Initial

resources/app/client/pixi/webgl/shaders/lighting/effects/fog.js

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+/**
+ * Fog animation coloration shader
+ */
+class FogColorationShader extends AdaptiveColorationShader {
+
+  /** @override */
+  static forceDefaultColor = true;
+
+  /** @override */
+  static fragmentShader = `
+  ${this.SHADER_HEADER}
+  ${this.PRNG}
+  ${this.NOISE}
+  ${this.FBM(4, 1.0)}
+  ${this.PERCEIVED_BRIGHTNESS}
+
+  vec3 fog() {
+    // constructing the palette
+    vec3 c1 = color * 0.60;
+    vec3 c2 = color * 0.95;
+    vec3 c3 = color * 0.50;
+    vec3 c4 = color * 0.75;
+    vec3 c5 = vec3(0.3);
+    vec3 c6 = color;
+    
+    // creating the deformation
+    vec2 uv = vUvs;
+    vec2 p = uv.xy * 8.0;
+
+    // time motion fbm and palette mixing
+    float q = fbm(p - time * 0.1);
+    vec2 r = vec2(fbm(p + q - time * 0.5 - p.x - p.y), 
+                  fbm(p + q - time * 0.3));
+    vec3 c = clamp(mix(c1, 
+                       c2, 
+                       fbm(p + r)) + mix(c3, c4, r.x) 
+                                   - mix(c5, c6, r.y),
+                                     vec3(0.0), vec3(1.0));
+    // returning the color
+    return c;
+  }
+
+  void main() {
+    ${this.FRAGMENT_BEGIN}
+    float intens = intensity * 0.2;
+    // applying fog
+    finalColor = fog() * intens * colorationAlpha;
+    ${this.COLORATION_TECHNIQUES}
+    ${this.ADJUSTMENTS}
+    ${this.FALLOFF}
+    ${this.FRAGMENT_END}
+  }`;
+}