make step work like in glsl... step(a,b) returns 0 if b < a, 1 otherwise

2 files changed, 5 insertions, 3 deletions

diff --git a/instructions.html b/instructions.html
index 2767e48..fb522c0 100644
--- a/instructions.html
+++ b/instructions.html
@@ -29,7 +29,7 @@ E, PI, PHI
 <u>convenience functions</u>
 clamp(n,min,max)
 mix(n,a,b) (lerp)
-step(n,a,b)
+step(a,b)
 smoothstep(n,a,b)
 avg(m,n,a)
 cosp, sinp (mapped to [0,1])
diff --git a/js/util.js b/js/util.js
index b728377..46943f9 100644
--- a/js/util.js
+++ b/js/util.js
@@ -56,9 +56,11 @@ function dist(x0,y0,x1,y1){ return sqrt(pow(x1-x0,2)+pow(y1-y0,2)) }
 function angle(x0,y0,x1,y1){ return atan2(y1-y0,x1-x0) }
 function avg(m,n,a){ return (m*(a-1)+n)/a }
 
-function step (n,a,b) {
-  return clamp((n - a) / (b - a), 0.0, 1.0);
+function step(a, b){
+  return (b >= a) + 0 
+               // ^^ bool -> int
 }
+
 // hermite curve apparently
 function smoothstep(n,a,b){
   var t = clamp((n - a) / (b - a), 0.0, 1.0);