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Complete native numbered-save round trips

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This commit is contained in:
gamer147
2026-07-24 23:25:54 -04:00
parent 4db7e412bd
commit 0a4e200876
17 changed files with 907 additions and 89 deletions
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45
engine/Age.Engine/Persistence/NativeNumberedSaveCodec.cs
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@@ -28,7 +28,8 @@ public sealed record NativeNumberedSaveState(
IReadOnlyList<NativeSavedGfxObject> GfxObjects,
long RangeTransformFirst,
int RangeTransformCount,
byte[] RangeTransformRecord)
byte[] RangeTransformRecord,
bool LegacyTightGfxLayout = false)
{
public const int SoundEffectChannelCount = 10;
public const int ResourceRecordsSize = 300 * 4;
@@ -45,6 +46,9 @@ public static class NativeNumberedSaveCodec
private const int FrameReturnCapacity = 256;
private const int GfxAllocationDwords = 0x2d8;
private const int GfxConstantDwords = 0x2e1;
// AGE stores a byte-sized 0x2d4 object record at the front of a 0x2d4-DWORD region.
// The handle consumes one preceding DWORD, so consecutive entries start 0x2d5 DWORDs apart.
private const int GfxEntryStrideBytes = (1 + NativeNumberedSaveState.GfxRecordSize) * 4;
private static readonly Encoding NativeEncoding = CreateNativeEncoding();
public static byte[] Encode(NativeNumberedSaveState state)
@@ -103,7 +107,7 @@ public static class NativeNumberedSaveCodec
{
WriteInt(payload, at, unchecked((int)gfx.Handle));
gfx.Record.CopyTo(payload, at + 4);
at += 4 + NativeNumberedSaveState.GfxRecordSize;
at += GfxEntryStrideBytes;
}
WriteInt(payload, at, unchecked((int)state.RangeTransformFirst));
WriteInt(payload, at + 4, state.RangeTransformCount);
@@ -154,14 +158,19 @@ public static class NativeNumberedSaveCodec
if (gfxRecordSize != NativeNumberedSaveState.GfxRecordSize)
throw new InvalidDataException($"Unsupported native gfx record size 0x{gfxRecordSize:x}.");
at += 8;
var objects = new NativeSavedGfxObject[gfxCount];
for (int i = 0; i < objects.Length; i++)
int objectsAt = at;
(NativeSavedGfxObject[] objects, int afterObjects) =
ReadGfxObjects(payload, objectsAt, gfxCount, GfxEntryStrideBytes);
bool legacyTightGfxLayout = false;
// Compatibility for experimental files written by the port before the native DWORD stride was
// understood. A native retained-object map cannot contain duplicate handles.
if (objects.Select(item => item.Handle).Distinct().Count() != objects.Length)
{
Require(payload, at, 4 + gfxRecordSize, "numbered-save gfx object");
long handle = ReadInt(payload, at);
objects[i] = new NativeSavedGfxObject(handle, payload.Slice(at + 4, gfxRecordSize).ToArray());
at += 4 + gfxRecordSize;
(objects, afterObjects) =
ReadGfxObjects(payload, objectsAt, gfxCount, 4 + gfxRecordSize);
legacyTightGfxLayout = true;
}
at = afterObjects;
Require(payload, at, 8 + gfxRecordSize, "numbered-save range transform");
long rangeFirst = ReadInt(payload, at);
int rangeCount = ReadInt(payload, at + 4);
@@ -170,7 +179,25 @@ public static class NativeNumberedSaveCodec
return new NativeNumberedSaveState(
ReadInt(payload, 4), ReadInt(payload, 8), soundEffects, resources, surfaces, frames,
integers, floats, strings, pointers, pointerStrings, localPointerScratch, objects,
rangeFirst, rangeCount, rangeRecord);
rangeFirst, rangeCount, rangeRecord, legacyTightGfxLayout);
}
private static (NativeSavedGfxObject[] Objects, int After) ReadGfxObjects(
ReadOnlySpan<byte> payload, int offset, int count, int strideBytes)
{
var objects = new NativeSavedGfxObject[count];
int at = offset;
for (int i = 0; i < objects.Length; i++)
{
Require(payload, at, 4 + NativeNumberedSaveState.GfxRecordSize,
"numbered-save gfx object");
long handle = ReadInt(payload, at);
objects[i] = new NativeSavedGfxObject(
handle,
payload.Slice(at + 4, NativeNumberedSaveState.GfxRecordSize).ToArray());
at = checked(at + strideBytes);
}
return (objects, at);
}
public static NativeNumberedSaveState Empty(IReadOnlyList<NativeSavedScriptFrame> frames)