game texts glow, tweaked ui buttons

assets/shaders/stageAdditive.js

@@ -0,0 +1,50 @@
+module.exports = {
+  vertexShader : `
+    varying vec2 uvs;
+    varying vec3 worldPos;
+    void main() {
+      uvs.xy = uv.xy;
+      vec4 p = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+      worldPos = (modelMatrix * vec4( position, 1.0 )).xyz;
+      gl_Position = p;
+    }
+  `,
+
+  fragmentShader: `
+    varying vec2 uvs;
+    varying vec3 worldPos;
+    uniform vec3 tunnelNeon;
+    uniform vec3 leftLaser;
+    uniform vec3 rightLaser;
+    uniform vec3 floorNeon;
+    uniform vec3 textGlow;
+    uniform sampler2D src;
+
+    void main() {
+      float mask;
+      vec4 col = texture2D(src, uvs);
+
+      // tunnel neon
+      mask = step(0.87, uvs.x) *  step(0.5, uvs.y) * (1.0 - step(0.935, uvs.x)) * ( 1.0 - step(0.75, uvs.y));
+      col.xyz = mix(col.xyz, col.xyz * tunnelNeon, mask);
+
+      // floor & corridor neons
+      mask = step(0.935, uvs.x) * step(0.5, uvs.y) * ( 1.0 - step(0.75, uvs.y));
+      col.xyz = mix(col.xyz, col.xyz * floorNeon, mask);
+
+      // left laser
+      mask = step(0.5, uvs.x) * (1.0 - step(0.625, uvs.x)) * (1.0 - step(0.5, uvs.y));
+      col.xyz = mix(col.xyz, col.xyz * leftLaser, mask);
+
+      // right laser
+      mask = step(0.625, uvs.x) * (1.0 - step(0.75, uvs.x)) * (1.0 - step(0.5, uvs.y));
+      col.xyz = mix(col.xyz, col.xyz * rightLaser, mask);
+
+      // text glows
+      mask = step(0.87, uvs.x) *  step(0.25, uvs.y) * (1.0 - step(0.935, uvs.x)) * ( 1.0 - step(0.5, uvs.y));
+      col.xyz = mix(col.xyz, col.xyz * textGlow, mask);
+
+      gl_FragColor = col;
+    }
+  `
+};