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PPU: Offset-per-tile mode fixes

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This commit is contained in:
Sour 2019-03-03 18:05:58 -05:00
parent 706ef2f6e4
commit 03d6be7ac7
1 changed files with 3 additions and 3 deletions
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6
Core/Ppu.cpp
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@ -551,7 +551,7 @@ void Ppu::RenderTilemap()
uint16_t hScroll = hiResMode ? (config.HScroll << 1) : config.HScroll;
//"Offset per tile" mode (modes 2, 4 and 6 support this)
bool offsetPerTileMode = (_bgMode & 0x03) == 2;
bool offsetPerTileMode = _bgMode == 2 || _bgMode == 4 || _bgMode == 6;
/* The current pixel x position (normally 0-255, but 0-511 in hi-res mode - even on subscreen, odd on main screen) */
uint16_t realX;
@ -678,7 +678,7 @@ void Ppu::ProcessOffsetMode(uint8_t x, uint16_t realX, uint16_t realY, uint16_t
int16_t offsetValue = _vram[hOffsetAddr] | (_vram[hOffsetAddr + 1] << 8);
if((offsetValue & 0x8000) == 0 && (offsetValue & enableBit)) {
hScroll = (hScroll & 0x07) | ((x & ~0x07) + (offsetValue & 0x3F8));
hScroll = (hScroll & 0x07) | (offsetValue & 0x3F8);
}
if((offsetValue & 0x8000) != 0 && (offsetValue & enableBit)) {
vScroll = (offsetValue & 0x3FF);
@ -690,7 +690,7 @@ void Ppu::ProcessOffsetMode(uint8_t x, uint16_t realX, uint16_t realY, uint16_t
int16_t vOffsetValue = _vram[vOffsetAddr] | (_vram[vOffsetAddr + 1] << 8);
if(hOffsetValue & enableBit) {
hScroll = (hScroll & 0x07) | ((x & ~0x07) + (hOffsetValue & 0x3F8));
hScroll = (hScroll & 0x07) | (hOffsetValue & 0x3F8);
}
if(vOffsetValue & enableBit) {
vScroll = (vOffsetValue & 0x3FF);