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fix(D.2b): point-sample the dat-font atlas so UI text is pixel-crisp

The font glyph atlas was uploaded with bilinear (Linear) min/mag filtering, which
softens the small dat-font glyphs (the menu/button text "blur"). Add a nearest-filter
path to UploadRgba8/GetOrUploadRenderSurface and use it for the font atlases only
(world + other UI surfaces keep bilinear). Combined with the existing per-glyph
pixel-snap, glyph texels now map 1:1 to screen pixels. Sharpens all dat-font text
(transcript, menu, Send/Chat buttons, vitals numbers).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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This commit is contained in:
Erik 2026-06-16 12:02:07 +02:00
parent 621a4ab468
commit 828bec5fb5
2 changed files with 12 additions and 7 deletions
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6
src/AcDream.App/UI/UiDatFont.cs
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@ -101,11 +101,13 @@ public sealed class UiDatFont
if (font.ForegroundSurfaceDataId == 0)
return null;
uint fgTex = cache.GetOrUploadRenderSurface(font.ForegroundSurfaceDataId, out int fgW, out int fgH);
// Point-sample the glyph atlases (nearest) so small UI text stays pixel-crisp;
// bilinear softens the dat font noticeably (the chat menu/button text "blur").
uint fgTex = cache.GetOrUploadRenderSurface(font.ForegroundSurfaceDataId, out int fgW, out int fgH, nearest: true);
uint bgTex = 0; int bgW = 0, bgH = 0;
if (font.BackgroundSurfaceDataId != 0)
bgTex = cache.GetOrUploadRenderSurface(font.BackgroundSurfaceDataId, out bgW, out bgH);
bgTex = cache.GetOrUploadRenderSurface(font.BackgroundSurfaceDataId, out bgW, out bgH, nearest: true);
// Build the char->descriptor lookup. FontCharDesc.Unicode is the code
// point; for Latin-1 fonts this is a direct char cast. Last write wins