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Use custom isnan implementation to avoid HLSL optimizer issues

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This adjusts the NaN replacement logic introduced in #9928 to work around the HLSL compiler optimizing away calls to isnan, which caused that functionality to not work with ubershaders on D3D11 and D3D12 (it did work with specialized shaders, despite a warning being logged for both; that warning is also now gone).  Note that the `D3DCOMPILE_IEEE_STRICTNESS` flag did not solve this issue, despite the warning suggesting that it might.

Suggested by @kayru and @jamiehayes.
This commit is contained in:
Pokechu22
2021-09-07 17:27:18 -07:00
parent 282fda1530
commit 52c82733f6
4 changed files with 30 additions and 7 deletions
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10
Source/Core/VideoCommon/VertexShaderGen.cpp
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@ -96,7 +96,9 @@ ShaderCode GenerateVertexShaderCode(APIType api_type, const ShaderHostConfig& ho
out.Write("struct VS_OUTPUT {{\n");
GenerateVSOutputMembers(out, api_type, uid_data->numTexGens, host_config, "");
out.Write("}};\n");
out.Write("}};\n\n");
WriteIsNanHeader(out, api_type);
if (api_type == APIType::OpenGL || api_type == APIType::Vulkan)
{
@ -335,9 +337,9 @@ ShaderCode GenerateVertexShaderCode(APIType api_type, const ShaderHostConfig& ho
// Convert NaNs to 1 - needed to fix eyelids in Shadow the Hedgehog during cutscenes
// See https://bugs.dolphin-emu.org/issues/11458
out.Write("// Convert NaN to 1\n");
out.Write("if (isnan(coord.x)) coord.x = 1.0;\n");
out.Write("if (isnan(coord.y)) coord.y = 1.0;\n");
out.Write("if (isnan(coord.z)) coord.z = 1.0;\n");
out.Write("if (dolphin_isnan(coord.x)) coord.x = 1.0;\n");
out.Write("if (dolphin_isnan(coord.y)) coord.y = 1.0;\n");
out.Write("if (dolphin_isnan(coord.z)) coord.z = 1.0;\n");
// first transformation
switch (texinfo.texgentype)