initial: added basic stuff

basic/dancing_funs.glsl

@@ -0,0 +1,31 @@
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+#define PI 3.14159265359
+
+uniform vec2 u_resolution;
+uniform float u_time;
+
+float plot (vec2 st, float pct){
+  return  smoothstep( pct-0.01, pct, st.y) -
+          smoothstep( pct, pct+0.01, st.y);
+}
+
+void main() {
+    vec2 st = gl_FragCoord.xy/u_resolution.xy;
+    vec3 color = vec3(0.0);
+
+    vec3 pct = vec3(st.x);
+
+     pct.r = smoothstep(0.0,1.0, st.x*abs(sin(u_time)));
+     pct.g = sin(st.x*PI*u_time);
+     pct.b = pow(st.x*abs(cos(u_time)),0.5);
+
+    // Plot transition lines for each channel
+    color = mix(vec3(0.0),vec3(1.0,0.0,0.0),plot(st,pct.r));
+    color = mix(color,vec3(0.0,1.0,0.0),plot(st,pct.g));
+    color = mix(color,vec3(0.0,0.0,1.0),plot(st,pct.b));
+
+    gl_FragColor = vec4(color,1.0);
+}