mirror of
https://github.com/wassname/phaser.git
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photonstorm
117 lines
3.4 KiB
JavaScript
117 lines
3.4 KiB
JavaScript
PIXI.MetaBallsFilter = 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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iMouse: { type: 'f3', value: { x: 0, y: 0, 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, wrap: 'repeat' }
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};
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// Shader by triggerHLM (https://www.shadertoy.com/view/lsfGDH)
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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 stiffness 10.0 // Blobbiness factor (higher = stiffer balls)",
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"#define cfalloff 20.0 // Glow factor (higher = sharper, shorter glow)",
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"void main(void)",
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"{",
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"vec2 uv = gl_FragCoord.xy / iResolution.xy;",
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"// calculate some ball positions (sin is nice for animating)",
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"vec2 ballA = vec2(0.5+0.5*sin(iGlobalTime),0.5+0.5*cos(iGlobalTime));",
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"vec2 ballB = vec2(0.5+0.4*sin(iGlobalTime),0.5+0.4*cos(iGlobalTime*1.3));",
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"vec2 ballC = vec2(0.5+0.4*sin(iGlobalTime*2.0),0.5+0.4*cos(iGlobalTime*1.7));",
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"// calc range-based per-pixel values",
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"// subtract from length to make the ball bigger (every pixel closer)",
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"// clamp to avoid negative distances and fucky values",
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"// invert it so it's closeness to the ball",
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"// raise to power to sharpen the edge of the ball (more sudden falloff from 1.0)",
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"float r1 = pow(1.0-clamp(length(uv-ballA)-0.1,0.0,1.0),stiffness);",
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"float r2 = pow(1.0-clamp(length(uv-ballB)-0.05,0.0,1.0),stiffness);",
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"float r3 = pow(1.0-clamp(length(uv-ballC)-0.025,0.0,1.0),stiffness);",
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"// sum for blobbage!",
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"float v = r1+r2+r3;",
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"// calculate colour",
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"vec3 final = vec3(v,v,v);",
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"final.x = pow(v,cfalloff);",
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"final.y = pow(v,cfalloff);",
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"final.z = pow(v,cfalloff*0.4); // sharpen blue less, for a blue glow",
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"// gimme some pixels baby!",
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"gl_FragColor = vec4(final,1.0);",
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"}"];
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}
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PIXI.MetaBallsFilter.prototype = Object.create( PIXI.AbstractFilter.prototype );
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PIXI.MetaBallsFilter.prototype.constructor = PIXI.MetaBallsFilter;
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Object.defineProperty(PIXI.MetaBallsFilter.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/tex07.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.MetaBallsFilter(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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filter.uniforms.iMouse.value.x = game.input.x;
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filter.uniforms.iMouse.value.y = game.input.y;
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}
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function render() {
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}
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