forked from 1b-agent/opencadstudio-upstream
Hakan SevenandClaude Opus 4.8
374cf7e89f
Groundwork to render CAD text as per-glyph SDF quads (box-quad snap, perf, no LOD) instead of stroke-polyline wires. CPU side fully tested; GPU side compiles but is not yet wired into the render loop. - scene::text::sdf_atlas — GlyphAtlas: shelf packer + R8 SDF tiles baked per (font, char). Unified field so one shader draws both kinds: TrueType = signed distance to the filled outline, LFF stroke = pen band. Uses only crates already in the tree (ttf-parser/lyon via the existing Glyph). - scene::text::glyph_quads — layout_glyph_quads: lays a run out as per-glyph quads using the exact tessellate_text_run transform, so quads land where the strokes would. Per-char advance (TTF shaping is a follow-up). - shaders/text.wgsl — SDF fragment shader (smoothstep over fwidth), RTE vertex path mirroring image.wgsl, per-vertex colour + draw-order bias. - scene::pipeline::text_gpu — TextVertex + double-single vertex builder, R8 atlas texture upload, bind group, and the image-cloned pipeline. 13 unit tests across the three CPU stages, all green. Modules carry #![allow(dead_code)] until the render-loop integration lands. Co-Authored-By: Claude Opus 4.8 <[email protected]>