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GBHawk: Halt DMA when CPU is halted

This commit is contained in:
alyosha-tas 2017-12-06 10:50:43 -05:00
parent 80e1ef7ad5
commit fe25f35b86
1 changed files with 9 additions and 6 deletions
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15
BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawk/PPU.cs
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@ -188,8 +188,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
public void tick()
{
// tick DMA
if (DMA_start)
// tick DMA, note that DMA is halted when the CPU is halted
if (DMA_start && !Core.cpu.halted)
{
if (DMA_clock >= 4)
{
@ -221,6 +221,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
if (DMA_clock == 648)
{
DMA_start = false;
DMA_OAM_access = true;
}
}
@ -534,14 +535,15 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
{
if (OAM_scan_index < 40)
{
ushort temp = DMA_OAM_access ? Core.OAM[OAM_scan_index * 4] : (ushort)0xFF;
// (sprite Y - 16) equals LY, we have a sprite
if ((Core.OAM[OAM_scan_index * 4] - 16) <= LY &&
((Core.OAM[OAM_scan_index * 4] - 16) + 8 + (LCDC.Bit(2) ? 8 : 0)) > LY)
if ((temp - 16) <= LY &&
((temp - 16) + 8 + (LCDC.Bit(2) ? 8 : 0)) > LY)
{
// always pick the first 10 in range sprites
if (SL_sprites_index < 10)
{
SL_sprites[SL_sprites_index * 4] = Core.OAM[OAM_scan_index * 4];
SL_sprites[SL_sprites_index * 4] = temp;
write_sprite = 1;
}
@ -559,7 +561,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawk
}
else
{
SL_sprites[SL_sprites_index * 4 + write_sprite] = Core.OAM[OAM_scan_index * 4 + write_sprite];
ushort temp2 = DMA_OAM_access ? Core.OAM[OAM_scan_index * 4 + write_sprite] : (ushort)0xFF;
SL_sprites[SL_sprites_index * 4 + write_sprite] = temp2;
write_sprite++;
if (write_sprite == 4)