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rsx/fp: Fix precision clamping on MAD instruction

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kd-11 2020-05-16 20:23:35 +03:00 • committed by kd-11
parent a8bca8b2ed
commit 37df3c6f96
1 changed files with 15 additions and 0 deletions
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15
rpcs3/Emu/RSX/Common/FragmentProgramDecompiler.cpp
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@ -644,6 +644,21 @@ template<typename T> std::string FragmentProgramDecompiler::GetSRC(T src)
break;
}
if (apply_precision_modifier && !src.neg)
{
if constexpr (!std::is_same<T, SRC0>::value)
{
if (dst.opcode == RSX_FP_OPCODE_MAD)
{
// Hardware tests show special behavior on MAD operation
// Only src0 obeys precision modifier (sat tested)
// Results: 1 * 100 + 0 = 100, 1 * 1 + 100 = 100, 100 * 1 + 0 = 1
// NOTE: Neg modifier seems to break this rule; 1 * -100 + 0 = -1 not -99
apply_precision_modifier = false;
}
}
}
static const char f[4] = { 'x', 'y', 'z', 'w' };
std::string swizzle;