phaser/examples/wip/book/fire.js

PIXI.FireFilter = function(width, height, texture)
{
	PIXI.AbstractFilter.call( this );
	
	this.passes = [this];

	var d = new Date();

	var dates = [
		d.getFullYear(), // the year (four digits)
		d.getMonth(),	   // the month (from 0-11)
		d.getDate(),     // the day of the month (from 1-31)
		d.getHours()*60.0*60 + d.getMinutes()*60 + d.getSeconds()
	];

	this.uniforms = {
		resolution: { type: 'f2', value: { x: width, y: height }},
		mouse: { type: 'f2', value: { x: 0, y: 0 }},
		time: { type: 'f', value: 1 }
	};

	//	http://glsl.heroku.com/e#11707.0
	
	//	Heroku shader conversion
	this.fragmentSrc = [

		"#ifdef GL_ES",
		"precision mediump float;",
		"#endif",

		"uniform float time;",
		"uniform vec2 mouse;",
		"uniform vec2 resolution;",

		"vec3 iResolution = vec3(resolution.x,resolution.y,100.);",
		"vec4 iMouse = vec4(mouse.x,mouse.y,5.,5.);",
		"float iGlobalTime = time;",
		"uniform sampler2D iChannel0;",

		"// by @301z",

		"float rand(vec2 n) {",
		"return fract(cos(dot(n, vec2(12.9898, 4.1414))) * 43758.5453);",
	"}",

	"// Genera ruido en función de las coordenadas del pixel",
	"float noise(vec2 n) {",
	"const vec2 d = vec2(0.0, 1.0);",
	"vec2 b = floor(n), f = smoothstep(vec2(0.0), vec2(1.0), fract(n));",
	"return mix(mix(rand(b), rand(b + d.yx), f.x), mix(rand(b + d.xy), rand(b + d.yy), f.x), f.y);",
	"}",

	"// Fractional Brownian Amplitude. Suma varias capas de ruido.",
	"float fbm(vec2 n) {",
	"float total = 0.0, amplitude = 1.0;",
	"for (int i = 0; i < 4; i++) {",
	"total += noise(n) * amplitude;",
	"n += n;",
	"amplitude *= 0.5;",
	"}",
	"return total;",
	"}",

	"void main() {",
	"// Colores",
	"const vec3 c1 = vec3(0.5, 0.0, 0.1); // Rojo oscuro.",
	"const vec3 c2 = vec3(0.9, 0.0, 0.0); // Rojo claro.",
	"const vec3 c3 = vec3(0.2, 0.0, 0.0); // Rojo oscuro.",
	"const vec3 c4 = vec3(1.0, 0.9, 0.0); // Amarillo.",
	"const vec3 c5 = vec3(0.1); // Gris oscuro.",
	"const vec3 c6 = vec3(0.9); // Gris claro.",

	"vec2 p = gl_FragCoord.xy * 8.0 / iResolution.xx; // Desfasa las coordenadas para que haya más cambio de un resultado a los colindantes.",
	"float q = fbm(p - iGlobalTime * 0.1); // Ruido con offset para el movimiento.",
	"vec2 r = vec2(fbm(p + q + iGlobalTime * 0.7 - p.x - p.y), fbm(p + q - iGlobalTime * 0.4));",
	"vec3 c = mix(c1, c2, fbm(p + r)) + mix(c3, c4, r.x) - mix(c5, c6, r.y);",
	"gl_FragColor = vec4(c *",
	"cos(1.57 * gl_FragCoord.y / iResolution.y), // Gradiente más ocuro arriba.",
	"1.0);",
	"}"];



}

PIXI.FireFilter.prototype = Object.create( PIXI.AbstractFilter.prototype );
PIXI.FireFilter.prototype.constructor = PIXI.FireFilter;

Object.defineProperty(PIXI.FireFilter.prototype, 'iGlobalTime', {
    get: function() {
        return this.uniforms.time.value;
    },
    set: function(value) {
    	this.uniforms.time.value = value;
    }
});