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

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+/**
+ * Emanation animation coloration shader
+ */
+class EmanationColorationShader extends AdaptiveColorationShader {
+
+  /** @override */
+  static forceDefaultColor = true;
+
+  /** @override */
+  static fragmentShader = `
+  ${this.SHADER_HEADER}
+  ${this.PERCEIVED_BRIGHTNESS}
+
+  // Create an emanation composed of n beams, n = intensity
+  vec3 beamsEmanation(in vec2 uv, in float dist) {
+    float angle = atan(uv.x, uv.y) * INVTWOPI;
+
+    // create the beams
+    float beams = fract( angle * intensity + sin(dist * 10.0 - time));
+
+    // compose the final beams with max, to get a nice gradient on EACH side of the beams.
+    beams = max(beams, 1.0 - beams);
+
+    // creating the effect : applying color and color correction. saturate the entire output color.
+    return smoothstep( 0.0, 1.0, beams * color);
+  }
+
+  void main() {
+    ${this.FRAGMENT_BEGIN}
+    vec2 uvs = (2.0 * vUvs) - 1.0;
+    // apply beams emanation, fade and alpha
+    finalColor = beamsEmanation(uvs, dist) * colorationAlpha;
+    ${this.COLORATION_TECHNIQUES}
+    ${this.ADJUSTMENTS}
+    ${this.FALLOFF}
+    ${this.FRAGMENT_END}
+  }`;
+}