Web GL font - with Signed Distance Fields: http://bl.ocks.org/klokan/raw/9ba0fd74e9c77db4c3540cf2b1c95dba/ and blog https://www.mapbox.com/blog/text-signed-distance-fields/

domready.js

/*!
  * domready (c) Dustin Diaz 2012 - License MIT
  */
!function (name, context, definition) {
  if (typeof module != 'undefined') module.exports = definition()
  else if (typeof define == 'function' && typeof define.amd == 'object') define(definition)
  else context[name] = definition()
}('domready', this, function (ready) {

  var fns = [], fn, f = false
    , doc = document
    , testEl = doc.documentElement
    , hack = testEl.doScroll
    , domContentLoaded = 'DOMContentLoaded'
    , addEventListener = 'addEventListener'
    , onreadystatechange = 'onreadystatechange'
    , readyState = 'readyState'
    , loaded = /^loade|c/.test(doc[readyState])

  function flush(f) {
    loaded = 1
    while (f = fns.shift()) f()
  }

  doc[addEventListener] && doc[addEventListener](domContentLoaded, fn = function () {
    doc.removeEventListener(domContentLoaded, fn, f)
    flush()
  }, f)


  hack && doc.attachEvent(onreadystatechange, fn = function () {
    if (/^c/.test(doc[readyState])) {
      doc.detachEvent(onreadystatechange, fn)
      flush()
    }
  })

  return (ready = hack ?
    function (fn) {
      self != top ?
        loaded ? fn() : fns.push(fn) :
        function () {
          try {
            testEl.doScroll('left')
          } catch (e) {
            return setTimeout(function() { ready(fn) }, 50)
          }
          fn()
        }()
    } :
    function (fn) {
      loaded ? fn() : fns.push(fn)
    })
})

glmatrix.js

/**
 * @fileoverview gl-matrix - High performance matrix and vector operations
 * @author Brandon Jones
 * @author Colin MacKenzie IV
 * @version 2.2.0
 */
/* Copyright (c) 2013, Brandon Jones, Colin MacKenzie IV. All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this
    list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation 
    and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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n=t[0],r=t[1],i=t[2],s=t[3],o=t[4],u=t[5],a=n*s-r*i;return a?(a=1/a,e[0]=s*a,e[1]=-r*a,e[2]=-i*a,e[3]=n*a,e[4]=(i*u-s*o)*a,e[5]=(r*o-n*u)*a,e):null},f.determinant=function(e){return e[0]*e[3]-e[1]*e[2]},f.multiply=function(e,t,n){var r=t[0],i=t[1],s=t[2],o=t[3],u=t[4],a=t[5],f=n[0],l=n[1],c=n[2],h=n[3],p=n[4],d=n[5];return e[0]=r*f+i*c,e[1]=r*l+i*h,e[2]=s*f+o*c,e[3]=s*l+o*h,e[4]=f*u+c*a+p,e[5]=l*u+h*a+d,e},f.mul=f.multiply,f.rotate=function(e,t,n){var r=t[0],i=t[1],s=t[2],o=t[3],u=t[4],a=t[5],f=Math.sin(n),l=Math.cos(n);return e[0]=r*l+i*f,e[1]=-r*f+i*l,e[2]=s*l+o*f,e[3]=-s*f+l*o,e[4]=l*u+f*a,e[5]=l*a-f*u,e},f.scale=function(e,t,n){var r=n[0],i=n[1];return e[0]=t[0]*r,e[1]=t[1]*i,e[2]=t[2]*r,e[3]=t[3]*i,e[4]=t[4]*r,e[5]=t[5]*i,e},f.translate=function(e,t,n){return e[0]=t[0],e[1]=t[1],e[2]=t[2],e[3]=t[3],e[4]=t[4]+n[0],e[5]=t[5]+n[1],e},f.str=function(e){return"mat2d("+e[0]+", "+e[1]+", "+e[2]+", "+e[3]+", "+e[4]+", "+e[5]+")"},typeof e!="undefined"&&(e.mat2d=f);var l={};l.create=function(){var e=new n(9);return e[0]=1,e[1]=0,e[2]=0,e[3]=0,e[4]=1,e[5]=0,e[6]=0,e[7]=0,e[8]=1,e},l.fromMat4=function(e,t){return e[0]=t[0],e[1]=t[1],e[2]=t[2],e[3]=t[4],e[4]=t[5],e[5]=t[6],e[6]=t[8],e[7]=t[9],e[8]=t[10],e},l.clone=function(e){var t=new n(9);return t[0]=e[0],t[1]=e[1],t[2]=e[2],t[3]=e[3],t[4]=e[4],t[5]=e[5],t[6]=e[6],t[7]=e[7],t[8]=e[8],t},l.copy=function(e,t){return e[0]=t[0],e[1]=t[1],e[2]=t[2],e[3]=t[3],e[4]=t[4],e[5]=t[5],e[6]=t[6],e[7]=t[7],e[8]=t[8],e},l.identity=function(e){return e[0]=1,e[1]=0,e[2]=0,e[3]=0,e[4]=1,e[5]=0,e[6]=0,e[7]=0,e[8]=1,e},l.transpose=function(e,t){if(e===t){var n=t[1],r=t[2],i=t[5];e[1]=t[3],e[2]=t[6],e[3]=n,e[5]=t[7],e[6]=r,e[7]=i}else e[0]=t[0],e[1]=t[3],e[2]=t[6],e[3]=t[1],e[4]=t[4],e[5]=t[7],e[6]=t[2],e[7]=t[5],e[8]=t[8];return e},l.invert=function(e,t){var n=t[0],r=t[1],i=t[2],s=t[3],o=t[4],u=t[5],a=t[6],f=t[7],l=t[8],c=l*o-u*f,h=-l*s+u*a,p=f*s-o*a,d=n*c+r*h+i*p;return d?(d=1/d,e[0]=c*d,e[1]=(-l*r+i*f)*d,e[2]=(u*r-i*o)*d,e[3]=h*d,e[4]=(l*n-i*a)*d,e[5]=(-u*n+i*s)*d,e[6]=p*d,e[7]=(-f*n+r*a)*d,e[8]=(o*n-r*s)*d,e):null},l.adjoint=function(e,t){var n=t[0],r=t[1],i=t[2],s=t[3],o=t[4],u=t[5],a=t[6],f=t[7],l=t[8];return e[0]=o*l-u*f,e[1]=i*f-r*l,e[2]=r*u-i*o,e[3]=u*a-s*l,e[4]=n*l-i*a,e[5]=i*s-n*u,e[6]=s*f-o*a,e[7]=r*a-n*f,e[8]=n*o-r*s,e},l.determinant=function(e){var t=e[0],n=e[1],r=e[2],i=e[3],s=e[4],o=e[5],u=e[6],a=e[7],f=e[8];return t*(f*s-o*a)+n*(-f*i+o*u)+r*(a*i-s*u)},l.multiply=function(e,t,n){var r=t[0],i=t[1],s=t[2],o=t[3],u=t[4],a=t[5],f=t[6],l=t[7],c=t[8],h=n[0],p=n[1],d=n[2],v=n[3],m=n[4],g=n[5],y=n[6],b=n[7],w=n[8];return e[0]=h*r+p*o+d*f,e[1]=h*i+p*u+d*l,e[2]=h*s+p*a+d*c,e[3]=v*r+m*o+g*f,e[4]=v*i+m*u+g*l,e[5]=v*s+m*a+g*c,e[6]=y*r+b*o+w*f,e[7]=y*i+b*u+w*l,e[8]=y*s+b*a+w*c,e},l.mul=l.multiply,l.translate=function(e,t,n){var r=t[0],i=t[1],s=t[2],o=t[3],u=t[4],a=t[5],f=t[6],l=t[7],c=t[8],h=n[0],p=n[1];return e[0]=r,e[1]=i,e[2]=s,e[3]=o,e[4]=u,e[5]=a,e[6]=h*r+p*o+f,e[7]=h*i+p*u+l,e[8]=h*s+p*a+c,e},l.rotate=function(e,t,n){var r=t[0],i=t[1],s=t[2],o=t[3],u=t[4],a=t[5],f=t[6],l=t[7],c=t[8],h=Math.sin(n),p=Math.cos(n);return e[0]=p*r+h*o,e[1]=p*i+h*u,e[2]=p*s+h*a,e[3]=p*o-h*r,e[4]=p*u-h*i,e[5]=p*a-h*s,e[6]=f,e[7]=l,e[8]=c,e},l.scale=function(e,t,n){var r=n[0],i=n[1];return e[0]=r*t[0],e[1]=r*t[1],e[2]=r*t[2],e[3]=i*t[3],e[4]=i*t[4],e[5]=i*t[5],e[6]=t[6],e[7]=t[7],e[8]=t[8],e},l.fromMat2d=function(e,t){return e[0]=t[0],e[1]=t[1],e[2]=0,e[3]=t[2],e[4]=t[3],e[5]=0,e[6]=t[4],e[7]=t[5],e[8]=1,e},l.fromQuat=function(e,t){var n=t[0],r=t[1],i=t[2],s=t[3],o=n+n,u=r+r,a=i+i,f=n*o,l=n*u,c=n*a,h=r*u,p=r*a,d=i*a,v=s*o,m=s*u,g=s*a;return e[0]=1-(h+d),e[3]=l+g,e[6]=c-m,e[1]=l-g,e[4]=1-(f+d),e[7]=p+v,e[2]=c+m,e[5]=p-v,e[8]=1-(f+h),e},l.normalFromMat4=function(e,t){var n=t[0],r=t[1],i=t[2],s=t[3],o=t[4],u=t[5],a=t[6],f=t[7],l=t[8],c=t[9],h=t[10],p=t[11],d=t[12],v=t[13],m=t[14],g=t[15],y=n*u-r*o,b=n*a-i*o,w=n*f-s*o,E=r*a-i*u,S=r*f-s*u,x=i*f-s*a,T=l*v-c*d,N=l*m-h*d,C=l*g-p*d,k=c*m-h*v,L=c*g-p*v,A=h*g-p*m,O=y*A-b*L+w*k+E*C-S*N+x*T;return O?(O=1/O,e[0]=(u*A-a*L+f*k)*O,e[1]=(a*C-o*A-f*N)*O,e[2]=(o*L-u*C+f*T)*O,e[3]=(i*L-r*A-s*k)*O,e[4]=(n*A-i*C+s*N)*O,e[5]=(r*C-n*L-s*T)*O,e[6]=(v*x-m*S+g*E)*O,e[7]=(m*w-d*x-g*b)*O,e[8]=(d*S-v*w+g*y)*O,e):null},l.str=function(e){return"mat3("+e[0]+", "+e[1]+", "+e[2]+", "+e[3]+", "+e[4]+", "+e[5]+", "+e[6]+", "+e[7]+", "+e[8]+")"},typeof e!="undefined"&&(e.mat3=l);var c={};c.create=function(){var e=new n(16);return e[0]=1,e[1]=0,e[2]=0,e[3]=0,e[4]=0,e[5]=1,e[6]=0,e[7]=0,e[8]=0,e[9]=0,e[10]=1,e[11]=0,e[12]=0,e[13]=0,e[14]=0,e[15]=1,e},c.clone=function(e){var t=new n(16);return t[0]=e[0],t[1]=e[1],t[2]=e[2],t[3]=e[3],t[4]=e[4],t[5]=e[5],t[6]=e[6],t[7]=e[7],t[8]=e[8],t[9]=e[9],t[10]=e[10],t[11]=e[11],t[12]=e[12],t[13]=e[13],t[14]=e[14],t[15]=e[15],t},c.copy=function(e,t){return e[0]=t[0],e[1]=t[1],e[2]=t[2],e[3]=t[3],e[4]=t[4],e[5]=t[5],e[6]=t[6],e[7]=t[7],e[8]=t[8],e[9]=t[9],e[10]=t[10],e[11]=t[11],e[12]=t[12],e[13]=t[13],e[14]=t[14],e[15]=t[15],e},c.identity=function(e){return e[0]=1,e[1]=0,e[2]=0,e[3]=0,e[4]=0,e[5]=1,e[6]=0,e[7]=0,e[8]=0,e[9]=0,e[10]=1,e[11]=0,e[12]=0,e[13]=0,e[14]=0,e[15]=1,e},c.transpose=function(e,t){if(e===t){var n=t[1],r=t[2],i=t[3],s=t[6],o=t[7],u=t[11];e[1]=t[4],e[2]=t[8],e[3]=t[12],e[4]=n,e[6]=t[9],e[7]=t[13],e[8]=r,e[9]=s,e[11]=t[14],e[12]=i,e[13]=o,e[14]=u}else e[0]=t[0],e[1]=t[4],e[2]=t[8],e[3]=t[12],e[4]=t[1],e[5]=t[5],e[6]=t[9],e[7]=t[13],e[8]=t[2],e[9]=t[6],e[10]=t[10],e[11]=t[14],e[12]=t[3],e[13]=t[7],e[14]=t[11],e[15]=t[15];return e},c.invert=function(e,t){var n=t[0],r=t[1],i=t[2],s=t[3],o=t[4],u=t[5],a=t[6],f=t[7],l=t[8],c=t[9],h=t[10],p=t[11],d=t[12],v=t[13],m=t[14],g=t[15],y=n*u-r*o,b=n*a-i*o,w=n*f-s*o,E=r*a-i*u,S=r*f-s*u,x=i*f-s*a,T=l*v-c*d,N=l*m-h*d,C=l*g-p*d,k=c*m-h*v,L=c*g-p*v,A=h*g-p*m,O=y*A-b*L+w*k+E*C-S*N+x*T;return O?(O=1/O,e[0]=(u*A-a*L+f*k)*O,e[1]=(i*L-r*A-s*k)*O,e[2]=(v*x-m*S+g*E)*O,e[3]=(h*S-c*x-p*E)*O,e[4]=(a*C-o*A-f*N)*O,e[5]=(n*A-i*C+s*N)*O,e[6]=(m*w-d*x-g*b)*O,e[7]=(l*x-h*w+p*b)*O,e[8]=(o*L-u*C+f*T)*O,e[9]=(r*C-n*L-s*T)*O,e[10]=(d*S-v*w+g*y)*O,e[11]=(c*w-l*S-p*y)*O,e[12]=(u*N-o*k-a*T)*O,e[13]=(n*k-r*N+i*T)*O,e[14]=(v*b-d*E-m*y)*O,e[15]=(l*E-c*b+h*y)*O,e):null},c.adjoint=function(e,t){var n=t[0],r=t[1],i=t[2],s=t[3],o=t[4],u=t[5],a=t[6],f=t[7],l=t[8],c=t[9],h=t[10],p=t[11],d=t[12],v=t[13],m=t[14],g=t[15];return e[0]=u*(h*g-p*m)-c*(a*g-f*m)+v*(a*p-f*h),e[1]=-(r*(h*g-p*m)-c*(i*g-s*m)+v*(i*p-s*h)),e[2]=r*(a*g-f*m)-u*(i*g-s*m)+v*(i*f-s*a),e[3]=-(r*(a*p-f*h)-u*(i*p-s*h)+c*(i*f-s*a)),e[4]=-(o*(h*g-p*m)-l*(a*g-f*m)+d*(a*p-f*h)),e[5]=n*(h*g-p*m)-l*(i*g-s*m)+d*(i*p-s*h),e[6]=-(n*(a*g-f*m)-o*(i*g-s*m)+d*(i*f-s*a)),e[7]=n*(a*p-f*h)-o*(i*p-s*h)+l*(i*f-s*a),e[8]=o*(c*g-p*v)-l*(u*g-f*v)+d*(u*p-f*c),e[9]=-(n*(c*g-p*v)-l*(r*g-s*v)+d*(r*p-s*c)),e[10]=n*(u*g-f*v)-o*(r*g-s*v)+d*(r*f-s*u),e[11]=-(n*(u*p-f*c)-o*(r*p-s*c)+l*(r*f-s*u)),e[12]=-(o*(c*m-h*v)-l*(u*m-a*v)+d*(u*h-a*c)),e[13]=n*(c*m-h*v)-l*(r*m-i*v)+d*(r*h-i*c),e[14]=-(n*(u*m-a*v)-o*(r*m-i*v)+d*(r*a-i*u)),e[15]=n*(u*h-a*c)-o*(r*h-i*c)+l*(r*a-i*u),e},c.determinant=function(e){var t=e[0],n=e[1],r=e[2],i=e[3],s=e[4],o=e[5],u=e[6],a=e[7],f=e[8],l=e[9],c=e[10],h=e[11],p=e[12],d=e[13],v=e[14],m=e[15],g=t*o-n*s,y=t*u-r*s,b=t*a-i*s,w=n*u-r*o,E=n*a-i*o,S=r*a-i*u,x=f*d-l*p,T=f*v-c*p,N=f*m-h*p,C=l*v-c*d,k=l*m-h*d,L=c*m-h*v;return g*L-y*k+b*C+w*N-E*T+S*x},c.multiply=function(e,t,n){var r=t[0],i=t[1],s=t[2],o=t[3],u=t[4],a=t[5],f=t[6],l=t[7],c=t[8],h=t[9],p=t[10],d=t[11],v=t[12],m=t[13],g=t[14],y=t[15],b=n[0],w=n[1],E=n[2],S=n[3];return e[0]=b*r+w*u+E*c+S*v,e[1]=b*i+w*a+E*h+S*m,e[2]=b*s+w*f+E*p+S*g,e[3]=b*o+w*l+E*d+S*y,b=n[4],w=n[5],E=n[6],S=n[7],e[4]=b*r+w*u+E*c+S*v,e[5]=b*i+w*a+E*h+S*m,e[6]=b*s+w*f+E*p+S*g,e[7]=b*o+w*l+E*d+S*y,b=n[8],w=n[9],E=n[10],S=n[11],e[8]=b*r+w*u+E*c+S*v,e[9]=b*i+w*a+E*h+S*m,e[10]=b*s+w*f+E*p+S*g,e[11]=b*o+w*l+E*d+S*y,b=n[12],w=n[13],E=n[14],S=n[15],e[12]=b*r+w*u+E*c+S*v,e[13]=b*i+w*a+E*h+S*m,e[14]=b*s+w*f+E*p+S*g,e[15]=b*o+w*l+E*d+S*y,e},c.mul=c.multiply,c.translate=function(e,t,n){var r=n[0],i=n[1],s=n[2],o,u,a,f,l,c,h,p,d,v,m,g;return t===e?(e[12]=t[0]*r+t[4]*i+t[8]*s+t[12],e[13]=t[1]*r+t[5]*i+t[9]*s+t[13],e[14]=t[2]*r+t[6]*i+t[10]*s+t[14],e[15]=t[3]*r+t[7]*i+t[11]*s+t[15]):(o=t[0],u=t[1],a=t[2],f=t[3],l=t[4],c=t[5],h=t[6],p=t[7],d=t[8],v=t[9],m=t[10],g=t[11],e[0]=o,e[1]=u,e[2]=a,e[3]=f,e[4]=l,e[5]=c,e[6]=h,e[7]=p,e[8]=d,e[9]=v,e[10]=m,e[11]=g,e[12]=o*r+l*i+d*s+t[12],e[13]=u*r+c*i+v*s+t[13],e[14]=a*r+h*i+m*s+t[14],e[15]=f*r+p*i+g*s+t[15]),e},c.scale=function(e,t,n){var r=n[0],i=n[1],s=n[2];return e[0]=t[0]*r,e[1]=t[1]*r,e[2]=t[2]*r,e[3]=t[3]*r,e[4]=t[4]*i,e[5]=t[5]*i,e[6]=t[6]*i,e[7]=t[7]*i,e[8]=t[8]*s,e[9]=t[9]*s,e[10]=t[10]*s,e[11]=t[11]*s,e[12]=t[12],e[13]=t[13],e[14]=t[14],e[15]=t[15],e},c.rotate=function(e,n,r,i){var s=i[0],o=i[1],u=i[2],a=Math.sqrt(s*s+o*o+u*u),f,l,c,h,p,d,v,m,g,y,b,w,E,S,x,T,N,C,k,L,A,O,M,_;return Math.abs(a)<t?null:(a=1/a,s*=a,o*=a,u*=a,f=Math.sin(r),l=Math.cos(r),c=1-l,h=n[0],p=n[1],d=n[2],v=n[3],m=n[4],g=n[5],y=n[6],b=n[7],w=n[8],E=n[9],S=n[10],x=n[11],T=s*s*c+l,N=o*s*c+u*f,C=u*s*c-o*f,k=s*o*c-u*f,L=o*o*c+l,A=u*o*c+s*f,O=s*u*c+o*f,M=o*u*c-s*f,_=u*u*c+l,e[0]=h*T+m*N+w*C,e[1]=p*T+g*N+E*C,e[2]=d*T+y*N+S*C,e[3]=v*T+b*N+x*C,e[4]=h*k+m*L+w*A,e[5]=p*k+g*L+E*A,e[6]=d*k+y*L+S*A,e[7]=v*k+b*L+x*A,e[8]=h*O+m*M+w*_,e[9]=p*O+g*M+E*_,e[10]=d*O+y*M+S*_,e[11]=v*O+b*M+x*_,n!==e&&(e[12]=n[12],e[13]=n[13],e[14]=n[14],e[15]=n[15]),e)},c.rotateX=function(e,t,n){var r=Math.sin(n),i=Math.cos(n),s=t[4],o=t[5],u=t[6],a=t[7],f=t[8],l=t[9],c=t[10],h=t[11];return t!==e&&(e[0]=t[0],e[1]=t[1],e[2]=t[2],e[3]=t[3],e[12]=t[12],e[13]=t[13],e[14]=t[14],e[15]=t[15]),e[4]=s*i+f*r,e[5]=o*i+l*r,e[6]=u*i+c*r,e[7]=a*i+h*r,e[8]=f*i-s*r,e[9]=l*i-o*r,e[10]=c*i-u*r,e[11]=h*i-a*r,e},c.rotateY=function(e,t,n){var r=Math.sin(n),i=Math.cos(n),s=t[0],o=t[1],u=t[2],a=t[3],f=t[8],l=t[9],c=t[10],h=t[11];return t!==e&&(e[4]=t[4],e[5]=t[5],e[6]=t[6],e[7]=t[7],e[12]=t[12],e[13]=t[13],e[14]=t[14],e[15]=t[15]),e[0]=s*i-f*r,e[1]=o*i-l*r,e[2]=u*i-c*r,e[3]=a*i-h*r,e[8]=s*r+f*i,e[9]=o*r+l*i,e[10]=u*r+c*i,e[11]=a*r+h*i,e},c.rotateZ=function(e,t,n){var r=Math.sin(n),i=Math.cos(n),s=t[0],o=t[1],u=t[2],a=t[3],f=t[4],l=t[5],c=t[6],h=t[7];return t!==e&&(e[8]=t[8],e[9]=t[9],e[10]=t[10],e[11]=t[11],e[12]=t[12],e[13]=t[13],e[14]=t[14],e[15]=t[15]),e[0]=s*i+f*r,e[1]=o*i+l*r,e[2]=u*i+c*r,e[3]=a*i+h*r,e[4]=f*i-s*r,e[5]=l*i-o*r,e[6]=c*i-u*r,e[7]=h*i-a*r,e},c.fromRotationTranslation=function(e,t,n){var r=t[0],i=t[1],s=t[2],o=t[3],u=r+r,a=i+i,f=s+s,l=r*u,c=r*a,h=r*f,p=i*a,d=i*f,v=s*f,m=o*u,g=o*a,y=o*f;return e[0]=1-(p+v),e[1]=c+y,e[2]=h-g,e[3]=0,e[4]=c-y,e[5]=1-(l+v),e[6]=d+m,e[7]=0,e[8]=h+g,e[9]=d-m,e[10]=1-(l+p),e[11]=0,e[12]=n[0],e[13]=n[1],e[14]=n[2],e[15]=1,e},c.fromQuat=function(e,t){var n=t[0],r=t[1],i=t[2],s=t[3],o=n+n,u=r+r,a=i+i,f=n*o,l=n*u,c=n*a,h=r*u,p=r*a,d=i*a,v=s*o,m=s*u,g=s*a;return e[0]=1-(h+d),e[1]=l+g,e[2]=c-m,e[3]=0,e[4]=l-g,e[5]=1-(f+d),e[6]=p+v,e[7]=0,e[8]=c+m,e[9]=p-v,e[10]=1-(f+h),e[11]=0,e[12]=0,e[13]=0,e[14]=0,e[15]=1,e},c.frustum=function(e,t,n,r,i,s,o){var u=1/(n-t),a=1/(i-r),f=1/(s-o);return e[0]=s*2*u,e[1]=0,e[2]=0,e[3]=0,e[4]=0,e[5]=s*2*a,e[6]=0,e[7]=0,e[8]=(n+t)*u,e[9]=(i+r)*a,e[10]=(o+s)*f,e[11]=-1,e[12]=0,e[13]=0,e[14]=o*s*2*f,e[15]=0,e},c.perspective=function(e,t,n,r,i){var s=1/Math.tan(t/2),o=1/(r-i);return e[0]=s/n,e[1]=0,e[2]=0,e[3]=0,e[4]=0,e[5]=s,e[6]=0,e[7]=0,e[8]=0,e[9]=0,e[10]=(i+r)*o,e[11]=-1,e[12]=0,e[13]=0,e[14]=2*i*r*o,e[15]=0,e},c.ortho=function(e,t,n,r,i,s,o){var u=1/(t-n),a=1/(r-i),f=1/(s-o);return e[0]=-2*u,e[1]=0,e[2]=0,e[3]=0,e[4]=0,e[5]=-2*a,e[6]=0,e[7]=0,e[8]=0,e[9]=0,e[10]=2*f,e[11]=0,e[12]=(t+n)*u,e[13]=(i+r)*a,e[14]=(o+s)*f,e[15]=1,e},c.lookAt=function(e,n,r,i){var s,o,u,a,f,l,h,p,d,v,m=n[0],g=n[1],y=n[2],b=i[0],w=i[1],E=i[2],S=r[0],x=r[1],T=r[2];return Math.abs(m-S)<t&&Math.abs(g-x)<t&&Math.abs(y-T)<t?c.identity(e):(h=m-S,p=g-x,d=y-T,v=1/Math.sqrt(h*h+p*p+d*d),h*=v,p*=v,d*=v,s=w*d-E*p,o=E*h-b*d,u=b*p-w*h,v=Math.sqrt(s*s+o*o+u*u),v?(v=1/v,s*=v,o*=v,u*=v):(s=0,o=0,u=0),a=p*u-d*o,f=d*s-h*u,l=h*o-p*s,v=Math.sqrt(a*a+f*f+l*l),v?(v=1/v,a*=v,f*=v,l*=v):(a=0,f=0,l=0),e[0]=s,e[1]=a,e[2]=h,e[3]=0,e[4]=o,e[5]=f,e[6]=p,e[7]=0,e[8]=u,e[9]=l,e[10]=d,e[11]=0,e[12]=-(s*m+o*g+u*y),e[13]=-(a*m+f*g+l*y),e[14]=-(h*m+p*g+d*y),e[15]=1,e)},c.str=function(e){return"mat4("+e[0]+", "+e[1]+", "+e[2]+", "+e[3]+", "+e[4]+", "+e[5]+", "+e[6]+", "+e[7]+", "+e[8]+", "+e[9]+", "+e[10]+", "+e[11]+", "+e[12]+", "+e[13]+", "+e[14]+", "+e[15]+")"},typeof e!="undefined"&&(e.mat4=c);var h={};h.create=function(){var e=new n(4);return e[0]=0,e[1]=0,e[2]=0,e[3]=1,e},h.rotationTo=function(){var e=o.create(),t=o.fromValues(1,0,0),n=o.fromValues(0,1,0);return function(r,i,s){var u=o.dot(i,s);return u<-0.999999?(o.cross(e,t,i),o.length(e)<1e-6&&o.cross(e,n,i),o.normalize(e,e),h.setAxisAngle(r,e,Math.PI),r):u>.999999?(r[0]=0,r[1]=0,r[2]=0,r[3]=1,r):(o.cross(e,i,s),r[0]=e[0],r[1]=e[1],r[2]=e[2],r[3]=1+u,h.normalize(r,r))}}(),h.setAxes=function(){var e=l.create();return function(t,n,r,i){return e[0]=r[0],e[3]=r[1],e[6]=r[2],e[1]=i[0],e[4]=i[1],e[7]=i[2],e[2]=n[0],e[5]=n[1],e[8]=n[2],h.normalize(t,h.fromMat3(t,e))}}(),h.clone=u.clone,h.fromValues=u.fromValues,h.copy=u.copy,h.set=u.set,h.identity=function(e){return e[0]=0,e[1]=0,e[2]=0,e[3]=1,e},h.setAxisAngle=function(e,t,n){n*=.5;var r=Math.sin(n);return e[0]=r*t[0],e[1]=r*t[1],e[2]=r*t[2],e[3]=Math.cos(n),e},h.add=u.add,h.multiply=function(e,t,n){var r=t[0],i=t[1],s=t[2],o=t[3],u=n[0],a=n[1],f=n[2],l=n[3];return e[0]=r*l+o*u+i*f-s*a,e[1]=i*l+o*a+s*u-r*f,e[2]=s*l+o*f+r*a-i*u,e[3]=o*l-r*u-i*a-s*f,e},h.mul=h.multiply,h.scale=u.scale,h.rotateX=function(e,t,n){n*=.5;var r=t[0],i=t[1],s=t[2],o=t[3],u=Math.sin(n),a=Math.cos(n);return e[0]=r*a+o*u,e[1]=i*a+s*u,e[2]=s*a-i*u,e[3]=o*a-r*u,e},h.rotateY=function(e,t,n){n*=.5;var r=t[0],i=t[1],s=t[2],o=t[3],u=Math.sin(n),a=Math.cos(n);return e[0]=r*a-s*u,e[1]=i*a+o*u,e[2]=s*a+r*u,e[3]=o*a-i*u,e},h.rotateZ=function(e,t,n){n*=.5;var r=t[0],i=t[1],s=t[2],o=t[3],u=Math.sin(n),a=Math.cos(n);return e[0]=r*a+i*u,e[1]=i*a-r*u,e[2]=s*a+o*u,e[3]=o*a-s*u,e},h.calculateW=function(e,t){var n=t[0],r=t[1],i=t[2];return e[0]=n,e[1]=r,e[2]=i,e[3]=-Math.sqrt(Math.abs(1-n*n-r*r-i*i)),e},h.dot=u.dot,h.lerp=u.lerp,h.slerp=function(e,t,n,r){var i=t[0],s=t[1],o=t[2],u=t[3],a=n[0],f=n[1],l=n[2],c=n[3],h,p,d,v,m;return p=i*a+s*f+o*l+u*c,p<0&&(p=-p,a=-a,f=-f,l=-l,c=-c),1-p>1e-6?(h=Math.acos(p),d=Math.sin(h),v=Math.sin((1-r)*h)/d,m=Math.sin(r*h)/d):(v=1-r,m=r),e[0]=v*i+m*a,e[1]=v*s+m*f,e[2]=v*o+m*l,e[3]=v*u+m*c,e},h.invert=function(e,t){var n=t[0],r=t[1],i=t[2],s=t[3],o=n*n+r*r+i*i+s*s,u=o?1/o:0;return e[0]=-n*u,e[1]=-r*u,e[2]=-i*u,e[3]=s*u,e},h.conjugate=function(e,t){return e[0]=-t[0],e[1]=-t[1],e[2]=-t[2],e[3]=t[3],e},h.length=u.length,h.len=h.length,h.squaredLength=u.squaredLength,h.sqrLen=h.squaredLength,h.normalize=u.normalize,h.fromMat3=function(){var e=typeof Int8Array!="undefined"?new Int8Array([1,2,0]):[1,2,0];return function(t,n){var r=n[0]+n[4]+n[8],i;if(r>0)i=Math.sqrt(r+1),t[3]=.5*i,i=.5/i,t[0]=(n[7]-n[5])*i,t[1]=(n[2]-n[6])*i,t[2]=(n[3]-n[1])*i;else{var s=0;n[4]>n[0]&&(s=1),n[8]>n[s*3+s]&&(s=2);var o=e[s],u=e[o];i=Math.sqrt(n[s*3+s]-n[o*3+o]-n[u*3+u]+1),t[s]=.5*i,i=.5/i,t[3]=(n[u*3+o]-n[o*3+u])*i,t[o]=(n[o*3+s]+n[s*3+o])*i,t[u]=(n[u*3+s]+n[s*3+u])*i}return t}}(),h.str=function(e){return"quat("+e[0]+", "+e[1]+", "+e[2]+", "+e[3]+")"},typeof e!="undefined"&&(e.quat=h)}(t.exports)})(this);

glutil.js

if (WebGLRenderingContext) {
    WebGLRenderingContext.prototype.getShader = function(id) {
        var script = document.getElementById(id);
        if (!script) {
            console.error('Shader not found');
            alert("Could not find shader " + id);
            return null;
        }

        switch (script && script.type) {
            case 'x-shader/x-fragment': var shader = this.createShader(this.FRAGMENT_SHADER); break;
            case 'x-shader/x-vertex':   var shader = this.createShader(this.VERTEX_SHADER); break;
            default: return null;
        }

        this.shaderSource(shader, script.innerText || script.text);
        this.compileShader(shader);
        if (!this.getShaderParameter(shader, this.COMPILE_STATUS)) {
            console.error(this.getShaderInfoLog(shader));
            return null;
        } else {
            return shader;
        }
    };

    WebGLRenderingContext.prototype.initializeShader = function(name, attributes, uniforms) {
        var shader = {
            program: this.createProgram(),
            fragment: this.getShader(name + "-fragment"),
            vertex: this.getShader(name + "-vertex"),
            attributes: []
        };
        this.attachShader(shader.program, shader.vertex);
        this.attachShader(shader.program, shader.fragment);
        this.linkProgram(shader.program);

        if (!this.getProgramParameter(shader.program, this.LINK_STATUS)) {
            console.error(this.getProgramInfoLog(shader.program));
            alert("Could not initialize shader " + name);
        } else {
            for (var i = 0; i < attributes.length; i++) {
                shader[attributes[i]] = this.getAttribLocation(shader.program, attributes[i]);
                shader.attributes.push(shader[attributes[i]]);
            }
            for (var i = 0; i < uniforms.length; i++) {
                shader[uniforms[i]] = this.getUniformLocation(shader.program, uniforms[i]);
            }
        }

        return shader;
    };

    // Switches to a different shader program.
    WebGLRenderingContext.prototype.switchShader = function(shader, matrix) {
        if (!matrix) {
            console.trace('matrix does not have required argument');
        }

        if (this.currentShader !== shader) {
            this.useProgram(shader.program);

            // Disable all attributes from the existing shader that aren't used in
            // the new shader. Note: attribute indices are *not* program specific!
            var enabled = this.currentShader ? this.currentShader.attributes : [];
            var required = shader.attributes;

            for (var i = 0; i < enabled.length; i++) {
                if (required.indexOf(enabled[i]) < 0) {
                    this.disableVertexAttribArray(enabled[i]);
                }
            }

            // Enable all attributes for the new shader.
            for (var j = 0; j < required.length; j++) {
                if (enabled.indexOf(required[j]) < 0) {
                    this.enableVertexAttribArray(required[j]);
                }
            }

            this.currentShader = shader;
        }

        // Update the matrices if necessary. Note: This relies on object identity!
        // This means changing the matrix values without the actual matrix object
        // will FAIL to update the matrix properly.
        if (shader.matrix !== matrix) {
            this.uniformMatrix4fv(shader.u_matrix, false, matrix);
            shader.matrix = matrix;
        }
    };
}

index.html

<head>
<meta charset="utf-8">
<script src="glutil.js"></script>
<script src="glmatrix.js"></script>
<script src="domready.js"></script>
<script src="OpenSans-Regular.json"></script>
</head>
<body>

<style>
canvas {
    position: absolute;
    top:140px;
    left:0;
    border:1px solid black;
}
</style>

<canvas id="webgl" width="1024" height="512" style=""></canvas>
<div style="float:left;">
    <label><input type="range" style="width:400px" value="26" step="0.01" min="6" max="128.0" id="scale"> Size</label><br>
    <label><input type="range" style="width:400px" value="0" step="0.01" min="0.0" max="10.0" id="translateX"> Translate X</label><br>
    <label><input type="range" style="width:400px" value="0.2" step="0.01" min="0.1" max="0.7" id="buffer"> Buffer</label><br>
    <label><input type="range" style="width:400px" value="0" step="0.01" min="-3.141592" max="3.141592" id="angle"> Angle</label><br>
    <label><input type="range" style="width:400px" value="1" step="0.01" min="0" max="4" id="gamma"> Gamma</label><br>
    <label><input type="checkbox" id="debug"> Texture</label><br>
</div>

<a href="https://www.mapbox.com/blog/text-signed-distance-fields/"/>Read blog post</a>

<script id="sdf-vertex" type="x-shader/x-vertex">
attribute vec2 a_pos;
attribute vec2 a_texcoord;

uniform mat4 u_matrix;
uniform vec2 u_texsize;

varying vec2 v_texcoord;

void main() {
    gl_Position = u_matrix * vec4(a_pos.xy, 0, 1);
    v_texcoord = a_texcoord / u_texsize;
}
</script>



<script id="sdf-fragment" type="x-shader/x-fragment">
precision mediump float;

uniform sampler2D u_texture;
uniform vec4 u_color;
uniform float u_buffer;
uniform float u_gamma;
uniform float u_debug;

varying vec2 v_texcoord;

void main() {
    float dist = texture2D(u_texture, v_texcoord).r;
    if (u_debug > 0.0) {
        gl_FragColor = vec4(dist, dist, dist, 1);
    } else {
        float alpha = smoothstep(u_buffer - u_gamma, u_buffer + u_gamma, dist);
        gl_FragColor = vec4(u_color.rgb, alpha * u_color.a);
    }
}
</script>



<script type="text/javascript">

function loadCanvas(url, done) {
    var img = new Image();
    img.onload = function() { done(img); };

    img.src = url;
}

var scale = 64;

function drawGlyph(chr, pen, size, vertexElements, textureElements) {
    var metric = metrics.chars[chr];
    if (!metric) return;

    var scale = size / metrics.size;

    var factor = 1;

    var width = metric[0];
    var height = metric[1];
    var horiBearingX = metric[2];
    var horiBearingY = metric[3];
    var horiAdvance = metric[4];
    var posX = metric[5];
    var posY = metric[6];

    if (width > 0 && height > 0) {
        width += metrics.buffer * 2;
        height += metrics.buffer * 2;

        // Add a quad (= two triangles) per glyph.
        vertexElements.push(
            (factor * (pen.x + ((horiBearingX - metrics.buffer) * scale))), (factor * (pen.y - horiBearingY * scale)),
            (factor * (pen.x + ((horiBearingX - metrics.buffer + width) * scale))), (factor * (pen.y - horiBearingY * scale)),
            (factor * (pen.x + ((horiBearingX - metrics.buffer) * scale))), (factor * (pen.y + (height - horiBearingY) * scale)),

            (factor * (pen.x + ((horiBearingX - metrics.buffer + width) * scale))), (factor * (pen.y - horiBearingY * scale)),
            (factor * (pen.x + ((horiBearingX - metrics.buffer) * scale))), (factor * (pen.y + (height - horiBearingY) * scale)),
            (factor * (pen.x + ((horiBearingX - metrics.buffer + width) * scale))), (factor * (pen.y + (height - horiBearingY) * scale))
        );

        textureElements.push(
            posX, posY,
            posX + width, posY,
            posX, posY + height,

            posX + width, posY,
            posX, posY + height,
            posX + width, posY + height
        );
    }

    // pen.x += Math.ceil(horiAdvance * scale);
    pen.x = pen.x + horiAdvance * scale;
}


function measureText(text, size) {
    var dimensions = {
        advance: 0
    }

    var scale = size / metrics.size;
    for (var i = 0; i < text.length; i++) {
        var horiAdvance = metrics.chars[text[i]][4];
        dimensions.advance += horiAdvance * scale;
    }

    return dimensions;
}



// Initialize GL Canvas
var canvas = document.getElementById('webgl');


var pixelRatio = 'devicePixelRatio' in window ? devicePixelRatio : 1;

if (devicePixelRatio > 1 && !canvas.scaled) {
    pixelRatio = devicePixelRatio;
    canvas.style.width = canvas.width + 'px';
    canvas.width = canvas.width * pixelRatio;
    canvas.style.height = canvas.height + 'px';
    canvas.height = canvas.height * pixelRatio;
    canvas.scaled = true;
}

var gl = canvas.getContext("experimental-webgl", { antialias: false });
if (!gl) {
    alert('Failed to initialize WebGL');
}

gl.getExtension("OES_standard_derivatives");

// Initialize shaders
var shader = gl.initializeShader('sdf',
    ['a_pos', 'a_texcoord'],
    ['u_matrix', 'u_texture', 'u_texsize', 'u_color', 'u_buffer', 'u_gamma', 'u_debug']);

gl.useProgram(shader.program);
gl.enableVertexAttribArray(shader.a_pos);
gl.enableVertexAttribArray(shader.a_texcoord);




var pMatrix = mat4.create();
mat4.ortho(pMatrix, 0, gl.canvas.width, gl.canvas.height, 0, 0, -1);


gl.blendFuncSeparate(
    gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA,
    gl.ONE, gl.ONE);

gl.enable(gl.BLEND);

var texture = gl.createTexture();


var vertexBuffer = gl.createBuffer();
var textureBuffer = gl.createBuffer();



var str = "AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUu";

function createText(size) {
    var vertexElements = [];
    var textureElements = [];

    var dimensions = measureText(str, size);

    var pen = { x: canvas.width / 2 - dimensions.advance / 2, y: canvas.height / 2 };
    for (var i = 0; i < str.length; i++) {
        var chr = str[i];
        drawGlyph(chr, pen, size, vertexElements, textureElements);
    }

    gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertexElements), gl.STATIC_DRAW);
    vertexBuffer.numItems = vertexElements.length / 2;

    gl.bindBuffer(gl.ARRAY_BUFFER, textureBuffer);
    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(textureElements), gl.STATIC_DRAW);
    textureBuffer.numItems = textureElements.length / 2;
}




loadCanvas("OpenSans-Regular.png", function(atlas) {
    gl.bindTexture(gl.TEXTURE_2D, texture);
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.LUMINANCE, gl.LUMINANCE, gl.UNSIGNED_BYTE, atlas);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);

    gl.uniform2f(shader.u_texsize, atlas.width, atlas.height)

    draw();
});


function draw() {
    gl.clearColor(0.9, 0.9, 0.9, 1);
    gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);


    var scale = +document.getElementById('scale').value;
    var buffer = +document.getElementById('buffer').value;
    var angle = +document.getElementById('angle').value;
    var translateX = +document.getElementById('translateX').value;
    var gamma = +document.getElementById('gamma').value;
    var debug = +document.getElementById('debug').checked;


    createText(scale);

    var mvMatrix = mat4.create();
    mat4.identity(mvMatrix);
    mat4.translate(mvMatrix, mvMatrix, [ canvas.width / 2, canvas.height / 2, 0 ]);
    mat4.rotateZ(mvMatrix, mvMatrix, angle);
    mat4.translate(mvMatrix, mvMatrix, [ -canvas.width / 2, -canvas.height / 2, 0 ]);
    mat4.translate(mvMatrix, mvMatrix, [ translateX, 0, 0 ]);

    var mvpMatrix = mat4.create();
    mat4.multiply(mvpMatrix, pMatrix, mvMatrix);
    gl.uniformMatrix4fv(shader.u_matrix, false, mvpMatrix);

    gl.activeTexture(gl.TEXTURE0);
    gl.bindTexture(gl.TEXTURE_2D, texture);
    gl.uniform1i(shader.u_texture, 0);

    gl.uniform1f(shader.u_scale, 1.0);
    gl.uniform1f(shader.u_debug, debug ? 1 : 0);

    gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
    gl.vertexAttribPointer(shader.a_pos, 2, gl.FLOAT, false, 0, 0);


    gl.bindBuffer(gl.ARRAY_BUFFER, textureBuffer);
    gl.vertexAttribPointer(shader.a_texcoord, 2, gl.FLOAT, false, 0, 0);

    gl.uniform4fv(shader.u_color, [ 1, 1, 1, 1 ]);
    gl.uniform1f(shader.u_buffer, buffer);
    gl.drawArrays(gl.TRIANGLES, 0, vertexBuffer.numItems);

    gl.uniform4fv(shader.u_color, [ 0, 0, 0, 1 ]);
    gl.uniform1f(shader.u_buffer, 192 / 256);
    gl.uniform1f(shader.u_gamma, gamma * 1.4142 / scale);
    gl.drawArrays(gl.TRIANGLES, 0, vertexBuffer.numItems);
}


document.getElementById('scale').oninput = draw;
document.getElementById('buffer').oninput = draw;
document.getElementById('angle').oninput = draw;
document.getElementById('translateX').oninput = draw;
document.getElementById('gamma').oninput = draw;
document.getElementById('debug').oninput = draw;

</script>

OpenSans-Regular.json

var metrics = {"family":"Open Sans","style":"Regular","buffer":3,"size":24,"chars":{" 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OpenSans-Regular.png

Web GL font - with Signed Distance Fields

Live demo:
http://bl.ocks.org/klokan/raw/9ba0fd74e9c77db4c3540cf2b1c95dba/

Blog post:
https://www.mapbox.com/blog/text-signed-distance-fields/

hi， I want to know how the font png and json file generated? can you tell me ?

Your friend
xduoo@qq.com
Best wishes