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shader: honor front-face input format

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shadowbeat070
2026-10-16 12:49:52 +02:00
parent 3ff6606fcb
commit 57b161019d
4 changed files with 108 additions and 6 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterFlow.cpp
+6 -3
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@@ -52,9 +52,12 @@ uint32_t EmitBuiltinU32(EmitterState& state, IR::StageInputKind kind, uint32_t c
const auto value = state.builder.AllocateId();
const auto bits = state.builder.AllocateId();
state.builder.AddFunction(spv::OpLoad, TypeBool(state), value, variable);
// PS5 initializes v_front_face with float +1.0/-1.0 bits.
state.builder.AddFunction(spv::OpSelect, TypeU32(state), bits, value,
ConstantU32(state, 0x3f800000u), ConstantU32(state, 0xbf800000u));
// SPI_BARYC_CNTL.FRONT_FACE_ALL_BITS selects uint masks or float +/-1.
const bool all_bits =
state.input_info.pixel != nullptr && state.input_info.pixel->ps_front_face_all_bits;
const auto front = ConstantU32(state, all_bits ? 0xffffffffu : 0x3f800000u);
const auto back = ConstantU32(state, all_bits ? 0u : 0xbf800000u);
state.builder.AddFunction(spv::OpSelect, TypeU32(state), bits, value, front, back);
return bits;
}
if (kind == IR::StageInputKind::VertexIndex || kind == IR::StageInputKind::InstanceIndex ||