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Fix SPIR-V float control contract (Preserve FP32 Inf and NaN)

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nmzik
2026-08-16 00:23:56 +02:00
parent 0df20eb300
commit b4809e7170
4 changed files with 37 additions and 0 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterModule.cpp
+5
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@@ -486,6 +486,7 @@ void EmitHeaderAndTypes(EmitterState& state) {
state.builder.AddCapability({CapabilitySampled1D});
state.builder.AddCapability({CapabilityImage1D});
state.builder.AddCapability({CapabilityImageQuery});
state.builder.AddCapability({CapabilitySignedZeroInfNanPreserve});
if (state.needs_image_gather_extended) {
state.builder.AddCapability({CapabilityImageGatherExtended});
}
@@ -509,10 +510,14 @@ void EmitHeaderAndTypes(EmitterState& state) {
state.builder.AddCapability({CapabilityComputeDerivativeGroupQuadsKHR});
state.builder.AddExtension("SPV_KHR_compute_shader_derivatives");
}
state.builder.AddExtension("SPV_KHR_float_controls");
state.builder.AddExtInstImport(state.glsl_std450, "GLSL.std.450");
state.builder.AddMemoryModel({AddressingModelLogical, MemoryModelGLSL450});
state.builder.AddEntryPoint(ExecutionModelForStage(state.stage), state.main_func, "main",
state.interface_variables);
// GCN/RDNA arithmetic preserves 32-bit signed zero, infinity, and NaN. Declaring that
// contract prevents host compilers from treating synthesized IEEE values as finite.
state.builder.AddExecutionMode({state.main_func, ExecutionModeSignedZeroInfNanPreserve, 32u});
if (state.stage == ShaderType::Compute) {
uint32_t local_x = state.needs_compute_derivatives ? 2u : 1u;
uint32_t local_y = state.needs_compute_derivatives ? 2u : 1u;