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GTE: Add widescreen hack

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This commit is contained in:
Connor McLaughlin
2020-07-18 00:25:08 +10:00
parent 5f76140aa5
commit 5c1c467e38
8 changed files with 28 additions and 6 deletions
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5
src/core/gte.cpp
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@ -578,7 +578,10 @@ void Core::RTPS(const s16 V[3], u8 shift, bool lm, bool last)
// MAC0=(((H*20000h/SZ3)+1)/2)*IR1+OFX, SX2=MAC0/10000h ;ScrX FIFO -400h..+3FFh
// MAC0=(((H*20000h/SZ3)+1)/2)*IR2+OFY, SY2=MAC0/10000h ;ScrY FIFO -400h..+3FFh
const s64 result = static_cast<s64>(ZeroExtend64(UNRDivide(m_regs.H, m_regs.SZ3)));
const s64 Sx = s64(result) * s64(m_regs.IR1) + s64(m_regs.OFX);
// (4 / 3) / (16 / 9) -> 0.75 -> (3 / 4)
const s64 Sx = m_widescreen_hack ? ((((s64(result) * s64(m_regs.IR1)) * s64(3)) / s64(4)) + s64(m_regs.OFX)) :
(s64(result) * s64(m_regs.IR1) + s64(m_regs.OFX));
const s64 Sy = s64(result) * s64(m_regs.IR2) + s64(m_regs.OFY);
CheckMACOverflow<0>(Sx);
CheckMACOverflow<0>(Sy);