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MONKEY (r19, Brill interior light): strict room-visibility test for the torch shell in static_gx

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Shader part of benilla-everwood 20e19334 (the rest of that commit is non-graphics).

(cherry picked from commit 20e19334, static_gx.wgsl only)
This commit is contained in:
pkuzic
2026-10-09 12:42:52 +01:00
parent cc1dde91e2
commit 78a23dc446
1 changed files with 13 additions and 1 deletions
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crates/benilla-world/src/shaders/static_gx.wgsl
+13 -1
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@@ -446,6 +446,16 @@ fn torch_map_at(light_pos: vec3<f32>, P: vec3<f32>, N: vec3<f32>, fade_radius: f
let fixture = torch_table.positions[i].xyz;
let face = torch_face(P - fixture);
let layer = i * 6u + face;
// MONKEY (room visibility): the shell needs proven visibility; the shared shadow
// helper fails open outside its projection because ordinary shadows fade away there.
if (strict) {
let clip = torch_table.view_projs[layer] * vec4<f32>(P, 1.0);
if (clip.w <= 0.0) { return 0.0; }
let ndc = clip.xyz / clip.w;
if (any(abs(ndc.xy) > vec2<f32>(1.0)) || ndc.z < 0.0 || ndc.z > 1.0) {
return 0.0;
}
}
// MONKEY (live bank rank): count.z is CPU-ready-filtered; holes must not consume
// live cubes. Keep the projection on the static slot while compacting depth only.
let rank = countOneBits(torch_table.count.z & ((1u << i) - 1u));
@@ -460,7 +470,9 @@ fn torch_map_at(light_pos: vec3<f32>, P: vec3<f32>, N: vec3<f32>, fade_radius: f
);
let s = shadow_hook::torch_map_shadow(
torch_table.view_projs[layer], i32(depth_layer), P, N, torch_depth, torch_samp,
TORCH_BIAS, torch_soft(), fade);
// MONKEY (room visibility): a shadow's artistic fade restores blocked light;
// a visibility test must use raw PCF, even far from the hearth behind a wall.
TORCH_BIAS, torch_soft(), select(fade, 1.0, strict));
// MONKEY (torch caster selection): `.w` is the slot's FADE WEIGHT. A slot ramps 0 -> 1
// over ~1/3 s when it is promoted and 1 -> 0 before it is reused, and `mix` turns that
// into the shadow appearing/dissolving instead of switching. Without it the selection