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gallivm: fix comment wrt srgb accuracy.

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I think it's actually not good enough now...
This commit is contained in:
Roland Scheidegger 2013-08-03 00:24:29 +02:00
parent f9a4288bd2
commit 2d9fea95e8
1 changed files with 4 additions and 2 deletions
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6
src/gallium/auxiliary/gallivm/lp_bld_format_srgb.c
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@ -242,8 +242,10 @@ lp_build_linear_to_srgb(struct gallivm_state *gallivm,
* error metric if you'd want to tweak them, they also MUST fit with
* the crappy polynomial above for srgb->linear since it is required
* that each srgb value maps back to the same value).
* This function has an error of max +-0.17 (and we'd only require +-0.6),
* for the approximated srgb->linear values the error is naturally larger
* This function has an error of max +-0.17. Not sure this is actually
* enough, we require +-0.6 but that may include the +-0.5 from integer
* conversion. Seems to pass all relevant tests though...
* For the approximated srgb->linear values the error is naturally larger
* (+-0.42) but still accurate enough (required +-0.5 essentially).
* All in all (including min/max clamp, conversion) 15 instructions.
* FMA would help (minus 2 instructions).