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feat(a2b): screen-backbuffer blit compositor + real GetTextureSize

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Godot host: source images kept per slot with dims read from the BMP header on
the VM thread (synchronous, so the bytecode's geometry math sees real sizes);
draw-texture blits src rect -> dst into one 800x600 canvas in execution order,
shown by a single TextureRect. Selftest byte-parity preserved.

Slot 0 = primary/screen surface: seed its dims to 800x600 (the boot-time
create-texture the single-scene harness skips) and record create-texture(w,h),
so the first CG's anchor-preserve math stays an identity instead of corrupting
the persistent base globals. Fixes the grey-first-CG opening. Verified: SC0000
pages 1/3 composite the opening event CG at (0,0) with dialogue over it.

Also adds a --shot <png> [--shot-page N] dev capture to Main (page-gated on a
VM-thread counter) for headless visual verification.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
gamer147
2026-07-06 23:02:58 -04:00
parent d1d470920c
commit 4eae9515fd
3 changed files with 90 additions and 42 deletions
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24
godot/GodotAdvHost.cs
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@@ -8,7 +8,10 @@ public sealed class GodotAdvHost : IHost
private readonly Main _main;
private readonly ResourceMap _res;
private readonly string _scene; // e.g. "SC0000" — for section_base
private readonly Dictionary<int, string?> _slotBmp = new(); // slot -> pre-converted BMP path
private readonly Dictionary<int, string?> _slotBmp = new(); // slot -> pre-converted BMP path
// slot -> dims. Slot 0 is the primary/screen surface (800x600), normally created at engine boot which
// the single-scene harness skips; seed it so the first CG's anchor math stays correct (not 0x0).
private readonly Dictionary<int, (int W, int H)> _slotDims = new() { { 0, (800, 600) } };
private readonly SemaphoreSlim _gate = new(0, 1);
public volatile bool IsWaiting;
public readonly List<(int Offset, string Text)> Captured = new();
@@ -24,8 +27,11 @@ public sealed class GodotAdvHost : IHost
_main.CallDeferred("AppendLine", text);
}
public volatile int Pages; // VM-thread page counter (incremented before IsWaiting so shot-gating can't race)
public void WaitForInput()
{
Pages++;
_main.CallDeferred("PageBreak");
IsWaiting = true;
_gate.Wait();
@@ -40,23 +46,27 @@ public sealed class GodotAdvHost : IHost
public void OnStub(int opcode) { }
// ---- texture ops (run on the VM thread; marshal Godot node work to the main thread) ----
public void CreateTexture(int slot, int width, int height) => _slotBmp[slot] = null;
public void CreateTexture(int slot, int width, int height) { _slotBmp[slot] = null; _slotDims[slot] = (width, height); }
public void SetTexture(long resourceId, int slot)
{
var asset = _res.Resolve(_scene, resourceId);
_slotBmp[slot] = asset != null ? ResourceMap.TexturePath(asset) : null;
var bmp = asset != null ? ResourceMap.TexturePath(asset) : null;
_slotBmp[slot] = bmp;
_slotDims[slot] = BmpHeader.ReadDims(bmp); // synchronous: dims from the header, no Godot Image
}
// Dims are read from the BMP header on the VM thread so the bytecode's geometry math (which calls this
// synchronously right after set-texture) sees the real size. Pixels are blitted later on the main thread.
public (int Width, int Height) GetTextureSize(int slot)
=> _slotDims.TryGetValue(slot, out var d) ? (d.W, d.H) : (0, 0);
public void DrawTexture(int slot, int srcX, int srcY, int width, int height, int dstX, int dstY)
{
if (_slotBmp.TryGetValue(slot, out var bmp) && bmp != null)
_main.CallDeferred("DrawSlot", slot, bmp, dstX, dstY, width, height);
_main.CallDeferred("BlitSlot", bmp, srcX, srcY, width, height, dstX, dstY);
}
// Temporary stub — replaced by the real BMP-header-backed impl in Task 3 (blit compositor).
public (int Width, int Height) GetTextureSize(int slot) => (0, 0);
// ---- audio ops (OGG plays natively in Godot) ----
// BGM: addressed by direct name (BGM{id:D3}.OGG), NOT the manifest. Voice: via the per-scene manifest.
public void PlayBgm(long id)