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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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10
packages/ludic.render3d/scatter.ludic
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@ -36,7 +36,7 @@ property Layer {
last_cam: floats,
rough: float = 0.0,
blade: bool = false,
grass: bool = false, # ground-cover grass the game may hand to the GPU blades (R3D_NOGRASS skips it)
grass: bool = false, # ground cover the GPU blades replace: skipped while they draw (and under R3D_NOGRASS)
flower: bool = false,
card: bool = false,
cheap: bool = false, # distant cover: no shadows, no wind, flat lighting
@ -1135,7 +1135,7 @@ function scatter_draw_depth(render3d_st: mut Render3dState) -> void {
for i in 0 .. len(render3d_st.sc_layers) {
let l = render3d_st.sc_layers[i]
if not l.foliage or l.blade or l.flower { continue }
if render3d_st.sc_skip_grass and l.grass { continue }
if l.grass and sc_grass_replaced(render3d_st) { continue }
if render3d_st.r3d_no_trees and l.imp != null { continue }
layer_update(render3d_st, l)
if l.n_lods > 1 and l.g_on {
@ -1151,13 +1151,15 @@ function scatter_draw_depth(render3d_st: mut Render3dState) -> void {
}
gpu_cull(render3d_st, true)
}
# a layer the game flagged `grass` is ground cover the GPU blades stand in for: off while they draw
function sc_grass_replaced(render3d_st: Render3dState) -> bool { return render3d_st.sc_skip_grass or ((render3d_st.grass_on or render3d_st.grass_force) and not render3d_st.grass_env_off and render3d_st.grass_prog != 0) }
function scatter_draw(render3d_st: mut Render3dState) -> void {
for i in 0 .. len(render3d_st.sc_layers) {
let l = render3d_st.sc_layers[i]
if render3d_st.sc_skip_blade and l.blade { continue }
if render3d_st.sc_skip_flower and l.flower { continue }
if render3d_st.sc_skip_card and l.card { continue }
if render3d_st.sc_skip_grass and l.grass { continue }
if l.grass and sc_grass_replaced(render3d_st) { continue }
if render3d_st.r3d_no_trees and l.imp != null and not l.card { continue }
layer_update(render3d_st, l)
layer_draw_near(render3d_st, l, false, null, false)
@ -1175,7 +1177,7 @@ function scatter_draw_casters(render3d_st: mut Render3dState, light_vp: floats)
let l = render3d_st.sc_layers[i]
if render3d_st.sc_skip_blade and l.blade { continue }
if render3d_st.sc_skip_card and l.card { continue }
if render3d_st.sc_skip_grass and l.grass { continue }
if l.grass and sc_grass_replaced(render3d_st) { continue }
if render3d_st.r3d_no_trees and l.imp != null and not l.card { continue }
layer_update(render3d_st, l)
if l.imp != null {