Xargon/Duckstation
1
0
Fork 0
mirror of https://github.com/RetroDECK/Duckstation.git synced 2024-11-25 23:25:41 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

GTE: Special case for RTPS

Browse source
This commit is contained in:
Connor McLaughlin 2019-09-26 02:43:28 +10:00
parent d885abc528
commit 4d1837acb1
3 changed files with 41 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

52
src/pse/gte.cpp
View file

@ -388,15 +388,37 @@ void Core::PushRGB(u8 r, u8 g, u8 b, u8 c)
m_regs.RGB2 = ZeroExtend32(r) | (ZeroExtend32(g) << 8) | (ZeroExtend32(b) << 16) | (ZeroExtend32(c) << 24);
}
void Core::RTPS(const s16 V[3], bool sf, bool lm)
void Core::RTPS(const s16 V[3], bool sf, bool lm, bool last)
{
const u8 shift = sf ? 12 : 0;
#define dot3(i) \
CheckMACResult<i + 1>( \
(s64(m_regs.TR[i]) << 12) + \
CheckMACResult<i + 1>(CheckMACResult<i + 1>(CheckMACResult<i + 1>(s64(s32(m_regs.RT[i][0]) * s32(V[0]))) + \
s64(s32(m_regs.RT[i][1]) * s32(V[1]))) + \
s64(s32(m_regs.RT[i][2]) * s32(V[2]))))
// IR1 = MAC1 = (TRX*1000h + RT11*VX0 + RT12*VY0 + RT13*VZ0) SAR (sf*12)
// IR2 = MAC2 = (TRY*1000h + RT21*VX0 + RT22*VY0 + RT23*VZ0) SAR (sf*12)
// IR3 = MAC3 = (TRZ*1000h + RT31*VX0 + RT32*VY0 + RT33*VZ0) SAR (sf*12)
MulMatVec(m_regs.RT, m_regs.TR, V[0], V[1], V[2], sf ? 12 : 0, lm);
const s64 x = dot3(0);
const s64 y = dot3(1);
const s64 z = dot3(2);
TruncateAndSetMAC<1>(x, shift);
TruncateAndSetMAC<2>(y, shift);
TruncateAndSetMAC<3>(z, shift);
TruncateAndSetIR<1>(m_regs.MAC1, lm);
TruncateAndSetIR<2>(m_regs.MAC2, lm);
// The command does saturate IR1,IR2,IR3 to -8000h..+7FFFh (regardless of lm bit). When using RTP with sf=0, then the
// IR3 saturation flag (FLAG.22) gets set <only> if "MAC3 SAR 12" exceeds -8000h..+7FFFh (although IR3 is saturated
// when "MAC3" exceeds -8000h..+7FFFh).
TruncateAndSetIR<3>(m_regs.MAC3, false);
m_regs.dr32[11] = std::clamp(m_regs.MAC3, lm ? 0 : IR123_MIN_VALUE, IR123_MAX_VALUE);
#undef dot3
// SZ3 = MAC3 SAR ((1-sf)*12) ;ScreenZ FIFO 0..+FFFFh
PushSZ(sf ? m_regs.MAC3 : (m_regs.MAC3 >> 12));
PushSZ(s32(z >> 12));
s32 result;
if (m_regs.SZ3 == 0)
@ -416,18 +438,22 @@ void Core::RTPS(const s16 V[3], bool sf, bool lm)
// 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
// MAC0=(((H*20000h/SZ3)+1)/2)*DQA+DQB, IR0=MAC0/1000h ;Depth cueing 0..+1000h
const s32 Sx = s32(TruncateAndSetMAC<0>(s64(result) * s64(m_regs.IR1) + s64(m_regs.OFX), 16));
const s32 Sy = s32(TruncateAndSetMAC<0>(s64(result) * s64(m_regs.IR2) + s64(m_regs.OFY), 16));
const s32 Sz = s32(TruncateAndSetMAC<0>(s64(result) * s64(m_regs.DQA) + s64(m_regs.DQB), 12));
PushSXY(Sx, Sy);
TruncateAndSetIR<0>(Sz, true);
const s64 Sx = TruncateAndSetMAC<0>(s64(result) * s64(m_regs.IR1) + s64(m_regs.OFX), 0);
const s64 Sy = TruncateAndSetMAC<0>(s64(result) * s64(m_regs.IR2) + s64(m_regs.OFY), 0);
PushSXY(s32(Sx >> 16), s32(Sy >> 16));
if (last)
{
// MAC0=(((H*20000h/SZ3)+1)/2)*DQA+DQB, IR0=MAC0/1000h ;Depth cueing 0..+1000h
const s64 Sz = TruncateAndSetMAC<0>(s64(result) * s64(m_regs.DQA) + s64(m_regs.DQB), 0);
TruncateAndSetIR<0>(s32(Sz >> 12), true);
}
}
void Core::Execute_RTPS(Instruction inst)
{
m_regs.FLAG.Clear();
RTPS(m_regs.V0, inst.sf, inst.lm);
RTPS(m_regs.V0, inst.sf, inst.lm, true);
m_regs.FLAG.UpdateError();
}
@ -436,9 +462,9 @@ void Core::Execute_RTPT(Instruction inst)
m_regs.FLAG.Clear();
const bool sf = inst.sf;
RTPS(m_regs.V0, sf, inst.lm);
RTPS(m_regs.V1, sf, inst.lm);
RTPS(m_regs.V2, sf, inst.lm);
RTPS(m_regs.V0, sf, inst.lm, false);
RTPS(m_regs.V1, sf, inst.lm, false);
RTPS(m_regs.V2, sf, inst.lm, true);
m_regs.FLAG.UpdateError();
}

2
src/pse/gte.h
View file

@ -59,7 +59,7 @@ private:
// 3x3 matrix * 3x1 vector with translation, updates MAC[1-3] and IR[1-3]
void MulMatVec(const s16 M[3][3], const s32 T[3], const s16 Vx, const s16 Vy, const s16 Vz, u8 shift, bool lm);
void RTPS(const s16 V[3], bool sf, bool lm);
void RTPS(const s16 V[3], bool sf, bool lm, bool last);
void NCCS(const s16 V[3], bool sf, bool lm);
void NCDS(const s16 V[3], bool sf, bool lm);

2
src/pse/gte.inl
View file

@ -48,7 +48,7 @@ s16 GTE::Core::TruncateAndSetIR(s32 value, bool lm)
{
constexpr s32 MIN_VALUE = (index == 0) ? IR0_MIN_VALUE : IR123_MIN_VALUE;
constexpr s32 MAX_VALUE = (index == 0) ? IR0_MAX_VALUE : IR123_MAX_VALUE;
const s32 actual_min_value = lm ? 0 : -0x8000;
const s32 actual_min_value = lm ? 0 : MIN_VALUE;
if (value < actual_min_value)
{
value = actual_min_value;