Patch 1

cubic-in-out.glsl

@@ -1,7 +1,9 @@
 float cubicInOut(float t) {
-  return t < 0.5
-    ? 4.0 * t * t * t
-    : 0.5 * pow(2.0 * t - 2.0, 3.0) + 1.0;
+  if (t < 0.5) {
+    return 4.0 * t * t * t;
+  }
+  float u = 1.0 - t;
+  return 1.0 - 4.0 * u * u * u;
 }
 
 #pragma glslify: export(cubicInOut)

quartic-in-out.glsl

@@ -1,7 +1,9 @@
 float quarticInOut(float t) {
-  return t < 0.5
-    ? +8.0 * pow(t, 4.0)
-    : -8.0 * pow(t - 1.0, 4.0) + 1.0;
+  if (t < 0.5) {
+    return 8.0 * t * t * t * t;
+  }
+  float u = 1.0 - t;
+  return 1.0 - 8.0 * u * u * u * u;
 }
 
 #pragma glslify: export(quarticInOut)

quartic-out.glsl

@@ -1,5 +1,6 @@
 float quarticOut(float t) {
-  return pow(t - 1.0, 3.0) * (1.0 - t) + 1.0;
+  float u = 1.0 - t;
+  return 1.0 - u * u * u * u;
 }
 
 #pragma glslify: export(quarticOut)

quintic-in-out.glsl

@@ -1,7 +1,9 @@
-float qinticInOut(float t) {
-  return t < 0.5
-    ? +16.0 * pow(t, 5.0)
-    : -0.5 * pow(2.0 * t - 2.0, 5.0) + 1.0;
+float quinticInOut(float t) {
+  if (t < 0.5) {
+    return 16.0 * t * t * t * t * t;
+  }
+  float u = 1.0 - t;
+  return 1.0 - 16.0 * u * u * u * u * u;
 }
 
-#pragma glslify: export(qinticInOut)
+#pragma glslify: export(quinticInOut)

quintic-in.glsl

@@ -1,5 +1,5 @@
-float qinticIn(float t) {
-  return pow(t, 5.0);
+float quinticIn(float t) {
+  return t*t*t*t*t;
 }
 
-#pragma glslify: export(qinticIn)
+#pragma glslify: export(quinticIn)

test/visual/index.js

@@ -51,7 +51,7 @@ var shaders = {
   , sineIn           : glslify({ frag: './frag.glsl', vert: './sine-in.glsl' })(gl)
 }
 
-var linear   = glslify({ frag: './blue.glsl', vert: './linear.glsl' })(gl)
+var linear   = glslify({ frag: './frag.glsl', vert: './linear.glsl' })(gl)
 var names    = Object.keys(shaders)
 var selected = null
 var model    = mat4.create()