On Tue, Mar 31, 2015 at 11:11 AM, Rob Clark <robdcl...@gmail.com> wrote: > On Tue, Mar 31, 2015 at 2:03 PM, Kenneth Graunke <kenn...@whitecape.org> > wrote: >> I'm pretty sure you want b2f here, not u2f...the slt/sge/seq/sne opcodes >> are defined to return either 0.0 or 1.0. flt and friends return 0 or >> 0xFFFFFFFF. u2f converts the numerical value of the unsigned source to >> float, so this would return 0.0 or 4294967295.0. >> > > hmm, that is a bit sad (since on the flt/etc cases I'd have to > multiply by 0xffffffff, which would in turn require a mov for the > 0xffffffff or perhaps emitting a driver uniform/const), and since it > makes the b2f more complicated..
Are you saying your hardware returns 0/1 for false/true? If you can do integer negation as a source mod, you can just negate its uses. Alternatively, Jason's implemented a pass to "resolve" booleans to these values, which is necessary for us on i965 Gen4 and Gen5. You could probably use that. _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
