I've been doing quite a bit of work towards getting rid of the EASY_PFS_INSTR and co. macros. My aim is to have a function similar to i915's i915_emit_arith, that will handle swizzling/negation transparently. If all goes to plan, I should have something that works okay in the next couple of days.
r300 doesn't support arbitrary swizzling in fragment programs like it does for vertex programs. Unsupported swizzles need to be done in multiple instructions.
As for the SRC0A in FPI0, The W component is replicated into the XYZ registers somehow, but I'm not exactly sure what components W gets copied into.
Cheers, Ben Skeggs.
Jerome Glisse wrote:
Hi,
I was playing with pixel shader, trying to improve support of texenv & co... But i didn't success to find a way to do swizzle.
If i ask for SRC0A in FPI0 is the A component replicated ? Anyone so far played with all that ?
By the way i take a quick look to i915 code, and like Keith said maybe (i think he says something about that in a previous mail :)) we could have something generic enought for graphics cards with pixel shader ? Thus having less code to debug & do...
best, Jerome Glisse
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