Rob Clark <robdcl...@gmail.com> writes: > From: Rob Clark <robcl...@freedesktop.org> > > TGSI->TGSI pass, extracted from freedreno. Currently provides the > following lower support, to help drivers emulate unsupported opcodes > or features: > > Individual opcodes: > DST, XPD, SCS, LRP, FRC, POW, LIT, EXP, LOG, DP4, DP3, DPH, > DP2, DP2A > > Also supported, although it is up to the driver to manage it's own > shader variants: > + two-sided-color > + texture coord saturate (ie. to emulate GL_CLAMP) > > All of the lowering operations are opt-in so a driver can pick and > choose what it wants.
This is very useful to me, as it got me +15 piglit tests, and -70 lines of code. I'm not using FRC because I can do it in just as many instructions as my FLR, and I'm not using LRP because I'm doing the (c + a * (b - c)) version of things, but I'm using all the rest of those opcodes. I'm not cloning the tokens for shader variants yet, so I'm still doing my own texcoord clamping. However, I do want to use the two-side-color lowering, so I'll probably start cloning for variants, at which point I'll use the texcoord bits, too. However, I'd like to see the code first have a commit that's just a raw copy, so that git log --follow can track where the code came from. I've pushed a branch called "robclark-lowering" to my mesa tree if maybe you want to ack that starting commit?
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