Could you please show us an example in TGSI where a 3rd address register is needed?
Thanks, Marek On Tue, Aug 5, 2014 at 6:54 AM, Ilia Mirkin <imir...@alum.mit.edu> wrote: > Hello, > > I'm in the process of working out the details of adding dynamic > sampler support to mesa/st as part of ARB_gpu_shader5. Unfortunately > I've run into a bit of a roadblock. > > One approach I've tried is to load the indirect sampler index into an > address register and then use that as the offset. However in order to > realistically support that I need a 3rd address register, while right > now tgsi_ureg limits it to 2 address registers. Would it be OK to > relax the restriction to 3? (The reason I need a third is that if e.g. > the dst has a reladdr, I'd have to change a bunch of stuff to make > that function properly without a 3rd addr reg, since I can't just MOV > the sampler to a temp like it does for all the other src's.) > > Another apporach I've tried is to just use a TEMP register as the > indirect offset here. Unfortunately this gets destroyed by > st_glsl_to_tgsi's various optimizations which assume that temp > registers can't be reladdr's and so messes up the values. I started > adding support for that, but then quickly realized that was probably > not the right thing to do. > > So... should I increase the number of address registers to 1? Or is > there some other simple approach that I'm missing? > > Thanks, > > -ilia > _______________________________________________ > mesa-dev mailing list > mesa-dev@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/mesa-dev _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev