forked from 1b-agent/opencadstudio-upstream
Hakan SevenandClaude Opus 4.7
398eee551d
Adds a dedicated `visibility: array<u32>` storage buffer (binding 4) alongside the existing batched hatch buffers. Vertex shader reads `visibility[v.instance_index]` — 0 → emit an out-of-NDC clip position so the GPU rasterizer clips the primitive before the fragment stage runs. `compute_hatch_lod` now drives this buffer instead of (or alongside, for the per-hatch fallback) `hatch_skip_flags`. Walks a per-instance CPU AABB mirror that the builder fills at upload time (`instance_aabbs`), applies the same `aabb_below_pixel` (sub-pixel LOD) OR `aabb_offscreen` (frustum cull) rule the legacy path used, and pushes the resulting 0/1 flags via `queue.write_buffer` on a separate 4 B-per-hatch buffer — ~40 KB per pan tick for 10 k hatches, far cheaper than re-writing the 112 B-per-instance data. Step 5 will remove the legacy `gpu_hatches` Vec, the per-hatch draw loop, and `hatch_skip_flags` once the batched path has soaked. Co-Authored-By: Claude Opus 4.7 <[email protected]>