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GBHawk: Fix GBC HDMA behaviour (Wacky Racers)

This commit is contained in:
alyosha-tas 2018-03-28 19:02:02 -04:00
parent 3e50881ab9
commit 75f380428f
1 changed files with 15 additions and 5 deletions
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20
BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/GBC_PPU.cs
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@ -160,15 +160,19 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
// These are GBC specific Regs
case 0xFF51: // HDMA1
HDMA_src_hi = value;
cur_DMA_src = (ushort)(((HDMA_src_hi & 0xFF) << 8) | (cur_DMA_src & 0xF0));
break;
case 0xFF52: // HDMA2
HDMA_src_lo = value;
cur_DMA_src = (ushort)((cur_DMA_src & 0xFF00) | (HDMA_src_lo & 0xF0));
break;
case 0xFF53: // HDMA3
HDMA_dest_hi = value;
cur_DMA_dest = (ushort)(((HDMA_dest_hi & 0x1F) << 8) | (cur_DMA_dest & 0xF0));
break;
case 0xFF54: // HDMA4
HDMA_dest_lo = value;
cur_DMA_dest = (ushort)((cur_DMA_dest & 0xFF00) | (HDMA_dest_lo & 0xF0));
break;
case 0xFF55: // HDMA5
if (!HDMA_active)
@ -180,7 +184,17 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
// HDMA during HBlank only
HDMA_active = true;
HBL_HDMA_count = 0x10;
last_HBL = LY;
// TODO: DOES HDMA start if triggered in mode 0 immediately? (for now assume no)
if ((STAT & 3) == 0)
{
last_HBL = LY;
}
else
{
last_HBL = LY - 1;
}
HBL_test = true;
HBL_HDMA_go = false;
}
@ -191,10 +205,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
Core.HDMA_transfer = true;
}
// latch read locations
cur_DMA_dest = (ushort)(((HDMA_dest_hi & 0x1F) << 8) | (HDMA_dest_lo & 0xF0));
cur_DMA_src = (ushort)(((HDMA_src_hi & 0xFF) << 8) | (HDMA_src_lo & 0xF0));
HDMA_length = ((value & 0x7F) + 1) * 16;
}
else