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nes-fix bug in scroll reg logic causing mis-scrolls in p'radikus conflict

This commit is contained in:
zeromus 2011-09-24 23:35:25 +00:00
parent b56f1ae062
commit c0f61bc1e8
1 changed files with 16 additions and 7 deletions
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23
BizHawk.Emulation/Consoles/Nintendo/NES/PPU.regs.cs
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@ -184,11 +184,16 @@ namespace BizHawk.Emulation.Consoles.Nintendo
public void increment_vs()
{
fv++;
vt += (fv >> 3);
int fv_overflow = (fv >> 3);
vt += fv_overflow;
vt &= 31; //fixed tecmo super bowl
v += (vt == 30) ? 1 : 0;
if (vt == 30 && fv_overflow==1) //caution here (only do it at the exact instant of overflow) fixes p'radikus conflict
{
v++;
vt = 0;
ppu.nes.LogLine("rolling over vt");
}
fv &= 7;
if (vt == 30) vt = 0;
v &= 1;
}
@ -387,13 +392,17 @@ namespace BizHawk.Emulation.Consoles.Nintendo
{
ppur._ht= value >> 3;
ppur.fh = value & 7;
//nes.LogLine("scroll wrote ht = {0} and fh = {1}", ppur._ht, ppur.fh);
nes.LogLine("scroll wrote ht = {0} and fh = {1}", ppur._ht, ppur.fh);
}
else
{
ppur._vt = value >> 3;
ppur._fv = value & 7;
//nes.LogLine("scroll wrote vt = {0} and fv = {1}", ppur._vt, ppur._fv);
if (ppur._vt == 30)
{
int zz = 9;
}
nes.LogLine("scroll wrote vt = {0} and fv = {1}", ppur._vt, ppur._fv);
}
vtoggle ^= true;
}
@ -409,7 +418,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
ppur._h = (value >> 2) & 1;
ppur._v = (value >> 3) & 1;
ppur._fv = (value >> 4) & 3;
//nes.LogLine("scroll wrote fv = {0}", ppur._fv);
nes.LogLine("addr wrote fv = {0}", ppur._fv);
}
else
{
@ -417,7 +426,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
ppur._vt |= (value >> 5);
ppur._ht = value & 31;
ppur.install_latches();
//nes.LogLine("scroll wrote vt = {0}, ht = {1}", ppur._vt, ppur._ht);
nes.LogLine("addr wrote vt = {0}, ht = {1}", ppur._vt, ppur._ht);
nes.board.AddressPPU(ppur.get_2007access());
}