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feat(a2b): implement 0x208 get-texture-size (geometry keystone)

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Promote 0x208 from stub to a real VM op that writes the loaded texture's
width/height into its two output globals, via new IHost.GetTextureSize. This is
the single native primitive the CG-load subroutine (SC0000 label_12649) needs;
all downstream centering/anchor geometry is already computed in bytecode.

Non-Godot hosts return (0,0) so trace/selftest parity holds (engine 9/9 incl.
TraceDiffTests). Godot host gets a temporary (0,0) stub; real impl in the
compositor task.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
gamer147
2026-07-06 22:48:10 -04:00
parent e96b1a6fef
commit ea0f1ddc7a
10 changed files with 75 additions and 14 deletions
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6
engine/Age.Engine/Vm/VirtualMachine.cs
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@@ -175,6 +175,12 @@ public sealed class VirtualMachine
case "draw-texture": // (handle, slot, srcX, srcY, w, h, dstX, dstY)
_host.DrawTexture((int)Read(a[1]), (int)Read(a[2]), (int)Read(a[3]), (int)Read(a[4]),
(int)Read(a[5]), (int)Read(a[6]), (int)Read(a[7])); return pc + 1;
case "get-texture-size": // 0x208 (slot) (out_w) (out_h)
{
var (gw, gh) = _host.GetTextureSize((int)Read(a[0]));
Write(a[1], gw); Write(a[2], gh);
return pc + 1;
}
case "play-bgm": _host.PlayBgm(Read(a[0])); return pc + 1;
case "play-voice": _host.PlayVoice(Read(a[0])); return pc + 1;
default: