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render3d: a grass kind - the GPU blades' per-kind numbers are a GrassKind record the game hands over (grass_kind_set), not constants

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GrassKind (grass_kind.ludic) carries what grass.ludic, grass_gpu.ludic, grass.vert, grass_cull.comp and
model.frag's BLADE path held as constants: the cell, s0 / d0 / radius, the row bands and rows, the blade
profile (neck, root, swell, tip, bend), the heights, clumps, widths and arch, where it grows (slope, snow,
the photograph's test), the root / tip / gone-to-seed colours, the far tufts, the root occlusion, the
roughness, the sheen and the wind. Its defaults are those constants exactly, so a game that sets nothing
draws as before. The shaders read them as u_gk_* (the cull as five more Params vec4s, 288 bytes);
grass_reset.comp writes each band's index count so a kind of other rows reaches the draw in order.
grass_quality holds the kind to a settings tier (never denser, never farther); R3D_GRASS_* still win.
grass_profile_w / _bend are the one profile, for the meshes and a game's preview. grass.mesh takes only
the cell: the rest of it is an older copy that already differs from grass.vert, left as it draws.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-29 19:03:33 +03:00
parent d9a73d63bd
commit e908672034
25 changed files with 335 additions and 75 deletions
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8
packages/ludic.render3d/shaders/grass_reset.comp
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@ -1,8 +1,10 @@
// grass_reset.comp - zero each band's instance count before grass_cull.comp counts into it. On the
// GPU, in order, because the frame before may still be drawing from the same records.
// GPU, in order, because the frame before may still be drawing from the same records. Each band's
// index count is written here too, from the blade the CPU draws it with, so a grass kind of other
// rows (grass_kind_set) reaches the draw in the frame's own order.
layout(local_size_x = 1) in;
layout(set = 0, binding = 0) uniform Params { uvec4 n; } pr;
layout(set = 0, binding = 0) uniform Params { uvec4 n; uvec4 idx; } pr;
layout(set = 0, binding = 1) buffer Cmds { uint cmds[]; };
void main() {
for (uint b = 0u; b < pr.n.x; b++) { cmds[b * 5u + 1u] = 0u; }
for (uint b = 0u; b < pr.n.x; b++) { cmds[b * 5u] = pr.idx[b]; cmds[b * 5u + 1u] = 0u; }
}