add highlight rules for glsl

demo/kitchen-sink/docs/glsl.glsl

@@ -0,0 +1,20 @@
+uniform float amplitude;
+attribute float displacement;
+varying vec3 vNormal;
+
+void main() {
+
+    vNormal = normal;
+  
+    // multiply our displacement by the
+    // amplitude. The amp will get animated
+    // so we'll have animated displacement
+    vec3 newPosition = position + 
+                       normal * 
+                       vec3(displacement *
+                            amplitude);
+
+    gl_Position = projectionMatrix *
+                  modelViewMatrix *
+                  vec4(newPosition,1.0);
+}