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GTE: Implement CDP

This commit is contained in:
Connor McLaughlin 2019-10-04 17:38:31 +10:00
parent b133f96c24
commit 7c600ed6fa
2 changed files with 31 additions and 0 deletions
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30
src/core/gte.cpp
View File

@ -286,6 +286,10 @@ void Core::ExecuteInstruction(Instruction inst)
Execute_NCDS(inst);
break;
case 0x14:
Execute_CDP(inst);
break;
case 0x16:
Execute_NCCT(inst);
break;
@ -827,6 +831,32 @@ void Core::Execute_CC(Instruction inst)
m_regs.FLAG.UpdateError();
}
void Core::Execute_CDP(Instruction inst)
{
m_regs.FLAG.Clear();
const u8 shift = inst.GetShift();
const bool lm = inst.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);
// No need to assign these to MAC[1-3], as it'll never overflow.
// [MAC1,MAC2,MAC3] = [R*IR1,G*IR2,B*IR3] SHL 4
const s32 in_MAC1 = (s32(ZeroExtend32(m_regs.RGBC[0])) * s32(m_regs.IR1)) << 4;
const s32 in_MAC2 = (s32(ZeroExtend32(m_regs.RGBC[1])) * s32(m_regs.IR2)) << 4;
const s32 in_MAC3 = (s32(ZeroExtend32(m_regs.RGBC[2])) * s32(m_regs.IR3)) << 4;
// [MAC1,MAC2,MAC3] = MAC+(FC-MAC)*IR0 ;<--- for CDP only
// [MAC1, MAC2, MAC3] = [MAC1, MAC2, MAC3] SAR(sf * 12)
InterpolateColor(in_MAC1, in_MAC2, in_MAC3, shift, lm);
// Color FIFO = [MAC1/16,MAC2/16,MAC3/16,CODE], [IR1,IR2,IR3] = [MAC1,MAC2,MAC3]
PushRGBFromMAC();
m_regs.FLAG.UpdateError();
}
void Core::DPCS(const u8 color[3], u8 shift, bool lm)
{
// In: [IR1,IR2,IR3]=Vector, FC=Far Color, IR0=Interpolation value, CODE=MSB of RGBC

1
src/core/gte.h
View File

@ -90,6 +90,7 @@ private:
void Execute_NCDS(Instruction inst);
void Execute_NCDT(Instruction inst);
void Execute_CC(Instruction inst);
void Execute_CDP(Instruction inst);
void Execute_DPCS(Instruction inst);
void Execute_DPCT(Instruction inst);
void Execute_DCPL(Instruction inst);