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anv: Only enable EWA LOD algorithm when doing anisotropic filtering.

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Updated documentation renames "Anisotropic Algorithm" to "LOD Algorithm"
and adds a note for Gen9+ saying "The EWA Algorithm should only be
enabled for Anisotropic Filtering modes." and indicating that the extra
accuracy shouldn't be necessary for other modes, and comes at a cost.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Kenneth Graunke
2019-12-16 21:15:15 -08:00
parent c0c899cf78
commit defb3a9465
1 changed files with 2 additions and 1 deletions
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src/intel/vulkan/genX_state.c
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@@ -506,7 +506,8 @@ VkResult genX(CreateSampler)(
.MagModeFilter = vk_to_gen_tex_filter(mag_filter, pCreateInfo->anisotropyEnable), .MagModeFilter = vk_to_gen_tex_filter(mag_filter, pCreateInfo->anisotropyEnable),
.MinModeFilter = vk_to_gen_tex_filter(min_filter, pCreateInfo->anisotropyEnable), .MinModeFilter = vk_to_gen_tex_filter(min_filter, pCreateInfo->anisotropyEnable),
.TextureLODBias = anv_clamp_f(pCreateInfo->mipLodBias, -16, 15.996), .TextureLODBias = anv_clamp_f(pCreateInfo->mipLodBias, -16, 15.996),
.AnisotropicAlgorithm = EWAApproximation, .AnisotropicAlgorithm =
pCreateInfo->anisotropyEnable ? EWAApproximation : LEGACY,
.MinLOD = anv_clamp_f(pCreateInfo->minLod, 0, 14), .MinLOD = anv_clamp_f(pCreateInfo->minLod, 0, 14),
.MaxLOD = anv_clamp_f(pCreateInfo->maxLod, 0, 14), .MaxLOD = anv_clamp_f(pCreateInfo->maxLod, 0, 14),
.ChromaKeyEnable = 0, .ChromaKeyEnable = 0,