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[dxbc] Reciprocate W component of SV_POSITION in pixel shaders 

Fixes the fog effect in Nier:Automata, as well as some major
visual issues in Rise of the Tomb Raider, and potentially
other games.
This commit is contained in:
Philip Rebohle 2018-04-05 20:10:00 +02:00
parent 4d28f765df
commit bd17be472d
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GPG Key ID: C8CC613427A31C99
1 changed files with 17 additions and 4 deletions
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21
src/dxbc/dxbc_compiler.cpp
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@ -5002,12 +5002,25 @@ namespace dxvk {
}
DxbcRegisterPointer ptrIn;
ptrIn.type.ctype = DxbcScalarType::Float32;
ptrIn.type.ccount = 4;
ptrIn.type = { DxbcScalarType::Float32, 4 };
ptrIn.id = m_ps.builtinFragCoord;
return emitRegisterExtract(
emitValueLoad(ptrIn), mask);
// The X, Y and Z components of the SV_POSITION semantic
// are identical to Vulkan's FragCoord builtin, but we
// need to compute the reciprocal of the W component.
DxbcRegisterValue fragCoord = emitValueLoad(ptrIn);
uint32_t componentIndex = 3;
uint32_t t_f32 = m_module.defFloatType(32);
uint32_t v_wComp = m_module.opCompositeExtract(t_f32, fragCoord.id, 1, &componentIndex);
v_wComp = m_module.opFDiv(t_f32, m_module.constf32(1.0f), v_wComp);
fragCoord.id = m_module.opCompositeInsert(
getVectorTypeId(fragCoord.type),
v_wComp, fragCoord.id,
1, &componentIndex);
return emitRegisterExtract(fragCoord, mask);
} break;
case DxbcSystemValue::IsFrontFace: {