add 'advanced' post-effect load configuration

res/preload.json

@@ -11,7 +11,10 @@
     ],
     "post-effects": [
         "default",
-        "ssao"
+        {
+            "name": "ssao",
+            "advanced": true
+        }
     ],
     "textures": [
         "gui/menubg",

res/shaders/lib/shadows.glsl

@@ -12,7 +12,7 @@ float calc_shadow() {
     }
 
     float step = 1.0 / float(u_shadowsRes);
-    float s = pow(abs(cos(u_dayTime * 6.283185)), 0.7); // 2*PI precomputed
+    float s = pow(abs(cos(u_dayTime * 6.283185)), 0.5); // 2*PI precomputed
     vec3 normalOffset = a_realnormal * (a_distance > 128.0 ? 0.2 : 0.04);
     int shadowIdx = a_distance > 128.0 ? 1 : 0;