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feat(render3d): the meadow's blades are culled on the GPU - under 1.5 ms of a MoltenVK frame for all the grass

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- grass_cull.comp decides each candidate blade once a frame (place, ground, density, water,
  slope, frustum, colour field) and writes survivors into three bands by distance, one indirect
  draw each; grass_inst.vert only bends and places the vertices. OpenGL keeps grass.vert's
  per-vertex path; R3D_GRASS_GPU=0 compares
- compute programs take sampled textures after their buffers (gpu_compute_tex / gpu_dispatch_tex),
  and every dispatch now records a compute-to-draw memory barrier
- the blades as a sward: 4 m cells, bands with five, three and one-quad blades, spacing doubling
  every 18 m to 70 m, never narrower than a pixel; lit facing the sun and leaning to the sky,
  shadow looked up above the ground (it read the terrain as its caster), a colour ramp that
  leaves only the sheath dark, clumps, dry patches and a tussock shade worked out per blade
- scatter layers flagged grass are skipped while the blades draw (and under R3D_NOGRASS);
  R3D_BLADES, R3D_NOBLADES win over the game's setting; R3D_GRASS_S0/D0 for measuring

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-27 15:38:43 +03:00
parent f815f3e3cf
commit cc384efee0
34 changed files with 798 additions and 212 deletions
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5
packages/ludic.render3d/shaders/variants.list
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@ -20,8 +20,8 @@ fullscreen.vert|tonemap.frag|
fullscreen.vert|tonemap.frag|#define HDR10;
fullscreen.vert|volumetric.frag|
grass.mesh|model.frag|#define FOLIAGE;#define BLADE;#define MESH;
grass.vert|model.frag|#define FOLIAGE;#define BLADE;
grass.vert|model.frag|#define FOLIAGE;#define BLADE;#define TILES;
grass.vert|model.frag|#define FOLIAGE;#define BLADE;#define GBLADE;
grass.vert|model.frag|#define FOLIAGE;#define BLADE;#define GBLADE;#define TILES;
impostor.vert|impostor.frag|
impostor.vert|impostor.frag|#define SHADOW_PASS;
model.vert|bake.frag|
@ -59,3 +59,4 @@ terrain.vert|terrain.frag|#define SUN_INLINE;#define FAR_ONLY;
terrain.vert|terrain.frag|#define SUN_INLINE;#define NEAR_ONLY;
terrain.vert|tersun.frag|
water.vert|water.frag|
grass_inst.vert|model.frag|#define FOLIAGE;#define BLADE;#define GBLADE;#define GINST;