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nes: rewrite mapper 76 (sorry, but something wasn't working right, and the file had a rather high ratio of OOP complexity to actual mapper complexity)

This commit is contained in:
goyuken 2014-01-17 22:21:33 +00:00
parent c8459c1296
commit 9e6d364b18
1 changed files with 43 additions and 14 deletions
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Namcot1xx
Mapper076.cs

57
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Namcot1xx/Mapper076.cs
View File

@ -1,8 +1,16 @@
namespace BizHawk.Emulation.Cores.Nintendo.NES
{
//aka NAMCOT-3446
public sealed class Mapper076 : Namcot108Board_Base
public sealed class Mapper076 : NES.NESBoardBase
{
// config
int chr_bank_mask_2k;
int prg_bank_mask_8k;
// state
int[] prg = new int[4];
int[] chr = new int[4];
int port;
public override bool Configure(NES.EDetectionOrigin origin)
{
//analyze board type
@ -15,29 +23,50 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
return false;
}
BaseSetup();
SetMirrorType(EMirrorType.Vertical);
chr_bank_mask_2k = Cart.chr_size / 2 - 1;
prg_bank_mask_8k = Cart.prg_size / 8 - 1;
prg[3] = prg_bank_mask_8k;
prg[2] = prg_bank_mask_8k - 1;
Cart.wram_size = 0;
return true;
}
int RewireCHR(int addr)
public override void WritePRG(int addr, byte value)
{
int mapper_addr = addr >> 1;
int bank_1k = mapper.Get_CHRBank_1K(mapper_addr + 0x1000);
int ofs = addr & ((1 << 11) - 1);
return (bank_1k << 11) + ofs;
switch (addr & 1)
{
case 0:
port = value & 7;
break;
case 1:
switch (port)
{
case 6: prg[0] = value & 63 & prg_bank_mask_8k; break;
case 7: prg[1] = value & 63 & prg_bank_mask_8k; break;
case 2: chr[0] = value & 63 & chr_bank_mask_2k; break;
case 3: chr[1] = value & 63 & chr_bank_mask_2k; break;
case 4: chr[2] = value & 63 & chr_bank_mask_2k; break;
case 5: chr[3] = value & 63 & chr_bank_mask_2k; break;
}
break;
}
}
public override byte ReadPRG(int addr)
{
return ROM[addr & 0x1fff | prg[addr >> 13] << 13];
}
public override byte ReadPPU(int addr)
{
if (addr < 0x2000) return VROM[RewireCHR(addr)];
else return base.ReadPPU(addr);
}
public override void WritePPU(int addr, byte value)
{
if (addr < 0x2000) { }
else base.WritePPU(addr, value);
if (addr < 0x2000)
return VROM[addr & 0x7ff | chr[addr >> 11] << 11];
else
return base.ReadPPU(addr);
}
}
}