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[d3d9] FF: Prevent specular highlights on the back of geometry
Fixes the Wine test "test_specular_lighting".
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@ -1331,6 +1331,8 @@ namespace dxvk {
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uint32_t midDot = m_module.opDot(m_floatType, normal, mid);
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midDot = m_module.opFClamp(m_floatType, midDot, m_module.constf32(0.0f), m_module.constf32(1.0f));
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uint32_t doSpec = m_module.opFOrdGreaterThan(bool_t, midDot, m_module.constf32(0.0f));
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doSpec = m_module.opLogicalAnd(bool_t, doSpec, m_module.opFOrdGreaterThan(m_floatType, hitDot, m_module.constf32(0.0f)));
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uint32_t specularness = m_module.opPow(m_floatType, midDot, m_vs.constants.materialPower);
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specularness = m_module.opFMul(m_floatType, specularness, atten);
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specularness = m_module.opSelect(m_floatType, doSpec, specularness, m_module.constf32(0.0f));
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