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Simplify rom padding step in `PCEngine.Init`

This commit is contained in:
YoshiRulz 2025-03-21 20:24:12 +10:00
parent aad3c90a5e
commit fef3b526b6
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GPG Key ID: C4DE31C245353FB7
1 changed files with 10 additions and 15 deletions
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25
src/BizHawk.Emulation.Cores/Consoles/PC Engine/PCEngine.cs
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@ -1,6 +1,7 @@
using System.Collections.Generic;
using BizHawk.Common;
using BizHawk.Common.CollectionExtensions;
using BizHawk.Emulation.Common;
using BizHawk.Emulation.Cores.Components;
using BizHawk.Emulation.Cores.Components.H6280;
@ -202,35 +203,29 @@ namespace BizHawk.Emulation.Cores.PCEngine
Cpu.ThinkAction = cycles => { SCSI.Think(); ADPCM.Think(cycles); };
}
if (rom.Length == 0x60000)
{
// 384k roms require special loading code. Why ;_;
// In memory, 384k roms look like [1st 256k][Then full 384k]
RomData = new byte[0xA0000];
var origRom = rom;
for (int i = 0; i < 0x40000; i++)
RomData[i] = origRom[i];
for (int i = 0; i < 0x60000; i++)
RomData[i + 0x40000] = origRom[i];
RomLength = RomData.Length;
}
else if (rom.Length > 1024 * 1024)
if (rom.Length > 1024 * 1024)
{
// If the rom is bigger than 1 megabyte, switch to Street Fighter 2 mapper
Cpu.ReadMemory21 = ReadMemorySF2;
Cpu.WriteMemory21 = WriteMemorySF2;
RomData = rom;
RomLength = RomData.Length;
// user request: current value of the SF2MapperLatch on the tracelogger
Cpu.Logger = s => Tracer.Put(new(disassembly: $"{SF2MapperLatch:X1}:{s.Disassembly}", registerInfo: string.Empty));
}
else if (rom.Length is 0x60000)
{
// 384k roms require special loading code. Why ;_;
// In memory, 384k roms look like [1st 256k][Then full 384k]
RomData = new byte[0xA0000];
((ReadOnlySpan<byte>) rom.AsSpan(start: 0, length: 0x40000)).ConcatArray(rom, dest: RomData);
}
else
{
// normal rom.
RomData = rom;
RomLength = RomData.Length;
}
RomLength = RomData.Length;
if (game["BRAM"] || Type == NecSystemType.TurboCD)
{