first commit

Author: hughsk

.gitignore

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+.DS_Store
+npm-debug.log
+node_modules

.npmignore

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+test.*
+.gitignore
+.DS_Store
+npm-debug.log

LICENSE.md

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+This software is released under the MIT license:
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# glsl-easings [![stable](http://badges.github.io/stability-badges/dist/stable.svg)](http://github.com/badges/stability-badges)
+
+[Robert Penner's easing functions](http://www.robertpenner.com/easing/) in GLSL,
+available as a module for [glslify](http://github.com/chrisdickinson/glslify).
+
+I tried as best I could to make them speedy for GLSL, but I'm sure there are a
+lot of gaps to fill – pull requests welcome!
+
+## Usage
+
+[![NPM](https://nodei.co/npm/glsl-easings.png)](https://nodei.co/npm/glsl-easings/)
+
+Each easing function has its own file which can be required from glslify:
+
+``` glsl
+#pragma glslify: ease = require(glsl-easings/back-in-out)
+#pragma glslify: ease = require(glsl-easings/back-in)
+#pragma glslify: ease = require(glsl-easings/back-out)
+#pragma glslify: ease = require(glsl-easings/bounce-in-out)
+#pragma glslify: ease = require(glsl-easings/bounce-in)
+#pragma glslify: ease = require(glsl-easings/bounce-out)
+#pragma glslify: ease = require(glsl-easings/circular-in-out)
+#pragma glslify: ease = require(glsl-easings/circular-in)
+#pragma glslify: ease = require(glsl-easings/circular-out)
+#pragma glslify: ease = require(glsl-easings/cubic-in-out)
+#pragma glslify: ease = require(glsl-easings/cubic-in)
+#pragma glslify: ease = require(glsl-easings/cubic-out)
+#pragma glslify: ease = require(glsl-easings/elastic-in-out)
+#pragma glslify: ease = require(glsl-easings/elastic-in)
+#pragma glslify: ease = require(glsl-easings/elastic-out)
+#pragma glslify: ease = require(glsl-easings/exponential-in-out)
+#pragma glslify: ease = require(glsl-easings/exponential-in)
+#pragma glslify: ease = require(glsl-easings/exponential-out)
+#pragma glslify: ease = require(glsl-easings/linear)
+#pragma glslify: ease = require(glsl-easings/quadratic-in-out)
+#pragma glslify: ease = require(glsl-easings/quadratic-in)
+#pragma glslify: ease = require(glsl-easings/quadratic-out)
+#pragma glslify: ease = require(glsl-easings/quartic-in-out)
+#pragma glslify: ease = require(glsl-easings/quartic-in)
+#pragma glslify: ease = require(glsl-easings/quartic-out)
+#pragma glslify: ease = require(glsl-easings/quintic-in-out)
+#pragma glslify: ease = require(glsl-easings/quintic-in)
+#pragma glslify: ease = require(glsl-easings/quintic-out)
+#pragma glslify: ease = require(glsl-easings/sine-in-out)
+#pragma glslify: ease = require(glsl-easings/sine-in)
+#pragma glslify: ease = require(glsl-easings/sine-out)
+```
+
+And each function has the following signature:
+
+``` glsl
+float ease(float t)
+```
+
+Where `t` is a value between 0 and 1, returning a new float between 0 and 1.
+
+## License
+
+MIT. See [LICENSE.md](http://github.com/hughsk/glsl-easings/blob/master/LICENSE.md) for details.

back-in-out.glsl

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+#ifndef PI
+#define PI 3.141592653589793
+#endif
+
+float backOut(float t) {
+  float f = t < 0.5
+    ? 2.0 * t
+    : 1.0 - (2.0 * t - 1.0);
+
+  float g = pow(f, 3.0) - f * sin(f * PI);
+
+  return t < 0.5
+    ? 0.5 * g
+    : 0.5 * (1.0 - g) + 0.5;
+}
+
+#pragma glslify: export(backOut)

back-in.glsl

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+#ifndef PI
+#define PI 3.141592653589793
+#endif
+
+float backIn(float t) {
+  return pow(t, 3.0) - t * sin(t * PI);
+}
+
+#pragma glslify: export(backIn)

back-out.glsl

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+#ifndef PI
+#define PI 3.141592653589793
+#endif
+
+float backOut(float t) {
+  float f = 1.0 - t;
+  return 1.0 - (pow(f, 3.0) - f * sin(f * PI));
+}
+
+#pragma glslify: export(backOut)

bounce-in-out.glsl

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+#pragma glslify: bounceOut = require(./bounce-out)
+
+float bounceInOut(float t) {
+  return t < 0.5
+    ? 0.5 * (1.0 - bounceOut(1.0 - t * 2.0))
+    : 0.5 * bounceOut(t * 2.0 - 1.0) + 0.5;
+}
+
+
+
+#pragma glslify: export(bounceInOut)

bounce-in.glsl

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+#pragma glslify: bounceOut = require(./bounce-out)
+
+float bounceIn(float t) {
+  return 1.0 - bounceOut(1.0 - t);
+}
+
+#pragma glslify: export(bounceIn)

bounce-out.glsl

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+#ifndef PI
+#define PI 3.141592653589793
+#endif
+
+float bounceOut(float t) {
+  const float a = 4.0 / 11.0;
+  const float b = 8.0 / 11.0;
+  const float c = 9.0 / 10.0;
+
+  const float ca = 4356.0 / 361.0;
+  const float cb = 35442.0 / 1805.0;
+  const float cc = 16061.0 / 1805.0;
+
+  float t2 = t * t;
+
+  return t < a
+    ? 7.5625 * t2
+    : t < b
+      ? 9.075 * t2 - 9.9 * t + 3.4
+      : t < c
+        ? ca * t2 - cb * t + cc
+        : 10.8 * t * t - 20.52 * t + 10.72;
+}
+
+#pragma glslify: export(bounceOut)