Atlas - SDL_sysmain_runapp.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12
13  1. The origin of this software must not be misrepresented; you must not
14     claim that you wrote the original software. If you use this software
15     in a product, an acknowledgment in the product documentation would be
16     appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18     misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20*/
21#include "SDL_internal.h"
22
23#ifdef SDL_PLATFORM_EMSCRIPTEN
24
25#include "../SDL_main_callbacks.h"
26
27#include <emscripten/emscripten.h>
28
29EM_JS_DEPS(sdlrunapp, "$dynCall,$stringToNewUTF8");
30
31// even though we reference the C runtime's free() in other places, it appears
32// to be inlined more aggressively in Emscripten 4, so we need a reference to
33// it here, too, so the inlined Javascript doesn't fail to find it.
34EMSCRIPTEN_KEEPALIVE void force_free(void *ptr) { free(ptr); } // This should NOT be SDL_free()
35
36int SDL_RunApp(int argc, char *argv[], SDL_main_func mainFunction, void * reserved)
37{
38    (void)reserved;
39
40    // Move any URL params that start with "SDL_" over to environment
41    //  variables, so the hint system can pick them up, etc, much like a user
42    //  can set them from a shell prompt on a desktop machine. Ignore all
43    //  other params, in case the app wants to use them for something.
44    MAIN_THREAD_EM_ASM({
45        var parms = new URLSearchParams(window.location.search);
46        for (const [key, value] of parms) {
47            if (key.startsWith("SDL_")) {
48                var ckey = stringToNewUTF8(key);
49                var cvalue = stringToNewUTF8(value);
50                if ((ckey != 0) && (cvalue != 0)) {
51                    //console.log("Setting SDL env var '" + key + "' to '" + value + "' ...");
52                    dynCall('iiii', $0, [ckey, cvalue, 1]);
53                }
54                _force_free(ckey);  // these must use free(), not SDL_free()!
55                _force_free(cvalue);
56            }
57        }
58    }, SDL_setenv_unsafe);
59
60    return SDL_CallMainFunction(argc, argv, mainFunction);
61}
62
63#endif
64
[FILE END]
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