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resources/app/client/pixi/webgl/shaders/samplers/fog-of-war.js

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+/**
+ * A simple shader which purpose is to make the original texture red channel the alpha channel,
+ * and still keeping channel informations. Used in cunjunction with the AlphaBlurFilterPass and Fog of War.
+ */
+class FogSamplerShader extends BaseSamplerShader {
+  /** @override */
+  static classPluginName = null;
+
+  /** @override */
+  static fragmentShader = `
+    precision ${PIXI.settings.PRECISION_FRAGMENT} float;
+    uniform sampler2D sampler;
+    uniform vec4 tintAlpha;
+    varying vec2 vUvs;
+    void main() {
+        vec4 color = texture2D(sampler, vUvs);
+        gl_FragColor = vec4(1.0, color.gb, 1.0) * step(0.15, color.r) * tintAlpha;
+    }`;
+}