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render3d: the fog wall culls on the CPU - nothing past it costs a draw, a vertex or a caster

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cam_sphere_visible refuses a sphere wholly past the wall (terrain patches, scatter cells, stream
chunks, grass tiles, water), actors past it are skipped for draws, casters and outlines, the grass
reach and the streams' generate-and-gather reach end at it, and the card shadows cast only from
the wall's share of a layer (fog_casters.ludic, rebuilt every 4 m). r3d_beyond_fog is exported for
the game to skip animating what will not be drawn. Render-only: no query of the ground or the world
changes, and off is the old frame (0 pixels over 8 against 160ce96, twice per side).

Draws per frame at the overlook: 2757 off, 1104 at 175 m, 484 at 30 m.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-29 15:38:00 +03:00
parent b9f9cb8495
commit 2ce2d997be
9 changed files with 88 additions and 11 deletions
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15
packages/ludic.render3d/grass.ludic
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@ -127,6 +127,13 @@ function grass_init(render3d_st: mut Render3dState) -> void {
}
# indices per 16 m cell that could exist at distance d (the count the shader computes)
# no blades past the fog wall: they would be drawn only to be fogged away
function grass_reach(render3d_st: Render3dState) -> float {
let w = render3d_st.r3d_fog_wall
if w > 0.0 and w < render3d_st.grass_radius { return w }
return render3d_st.grass_radius
}
function grass_count_at(render3d_st: Render3dState, d: float) -> int {
let spacing = render3d_st.grass_s0 * (1.0 + d / render3d_st.grass_d0)
let n = float(GRASS_CELL * GRASS_CELL) / (spacing * spacing)
@ -137,7 +144,7 @@ function grass_count_at(render3d_st: Render3dState, d: float) -> int {
function grass_tiles(render3d_st: mut Render3dState, size: int, d_min: float, d_max: float, blade: Mesh) -> void {
let p = render3d_st.grass_prog
let cells = size / GRASS_CELL
if d_min >= render3d_st.grass_radius { return }
if d_min >= grass_reach(render3d_st) { return }
if render3d_st.grass_merge {
render3d_st.grass_band_start[render3d_st.grass_band_n] = render3d_st.grass_n; render3d_st.grass_band_cells[render3d_st.grass_band_n] = cells
render3d_st.grass_band_mesh[render3d_st.grass_band_n] = blade; render3d_st.grass_band_n += 1
@ -228,11 +235,11 @@ function grass_bind(render3d_st: mut Render3dState, p: int) -> void {
u_v3(render3d_st, gpu_uniform(render3d_st, p, "u_tint"), render3d_st.sc_blade_tint)
u_v3(render3d_st, gpu_uniform(render3d_st, p, "u_blade_base"), render3d_st.sc_blade_base)
u_v3(render3d_st, gpu_uniform(render3d_st, p, "u_blade_tip"), render3d_st.sc_blade_tip)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_cull"), render3d_st.grass_radius)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_cull"), grass_reach(render3d_st))
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_model_h"), 0.0)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_s0"), render3d_st.grass_s0)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_d0"), render3d_st.grass_d0)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_radius"), render3d_st.grass_radius)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_radius"), grass_reach(render3d_st))
var ph = render3d_st.post_h
if ph <= 0 { ph = gl_height() }
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_px"), 2.0 * Math.tan(render3d_st.cam_fov * 0.5) / float(ph))
@ -268,7 +275,7 @@ function grass_bands(render3d_st: mut Render3dState) -> void {
grass_tiles(render3d_st, 4, 0.0, 6.0, render3d_st.grass_mesh)
grass_tiles(render3d_st, 4, 6.0, 16.0, render3d_st.grass_mesh3)
grass_tiles(render3d_st, 8, 16.0, 40.0, render3d_st.grass_mesh2)
grass_tiles(render3d_st, 16, 40.0, render3d_st.grass_radius, render3d_st.grass_mesh2)
grass_tiles(render3d_st, 16, 40.0, grass_reach(render3d_st), render3d_st.grass_mesh2)
}
# the records gathered this frame: uploaded once, then each band GRASS_CHUNK records a draw