add 'graphics.ssao' setting

res/shaders/effects/deferred_lighting.glsl

@@ -2,23 +2,30 @@
 #include <fog>
 
 vec4 effect() {
-    float ssao = 0.0;
     vec4 pos = texture(u_position, v_uv);
+    float light = 1.0;
+
+#ifdef ENABLE_SSAO
+    light = 0.0;
     float z = pos.z;
     for (int y = -2; y <= 2; y++) {
         for (int x = -2; x <= 2; x++) {
             vec2 offset = vec2(x, y) / u_screenSize;
-            ssao += texture(u_ssao, v_uv + offset * 2.0).r;
+            light += texture(u_ssao, v_uv + offset * 2.0).r;
         }
     }
-    ssao /= 24.0;
+    light /= 24.0;
+#endif // ENABLE_SSAO
+
     vec4 modelpos = u_inverseView * pos;
     vec3 normal = transpose(mat3(u_view)) * texture(u_normal, v_uv).xyz;
     vec3 dir = modelpos.xyz - u_cameraPos;
+
 #ifdef ENABLE_SHADOWS
-    ssao *= max(calc_shadow(modelpos, normal, length(pos)), texture(u_emission, v_uv).r);
+    light *= max(calc_shadow(modelpos, normal, length(pos)), texture(u_emission, v_uv).r);
 #endif
+
     vec3 fogColor = texture(u_skybox, dir).rgb;
     float fog = calc_fog(length(u_view * vec4((modelpos.xyz - u_cameraPos) * FOG_POS_SCALE, 0.0)) / 256.0);
-    return vec4(mix(texture(u_screen, v_uv).rgb * mix(1.0, ssao, 1.0), fogColor, fog), 1.0);
+    return vec4(mix(texture(u_screen, v_uv).rgb * mix(1.0, light, 1.0), fogColor, fog), 1.0);
 }