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GTE: Implement NCS/NCT

This commit is contained in:
Connor McLaughlin 2019-10-04 17:26:56 +10:00
parent 6a7ed5d8bc
commit 13389caa60
2 changed files with 46 additions and 0 deletions
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43
src/core/gte.cpp
View File

@ -294,6 +294,14 @@ void Core::ExecuteInstruction(Instruction inst)
Execute_NCCS(inst);
break;
case 0x1E:
Execute_NCS(inst);
break;
case 0x20:
Execute_NCT(inst);
break;
case 0x28:
Execute_SQR(inst);
break;
@ -599,6 +607,41 @@ void Core::InterpolateColor(s64 in_MAC1, s64 in_MAC2, s64 in_MAC3, u8 shift, boo
TruncateAndSetMACAndIR<3>(s64(s32(m_regs.IR3) * s32(m_regs.IR0)) + in_MAC3, shift, lm);
}
void Core::NCS(const s16 V[3], u8 shift, bool lm)
{
// [IR1,IR2,IR3] = [MAC1,MAC2,MAC3] = (LLM*V0) SAR (sf*12)
MulMatVec(m_regs.LLM, V[0], V[1], V[2], shift, lm);
// [IR1,IR2,IR3] = [MAC1,MAC2,MAC3] = (BK*1000h + LCM*IR) SAR (sf*12)
MulMatVec(m_regs.LCM, m_regs.BK, m_regs.IR1, m_regs.IR2, m_regs.IR3, shift, lm);
// Color FIFO = [MAC1/16,MAC2/16,MAC3/16,CODE], [IR1,IR2,IR3] = [MAC1,MAC2,MAC3]
PushRGBFromMAC();
}
void Core::Execute_NCS(Instruction inst)
{
m_regs.FLAG.Clear();
NCS(m_regs.V0, inst.GetShift(), inst.lm);
m_regs.FLAG.UpdateError();
}
void Core::Execute_NCT(Instruction inst)
{
m_regs.FLAG.Clear();
const u8 shift = inst.GetShift();
const bool lm = inst.lm;
NCS(m_regs.V0, shift, lm);
NCS(m_regs.V1, shift, lm);
NCS(m_regs.V2, shift, lm);
m_regs.FLAG.UpdateError();
}
void Core::NCCS(const s16 V[3], u8 shift, bool lm)
{
// [IR1,IR2,IR3] = [MAC1,MAC2,MAC3] = (LLM*V0) SAR (sf*12)

3
src/core/gte.h
View File

@ -71,6 +71,7 @@ private:
void InterpolateColor(s64 in_MAC1, s64 in_MAC2, s64 in_MAC3, u8 shift, bool lm);
void RTPS(const s16 V[3], bool sf, bool lm, bool last);
void NCS(const s16 V[3], u8 shift, bool lm);
void NCCS(const s16 V[3], u8 shift, bool lm);
void NCDS(const s16 V[3], u8 shift, bool lm);
void DPCS(const u8 color[3], u8 shift, bool lm);
@ -81,6 +82,8 @@ private:
void Execute_SQR(Instruction inst);
void Execute_AVSZ3(Instruction inst);
void Execute_AVSZ4(Instruction inst);
void Execute_NCS(Instruction inst);
void Execute_NCT(Instruction inst);
void Execute_NCCS(Instruction inst);
void Execute_NCCT(Instruction inst);
void Execute_NCDS(Instruction inst);