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render3d: r3d_fog_wall(dist) - fog that closes to the sky's horizon colour from 0.3 dist to dist, and nothing drawn past dist + 8 m

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Every lit program blends toward the horizon colour (the prefiltered sky with the sun's inscatter,
so it carries the day's grade); the sky's horizon band is pulled to the same colour, wider the
closer the wall. The far plane, scatter and stream cull reach and the shadow cascades are clamped
to the wall; the reflection pass shares the shaders and the cull. 0 is off: every branch is gated
on u_fog_wall > 0 and r3d_reach hands back the far it was given. R3D_FOG_WALL=<m> for a shot.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-29 15:07:40 +03:00
parent 160ce96e4f
commit b9f9cb8495
67 changed files with 335 additions and 227 deletions
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23
packages/ludic.render3d/render.ludic
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@ -36,6 +36,7 @@ function fog_bind(render3d_st: mut Render3dState, prog: int) -> void {
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_fog_base"), render3d_st.r3d_fog_base)
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_fog_inscatter"), render3d_st.r3d_fog_inscatter)
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_fog_desat"), render3d_st.r3d_fog_desat)
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_fog_wall"), render3d_st.r3d_fog_wall)
u_f3(render3d_st, gpu_uniform(render3d_st, prog, "u_ground_alb"), render3d_st.r3d_ground_alb_r, render3d_st.r3d_ground_alb_g, render3d_st.r3d_ground_alb_b)
u_f3(render3d_st, gpu_uniform(render3d_st, prog, "u_ground_alb_hi"), render3d_st.r3d_ground_hi_r, render3d_st.r3d_ground_hi_g, render3d_st.r3d_ground_hi_b)
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_ground_hi_y"), render3d_st.r3d_ground_hi_y)
@ -46,11 +47,31 @@ function fog_bind(render3d_st: mut Render3dState, prog: int) -> void {
u_f(render3d_st, gpu_uniform(render3d_st, prog, "u_time"), render3d_st.r3d_time)
}
# The fog wall (a game's fog setting): dist > 0 hides everything past dist in the sky's colour - from
# three tenths of it to all of it - and draws nothing past it in any pass: the far plane, every scatter
# layer's reach, the shadow cascades. dist <= 0 leaves everything as it was.
const R3D_FOG_MARGIN: float = 8.0
export function r3d_fog_wall(render3d_st: mut Render3dState, dist: float) -> void {
var d = dist
if d < 0.0 { d = 0.0 }
render3d_st.r3d_fog_wall = d
cam_update(render3d_st)
}
# how far anything is drawn: the fog wall and a margin, or `far` (0: no limit of its own) without one
function r3d_reach(render3d_st: Render3dState, far: float) -> float {
if render3d_st.r3d_fog_wall <= 0.0 { return far }
let w = render3d_st.r3d_fog_wall + R3D_FOG_MARGIN
if far <= 0.0 or far > w { return w }
return far
}
# profiling switches (environment): R3D_NOSHADOW R3D_NOGI R3D_MSAA=n R3D_NOBLADES R3D_NOCARDS R3D_NOTREES R3D_NEAR=m
function r3d_env_flags(render3d_st: mut Render3dState) -> void {
render3d_st.r3d_no_shadow = r3d_env_has(render3d_st, "R3D_NOSHADOW")
render3d_st.r3d_no_trees = r3d_env_has(render3d_st, "R3D_NOTREES")
render3d_st.r3d_no_refl = r3d_env_has(render3d_st, "R3D_NOREFL")
# R3D_FOG_WALL=<m>: the fog wall at that distance, for a shot (a game sets it with r3d_fog_wall)
if r3d_env_has(render3d_st, "R3D_FOG_WALL") { render3d_st.r3d_fog_wall = float(Text.to_int(r3d_env(render3d_st, "R3D_FOG_WALL"))) }
if r3d_env_has(render3d_st, "R3D_DEBUG") { render3d_st.r3d_debug = true }
if r3d_env_has(render3d_st, "R3D_DBGSHADOW") { render3d_st.r3d_debug_shadow = true }
if r3d_env_has(render3d_st, "R3D_NOGI") { render3d_st.post_gi_strength = 0.0; render3d_st.post_ao_strength = 0.0; render3d_st.post_no_gi = true }
@ -152,6 +173,8 @@ function r3d_draw_sky(render3d_st: mut Render3dState) -> void {
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_sky_gain"), 0.95)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_sky_relight"), render3d_st.r3d_sky_relight)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_sky_sat"), 1.35)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_fog_wall"), render3d_st.r3d_fog_wall)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_fog_inscatter"), render3d_st.r3d_fog_inscatter)
u_f(render3d_st, gpu_uniform(render3d_st, p, "u_time"), render3d_st.r3d_time)
mesh_draw(render3d_st, render3d_st.sky_fullscreen)
gpu_depth_write(render3d_st, true)