mirror of
https://github.com/wassname/phaser.git
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photonstorm
118 lines
2.9 KiB
JavaScript
118 lines
2.9 KiB
JavaScript
PIXI.StarsBackgroundFilter = function(width, height, texture)
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{
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PIXI.AbstractFilter.call( this );
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this.passes = [this];
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var d = new Date();
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var dates = [
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d.getFullYear(), // the year (four digits)
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d.getMonth(), // the month (from 0-11)
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d.getDate(), // the day of the month (from 1-31)
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d.getHours()*60.0*60 + d.getMinutes()*60 + d.getSeconds()
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];
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this.uniforms = {
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iResolution: { type: 'f3', value: { x: width, y: height, z: 0 }},
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iGlobalTime: { type: 'f', value: 1 },
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iDate: { type: 'f4', value: dates },
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iChannel0: { type: 'sampler2D', value: texture }
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};
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// Shader by urraka (https://www.shadertoy.com/view/lsfGWH)
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this.fragmentSrc = [
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"precision mediump float;",
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"uniform vec3 iResolution;",
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"uniform float iGlobalTime;",
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"uniform float iChannelTime[4];",
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"uniform vec4 iMouse;",
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"uniform vec4 iDate;",
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"uniform vec3 iChannelResolution[4];",
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"uniform sampler2D iChannel0;",
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"// add any extra uniforms here",
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"#define M_PI 3.1415926535897932384626433832795",
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"float rand(vec2 co)",
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"{",
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"return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);",
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"}",
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"void main(void)",
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"{",
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"float size = 30.0;",
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"float prob = 0.95;",
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"vec2 pos = floor(1.0 / size * gl_FragCoord.xy);",
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"float color = 0.0;",
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"float starValue = rand(pos);",
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"if (starValue > prob)",
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"{",
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"vec2 center = size * pos + vec2(size, size) * 0.5;",
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"float t = 0.9 + 0.2 * sin(iGlobalTime + (starValue - prob) / (1.0 - prob) * 45.0);",
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"color = 1.0 - distance(gl_FragCoord.xy, center) / (0.5 * size);",
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"color = color * t / (abs(gl_FragCoord.y - center.y)) * t / (abs(gl_FragCoord.x - center.x));",
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"}",
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"else if (rand(gl_FragCoord.xy / iResolution.xy) > 0.996)",
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"{",
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"float r = rand(gl_FragCoord.xy);",
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"color = r * (0.25 * sin(iGlobalTime * (r * 5.0) + 720.0 * r) + 0.75);",
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"}",
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"gl_FragColor = vec4(vec3(color), 1.0);",
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"}"];
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}
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PIXI.StarsBackgroundFilter.prototype = Object.create( PIXI.AbstractFilter.prototype );
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PIXI.StarsBackgroundFilter.prototype.constructor = PIXI.StarsBackgroundFilter;
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Object.defineProperty(PIXI.StarsBackgroundFilter.prototype, 'iGlobalTime', {
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get: function() {
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return this.uniforms.iGlobalTime.value;
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},
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set: function(value) {
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this.uniforms.iGlobalTime.value = value;
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}
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});
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var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { preload: preload, create: create, update: update, render: render });
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function preload() {
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// game.load.image('texture', 'wip/64x64.png');
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game.load.image('texture', 'wip/tex08.jpg');
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}
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var filter;
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var sprite;
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function create() {
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sprite = game.add.sprite(0, 0, 'texture');
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sprite.width = 800;
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sprite.height = 600;
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filter = new PIXI.StarsBackgroundFilter(sprite.width, sprite.height, sprite.texture);
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sprite.filters = [filter];
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}
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function update() {
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filter.iGlobalTime = game.time.totalElapsedSeconds();
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}
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function render() {
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}
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