added stubbe cheapstep

IDMNYU · Dec 23, 2021 · e6047d3 · e6047d3
1 parent 75280a4
commit e6047d3
Showing 1 changed file with 10 additions and 1 deletion.
diff --git a/lib/p5.func.js b/lib/p5.func.js
@@ -1,4 +1,4 @@
-/*! p5.func.js v0.0.1 2017-05-27 */
+/*! p5.func.js v0.0.2 2021-12-23 */
 /**
  * @module p5.func
  * @submodule p5.func
@@ -1718,6 +1718,15 @@
     return(_x*_x*_x*(_x*(_x*6.0 - 15.0) + 10.0));
   }
 
+  // stubbe's 'cheapstep' quartic smoothstep alternative
+  // https://www.shadertoy.com/view/4ldSD2
+  p5.Ease.prototype.cheapStep = function(_x)
+  {
+    _x = 1.0 - _x*_x; // MAD
+    _x = 1.0 - _x*_x; // MAD
+    return(_x)
+  }
+
   // maclaurin cosine approximation
   // http://blogs.ubc.ca/infiniteseriesmodule/units/unit-3-power-series/taylor-series/the-maclaurin-expansion-of-cosx/
   p5.Ease.prototype.maclaurinCosine = function(_x)