1c418480fe
Seed-deterministic, baked at spawn, emitted straight into the 24-byte packed vertex format. Two devices given the same seed produce byte-identical geometry — which is what lets a forest replicate as (preset, seed, position) tuples instead of mesh data. - L-system plants: expansion + 3D turtle + skeleton, 8 species (oak, pine, palm, bush, fern, cactus, dead, grass) - Surface nets (not marching cubes — fewer, better-shaped triangles at low-poly) for rocks, boulders, mushrooms, clouds, blobs - Spline tracks with width, banking, curbs and rails, returning centreline frames that carry lap distance — so spawn points and checkpoints derive from the track instead of a second hand-written list - Poisson-disk scatter with flatness/height rules - Texture generator with CPU mip chains (backends never generate them) - LRU cache keyed by FNV-1a over the full recipe with floats hashed by exact bits; -0.0 and 0.0 normalise together (identical geometry), 4.0 and 4.000001 stay distinct. Meshes hand out as Rc so eviction cannot pull geometry out from under a frame mid-draw - DrawGameFoliage: growth and wind as an OPT-IN shader variant, a sibling of DrawGameSkinned rather than a flag inside the shared shaders — wind costs ~20 vertex ALU and the cube shader draws most of the world. Growth and flex weights share one packed nibble pair, so both animations cost zero extra vertex bytes A realistic forest — 150x150 m, 582 trees, 3 species, 6 seeds — generates in 1.70 ms with 470 KB resident: 6 generations and 576 cache hits. Three bugs the unit tests had passed, found by writing an ASCII silhouette probe because captures were out of scope: every species came out ~4x its requested height (the test compared two sizes RELATIVELY, so a uniform overshoot sailed through — now the finished skeleton is measured and rescaled, and the test asserts absolute height for all 8 species at three sizes); palm emitted no foliage at all because its L-system contained no leaf symbol; and cactus sprawled sideways like a shrub. Pine also dropped from 4 iterations to 3 — 15032 -> 2504 triangles, 728 -> 68 us — because 15k triangles for one background tree is indefensible. Honest caveat: that is a silhouette judgement, not a rendered one. Shading, leaf-card orientation and the wind/growth animation are visually unverified. Script verbs are not wired yet — the crate is a library only. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
16 lines
765 B
Rust
16 lines
765 B
Rust
use makepad_game_gen::*;
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fn main(){
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for (name,h) in [("oak",4.0f32),("pine",5.0),("palm",6.0),("cactus",3.0)]{
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let m = tree(name, TreeParams{seed:2,height:h,..Default::default()});
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let (w,hh)=(37usize,17usize);
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let mut grid=vec![b' ';w*hh];
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let sx=m.max.x-m.min.x; let sy=m.max.y-m.min.y;
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for v in m.vertices.chunks_exact(6){
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let x=((v[0]-m.min.x)/sx.max(1e-6)*(w-1) as f32) as usize;
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let y=((v[1]-m.min.y)/sy.max(1e-6)*(hh-1) as f32) as usize;
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grid[(hh-1-y.min(hh-1))*w+x.min(w-1)]=b'#';
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}
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println!("--- {name} h={h} ({} tris, {:.1}x{:.1}) ---",m.triangle_count(),sx,sy);
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for r in 0..hh{ println!("{}", String::from_utf8_lossy(&grid[r*w..(r+1)*w])); }
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}
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}
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