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RetroArch/frontend/drivers/platform_emscripten.c
Joe Osborn c413bcc626
Threaded emscripten fixes (#17614) 
* Actually read CLI args in emscripten

* Fix fetchfs manifest parsing, increase download chunk size

The chunk size should probably be made a parameter in the future.  The
larger chunk size trades longer hitches for fewer hitches.

* Add exec command driver and API functions for emscripten.

Under WASMFS, stdin/stdout can't be customized the way they can with
the JS FS implementation.  Also, this approach frees up stdin/stdout
and simplifies interaction with the command interface for web embedders.

* fixup upload paths, show use of new emscripten cmd interface

* Add JS library function names to EXPORTS as well as EXPORTED_FUNCTIONS for older emsdk versions
2025-02-24 09:25:05 -08:00

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/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2017 - Daniel De Matteis
* Copyright (C) 2012-2015 - Michael Lelli
*
* RetroArch is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include <emscripten/emscripten.h>
#include <emscripten/html5.h>
#if HAVE_WASMFS
#include <emscripten/wasmfs.h>
#endif
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <file/config_file.h>
#include <queues/task_queue.h>
#include <file/file_path.h>
#include <string/stdstring.h>
#include <retro_timers.h>
#include <gfx/video_frame.h>
#include <glsym/glsym.h>
#ifdef HAVE_CONFIG_H
#include "../../config.h"
#endif
#ifndef IS_SALAMANDER
#include <lists/file_list.h>
#endif
#include "../frontend.h"
#include "../frontend_driver.h"
#include "../../configuration.h"
#include "../../content.h"
#include "../../command.h"
#include "../../defaults.h"
#include "../../file_path_special.h"
#include "../../paths.h"
#include "../../retroarch.h"
#include "../../verbosity.h"
#include "../../tasks/tasks_internal.h"
#include "../../cheat_manager.h"
#include "../../audio/audio_driver.h"
void emscripten_mainloop(void);
void PlatformEmscriptenWatchCanvasSize(void) {
MAIN_THREAD_ASYNC_EM_ASM(
RPE.observer = new ResizeObserver(function(_e) {
var container = Module.canvas.parentElement;
var width = container.offsetWidth;
var height = container.offsetHeight;
var w = Module.canvas.width;
var h = Module.canvas.height;
if (w == 0 || h == 0 || width == 0 || height == 0) { return; }
/* Module.print("Setting real canvas size: " + width + " x " + height); */
var new_w = `${width}px`;
var new_h = `${height}px`;
if (Module.canvas.style.width != new_w || Module.canvas.style.height != new_h) {
Module.canvas.style.width = new_w;
Module.canvas.style.height = new_h;
}
if (!Module.canvas.controlTransferredOffscreen) {
Module.Browser.setCanvasSize(width, height);
}
});
RPE.observer.observe(Module.canvas.parentElement);
window.addEventListener("resize", function(e) {
RPE.observer.unobserve(Module.canvas.parentElement);
RPE.observer.observe(Module.canvas.parentElement);
}, false);
);
}
void PlatformEmscriptenPowerStateInit(void);
bool PlatformEmscriptenPowerStateGetSupported(void);
int PlatformEmscriptenPowerStateGetDischargeTime(void);
float PlatformEmscriptenPowerStateGetLevel(void);
bool PlatformEmscriptenPowerStateGetCharging(void);
uint64_t PlatformEmscriptenGetTotalMem(void);
uint64_t PlatformEmscriptenGetFreeMem(void);
void PlatformEmscriptenCommandReply(const char *msg, size_t len) {
MAIN_THREAD_EM_ASM({
var message = UTF8ToString($0,$1);
RPE.command_reply_queue.push(message);
}, msg, len);
}
static bool command_flag = false;
size_t PlatformEmscriptenCommandRead(char **into, size_t max_len) {
if(!command_flag) { return 0; }
return MAIN_THREAD_EM_ASM_INT({
var next_command = RPE.command_queue.shift();
var length = lengthBytesUTF8(next_command);
if(length > $2) {
console.error("[CMD] Command too long, skipping",next_command);
return 0;
}
stringToUTF8(next_command, $1, $2);
if(RPE.command_queue.length == 0) {
setValue($0, 0, 'i8');
}
return length;
}, &command_flag, into, max_len);
}
void PlatformEmscriptenCommandRaiseFlag() {
command_flag = true;
}
/* begin exported functions */
/* saves and states */
void cmd_savefiles(void)
{
command_event(CMD_EVENT_SAVE_FILES, NULL);
}
void cmd_save_state(void)
{
command_event(CMD_EVENT_SAVE_STATE, NULL);
}
void cmd_load_state(void)
{
command_event(CMD_EVENT_LOAD_STATE, NULL);
}
void cmd_undo_save_state(void)
{
command_event(CMD_EVENT_UNDO_SAVE_STATE, NULL);
}
void cmd_undo_load_state(void)
{
command_event(CMD_EVENT_UNDO_LOAD_STATE, NULL);
}
/* misc */
void cmd_take_screenshot(void)
{
command_event(CMD_EVENT_TAKE_SCREENSHOT, NULL);
}
void cmd_toggle_menu(void)
{
command_event(CMD_EVENT_MENU_TOGGLE, NULL);
}
void cmd_reload_config(void)
{
command_event(CMD_EVENT_RELOAD_CONFIG, NULL);
}
void cmd_toggle_grab_mouse(void)
{
command_event(CMD_EVENT_GRAB_MOUSE_TOGGLE, NULL);
}
void cmd_toggle_game_focus(void)
{
command_event(CMD_EVENT_GAME_FOCUS_TOGGLE, NULL);
}
void cmd_reset(void)
{
command_event(CMD_EVENT_RESET, NULL);
}
void cmd_toggle_pause(void)
{
command_event(CMD_EVENT_PAUSE_TOGGLE, NULL);
}
void cmd_pause(void)
{
command_event(CMD_EVENT_PAUSE, NULL);
}
void cmd_unpause(void)
{
command_event(CMD_EVENT_UNPAUSE, NULL);
}
void cmd_set_volume(float volume)
{
audio_set_float(AUDIO_ACTION_VOLUME_GAIN, volume);
}
#if defined(HAVE_CG) || defined(HAVE_GLSL) || defined(HAVE_SLANG) || defined(HAVE_HLSL)
bool cmd_set_shader(const char *path)
{
return command_set_shader(NULL, path);
}
#endif
/* cheats */
void cmd_cheat_set_code(unsigned index, const char *str)
{
cheat_manager_set_code(index, str);
}
const char *cmd_cheat_get_code(unsigned index)
{
return cheat_manager_get_code(index);
}
void cmd_cheat_toggle_index(bool apply_cheats_after_toggle, unsigned index)
{
cheat_manager_toggle_index(apply_cheats_after_toggle,
config_get_ptr()->bools.notification_show_cheats_applied,
index);
}
bool cmd_cheat_get_code_state(unsigned index)
{
return cheat_manager_get_code_state(index);
}
bool cmd_cheat_realloc(unsigned new_size)
{
return cheat_manager_realloc(new_size, CHEAT_HANDLER_TYPE_EMU);
}
unsigned cmd_cheat_get_size(void)
{
return cheat_manager_get_size();
}
void cmd_cheat_apply_cheats(void)
{
cheat_manager_apply_cheats(
config_get_ptr()->bools.notification_show_cheats_applied);
}
/* end exported functions */
static void frontend_emscripten_get_env(int *argc, char *argv[],
void *args, void *params_data)
{
char base_path[PATH_MAX];
char user_path[PATH_MAX];
const char *home = getenv("HOME");
if (home)
{
size_t _len = strlcpy(base_path, home, sizeof(base_path));
strlcpy(base_path + _len, "/retroarch", sizeof(base_path) - _len);
_len = strlcpy(user_path, home, sizeof(user_path));
strlcpy(user_path + _len, "/retroarch/userdata", sizeof(user_path) - _len);
}
else
{
strlcpy(base_path, "retroarch", sizeof(base_path));
strlcpy(user_path, "retroarch/userdata", sizeof(user_path));
}
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_CORE], base_path,
"cores", sizeof(g_defaults.dirs[DEFAULT_DIR_CORE]));
/* bundle data */
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_ASSETS], base_path,
"bundle/assets", sizeof(g_defaults.dirs[DEFAULT_DIR_ASSETS]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_AUTOCONFIG], base_path,
"bundle/autoconfig", sizeof(g_defaults.dirs[DEFAULT_DIR_AUTOCONFIG]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_DATABASE], base_path,
"bundle/database/rdb", sizeof(g_defaults.dirs[DEFAULT_DIR_DATABASE]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_CORE_INFO], base_path,
"bundle/info", sizeof(g_defaults.dirs[DEFAULT_DIR_CORE_INFO]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_OVERLAY], base_path,
"bundle/overlays", sizeof(g_defaults.dirs[DEFAULT_DIR_OVERLAY]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_OSK_OVERLAY], base_path,
"bundle/overlays/keyboards", sizeof(g_defaults.dirs[DEFAULT_DIR_OSK_OVERLAY]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_SHADER], base_path,
"bundle/shaders", sizeof(g_defaults.dirs[DEFAULT_DIR_SHADER]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_AUDIO_FILTER], base_path,
"bundle/filters/audio", sizeof(g_defaults.dirs[DEFAULT_DIR_AUDIO_FILTER]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_VIDEO_FILTER], base_path,
"bundle/filters/video", sizeof(g_defaults.dirs[DEFAULT_DIR_VIDEO_FILTER]));
/* user data dirs */
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_CHEATS], user_path,
"cheats", sizeof(g_defaults.dirs[DEFAULT_DIR_CHEATS]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_MENU_CONFIG], user_path,
"config", sizeof(g_defaults.dirs[DEFAULT_DIR_MENU_CONFIG]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_MENU_CONTENT], user_path,
"content", sizeof(g_defaults.dirs[DEFAULT_DIR_MENU_CONTENT]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_CORE_ASSETS], user_path,
"content/downloads", sizeof(g_defaults.dirs[DEFAULT_DIR_CORE_ASSETS]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_PLAYLIST], user_path,
"playlists", sizeof(g_defaults.dirs[DEFAULT_DIR_PLAYLIST]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_REMAP], g_defaults.dirs[DEFAULT_DIR_MENU_CONFIG],
"remaps", sizeof(g_defaults.dirs[DEFAULT_DIR_REMAP]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_SRAM], user_path,
"saves", sizeof(g_defaults.dirs[DEFAULT_DIR_SRAM]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_SCREENSHOT], user_path,
"screenshots", sizeof(g_defaults.dirs[DEFAULT_DIR_SCREENSHOT]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_SAVESTATE], user_path,
"states", sizeof(g_defaults.dirs[DEFAULT_DIR_SAVESTATE]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_SYSTEM], user_path,
"system", sizeof(g_defaults.dirs[DEFAULT_DIR_SYSTEM]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_THUMBNAILS], user_path,
"thumbnails", sizeof(g_defaults.dirs[DEFAULT_DIR_THUMBNAILS]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_LOGS], user_path,
"logs", sizeof(g_defaults.dirs[DEFAULT_DIR_LOGS]));
/* cache dir */
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_CACHE], "/tmp/",
"retroarch", sizeof(g_defaults.dirs[DEFAULT_DIR_CACHE]));
/* history */
strlcpy(g_defaults.dirs[DEFAULT_DIR_CONTENT_HISTORY],
user_path, sizeof(g_defaults.dirs[DEFAULT_DIR_CONTENT_HISTORY]));
#ifndef IS_SALAMANDER
dir_check_defaults("custom.ini");
#endif
}
typedef struct args {
int argc;
char **argv;
} args_t;
static bool retro_started = false;
static bool filesystem_ready = false;
#if HAVE_WASMFS
void PlatformEmscriptenMountFilesystems(void *info) {
char *opfs_mount = getenv("OPFS");
char *fetch_manifest = getenv("FETCH_MANIFEST");
if(opfs_mount) {
int res;
printf("[OPFS] Mount OPFS at %s\n", opfs_mount);
backend_t opfs = wasmfs_create_opfs_backend();
{
char *parent = strdup(opfs_mount);
path_parent_dir(parent, strlen(parent));
if(!path_mkdir(parent)) {
printf("mkdir error %d\n",errno);
abort();
}
free(parent);
}
res = wasmfs_create_directory(opfs_mount, 0777, opfs);
if(res) {
printf("[OPFS] error result %d\n",res);
if(errno) {
printf("[OPFS] errno %d\n",errno);
abort();
}
abort();
}
}
if(fetch_manifest) {
/* fetch_manifest should be a path to a manifest file.
manifest files have this format:
URL PATH
URL PATH
URL PATH
...
Where URL may not contain spaces, but PATH may.
*/
int max_line_len = 1024;
printf("[FetchFS] read fetch manifest from %s\n",fetch_manifest);
FILE *file = fopen(fetch_manifest, "r");
if(!file) {
printf("[FetchFS] missing manifest file\n");
abort();
}
char *line = calloc(sizeof(char), max_line_len);
size_t len = max_line_len;
while (getline(&line, &len, file) != -1) {
char *path = strstr(line, " ");
backend_t fetch;
int fd;
if(len <= 2 || !path) {
printf("[FetchFS] Manifest file has invalid line %s\n",line);
continue;
}
*path = '\0';
path += 1;
path[strcspn(path, "\r\n")] = '\0';
printf("[FetchFS] Fetch %s from %s\n", path, line);
{
char *parent = strdup(path);
path_parent_dir(parent, strlen(parent));
if(!path_mkdir(parent)) {
printf("[FetchFS] mkdir error %d\n",errno);
abort();
}
free(parent);
}
fetch = wasmfs_create_fetch_backend(line, 16*1024*1024);
if(!fetch) {
printf("[FetchFS] couldn't create fetch backend\n");
abort();
}
fd = wasmfs_create_file(path, 0777, fetch);
if(!fd) {
printf("[FetchFS] couldn't create fetch file\n");
abort();
}
close(fd);
len = max_line_len;
}
fclose(file);
free(line);
}
filesystem_ready = true;
#if !PROXY_TO_PTHREAD
while (!retro_started) {
retro_sleep(1);
}
#endif
}
#endif /* HAVE_WASMFS */
static enum frontend_powerstate frontend_emscripten_get_powerstate(int *seconds, int *percent)
{
enum frontend_powerstate ret = FRONTEND_POWERSTATE_NONE;
if (!PlatformEmscriptenPowerStateGetSupported())
return ret;
if (!PlatformEmscriptenPowerStateGetCharging())
ret = FRONTEND_POWERSTATE_ON_POWER_SOURCE;
else if (PlatformEmscriptenPowerStateGetLevel() == 1)
ret = FRONTEND_POWERSTATE_CHARGED;
else
ret = FRONTEND_POWERSTATE_CHARGING;
*seconds = PlatformEmscriptenPowerStateGetDischargeTime();
*percent = (int)(PlatformEmscriptenPowerStateGetLevel() * 100);
return ret;
}
static uint64_t frontend_emscripten_get_total_mem(void)
{
return PlatformEmscriptenGetTotalMem();
}
static uint64_t frontend_emscripten_get_free_mem(void)
{
return PlatformEmscriptenGetFreeMem();
}
void emscripten_bootup_mainloop(void *argptr) {
if(filesystem_ready) {
args_t *args = (args_t*)argptr;
emscripten_set_main_loop(emscripten_mainloop, 0, 0);
emscripten_set_main_loop_timing(EM_TIMING_RAF, 1);
rarch_main(args->argc, args->argv, NULL);
retro_started = true;
free(args);
}
}
int main(int argc, char *argv[])
{
args_t *args = calloc(sizeof(args_t), 1);
args->argc = argc;
args->argv = argv;
PlatformEmscriptenWatchCanvasSize();
PlatformEmscriptenPowerStateInit();
emscripten_set_canvas_element_size("#canvas", 800, 600);
emscripten_set_element_css_size("#canvas", 800.0, 600.0);
#if HAVE_WASMFS
#if PROXY_TO_PTHREAD
{
PlatformEmscriptenMountFilesystems(NULL);
}
#else /* !PROXY_TO_PTHREAD */
{
sthread_t *thread = sthread_create(PlatformEmscriptenMountFilesystems, NULL);
sthread_detach(thread);
}
#endif /* PROXY_TO_PTHREAD */
#else /* !HAVE_WASMFS */
filesystem_ready = true;
#endif /* HAVE_WASMFS */
emscripten_set_main_loop_arg(emscripten_bootup_mainloop, (void *)args, 0, 0);
emscripten_set_main_loop_timing(EM_TIMING_RAF, 1);
return 0;
}
frontend_ctx_driver_t frontend_ctx_emscripten = {
frontend_emscripten_get_env, /* environment_get */
NULL, /* init */
NULL, /* deinit */
NULL, /* exitspawn */
NULL, /* process_args */
NULL, /* exec */
NULL, /* set_fork */
NULL, /* shutdown */
NULL, /* get_name */
NULL, /* get_os */
NULL, /* get_rating */
NULL, /* load_content */
NULL, /* get_architecture */
frontend_emscripten_get_powerstate, /* get_powerstate */
NULL, /* parse_drive_list */
frontend_emscripten_get_total_mem, /* get_total_mem */
frontend_emscripten_get_free_mem, /* get_free_mem */
NULL, /* install_sighandlers */
NULL, /* get_signal_handler_state */
NULL, /* set_signal_handler_state */
NULL, /* destroy_signal_handler_state */
NULL, /* attach_console */
NULL, /* detach_console */
NULL, /* get_lakka_version */
NULL, /* set_screen_brightness */
NULL, /* watch_path_for_changes */
NULL, /* check_for_path_changes */
NULL, /* set_sustained_performance_mode */
NULL, /* get_cpu_model_name */
NULL, /* get_user_language */
NULL, /* is_narrator_running */
NULL, /* accessibility_speak */
NULL, /* set_gamemode */
"emscripten", /* ident */
NULL /* get_video_driver */
};
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