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llvmpipe: fix 4-bit output scaling.

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This is overkill, but hey 4-bits per channel is hardly something to
care about.

(Suggestions welcome for a better version).

Fixes:
dEQP-GLES2.functional.fbo.render.*rgba4*

Reviewed-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12001>
This commit is contained in:
Dave Airlie
2020-07-20 15:41:27 +10:00
committed by Marge Bot
parent 22a332f5ac
commit 29f4931b52
1 changed files with 9 additions and 0 deletions
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9
src/gallium/drivers/llvmpipe/lp_state_fs.c
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@@ -1712,6 +1712,15 @@ scale_bits(struct gallivm_state *gallivm,
int delta_bits = src_bits - dst_bits;
if (delta_bits <= dst_bits) {
if (dst_bits == 4) {
struct lp_type flt_type = lp_type_float_vec(32, src_type.length * 32);
result = lp_build_unsigned_norm_to_float(gallivm, src_bits, flt_type, src);
result = lp_build_clamped_float_to_unsigned_norm(gallivm, flt_type, dst_bits, result);
return result;
}
/*
* Approximate the rescaling with a single shift.
*