docs/mpview.html

<!doctype html>
<html lang="en-us">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <style>
      body { margin:0px; padding: 0px; overflow: hidden; }
      .emscripten { padding-right: 0; margin-left: auto; margin-right: auto; display: block; }
      div.emscripten { text-align: center; }
      canvas.emscripten { 
          border:           0px none;  /* no border, otherwise mouse coords will be wrong */
          padding:          0px;       /* no padding, otherwise mouse coords will be wrong */
          background-color: white;
          width:            100vw;     /* be as wide as possible */
          height:           100vh;     /* be as tall as possible */
          max-height:       100vh;     /* don't grow more than screen height */
          display:          block;
          overflow:         hidden;    /* avoids scrollbars during loading */
      }
    </style>
  </head>

  <body>
    <div class="emscripten" id="status">Downloading...</div>
    <div class="emscripten">
      <progress value="0" max="100" id="progress" hidden=1></progress>  
    </div>
    <canvas class="emscripten" id="canvas" oncontextmenu="event.preventDefault()"></canvas>
    
    <script type='text/javascript'>
      var statusElement = document.getElementById('status');
      var progressElement = document.getElementById('progress');

      var urlParams = new URLSearchParams(window.location.search);
      var frameElem = window.frameElement;
      
      function hasParam(name) {
          if (urlParams && urlParams.has(name))
              return true;
          else if (frameElem && frameElem.hasAttribute("data-"+name))
              return true;
          return false;
      }
      
      function getParam(name) {
          if (urlParams && urlParams.has(name))
              return urlParams.get(name);
          else if (frameElem && frameElem.hasAttribute("data-"+name))
              return frameElem.getAttribute("data-"+name);
          return undefined;
      }
      
      function getFile(name) {
          var base = (window.location != window.parent.location) ? document.referrer : document.location.href;
          var url  = new URL(name, base);
          var path = url.pathname;
          var file = path.split('/').pop();
          return [ file, path ];
      }

      // here we collect the command line arguments to pass to the main function
      var argv = [];

      var Module = {

          preRun: [ function(){

              // show imgui controls?
              if (hasParam('controls'))
              { 
                  argv.push("-g");
              }

              // model to be loaded 
              if (hasParam('model'))
              {
                  var [filename, pathname ] = getFile(getParam('model'));
                  FS.createPreloadedFile('./', filename, pathname, true, false);
                  argv.push(filename);
              }

              // matcap to be used
              if (hasParam('material'))
              {
                  var [filename, pathname] = getFile(getParam('material'));
                  FS.createPreloadedFile('./', filename, pathname, true, false);
                  argv.push("-m");
                  argv.push(filename);
              }

              // texture to be used
              if (hasParam('texture'))
              {
                  var [filename, pathname] = getFile(getParam('texture'));
                  FS.createPreloadedFile('./', filename, pathname, true, false);
                  argv.push("-t");
                  argv.push(filename);
              }
          }],

          arguments: argv,

          postRun: [],

          print: function(text) {
              console.log(text);
          },

          printErr: function(text) {
              console.error(text);
          },

          canvas: (function() {
              var canvas = document.getElementById('canvas');

              // As a default initial behavior, pop up an alert when webgl context is lost. To make your
              // application robust, you may want to override this behavior before shipping!
              // See http://www.khronos.org/registry/webgl/specs/latest/1.0/#5.15.2
              canvas.addEventListener("webglcontextlost", function(e) { alert('WebGL context lost. You will need to reload the page.'); e.preventDefault(); }, false);

              return canvas;
          })(),

          setStatus: function(text) {
              if (!Module.setStatus.last) Module.setStatus.last = { time: Date.now(), text: '' };
              if (text === Module.setStatus.text) return;
              var m = text.match(/([^(]+)\((\d+(\.\d+)?)\/(\d+)\)/);
              var now = Date.now();
              if (m && now - Date.now() < 30) return; // if this is a progress update, skip it if too soon
              if (m) {
                  text = m[1];
                  progressElement.value = parseInt(m[2])*100;
                  progressElement.max = parseInt(m[4])*100;
                  progressElement.hidden = false;
              } else {
                  progressElement.value = null;
                  progressElement.max = null;
                  progressElement.hidden = true;
              }
              statusElement.innerHTML = text;
          },

          totalDependencies: 0,

          monitorRunDependencies: function(left) {
              this.totalDependencies = Math.max(this.totalDependencies, left);
              Module.setStatus(left ? 'Preparing... (' + (this.totalDependencies-left) + '/' + this.totalDependencies + ')' : 'All downloads complete.');
          }

      };

      Module.setStatus('Downloading...');
      window.onerror = function() {
        Module.setStatus('Exception thrown, see JavaScript console');
        Module.setStatus = function(text) {
          if (text) Module.printErr('[post-exception status] ' + text);
        };
      };
    </script>
    <script async type="text/javascript" src="mpview.js"></script>
  </body>
</html>