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st/mesa: round lod_bias to a multiple of 1/256 

This reduces the number of sampler states 3.6x in Batman Arkham: Origins.
(from ~7200 to ~2000)

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
This commit is contained in:
Marek Olšák 2016-12-02 16:37:22 +01:00
parent 4b0d8b2da0
commit 132b69c4ed
1 changed files with 6 additions and 0 deletions
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6
src/mesa/state_tracker/st_atom_sampler.c
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@ -159,6 +159,12 @@ convert_sampler(struct st_context *st,
sampler->normalized_coords = 1;
sampler->lod_bias = ctx->Texture.Unit[texUnit].LodBias + msamp->LodBias;
/* Reduce the number of states by allowing only the values that AMD GCN
* can represent. Apps use lod_bias for smooth transitions to bigger mipmap
* levels.
*/
sampler->lod_bias = CLAMP(sampler->lod_bias, -16, 16);
sampler->lod_bias = floorf(sampler->lod_bias * 256) / 256;
sampler->min_lod = MAX2(msamp->MinLod, 0.0f);
sampler->max_lod = msamp->MaxLod;