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UNROM-512: Fixed mirroring issues (?)

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This commit is contained in:
Sour 2018-03-15 19:51:28 -04:00
parent a68b28c06e
commit ed2cef21c0
1 changed files with 5 additions and 5 deletions
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10
Core/UnRom512.h
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@ -6,7 +6,7 @@
class UnRom512 : public BaseMapper
{
private:
bool _oneScreenMirroring;
bool _enableMirroringBit;
protected:
virtual uint16_t GetPRGPageSize() override { return 0x4000; }
@ -20,16 +20,16 @@ protected:
{
SelectPRGPage(1, -1);
if(IsNes20()) {
_oneScreenMirroring = GetMirroringType() == MirroringType::ScreenAOnly;
_enableMirroringBit = GetMirroringType() == MirroringType::ScreenAOnly;
} else {
_oneScreenMirroring = GetMirroringType() == MirroringType::FourScreens;
_enableMirroringBit = GetMirroringType() == MirroringType::FourScreens;
}
}
void SetDefaultNametables(uint8_t* nametableA, uint8_t* nametableB) override
{
BaseMapper::SetDefaultNametables(nametableA, nametableB);
if(IsNes20() && !_oneScreenMirroring && _chrRam && _chrRamSize >= 0x8000) {
if(GetMirroringType() == MirroringType::FourScreens && _chrRam && _chrRamSize >= 0x8000) {
//InfiniteNesLives four-screen mirroring variation, last 8kb of CHR RAM is always mapped to 0x2000-0x3FFF (0x3EFF due to palette)
//This "breaks" the "UNROM512_4screen_test" test ROM - was the ROM actually tested on this board? Seems to contradict hardware specs
SetPpuMemoryMapping(0x2000, 0x3FFF, _chrRam + 0x6000);
@ -42,7 +42,7 @@ protected:
SelectPRGPage(0, value & 0x1F);
SelectCHRPage(0, (value >> 5) & 0x03);
if(_oneScreenMirroring) {
if(_enableMirroringBit) {
SetMirroringType(value & 0x80 ? MirroringType::ScreenBOnly : MirroringType::ScreenAOnly);
}
} else {