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//"use strict";
// Utilities for browser environments
mergeInto(LibraryManager.library, {
emscripten_set_main_loop: function(func, fps) {
fps = fps || 60; // TODO: use requestAnimationFrame
_emscripten_set_main_loop.cancel = false;
var jsFunc = FUNCTION_TABLE[func];
function doOne() {
if (_emscripten_set_main_loop.cancel) return;
jsFunc();
setTimeout(doOne, 1000/fps); // doing this each time means that on exception, we stop
}
setTimeout(doOne, 1000/fps);
},
emscripten_cancel_main_loop: function(func) {
_emscripten_set_main_loop.cancel = true;
},
$Browser: {
createContext: function(canvas, useWebGL) {
#if !USE_TYPED_ARRAYS
if (useWebGL) {
Module.print('(USE_TYPED_ARRAYS needs to be enabled for WebGL)');
return null;
}
#endif
try {
var ctx = canvas.getContext(useWebGL ? 'experimental-webgl' : '2d');
if (!ctx) throw ':(';
} catch (e) {
Module.print('Could not create canvas - ' + e);
return null;
}
if (useWebGL) {
#if GL_DEBUG
// Useful to debug native webgl apps: var Module = { printErr: function(x) { console.log(x) } };
var tempCtx = ctx;
var wrapper = {};
wrapper.objectMap = new WeakMap();
wrapper.objectCounter = 1;
for (var prop in tempCtx) {
(function(prop) {
switch (typeof tempCtx[prop]) {
case 'function': {
wrapper[prop] = function() {
var printArgs = Array.prototype.slice.call(arguments).map(function(arg) {
if (!arg) return arg;
if (wrapper.objectMap[arg]) return '<' + arg + '|' + wrapper.objectMap[arg] + '>';
if (arg.toString() == '[object HTMLImageElement]') {
return arg + '\n\n';
}
if (arg.byteLength) {
return '{' + Array.prototype.slice.call(arg, 0, Math.min(arg.length, 40)) + '}'; // Useful for correct arrays, less so for compiled arrays, see the code below for that
var buf = new ArrayBuffer(32);
var i8buf = new Int8Array(buf);
var i16buf = new Int16Array(buf);
var f32buf = new Float32Array(buf);
switch(arg.toString()) {
case '[object Uint8Array]':
i8buf.set(arg.subarray(0, 32));
break;
case '[object Float32Array]':
f32buf.set(arg.subarray(0, 5));
break;
case '[object Uint16Array]':
i16buf.set(arg.subarray(0, 16));
break;
default:
alert('unknown array for debugging: ' + arg);
throw 'see alert';
}
var ret = '{' + arg.byteLength + ':\n';
var arr = Array.prototype.slice.call(i8buf);
ret += 'i8:' + arr.toString().replace(/,/g, ',') + '\n';
arr = Array.prototype.slice.call(f32buf, 0, 8);
ret += 'f32:' + arr.toString().replace(/,/g, ',') + '}';
return ret;
}
return arg;
});
console.log('[gl_f:' + prop + ':' + printArgs + ']');
var ret = tempCtx[prop].apply(tempCtx, arguments);
var printRet = ret;
if (typeof ret == 'object') {
wrapper.objectMap[ret] = wrapper.objectCounter++;
printRet = '<' + ret + '|' + wrapper.objectMap[ret] + '>';
}
if (typeof printRet != 'undefined') console.log('[ gl:' + prop + ':return:' + printRet + ']');
return ret;
}
break;
}
case 'number': case 'string': {
wrapper.__defineGetter__(prop, function() {
//console.log('[gl_g:' + prop + ':' + tempCtx[prop] + ']');
return tempCtx[prop];
});
wrapper.__defineSetter__(prop, function(value) {
console.log('[gl_s:' + prop + ':' + value + ']');
tempCtx[prop] = value;
});
break;
}
}
})(prop);
}
ctx = wrapper;
#endif
// Set the background of the WebGL canvas to black
canvas.style.backgroundColor = "black";
}
return ctx;
},
// Given binary data for an image, in a format like PNG or JPG, we convert it
// to flat pixel data. We do so using the browser's native code.
// This is deprecated, it is preferred to load binary files, createObjectURL, etc.,
// see the sdl_* tests.
/*decodeImage: function(pixels, format) {
function encodeBase64(data) {
var BASE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
var PAD = '=';
var ret = '';
var leftchar = 0;
var leftbits = 0;
for (var i = 0; i < data.length; i++) {
leftchar = (leftchar << 8) | data[i];
leftbits += 8;
while (leftbits >= 6) {
var curr = (leftchar >> (leftbits-6)) & 0x3f;
leftbits -= 6;
ret += BASE[curr];
}
}
if (leftbits == 2) {
ret += BASE[(leftchar&3) << 4];
ret += PAD + PAD;
} else if (leftbits == 4) {
ret += BASE[(leftchar&0xf) << 2];
ret += PAD;
}
return ret;
}
var image = new Image();
image.src = 'data:image/' + format + ';base64,' + encodeBase64(pixels);
assert(image.complete, 'Image could not be decoded'); // page reload might fix it, decoding is async... need .onload handler...
var canvas = document.createElement('canvas');
canvas.width = image.width;
canvas.height = image.height;
var ctx = canvas.getContext('2d');
ctx.drawImage(image, 0, 0);
var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
return imageData;
},*/
}
});
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