https://theperfectingchurch.org/wp-content/themes/levelup/assets/j…/seriously.linear-transfer.js?ver=2.0.11

1/* global define, require */
2(function (root, factory) {
3	'use strict';
4
5	if (typeof define === 'function' && define.amd) {
6		// AMD. Register as an anonymous module.
7		define(['seriously'], factory);
8	} else if (typeof exports === 'object') {
9		// Node/CommonJS
10		factory(require('seriously'));
11	} else {
12		if (!root.Seriously) {
13			root.Seriously = { plugin: function (name, opt) { this[name] = opt; } };
14		}
15		factory(root.Seriously);
16	}
17}(window, function (Seriously) {
18	'use strict';
19
20	Seriously.plugin('linear-transfer', {
21		commonShader: true,
22		shader: function (inputs, shaderSource) {
23			shaderSource.fragment = [
24				'precision mediump float;',
25
26				'varying vec2 vTexCoord;',
27
28				'uniform sampler2D source;',
29				'uniform vec4 slope;',
30				'uniform vec4 intercept;',
31
32				'const vec3 half3 = vec3(0.5);',
33
34				'void main(void) {',
35				'	vec4 pixel = texture2D(source, vTexCoord);',
36				'	gl_FragColor = pixel * slope + intercept;',
37				'}'
38			].join('\n');
39			return shaderSource;
40		},
41		inPlace: true,
42		inputs: {
43			source: {
44				type: 'image',
45				uniform: 'source'
46			},
47			slope: {
48				type: 'vector',
49				dimensions: 4,
50				uniform: 'slope',
51				defaultValue: [1, 1, 1, 1]
52			},
53			intercept: {
54				type: 'vector',
55				uniform: 'intercept',
56				dimensions: 4,
57				defaultValue: [0, 0, 0, 0]
58			}
59		},
60		title: 'Linear Transfer',
61		description: 'For each color channel: [slope] * [value] + [intercept]'
62	});
63}));