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GTE: Implement GPL instruction

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This commit is contained in:
Connor McLaughlin 2019-09-28 01:28:09 +10:00
parent 8aed0cc174
commit a216c8414c
2 changed files with 35 additions and 0 deletions
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34
src/pse/gte.cpp
View file

@ -314,6 +314,10 @@ void Core::ExecuteInstruction(Instruction inst)
Execute_RTPT(inst);
break;
case 0x3E:
Execute_GPL(inst);
break;
case 0x3F:
Execute_NCCT(inst);
break;
@ -834,4 +838,34 @@ void Core::Execute_DPCL(Instruction inst)
m_regs.FLAG.UpdateError();
}
void Core::Execute_GPL(Instruction inst)
{
m_regs.FLAG.Clear();
const u8 shift = inst.GetShift();
const bool lm = inst.lm;
// [MAC1,MAC2,MAC3] = [MAC1,MAC2,MAC3] SHL (sf*12) ;<--- for GPL only
if (inst.sf)
{
TruncateAndSetMAC<1>(s64(m_regs.MAC1), shift);
TruncateAndSetMAC<2>(s64(m_regs.MAC2), shift);
TruncateAndSetMAC<3>(s64(m_regs.MAC3), shift);
}
// [MAC1,MAC2,MAC3] = (([IR1,IR2,IR3] * IR0) + [MAC1,MAC2,MAC3]) SAR (sf*12)
TruncateAndSetMAC<1>((s64(s32(m_regs.IR1) * s32(m_regs.IR0)) + s64(m_regs.MAC1)) >> shift, 0);
TruncateAndSetMAC<2>((s64(s32(m_regs.IR2) * s32(m_regs.IR0)) + s64(m_regs.MAC2)) >> shift, 0);
TruncateAndSetMAC<3>((s64(s32(m_regs.IR3) * s32(m_regs.IR0)) + s64(m_regs.MAC3)) >> shift, 0);
// Color FIFO = [MAC1/16,MAC2/16,MAC3/16,CODE], [IR1,IR2,IR3] = [MAC1,MAC2,MAC3]
PushRGB(TruncateRGB<0>(m_regs.MAC1 / 16), TruncateRGB<1>(m_regs.MAC2 / 16), TruncateRGB<2>(m_regs.MAC3 / 16),
m_regs.RGBC[3]);
TruncateAndSetIR<1>(m_regs.MAC1, lm);
TruncateAndSetIR<2>(m_regs.MAC2, lm);
TruncateAndSetIR<3>(m_regs.MAC3, lm);
m_regs.FLAG.UpdateError();
}
} // namespace GTE

1
src/pse/gte.h
View file

@ -78,6 +78,7 @@ private:
void Execute_DPCS(Instruction inst);
void Execute_DPCT(Instruction inst);
void Execute_DPCL(Instruction inst);
void Execute_GPL(Instruction inst);
Regs m_regs = {};
};