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RetroArch/frontend/drivers/platform_emscripten.c

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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>
#include <string.h>
#include <malloc.h>
#include <stdio.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"
#ifdef HAVE_WASMFS
#include <emscripten/wasmfs.h>
#endif
#ifdef PROXY_TO_PTHREAD
#include <emscripten/threading.h>
#include <emscripten/proxying.h>
#include <emscripten/atomic.h>
#define PLATFORM_SETVAL(type, addr, val) emscripten_atomic_store_##type(addr, val)
#define PLATFORM_GETVAL(type, addr) emscripten_atomic_load_##type(addr)
#else
#define PLATFORM_SETVAL(type, addr, val) *addr = val
#define PLATFORM_GETVAL(type, addr) *addr
#endif
void emscripten_mainloop(void);
void PlatformEmscriptenWatchCanvasSizeAndDpr(double *dpr);
void PlatformEmscriptenWatchWindowVisibility(void);
void PlatformEmscriptenPowerStateInit(void);
void PlatformEmscriptenMemoryUsageInit(void);
typedef struct
{
uint64_t memory_used;
uint64_t memory_limit;
double device_pixel_ratio;
int canvas_width;
int canvas_height;
int power_state_discharge_time;
float power_state_level;
volatile bool power_state_charging;
volatile bool power_state_supported;
volatile bool window_hidden;
volatile bool command_flag;
} emscripten_platform_data_t;
static emscripten_platform_data_t *emscripten_platform_data = NULL;
/* 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);
}
/* javascript callbacks */
void update_canvas_dimensions(int width, int height, double *dpr)
{
printf("[INFO] Setting real canvas size: %d x %d\n", width, height);
emscripten_set_canvas_element_size("#canvas", width, height);
if (!emscripten_platform_data)
return;
PLATFORM_SETVAL(u32, &emscripten_platform_data->canvas_width, width);
PLATFORM_SETVAL(u32, &emscripten_platform_data->canvas_height, height);
PLATFORM_SETVAL(f64, &emscripten_platform_data->device_pixel_ratio, *dpr);
}
void update_window_hidden(bool hidden)
{
if (!emscripten_platform_data)
return;
emscripten_platform_data->window_hidden = hidden;
}
void update_power_state(bool supported, int discharge_time, float level, bool charging)
{
if (!emscripten_platform_data)
return;
emscripten_platform_data->power_state_supported = supported;
emscripten_platform_data->power_state_charging = charging;
PLATFORM_SETVAL(u32, &emscripten_platform_data->power_state_discharge_time, discharge_time);
PLATFORM_SETVAL(f32, &emscripten_platform_data->power_state_level, level);
}
void update_memory_usage(uint32_t used1, uint32_t used2, uint32_t limit1, uint32_t limit2)
{
if (!emscripten_platform_data)
return;
PLATFORM_SETVAL(u64, &emscripten_platform_data->memory_used, used1 | ((uint64_t)used2 << 32));
PLATFORM_SETVAL(u64, &emscripten_platform_data->memory_limit, limit1 | ((uint64_t)limit2 << 32));
}
void PlatformEmscriptenCommandRaiseFlag()
{
if (!emscripten_platform_data)
return;
emscripten_platform_data->command_flag = true;
}
/* platform specific c helpers */
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);
}
size_t PlatformEmscriptenCommandRead(char **into, size_t max_len)
{
if (!emscripten_platform_data || !emscripten_platform_data->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;
}, &emscripten_platform_data->command_flag, into, max_len);
}
void platform_emscripten_get_canvas_size(int *width, int *height)
{
if (!emscripten_platform_data)
goto error;
*width = PLATFORM_GETVAL(u32, &emscripten_platform_data->canvas_width);
*height = PLATFORM_GETVAL(u32, &emscripten_platform_data->canvas_height);
if (*width != 0 || *height != 0)
return;
error:
*width = 800;
*height = 600;
RARCH_ERR("[EMSCRIPTEN]: Could not get screen dimensions!\n");
}
double platform_emscripten_get_dpr(void)
{
return PLATFORM_GETVAL(f64, &emscripten_platform_data->device_pixel_ratio);
}
bool platform_emscripten_is_window_hidden(void)
{
return emscripten_platform_data->window_hidden;
}
void platform_emscripten_run_on_browser_thread_sync(void (*func)(void*), void* arg)
{
#ifdef PROXY_TO_PTHREAD
emscripten_proxy_sync(emscripten_proxy_get_system_queue(), emscripten_main_runtime_thread_id(), func, arg);
#else
func(arg);
#endif
}
void platform_emscripten_run_on_browser_thread_async(void (*func)(void*), void* arg)
{
#ifdef PROXY_TO_PTHREAD
emscripten_proxy_async(emscripten_proxy_get_system_queue(), emscripten_main_runtime_thread_id(), func, arg);
#else
// for now, not async
func(arg);
#endif
}
/* frontend driver impl */
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];
char bundle_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);
#ifndef HAVE_WASMFS
/* can be removed when the new web player replaces the old one */
_len = strlcpy(user_path, home, sizeof(user_path));
strlcpy(user_path + _len, "/retroarch/userdata", sizeof(user_path) - _len);
_len = strlcpy(bundle_path, home, sizeof(bundle_path));
strlcpy(bundle_path + _len, "/retroarch/bundle", sizeof(bundle_path) - _len);
#else
_len = strlcpy(user_path, home, sizeof(user_path));
strlcpy(user_path + _len, "/retroarch", sizeof(user_path) - _len);
_len = strlcpy(bundle_path, home, sizeof(bundle_path));
strlcpy(bundle_path + _len, "/retroarch", sizeof(bundle_path) - _len);
#endif
}
else
{
strlcpy(base_path, "retroarch", sizeof(base_path));
#ifndef HAVE_WASMFS
/* can be removed when the new web player replaces the old one */
strlcpy(user_path, "retroarch/userdata", sizeof(user_path));
strlcpy(bundle_path, "retroarch/bundle", sizeof(bundle_path));
#else
strlcpy(user_path, "retroarch", sizeof(user_path));
strlcpy(bundle_path, "retroarch", sizeof(bundle_path));
#endif
}
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], bundle_path,
"assets", sizeof(g_defaults.dirs[DEFAULT_DIR_ASSETS]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_AUTOCONFIG], bundle_path,
"autoconfig", sizeof(g_defaults.dirs[DEFAULT_DIR_AUTOCONFIG]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_DATABASE], bundle_path,
"database/rdb", sizeof(g_defaults.dirs[DEFAULT_DIR_DATABASE]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_CORE_INFO], bundle_path,
"info", sizeof(g_defaults.dirs[DEFAULT_DIR_CORE_INFO]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_OVERLAY], bundle_path,
"overlays", sizeof(g_defaults.dirs[DEFAULT_DIR_OVERLAY]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_OSK_OVERLAY], bundle_path,
"overlays/keyboards", sizeof(g_defaults.dirs[DEFAULT_DIR_OSK_OVERLAY]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_SHADER], bundle_path,
"shaders", sizeof(g_defaults.dirs[DEFAULT_DIR_SHADER]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_AUDIO_FILTER], bundle_path,
"filters/audio", sizeof(g_defaults.dirs[DEFAULT_DIR_AUDIO_FILTER]));
fill_pathname_join(g_defaults.dirs[DEFAULT_DIR_VIDEO_FILTER], bundle_path,
"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,
"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
}
static enum frontend_powerstate frontend_emscripten_get_powerstate(int *seconds, int *percent)
{
enum frontend_powerstate ret = FRONTEND_POWERSTATE_NONE;
int level;
if (!emscripten_platform_data || !emscripten_platform_data->power_state_supported)
return ret;
level = PLATFORM_GETVAL(f32, &emscripten_platform_data->power_state_level);
if (!emscripten_platform_data->power_state_charging)
ret = FRONTEND_POWERSTATE_ON_POWER_SOURCE;
else if (level == 1)
ret = FRONTEND_POWERSTATE_CHARGED;
else
ret = FRONTEND_POWERSTATE_CHARGING;
*seconds = PLATFORM_GETVAL(u32, &emscripten_platform_data->power_state_discharge_time);
*percent = (int)(level * 100);
return ret;
}
static uint64_t frontend_emscripten_get_total_mem(void)
{
if (!emscripten_platform_data)
return 0;
return PLATFORM_GETVAL(u64, &emscripten_platform_data->memory_limit);
}
static uint64_t frontend_emscripten_get_free_mem(void)
{
if (!emscripten_platform_data)
return 0;
#ifndef PROXY_TO_PTHREAD
uint64_t used = PLATFORM_GETVAL(u64, &emscripten_platform_data->memory_used);
#else
uint64_t used = mallinfo().uordblks;
#endif
return (PLATFORM_GETVAL(u64, &emscripten_platform_data->memory_limit) - used);
}
/* program entry and startup */
#ifdef HAVE_WASMFS
void platform_emscripten_mount_filesystems(void)
{
char *opfs_mount = getenv("OPFS_MOUNT");
char *fetch_manifest = getenv("FETCH_MANIFEST");
char *fetch_base_dir = getenv("FETCH_BASE_DIR");
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_base_dir)
{
/* fetch_manifest should be a path to a manifest file.
manifest files have this format:
BASEURL
URL PATH
URL PATH
URL PATH
...
Where URL may not contain spaces, but PATH may.
URL segments are relative to BASEURL.
*/
int max_line_len = 1024;
if (!(fetch_manifest && fetch_base_dir))
printf("[FetchFS] must specify both FETCH_MANIFEST and FETCH_BASE_DIR\n");
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;
if (getline(&line, &len, file) == -1 || len == 0)
printf("[FetchFS] missing base URL, skipping fetch initialization\n");
else
{
char *base_url = strdup(line);
backend_t fetch;
// Don't create fetch backend unless manifest actually has entries
while (getline(&line, &len, file) != -1)
{
if (!fetch)
{
fetch = wasmfs_create_fetch_backend(base_url, 16*1024*1024);
wasmfs_create_directory(fetch_base_dir, 0777, fetch);
}
char *realfs_path = strstr(line, " "), *url = line;
int fd;
if(len <= 2 || !realfs_path)
{
printf("[FetchFS] Manifest file has invalid line %s\n",line);
continue;
}
*realfs_path = '\0';
realfs_path += 1;
realfs_path[strcspn(realfs_path, "\r\n")] = '\0';
printf("[FetchFS] Fetch %s from URL %s / %s, fetched path %s / %s\n", realfs_path, base_url, url, fetch_base_dir, url);
char fetchfs_path[PATH_MAX];
fill_pathname_join(fetchfs_path, fetch_base_dir, url, sizeof(fetchfs_path));
/* Make the directories for link path */
{
char *parent = strdup(realfs_path);
path_parent_dir(parent, strlen(parent));
if(!path_mkdir(parent)) {
printf("[FetchFS] mkdir error %s %d\n", realfs_path, errno);
abort();
}
free(parent);
}
/* Make the directories for URL path */
{
char *parent = strdup(fetchfs_path);
path_parent_dir(parent, strlen(parent));
if(!path_mkdir(parent)) {
printf("[FetchFS] mkdir error %s %d\n", fetchfs_path, errno);
abort();
}
free(parent);
}
fd = open(fetchfs_path, O_CREAT);
if(!fd) {
printf("[FetchFS] couldn't create fetch file %s\n", fetchfs_path);
abort();
}
close(fd);
if(symlink(fetchfs_path, realfs_path) != 0) {
printf("[FetchFS] couldn't create link %s to fetch file %s (errno %d)\n", realfs_path, fetchfs_path, errno);
abort();
}
len = max_line_len;
}
free(base_url);
}
fclose(file);
free(line);
}
}
#endif /* HAVE_WASMFS */
static int thread_main(int argc, char *argv[])
{
#ifdef HAVE_WASMFS
platform_emscripten_mount_filesystems();
#endif
emscripten_set_main_loop(emscripten_mainloop, 0, 0);
emscripten_set_main_loop_timing(EM_TIMING_RAF, 1);
rarch_main(argc, argv, NULL);
return 0;
}
#ifdef PROXY_TO_PTHREAD
static int _main_argc;
static char** _main_argv;
static void *main_pthread(void* arg)
{
emscripten_set_thread_name(pthread_self(), "Application main thread");
thread_main(_main_argc, _main_argv);
return NULL;
}
#endif
int main(int argc, char *argv[])
{
int ret = 0;
#ifdef PROXY_TO_PTHREAD
pthread_attr_t attr;
pthread_t thread;
#endif
// this never gets freed
emscripten_platform_data = (emscripten_platform_data_t *)calloc(1, sizeof(emscripten_platform_data_t));
PlatformEmscriptenWatchCanvasSizeAndDpr(malloc(sizeof(double)));
PlatformEmscriptenWatchWindowVisibility();
PlatformEmscriptenPowerStateInit();
PlatformEmscriptenMemoryUsageInit();
#ifdef PROXY_TO_PTHREAD
_main_argc = argc;
_main_argv = argv;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
pthread_attr_setstacksize(&attr, EMSCRIPTEN_STACK_SIZE);
emscripten_pthread_attr_settransferredcanvases(&attr, (const char*)-1);
ret = pthread_create(&thread, &attr, main_pthread, NULL);
pthread_attr_destroy(&attr);
#else
ret = thread_main(argc, argv);
#endif
return ret;
}
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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