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| author | Marek Olšák <marek.olsak@amd.com> | 2016-12-02 16:37:22 +0100 |
|---|---|---|
| committer | Marek Olšák <marek.olsak@amd.com> | 2016-12-07 18:46:54 +0100 |
| commit | 132b69c4edb824c70c98f8937c63e49b04f3adff (patch) | |
| tree | 4ecb36a0bc0b9743c9795c79619a11f171ac8a9e | |
| parent | 4b0d8b2da09c4d3be675d4312a9efd832126b98c (diff) | |
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>
| -rw-r--r-- | src/mesa/state_tracker/st_atom_sampler.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/mesa/state_tracker/st_atom_sampler.c b/src/mesa/state_tracker/st_atom_sampler.c index 4568630fd2c..daf98c3abb0 100644 --- a/src/mesa/state_tracker/st_atom_sampler.c +++ b/src/mesa/state_tracker/st_atom_sampler.c @@ -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; |