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shader: keep native rounding consistent in mixed-precision programs

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Co-authored-by: Çağatay Güçlü <33038942+defektu@users.noreply.github.com>
This commit is contained in:
nmzik
2026-10-04 04:39:57 +04:00
parent b4d32394b6
commit 7992aecb7c
3 changed files with 90 additions and 7 deletions
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src/graphics/presentation/window/vulkanWindow.cpp
+1 -2
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@@ -560,8 +560,7 @@ static vk::Device VulkanCreateDevice(GraphicContext& graphics,
device_features.shaderInt64 = VK_TRUE;
device_features.shaderFloat64 =
supported_features2.features.shaderFloat64 &&
float_controls.shaderSignedZeroInfNanPreserveFloat64 &&
float_controls.shaderRoundingModeRTEFloat32;
float_controls.shaderSignedZeroInfNanPreserveFloat64;
// if (device_features.shaderFloat64 && !float_controls.shaderDenormPreserveFloat64) {
// Log::WriteToConsoleAndLog(
// "WARNING: Vulkan device does not guarantee FP64 denormal preservation; "
src/graphics/shader/recompiler/backend/spirv/spirvEmitterModule.cpp
+1 -3
View File
@@ -738,15 +738,13 @@ void DefineModule(EmitterState& state) {
if (state.requirements.float64) {
EXIT_NOT_IMPLEMENTED(state.program.stage == ShaderType::Compute &&
state.input_info.compute->float_mode != 0xc0);
// MODE=0xc0 uses round-to-nearest-even and preserves FP64 input/output denormals.
// Use native rounding for MODE=0xc0, consistent with ordinary FP32 arithmetic.
state.builder.RequireCapability(spv::CapabilityFloat64);
state.builder.RequireCapability(spv::CapabilityRoundingModeRTE);
state.builder.AddExecutionMode(state.main_func, spv::ExecutionModeSignedZeroInfNanPreserve,
64u);
// FP64 denormal preservation is temporarily disabled.
// state.builder.RequireCapability(spv::CapabilityDenormPreserve);
// state.builder.AddExecutionMode(state.main_func, spv::ExecutionModeDenormPreserve, 64u);
state.builder.AddExecutionMode(state.main_func, spv::ExecutionModeRoundingModeRTE, 32u);
}
if (const auto* cs = ShaderWorkgroupInput(state.program.stage, state.input_info)) {
uint32_t local_x = state.requirements.compute_derivatives ? 2u : 1u;