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Code Issues 150 Wiki Activity

light_common: add normal offset to shadow lookups

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Hirek
2026-09-19 21:56:02 +02:00
parent cb6b97b904
commit 1d9c608396
1 changed files with 14 additions and 1 deletions
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15
shaders/light_common.glsl
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@@ -45,7 +45,20 @@ float calc_shadow()
if (distance <= cascade_end[cascade])
break;
float dist_casc = distance / cascade_end[cascade];
vec3 coords = f_light_pos[cascade].xyz / f_light_pos[cascade].w;
// 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
// to the sun, which then show shadow acne stripes. lightview maps view space metres
// to [0,1] shadow map coordinates, so its x/y row lengths give texels per metre.
vec3 shadownormal = normalize(f_normal);
float shadowNdotL = clamp(dot(shadownormal, normalize(-lights[0].dir)), 0.0, 1.0);
mat4 shadowview = lightview[cascade];
float texelspermetre = min(length(vec3(shadowview[0][0], shadowview[1][0], shadowview[2][0])),
length(vec3(shadowview[0][1], shadowview[1][1], shadowview[2][1]))) * float(textureSize(shadowmap, 0).x);
float texelsize = 1.0 / texelspermetre;
vec3 shadowpos = f_pos.xyz + shadownormal * (texelsize * 1.5 * (1.0 - shadowNdotL));
vec4 lightpos = shadowview * vec4(shadowpos, 1.0);
vec3 coords = lightpos.xyz / lightpos.w;
if (coords.z < 0.0)
return 0.0f;