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shader: make the f32 clamp modifier turn NaN into 0

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NeySlim authored and nmzik committed 2026-10-17 04:09:53 +02:00
1 parent 42bb0da520
commit 4f1f3b1bb3
2 files changed
+61 -2
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterAlu.cpp
+5 -2
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@@ -230,8 +230,11 @@ uint32_t EmitPackFloat2x16Rtz(EmitterState& state, uint32_t arg0, uint32_t arg1)
}
uint32_t EmitFPSaturate32(EmitterState& state, uint32_t arg0) {
return EmitExt(state, TypeF32(state), GLSLstd450FClamp,
{arg0, ConstantF32(state, 0), ConstantF32(state, 0x3f800000u)});
// The clamp modifier runs in DX10 clamp mode: NaN becomes 0. FClamp leaves NaN undefined.
const auto clamped = EmitExt(state, TypeF32(state), GLSLstd450FClamp,
{arg0, ConstantF32(state, 0), ConstantF32(state, 0x3f800000u)});
return Select(state, TypeF32(state), EmitClassifyF32(state, arg0).nan, ConstantF32(state, 0),
clamped);
}
uint32_t EmitSMulHi(EmitterState& state, uint32_t arg0, uint32_t arg1) {