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resources/app/client/pixi/webgl/shaders/lighting/effects/black-hole.js

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+/**
+ * Black Hole animation illumination shader
+ */
+class BlackHoleDarknessShader extends AdaptiveDarknessShader {
+
+  /* -------------------------------------------- */
+  /*  GLSL Statics                                */
+  /* -------------------------------------------- */
+
+  /** @inheritdoc */
+  static fragmentShader = `
+  ${this.SHADER_HEADER}
+  ${this.PRNG}
+  ${this.NOISE}
+  ${this.FBMHQ()}
+  ${this.PERCEIVED_BRIGHTNESS}
+
+  // create an emanation composed of n beams, n = intensity
+  vec3 beamsEmanation(in vec2 uv, in float dist, in vec3 pCol) {   
+    float angle = atan(uv.x, uv.y) * INVTWOPI;
+
+    // Create the beams
+    float dad = mix(0.33, 5.0, dist);
+    float beams = fract(angle + sin(dist * 30.0 * (intensity * 0.2) - time + fbm(uv * 10.0 + time * 0.25, 1.0) * dad));
+
+    // Compose the final beams and reverse beams, to get a nice gradient on EACH side of the beams.
+    beams = max(beams, 1.0 - beams);
+
+    // Creating the effect
+    return smoothstep(0.0, 1.1 + (intensity * 0.1), beams * pCol);
+  }
+
+  void main() {
+    ${this.FRAGMENT_BEGIN}
+    vec2 uvs = (2.0 * vUvs) - 1.0;
+    finalColor *= (mix(color, color * 0.66, darknessLevel) * colorationAlpha);
+    float rd = pow(1.0 - dist, 3.0);
+    finalColor = beamsEmanation(uvs, rd, finalColor);
+    ${this.FRAGMENT_END}
+  }`;
+}