emscripten-examples.js

      var statusElement = document.getElementById('status');
      var progressElement = document.getElementById('progress');
      var spinnerElement = document.getElementById('spinner');
      var Module = {
        preRun: [function() {
          ENV.RUST_BACKTRACE = 1;
          
          var canvas_click = Module.cwrap ("canvas_click", null, ["number", "number"]) ;
          canvas.addEventListener("click", function (event) {
            var offset = canvas.getBoundingClientRect();
            var x = (event.pageX - offset.left) /offset.width;
            var y = (event.pageY - offset.top) /offset.height;
            console.log (x, y);
            canvas_click (x, y);
          });
        }],
        postRun: [],
        TOTAL_MEMORY: 537395200,
        print: (function() {
          var element = document.getElementById('output');
          if (element) element.value = ''; // clear browser cache
          return function(text) {
            if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
            // These replacements are necessary if you render to raw HTML
            //text = text.replace(/&/g, "&");
            //text = text.replace(/</g, "&lt;");
            //text = text.replace(/>/g, "&gt;");
            //text = text.replace('\n', '<br>', 'g');
            console.log(text);
            if (element) {
              element.value += text + "\n";
              element.scrollTop = element.scrollHeight; // focus on bottom
            }
          };
        })(),
        printErr: function(text) {
          if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
          if (0) { // XXX disabled for safety typeof dump == 'function') {
            dump(text + '\n'); // fast, straight to the real console
          } else {
            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;
            spinnerElement.hidden = false;
          } else {
            progressElement.value = null;
            progressElement.max = null;
            progressElement.hidden = true;
            if (!text) spinnerElement.style.display = 'none';
          }
          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(event) {
        // TODO: do not warn on ok events like simulating an infinite loop or exitStatus
        Module.setStatus('Exception thrown, see JavaScript console');
        spinnerElement.style.display = 'none';
        Module.setStatus = function(text) {
          if (text) Module.printErr('[post-exception status] ' + text);
        };
      };
      function resize_canvas () {
        var size = Math.min (window.innerHeight, window.innerWidth, 600);
        canvas.setAttribute ("width", size);
        canvas.setAttribute ("height", size);
      }
      window.addEventListener("resize", resize_canvas);
      resize_canvas ();