├── .gitignore
├── barrel-pincushion.glsl
├── package.json
├── LICENSE
└── README.md


/.gitignore:
--------------------------------------------------------------------------------
1 | .DS_Store


--------------------------------------------------------------------------------
/barrel-pincushion.glsl:
--------------------------------------------------------------------------------
1 | vec2 barrelPincushion(vec2 uv, float strength) {
2 |     vec2 st = uv - 0.5;
3 |     float radius = 1.0 + strength * dot(st, st);
4 |     return 0.5 + radius * st;
5 | }
6 | 
7 | #pragma glslify: export(barrelPincushion);


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "glsl-barrel-pincushion",
 3 |   "version": "1.0.3",
 4 |   "description": "Distort UV using barrel or pincushion",
 5 |   "main": "barrel-pincushion.glsl",
 6 |   "scripts": {
 7 |     "test": "echo \"Error: no test specified\" && exit 1"
 8 |   },
 9 |   "repository": {
10 |     "type": "git",
11 |     "url": "git+https://github.com/ayamflow/glsl-barrel-pincushion.git"
12 |   },
13 |   "keywords": [
14 |     "glsl",
15 |     "distorstion",
16 |     "barrel",
17 |     "pincushion",
18 |     "fisheye"
19 |   ],
20 |   "author": "Florian Morel",
21 |   "license": "MIT",
22 |   "bugs": {
23 |     "url": "https://github.com/ayamflow/glsl-barrel-pincushion/issues"
24 |   },
25 |   "homepage": "https://github.com/ayamflow/glsl-barrel-pincushion#readme"
26 | }
27 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | The MIT License (MIT)
 2 | 
 3 | Copyright (c) 2014 Florian Morel
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # glsl-barrel-pincushion
 2 | 
 3 | [![stable](http://badges.github.io/stability-badges/dist/stable.svg)](http://github.com/badges/stability-badges)
 4 | 
 5 | Distort the UV with barrel or pincushion effect.
 6 | Adapted from [this shadertoy](https://www.shadertoy.com/view/lttXD4).
 7 | 
 8 | ![glsl-barrel-pincushion](https://i.imgur.com/XiADOcq.jpg)
 9 | 
10 | ### Installation :package:
11 | 
12 | ```bash
13 | npm i glsl-barrel-pincushion -S
14 | ```
15 | 
16 | ### Usage :book:
17 | 
18 | #### barrelPincushion(vec2 st, float strength)
19 | strength > 0 for barrel distortion, strength < 0 for pincushion.
20 | 
21 | ### Example :floppy_disk:
22 | 
23 | ```glsl
24 | uniform float uTime;
25 | #pragma glslify: barrelPincushion = require(glsl-barrel-pincushion)
26 | #pragma glslify: rectangle = require(glsl-2d-primitives/rectangle)
27 | 
28 | attribute vec2 vUv;
29 | 
30 | void main() {
31 |     vec2 st = barrelPincushion(vUv, sin(uTime));
32 |     float shape = rectangle(st, vec2(0.5));
33 |     gl_FragColor = vec4(color, shape);
34 | }
35 | ```
36 | 
37 | [Demo](http://thebookofshaders.com/edit.php?log=180726191628)
38 | 
39 | ### License :pencil:
40 | 
41 | MIT. See [LICENSE](http://github.com/ayamflow/glsl-barrel-pincushion/blob/master/LICENSE) for details.


--------------------------------------------------------------------------------