Mesa (master): st/mesa: use roundf instead of floorf for lod-bias rounding

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Module: Mesa
Branch: master
Commit: 7685c37bf47104497d70c4580abb9e050ea8100f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=7685c37bf47104497d70c4580abb9e050ea8100f

Author: Erik Faye-Lund <erik.faye-lund at collabora.com>
Date:   Mon Sep 28 16:11:38 2020 +0200

st/mesa: use roundf instead of floorf for lod-bias rounding

There's no good reason not to use a symmetric rounding mode here. This
fixes the following GL CTS case for me:

GTF-GL33.gtf21.GL3Tests.texture_lod_bias.texture_lod_bias_all

Fixes: 132b69c4edb ("st/mesa: round lod_bias to a multiple of 1/256")
Reviewed-by: Marek Olšák <marek.olsak at amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6892>

---

 src/mesa/state_tracker/st_atom_sampler.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mesa/state_tracker/st_atom_sampler.c b/src/mesa/state_tracker/st_atom_sampler.c
index 0c188c104c1..0d99eae6e61 100644
--- a/src/mesa/state_tracker/st_atom_sampler.c
+++ b/src/mesa/state_tracker/st_atom_sampler.c
@@ -132,7 +132,7 @@ st_convert_sampler(const struct st_context *st,
     * levels.
     */
    sampler->lod_bias = CLAMP(sampler->lod_bias, -16, 16);
-   sampler->lod_bias = floorf(sampler->lod_bias * 256) / 256;
+   sampler->lod_bias = roundf(sampler->lod_bias * 256) / 256;
 
    sampler->min_lod = MAX2(msamp->MinLod, 0.0f);
    sampler->max_lod = msamp->MaxLod;