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3D: keep the rasterizer from accidentally going out of bounds when given very flat X-major edge slopes.

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this, by a fucking shitshow of butterfly effect, ends up fixing #234. technically, the rasterizer was going out of bounds, which, under certain circumstances, caused interpolation to shit itself and generate Z values that were out of range (but still ended up in the zbuffer). sometimes those values ended up negative, which caused these glitches when polygons had to be drawn over those.

about fucking time.
This commit is contained in:
StapleButter
2018-11-04 23:21:58 +01:00
parent fb284f33ad
commit b4165cc0a9
7 changed files with 165 additions and 14 deletions
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31
src/ARM.cpp
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@ -157,6 +157,8 @@ void ARM::Reset()
ExceptionBase = Num ? 0x00000000 : 0xFFFF0000;
CodeMem.Mem = NULL;
// zorp
JumpTo(ExceptionBase);
}
@ -180,6 +182,24 @@ void ARM::DoSavestate(Savestate* file)
file->VarArray(NextInstr, 2*sizeof(u32));
file->Var32(&ExceptionBase);
if (!file->Saving)
SetupCodeMem(R[15]); // should fix it
}
void ARM::SetupCodeMem(u32 addr)
{
if (!Num)
{
if (CP15::GetCodeMemRegion(addr, &CodeMem))
return;
NDS::ARM9GetMemRegion(addr, false, &CodeMem);
}
else
{
NDS::ARM7GetMemRegion(addr, false, &CodeMem);
}
}
void ARM::JumpTo(u32 addr, bool restorecpsr)
@ -196,20 +216,31 @@ void ARM::JumpTo(u32 addr, bool restorecpsr)
//if (addr == 0x0201764C) printf("capture test %d: R1=%08X\n", R[6], R[1]);
//if (addr == 0x020175D8) printf("capture test %d: res=%08X\n", R[6], R[0]);
u32 oldregion = R[15] >> 23;
u32 newregion = addr >> 23;
//if(!Num)printf("ARM%c branch from %08X to %08X. %03X->%03X\n", Num?'7':'9', R[15], addr, oldregion, newregion);
if (addr & 0x1)
{
addr &= ~0x1;
R[15] = addr+2;
if (newregion != oldregion) SetupCodeMem(addr);
NextInstr[0] = CodeRead16(addr);
NextInstr[1] = CodeRead16(addr+2);
CPSR |= 0x20;
}
else
{
addr &= ~0x3;
R[15] = addr+4;
if (newregion != oldregion) SetupCodeMem(addr);
NextInstr[0] = CodeRead32(addr);
NextInstr[1] = CodeRead32(addr+4);
CPSR &= ~0x20;
}
}