custommods

.minecraft/shaderpacks/ComplementaryShaders_v4.6/shaders/lib/surface/directionalLightmap.glsl

@@ -0,0 +1,23 @@
+mat3 GetLightmapTBN(vec3 viewPos) {
+    mat3 lightmapTBN = mat3(normalize(dFdx(viewPos)), normalize(dFdy(viewPos)), vec3(0.0));
+    lightmapTBN[2] = cross(lightmapTBN[0], lightmapTBN[1]);
+
+    return lightmapTBN;
+}
+
+float DirectionalLightmap(float lightmap, float lightmapRaw, vec3 normal, mat3 lightmapTBN) {
+    if (lightmap < 0.001) return lightmap;
+
+    vec2 deriv = vec2(dFdx(lightmapRaw), dFdy(lightmapRaw)) * 256.0;
+    vec3 dir = normalize(vec3(deriv.x * lightmapTBN[0] +
+                              0.0005  * lightmapTBN[2] +
+                              deriv.y * lightmapTBN[1]));
+    
+    float pwr = clamp(dot(normal, dir), -1.0, 1.0);
+    if (abs(pwr) > 0.0)
+        pwr = pow(abs(pwr), 9.0 / DIRECTIONAL_LIGHTMAP_STRENGTH) * sign(pwr) * lightmap;
+    if (length(deriv) > 0.001)
+        lightmap = pow(lightmap, 1.0 - pwr);
+
+	return lightmap;
+}