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PPU: Fixed out-of-bounds memory accesses due to vram/cgram pointers not wrapping

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This commit is contained in:
Sour 2019-02-16 08:08:16 -05:00
parent da2d93aaed
commit fa36f36314
1 changed files with 3 additions and 3 deletions
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6
Core/Ppu.cpp
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@ -183,7 +183,7 @@ void Ppu::Write(uint32_t addr, uint8_t value)
//VMDATAL - VRAM Data Write low byte
_vram[_vramAddress << 1] = value;
if(!_vramAddrIncrementOnSecondReg) {
_vramAddress += _vramIncrementValue;
_vramAddress = (_vramIncrementValue + _vramIncrementValue) & 0x7FFF;
}
break;
@ -191,7 +191,7 @@ void Ppu::Write(uint32_t addr, uint8_t value)
//VMDATAH - VRAM Data Write high byte
_vram[(_vramAddress << 1) + 1] = value;
if(_vramAddrIncrementOnSecondReg) {
_vramAddress += _vramIncrementValue;
_vramAddress = (_vramIncrementValue + _vramIncrementValue) & 0x7FFF;
}
break;
@ -203,7 +203,7 @@ void Ppu::Write(uint32_t addr, uint8_t value)
case 0x2122:
//CGRAM Data write (CGDATA)
_cgram[_cgramAddress] = value;
_cgramAddress++;
_cgramAddress = (_cgramAddress + 1) & (Ppu::CgRamSize - 1);
break;
case 0x4200: