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feat: resolve per-object alpha/tint/blend into RenderObject (colorkey retained)

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0x202/0x203 now route through GfxState.SetObjectColor (sets HasColor);
SnapshotVisibleObjects resolves Alpha/Tint/BlendKind. Drops the stale
'alpha deferred' trace stub — alpha/tint is now consumed by the compositor.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
gamer147
2026-07-08 19:06:34 -04:00
parent 4ee7a26e3f
commit 143fe8258c
4 changed files with 74 additions and 17 deletions
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19
engine/Age.Engine/Vm/VirtualMachine.cs
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@@ -270,12 +270,10 @@ public sealed class VirtualMachine
Gfx.EraseRange(Read(a[0]), Read(a[1])); return pc + 1;
case "gfx-elem-release": // 0x1fa (handle)
Gfx.Release(Read(a[0])); return pc + 1;
case "gfx-blit-color": // 0x202 (handle)(x)(y)(alpha)(color) — blend deferred
Gfx.GetOrCreate(Read(a[0])).Color = GfxState.PackColor(Read(a[3]), Read(a[4]));
WarnAlphaDeferredOnce(); return pc + 1;
case "gfx-draw-color": // 0x203 (handle)(v)(alpha)(color) — blend deferred
Gfx.GetOrCreate(Read(a[0])).Color = GfxState.PackColor(Read(a[2]), Read(a[3]));
WarnAlphaDeferredOnce(); return pc + 1;
case "gfx-blit-color": // 0x202 (handle)(x)(y)(alpha)(color) — static alpha/tint (anim interp deferred)
Gfx.SetObjectColor(Read(a[0]), GfxState.PackColor(Read(a[3]), Read(a[4]))); return pc + 1;
case "gfx-draw-color": // 0x203 (handle)(v)(alpha)(color) — static alpha/tint
Gfx.SetObjectColor(Read(a[0]), GfxState.PackColor(Read(a[2]), Read(a[3]))); return pc + 1;
// ---- sprite transform / animation cluster (docs/engine-re.md "0x21c-0x243 ... ANIMATION") ----
case "set-anim-transform-abs": // 0x220 (handle)(p1)(p2)(x)(y)(z) — set transform directly
Gfx.SetAnimTransform(Read(a[0]), Read(a[1]), Read(a[2]),
@@ -294,13 +292,4 @@ public sealed class VirtualMachine
}
}
// Colored-draw ops (0x202/0x203) store the packed color on the object now; the actual alpha/additive
// blend in the compositor is deferred. Surface it once (not silently) via the trace sink — observe-only,
// so parity holds. See docs/superpowers/specs/2026-07-07-gfx-command-buffer-design.md (Deferrals).
private bool _warnedAlpha;
private void WarnAlphaDeferredOnce()
{
if (_warnedAlpha) return; _warnedAlpha = true;
_sink.Emit(TraceEvent.Stub(0x202, -1));
}
}