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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 de5eb6562e
commit 78199e9b8c
3 changed files with 90 additions and 42 deletions
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91
godot/Main.cs
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@@ -7,8 +7,9 @@ using Age.Engine.Vm;
public partial class Main : Godot.Control
{
private Control _stage = null!; // texture layer (behind the text)
private readonly Dictionary<int, TextureRect> _slots = new();
private TextureRect _screenView = null!; // shows the composited screen backbuffer
private Image _screen = null!; // 800x600 immediate-mode canvas
private ImageTexture _screenTex = null!;
private Label _text = null!;
private Label _status = null!;
private AudioStreamPlayer _bgm = null!; // looping background music
@@ -18,14 +19,26 @@ public partial class Main : Godot.Control
private volatile bool _done;
private bool _ended;
private bool _selftest;
private string? _shotPath; // --shot <png>: capture a page then quit (dev tool)
private int _shotPage = 1; // --shot-page <n>: which page to capture (default 1)
private volatile int _pageCount;
private int _shotSettle;
private bool _shotDone;
public override void _Ready()
{
// texture stage, added first so it draws BEHIND the dialogue text
_stage = new Control();
_stage.SetAnchorsAndOffsetsPreset(LayoutPreset.FullRect);
_stage.MouseFilter = MouseFilterEnum.Ignore;
AddChild(_stage);
// Screen backbuffer: one 800x600 canvas that draw-texture blits into, shown behind the dialogue.
_screen = Image.CreateEmpty(800, 600, false, Image.Format.Rgba8);
_screenTex = ImageTexture.CreateFromImage(_screen);
_screenView = new TextureRect
{
Texture = _screenTex,
ExpandMode = TextureRect.ExpandModeEnum.IgnoreSize,
StretchMode = TextureRect.StretchModeEnum.Scale,
MouseFilter = MouseFilterEnum.Ignore,
};
_screenView.SetAnchorsAndOffsetsPreset(LayoutPreset.FullRect);
AddChild(_screenView); // added first -> draws behind the text/status labels
_text = new Label { AutowrapMode = TextServer.AutowrapMode.WordSmart };
_text.SetAnchorsAndOffsetsPreset(LayoutPreset.FullRect);
@@ -57,7 +70,13 @@ public partial class Main : Godot.Control
AddChild(_bgm);
AddChild(_voice);
_selftest = System.Array.IndexOf(OS.GetCmdlineUserArgs(), "--selftest") >= 0;
var userArgs = OS.GetCmdlineUserArgs();
_selftest = System.Array.IndexOf(userArgs, "--selftest") >= 0;
for (int i = 0; i < userArgs.Length; i++)
{
if (userArgs[i] == "--shot" && i + 1 < userArgs.Length) _shotPath = userArgs[i + 1];
if (userArgs[i] == "--shot-page" && i + 1 < userArgs.Length) int.TryParse(userArgs[i + 1], out _shotPage);
}
var table = OpcodeTableJson.Load(Paths.OpcodesJson);
var script = Sys4Loader.Load(Paths.Scripts()["SC0000.BIN"], table);
@@ -67,10 +86,26 @@ public partial class Main : Godot.Control
if (_selftest)
_ = Task.Run(async () => { while (!_done) { if (_host.IsWaiting) _host.SignalInput(); await Task.Delay(1); } });
// --shot: auto-advance up to (but not past) the target page, then _Process captures + quits.
if (_shotPath != null)
_ = Task.Run(async () => { while (!_done) { if (_host.IsWaiting && _host.Pages < _shotPage) _host.SignalInput(); await Task.Delay(1); } });
}
public override void _Process(double delta)
{
// --shot: once the target page is composed and parked at wait-for-input, settle a few frames then grab it.
if (_shotPath != null && !_shotDone && (_host.Pages >= _shotPage && _host.IsWaiting || _done))
{
if (++_shotSettle >= 3)
{
_shotDone = true;
var img = GetViewport().GetTexture().GetImage();
img.SavePng(_shotPath);
GD.Print($"SHOT saved page {_pageCount} -> {_shotPath}");
GetTree().Quit(0);
}
return;
}
if (_done && !_ended)
{
_ended = true;
@@ -92,28 +127,24 @@ public partial class Main : Godot.Control
public override void _ExitTree() { _host?.SignalInput(); }
// ---- UI methods invoked on the main thread via CallDeferred ----
// Composite a resolved texture into a slot at (x,y) sized (w,h). One TextureRect per slot,
// layered in draw order (backgrounds are drawn before sprites, so they sit behind).
public void DrawSlot(int slot, string bmpPath, int x, int y, int w, int h)
// Blit a source BMP (src rect) onto the screen backbuffer at (dstX,dstY), then refresh the display
// texture. Execution order == paint order, so later draws (sprites) land over earlier ones (bg).
public void BlitSlot(string bmpPath, int srcX, int srcY, int w, int h, int dstX, int dstY)
{
var img = new Image();
var err = img.LoadBmpFromBuffer(System.IO.File.ReadAllBytes(bmpPath));
if (err != Error.Ok) { GD.Print($"BMP load failed {bmpPath}: {err}"); return; }
if (!_slots.TryGetValue(slot, out var tr))
{
tr = new TextureRect
{
ExpandMode = TextureRect.ExpandModeEnum.IgnoreSize,
StretchMode = TextureRect.StretchModeEnum.Scale,
MouseFilter = MouseFilterEnum.Ignore,
};
_stage.AddChild(tr);
_slots[slot] = tr;
}
tr.Texture = ImageTexture.CreateFromImage(img);
tr.Position = new Vector2(x, y);
tr.Size = new Vector2(w > 0 ? w : img.GetWidth(), h > 0 ? h : img.GetHeight());
tr.Visible = true;
var src = new Image();
if (src.LoadBmpFromBuffer(System.IO.File.ReadAllBytes(bmpPath)) != Error.Ok)
{ GD.Print($"BMP load failed {bmpPath}"); return; }
if (src.GetFormat() != Image.Format.Rgba8) src.Convert(Image.Format.Rgba8);
// Clamp the source rect to the image; a zero/negative size falls back to the full image.
int sw = w > 0 ? w : src.GetWidth();
int sh = h > 0 ? h : src.GetHeight();
sw = System.Math.Min(sw, src.GetWidth() - srcX);
sh = System.Math.Min(sh, src.GetHeight() - srcY);
if (sw <= 0 || sh <= 0) return;
_screen.BlitRect(src, new Rect2I(srcX, srcY, sw, sh), new Vector2I(dstX, dstY));
_screenTex.Update(_screen);
}
// Load an OGG off disk and play it. BGM loops; voice plays once, cutting off any prior line.
@@ -136,7 +167,7 @@ public partial class Main : Godot.Control
}
public void AppendLine(string text) => _text.Text += text + "\n";
public void PageBreak() => _status.Text = "▼ click / Enter";
public void PageBreak() { _pageCount++; _status.Text = "▼ click / Enter"; }
public void ClearPage() { _text.Text = ""; _status.Text = ""; }
public void ShowEnd() => _status.Text = "— end —";