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feat: port anim interpolator (ping-pong spritesheet cell + color glow) on nowMs

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BlendMath.PingPong + SnapshotVisibleObjects(nowMs); no-arg overload keeps
headless callers deterministic (parity held, 76/76 + sweep 284/13).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
gamer147
2026-07-08 22:05:00 -04:00
parent 7ca51bfdf3
commit b9ca284f90
3 changed files with 117 additions and 4 deletions
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11
engine/Age.Engine/Model/BlendMath.cs
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@@ -19,4 +19,15 @@ public static class BlendMath
public static (int A, int R, int G, int B) UnpackArgb(long packed)
=> ((int)((packed >> 24) & 0xff), (int)((packed >> 16) & 0xff),
(int)((packed >> 8) & 0xff), (int)(packed & 0xff));
/// <summary>Ping-pong (triangle-wave) progress of gfx_object_anim_interpolate: fold (now-start) mod
/// period at period/2 so the value ramps to the peak at half-period then back. Returns u in
/// [0, period/2]; the interpolation weight toward the target is u / (period/2).</summary>
public static long PingPong(long now, long start, long period)
{
if (period <= 0) return 0;
long u = ((now - start) % period + period) % period;
if (u >= period / 2) u = period - u;
return u;
}
}