flat-surface-shader.js

//============================================================
//
// Flat Surface Shader
//
// Copyright (C) 2013 Matthew Wagerfield
//
// Twitter: https://twitter.com/mwagerfield
//
// Permission is hereby granted, free of charge, to any
// person obtaining a copy of this software and associated
// documentation files (the "Software"), to deal in the
// Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute,
// sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
//
// The above copyright notice and this permission notice
// shall be included in all copies or substantial portions
// of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY
// OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
// EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
// AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
// OR OTHER DEALINGS IN THE SOFTWARE.
//
//============================================================

function initPlugin() {
  FSS={FRONT:0,BACK:1,DOUBLE:2,SVGNS:"http://www.w3.org/2000/svg"},FSS.Array="function"==typeof Float32Array?Float32Array:Array,FSS.Utils={isNumber:function(t){return!isNaN(parseFloat(t))&&isFinite(t)}},function(){for(var t=0,e=["ms","moz","webkit","o"],i=0;e.length>i&&!window.requestAnimationFrame;++i)window.requestAnimationFrame=window[e[i]+"RequestAnimationFrame"],window.cancelAnimationFrame=window[e[i]+"CancelAnimationFrame"]||window[e[i]+"CancelRequestAnimationFrame"];window.requestAnimationFrame||(window.requestAnimationFrame=function(e){var i=(new Date).getTime(),r=Math.max(0,16-(i-t)),s=window.setTimeout(function(){e(i+r)},r);return t=i+r,s}),window.cancelAnimationFrame||(window.cancelAnimationFrame=function(t){clearTimeout(t)})}(),Math.PIM2=2*Math.PI,Math.PID2=Math.PI/2,Math.randomInRange=function(t,e){return t+(e-t)*Math.random()},Math.clamp=function(t,e,i){return t=Math.max(t,e),t=Math.min(t,i)},FSS.Vector3={create:function(t,e,i){var r=new FSS.Array(3);return this.set(r,t,e,i),r},clone:function(t){var e=this.create();return this.copy(e,t),e},set:function(t,e,i,r){return t[0]=e||0,t[1]=i||0,t[2]=r||0,this},setX:function(t,e){return t[0]=e||0,this},setY:function(t,e){return t[1]=e||0,this},setZ:function(t,e){return t[2]=e||0,this},copy:function(t,e){return t[0]=e[0],t[1]=e[1],t[2]=e[2],this},add:function(t,e){return t[0]+=e[0],t[1]+=e[1],t[2]+=e[2],this},addVectors:function(t,e,i){return t[0]=e[0]+i[0],t[1]=e[1]+i[1],t[2]=e[2]+i[2],this},addScalar:function(t,e){return t[0]+=e,t[1]+=e,t[2]+=e,this},subtract:function(t,e){return t[0]-=e[0],t[1]-=e[1],t[2]-=e[2],this},subtractVectors:function(t,e,i){return t[0]=e[0]-i[0],t[1]=e[1]-i[1],t[2]=e[2]-i[2],this},subtractScalar:function(t,e){return t[0]-=e,t[1]-=e,t[2]-=e,this},multiply:function(t,e){return t[0]*=e[0],t[1]*=e[1],t[2]*=e[2],this},multiplyVectors:function(t,e,i){return t[0]=e[0]*i[0],t[1]=e[1]*i[1],t[2]=e[2]*i[2],this},multiplyScalar:function(t,e){return t[0]*=e,t[1]*=e,t[2]*=e,this},divide:function(t,e){return t[0]/=e[0],t[1]/=e[1],t[2]/=e[2],this},divideVectors:function(t,e,i){return t[0]=e[0]/i[0],t[1]=e[1]/i[1],t[2]=e[2]/i[2],this},divideScalar:function(t,e){return 0!==e?(t[0]/=e,t[1]/=e,t[2]/=e):(t[0]=0,t[1]=0,t[2]=0),this},cross:function(t,e){var i=t[0],r=t[1],s=t[2];return t[0]=r*e[2]-s*e[1],t[1]=s*e[0]-i*e[2],t[2]=i*e[1]-r*e[0],this},crossVectors:function(t,e,i){return t[0]=e[1]*i[2]-e[2]*i[1],t[1]=e[2]*i[0]-e[0]*i[2],t[2]=e[0]*i[1]-e[1]*i[0],this},min:function(t,e){return e>t[0]&&(t[0]=e),e>t[1]&&(t[1]=e),e>t[2]&&(t[2]=e),this},max:function(t,e){return t[0]>e&&(t[0]=e),t[1]>e&&(t[1]=e),t[2]>e&&(t[2]=e),this},clamp:function(t,e,i){return this.min(t,e),this.max(t,i),this},limit:function(t,e,i){var r=this.length(t);return null!==e&&e>r?this.setLength(t,e):null!==i&&r>i&&this.setLength(t,i),this},dot:function(t,e){return t[0]*e[0]+t[1]*e[1]+t[2]*e[2]},normalise:function(t){return this.divideScalar(t,this.length(t))},negate:function(t){return this.multiplyScalar(t,-1)},distanceSquared:function(t,e){var i=t[0]-e[0],r=t[1]-e[1],s=t[2]-e[2];return i*i+r*r+s*s},distance:function(t,e){return Math.sqrt(this.distanceSquared(t,e))},lengthSquared:function(t){return t[0]*t[0]+t[1]*t[1]+t[2]*t[2]},length:function(t){return Math.sqrt(this.lengthSquared(t))},setLength:function(t,e){var i=this.length(t);return 0!==i&&e!==i&&this.multiplyScalar(t,e/i),this}},FSS.Vector4={create:function(t,e,i){var r=new FSS.Array(4);return this.set(r,t,e,i),r},set:function(t,e,i,r,s){return t[0]=e||0,t[1]=i||0,t[2]=r||0,t[3]=s||0,this},setX:function(t,e){return t[0]=e||0,this},setY:function(t,e){return t[1]=e||0,this},setZ:function(t,e){return t[2]=e||0,this},setW:function(t,e){return t[3]=e||0,this},add:function(t,e){return t[0]+=e[0],t[1]+=e[1],t[2]+=e[2],t[3]+=e[3],this},multiplyVectors:function(t,e,i){return t[0]=e[0]*i[0],t[1]=e[1]*i[1],t[2]=e[2]*i[2],t[3]=e[3]*i[3],this},multiplyScalar:function(t,e){return t[0]*=e,t[1]*=e,t[2]*=e,t[3]*=e,this},min:function(t,e){return e>t[0]&&(t[0]=e),e>t[1]&&(t[1]=e),e>t[2]&&(t[2]=e),e>t[3]&&(t[3]=e),this},max:function(t,e){return t[0]>e&&(t[0]=e),t[1]>e&&(t[1]=e),t[2]>e&&(t[2]=e),t[3]>e&&(t[3]=e),this},clamp:function(t,e,i){return this.min(t,e),this.max(t,i),this}},FSS.Color=function(t,e){this.rgba=FSS.Vector4.create(),this.hex=t||"#000000",this.opacity=FSS.Utils.isNumber(e)?e:1,this.set(this.hex,this.opacity)},FSS.Color.prototype={set:function(t,e){t=t.replace("#","");var i=t.length/3;return this.rgba[0]=parseInt(t.substring(0*i,1*i),16)/255,this.rgba[1]=parseInt(t.substring(1*i,2*i),16)/255,this.rgba[2]=parseInt(t.substring(2*i,3*i),16)/255,this.rgba[3]=FSS.Utils.isNumber(e)?e:this.rgba[3],this},hexify:function(t){var e=Math.ceil(255*t).toString(16);return 1===e.length&&(e="0"+e),e},format:function(){var t=this.hexify(this.rgba[0]),e=this.hexify(this.rgba[1]),i=this.hexify(this.rgba[2]);return this.hex="#"+t+e+i,this.hex}},FSS.Object=function(){this.position=FSS.Vector3.create()},FSS.Object.prototype={setPosition:function(t,e,i){return FSS.Vector3.set(this.position,t,e,i),this}},FSS.Light=function(t,e){FSS.Object.call(this),this.ambient=new FSS.Color(t||"#FFFFFF"),this.diffuse=new FSS.Color(e||"#FFFFFF"),this.ray=FSS.Vector3.create()},FSS.Light.prototype=Object.create(FSS.Object.prototype),FSS.Vertex=function(t,e,i){this.position=FSS.Vector3.create(t,e,i)},FSS.Vertex.prototype={setPosition:function(t,e,i){return FSS.Vector3.set(this.position,t,e,i),this}},FSS.Triangle=function(t,e,i){this.a=t||new FSS.Vertex,this.b=e||new FSS.Vertex,this.c=i||new FSS.Vertex,this.vertices=[this.a,this.b,this.c],this.u=FSS.Vector3.create(),this.v=FSS.Vector3.create(),this.centroid=FSS.Vector3.create(),this.normal=FSS.Vector3.create(),this.color=new FSS.Color,this.polygon=document.createElementNS(FSS.SVGNS,"polygon"),this.polygon.setAttributeNS(null,"stroke-linejoin","round"),this.polygon.setAttributeNS(null,"stroke-miterlimit","1"),this.polygon.setAttributeNS(null,"stroke-width","1"),this.computeCentroid(),this.computeNormal()},FSS.Triangle.prototype={computeCentroid:function(){return this.centroid[0]=this.a.position[0]+this.b.position[0]+this.c.position[0],this.centroid[1]=this.a.position[1]+this.b.position[1]+this.c.position[1],this.centroid[2]=this.a.position[2]+this.b.position[2]+this.c.position[2],FSS.Vector3.divideScalar(this.centroid,3),this},computeNormal:function(){return FSS.Vector3.subtractVectors(this.u,this.b.position,this.a.position),FSS.Vector3.subtractVectors(this.v,this.c.position,this.a.position),FSS.Vector3.crossVectors(this.normal,this.u,this.v),FSS.Vector3.normalise(this.normal),this}},FSS.Geometry=function(){this.vertices=[],this.triangles=[],this.dirty=!1},FSS.Geometry.prototype={update:function(){if(this.dirty){var t,e;for(t=this.triangles.length-1;t>=0;t--)e=this.triangles[t],e.computeCentroid(),e.computeNormal();this.dirty=!1}return this}},FSS.Plane=function(t,e,i,r){FSS.Geometry.call(this),this.width=t||100,this.height=e||100,this.segments=i||4,this.slices=r||4,this.segmentWidth=this.width/this.segments,this.sliceHeight=this.height/this.slices;var s,n,o,h,a,l,u,c=[],S=this.width*-.5,f=.5*this.height;for(s=0;this.segments>=s;s++)for(c.push([]),n=0;this.slices>=n;n++)u=new FSS.Vertex(S+s*this.segmentWidth,f-n*this.sliceHeight),c[s].push(u),this.vertices.push(u);for(s=0;this.segments>s;s++)for(n=0;this.slices>n;n++)o=c[s+0][n+0],h=c[s+0][n+1],a=c[s+1][n+0],l=c[s+1][n+1],t0=new FSS.Triangle(o,h,a),t1=new FSS.Triangle(a,h,l),this.triangles.push(t0,t1)},FSS.Plane.prototype=Object.create(FSS.Geometry.prototype),FSS.Material=function(t,e){this.ambient=new FSS.Color(t||"#444444"),this.diffuse=new FSS.Color(e||"#FFFFFF"),this.slave=new FSS.Color},FSS.Mesh=function(t,e){FSS.Object.call(this),this.geometry=t||new FSS.Geometry,this.material=e||new FSS.Material,this.side=FSS.FRONT,this.visible=!0},FSS.Mesh.prototype=Object.create(FSS.Object.prototype),FSS.Mesh.prototype.update=function(t,e){var i,r,s,n,o;if(this.geometry.update(),e)for(i=this.geometry.triangles.length-1;i>=0;i--){for(r=this.geometry.triangles[i],FSS.Vector4.set(r.color.rgba),s=t.length-1;s>=0;s--)n=t[s],FSS.Vector3.subtractVectors(n.ray,n.position,r.centroid),FSS.Vector3.normalise(n.ray),o=FSS.Vector3.dot(r.normal,n.ray),this.side===FSS.FRONT?o=Math.max(o,0):this.side===FSS.BACK?o=Math.abs(Math.min(o,0)):this.side===FSS.DOUBLE&&(o=Math.max(Math.abs(o),0)),FSS.Vector4.multiplyVectors(this.material.slave.rgba,this.material.ambient.rgba,n.ambient.rgba),FSS.Vector4.add(r.color.rgba,this.material.slave.rgba),FSS.Vector4.multiplyVectors(this.material.slave.rgba,this.material.diffuse.rgba,n.diffuse.rgba),FSS.Vector4.multiplyScalar(this.material.slave.rgba,o),FSS.Vector4.add(r.color.rgba,this.material.slave.rgba);FSS.Vector4.clamp(r.color.rgba,0,1)}return this},FSS.Scene=function(){this.meshes=[],this.lights=[]},FSS.Scene.prototype={add:function(t){return t instanceof FSS.Mesh&&!~this.meshes.indexOf(t)?this.meshes.push(t):t instanceof FSS.Light&&!~this.lights.indexOf(t)&&this.lights.push(t),this},remove:function(t){return t instanceof FSS.Mesh&&~this.meshes.indexOf(t)?this.meshes.splice(this.meshes.indexOf(t),1):t instanceof FSS.Light&&~this.lights.indexOf(t)&&this.lights.splice(this.lights.indexOf(t),1),this}},FSS.Renderer=function(){this.width=0,this.height=0,this.halfWidth=0,this.halfHeight=0},FSS.Renderer.prototype={setSize:function(t,e){return this.width!==t||this.height!==e?(this.width=t,this.height=e,this.halfWidth=.5*this.width,this.halfHeight=.5*this.height,this):void 0},clear:function(){return this},render:function(){return this}},FSS.CanvasRenderer=function(){FSS.Renderer.call(this),this.element=document.createElement("canvas"),this.element.style.display="block",this.context=this.element.getContext("2d"),this.setSize(this.element.width,this.element.height)},FSS.CanvasRenderer.prototype=Object.create(FSS.Renderer.prototype),FSS.CanvasRenderer.prototype.setSize=function(t,e){return FSS.Renderer.prototype.setSize.call(this,t,e),this.element.width=t,this.element.height=e,this.context.setTransform(1,0,0,-1,this.halfWidth,this.halfHeight),this},FSS.CanvasRenderer.prototype.clear=function(){return FSS.Renderer.prototype.clear.call(this),this.context.clearRect(-this.halfWidth,-this.halfHeight,this.width,this.height),this},FSS.CanvasRenderer.prototype.render=function(t){FSS.Renderer.prototype.render.call(this,t);var e,i,r,s,n;for(this.clear(),this.context.lineJoin="round",this.context.lineWidth=1,e=t.meshes.length-1;e>=0;e--)if(i=t.meshes[e],i.visible)for(i.update(t.lights,!0),r=i.geometry.triangles.length-1;r>=0;r--)s=i.geometry.triangles[r],n=s.color.format(),this.context.beginPath(),this.context.moveTo(s.a.position[0],s.a.position[1]),this.context.lineTo(s.b.position[0],s.b.position[1]),this.context.lineTo(s.c.position[0],s.c.position[1]),this.context.closePath(),this.context.strokeStyle=n,this.context.fillStyle=n,this.context.stroke(),this.context.fill();return this},FSS.WebGLRenderer=function(){FSS.Renderer.call(this),this.element=document.createElement("canvas"),this.element.style.display="block",this.vertices=null,this.lights=null;var t={preserveDrawingBuffer:!1,premultipliedAlpha:!0,antialias:!0,stencil:!0,alpha:!0};return this.gl=this.getContext(this.element,t),this.unsupported=!this.gl,this.unsupported?"WebGL is not supported by your browser.":(this.gl.clearColor(0,0,0,0),this.gl.enable(this.gl.DEPTH_TEST),this.setSize(this.element.width,this.element.height),void 0)},FSS.WebGLRenderer.prototype=Object.create(FSS.Renderer.prototype),FSS.WebGLRenderer.prototype.getContext=function(t,e){var i=!1;try{if(!(i=t.getContext("experimental-webgl",e)))throw"Error creating WebGL context."}catch(r){console.error(r)}return i},FSS.WebGLRenderer.prototype.setSize=function(t,e){return FSS.Renderer.prototype.setSize.call(this,t,e),this.unsupported?void 0:(this.element.width=t,this.element.height=e,this.gl.viewport(0,0,t,e),this)},FSS.WebGLRenderer.prototype.clear=function(){return FSS.Renderer.prototype.clear.call(this),this.unsupported?void 0:(this.gl.clear(this.gl.COLOR_BUFFER_BIT|this.gl.DEPTH_BUFFER_BIT),this)},FSS.WebGLRenderer.prototype.render=function(t){if(FSS.Renderer.prototype.render.call(this,t),!this.unsupported){var e,i,r,s,n,o,h,a,l,u,c,S,f,m,g,d=!1,p=t.lights.length,F=0;if(this.clear(),this.lights!==p){if(this.lights=p,!(this.lights>0))return;this.buildProgram(p)}if(this.program){for(e=t.meshes.length-1;e>=0;e--)i=t.meshes[e],i.geometry.dirty&&(d=!0),i.update(t.lights,!1),F+=3*i.geometry.triangles.length;if(d||this.vertices!==F){this.vertices=F;for(a in this.program.attributes){for(u=this.program.attributes[a],u.data=new FSS.Array(F*u.size),f=0,e=t.meshes.length-1;e>=0;e--)for(i=t.meshes[e],r=0,s=i.geometry.triangles.length;s>r;r++)for(n=i.geometry.triangles[r],m=0,g=n.vertices.length;g>m;m++){switch(vertex=n.vertices[m],a){case"side":this.setBufferData(f,u,i.side);break;case"position":this.setBufferData(f,u,vertex.position);break;case"centroid":this.setBufferData(f,u,n.centroid);break;case"normal":this.setBufferData(f,u,n.normal);break;case"ambient":this.setBufferData(f,u,i.material.ambient.rgba);break;case"diffuse":this.setBufferData(f,u,i.material.diffuse.rgba)}f++}this.gl.bindBuffer(this.gl.ARRAY_BUFFER,u.buffer),this.gl.bufferData(this.gl.ARRAY_BUFFER,u.data,this.gl.DYNAMIC_DRAW),this.gl.enableVertexAttribArray(u.location),this.gl.vertexAttribPointer(u.location,u.size,this.gl.FLOAT,!1,0,0)}}for(this.setBufferData(0,this.program.uniforms.resolution,[this.width,this.height,this.width]),o=p-1;o>=0;o--)h=t.lights[o],this.setBufferData(o,this.program.uniforms.lightPosition,h.position),this.setBufferData(o,this.program.uniforms.lightAmbient,h.ambient.rgba),this.setBufferData(o,this.program.uniforms.lightDiffuse,h.diffuse.rgba);for(l in this.program.uniforms)switch(u=this.program.uniforms[l],S=u.location,c=u.data,u.structure){case"3f":this.gl.uniform3f(S,c[0],c[1],c[2]);break;case"3fv":this.gl.uniform3fv(S,c);break;case"4fv":this.gl.uniform4fv(S,c)}}return this.gl.drawArrays(this.gl.TRIANGLES,0,this.vertices),this}},FSS.WebGLRenderer.prototype.setBufferData=function(t,e,i){if(FSS.Utils.isNumber(i))e.data[t*e.size]=i;else for(var r=i.length-1;r>=0;r--)e.data[t*e.size+r]=i[r]},FSS.WebGLRenderer.prototype.buildProgram=function(t){if(!this.unsupported){var e=FSS.WebGLRenderer.VS(t),i=FSS.WebGLRenderer.FS(t),r=e+i;if(!this.program||this.program.code!==r){var s=this.gl.createProgram(),n=this.buildShader(this.gl.VERTEX_SHADER,e),o=this.buildShader(this.gl.FRAGMENT_SHADER,i);if(this.gl.attachShader(s,n),this.gl.attachShader(s,o),this.gl.linkProgram(s),!this.gl.getProgramParameter(s,this.gl.LINK_STATUS)){var h=this.gl.getError(),a=this.gl.getProgramParameter(s,this.gl.VALIDATE_STATUS);return console.error("Could not initialise shader.\nVALIDATE_STATUS: "+a+"\nERROR: "+h),null}return this.gl.deleteShader(o),this.gl.deleteShader(n),s.code=r,s.attributes={side:this.buildBuffer(s,"attribute","aSide",1,"f"),position:this.buildBuffer(s,"attribute","aPosition",3,"v3"),centroid:this.buildBuffer(s,"attribute","aCentroid",3,"v3"),normal:this.buildBuffer(s,"attribute","aNormal",3,"v3"),ambient:this.buildBuffer(s,"attribute","aAmbient",4,"v4"),diffuse:this.buildBuffer(s,"attribute","aDiffuse",4,"v4")},s.uniforms={resolution:this.buildBuffer(s,"uniform","uResolution",3,"3f",1),lightPosition:this.buildBuffer(s,"uniform","uLightPosition",3,"3fv",t),lightAmbient:this.buildBuffer(s,"uniform","uLightAmbient",4,"4fv",t),lightDiffuse:this.buildBuffer(s,"uniform","uLightDiffuse",4,"4fv",t)},this.program=s,this.gl.useProgram(this.program),s}}},FSS.WebGLRenderer.prototype.buildShader=function(t,e){if(!this.unsupported){var i=this.gl.createShader(t);return this.gl.shaderSource(i,e),this.gl.compileShader(i),this.gl.getShaderParameter(i,this.gl.COMPILE_STATUS)?i:(console.error(this.gl.getShaderInfoLog(i)),null)}},FSS.WebGLRenderer.prototype.buildBuffer=function(t,e,i,r,s,n){var o={buffer:this.gl.createBuffer(),size:r,structure:s,data:null};switch(e){case"attribute":o.location=this.gl.getAttribLocation(t,i);break;case"uniform":o.location=this.gl.getUniformLocation(t,i)}return n&&(o.data=new FSS.Array(n*r)),o},FSS.WebGLRenderer.VS=function(t){var e=["precision mediump float;","#define LIGHTS "+t,"attribute float aSide;","attribute vec3 aPosition;","attribute vec3 aCentroid;","attribute vec3 aNormal;","attribute vec4 aAmbient;","attribute vec4 aDiffuse;","uniform vec3 uResolution;","uniform vec3 uLightPosition[LIGHTS];","uniform vec4 uLightAmbient[LIGHTS];","uniform vec4 uLightDiffuse[LIGHTS];","varying vec4 vColor;","void main() {","vColor = vec4(0.0);","vec3 position = aPosition / uResolution * 2.0;","for (int i = 0; i < LIGHTS; i++) {","vec3 lightPosition = uLightPosition[i];","vec4 lightAmbient = uLightAmbient[i];","vec4 lightDiffuse = uLightDiffuse[i];","vec3 ray = normalize(lightPosition - aCentroid);","float illuminance = dot(aNormal, ray);","if (aSide == 0.0) {","illuminance = max(illuminance, 0.0);","} else if (aSide == 1.0) {","illuminance = abs(min(illuminance, 0.0));","} else if (aSide == 2.0) {","illuminance = max(abs(illuminance), 0.0);","}","vColor += aAmbient * lightAmbient;","vColor += aDiffuse * lightDiffuse * illuminance;","}","vColor = clamp(vColor, 0.0, 1.0);","gl_Position = vec4(position, 1.0);","}"].join("\n");return e},FSS.WebGLRenderer.FS=function(){var t=["precision mediump float;","varying vec4 vColor;","void main() {","gl_FragColor = vColor;","}"].join("\n");return t},FSS.SVGRenderer=function(){FSS.Renderer.call(this),this.element=document.createElementNS(FSS.SVGNS,"svg"),this.element.setAttribute("xmlns",FSS.SVGNS),this.element.setAttribute("version","1.1"),this.element.style.display="block",this.setSize(300,150)},FSS.SVGRenderer.prototype=Object.create(FSS.Renderer.prototype),FSS.SVGRenderer.prototype.setSize=function(t,e){return FSS.Renderer.prototype.setSize.call(this,t,e),this.element.setAttribute("width",t),this.element.setAttribute("height",e),this},FSS.SVGRenderer.prototype.clear=function(){FSS.Renderer.prototype.clear.call(this);for(var t=this.element.childNodes.length-1;t>=0;t--)this.element.removeChild(this.element.childNodes[t]);return this},FSS.SVGRenderer.prototype.render=function(t){FSS.Renderer.prototype.render.call(this,t);var e,i,r,s,n,o;for(e=t.meshes.length-1;e>=0;e--)if(i=t.meshes[e],i.visible)for(i.update(t.lights,!0),r=i.geometry.triangles.length-1;r>=0;r--)s=i.geometry.triangles[r],s.polygon.parentNode!==this.element&&this.element.appendChild(s.polygon),n=this.formatPoint(s.a)+" ",n+=this.formatPoint(s.b)+" ",n+=this.formatPoint(s.c),o=this.formatStyle(s.color.format()),s.polygon.setAttributeNS(null,"points",n),s.polygon.setAttributeNS(null,"style",o);return this},FSS.SVGRenderer.prototype.formatPoint=function(t){return this.halfWidth+t.position[0]+","+(this.halfHeight-t.position[1])},FSS.SVGRenderer.prototype.formatStyle=function(t){var e="fill:"+t+";";return e+="stroke:"+t+";"};
}

function initBackground() {
  var container = document.getElementById('background-container');
  var output = document.getElementById('background-output');

  if (!config.background.enabled) {
    return;
  }

  initPlugin();

  config.background.LIGHT.bounds = FSS.Vector3.create(),
  config.background.LIGHT.step = FSS.Vector3.create(
      Math.randomInRange(0.2, 1.0),
      Math.randomInRange(0.2, 1.0),
      Math.randomInRange(0.2, 1.0)
  )

  //------------------------------
  // Global Properties
  //------------------------------
  var now, start = Date.now();
  var center = FSS.Vector3.create();
  var attractor = FSS.Vector3.create();
  var renderer, scene, mesh, geometry, material;
  var webglRenderer, canvasRenderer, svgRenderer;
  var gui, autopilotController;


  //------------------------------
  // Methods
  //------------------------------
  function initialise() {
    createRenderer();
    createScene();
    createMesh();
    createLights();
    addEventListeners();
    resize(container.offsetWidth, container.offsetHeight);
    animate();
  }

  function createRenderer() {
    webglRenderer = new FSS.WebGLRenderer();
    canvasRenderer = new FSS.CanvasRenderer();
    svgRenderer = new FSS.SVGRenderer();
    setRenderer(config.background.RENDER.renderer);
  }

  function setRenderer(index) {
    if (renderer) {
      output.removeChild(renderer.element);
    }

    renderer = canvasRenderer;
    renderer.setSize(container.offsetWidth, container.offsetHeight);
    output.appendChild(renderer.element);
  }

  function createScene() {
    scene = new FSS.Scene();
  }

  function createMesh() {
    scene.remove(mesh);
    renderer.clear();
    geometry = new FSS.Plane(config.background.MESH.width * renderer.width, config.background.MESH.height * renderer.height, config.background.MESH.segments, config.background.MESH.slices);
    material = new FSS.Material(config.background.MESH.ambient, config.background.MESH.diffuse);
    mesh = new FSS.Mesh(geometry, material);
    scene.add(mesh);

    // Augment vertices for animation
    var v, vertex;
    for (v = geometry.vertices.length - 1; v >= 0; v--) {
      vertex = geometry.vertices[v];
      vertex.anchor = FSS.Vector3.clone(vertex.position);
      vertex.step = FSS.Vector3.create(
        Math.randomInRange(0.2, 1.0),
        Math.randomInRange(0.2, 1.0),
        Math.randomInRange(0.2, 1.0)
      );
      vertex.time = Math.randomInRange(0, Math.PIM2);
    }
  }

  function createLights() {
    var l, light;
    for (l = scene.lights.length - 1; l >= 0; l--) {
      light = scene.lights[l];
      scene.remove(light);
    }
    renderer.clear();
    for (l = 0; l < config.background.LIGHT.count; l++) {
      light = new FSS.Light(config.background.LIGHT.ambient, config.background.LIGHT.diffuse);
      light.ambientHex = light.ambient.format();
      light.diffuseHex = light.diffuse.format();
      scene.add(light);

      // Augment light for animation
      light.mass = Math.randomInRange(0.5, 1);
      light.velocity = FSS.Vector3.create();
      light.acceleration = FSS.Vector3.create();
      light.force = FSS.Vector3.create();

      // Ring SVG Circle
      light.ring = document.createElementNS(FSS.SVGNS, 'circle');
      light.ring.setAttributeNS(null, 'stroke', light.ambientHex);
      light.ring.setAttributeNS(null, 'stroke-width', '0.5');
      light.ring.setAttributeNS(null, 'fill', 'none');
      light.ring.setAttributeNS(null, 'r', '10');

      // Core SVG Circle
      light.core = document.createElementNS(FSS.SVGNS, 'circle');
      light.core.setAttributeNS(null, 'fill', light.diffuseHex);
      light.core.setAttributeNS(null, 'r', '4');
    }
  }

  function resize(width, height) {
    renderer.setSize(width, height);
    FSS.Vector3.set(center, renderer.halfWidth, renderer.halfHeight);
    createMesh();
  }

  function animate() {
    now = Date.now() - start;
    update();
    render();
    requestAnimationFrame(animate);
  }

  function update() {
    var ox, oy, oz, l, light, v, vertex, offset = config.background.MESH.depth/2;

    // Update Bounds
    FSS.Vector3.copy(config.background.LIGHT.bounds, center);
    FSS.Vector3.multiplyScalar(config.background.LIGHT.bounds, config.background.LIGHT.xyScalar);

    // Update Attractor
    FSS.Vector3.setZ(attractor, config.background.LIGHT.zOffset);

    // Overwrite the Attractor position
    if (config.background.LIGHT.autopilot) {
      ox = Math.sin(config.background.LIGHT.step[0] * now * config.background.LIGHT.speed);
      oy = Math.cos(config.background.LIGHT.step[1] * now * config.background.LIGHT.speed);
      FSS.Vector3.set(attractor,
        config.background.LIGHT.bounds[0]*ox,
        config.background.LIGHT.bounds[1]*oy,
        config.background.LIGHT.zOffset);
    }

    // Animate Lights
    for (l = scene.lights.length - 1; l >= 0; l--) {
      light = scene.lights[l];

      // Reset the z position of the light
      FSS.Vector3.setZ(light.position, config.background.LIGHT.zOffset);

      // Calculate the force Luke!
      var D = Math.clamp(FSS.Vector3.distanceSquared(light.position, attractor), config.background.LIGHT.minDistance, config.background.LIGHT.maxDistance);
      var F = config.background.LIGHT.gravity * light.mass / D;
      FSS.Vector3.subtractVectors(light.force, attractor, light.position);
      FSS.Vector3.normalise(light.force);
      FSS.Vector3.multiplyScalar(light.force, F);

      // Update the light position
      FSS.Vector3.set(light.acceleration);
      FSS.Vector3.add(light.acceleration, light.force);
      FSS.Vector3.add(light.velocity, light.acceleration);
      FSS.Vector3.multiplyScalar(light.velocity, config.background.LIGHT.dampening);
      FSS.Vector3.limit(light.velocity, config.background.LIGHT.minLimit, config.background.LIGHT.maxLimit);
      FSS.Vector3.add(light.position, light.velocity);
    }

    // Animate Vertices
    for (v = geometry.vertices.length - 1; v >= 0; v--) {
      vertex = geometry.vertices[v];
      ox = Math.sin(vertex.time + vertex.step[0] * now * config.background.MESH.speed);
      oy = Math.cos(vertex.time + vertex.step[1] * now * config.background.MESH.speed);
      oz = Math.sin(vertex.time + vertex.step[2] * now * config.background.MESH.speed);
      FSS.Vector3.set(vertex.position,
        config.background.MESH.xRange*geometry.segmentWidth*ox,
        config.background.MESH.yRange*geometry.sliceHeight*oy,
        config.background.MESH.zRange*offset*oz - offset);
      FSS.Vector3.add(vertex.position, vertex.anchor);
    }

    // Set the Geometry to dirty
    geometry.dirty = true;
  }

  function render() {
    renderer.render(scene);

    // Draw Lights
    if (config.background.LIGHT.draw) {
      var l, lx, ly, light;
      for (l = scene.lights.length - 1; l >= 0; l--) {
        light = scene.lights[l];
        lx = light.position[0];
        ly = light.position[1];
        switch(config.background.RENDER.renderer) {
          case CANVAS:
            renderer.context.lineWidth = 0.5;
            renderer.context.beginPath();
            renderer.context.arc(lx, ly, 10, 0, Math.PIM2);
            renderer.context.strokeStyle = light.ambientHex;
            renderer.context.stroke();
            renderer.context.beginPath();
            renderer.context.arc(lx, ly, 4, 0, Math.PIM2);
            renderer.context.fillStyle = light.diffuseHex;
            renderer.context.fill();
            break;
          case SVG:
            lx += renderer.halfWidth;
            ly = renderer.halfHeight - ly;
            light.core.setAttributeNS(null, 'fill', light.diffuseHex);
            light.core.setAttributeNS(null, 'cx', lx);
            light.core.setAttributeNS(null, 'cy', ly);
            renderer.element.appendChild(light.core);
            light.ring.setAttributeNS(null, 'stroke', light.ambientHex);
            light.ring.setAttributeNS(null, 'cx', lx);
            light.ring.setAttributeNS(null, 'cy', ly);
            renderer.element.appendChild(light.ring);
            break;
        }
      }
    }
  }

  function addEventListeners() {
    window.addEventListener('resize', onWindowResize);
    container.addEventListener('click', onMouseClick);
    container.addEventListener('mousemove', onMouseMove);
  }

  //------------------------------
  // Callbacks
  //------------------------------

  function onMouseClick(event) {
    if (config.background.LIGHT.followMouseClicks) {
      FSS.Vector3.set(attractor, event.x, renderer.height - event.y);
      FSS.Vector3.subtract(attractor, center);
      config.background.LIGHT.autopilot = !config.background.LIGHT.autopilot;
      autopilotController.updateDisplay();
    }
  }

  function onMouseMove(event) {
    FSS.Vector3.set(attractor, event.x, renderer.height - event.y);
    FSS.Vector3.subtract(attractor, center);
  }

  function onWindowResize(event) {
    resize(container.offsetWidth, container.offsetHeight);
    render();
  }



  // Let there be light!
  initialise();
}