On Wed, Jan 7, 2015 at 8:19 PM, Dave Airlie <airl...@gmail.com> wrote: > Okay I've been doing some further FMASK studies empirically, dumping > the fmask after rendering to an MSAA surface, > > it appears on r600 at 8xMSAA, every 8x8 tile requires 128 bytes of > storage, that is used depending on the value in the CMASK. > > So it appears at 8xMSAA for every 4-bit entry in the CMASK we need to > allocate 128-bytes in the FMASK, now the FMASK appears to tile the > CMASK entries as well inside a macrotile layout. > > At this point I think the tiling docs I have are just wrong for r600, > as they state at 8xMSAA with 8x8 tile, it should be w*h*(samples / 8) > *log2(samples) which for me is 8x8x1x3, which is 196 bytes, which > clearly the hw isn't doing. > > Anyone from AMD have more accurate info or should I just hack this, I > get the feeling overallocating the FMASK is better than what we do now > anyways.
I can dig around a bit, but most of the r600 stuff is not really fresh in anyone's mind. I'm fine with just overallocating it at this point. Alex _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
