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shader: select the primary mip for linear explicit-LOD gathers

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nmzik
2026-10-18 20:50:03 +02:00
parent 8b51370ca1
commit ac3711ce7c
4 changed files with 41 additions and 23 deletions
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src/graphics/shader/recompiler/ir/passes/ResourceMaterialization.cpp
+6 -4
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@@ -1671,11 +1671,13 @@ bool MaterializeResources(const ResourcePlan& program, const SrtRuntime& runtime
if (program.info.samplers[base_index].gather_lod) {
const auto control = snapshot.samplers[i].dwords[2];
const auto filter = (control >> 26u) & 3u;
// MipNone always selects the base level. Explicit point gathers currently require
// encoded-zero primary and secondary bias; linear primary-mip selection is unsupported.
if (filter > 1u || (filter == 1u && (control & 0xfffffu) != 0u)) {
const auto perf_mip = (snapshot.samplers[i].dwords[1] >> 24u) & 15u;
// MipNone always selects the base level. Point/linear selection requires zero
// primary/secondary bias; linear mip snapping is not implemented.
if (filter > 2u || (filter != 0u && (control & 0xfffffu) != 0u) ||
(filter == 2u && perf_mip != 0u)) {
return SpecializationFail(
"explicit-LOD gather requires mip filtering None or Point with zero LOD biases");
"explicit-LOD gather requires None, unbiased Point, or unbiased Linear without mip snapping");
}
}
}