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This commit is contained in:
Nitload
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_internal.h"
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#include "../SDL_main_callbacks.h"
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#include <emscripten.h>
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// For Emscripten, we let you use SDL_HINT_MAIN_CALLBACK_RATE, because it might be useful to drop it super-low for
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// things like loopwave that don't really do much but wait on the audio device, but be warned that browser timers
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// are super-unreliable in modern times, so you likely won't hit your desired callback rate with good precision.
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// Almost all apps should leave this alone, so we can use requestAnimationFrame, which is intended to run reliably
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// at the refresh rate of the user's display.
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static Uint32 callback_rate_increment = 0;
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static bool iterate_after_waitevent = false;
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static bool callback_rate_changed = false;
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static void SDLCALL MainCallbackRateHintChanged(void *userdata, const char *name, const char *oldValue, const char *newValue)
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{
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callback_rate_changed = true;
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iterate_after_waitevent = newValue && (SDL_strcmp(newValue, "waitevent") == 0);
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if (iterate_after_waitevent) {
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callback_rate_increment = 0;
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} else {
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const double callback_rate = newValue ? SDL_atof(newValue) : 0.0;
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if (callback_rate > 0.0) {
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callback_rate_increment = (Uint32) SDL_NS_TO_MS((double) SDL_NS_PER_SECOND / callback_rate);
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} else {
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callback_rate_increment = 0;
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}
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}
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}
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// just tell us when any new event is pushed on the queue, so we can check a flag for "waitevent" mode.
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static bool saw_new_event = false;
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static bool SDLCALL EmscriptenMainCallbackEventWatcher(void *userdata, SDL_Event *event)
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{
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saw_new_event = true;
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return true;
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}
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static void EmscriptenInternalMainloop(void)
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{
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// callback rate changed? Update emscripten's mainloop iteration speed.
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if (callback_rate_changed) {
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callback_rate_changed = false;
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if (callback_rate_increment == 0) {
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emscripten_set_main_loop_timing(EM_TIMING_RAF, 1);
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} else {
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emscripten_set_main_loop_timing(EM_TIMING_SETTIMEOUT, callback_rate_increment);
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}
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}
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if (iterate_after_waitevent) {
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SDL_PumpEvents();
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if (!saw_new_event) {
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// do nothing yet. Note that we're still going to iterate here because we can't block,
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// but we can stop the app's iteration from progressing until there's an event.
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return;
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}
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saw_new_event = false;
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}
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const SDL_AppResult rc = SDL_IterateMainCallbacks(!iterate_after_waitevent);
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if (rc != SDL_APP_CONTINUE) {
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SDL_QuitMainCallbacks(rc);
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emscripten_cancel_main_loop(); // kill" the mainloop, so it stops calling back into it.
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exit((rc == SDL_APP_FAILURE) ? 1 : 0); // hopefully this takes down everything else, too.
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}
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}
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int SDL_EnterAppMainCallbacks(int argc, char *argv[], SDL_AppInit_func appinit, SDL_AppIterate_func appiter, SDL_AppEvent_func appevent, SDL_AppQuit_func appquit)
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{
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SDL_AppResult rc = SDL_InitMainCallbacks(argc, argv, appinit, appiter, appevent, appquit);
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if (rc == SDL_APP_CONTINUE) {
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if (!SDL_AddEventWatch(EmscriptenMainCallbackEventWatcher, NULL)) {
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rc = SDL_APP_FAILURE;
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} else {
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SDL_AddHintCallback(SDL_HINT_MAIN_CALLBACK_RATE, MainCallbackRateHintChanged, NULL);
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callback_rate_changed = false;
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emscripten_set_main_loop(EmscriptenInternalMainloop, 0, 0); // don't throw an exception since we do an orderly return.
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if (callback_rate_increment > 0.0) {
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emscripten_set_main_loop_timing(EM_TIMING_SETTIMEOUT, callback_rate_increment);
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}
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}
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} else {
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SDL_QuitMainCallbacks(rc);
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}
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return (rc == SDL_APP_FAILURE) ? 1 : 0;
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}
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@@ -0,0 +1,56 @@
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_internal.h"
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#ifdef SDL_PLATFORM_EMSCRIPTEN
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#include <emscripten/emscripten.h>
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EM_JS_DEPS(sdlrunapp, "$dynCall,$stringToNewUTF8");
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int SDL_RunApp(int argc, char *argv[], SDL_main_func mainFunction, void * reserved)
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{
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(void)reserved;
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// Move any URL params that start with "SDL_" over to environment
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// variables, so the hint system can pick them up, etc, much like a user
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// can set them from a shell prompt on a desktop machine. Ignore all
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// other params, in case the app wants to use them for something.
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MAIN_THREAD_EM_ASM({
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var parms = new URLSearchParams(window.location.search);
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for (const [key, value] of parms) {
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if (key.startsWith("SDL_")) {
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var ckey = stringToNewUTF8(key);
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var cvalue = stringToNewUTF8(value);
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if ((ckey != 0) && (cvalue != 0)) {
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//console.log("Setting SDL env var '" + key + "' to '" + value + "' ...");
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dynCall('iiii', $0, [ckey, cvalue, 1]);
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}
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_free(ckey); // these must use free(), not SDL_free()!
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_free(cvalue);
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}
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}
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}, SDL_setenv_unsafe);
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return mainFunction(argc, argv);
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}
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#endif
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