effects/seriously.invert.js

/* global define, require */
(function (root, factory) {
	'use strict';

	if (typeof define === 'function' && define.amd) {
		// AMD. Register as an anonymous module.
		define(['seriously'], factory);
	} else if (typeof exports === 'object') {
		// Node/CommonJS
		factory(require('seriously'));
	} else {
		if (!root.Seriously) {
			root.Seriously = { plugin: function (name, opt) { this[name] = opt; } };
		}
		factory(root.Seriously);
	}
}(this, function (Seriously) {
	'use strict';

	Seriously.plugin('invert', {
		commonShader: true,
		shader: function (inputs, shaderSource) {
			shaderSource.fragment = [
				'precision mediump float;',

				'varying vec2 vTexCoord;',

				'uniform sampler2D source;',

				'void main(void) {',
				'	gl_FragColor = texture2D(source, vTexCoord);',
				'	gl_FragColor = vec4(1.0 - gl_FragColor.rgb, gl_FragColor.a);',
				'}'
			].join('\n');
			return shaderSource;
		},
		inPlace: true,
		inputs: {
			source: {
				type: 'image',
				uniform: 'source',
				shaderDirty: false
			}
		},
		title: 'Invert',
		description: 'Invert image color'
	});
}));