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GTE: Implement GPF instruction

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This commit is contained in:
Connor McLaughlin 2019-09-30 01:13:56 +10:00
parent 53ff458754
commit f3663fa018
2 changed files with 25 additions and 0 deletions
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24
src/pse/gte.cpp
View file

@ -314,6 +314,10 @@ void Core::ExecuteInstruction(Instruction inst)
Execute_RTPT(inst);
break;
case 0x3D:
Execute_GPF(inst);
break;
case 0x3E:
Execute_GPL(inst);
break;
@ -847,4 +851,24 @@ void Core::Execute_GPL(Instruction inst)
m_regs.FLAG.UpdateError();
}
void Core::Execute_GPF(Instruction inst)
{
m_regs.FLAG.Clear();
const u8 shift = inst.GetShift();
const bool lm = inst.lm;
// [MAC1,MAC2,MAC3] = [0,0,0] ;<--- for GPF only
// [MAC1,MAC2,MAC3] = (([IR1,IR2,IR3] * IR0) + [MAC1,MAC2,MAC3]) SAR (sf*12)
TruncateAndSetMACAndIR<1>(s64(s32(m_regs.IR1) * s32(m_regs.IR0)), shift, lm);
TruncateAndSetMACAndIR<2>(s64(s32(m_regs.IR2) * s32(m_regs.IR0)), shift, lm);
TruncateAndSetMACAndIR<3>(s64(s32(m_regs.IR3) * s32(m_regs.IR0)), shift, lm);
// Color FIFO = [MAC1/16,MAC2/16,MAC3/16,CODE], [IR1,IR2,IR3] = [MAC1,MAC2,MAC3]
PushRGBFromMAC();
m_regs.FLAG.UpdateError();
}
} // namespace GTE

1
src/pse/gte.h
View file

@ -87,6 +87,7 @@ private:
void Execute_DPCT(Instruction inst);
void Execute_DPCL(Instruction inst);
void Execute_GPL(Instruction inst);
void Execute_GPF(Instruction inst);
Regs m_regs = {};
};