backglow, fog and tunnel neon colors (events 0 & 1)

assets/shaders/stageAdditive.js

@@ -13,12 +13,14 @@ module.exports = {
   fragmentShader: `
     varying vec2 uvs;
     varying vec3 worldPos;
-    uniform vec3 redColor;
-    uniform vec3 blueColor;
+    uniform vec3 tunnelNeon;
     uniform sampler2D src;
 
     void main() {
       vec4 col = texture2D(src, uvs);
+      float mask = min(step(0.87, uvs.x), step(0.5, uvs.y));
+      mask = min(mask, 1.0 - step(0.75, uvs.y));
+      col.xyz = mix(col.xyz, col.xyz * tunnelNeon, mask);
       gl_FragColor = col;
     }
   `