/
executor_emscripten.c
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/
executor_emscripten.c
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/*
* This software is licensed under the terms of the MIT-License
* See COPYING for further information.
* ---
* Copyright (c) 2011-2019, Lukas Weber <laochailan@web.de>.
* Copyright (c) 2012-2019, Andrei Alexeyev <akari@taisei-project.org>.
*/
#include "taisei.h"
#include "eventloop_private.h"
#include "events.h"
#include "global.h"
#include <emscripten.h>
static FrameTimes frame_times;
static uint frame_num;
static bool em_handle_resize_event(SDL_Event *event, void *arg);
static void em_loop_callback(void) {
LoopFrame *frame = evloop.stack_ptr;
if(!frame) {
events_unregister_handler(em_handle_resize_event);
emscripten_cancel_main_loop();
return;
}
if(time_get() < frame_times.next) {
return;
}
frame_times.start = time_get();
frame_times.target = frame->frametime;
frame_times.next += frame_times.target;
hrtime_t min_next_time = frame_times.start - 2 * frame_times.target;
if(min_next_time > frame_times.next) {
frame_times.next = min_next_time;
}
global.fps.busy.last_update_time = frame_times.start;
LogicFrameAction lframe_action = handle_logic(&frame, &frame_times);
if(!frame || lframe_action == LFRAME_STOP) {
return;
}
if(!(frame_num++ % get_effective_frameskip())) {
run_render_frame(frame);
}
fpscounter_update(&global.fps.busy);
}
static void update_vsync(void) {
switch(config_get_int(CONFIG_VSYNC)) {
case 0: r_vsync(VSYNC_NONE); break;
default: r_vsync(VSYNC_NORMAL); break;
}
}
static bool em_handle_resize_event(SDL_Event *event, void *arg) {
emscripten_cancel_main_loop();
emscripten_set_main_loop(em_loop_callback, 0, false);
update_vsync();
return false;
}
static bool em_audio_workaround(SDL_Event *event, void *arg) {
// Workaround for Chromium:
// https://github.com/emscripten-core/emscripten/issues/6511
// Will start playing audio as soon as the first input occurs.
(__extension__ EM_ASM({
var sdl2 = Module['SDL2'];
if(sdl2 !== undefined) {
var audioctx = sdl2.audioContext;
if(audioctx !== undefined) {
audioctx.resume();
}
}
}));
events_unregister_handler(em_audio_workaround);
return false;
}
void eventloop_run(void) {
frame_times.next = time_get();
emscripten_set_main_loop(em_loop_callback, 0, false);
update_vsync();
events_register_handler(&(EventHandler) {
em_audio_workaround, NULL, EPRIO_SYSTEM, SDL_KEYDOWN,
});
events_register_handler(&(EventHandler) {
em_handle_resize_event, NULL, EPRIO_SYSTEM, MAKE_TAISEI_EVENT(TE_VIDEO_MODE_CHANGED)
});
(__extension__ EM_ASM({
Module['onFirstFrame']();
}));
}