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Sunsoft4 (Mapper 68): Added support for selecting CHR ROM as nametables ($C000 and $D000)

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This commit is contained in:
Souryo 2016-07-16 19:16:03 -04:00
parent dba19e1702
commit 94d15b90f6
2 changed files with 47 additions and 4 deletions
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2
Core/MapperFactory.cpp
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@ -170,7 +170,7 @@ BaseMapper* MapperFactory::GetMapperFromID(RomData &romData)
case 65: return new IremH3001();
case 66: return new GxRom();
case 67: return new Sunsoft3();
case 68: return new Sunsoft4(); //incomplete support
case 68: return new Sunsoft4();
case 69: return new SunsoftFme7();
case 70: return new Bandai74161_7432(false);
case 71: return new BF909x();

49
Core/Sunsoft4.h
View File

@ -5,15 +5,54 @@
class Sunsoft4 : public BaseMapper
{
private:
uint8_t _ntRegs[2];
bool _useChrForNametables;
void UpdateNametables()
{
AddNametable(4, _chrRom + _ntRegs[0] * 0x400);
AddNametable(5, _chrRom + _ntRegs[1] * 0x400);
if(_useChrForNametables) {
switch(GetMirroringType()) {
case MirroringType::Vertical: SetNametables(4, 5, 4, 5); break;
case MirroringType::Horizontal: SetNametables(4, 4, 5, 5); break;
case MirroringType::ScreenAOnly: SetNametables(4, 4, 4, 4); break;
case MirroringType::ScreenBOnly: SetNametables(5, 5, 5, 5); break;
}
} else {
//Reset to default mirroring
SetMirroringType(GetMirroringType());
}
}
protected:
virtual uint16_t GetPRGPageSize() { return 0x4000; }
virtual uint16_t GetCHRPageSize() { return 0x800; }
void InitMapper()
{
_useChrForNametables = false;
_ntRegs[0] = _ntRegs[1] = 0;
//Bank 0's initial state is undefined, but some roms expect it to be the first page
SelectPRGPage(0, 0);
SelectPRGPage(1, -1);
}
void StreamState(bool saving)
{
BaseMapper::StreamState(saving);
Stream(_ntRegs[0], _ntRegs[1], _useChrForNametables);
if(!saving) {
UpdateNametables();
}
}
void WriteRegister(uint16_t addr, uint8_t value)
{
switch(addr & 0xF000) {
@ -21,11 +60,13 @@ protected:
case 0x9000: SelectCHRPage(1, value); break;
case 0xA000: SelectCHRPage(2, value); break;
case 0xB000: SelectCHRPage(3, value); break;
case 0xC000:
//TODO
case 0xC000:
_ntRegs[0] = value | 0x80;
UpdateNametables();
break;
case 0xD000:
//TODO
_ntRegs[1] = value | 0x80;
UpdateNametables();
break;
case 0xE000:
switch(value & 0x03) {
@ -34,6 +75,8 @@ protected:
case 2: SetMirroringType(MirroringType::ScreenAOnly); break;
case 3: SetMirroringType(MirroringType::ScreenBOnly); break;
}
_useChrForNametables = (value & 0x10) == 0x10;
UpdateNametables();
break;
case 0xF000:
SelectPRGPage(0, value & 0x0F);