From 132b69c4edb824c70c98f8937c63e49b04f3adff Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marek=20Ol=C5=A1=C3=A1k?= Date: Fri, 2 Dec 2016 16:37:22 +0100 Subject: [PATCH] st/mesa: round lod_bias to a multiple of 1/256 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This reduces the number of sampler states 3.6x in Batman Arkham: Origins. (from ~7200 to ~2000) Reviewed-by: Nicolai Hähnle --- src/mesa/state_tracker/st_atom_sampler.c | 6 ++++++ 1 file changed, 6 insertions(+) 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;