src/library_sdl.js


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//"use strict";

// To use emscripten's SDL library here, you need to define
// Module.canvas.
//
// More specifically, our SDL implementation will look for
// Module.canvas. You should fill it using something like
//
//      function onLoad() {
//        // Pass canvas and context to the generated code
//        Module.canvas = document.getElementById('canvas');
//      }
//
// Note that this must be called during onload, since you will
// only be able to access the canvas element in the page after
// it loads. You will likely also want to disable running by
// default, with something like
//
//      var Module = {
//        noInitialRun: true
//      };
//
// which is defined BEFORE you load the compiled code.

// The test_emcc test in the tests/runner.py will test this
// in its last phase, where it generates HTML. You can see
// a concrete example there. The HTML source is in src/shell.html.
// Here is a more comprehensive example:

/*
<html>
  <head>
    <title>Demo</title>
    <script type='text/javascript'>
      var Module = {
        noInitialRun: true
      };

      // implement print
      var print = function(text) {
        var element = document.getElementById('output')
        element.innerHTML = text.replace('\n', '<br>', 'g') + element.innerHTML;
      }
    </script>
    <script src='doom.ccsimple.js' type='text/javascript'></script>
    <script type='text/javascript'>
      function onLoad() {
        // Pass canvas and context to the generated code, and do the actual run() here
        Module.canvas = document.getElementById('canvas');
        Module.run();
      }
    </script>
  <body onload='onLoad()' style='background-color: black; color: white'>
    <center>
      <canvas id='canvas' width='320' height='200'></canvas>
    </center>
    <div id='output'></div>
  </body>
</html>
*/

// Other stuff to take into account:
//
//  * Make sure alpha values are proper in your input. If they are all 0, everything will be transparent!
//
//  * Your code should not write a 32-bit value and expect that to set an RGBA pixel.
//    The reason is that that data will be read as 8-bit values, and according to the
//    load-store consistency assumption, it should be written that way (see docs/paper.pdf).
//    Instead, do something like        *ptr++ = R; *ptr++ = G; *ptr++ = B;
//
//  * A normal C++ main loop with SDL_Delay will not work in JavaScript - there is no way
//    to wait for a short time without locking up the web page entirely. The simplest
//    solution here is to have a singleIteration() function which is a single loop
//    iteration, and from JS to do something like      setInterval(_singleIteration, 1/30)
//
//  * SDL_Quit does nothing.

var LibrarySDL = {
  $SDL__deps: ['$FS', '$Browser'],
  $SDL: {
    defaults: {
      width: 320,
      height: 200,
      copyOnLock: true
    },

    version: null,

    surfaces: {},
    events: [],
    audios: [null],
    fonts: [null],

    keyboardState: null,
    startTime: null,
    mouseX: 0,
    mouseY: 0,

    DOMEventToSDLEvent: {
      'keydown': 0x300,
      'keyup': 0x301,
      'mousedown': 0x401,
      'mouseup': 0x402,
      'mousemove': 0x400
    },

    keyCodes: { // DOM code ==> SDL code. See https://developer.mozilla.org/en/Document_Object_Model_%28DOM%29/KeyboardEvent and SDL_keycode.h
      38:  1106, // up arrow
      40:  1105, // down arrow
      37:  1104, // left arrow
      39:  1103, // right arrow

      33: 1099, // pagedup
      34: 1102, // pagedown

      17:  305, // control (right, or left)
      18:  308, // alt
      109: 45, // minus
      16:  304, // shift
      
      96: 88 | 1<<10, // keypad 0
      97: 89 | 1<<10, // keypad 1
      98: 90 | 1<<10, // keypad 2
      99: 91 | 1<<10, // keypad 3
      100: 92 | 1<<10, // keypad 4
      101: 93 | 1<<10, // keypad 5
      102: 94 | 1<<10, // keypad 6
      103: 95 | 1<<10, // keypad 7
      104: 96 | 1<<10, // keypad 8
      105: 97 | 1<<10, // keypad 9

      112: 58 | 1<<10, // F1
      113: 59 | 1<<10, // F2
      114: 60 | 1<<10, // F3
      115: 61 | 1<<10, // F4
      116: 62 | 1<<10, // F5
      117: 63 | 1<<10, // F6
      118: 64 | 1<<10, // F7
      119: 65 | 1<<10, // F8
      120: 66 | 1<<10, // F9
      121: 67 | 1<<10, // F10
      122: 68 | 1<<10