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[C64] Move SaveRam implementation to its own partial

This commit is contained in:
saxxonpike 2025-01-01 11:04:22 -06:00 committed by YoshiRulz
parent ce44d7e4f8
commit 6a8a5aa41e
2 changed files with 104 additions and 94 deletions
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103
src/BizHawk.Emulation.Cores/Computers/Commodore64/Serial/Drive1541.SaveRam.cs Normal file
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@ -0,0 +1,103 @@
using System.IO;
using BizHawk.Common;
using BizHawk.Emulation.Common;
namespace BizHawk.Emulation.Cores.Computers.Commodore64.Serial;
public sealed partial class Drive1541 : ISaveRam
{
// ISaveRam implementation
// this is some extra state used to keep savestate size down, as most tracks don't get used
// we keep it here for all disks as we need to remember it when swapping disks around
// _usedDiskTracks.Length also doubles as a way to remember the disk count
private bool[][] _usedDiskTracks;
private byte[,][] _diskDeltas;
private readonly Func<int> _getCurrentDiskNumber;
public void InitSaveRam(int diskCount)
{
_usedDiskTracks = new bool[diskCount][];
_diskDeltas = new byte[diskCount, 84][];
for (var i = 0; i < diskCount; i++)
{
_usedDiskTracks[i] = new bool[84];
}
}
public bool SaveRamModified => true;
public byte[] CloneSaveRam()
{
SaveDeltas(); // update the current deltas
using var ms = new MemoryStream();
using var bw = new BinaryWriter(ms);
bw.Write(_usedDiskTracks.Length);
for (var i = 0; i < _usedDiskTracks.Length; i++)
{
bw.WriteByteBuffer(_usedDiskTracks[i]
.ToUByteBuffer());
for (var j = 0; j < 84; j++)
{
bw.WriteByteBuffer(_diskDeltas[i, j]);
}
}
return ms.ToArray();
}
public void StoreSaveRam(byte[] data)
{
using var ms = new MemoryStream(data, false);
using var br = new BinaryReader(ms);
var ndisks = br.ReadInt32();
if (ndisks != _usedDiskTracks.Length)
{
throw new InvalidOperationException("Disk count mismatch!");
}
ResetDeltas();
for (var i = 0; i < _usedDiskTracks.Length; i++)
{
_usedDiskTracks[i] = br.ReadByteBuffer(returnNull: false)!.ToBoolBuffer();
for (var j = 0; j < 84; j++)
{
_diskDeltas[i, j] = br.ReadByteBuffer(returnNull: true);
}
}
_disk?.AttachTracker(_usedDiskTracks[_getCurrentDiskNumber()]);
LoadDeltas(); // load up new deltas
_usedDiskTracks[_getCurrentDiskNumber()][_trackNumber] = true; // make sure this gets set to true now
}
public void SaveDeltas()
{
_disk?.DeltaUpdate((tracknum, original, current) =>
{
_diskDeltas[_getCurrentDiskNumber(), tracknum] = DeltaSerializer.GetDelta<int>(original, current)
.ToArray();
});
}
public void LoadDeltas()
{
_disk?.DeltaUpdate((tracknum, original, current) =>
{
DeltaSerializer.ApplyDelta<int>(original, current, _diskDeltas[_getCurrentDiskNumber(), tracknum]);
});
}
private void ResetDeltas()
{
_disk?.DeltaUpdate(static (_, original, current) =>
{
original.AsSpan()
.CopyTo(current);
});
}
}

95
src/BizHawk.Emulation.Cores/Computers/Commodore64/Serial/Drive1541.cs
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@ -1,14 +1,11 @@
using System.IO;
using BizHawk.Common;
using BizHawk.Emulation.Common;
using BizHawk.Emulation.Cores.Components.M6502;
using BizHawk.Emulation.Cores.Computers.Commodore64.Media;
using BizHawk.Emulation.Cores.Computers.Commodore64.MOS;
namespace BizHawk.Emulation.Cores.Computers.Commodore64.Serial
{
public sealed partial class Drive1541 : SerialPortDevice, ISaveRam
public sealed partial class Drive1541 : SerialPortDevice
{
private Disk _disk;
private int _bitHistory;
@ -258,95 +255,5 @@ namespace BizHawk.Emulation.Cores.Computers.Commodore64.Serial
_diskBits = 0;
}
// ISaveRam implementation
// this is some extra state used to keep savestate size down, as most tracks don't get used
// we keep it here for all disks as we need to remember it when swapping disks around
// _usedDiskTracks.Length also doubles as a way to remember the disk count
private bool[][] _usedDiskTracks;
private byte[,][] _diskDeltas;
private readonly Func<int> _getCurrentDiskNumber;
public void InitSaveRam(int diskCount)
{
_usedDiskTracks = new bool[diskCount][];
_diskDeltas = new byte[diskCount, 84][];
for (var i = 0; i < diskCount; i++)
{
_usedDiskTracks[i] = new bool[84];
}
}
public bool SaveRamModified => true;
public byte[] CloneSaveRam()
{
SaveDeltas(); // update the current deltas
using var ms = new MemoryStream();
using var bw = new BinaryWriter(ms);
bw.Write(_usedDiskTracks.Length);
for (var i = 0; i < _usedDiskTracks.Length; i++)
{
bw.WriteByteBuffer(_usedDiskTracks[i].ToUByteBuffer());
for (var j = 0; j < 84; j++)
{
bw.WriteByteBuffer(_diskDeltas[i, j]);
}
}
return ms.ToArray();
}
public void StoreSaveRam(byte[] data)
{
using var ms = new MemoryStream(data, false);
using var br = new BinaryReader(ms);
var ndisks = br.ReadInt32();
if (ndisks != _usedDiskTracks.Length)
{
throw new InvalidOperationException("Disk count mismatch!");
}
ResetDeltas();
for (var i = 0; i < _usedDiskTracks.Length; i++)
{
_usedDiskTracks[i] = br.ReadByteBuffer(returnNull: false)!.ToBoolBuffer();
for (var j = 0; j < 84; j++)
{
_diskDeltas[i, j] = br.ReadByteBuffer(returnNull: true);
}
}
_disk?.AttachTracker(_usedDiskTracks[_getCurrentDiskNumber()]);
LoadDeltas(); // load up new deltas
_usedDiskTracks[_getCurrentDiskNumber()][_trackNumber] = true; // make sure this gets set to true now
}
public void SaveDeltas()
{
_disk?.DeltaUpdate((tracknum, original, current) =>
{
_diskDeltas[_getCurrentDiskNumber(), tracknum] = DeltaSerializer.GetDelta<int>(original, current).ToArray();
});
}
public void LoadDeltas()
{
_disk?.DeltaUpdate((tracknum, original, current) =>
{
DeltaSerializer.ApplyDelta<int>(original, current, _diskDeltas[_getCurrentDiskNumber(), tracknum]);
});
}
private void ResetDeltas()
{
_disk?.DeltaUpdate(static (_, original, current) =>
{
original.AsSpan().CopyTo(current);
});
}
}
}