On Sun, Apr 04, 2010 at 01:09:51AM +0200, Marek Olšák wrote: > > Since Nicolai has already implemented the branch emulation and some other > optimizations, it would be nice to take over his work. I tried to use the > branch emulation on vertex shaders and it did not work correctly, I guess it > needs little fixing. See this branch in his repo: > http://cgit.freedesktop.org/~nh/mesa/log/?h=r300g-glsl<http://cgit.freedesktop.org/%7Enh/mesa/log/?h=r300g-glsl> > Especially this commit implements exactly what you propose (see comments in > the code): > http://cgit.freedesktop.org/~nh/mesa/commit/?h=r300g-glsl&id=71c8d4c745da23b0d4f3974353b19fad89818d7f<http://cgit.freedesktop.org/%7Enh/mesa/commit/?h=r300g-glsl&id=71c8d4c745da23b0d4f3974353b19fad89818d7f> > > Reusing this code for Gallium seems more reasonable to me than reinventing > the wheel and doing basically the same thing elsewhere. I recommend > implementing a TGSI backend in the r300 compiler, which will make possible > using it with TGSI shaders. So basically a TGSI shader would be converted to > the RC representation the way it's done in r300g right now, and code for > converting RC -> hw code would get replaced by conversion RC -> TGSI. Both > RC and TGSI are very similar so it'll be pretty straightforward. With a TGSI > backend, another step would be to make a nice hw-independent and > configurable interface on top of it which should go to util. So far it's > simple, now comes some real work: fixing the branch emulation and continuing > from (2) in your list.
I am not sure if I follow you here, so let me know if I am understanding this correctly. What you are suggesting is to take Nicolai's branch, which right now does TGSI -> RC -> Branch Emulation in RC -> hw code and instead of converting from RC to hw code convert from RC back into TGSI. Then, pull the TGSI -> RC -> Branch Emulation in RC -> TGSI path out of the r300 compiler and place it in gallium/auxillary/util so it can be used by other Gallium drivers that want to emulate branches. Is this correct? -Tom ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Mesa3d-dev mailing list Mesa3d-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
