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/*************************************************************************/
/* javascript_main.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "core/io/resource_loader.h"
#include "main/main.h"
#include "platform/javascript/display_server_javascript.h"
#include "platform/javascript/os_javascript.h"
#include <emscripten/emscripten.h>
#include <stdlib.h>
static OS_JavaScript *os = nullptr;
static uint64_t target_ticks = 0;
void exit_callback() {
emscripten_cancel_main_loop(); // After this, we can exit!
Main::cleanup();
int exit_code = OS_JavaScript::get_singleton()->get_exit_code();
memdelete(os);
os = nullptr;
emscripten_force_exit(exit_code); // No matter that we call cancel_main_loop, regular "exit" will not work, forcing.
}
void main_loop_callback() {
uint64_t current_ticks = os->get_ticks_usec();
bool force_draw = DisplayServerJavaScript::get_singleton()->check_size_force_redraw();
if (force_draw) {
Main::force_redraw();
} else if (current_ticks < target_ticks) {
return; // Skip frame.
}
int target_fps = Engine::get_singleton()->get_target_fps();
if (target_fps > 0) {
target_ticks += (uint64_t)(1000000 / target_fps);
}
if (os->main_loop_iterate()) {
emscripten_cancel_main_loop(); // Cancel current loop and wait for finalize_async.
/* clang-format off */
EM_ASM({
// This will contain the list of operations that need to complete before cleanup.
Module.async_finish = [
// Always contains at least one async promise, to avoid firing immediately if nothing is added.
new Promise(function(accept, reject) {
setTimeout(accept, 0);
})
];
});
/* clang-format on */
os->get_main_loop()->finish();
os->finalize_async(); // Will add all the async finish functions.
EM_ASM({
Promise.all(Module.async_finish).then(function() {
Module.async_finish = [];
ccall("cleanup_after_sync", null, []);
});
});
}
}
extern "C" EMSCRIPTEN_KEEPALIVE void cleanup_after_sync() {
emscripten_set_main_loop(exit_callback, -1, false);
}
extern "C" EMSCRIPTEN_KEEPALIVE void main_after_fs_sync(char *p_idbfs_err) {
String idbfs_err = String::utf8(p_idbfs_err);
if (!idbfs_err.empty()) {
print_line("IndexedDB not available: " + idbfs_err);
}
os->set_idb_available(idbfs_err.empty());
// TODO: Check error return value.
Main::setup2(); // Manual second phase.
// Ease up compatibility.
ResourceLoader::set_abort_on_missing_resources(false);
Main::start();
os->get_main_loop()->init();
// Immediately run the first iteration.
// We are inside an animation frame, we want to immediately draw on the newly setup canvas.
main_loop_callback();
emscripten_resume_main_loop();
}
int main(int argc, char *argv[]) {
// Create and mount userfs immediately.
EM_ASM({
FS.mkdir('/userfs');
FS.mount(IDBFS, {}, '/userfs');
});
// Configure locale.
char locale_ptr[16];
/* clang-format off */
EM_ASM({
stringToUTF8(Module['locale'], $0, 16);
}, locale_ptr);
/* clang-format on */
setenv("LANG", locale_ptr, true);
// Ensure the canvas ID.
/* clang-format off */
EM_ASM({
stringToUTF8("#" + Module['canvas'].id, $0, 255);
}, DisplayServerJavaScript::canvas_id);
/* clang-format on */
os = new OS_JavaScript();
// We must override main when testing is enabled
TEST_MAIN_OVERRIDE
Main::setup(argv[0], argc - 1, &argv[1], false);
emscripten_set_main_loop(main_loop_callback, -1, false);
emscripten_pause_main_loop(); // Will need to wait for FS sync.
// Sync from persistent state into memory and then
// run the 'main_after_fs_sync' function.
/* clang-format off */
EM_ASM({
FS.syncfs(true, function(err) {
requestAnimationFrame(function() {
ccall('main_after_fs_sync', null, ['string'], [err ? err.message : ""]);
});
});
});
/* clang-format on */
return 0;
// Continued async in main_after_fs_sync() from the syncfs() callback.
}
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