.c#n952 > > So actually, Glamor should already work, given a new enough X server? Oh, thanks for pointing this out. Indeed, Glamor might just work. I need to try to find time to test this. That said, I think there's still value in a separate X driver that uses GC320 for 2D and SGX for 3D. I have no numbers, but I would expect that combination to give much more performance than Glamor. But for devices without GC320, Glamor sounds like the way to go. Well, there's also a third alternative, which is to use PVR's 2D API for 2D, instead of going through OGLES. > This will be exciting to try out on the N900 and perhaps on the Droid 4 > as well. I will try to test this in a few weeks from now. I would > personally be very happy if we can use just the modesetting driver. Yep. I have no idea if this will work on OMAP3, so I'm interested to hear about your experiences. I think the SGX driver I've been using does not have OMAP3 support. Nikolaus has done some effort to bring the drivers together, though. Tomi -- Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
