phaser/examples/wip/icosohedronFilter.js

PIXI.IcosohedronFilter = 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 = {
		iResolution: { type: 'f3', value: { x: width, y: height, z: 0 }},
		iGlobalTime: { type: 'f', value: 1 },
		iDate: { type: 'f4', value: dates },
		iChannel0: { type: 'sampler2D', value: texture }
	};

	//	Shader by WouterVanNifterick (https://www.shadertoy.com/view/ldS3Rh)
	this.fragmentSrc = [
		"precision mediump float;",
		"uniform vec3      iResolution;",
		"uniform float     iGlobalTime;",
		"uniform float     iChannelTime[4];",
		"uniform vec4      iMouse;",
		"uniform vec4      iDate;",
		"uniform vec3      iChannelResolution[4];",
		"uniform sampler2D iChannel0;",
		"// add any extra uniforms here",

		"// Tracer code by Ben Weston - 2013",
		"// Geometry, colouring and and animation by Wouter van Nifterick 2013",
		"// License Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.",

		"const float pi2 = 6.28318530717958647692;",

		"const float epsilon = .003;",
		"const float normalPrecision = .1;",
		"const float shadowOffset = .2;",
		"const int traceDepth = 50; // takes time",
		"const float drawDistance = 150.0;",
		"const float stepScale = .9;",

		"const vec3 CamPos = vec3(0,20.0,-20.0);",
		"const vec3 CamLook = vec3(0,0,0);",

		"const vec3 lightDir = vec3(0,1,1);",
		"const vec3 fillLightDir = vec3(0,0,-1);",
		"const vec3 lightColour = vec3(1,.8,.6);",
		"const vec3 fillLightColour = vec3(.05,.15,.25);",


		"float Isosurface( vec3 at )",
		"{",
			"float res=.6;",
			"float n=(1.0+sqrt(5.0))*0.49;",

			"at /= 2.5;",
			"if(length(at) < 5.9)",
			"{",
				"float t =",
				"res =2.0 -",
				"(cos(at.x + n * at.y) +",
				"cos(at.x - n * at.y) +",
				"cos(at.y + n * at.z) +",
				"cos(at.y - n * at.z) +",
				"cos(at.z + n * at.x) +",
				"cos(at.z - n * at.x)) ;",
			"}",
			"return res;",
		"}",

		"vec3 Shading( vec3 pos, vec3 norm, float shadow, vec3 rd )",
		"{",
			"vec3 albedo = vec3(.4);",

			"vec3 l = shadow*lightColour*max(0.0,dot(norm,lightDir));",
			"vec3 fl = fillLightColour*(dot(norm,fillLightDir)*.5+.5);",

			"vec3 view = normalize(-rd);",
			"vec3 h = normalize(view+lightDir);",
			"float specular = pow(max(0.0,dot(h,norm)),200.0);",
			"vec3 res =  albedo*(l+fl) + shadow*specular*22.0*lightColour*0.1;",
			"return res;",
		"}",


		"float Trace( vec3 ro, vec3 rd )",
		"{",
			"float t = 0.0;",
			"float dist = 1.0;",
			"for ( int i=0; i < traceDepth; i++ )",
			"{",
				"if ( abs(dist) < epsilon || t > drawDistance || t < 0.0 )",
				"continue;",
				"dist = Isosurface( ro+rd*t );",
				"t = t+dist*stepScale;",
			"}",

			"return t;",
		"}",

		"// get normal",
		"vec3 GetNormal( vec3 pos )",
		"{",
			"const vec2 delta = vec2(normalPrecision, 0);",
			"vec3 n;",
			"n.x = Isosurface( pos + delta.xyy ) - Isosurface( pos - delta.xyy );",
			"n.y = Isosurface( pos + delta.yxy ) - Isosurface( pos - delta.yxy );",
			"n.z = Isosurface( pos + delta.yyx ) - Isosurface( pos - delta.yyx );",
			"return normalize(n);",
		"}",

		"// camera function by TekF",
		"// compute ray from camera parameters",
		"vec3 GetRay( vec3 dir, float zoom, vec2 uv )",
		"{",
			"uv = uv - .5;",
			"uv.x *= iResolution.x/iResolution.y;",

			"dir = zoom*normalize(dir);",
			"vec3 right = normalize(cross(vec3(0,1,0),dir));",
			"vec3 up = normalize(cross(dir,right));",

			"return dir + right*uv.x + up*uv.y;",
		"}",

		"void main(void)",
		"{",
			"vec2 uv = gl_FragCoord.xy / iResolution.xy;",

			"vec3 camPos = CamPos;",
			"vec3 camLook = CamLook;",

			"vec2 camRot = .5*pi2*(iMouse.xy-iResolution.xy*.5)/iResolution.x;",
			"camRot += iGlobalTime*0.5;",
			"camRot.y = 0.0;",

			"camPos.yz = cos(camRot.y)*camPos.yz* (0.5+sin (iGlobalTime)*0.2) + sin(camRot.y)*camPos.zy*vec2(1,-1);",
			"camPos.xz = cos(camRot.x)*camPos.xz + sin(camRot.x)*camPos.zx*vec2(1,-1);",

			"vec3 rd, ro = camPos;",
			"rd = GetRay( camLook-camPos, 1.0, uv );",

			"float t = Trace(ro,rd);",

			"vec3 result = vec3(0);",
			"if ( t > 0.0 && t < drawDistance )",
			"{",
				"vec3 pos = ro+t*rd;",

				"vec3 norm = GetNormal(pos);",

				"// shadow test",
				"float shadow = 0.0;",
				"if ( Trace( pos+lightDir*shadowOffset, lightDir ) < drawDistance )",
				"shadow = 0.15;",

				"result = Shading( pos, norm, shadow, rd )*6.0;",

				"// fog",
				"result = mix ( vec3(.6+sin(1.0+iGlobalTime)*0.6,.9+cos(iGlobalTime)*0.2,1.1+sin(iGlobalTime)*0.1), result, exp(-t*t*.0005) )*2.0-0.5;",
				"result -= distance(vec2(0),pos.xy)*0.03;",
			"}",

			"gl_FragColor = vec4( result, 1.0 );",
		"}"];



}

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

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

var game = new Phaser.Game(800, 600, Phaser.AUTO, 'phaser-example', { preload: preload, create: create, update: update, render: render });

function preload() {

    // game.load.image('texture', 'wip/64x64.png');
    game.load.image('texture', 'wip/tex16.png');

}

var filter;
var sprite;

function create() {

	sprite = game.add.sprite(0, 0, 'texture');
	sprite.width = 800;
	sprite.height = 600;

	filter = new PIXI.IcosohedronFilter(sprite.width, sprite.height, sprite.texture);

	sprite.filters = [filter];

}

function update() {

	filter.iGlobalTime = game.time.totalElapsedSeconds();

}

function render() {
}