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#ifndef __emscripten_h__
#define __emscripten_h__
* This file contains a few useful things for compiling C/C++ code
* with Emscripten.
* Documentation for the public APIs defined in this file must be updated in:
* site/source/docs/api_reference/emscripten.h.rst
* A prebuilt local version of the documentation is available at:
* site/build/text/docs/api_reference/emscripten.h.txt
* You can also build docs locally as HTML or other formats in site/
* An online HTML version (which may be of a different version of Emscripten)
* is up at
#include "em_asm.h"
#include "em_js.h"
#ifdef __cplusplus
extern "C" {
#include <stdio.h>
#include <SDL/SDL.h> /* for SDL_Delay in async_call */
// This version of emscripten has <emscripten/vr.h> and associated support
/* Typedefs */
typedef short __attribute__((aligned(1))) emscripten_align1_short;
typedef long long __attribute__((aligned(4))) emscripten_align4_int64;
typedef long long __attribute__((aligned(2))) emscripten_align2_int64;
typedef long long __attribute__((aligned(1))) emscripten_align1_int64;
typedef int __attribute__((aligned(2))) emscripten_align2_int;
typedef int __attribute__((aligned(1))) emscripten_align1_int;
typedef float __attribute__((aligned(2))) emscripten_align2_float;
typedef float __attribute__((aligned(1))) emscripten_align1_float;
typedef double __attribute__((aligned(4))) emscripten_align4_double;
typedef double __attribute__((aligned(2))) emscripten_align2_double;
typedef double __attribute__((aligned(1))) emscripten_align1_double;
typedef void (*em_callback_func)(void);
typedef void (*em_arg_callback_func)(void*);
typedef void (*em_str_callback_func)(const char *);
#define EMSCRIPTEN_KEEPALIVE __attribute__((used))
extern void emscripten_run_script(const char *script);
extern int emscripten_run_script_int(const char *script);
extern char *emscripten_run_script_string(const char *script);
extern void emscripten_async_run_script(const char *script, int millis);
extern void emscripten_async_load_script(const char *script, em_callback_func onload, em_callback_func onerror);
extern void emscripten_set_main_loop(em_callback_func func, int fps, int simulate_infinite_loop);
#define EM_TIMING_RAF 1
extern int emscripten_set_main_loop_timing(int mode, int value);
extern void emscripten_get_main_loop_timing(int *mode, int *value);
extern void emscripten_set_main_loop_arg(em_arg_callback_func func, void *arg, int fps, int simulate_infinite_loop);
extern void emscripten_pause_main_loop(void);
extern void emscripten_resume_main_loop(void);
extern void emscripten_cancel_main_loop(void);
#define emscripten_set_main_loop(func, fps, simulateInfiniteLoop) \
while (1) { func(); usleep(1000000/fps); }
#define emscripten_cancel_main_loop() exit(1);
typedef void (*em_socket_callback)(int fd, void *userData);
typedef void (*em_socket_error_callback)(int fd, int err, const char* msg, void *userData);
extern void emscripten_set_socket_error_callback(void *userData, em_socket_error_callback callback);
extern void emscripten_set_socket_open_callback(void *userData, em_socket_callback callback);
extern void emscripten_set_socket_listen_callback(void *userData, em_socket_callback callback);
extern void emscripten_set_socket_connection_callback(void *userData, em_socket_callback callback);
extern void emscripten_set_socket_message_callback(void *userData, em_socket_callback callback);
extern void emscripten_set_socket_close_callback(void *userData, em_socket_callback callback);
extern void _emscripten_push_main_loop_blocker(em_arg_callback_func func, void *arg, const char *name);
extern void _emscripten_push_uncounted_main_loop_blocker(em_arg_callback_func func, void *arg, const char *name);
inline void _emscripten_push_main_loop_blocker(em_arg_callback_func func, void *arg, const char *name) {
inline void _emscripten_push_uncounted_main_loop_blocker(em_arg_callback_func func, void *arg, const char *name) {
#define emscripten_push_main_loop_blocker(func, arg) \
_emscripten_push_main_loop_blocker(func, arg, #func)
#define emscripten_push_uncounted_main_loop_blocker(func, arg) \
_emscripten_push_uncounted_main_loop_blocker(func, arg, #func)
extern void emscripten_set_main_loop_expected_blockers(int num);
inline void emscripten_set_main_loop_expected_blockers(int num) {}
extern void emscripten_async_call(em_arg_callback_func func, void *arg, int millis);
inline void emscripten_async_call(em_arg_callback_func func, void *arg, int millis) {
if (millis) SDL_Delay(millis);
extern void emscripten_exit_with_live_runtime(void);
extern void emscripten_force_exit(int status);
double emscripten_get_device_pixel_ratio(void);
void emscripten_hide_mouse(void);
void emscripten_set_canvas_size(int width, int height) __attribute__((deprecated("This variant does not allow specifying the target canvas", "Use emscripten_set_canvas_element_size() instead")));
void emscripten_get_canvas_size(int *width, int *height, int *isFullscreen) __attribute__((deprecated("This variant does not allow specifying the target canvas", "Use emscripten_get_canvas_element_size() and emscripten_get_fullscreen_status() instead")));
double emscripten_get_now(void);
#include <time.h>
static inline double emscripten_get_now(void) {
return (1000*clock())/(double)CLOCKS_PER_SEC;
float emscripten_random(void);
// wget
void emscripten_async_wget(const char* url, const char* file, em_str_callback_func onload, em_str_callback_func onerror);
typedef void (*em_async_wget_onload_func)(void*, void*, int);
void emscripten_async_wget_data(const char* url, void *arg, em_async_wget_onload_func onload, em_arg_callback_func onerror);
typedef void (*em_async_wget2_onload_func)(unsigned, void*, const char*);
typedef void (*em_async_wget2_onstatus_func)(unsigned, void*, int);
int emscripten_async_wget2(const char* url, const char* file, const char* requesttype, const char* param, void *arg, em_async_wget2_onload_func onload, em_async_wget2_onstatus_func onerror, em_async_wget2_onstatus_func onprogress);
typedef void (*em_async_wget2_data_onload_func)(unsigned, void*, void*, unsigned);
typedef void (*em_async_wget2_data_onerror_func)(unsigned, void*, int, const char*);
typedef void (*em_async_wget2_data_onprogress_func)(unsigned, void*, int, int);
int emscripten_async_wget2_data(const char* url, const char* requesttype, const char* param, void *arg, int free, em_async_wget2_data_onload_func onload, em_async_wget2_data_onerror_func onerror, em_async_wget2_data_onprogress_func onprogress);
void emscripten_async_wget2_abort(int handle);
// wget "sync" (ASYNCIFY)
void emscripten_wget(const char* url, const char* file);
// wget data "sync" (EMTERPRETIFY_ASYNC)
void emscripten_wget_data(const char* url, void** pbuffer, int* pnum, int *perror);
// IDB
void emscripten_idb_async_load(const char *db_name, const char *file_id, void* arg, em_async_wget_onload_func onload, em_arg_callback_func onerror);
void emscripten_idb_async_store(const char *db_name, const char *file_id, void* ptr, int num, void* arg, em_arg_callback_func onstore, em_arg_callback_func onerror);
void emscripten_idb_async_delete(const char *db_name, const char *file_id, void* arg, em_arg_callback_func ondelete, em_arg_callback_func onerror);
typedef void (*em_idb_exists_func)(void*, int);
void emscripten_idb_async_exists(const char *db_name, const char *file_id, void* arg, em_idb_exists_func oncheck, em_arg_callback_func onerror);
void emscripten_idb_load(const char *db_name, const char *file_id, void** pbuffer, int* pnum, int *perror);
void emscripten_idb_store(const char *db_name, const char *file_id, void* buffer, int num, int *perror);
void emscripten_idb_delete(const char *db_name, const char *file_id, int *perror);
void emscripten_idb_exists(const char *db_name, const char *file_id, int* pexists, int *perror);
void emscripten_idb_load_blob(const char *db_name, const char *file_id, int* pblob, int *perror);
void emscripten_idb_store_blob(const char *db_name, const char *file_id, void* buffer, int num, int *perror);
void emscripten_idb_read_from_blob(int blob, int start, int num, void* buffer);
void emscripten_idb_free_blob(int blob);
// other async utilities
int emscripten_run_preload_plugins(const char* file, em_str_callback_func onload, em_str_callback_func onerror);
typedef void (*em_run_preload_plugins_data_onload_func)(void*, const char*);
void emscripten_run_preload_plugins_data(char* data, int size, const char *suffix, void *arg, em_run_preload_plugins_data_onload_func onload, em_arg_callback_func onerror);
// show an error on some renamed methods
#define emscripten_async_prepare(...) _Pragma("GCC error(\"emscripten_async_prepare has been replaced by emscripten_run_preload_plugins\")")
#define emscripten_async_prepare_data(...) _Pragma("GCC error(\"emscripten_async_prepare_data has been replaced by emscripten_run_preload_plugins_data\")")
// worker APIs
typedef int worker_handle;
worker_handle emscripten_create_worker(const char *url);
void emscripten_destroy_worker(worker_handle worker);
typedef void (*em_worker_callback_func)(char*, int, void*);
void emscripten_call_worker(worker_handle worker, const char *funcname, char *data, int size, em_worker_callback_func callback, void *arg);
void emscripten_worker_respond(char *data, int size);
void emscripten_worker_respond_provisionally(char *data, int size);
int emscripten_get_worker_queue_size(worker_handle worker);
// misc.
int emscripten_get_compiler_setting(const char *name);
void emscripten_debugger(void);
char *emscripten_get_preloaded_image_data(const char *path, int *w, int *h);
char *emscripten_get_preloaded_image_data_from_FILE(FILE *file, int *w, int *h);
#define EM_LOG_CONSOLE 1
#define EM_LOG_WARN 2
#define EM_LOG_ERROR 4
#define EM_LOG_C_STACK 8
#define EM_LOG_JS_STACK 16
#define EM_LOG_DEMANGLE 32
#define EM_LOG_NO_PATHS 64
#define EM_LOG_FUNC_PARAMS 128
void emscripten_log(int flags, ...);
int emscripten_get_callstack(int flags, char *out, int maxbytes);
int emscripten_print_double(double x, char *to, signed max);
/* ===================================== */
/* Internal APIs. Be careful with these. */
/* ===================================== */
void emscripten_sleep(unsigned int ms);
void emscripten_sleep_with_yield(unsigned int ms);
#define emscripten_sleep SDL_Delay
typedef void * emscripten_coroutine;
emscripten_coroutine emscripten_coroutine_create(em_arg_callback_func func, void *arg, int stack_size);
int emscripten_coroutine_next(emscripten_coroutine);
void emscripten_yield(void);
#ifdef __cplusplus
#endif // __emscripten_h__