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Code Issues 150 Wiki Activity

Fit the cascades of the sun shadows to the depth of the view

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Hirek
2026-10-19 12:02:01 +02:00
parent e7c65993d8
commit 8c00b0bc3d
13 changed files with 857 additions and 21 deletions
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15
shaders/light_common.glsl
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@@ -128,6 +128,21 @@ float calc_shadow_map()
for (cascade = 0U; cascade < MAX_CASCADES; cascade++)
if (distance <= cascade_end[cascade])
break;
// cascades fitted to the depth of the view of an earlier frame (gfx.shadow.sdsm) cover only the area of the points seen
// then: a point at the edge of the view or one which came closer since may be outside the map of its cascade. it goes to
// the first further cascade whose map holds it with the reach of the filter, and is lit past the last one
if (shadow_fit.x > 0.0)
{
float border = 4.0 / float(textureSize(shadowmap, 0).x);
for (; cascade < MAX_CASCADES; cascade++)
{
vec2 fitcoords = (lightview[cascade] * vec4(f_pos.xyz, 1.0)).xy;
if (all(greaterThanEqual(fitcoords, vec2(border))) && all(lessThanEqual(fitcoords, vec2(1.0 - border))))
break;
}
if (cascade >= MAX_CASCADES)
return 0.0;
}
// Normal offset: sample the shadow map from a point pushed along the surface normal
// by a fraction of the cascade's texel footprint. A constant depth bias can't keep up
// with large texels (far cascades, small shadow maps) on surfaces at a grazing angle