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browserified-example.js
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(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
/** echo * @license echo * while read i do echo * done echo
*/
!function(){var Color,K,PITHIRD,TWOPI,X,Y,Z,bezier,brewer,chroma,clip_rgb,colors,cos,css2rgb,hex2rgb,hsi2rgb,hsl2rgb,hsv2rgb,lab2lch,lab2rgb,lab_xyz,lch2lab,lch2rgb,limit,luminance,luminance_x,rgb2hex,rgb2hsi,rgb2hsl,rgb2hsv,rgb2lab,rgb2lch,rgb_xyz,root,type,unpack,xyz_lab,xyz_rgb,_ref;chroma=function(x,y,z,m){return new Color(x,y,z,m)};if(typeof module!=="undefined"&&module!==null&&module.exports!=null){module.exports=chroma}if(typeof define==="function"&&define.amd){define([],function(){return chroma})}else{root=typeof exports!=="undefined"&&exports!==null?exports:this;root.chroma=chroma}chroma.color=function(x,y,z,m){return new Color(x,y,z,m)};chroma.hsl=function(h,s,l,a){return new Color(h,s,l,a,"hsl")};chroma.hsv=function(h,s,v,a){return new Color(h,s,v,a,"hsv")};chroma.rgb=function(r,g,b,a){return new Color(r,g,b,a,"rgb")};chroma.hex=function(x){return new Color(x)};chroma.css=function(x){return new Color(x)};chroma.lab=function(l,a,b){return new Color(l,a,b,"lab")};chroma.lch=function(l,c,h){return new Color(l,c,h,"lch")};chroma.hsi=function(h,s,i){return new Color(h,s,i,"hsi")};chroma.gl=function(r,g,b,a){return new Color(r*255,g*255,b*255,a,"gl")};chroma.interpolate=function(a,b,f,m){if(a==null||b==null){return"#000"}if(type(a)==="string"){a=new Color(a)}if(type(b)==="string"){b=new Color(b)}return a.interpolate(f,b,m)};chroma.mix=chroma.interpolate;chroma.contrast=function(a,b){var l1,l2;if(type(a)==="string"){a=new Color(a)}if(type(b)==="string"){b=new Color(b)}l1=a.luminance();l2=b.luminance();if(l1>l2){return(l1+.05)/(l2+.05)}else{return(l2+.05)/(l1+.05)}};chroma.luminance=function(color){return chroma(color).luminance()};chroma._Color=Color;Color=function(){function Color(){var a,arg,args,m,me,me_rgb,x,y,z,_i,_len,_ref,_ref1,_ref2,_ref3,_ref4;me=this;args=[];for(_i=0,_len=arguments.length;_i<_len;_i++){arg=arguments[_i];if(arg!=null){args.push(arg)}}if(args.length===0){_ref=[255,0,255,1,"rgb"],x=_ref[0],y=_ref[1],z=_ref[2],a=_ref[3],m=_ref[4]}else if(type(args[0])==="array"){if(args[0].length===3){_ref1=args[0],x=_ref1[0],y=_ref1[1],z=_ref1[2];a=1}else if(args[0].length===4){_ref2=args[0],x=_ref2[0],y=_ref2[1],z=_ref2[2],a=_ref2[3]}else{throw"unknown input argument"}m=(_ref3=args[1])!=null?_ref3:"rgb"}else if(type(args[0])==="string"){x=args[0];m="hex"}else if(type(args[0])==="object"){_ref4=args[0]._rgb,x=_ref4[0],y=_ref4[1],z=_ref4[2],a=_ref4[3];m="rgb"}else if(args.length>=3){x=args[0];y=args[1];z=args[2]}if(args.length===3){m="rgb";a=1}else if(args.length===4){if(type(args[3])==="string"){m=args[3];a=1}else if(type(args[3])==="number"){m="rgb";a=args[3]}}else if(args.length===5){a=args[3];m=args[4]}if(a==null){a=1}if(m==="rgb"){me._rgb=[x,y,z,a]}else if(m==="gl"){me._rgb=[x*255,y*255,z*255,a]}else if(m==="hsl"){me._rgb=hsl2rgb(x,y,z);me._rgb[3]=a}else if(m==="hsv"){me._rgb=hsv2rgb(x,y,z);me._rgb[3]=a}else if(m==="hex"){me._rgb=hex2rgb(x)}else if(m==="lab"){me._rgb=lab2rgb(x,y,z);me._rgb[3]=a}else if(m==="lch"){me._rgb=lch2rgb(x,y,z);me._rgb[3]=a}else if(m==="hsi"){me._rgb=hsi2rgb(x,y,z);me._rgb[3]=a}me_rgb=clip_rgb(me._rgb)}Color.prototype.rgb=function(){return this._rgb.slice(0,3)};Color.prototype.rgba=function(){return this._rgb};Color.prototype.hex=function(){return rgb2hex(this._rgb)};Color.prototype.toString=function(){return this.name()};Color.prototype.hsl=function(){return rgb2hsl(this._rgb)};Color.prototype.hsv=function(){return rgb2hsv(this._rgb)};Color.prototype.lab=function(){return rgb2lab(this._rgb)};Color.prototype.lch=function(){return rgb2lch(this._rgb)};Color.prototype.hsi=function(){return rgb2hsi(this._rgb)};Color.prototype.gl=function(){return[this._rgb[0]/255,this._rgb[1]/255,this._rgb[2]/255,this._rgb[3]]};Color.prototype.luminance=function(lum,mode){var cur_lum,eps,max_iter,test;if(mode==null){mode="rgb"}if(!arguments.length){return luminance(this._rgb)}if(lum===0){this._rgb=[0,0,0,this._rgb[3]]}if(lum===1){this._rgb=[255,255,255,this._rgb[3]]}cur_lum=luminance(this._rgb);eps=1e-7;max_iter=20;test=function(l,h){var lm,m;m=l.interpolate(.5,h,mode);lm=m.luminance();if(Math.abs(lum-lm)<eps||!max_iter--){return m}if(lm>lum){return test(l,m)}return test(m,h)};this._rgb=(cur_lum>lum?test(new Color("black"),this):test(this,new Color("white"))).rgba();return this};Color.prototype.name=function(){var h,k;h=this.hex();for(k in chroma.colors){if(h===chroma.colors[k]){return k}}return h};Color.prototype.alpha=function(alpha){if(arguments.length){this._rgb[3]=alpha;return this}return this._rgb[3]};Color.prototype.css=function(mode){var hsl,me,rgb,rnd;if(mode==null){mode="rgb"}me=this;rgb=me._rgb;if(mode.length===3&&rgb[3]<1){mode+="a"}if(mode==="rgb"){return mode+"("+rgb.slice(0,3).map(Math.round).join(",")+")"}else if(mode==="rgba"){return mode+"("+rgb.slice(0,3).map(Math.round).join(",")+","+rgb[3]+")"}else if(mode==="hsl"||mode==="hsla"){hsl=me.hsl();rnd=function(a){return Math.round(a*100)/100};hsl[0]=rnd(hsl[0]);hsl[1]=rnd(hsl[1]*100)+"%";hsl[2]=rnd(hsl[2]*100)+"%";if(mode.length===4){hsl[3]=rgb[3]}return mode+"("+hsl.join(",")+")"}};Color.prototype.interpolate=function(f,col,m){var dh,hue,hue0,hue1,lbv,lbv0,lbv1,me,res,sat,sat0,sat1,xyz0,xyz1;me=this;if(m==null){m="rgb"}if(type(col)==="string"){col=new Color(col)}if(m==="hsl"||m==="hsv"||m==="lch"||m==="hsi"){if(m==="hsl"){xyz0=me.hsl();xyz1=col.hsl()}else if(m==="hsv"){xyz0=me.hsv();xyz1=col.hsv()}else if(m==="hsi"){xyz0=me.hsi();xyz1=col.hsi()}else if(m==="lch"){xyz0=me.lch();xyz1=col.lch()}if(m.substr(0,1)==="h"){hue0=xyz0[0],sat0=xyz0[1],lbv0=xyz0[2];hue1=xyz1[0],sat1=xyz1[1],lbv1=xyz1[2]}else{lbv0=xyz0[0],sat0=xyz0[1],hue0=xyz0[2];lbv1=xyz1[0],sat1=xyz1[1],hue1=xyz1[2]}if(!isNaN(hue0)&&!isNaN(hue1)){if(hue1>hue0&&hue1-hue0>180){dh=hue1-(hue0+360)}else if(hue1<hue0&&hue0-hue1>180){dh=hue1+360-hue0}else{dh=hue1-hue0}hue=hue0+f*dh}else if(!isNaN(hue0)){hue=hue0;if((lbv1===1||lbv1===0)&&m!=="hsv"){sat=sat0}}else if(!isNaN(hue1)){hue=hue1;if((lbv0===1||lbv0===0)&&m!=="hsv"){sat=sat1}}else{hue=Number.NaN}if(sat==null){sat=sat0+f*(sat1-sat0)}lbv=lbv0+f*(lbv1-lbv0);if(m.substr(0,1)==="h"){res=new Color(hue,sat,lbv,m)}else{res=new Color(lbv,sat,hue,m)}}else if(m==="rgb"){xyz0=me._rgb;xyz1=col._rgb;res=new Color(xyz0[0]+f*(xyz1[0]-xyz0[0]),xyz0[1]+f*(xyz1[1]-xyz0[1]),xyz0[2]+f*(xyz1[2]-xyz0[2]),m)}else if(m==="lab"){xyz0=me.lab();xyz1=col.lab();res=new Color(xyz0[0]+f*(xyz1[0]-xyz0[0]),xyz0[1]+f*(xyz1[1]-xyz0[1]),xyz0[2]+f*(xyz1[2]-xyz0[2]),m)}else{throw"color mode "+m+" is not supported"}res.alpha(me.alpha()+f*(col.alpha()-me.alpha()));return res};Color.prototype.premultiply=function(){var a,rgb;rgb=this.rgb();a=this.alpha();return chroma(rgb[0]*a,rgb[1]*a,rgb[2]*a,a)};Color.prototype.darken=function(amount){var lch,me;if(amount==null){amount=20}me=this;lch=me.lch();lch[0]-=amount;return chroma.lch(lch).alpha(me.alpha())};Color.prototype.darker=function(amount){return this.darken(amount)};Color.prototype.brighten=function(amount){if(amount==null){amount=20}return this.darken(-amount)};Color.prototype.brighter=function(amount){return this.brighten(amount)};Color.prototype.saturate=function(amount){var lch,me;if(amount==null){amount=20}me=this;lch=me.lch();lch[1]+=amount;return chroma.lch(lch).alpha(me.alpha())};Color.prototype.desaturate=function(amount){if(amount==null){amount=20}return this.saturate(-amount)};return Color}();clip_rgb=function(rgb){var i;for(i in rgb){if(i<3){if(rgb[i]<0){rgb[i]=0}if(rgb[i]>255){rgb[i]=255}}else if(i===3){if(rgb[i]<0){rgb[i]=0}if(rgb[i]>1){rgb[i]=1}}}return rgb};css2rgb=function(css){var hsl,i,m,rgb,_i,_j,_k,_l;css=css.toLowerCase();if(chroma.colors!=null&&chroma.colors[css]){return hex2rgb(chroma.colors[css])}if(m=css.match(/rgb\(\s*(\-?\d+),\s*(\-?\d+)\s*,\s*(\-?\d+)\s*\)/)){rgb=m.slice(1,4);for(i=_i=0;_i<=2;i=++_i){rgb[i]=+rgb[i]}rgb[3]=1}else if(m=css.match(/rgba\(\s*(\-?\d+),\s*(\-?\d+)\s*,\s*(\-?\d+)\s*,\s*([01]|[01]?\.\d+)\)/)){rgb=m.slice(1,5);for(i=_j=0;_j<=3;i=++_j){rgb[i]=+rgb[i]}}else if(m=css.match(/rgb\(\s*(\-?\d+(?:\.\d+)?)%,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*\)/)){rgb=m.slice(1,4);for(i=_k=0;_k<=2;i=++_k){rgb[i]=Math.round(rgb[i]*2.55)}rgb[3]=1}else if(m=css.match(/rgba\(\s*(\-?\d+(?:\.\d+)?)%,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*([01]|[01]?\.\d+)\)/)){rgb=m.slice(1,5);for(i=_l=0;_l<=2;i=++_l){rgb[i]=Math.round(rgb[i]*2.55)}rgb[3]=+rgb[3]}else if(m=css.match(/hsl\(\s*(\-?\d+(?:\.\d+)?),\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*\)/)){hsl=m.slice(1,4);hsl[1]*=.01;hsl[2]*=.01;rgb=hsl2rgb(hsl);rgb[3]=1}else if(m=css.match(/hsla\(\s*(\-?\d+(?:\.\d+)?),\s*(\-?\d+(?:\.\d+)?)%\s*,\s*(\-?\d+(?:\.\d+)?)%\s*,\s*([01]|[01]?\.\d+)\)/)){hsl=m.slice(1,4);hsl[1]*=.01;hsl[2]*=.01;rgb=hsl2rgb(hsl);rgb[3]=+m[4]}return rgb};hex2rgb=function(hex){var a,b,g,r,rgb,u;if(hex.match(/^#?([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$/)){if(hex.length===4||hex.length===7){hex=hex.substr(1)}if(hex.length===3){hex=hex.split("");hex=hex[0]+hex[0]+hex[1]+hex[1]+hex[2]+hex[2]}u=parseInt(hex,16);r=u>>16;g=u>>8&255;b=u&255;return[r,g,b,1]}if(hex.match(/^#?([A-Fa-f0-9]{8})$/)){if(hex.length===9){hex=hex.substr(1)}u=parseInt(hex,16);r=u>>24&255;g=u>>16&255;b=u>>8&255;a=u&255;return[r,g,b,a]}if(rgb=css2rgb(hex)){return rgb}throw"unknown color: "+hex};hsi2rgb=function(h,s,i){var b,g,r,_ref;_ref=unpack(arguments),h=_ref[0],s=_ref[1],i=_ref[2];h/=360;if(h<1/3){b=(1-s)/3;r=(1+s*cos(TWOPI*h)/cos(PITHIRD-TWOPI*h))/3;g=1-(b+r)}else if(h<2/3){h-=1/3;r=(1-s)/3;g=(1+s*cos(TWOPI*h)/cos(PITHIRD-TWOPI*h))/3;b=1-(r+g)}else{h-=2/3;g=(1-s)/3;b=(1+s*cos(TWOPI*h)/cos(PITHIRD-TWOPI*h))/3;r=1-(g+b)}r=limit(i*r*3);g=limit(i*g*3);b=limit(i*b*3);return[r*255,g*255,b*255]};hsl2rgb=function(){var b,c,g,h,i,l,r,s,t1,t2,t3,_i,_ref,_ref1;_ref=unpack(arguments),h=_ref[0],s=_ref[1],l=_ref[2];if(s===0){r=g=b=l*255}else{t3=[0,0,0];c=[0,0,0];t2=l<.5?l*(1+s):l+s-l*s;t1=2*l-t2;h/=360;t3[0]=h+1/3;t3[1]=h;t3[2]=h-1/3;for(i=_i=0;_i<=2;i=++_i){if(t3[i]<0){t3[i]+=1}if(t3[i]>1){t3[i]-=1}if(6*t3[i]<1){c[i]=t1+(t2-t1)*6*t3[i]}else if(2*t3[i]<1){c[i]=t2}else if(3*t3[i]<2){c[i]=t1+(t2-t1)*(2/3-t3[i])*6}else{c[i]=t1}}_ref1=[Math.round(c[0]*255),Math.round(c[1]*255),Math.round(c[2]*255)],r=_ref1[0],g=_ref1[1],b=_ref1[2]}return[r,g,b]};hsv2rgb=function(){var b,f,g,h,i,p,q,r,s,t,v,_ref,_ref1,_ref2,_ref3,_ref4,_ref5,_ref6;_ref=unpack(arguments),h=_ref[0],s=_ref[1],v=_ref[2];v*=255;if(s===0){r=g=b=v}else{if(h===360){h=0}if(h>360){h-=360}if(h<0){h+=360}h/=60;i=Math.floor(h);f=h-i;p=v*(1-s);q=v*(1-s*f);t=v*(1-s*(1-f));switch(i){case 0:_ref1=[v,t,p],r=_ref1[0],g=_ref1[1],b=_ref1[2];break;case 1:_ref2=[q,v,p],r=_ref2[0],g=_ref2[1],b=_ref2[2];break;case 2:_ref3=[p,v,t],r=_ref3[0],g=_ref3[1],b=_ref3[2];break;case 3:_ref4=[p,q,v],r=_ref4[0],g=_ref4[1],b=_ref4[2];break;case 4:_ref5=[t,p,v],r=_ref5[0],g=_ref5[1],b=_ref5[2];break;case 5:_ref6=[v,p,q],r=_ref6[0],g=_ref6[1],b=_ref6[2]}}r=Math.round(r);g=Math.round(g);b=Math.round(b);return[r,g,b]};K=18;X=.95047;Y=1;Z=1.08883;lab2lch=function(){var a,b,c,h,l,_ref;_ref=unpack(arguments),l=_ref[0],a=_ref[1],b=_ref[2];c=Math.sqrt(a*a+b*b);h=Math.atan2(b,a)/Math.PI*180;return[l,c,h]};lab2rgb=function(l,a,b){var g,r,x,y,z,_ref,_ref1;if(l!==void 0&&l.length===3){_ref=l,l=_ref[0],a=_ref[1],b=_ref[2]}if(l!==void 0&&l.length===3){_ref1=l,l=_ref1[0],a=_ref1[1],b=_ref1[2]}y=(l+16)/116;x=y+a/500;z=y-b/200;x=lab_xyz(x)*X;y=lab_xyz(y)*Y;z=lab_xyz(z)*Z;r=xyz_rgb(3.2404542*x-1.5371385*y-.4985314*z);g=xyz_rgb(-.969266*x+1.8760108*y+.041556*z);b=xyz_rgb(.0556434*x-.2040259*y+1.0572252*z);return[limit(r,0,255),limit(g,0,255),limit(b,0,255),1]};lab_xyz=function(x){if(x>.206893034){return x*x*x}else{return(x-4/29)/7.787037}};xyz_rgb=function(r){return Math.round(255*(r<=.00304?12.92*r:1.055*Math.pow(r,1/2.4)-.055))};lch2lab=function(){var c,h,l,_ref;_ref=unpack(arguments),l=_ref[0],c=_ref[1],h=_ref[2];h=h*Math.PI/180;return[l,Math.cos(h)*c,Math.sin(h)*c]};lch2rgb=function(l,c,h){var L,a,b,g,r,_ref,_ref1;_ref=lch2lab(l,c,h),L=_ref[0],a=_ref[1],b=_ref[2];_ref1=lab2rgb(L,a,b),r=_ref1[0],g=_ref1[1],b=_ref1[2];return[limit(r,0,255),limit(g,0,255),limit(b,0,255)]};luminance=function(r,g,b){var _ref;_ref=unpack(arguments),r=_ref[0],g=_ref[1],b=_ref[2];r=luminance_x(r);g=luminance_x(g);b=luminance_x(b);return.2126*r+.7152*g+.0722*b};luminance_x=function(x){x/=255;if(x<=.03928){return x/12.92}else{return Math.pow((x+.055)/1.055,2.4)}};rgb2hex=function(){var b,g,r,str,u,_ref;_ref=unpack(arguments),r=_ref[0],g=_ref[1],b=_ref[2];u=r<<16|g<<8|b;str="000000"+u.toString(16);return"#"+str.substr(str.length-6)};rgb2hsi=function(){var TWOPI,b,g,h,i,min,r,s,_ref;_ref=unpack(arguments),r=_ref[0],g=_ref[1],b=_ref[2];TWOPI=Math.PI*2;r/=255;g/=255;b/=255;min=Math.min(r,g,b);i=(r+g+b)/3;s=1-min/i;if(s===0){h=0}else{h=(r-g+(r-b))/2;h/=Math.sqrt((r-g)*(r-g)+(r-b)*(g-b));h=Math.acos(h);if(b>g){h=TWOPI-h}h/=TWOPI}return[h*360,s,i]};rgb2hsl=function(r,g,b){var h,l,max,min,s,_ref;if(r!==void 0&&r.length>=3){_ref=r,r=_ref[0],g=_ref[1],b=_ref[2]}r/=255;g/=255;b/=255;min=Math.min(r,g,b);max=Math.max(r,g,b);l=(max+min)/2;if(max===min){s=0;h=Number.NaN}else{s=l<.5?(max-min)/(max+min):(max-min)/(2-max-min)}if(r===max){h=(g-b)/(max-min)}else if(g===max){h=2+(b-r)/(max-min)}else if(b===max){h=4+(r-g)/(max-min)}h*=60;if(h<0){h+=360}return[h,s,l]};rgb2hsv=function(){var b,delta,g,h,max,min,r,s,v,_ref;_ref=unpack(arguments),r=_ref[0],g=_ref[1],b=_ref[2];min=Math.min(r,g,b);max=Math.max(r,g,b);delta=max-min;v=max/255;if(max===0){h=Number.NaN;s=0}else{s=delta/max;if(r===max){h=(g-b)/delta}if(g===max){h=2+(b-r)/delta}if(b===max){h=4+(r-g)/delta}h*=60;if(h<0){h+=360}}return[h,s,v]};rgb2lab=function(){var b,g,r,x,y,z,_ref;_ref=unpack(arguments),r=_ref[0],g=_ref[1],b=_ref[2];r=rgb_xyz(r);g=rgb_xyz(g);b=rgb_xyz(b);x=xyz_lab((.4124564*r+.3575761*g+.1804375*b)/X);y=xyz_lab((.2126729*r+.7151522*g+.072175*b)/Y);z=xyz_lab((.0193339*r+.119192*g+.9503041*b)/Z);return[116*y-16,500*(x-y),200*(y-z)]};rgb_xyz=function(r){if((r/=255)<=.04045){return r/12.92}else{return Math.pow((r+.055)/1.055,2.4)}};xyz_lab=function(x){if(x>.008856){return Math.pow(x,1/3)}else{return 7.787037*x+4/29}};rgb2lch=function(){var a,b,g,l,r,_ref,_ref1;_ref=unpack(arguments),r=_ref[0],g=_ref[1],b=_ref[2];_ref1=rgb2lab(r,g,b),l=_ref1[0],a=_ref1[1],b=_ref1[2];return lab2lch(l,a,b)};chroma.scale=function(colors,positions){var classifyValue,f,getClass,getColor,resetCache,setColors,setDomain,tmap,_colorCache,_colors,_correctLightness,_domain,_fixed,_max,_min,_mode,_nacol,_numClasses,_out,_pos,_spread;_mode="rgb";_nacol=chroma("#ccc");_spread=0;_fixed=false;_domain=[0,1];_colors=[];_out=false;_pos=[];_min=0;_max=1;_correctLightness=false;_numClasses=0;_colorCache={};setColors=function(colors,positions){var c,col,_i,_j,_ref,_ref1,_ref2;if(colors==null){colors=["#ddd","#222"]}if(colors!=null&&type(colors)==="string"&&((_ref=chroma.brewer)!=null?_ref[colors]:void 0)!=null){colors=chroma.brewer[colors]}if(type(colors)==="array"){colors=colors.slice(0);for(c=_i=0,_ref1=colors.length-1;0<=_ref1?_i<=_ref1:_i>=_ref1;c=0<=_ref1?++_i:--_i){col=colors[c];if(type(col)==="string"){colors[c]=chroma(col)}}if(positions!=null){_pos=positions}else{_pos=[];for(c=_j=0,_ref2=colors.length-1;0<=_ref2?_j<=_ref2:_j>=_ref2;c=0<=_ref2?++_j:--_j){_pos.push(c/(colors.length-1))}}}resetCache();return _colors=colors};setDomain=function(domain){if(domain==null){domain=[]}_domain=domain;_min=domain[0];_max=domain[domain.length-1];resetCache();if(domain.length===2){return _numClasses=0}else{return _numClasses=domain.length-1}};getClass=function(value){var i,n;if(_domain!=null){n=_domain.length-1;i=0;while(i<n&&value>=_domain[i]){i++}return i-1}return 0};tmap=function(t){return t};classifyValue=function(value){var i,maxc,minc,n,val;val=value;if(_domain.length>2){n=_domain.length-1;i=getClass(value);minc=_domain[0]+(_domain[1]-_domain[0])*(0+_spread*.5);maxc=_domain[n-1]+(_domain[n]-_domain[n-1])*(1-_spread*.5);val=_min+(_domain[i]+(_domain[i+1]-_domain[i])*.5-minc)/(maxc-minc)*(_max-_min)}return val};getColor=function(val,bypassMap){var c,col,f0,i,k,p,t,_i,_ref;if(bypassMap==null){bypassMap=false}if(isNaN(val)){return _nacol}if(!bypassMap){if(_domain.length>2){c=getClass(val);t=c/(_numClasses-1)}else{t=f0=_min!==_max?(val-_min)/(_max-_min):0;t=f0=(val-_min)/(_max-_min);t=Math.min(1,Math.max(0,t))}}else{t=val}if(!bypassMap){t=tmap(t)}k=Math.floor(t*1e4);if(_colorCache[k]){col=_colorCache[k]}else{if(type(_colors)==="array"){for(i=_i=0,_ref=_pos.length-1;0<=_ref?_i<=_ref:_i>=_ref;i=0<=_ref?++_i:--_i){p=_pos[i];if(t<=p){col=_colors[i];break}if(t>=p&&i===_pos.length-1){col=_colors[i];break}if(t>p&&t<_pos[i+1]){t=(t-p)/(_pos[i+1]-p);col=chroma.interpolate(_colors[i],_colors[i+1],t,_mode);break}}}else if(type(_colors)==="function"){col=_colors(t)}_colorCache[k]=col}return col};resetCache=function(){return _colorCache={}};setColors(colors,positions);f=function(v){var c;c=getColor(v);if(_out&&c[_out]){return c[_out]()}else{return c}};f.domain=function(domain,classes,mode,key){var d;if(mode==null){mode="e"}if(!arguments.length){return _domain}if(classes!=null){d=chroma.analyze(domain,key);if(classes===0){domain=[d.min,d.max]}else{domain=chroma.limits(d,mode,classes)}}setDomain(domain);return f};f.mode=function(_m){if(!arguments.length){return _mode}_mode=_m;resetCache();return f};f.range=function(colors,_pos){setColors(colors,_pos);return f};f.out=function(_o){_out=_o;return f};f.spread=function(val){if(!arguments.length){return _spread}_spread=val;return f};f.correctLightness=function(v){if(!arguments.length){return _correctLightness}_correctLightness=v;resetCache();if(_correctLightness){tmap=function(t){var L0,L1,L_actual,L_diff,L_ideal,max_iter,pol,t0,t1;L0=getColor(0,true).lab()[0];L1=getColor(1,true).lab()[0];pol=L0>L1;L_actual=getColor(t,true).lab()[0];L_ideal=L0+(L1-L0)*t;L_diff=L_actual-L_ideal;t0=0;t1=1;max_iter=20;while(Math.abs(L_diff)>.01&&max_iter-->0){!function(){if(pol){L_diff*=-1}if(L_diff<0){t0=t;t+=(t1-t)*.5}else{t1=t;t+=(t0-t)*.5}L_actual=getColor(t,true).lab()[0];return L_diff=L_actual-L_ideal}()}return t}}else{tmap=function(t){return t}}return f};f.colors=function(out){var i,samples,_i,_j,_len,_ref;if(out==null){out="hex"}colors=[];samples=[];if(_domain.length>2){for(i=_i=1,_ref=_domain.length;1<=_ref?_i<_ref:_i>_ref;i=1<=_ref?++_i:--_i){samples.push((_domain[i-1]+_domain[i])*.5)}}else{samples=_domain}for(_j=0,_len=samples.length;_j<_len;_j++){i=samples[_j];colors.push(f(i)[out]())}return colors};return f};if((_ref=chroma.scales)==null){chroma.scales={}}chroma.scales.cool=function(){return chroma.scale([chroma.hsl(180,1,.9),chroma.hsl(250,.7,.4)])};chroma.scales.hot=function(){return chroma.scale(["#000","#f00","#ff0","#fff"],[0,.25,.75,1]).mode("rgb")};chroma.analyze=function(data,key,filter){var add,k,r,val,visit,_i,_len;r={min:Number.MAX_VALUE,max:Number.MAX_VALUE*-1,sum:0,values:[],count:0};if(filter==null){filter=function(){return true}}add=function(val){if(val!=null&&!isNaN(val)){r.values.push(val);r.sum+=val;if(val<r.min){r.min=val}if(val>r.max){r.max=val}r.count+=1}};visit=function(val,k){if(filter(val,k)){if(key!=null&&type(key)==="function"){return add(key(val))}else if(key!=null&&type(key)==="string"||type(key)==="number"){return add(val[key])}else{return add(val)}}};if(type(data)==="array"){for(_i=0,_len=data.length;_i<_len;_i++){val=data[_i];visit(val)}}else{for(k in data){val=data[k];visit(val,k)}}r.domain=[r.min,r.max];r.limits=function(mode,num){return chroma.limits(r,mode,num)};return r};chroma.limits=function(data,mode,num){var assignments,best,centroids,cluster,clusterSizes,dist,i,j,kClusters,limits,max,max_log,min,min_log,mindist,n,nb_iters,newCentroids,p,pb,pr,repeat,sum,tmpKMeansBreaks,value,values,_i,_j,_k,_l,_m,_n,_o,_p,_q,_r,_ref1,_ref10,_ref11,_ref12,_ref13,_ref14,_ref15,_ref2,_ref3,_ref4,_ref5,_ref6,_ref7,_ref8,_ref9,_s,_t,_u,_v,_w;if(mode==null){mode="equal"}if(num==null){num=7}if(type(data)==="array"){data=chroma.analyze(data)}min=data.min;max=data.max;sum=data.sum;values=data.values.sort(function(a,b){return a-b});limits=[];if(mode.substr(0,1)==="c"){limits.push(min);limits.push(max)}if(mode.substr(0,1)==="e"){limits.push(min);for(i=_i=1,_ref1=num-1;1<=_ref1?_i<=_ref1:_i>=_ref1;i=1<=_ref1?++_i:--_i){limits.push(min+i/num*(max-min))}limits.push(max)}else if(mode.substr(0,1)==="l"){if(min<=0){throw"Logarithmic scales are only possible for values > 0"}min_log=Math.LOG10E*Math.log(min);max_log=Math.LOG10E*Math.log(max);limits.push(min);for(i=_j=1,_ref2=num-1;1<=_ref2?_j<=_ref2:_j>=_ref2;i=1<=_ref2?++_j:--_j){limits.push(Math.pow(10,min_log+i/num*(max_log-min_log)))}limits.push(max)}else if(mode.substr(0,1)==="q"){limits.push(min);for(i=_k=1,_ref3=num-1;1<=_ref3?_k<=_ref3:_k>=_ref3;i=1<=_ref3?++_k:--_k){p=values.length*i/num;pb=Math.floor(p);if(pb===p){limits.push(values[pb])}else{pr=p-pb;limits.push(values[pb]*pr+values[pb+1]*(1-pr))}}limits.push(max)}else if(mode.substr(0,1)==="k"){n=values.length;assignments=new Array(n);clusterSizes=new Array(num);repeat=true;nb_iters=0;centroids=null;centroids=[];centroids.push(min);for(i=_l=1,_ref4=num-1;1<=_ref4?_l<=_ref4:_l>=_ref4;i=1<=_ref4?++_l:--_l){centroids.push(min+i/num*(max-min))}centroids.push(max);while(repeat){for(j=_m=0,_ref5=num-1;0<=_ref5?_m<=_ref5:_m>=_ref5;j=0<=_ref5?++_m:--_m){clusterSizes[j]=0}for(i=_n=0,_ref6=n-1;0<=_ref6?_n<=_ref6:_n>=_ref6;i=0<=_ref6?++_n:--_n){value=values[i];mindist=Number.MAX_VALUE;for(j=_o=0,_ref7=num-1;0<=_ref7?_o<=_ref7:_o>=_ref7;j=0<=_ref7?++_o:--_o){dist=Math.abs(centroids[j]-value);if(dist<mindist){mindist=dist;best=j}}clusterSizes[best]++;assignments[i]=best}newCentroids=new Array(num);for(j=_p=0,_ref8=num-1;0<=_ref8?_p<=_ref8:_p>=_ref8;j=0<=_ref8?++_p:--_p){newCentroids[j]=null}for(i=_q=0,_ref9=n-1;0<=_ref9?_q<=_ref9:_q>=_ref9;i=0<=_ref9?++_q:--_q){cluster=assignments[i];if(newCentroids[cluster]===null){newCentroids[cluster]=values[i]}else{newCentroids[cluster]+=values[i]}}for(j=_r=0,_ref10=num-1;0<=_ref10?_r<=_ref10:_r>=_ref10;j=0<=_ref10?++_r:--_r){newCentroids[j]*=1/clusterSizes[j]}repeat=false;for(j=_s=0,_ref11=num-1;0<=_ref11?_s<=_ref11:_s>=_ref11;j=0<=_ref11?++_s:--_s){if(newCentroids[j]!==centroids[i]){repeat=true;break}}centroids=newCentroids;nb_iters++;if(nb_iters>200){repeat=false}}kClusters={};for(j=_t=0,_ref12=num-1;0<=_ref12?_t<=_ref12:_t>=_ref12;j=0<=_ref12?++_t:--_t){kClusters[j]=[]}for(i=_u=0,_ref13=n-1;0<=_ref13?_u<=_ref13:_u>=_ref13;i=0<=_ref13?++_u:--_u){cluster=assignments[i];kClusters[cluster].push(values[i])}tmpKMeansBreaks=[];for(j=_v=0,_ref14=num-1;0<=_ref14?_v<=_ref14:_v>=_ref14;j=0<=_ref14?++_v:--_v){tmpKMeansBreaks.push(kClusters[j][0]);tmpKMeansBreaks.push(kClusters[j][kClusters[j].length-1])}tmpKMeansBreaks=tmpKMeansBreaks.sort(function(a,b){return a-b});limits.push(tmpKMeansBreaks[0]);for(i=_w=1,_ref15=tmpKMeansBreaks.length-1;_w<=_ref15;i=_w+=2){if(!isNaN(tmpKMeansBreaks[i])){limits.push(tmpKMeansBreaks[i])}}}return limits};/**
ColorBrewer colors for chroma.js
Copyright (c) 2002 Cynthia Brewer, Mark Harrower, and The
Pennsylvania State University.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed
under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied. See the License for the
specific language governing permissions and limitations under the License.
@preserve
*/
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classToType,name,_i,_len,_ref1;classToType={};_ref1="Boolean Number String Function Array Date RegExp Undefined Null".split(" ");for(_i=0,_len=_ref1.length;_i<_len;_i++){name=_ref1[_i];classToType["[object "+name+"]"]=name.toLowerCase()}return function(obj){var strType;strType=Object.prototype.toString.call(obj);return classToType[strType]||"object"}}();limit=function(x,min,max){if(min==null){min=0}if(max==null){max=1}if(x<min){x=min}if(x>max){x=max}return x};unpack=function(args){if(args.length>=3){return args}else{return args[0]}};TWOPI=Math.PI*2;PITHIRD=Math.PI/3;cos=Math.cos;bezier=function(colors){var I,I0,I1,c,lab0,lab1,lab2,lab3,_ref1,_ref2,_ref3;colors=function(){var _i,_len,_results;_results=[];for(_i=0,_len=colors.length;_i<_len;_i++){c=colors[_i];_results.push(chroma(c))}return _results}();if(colors.length===2){_ref1=function(){var _i,_len,_results;_results=[];for(_i=0,_len=colors.length;_i<_len;_i++){c=colors[_i];_results.push(c.lab())}return _results}(),lab0=_ref1[0],lab1=_ref1[1];I=function(t){var i,lab;lab=function(){var _i,_results;_results=[];for(i=_i=0;_i<=2;i=++_i){_results.push(lab0[i]+t*(lab1[i]-lab0[i]))}return _results}();return chroma.lab.apply(chroma,lab)}}else if(colors.length===3){_ref2=function(){var _i,_len,_results;_results=[];for(_i=0,_len=colors.length;_i<_len;_i++){c=colors[_i];_results.push(c.lab())}return _results}(),lab0=_ref2[0],lab1=_ref2[1],lab2=_ref2[2];I=function(t){var i,lab;lab=function(){var _i,_results;_results=[];for(i=_i=0;_i<=2;i=++_i){_results.push((1-t)*(1-t)*lab0[i]+2*(1-t)*t*lab1[i]+t*t*lab2[i])}return _results}();return chroma.lab.apply(chroma,lab)}}else if(colors.length===4){_ref3=function(){var _i,_len,_results;_results=[];for(_i=0,_len=colors.length;_i<_len;_i++){c=colors[_i];_results.push(c.lab())}return _results}(),lab0=_ref3[0],lab1=_ref3[1],lab2=_ref3[2],lab3=_ref3[3];I=function(t){var i,lab;lab=function(){var _i,_results;_results=[];for(i=_i=0;_i<=2;i=++_i){_results.push((1-t)*(1-t)*(1-t)*lab0[i]+3*(1-t)*(1-t)*t*lab1[i]+3*(1-t)*t*t*lab2[i]+t*t*t*lab3[i])}return _results}();return chroma.lab.apply(chroma,lab)}}else if(colors.length===5){I0=bezier(colors.slice(0,3));I1=bezier(colors.slice(2,5));I=function(t){if(t<.5){return I0(t*2)}else{return I1((t-.5)*2)}}}return I};chroma.interpolate.bezier=bezier}.call(this);
},{}],2:[function(require,module,exports){
/*!
* @license twgl.js 4.14.1 Copyright (c) 2015, Gregg Tavares All Rights Reserved.
* Available via the MIT license.
* see: http://github.com/greggman/twgl.js for details
*/
(function webpackUniversalModuleDefinition(root, factory) {
if(typeof exports === 'object' && typeof module === 'object')
module.exports = factory();
else if(typeof define === 'function' && define.amd)
define([], factory);
else if(typeof exports === 'object')
exports["twgl"] = factory();
else
root["twgl"] = factory();
})(typeof self !== 'undefined' ? self : this, function() {
return /******/ (function(modules) { // webpackBootstrap
/******/ // The module cache
/******/ var installedModules = {};
/******/
/******/ // The require function
/******/ function __webpack_require__(moduleId) {
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/******/ if(installedModules[moduleId]) {
/******/ return installedModules[moduleId].exports;
/******/ }
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/******/ var module = installedModules[moduleId] = {
/******/ i: moduleId,
/******/ l: false,
/******/ exports: {}
/******/ };
/******/
/******/ // Execute the module function
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/******/
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/******/ module.l = true;
/******/
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/***/ "./src/attributes.js":
/*!***************************!*\
!*** ./src/attributes.js ***!
\***************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {
"use strict";
exports.__esModule = true;
exports.createAttribsFromArrays = createAttribsFromArrays;
exports.createBuffersFromArrays = createBuffersFromArrays;
exports.createBufferFromArray = createBufferFromArray;
exports.createBufferFromTypedArray = createBufferFromTypedArray;
exports.createBufferInfoFromArrays = createBufferInfoFromArrays;
exports.setAttribInfoBufferFromArray = setAttribInfoBufferFromArray;
exports.setAttributePrefix = setAttributePrefix;
exports.setAttributeDefaults_ = setDefaults;
exports.getNumComponents_ = getNumComponents;
exports.getArray_ = getArray;
var typedArrays = _interopRequireWildcard(__webpack_require__(/*! ./typedarrays.js */ "./src/typedarrays.js"));
var helper = _interopRequireWildcard(__webpack_require__(/*! ./helper.js */ "./src/helper.js"));
function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function _getRequireWildcardCache() { return cache; }; return cache; }
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; if (obj != null) { var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
/*
* Copyright 2019 Gregg Tavares
*
* 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.
*/
var STATIC_DRAW = 0x88e4;
var ARRAY_BUFFER = 0x8892;
var ELEMENT_ARRAY_BUFFER = 0x8893;
var BUFFER_SIZE = 0x8764;
var BYTE = 0x1400;
var UNSIGNED_BYTE = 0x1401;
var SHORT = 0x1402;
var UNSIGNED_SHORT = 0x1403;
var INT = 0x1404;
var UNSIGNED_INT = 0x1405;
var FLOAT = 0x1406;
/**
* Low level attribute and buffer related functions
*
* You should generally not need to use these functions. They are provided
* for those cases where you're doing something out of the ordinary
* and you need lower level access.
*
* For backward compatibility they are available at both `twgl.attributes` and `twgl`
* itself
*
* See {@link module:twgl} for core functions
*
* @module twgl/attributes
*/
// make sure we don't see a global gl
var gl = undefined;
/* eslint-disable-line */
/* lgtm [js/unused-local-variable] */
var defaults = {
attribPrefix: ""
};
/**
* Sets the default attrib prefix
*
* When writing shaders I prefer to name attributes with `a_`, uniforms with `u_` and varyings with `v_`
* as it makes it clear where they came from. But, when building geometry I prefer using un-prefixed names.
*
* In other words I'll create arrays of geometry like this
*
* var arrays = {
* position: ...
* normal: ...
* texcoord: ...
* };
*
* But need those mapped to attributes and my attributes start with `a_`.
*
* @deprecated see {@link module:twgl.setDefaults}
* @param {string} prefix prefix for attribs
* @memberOf module:twgl/attributes
*/
function setAttributePrefix(prefix) {
defaults.attribPrefix = prefix;
}
function setDefaults(newDefaults) {
helper.copyExistingProperties(newDefaults, defaults);
}
function setBufferFromTypedArray(gl, type, buffer, array, drawType) {
gl.bindBuffer(type, buffer);
gl.bufferData(type, array, drawType || STATIC_DRAW);
}
/**
* Given typed array creates a WebGLBuffer and copies the typed array
* into it.
*
* @param {WebGLRenderingContext} gl A WebGLRenderingContext
* @param {ArrayBuffer|SharedArrayBuffer|ArrayBufferView|WebGLBuffer} typedArray the typed array. Note: If a WebGLBuffer is passed in it will just be returned. No action will be taken
* @param {number} [type] the GL bind type for the buffer. Default = `gl.ARRAY_BUFFER`.
* @param {number} [drawType] the GL draw type for the buffer. Default = 'gl.STATIC_DRAW`.
* @return {WebGLBuffer} the created WebGLBuffer
* @memberOf module:twgl/attributes
*/
function createBufferFromTypedArray(gl, typedArray, type, drawType) {
if (helper.isBuffer(gl, typedArray)) {
return typedArray;
}
type = type || ARRAY_BUFFER;
var buffer = gl.createBuffer();
setBufferFromTypedArray(gl, type, buffer, typedArray, drawType);
return buffer;
}
function isIndices(name) {
return name === "indices";
} // This is really just a guess. Though I can't really imagine using
// anything else? Maybe for some compression?
function getNormalizationForTypedArray(typedArray) {
if (typedArray instanceof Int8Array) {
return true;
} // eslint-disable-line
if (typedArray instanceof Uint8Array) {
return true;
} // eslint-disable-line
return false;
} // This is really just a guess. Though I can't really imagine using
// anything else? Maybe for some compression?
function getNormalizationForTypedArrayType(typedArrayType) {
if (typedArrayType === Int8Array) {
return true;
} // eslint-disable-line
if (typedArrayType === Uint8Array) {
return true;
} // eslint-disable-line
return false;
}
function getArray(array) {
return array.length ? array : array.data;
}
var texcoordRE = /coord|texture/i;
var colorRE = /color|colour/i;
function guessNumComponentsFromName(name, length) {
var numComponents;
if (texcoordRE.test(name)) {
numComponents = 2;
} else if (colorRE.test(name)) {
numComponents = 4;
} else {
numComponents = 3; // position, normals, indices ...
}
if (length % numComponents > 0) {
throw new Error("Can not guess numComponents for attribute '".concat(name, "'. Tried ").concat(numComponents, " but ").concat(length, " values is not evenly divisible by ").concat(numComponents, ". You should specify it."));
}
return numComponents;
}
function getNumComponents(array, arrayName) {
return array.numComponents || array.size || guessNumComponentsFromName(arrayName, getArray(array).length);
}
function makeTypedArray(array, name) {
if (typedArrays.isArrayBuffer(array)) {
return array;
}
if (typedArrays.isArrayBuffer(array.data)) {
return array.data;
}
if (Array.isArray(array)) {
array = {
data: array
};
}
var Type = array.type;
if (!Type) {
if (isIndices(name)) {
Type = Uint16Array;
} else {
Type = Float32Array;
}
}
return new Type(array.data);
}
/**
* The info for an attribute. This is effectively just the arguments to `gl.vertexAttribPointer` plus the WebGLBuffer
* for the attribute.
*
* @typedef {Object} AttribInfo
* @property {number[]|ArrayBufferView} [value] a constant value for the attribute. Note: if this is set the attribute will be
* disabled and set to this constant value and all other values will be ignored.
* @property {number} [numComponents] the number of components for this attribute.
* @property {number} [size] synonym for `numComponents`.
* @property {number} [type] the type of the attribute (eg. `gl.FLOAT`, `gl.UNSIGNED_BYTE`, etc...) Default = `gl.FLOAT`
* @property {boolean} [normalize] whether or not to normalize the data. Default = false
* @property {number} [offset] offset into buffer in bytes. Default = 0
* @property {number} [stride] the stride in bytes per element. Default = 0
* @property {number} [divisor] the divisor in instances. Default = undefined. Note: undefined = don't call gl.vertexAttribDivisor
* where as anything else = do call it with this value
* @property {WebGLBuffer} buffer the buffer that contains the data for this attribute
* @property {number} [drawType] the draw type passed to gl.bufferData. Default = gl.STATIC_DRAW
* @memberOf module:twgl
*/
/**
* Use this type of array spec when TWGL can't guess the type or number of components of an array
* @typedef {Object} FullArraySpec
* @property {number[]|ArrayBufferView} [value] a constant value for the attribute. Note: if this is set the attribute will be
* disabled and set to this constant value and all other values will be ignored.
* @property {(number|number[]|ArrayBufferView)} data The data of the array. A number alone becomes the number of elements of type.
* @property {number} [numComponents] number of components for `vertexAttribPointer`. Default is based on the name of the array.
* If `coord` is in the name assumes `numComponents = 2`.
* If `color` is in the name assumes `numComponents = 4`.
* otherwise assumes `numComponents = 3`
* @property {constructor} [type] type. This is only used if `data` is a JavaScript array. It is the constructor for the typedarray. (eg. `Uint8Array`).
* For example if you want colors in a `Uint8Array` you might have a `FullArraySpec` like `{ type: Uint8Array, data: [255,0,255,255, ...], }`.
* @property {number} [size] synonym for `numComponents`.
* @property {boolean} [normalize] normalize for `vertexAttribPointer`. Default is true if type is `Int8Array` or `Uint8Array` otherwise false.
* @property {number} [stride] stride for `vertexAttribPointer`. Default = 0
* @property {number} [offset] offset for `vertexAttribPointer`. Default = 0
* @property {number} [divisor] divisor for `vertexAttribDivisor`. Default = undefined. Note: undefined = don't call gl.vertexAttribDivisor
* where as anything else = do call it with this value
* @property {string} [attrib] name of attribute this array maps to. Defaults to same name as array prefixed by the default attribPrefix.
* @property {string} [name] synonym for `attrib`.
* @property {string} [attribName] synonym for `attrib`.
* @property {WebGLBuffer} [buffer] Buffer to use for this attribute. This lets you use your own buffer
* but you will need to supply `numComponents` and `type`. You can effectively pass an `AttribInfo`
* to provide this. Example:
*
* const bufferInfo1 = twgl.createBufferInfoFromArrays(gl, {
* position: [1, 2, 3, ... ],
* });
* const bufferInfo2 = twgl.createBufferInfoFromArrays(gl, {
* position: bufferInfo1.attribs.position, // use the same buffer from bufferInfo1
* });
*
* @memberOf module:twgl
*/
/**
* An individual array in {@link module:twgl.Arrays}
*
* When passed to {@link module:twgl.createBufferInfoFromArrays} if an ArraySpec is `number[]` or `ArrayBufferView`
* the types will be guessed based on the name. `indices` will be `Uint16Array`, everything else will
* be `Float32Array`. If an ArraySpec is a number it's the number of floats for an empty (zeroed) buffer.
*
* @typedef {(number|number[]|ArrayBufferView|module:twgl.FullArraySpec)} ArraySpec
* @memberOf module:twgl
*/
/**
* This is a JavaScript object of arrays by name. The names should match your shader's attributes. If your
* attributes have a common prefix you can specify it by calling {@link module:twgl.setAttributePrefix}.
*
* Bare JavaScript Arrays
*
* var arrays = {
* position: [-1, 1, 0],
* normal: [0, 1, 0],
* ...
* }
*
* Bare TypedArrays
*
* var arrays = {
* position: new Float32Array([-1, 1, 0]),
* color: new Uint8Array([255, 128, 64, 255]),
* ...
* }
*
* * Will guess at `numComponents` if not specified based on name.
*
* If `coord` is in the name assumes `numComponents = 2`
*
* If `color` is in the name assumes `numComponents = 4`
*
* otherwise assumes `numComponents = 3`
*
* Objects with various fields. See {@link module:twgl.FullArraySpec}.
*
* var arrays = {
* position: { numComponents: 3, data: [0, 0, 0, 10, 0, 0, 0, 10, 0, 10, 10, 0], },
* texcoord: { numComponents: 2, data: [0, 0, 0, 1, 1, 0, 1, 1], },
* normal: { numComponents: 3, data: [0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1], },
* indices: { numComponents: 3, data: [0, 1, 2, 1, 2, 3], },
* };
*
* @typedef {Object.<string, module:twgl.ArraySpec>} Arrays
* @memberOf module:twgl
*/
/**
* Creates a set of attribute data and WebGLBuffers from set of arrays
*
* Given
*
* var arrays = {
* position: { numComponents: 3, data: [0, 0, 0, 10, 0, 0, 0, 10, 0, 10, 10, 0], },
* texcoord: { numComponents: 2, data: [0, 0, 0, 1, 1, 0, 1, 1], },
* normal: { numComponents: 3, data: [0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1], },
* color: { numComponents: 4, data: [255, 255, 255, 255, 255, 0, 0, 255, 0, 0, 255, 255], type: Uint8Array, },
* indices: { numComponents: 3, data: [0, 1, 2, 1, 2, 3], },
* };
*
* returns something like
*
* var attribs = {
* position: { numComponents: 3, type: gl.FLOAT, normalize: false, buffer: WebGLBuffer, },
* texcoord: { numComponents: 2, type: gl.FLOAT, normalize: false, buffer: WebGLBuffer, },
* normal: { numComponents: 3, type: gl.FLOAT, normalize: false, buffer: WebGLBuffer, },
* color: { numComponents: 4, type: gl.UNSIGNED_BYTE, normalize: true, buffer: WebGLBuffer, },
* };
*
* notes:
*
* * Arrays can take various forms
*
* Bare JavaScript Arrays
*
* var arrays = {
* position: [-1, 1, 0],
* normal: [0, 1, 0],
* ...
* }
*
* Bare TypedArrays
*
* var arrays = {
* position: new Float32Array([-1, 1, 0]),
* color: new Uint8Array([255, 128, 64, 255]),
* ...
* }
*
* * Will guess at `numComponents` if not specified based on name.
*
* If `coord` is in the name assumes `numComponents = 2`
*
* If `color` is in the name assumes `numComponents = 4`
*
* otherwise assumes `numComponents = 3`
*
* @param {WebGLRenderingContext} gl The webgl rendering context.
* @param {module:twgl.Arrays} arrays The arrays
* @param {module:twgl.BufferInfo} [srcBufferInfo] a BufferInfo to copy from
* This lets you share buffers. Any arrays you supply will override
* the buffers from srcBufferInfo.
* @return {Object.<string, module:twgl.AttribInfo>} the attribs
* @memberOf module:twgl/attributes
*/
function createAttribsFromArrays(gl, arrays) {
var attribs = {};
Object.keys(arrays).forEach(function (arrayName) {
if (!isIndices(arrayName)) {
var array = arrays[arrayName];
var attribName = array.attrib || array.name || array.attribName || defaults.attribPrefix + arrayName;
if (array.value) {
if (!Array.isArray(array.value) && !typedArrays.isArrayBuffer(array.value)) {
throw new Error('array.value is not array or typedarray');
}
attribs[attribName] = {
value: array.value
};
} else {
var buffer;
var type;
var normalization;
var numComponents;
if (array.buffer && array.buffer instanceof WebGLBuffer) {
buffer = array.buffer;
numComponents = array.numComponents || array.size;
type = array.type;
normalization = array.normalize;
} else if (typeof array === "number" || typeof array.data === "number") {
var numValues = array.data || array;
var arrayType = array.type || Float32Array;
var numBytes = numValues * arrayType.BYTES_PER_ELEMENT;
type = typedArrays.getGLTypeForTypedArrayType(arrayType);
normalization = array.normalize !== undefined ? array.normalize : getNormalizationForTypedArrayType(arrayType);
numComponents = array.numComponents || array.size || guessNumComponentsFromName(arrayName, numValues);
buffer = gl.createBuffer();
gl.bindBuffer(ARRAY_BUFFER, buffer);
gl.bufferData(ARRAY_BUFFER, numBytes, array.drawType || STATIC_DRAW);
} else {
var typedArray = makeTypedArray(array, arrayName);
buffer = createBufferFromTypedArray(gl, typedArray, undefined, array.drawType);
type = typedArrays.getGLTypeForTypedArray(typedArray);
normalization = array.normalize !== undefined ? array.normalize : getNormalizationForTypedArray(typedArray);
numComponents = getNumComponents(array, arrayName);
}
attribs[attribName] = {
buffer: buffer,
numComponents: numComponents,
type: type,
normalize: normalization,
stride: array.stride || 0,
offset: array.offset || 0,
divisor: array.divisor === undefined ? undefined : array.divisor,
drawType: array.drawType
};
}
}
});
gl.bindBuffer(ARRAY_BUFFER, null);
return attribs;
}
/**
* Sets the contents of a buffer attached to an attribInfo
*
* This is helper function to dynamically update a buffer.
*
* Let's say you make a bufferInfo
*
* var arrays = {
* position: new Float32Array([0, 0, 0, 10, 0, 0, 0, 10, 0, 10, 10, 0]),
* texcoord: new Float32Array([0, 0, 0, 1, 1, 0, 1, 1]),
* normal: new Float32Array([0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1]),
* indices: new Uint16Array([0, 1, 2, 1, 2, 3]),
* };
* var bufferInfo = twgl.createBufferInfoFromArrays(gl, arrays);
*
* And you want to dynamically update the positions. You could do this
*
* // assuming arrays.position has already been updated with new data.
* twgl.setAttribInfoBufferFromArray(gl, bufferInfo.attribs.position, arrays.position);
*
* @param {WebGLRenderingContext} gl
* @param {AttribInfo} attribInfo The attribInfo who's buffer contents to set. NOTE: If you have an attribute prefix
* the name of the attribute will include the prefix.
* @param {ArraySpec} array Note: it is arguably inefficient to pass in anything but a typed array because anything
* else will have to be converted to a typed array before it can be used by WebGL. During init time that
* inefficiency is usually not important but if you're updating data dynamically best to be efficient.
* @param {number} [offset] an optional offset into the buffer. This is only an offset into the WebGL buffer
* not the array. To pass in an offset into the array itself use a typed array and create an `ArrayBufferView`
* for the portion of the array you want to use.
*
* var someArray = new Float32Array(1000); // an array with 1000 floats
* var someSubArray = new Float32Array(someArray.buffer, offsetInBytes, sizeInUnits); // a view into someArray
*
* Now you can pass `someSubArray` into setAttribInfoBufferFromArray`
* @memberOf module:twgl/attributes
*/
function setAttribInfoBufferFromArray(gl, attribInfo, array, offset) {
array = makeTypedArray(array);
if (offset !== undefined) {
gl.bindBuffer(ARRAY_BUFFER, attribInfo.buffer);
gl.bufferSubData(ARRAY_BUFFER, offset, array);
} else {
setBufferFromTypedArray(gl, ARRAY_BUFFER, attribInfo.buffer, array, attribInfo.drawType);
}
}
function getBytesPerValueForGLType(gl, type) {
if (type === BYTE) return 1; // eslint-disable-line
if (type === UNSIGNED_BYTE) return 1; // eslint-disable-line
if (type === SHORT) return 2; // eslint-disable-line
if (type === UNSIGNED_SHORT) return 2; // eslint-disable-line
if (type === INT) return 4; // eslint-disable-line
if (type === UNSIGNED_INT) return 4; // eslint-disable-line
if (type === FLOAT) return 4; // eslint-disable-line
return 0;
} // Tries to get the number of elements from a set of arrays.
var positionKeys = ['position', 'positions', 'a_position'];
function getNumElementsFromNonIndexedArrays(arrays) {
var key;
var ii;
for (ii = 0; ii < positionKeys.length; ++ii) {
key = positionKeys[ii];
if (key in arrays) {
break;
}
}
if (ii === positionKeys.length) {
key = Object.keys(arrays)[0];
}
var array = arrays[key];
var length = getArray(array).length;
var numComponents = getNumComponents(array, key);
var numElements = length / numComponents;
if (length % numComponents > 0) {
throw new Error("numComponents ".concat(numComponents, " not correct for length ").concat(length));
}
return numElements;
}
function getNumElementsFromAttributes(gl, attribs) {
var key;
var ii;
for (ii = 0; ii < positionKeys.length; ++ii) {
key = positionKeys[ii];
if (key in attribs) {
break;
}
key = defaults.attribPrefix + key;
if (key in attribs) {
break;
}
}
if (ii === positionKeys.length) {
key = Object.keys(attribs)[0];
}
var attrib = attribs[key];
gl.bindBuffer(ARRAY_BUFFER, attrib.buffer);
var numBytes = gl.getBufferParameter(ARRAY_BUFFER, BUFFER_SIZE);
gl.bindBuffer(ARRAY_BUFFER, null);
var bytesPerValue = getBytesPerValueForGLType(gl, attrib.type);
var totalElements = numBytes / bytesPerValue;
var numComponents = attrib.numComponents || attrib.size; // TODO: check stride
var numElements = totalElements / numComponents;
if (numElements % 1 !== 0) {
throw new Error("numComponents ".concat(numComponents, " not correct for length ").concat(length));
}
return numElements;
}
/**
* @typedef {Object} BufferInfo
* @property {number} numElements The number of elements to pass to `gl.drawArrays` or `gl.drawElements`.
* @property {number} [elementType] The type of indices `UNSIGNED_BYTE`, `UNSIGNED_SHORT` etc..
* @property {WebGLBuffer} [indices] The indices `ELEMENT_ARRAY_BUFFER` if any indices exist.
* @property {Object.<string, module:twgl.AttribInfo>} [attribs] The attribs appropriate to call `setAttributes`
* @memberOf module:twgl
*/
/**
* Creates a BufferInfo from an object of arrays.
*
* This can be passed to {@link module:twgl.setBuffersAndAttributes} and to
* {@link module:twgl:drawBufferInfo}.
*
* Given an object like
*
* var arrays = {
* position: { numComponents: 3, data: [0, 0, 0, 10, 0, 0, 0, 10, 0, 10, 10, 0], },
* texcoord: { numComponents: 2, data: [0, 0, 0, 1, 1, 0, 1, 1], },
* normal: { numComponents: 3, data: [0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1], },
* indices: { numComponents: 3, data: [0, 1, 2, 1, 2, 3], },
* };
*
* Creates an BufferInfo like this
*
* bufferInfo = {
* numElements: 4, // or whatever the number of elements is
* indices: WebGLBuffer, // this property will not exist if there are no indices
* attribs: {
* position: { buffer: WebGLBuffer, numComponents: 3, },
* normal: { buffer: WebGLBuffer, numComponents: 3, },
* texcoord: { buffer: WebGLBuffer, numComponents: 2, },
* },
* };
*
* The properties of arrays can be JavaScript arrays in which case the number of components
* will be guessed.
*
* var arrays = {
* position: [0, 0, 0, 10, 0, 0, 0, 10, 0, 10, 10, 0],
* texcoord: [0, 0, 0, 1, 1, 0, 1, 1],
* normal: [0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1],
* indices: [0, 1, 2, 1, 2, 3],
* };
*
* They can also be TypedArrays
*
* var arrays = {
* position: new Float32Array([0, 0, 0, 10, 0, 0, 0, 10, 0, 10, 10, 0]),
* texcoord: new Float32Array([0, 0, 0, 1, 1, 0, 1, 1]),
* normal: new Float32Array([0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1]),
* indices: new Uint16Array([0, 1, 2, 1, 2, 3]),
* };
*
* Or AugmentedTypedArrays
*
* var positions = createAugmentedTypedArray(3, 4);
* var texcoords = createAugmentedTypedArray(2, 4);
* var normals = createAugmentedTypedArray(3, 4);
* var indices = createAugmentedTypedArray(3, 2, Uint16Array);
*
* positions.push([0, 0, 0, 10, 0, 0, 0, 10, 0, 10, 10, 0]);
* texcoords.push([0, 0, 0, 1, 1, 0, 1, 1]);
* normals.push([0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1]);
* indices.push([0, 1, 2, 1, 2, 3]);
*
* var arrays = {
* position: positions,
* texcoord: texcoords,
* normal: normals,
* indices: indices,
* };
*
* For the last example it is equivalent to
*
* var bufferInfo = {
* attribs: {
* position: { numComponents: 3, buffer: gl.createBuffer(), },
* texcoord: { numComponents: 2, buffer: gl.createBuffer(), },
* normal: { numComponents: 3, buffer: gl.createBuffer(), },
* },
* indices: gl.createBuffer(),
* numElements: 6,
* };
*
* gl.bindBuffer(gl.ARRAY_BUFFER, bufferInfo.attribs.position.buffer);
* gl.bufferData(gl.ARRAY_BUFFER, arrays.position, gl.STATIC_DRAW);
* gl.bindBuffer(gl.ARRAY_BUFFER, bufferInfo.attribs.texcoord.buffer);
* gl.bufferData(gl.ARRAY_BUFFER, arrays.texcoord, gl.STATIC_DRAW);
* gl.bindBuffer(gl.ARRAY_BUFFER, bufferInfo.attribs.normal.buffer);
* gl.bufferData(gl.ARRAY_BUFFER, arrays.normal, gl.STATIC_DRAW);
* gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, bufferInfo.indices);
* gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, arrays.indices, gl.STATIC_DRAW);
*
* @param {WebGLRenderingContext} gl A WebGLRenderingContext
* @param {module:twgl.Arrays} arrays Your data
* @param {module:twgl.BufferInfo} [srcBufferInfo] An existing
* buffer info to start from. WebGLBuffers etc specified
* in the srcBufferInfo will be used in a new BufferInfo
* with any arrays specified overriding the ones in
* srcBufferInfo.
* @return {module:twgl.BufferInfo} A BufferInfo
* @memberOf module:twgl/attributes
*/
function createBufferInfoFromArrays(gl, arrays, srcBufferInfo) {
var newAttribs = createAttribsFromArrays(gl, arrays);
var bufferInfo = Object.assign({}, srcBufferInfo ? srcBufferInfo : {});
bufferInfo.attribs = Object.assign({}, srcBufferInfo ? srcBufferInfo.attribs : {}, newAttribs);
var indices = arrays.indices;
if (indices) {
var newIndices = makeTypedArray(indices, "indices");
bufferInfo.indices = createBufferFromTypedArray(gl, newIndices, ELEMENT_ARRAY_BUFFER);
bufferInfo.numElements = newIndices.length;
bufferInfo.elementType = typedArrays.getGLTypeForTypedArray(newIndices);
} else if (!bufferInfo.numElements) {
bufferInfo.numElements = getNumElementsFromAttributes(gl, bufferInfo.attribs);
}
return bufferInfo;
}
/**
* Creates a buffer from an array, typed array, or array spec
*
* Given something like this
*
* [1, 2, 3],
*
* or
*
* new Uint16Array([1,2,3]);
*
* or
*
* {
* data: [1, 2, 3],
* type: Uint8Array,
* }
*
* returns a WebGLBuffer that contains the given data.
*
* @param {WebGLRenderingContext} gl A WebGLRenderingContext.
* @param {module:twgl.ArraySpec} array an array, typed array, or array spec.
* @param {string} arrayName name of array. Used to guess the type if type can not be derived otherwise.
* @return {WebGLBuffer} a WebGLBuffer containing the data in array.
* @memberOf module:twgl/attributes
*/
function createBufferFromArray(gl, array, arrayName) {
var type = arrayName === "indices" ? ELEMENT_ARRAY_BUFFER : ARRAY_BUFFER;
var typedArray = makeTypedArray(array, arrayName);
return createBufferFromTypedArray(gl, typedArray, type);
}
/**
* Creates buffers from arrays or typed arrays
*
* Given something like this
*
* var arrays = {
* positions: [1, 2, 3],
* normals: [0, 0, 1],
* }
*
* returns something like
*
* buffers = {
* positions: WebGLBuffer,
* normals: WebGLBuffer,
* }
*
* If the buffer is named 'indices' it will be made an ELEMENT_ARRAY_BUFFER.
*
* @param {WebGLRenderingContext} gl A WebGLRenderingContext.
* @param {module:twgl.Arrays} arrays
* @return {Object<string, WebGLBuffer>} returns an object with one WebGLBuffer per array
* @memberOf module:twgl/attributes
*/
function createBuffersFromArrays(gl, arrays) {
var buffers = {};
Object.keys(arrays).forEach(function (key) {
buffers[key] = createBufferFromArray(gl, arrays[key], key);
}); // Ugh!
if (arrays.indices) {
buffers.numElements = arrays.indices.length;
buffers.elementType = typedArrays.getGLTypeForTypedArray(makeTypedArray(arrays.indices), 'indices');
} else {
buffers.numElements = getNumElementsFromNonIndexedArrays(arrays);
}
return buffers;
}
/***/ }),
/***/ "./src/draw.js":
/*!*********************!*\
!*** ./src/draw.js ***!
\*********************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {
"use strict";
exports.__esModule = true;
exports.drawBufferInfo = drawBufferInfo;
exports.drawObjectList = drawObjectList;
var programs = _interopRequireWildcard(__webpack_require__(/*! ./programs.js */ "./src/programs.js"));
function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function _getRequireWildcardCache() { return cache; }; return cache; }
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; if (obj != null) { var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
/*
* Copyright 2019 Gregg Tavares
*
* 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.
*/
var TRIANGLES = 0x0004;
var UNSIGNED_SHORT = 0x1403;
/**
* Drawing related functions
*
* For backward compatibility they are available at both `twgl.draw` and `twgl`
* itself
*
* See {@link module:twgl} for core functions
*
* @module twgl/draw
*/
/**
* Calls `gl.drawElements` or `gl.drawArrays`, whichever is appropriate
*
* normally you'd call `gl.drawElements` or `gl.drawArrays` yourself
* but calling this means if you switch from indexed data to non-indexed
* data you don't have to remember to update your draw call.
*
* @param {WebGLRenderingContext} gl A WebGLRenderingContext
* @param {(module:twgl.BufferInfo|module:twgl.VertexArrayInfo)} bufferInfo A BufferInfo as returned from {@link module:twgl.createBufferInfoFromArrays} or
* a VertexArrayInfo as returned from {@link module:twgl.createVertexArrayInfo}
* @param {number} [type] eg (gl.TRIANGLES, gl.LINES, gl.POINTS, gl.TRIANGLE_STRIP, ...). Defaults to `gl.TRIANGLES`
* @param {number} [count] An optional count. Defaults to bufferInfo.numElements
* @param {number} [offset] An optional offset. Defaults to 0.
* @param {number} [instanceCount] An optional instanceCount. if set then `drawArraysInstanced` or `drawElementsInstanced` will be called
* @memberOf module:twgl/draw
*/
function drawBufferInfo(gl, bufferInfo, type, count, offset, instanceCount) {
type = type === undefined ? TRIANGLES : type;
var indices = bufferInfo.indices;
var elementType = bufferInfo.elementType;