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shader_decompiler: Improve Accuracy of Attribute Interpolation.

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This commit is contained in:
Fernando Sahmkow 2019-02-12 21:14:39 -04:00 • committed by FernandoS27
parent cfb2483744
commit e29f546bb7
6 changed files with 74 additions and 38 deletions
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15
src/video_core/shader/decode/other.cpp
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@ -135,7 +135,18 @@ u32 ShaderIR::DecodeOther(NodeBlock& bb, u32 pc) {
instr.ipa.sample_mode.Value()};
const Node attr = GetInputAttribute(attribute.index, attribute.element, input_mode);
const Node value = GetSaturatedFloat(attr, instr.ipa.saturate);
Node value = attr;
const Tegra::Shader::Attribute::Index index = attribute.index.Value();
if (index >= Tegra::Shader::Attribute::Index::Attribute_0 &&
index <= Tegra::Shader::Attribute::Index::Attribute_31) {
// TODO(Blinkhawk): There are cases where a perspective attribute use PASS.
// In theory by setting them as perspective, OpenGL does the perspective correction.
// A way must figured to reverse the last step of it.
if (input_mode.interpolation_mode == Tegra::Shader::IpaInterpMode::Multiply) {
value = Operation(OperationCode::FMul, PRECISE, value, GetRegister(instr.gpr20));
}
}
value = GetSaturatedFloat(value, instr.ipa.saturate);
SetRegister(bb, instr.gpr0, value);
break;
@ -175,4 +186,4 @@ u32 ShaderIR::DecodeOther(NodeBlock& bb, u32 pc) {
return pc;
}
} // namespace VideoCommon::Shader
} // namespace VideoCommon::Shader