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>
15 lines
639 B
TOML
15 lines
639 B
TOML
[package]
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name = "makepad-game-gen"
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version = "0.1.0"
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edition = "2021"
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description = "Procedural geometry and texture generation for Makepad Arcade (see game.md)"
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license = "MIT OR Apache-2.0"
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[dependencies]
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# Deterministic transcendentals: two devices must generate byte-identical
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# meshes from the same seed, which is what lets a forest replicate as
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# (preset, seed, position) instead of vertex data.
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makepad-game-math = { path = "../math" }
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makepad-math = { path = "../../math", version = "1.0.0" }
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# For the f16/unorm8 packers only — one packing implementation, not two.
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makepad-draw = { path = "../../../draw", version = "2.0.0" }
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