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PPU: Fixed mosaic effect when enabling it mid-frame (i.e after scanline 0)

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Fixes FF6 mosaic effect only working horizontally (all blocks were 1 pixel high) on some screens (e.g rescue sequence)
This commit is contained in:
Sour 2020-01-11 20:52:30 -05:00
parent fac4b3c4e7
commit 523e143ba5
1 changed files with 8 additions and 1 deletions
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9
Core/Ppu.cpp
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@ -1822,7 +1822,14 @@ void Ppu::Write(uint32_t addr, uint8_t value)
case 0x2106: {
//MOSAIC - Screen Pixelation
_state.MosaicSize = ((value & 0xF0) >> 4) + 1;
_state.MosaicEnabled = value & 0x0F;
uint8_t mosaicEnabled = value & 0x0F;
if(!_state.MosaicEnabled && mosaicEnabled) {
//"If this register is set during the frame, the <20>starting scanline is the current scanline, otherwise it is the first visible scanline of the frame."
//This is only done when mosaic is turned on from an off state (FF6 mosaic effect looks wrong otherwise)
//FF6's mosaic effect is broken on some screens without this.
_mosaicScanlineCounter = _state.MosaicSize + 1;
}
_state.MosaicEnabled = mosaicEnabled;
break;
}