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godot/platform/javascript/os_javascript.cpp

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/*************************************************************************/
/* os_javascript.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2018 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 "os_javascript.h"
#include "gles2/rasterizer_gles2.h"
#include "gles3/rasterizer_gles3.h"
#include "io/file_access_buffered_fa.h"
#include "main/main.h"
#include "servers/visual/visual_server_raster.h"
#include "unix/dir_access_unix.h"
#include "unix/file_access_unix.h"
#include <emscripten.h>
#include <stdlib.h>
#include "dom_keys.inc"
#define DOM_BUTTON_LEFT 0
#define DOM_BUTTON_MIDDLE 1
#define DOM_BUTTON_RIGHT 2
#define DOM_BUTTON_XBUTTON1 3
#define DOM_BUTTON_XBUTTON2 4
// Window (canvas)
static void focus_canvas() {
/* clang-format off */
EM_ASM(
Module.canvas.focus();
);
/* clang-format on */
}
static bool is_canvas_focused() {
/* clang-format off */
return EM_ASM_INT_V(
return document.activeElement == Module.canvas;
);
/* clang-format on */
}
static bool cursor_inside_canvas = true;
EM_BOOL OS_JavaScript::browser_resize_callback(int p_event_type, const EmscriptenUiEvent *p_event, void *p_user_data) {
// The order of the fullscreen change event and the window size change
// event varies, even within just one browser, so defer handling.
get_singleton()->canvas_size_adjustment_requested = true;
return false;
}
EM_BOOL OS_JavaScript::fullscreen_change_callback(int p_event_type, const EmscriptenFullscreenChangeEvent *p_event, void *p_user_data) {
OS_JavaScript *os = get_singleton();
// Empty ID is canvas.
String target_id = String::utf8(p_event->id);
if (target_id.empty() || target_id == "canvas") {
// This event property is the only reliable data on
// browser fullscreen state.
os->video_mode.fullscreen = p_event->isFullscreen;
os->canvas_size_adjustment_requested = true;
}
return false;
}
void OS_JavaScript::set_video_mode(const VideoMode &p_video_mode, int p_screen) {
video_mode = p_video_mode;
}
OS::VideoMode OS_JavaScript::get_video_mode(int p_screen) const {
return video_mode;
}
Size2 OS_JavaScript::get_screen_size(int p_screen) const {
EmscriptenFullscreenChangeEvent ev;
EMSCRIPTEN_RESULT result = emscripten_get_fullscreen_status(&ev);
ERR_FAIL_COND_V(result != EMSCRIPTEN_RESULT_SUCCESS, Size2());
return Size2(ev.screenWidth, ev.screenHeight);
}
void OS_JavaScript::set_window_size(const Size2 p_size) {
windowed_size = p_size;
if (is_window_fullscreen()) {
window_maximized = false;
set_window_fullscreen(false);
} else if (is_window_maximized()) {
set_window_maximized(false);
} else {
video_mode.width = p_size.x;
video_mode.height = p_size.y;
emscripten_set_canvas_size(p_size.x, p_size.y);
}
}
Size2 OS_JavaScript::get_window_size() const {
int canvas[3];
emscripten_get_canvas_size(canvas, canvas + 1, canvas + 2);
return Size2(canvas[0], canvas[1]);
}
void OS_JavaScript::set_window_maximized(bool p_enabled) {
window_maximized = p_enabled;
if (is_window_fullscreen()) {
set_window_fullscreen(false);
return;
}
// Calling emscripten_enter_soft_fullscreen mutltiple times hides all
// page elements except the canvas permanently, so track state.
if (p_enabled && !soft_fullscreen_enabled) {
EmscriptenFullscreenStrategy strategy;
strategy.scaleMode = EMSCRIPTEN_FULLSCREEN_SCALE_STRETCH;
strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_STDDEF;
strategy.filteringMode = EMSCRIPTEN_FULLSCREEN_FILTERING_DEFAULT;
strategy.canvasResizedCallback = NULL;
emscripten_enter_soft_fullscreen(NULL, &strategy);
soft_fullscreen_enabled = true;
video_mode.width = get_window_size().width;
video_mode.height = get_window_size().height;
} else if (!p_enabled) {
emscripten_exit_soft_fullscreen();
soft_fullscreen_enabled = false;
video_mode.width = windowed_size.width;
video_mode.height = windowed_size.height;
emscripten_set_canvas_size(video_mode.width, video_mode.height);
}
}
bool OS_JavaScript::is_window_maximized() const {
return window_maximized;
}
void OS_JavaScript::set_window_fullscreen(bool p_enabled) {
if (p_enabled == is_window_fullscreen()) {
return;
}
// Just request changes here, if successful, canvas is resized in
// _browser_resize_callback or _fullscreen_change_callback.
EMSCRIPTEN_RESULT result;
if (p_enabled) {
if (window_maximized) {
// Soft fullsreen during real fulllscreen can cause issues.
set_window_maximized(false);
window_maximized = true;
}
EmscriptenFullscreenStrategy strategy;
strategy.scaleMode = EMSCRIPTEN_FULLSCREEN_SCALE_STRETCH;
strategy.canvasResolutionScaleMode = EMSCRIPTEN_FULLSCREEN_CANVAS_SCALE_STDDEF;
strategy.filteringMode = EMSCRIPTEN_FULLSCREEN_FILTERING_DEFAULT;
strategy.canvasResizedCallback = NULL;
emscripten_request_fullscreen_strategy(NULL, false, &strategy);
} else {
result = emscripten_exit_fullscreen();
if (result != EMSCRIPTEN_RESULT_SUCCESS) {
ERR_PRINTS("Failed to exit fullscreen: Code " + itos(result));
}
}
}
bool OS_JavaScript::is_window_fullscreen() const {
return video_mode.fullscreen;
}
void OS_JavaScript::get_fullscreen_mode_list(List<VideoMode> *p_list, int p_screen) const {
Size2 screen = get_screen_size();
p_list->push_back(OS::VideoMode(screen.width, screen.height, true));
}
// Keys
template <typename T>
static void dom2godot_mod(T *emscripten_event_ptr, Ref<InputEventWithModifiers> godot_event) {
godot_event->set_shift(emscripten_event_ptr->shiftKey);
godot_event->set_alt(emscripten_event_ptr->altKey);
godot_event->set_control(emscripten_event_ptr->ctrlKey);
godot_event->set_metakey(emscripten_event_ptr->metaKey);
}
static Ref<InputEventKey> setup_key_event(const EmscriptenKeyboardEvent *emscripten_event) {
Ref<InputEventKey> ev;
ev.instance();
ev->set_echo(emscripten_event->repeat);
dom2godot_mod(emscripten_event, ev);
ev->set_scancode(dom2godot_scancode(emscripten_event->keyCode));
String unicode = String::utf8(emscripten_event->key);
// Check if empty or multi-character (e.g. `CapsLock`).
if (unicode.length() != 1) {
// Might be empty as well, but better than nonsense.
unicode = String::utf8(emscripten_event->charValue);
}
if (unicode.length() == 1) {
ev->set_unicode(unicode[0]);
}
return ev;
}
EM_BOOL OS_JavaScript::keydown_callback(int p_event_type, const EmscriptenKeyboardEvent *p_event, void *p_user_data) {
OS_JavaScript *os = get_singleton();
Ref<InputEventKey> ev = setup_key_event(p_event);
ev->set_pressed(true);
if (ev->get_unicode() == 0 && keycode_has_unicode(ev->get_scancode())) {
// Defer to keypress event for legacy unicode retrieval.
os->deferred_key_event = ev;
// Do not suppress keypress event.
return false;
}
os->input->parse_input_event(ev);
return true;
}
EM_BOOL OS_JavaScript::keypress_callback(int p_event_type, const EmscriptenKeyboardEvent *p_event, void *p_user_data) {
OS_JavaScript *os = get_singleton();
os->deferred_key_event->set_unicode(p_event->charCode);
os->input->parse_input_event(os->deferred_key_event);
return true;
}
EM_BOOL OS_JavaScript::keyup_callback(int p_event_type, const EmscriptenKeyboardEvent *p_event, void *p_user_data) {
Ref<InputEventKey> ev = setup_key_event(p_event);
ev->set_pressed(false);
get_singleton()->input->parse_input_event(ev);
return ev->get_scancode() != KEY_UNKNOWN && ev->get_scancode() != 0;
}
// Mouse
Point2 OS_JavaScript::get_mouse_position() const {
return input->get_mouse_position();
}
int OS_JavaScript::get_mouse_button_state() const {
return input->get_mouse_button_mask();
}
EM_BOOL OS_JavaScript::mouse_button_callback(int p_event_type, const EmscriptenMouseEvent *p_event, void *p_user_data) {
OS_JavaScript *os = get_singleton();
Ref<InputEventMouseButton> ev;
ev.instance();
ev->set_pressed(p_event_type == EMSCRIPTEN_EVENT_MOUSEDOWN);
ev->set_position(Point2(p_event->canvasX, p_event->canvasY));
ev->set_global_position(ev->get_position());
dom2godot_mod(p_event, ev);
switch (p_event->button) {
case DOM_BUTTON_LEFT: ev->set_button_index(BUTTON_LEFT); break;
case DOM_BUTTON_MIDDLE: ev->set_button_index(BUTTON_MIDDLE); break;
case DOM_BUTTON_RIGHT: ev->set_button_index(BUTTON_RIGHT); break;
case DOM_BUTTON_XBUTTON1: ev->set_button_index(BUTTON_XBUTTON1); break;
case DOM_BUTTON_XBUTTON2: ev->set_button_index(BUTTON_XBUTTON2); break;
default: return false;
}
int mask = os->input->get_mouse_button_mask();
int button_flag = 1 << (ev->get_button_index() - 1);
if (ev->is_pressed()) {
// Since the event is consumed, focus manually. The containing iframe,
// if exists, may not have focus yet, so focus even if already focused.
focus_canvas();
mask |= button_flag;
} else if (mask & button_flag) {
mask &= ~button_flag;
} else {
// Received release event, but press was outside the canvas, so ignore.
return false;
}
ev->set_button_mask(mask);
os->input->parse_input_event(ev);
// Prevent multi-click text selection and wheel-click scrolling anchor.
// Context menu is prevented through contextmenu event.
return true;
}
EM_BOOL OS_JavaScript::mousemove_callback(int p_event_type, const EmscriptenMouseEvent *p_event, void *p_user_data) {
OS_JavaScript *os = get_singleton();
int input_mask = os->input->get_mouse_button_mask();
Point2 pos = Point2(p_event->canvasX, p_event->canvasY);
// For motion outside the canvas, only read mouse movement if dragging
// started inside the canvas; imitating desktop app behaviour.
if (!cursor_inside_canvas && !input_mask)
return false;
Ref<InputEventMouseMotion> ev;
ev.instance();
dom2godot_mod(p_event, ev);
ev->set_button_mask(input_mask);
ev->set_position(pos);
ev->set_global_position(ev->get_position());
ev->set_relative(Vector2(p_event->movementX, p_event->movementY));
os->input->set_mouse_position(ev->get_position());
ev->set_speed(os->input->get_last_mouse_speed());
os->input->parse_input_event(ev);
// Don't suppress mouseover/-leave events.
return false;
}
static const char *godot2dom_cursor(OS::CursorShape p_shape) {
switch (p_shape) {
case OS::CURSOR_ARROW:
default:
return "auto";
case OS::CURSOR_IBEAM: return "text";
case OS::CURSOR_POINTING_HAND: return "pointer";
case OS::CURSOR_CROSS: return "crosshair";
case OS::CURSOR_WAIT: return "progress";
case OS::CURSOR_BUSY: return "wait";
case OS::CURSOR_DRAG: return "grab";
case OS::CURSOR_CAN_DROP: return "grabbing";
case OS::CURSOR_FORBIDDEN: return "no-drop";
case OS::CURSOR_VSIZE: return "ns-resize";
case OS::CURSOR_HSIZE: return "ew-resize";
case OS::CURSOR_BDIAGSIZE: return "nesw-resize";
case OS::CURSOR_FDIAGSIZE: return "nwse-resize";
case OS::CURSOR_MOVE: return "move";
case OS::CURSOR_VSPLIT: return "row-resize";
case OS::CURSOR_HSPLIT: return "col-resize";
case OS::CURSOR_HELP: return "help";
}
}
static void set_css_cursor(const char *p_cursor) {
/* clang-format off */
EM_ASM_({
Module.canvas.style.cursor = UTF8ToString($0);
}, p_cursor);
/* clang-format on */
}
static const char *get_css_cursor() {
char cursor[16];
/* clang-format off */
EM_ASM_INT({
stringToUTF8(Module.canvas.style.cursor ? Module.canvas.style.cursor : 'auto', $0, 16);
}, cursor);
/* clang-format on */
return cursor;
}
void OS_JavaScript::set_cursor_shape(CursorShape p_shape) {
ERR_FAIL_INDEX(p_shape, CURSOR_MAX);
cursor_shape = p_shape;
if (get_mouse_mode() != MOUSE_MODE_HIDDEN)
set_css_cursor(godot2dom_cursor(cursor_shape));
}
void OS_JavaScript::set_custom_mouse_cursor(const RES &p_cursor, CursorShape p_shape, const Vector2 &p_hotspot) {
}
void OS_JavaScript::set_mouse_mode(OS::MouseMode p_mode) {
ERR_EXPLAIN("MOUSE_MODE_CONFINED is not supported for the HTML5 platform");
ERR_FAIL_COND(p_mode == MOUSE_MODE_CONFINED);
if (p_mode == get_mouse_mode())
return;
if (p_mode == MOUSE_MODE_VISIBLE) {
set_css_cursor(godot2dom_cursor(cursor_shape));
emscripten_exit_pointerlock();
} else if (p_mode == MOUSE_MODE_HIDDEN) {
set_css_cursor("none");
emscripten_exit_pointerlock();
} else if (p_mode == MOUSE_MODE_CAPTURED) {
EMSCRIPTEN_RESULT result = emscripten_request_pointerlock("canvas", false);
ERR_EXPLAIN("MOUSE_MODE_CAPTURED can only be entered from within an appropriate input callback");
ERR_FAIL_COND(result == EMSCRIPTEN_RESULT_FAILED_NOT_DEFERRED);
ERR_FAIL_COND(result != EMSCRIPTEN_RESULT_SUCCESS);
set_css_cursor(godot2dom_cursor(cursor_shape));
}
}
OS::MouseMode OS_JavaScript::get_mouse_mode() const {
if (String::utf8(get_css_cursor()) == "none")
return MOUSE_MODE_HIDDEN;
EmscriptenPointerlockChangeEvent ev;
emscripten_get_pointerlock_status(&ev);
return (ev.isActive && String::utf8(ev.id) == "canvas") ? MOUSE_MODE_CAPTURED : MOUSE_MODE_VISIBLE;
}
// Wheel
EM_BOOL OS_JavaScript::wheel_callback(int p_event_type, const EmscriptenWheelEvent *p_event, void *p_user_data) {
ERR_FAIL_COND_V(p_event_type != EMSCRIPTEN_EVENT_WHEEL, false);
if (!is_canvas_focused()) {
if (cursor_inside_canvas) {
focus_canvas();
} else {
return false;
}
}
InputDefault *input = get_singleton()->input;
Ref<InputEventMouseButton> ev;
ev.instance();
ev->set_button_mask(input->get_mouse_button_mask());
ev->set_position(input->get_mouse_position());
ev->set_global_position(ev->get_position());
ev->set_shift(input->is_key_pressed(KEY_SHIFT));
ev->set_alt(input->is_key_pressed(KEY_ALT));
ev->set_control(input->is_key_pressed(KEY_CONTROL));
ev->set_metakey(input->is_key_pressed(KEY_META));
if (p_event->deltaY < 0)
ev->set_button_index(BUTTON_WHEEL_UP);
else if (p_event->deltaY > 0)
ev->set_button_index(BUTTON_WHEEL_DOWN);
else if (p_event->deltaX > 0)
ev->set_button_index(BUTTON_WHEEL_LEFT);
else if (p_event->deltaX < 0)
ev->set_button_index(BUTTON_WHEEL_RIGHT);
else
return false;
// Different browsers give wildly different delta values, and we can't
// interpret deltaMode, so use default value for wheel events' factor.
ev->set_pressed(true);
input->parse_input_event(ev);
ev->set_pressed(false);
input->parse_input_event(ev);
return true;
}
// Touch
bool OS_JavaScript::has_touchscreen_ui_hint() const {
/* clang-format off */
return EM_ASM_INT_V(
return 'ontouchstart' in window;
);
/* clang-format on */
}
EM_BOOL OS_JavaScript::touch_press_callback(int p_event_type, const EmscriptenTouchEvent *p_event, void *p_user_data) {
OS_JavaScript *os = get_singleton();
Ref<InputEventScreenTouch> ev;
ev.instance();
int lowest_id_index = -1;
for (int i = 0; i < p_event->numTouches; ++i) {
const EmscriptenTouchPoint &touch = p_event->touches[i];
if (lowest_id_index == -1 || touch.identifier < p_event->touches[lowest_id_index].identifier)
lowest_id_index = i;
if (!touch.isChanged)
continue;
ev->set_index(touch.identifier);
ev->set_position(Point2(touch.canvasX, touch.canvasY));
os->touches[i] = ev->get_position();
ev->set_pressed(p_event_type == EMSCRIPTEN_EVENT_TOUCHSTART);
os->input->parse_input_event(ev);
}
return true;
}
EM_BOOL OS_JavaScript::touchmove_callback(int p_event_type, const EmscriptenTouchEvent *p_event, void *p_user_data) {
OS_JavaScript *os = get_singleton();
Ref<InputEventScreenDrag> ev;
ev.instance();
int lowest_id_index = -1;
for (int i = 0; i < p_event->numTouches; ++i) {
const EmscriptenTouchPoint &touch = p_event->touches[i];
if (lowest_id_index == -1 || touch.identifier < p_event->touches[lowest_id_index].identifier)
lowest_id_index = i;
if (!touch.isChanged)
continue;
ev->set_index(touch.identifier);
ev->set_position(Point2(touch.canvasX, touch.canvasY));
Point2 &prev = os->touches[i];
ev->set_relative(ev->get_position() - prev);
prev = ev->get_position();
os->input->parse_input_event(ev);
}
return true;
}
// Gamepad
EM_BOOL OS_JavaScript::gamepad_change_callback(int p_event_type, const EmscriptenGamepadEvent *p_event, void *p_user_data) {
InputDefault *input = get_singleton()->input;
if (p_event_type == EMSCRIPTEN_EVENT_GAMEPADCONNECTED) {
String guid = "";
if (String::utf8(p_event->mapping) == "standard")
guid = "Default HTML5 Gamepad";
input->joy_connection_changed(p_event->index, true, String::utf8(p_event->id), guid);
} else {
input->joy_connection_changed(p_event->index, false, "");
}
return true;
}
void OS_JavaScript::process_joypads() {
int joypad_count = emscripten_get_num_gamepads();
for (int joypad = 0; joypad < joypad_count; joypad++) {
EmscriptenGamepadEvent state;
emscripten_get_gamepad_status(joypad, &state);
if (state.connected) {
int button_count = MIN(state.numButtons, 18);
int axis_count = MIN(state.numAxes, 8);
for (int button = 0; button < button_count; button++) {
float value = state.analogButton[button];
if (String::utf8(state.mapping) == "standard" && (button == JOY_ANALOG_L2 || button == JOY_ANALOG_R2)) {
InputDefault::JoyAxis joy_axis;
joy_axis.min = 0;
joy_axis.value = value;
input->joy_axis(joypad, button, joy_axis);
} else {
input->joy_button(joypad, button, value);
}
}
for (int axis = 0; axis < axis_count; axis++) {
InputDefault::JoyAxis joy_axis;
joy_axis.min = -1;
joy_axis.value = state.axis[axis];
input->joy_axis(joypad, axis, joy_axis);
}
}
}
}
bool OS_JavaScript::is_joy_known(int p_device) {
return input->is_joy_mapped(p_device);
}
String OS_JavaScript::get_joy_guid(int p_device) const {
return input->get_joy_guid_remapped(p_device);
}
// Video
int OS_JavaScript::get_video_driver_count() const {
return VIDEO_DRIVER_MAX;
}
const char *OS_JavaScript::get_video_driver_name(int p_driver) const {
switch (p_driver) {
case VIDEO_DRIVER_GLES3:
return "GLES3";
case VIDEO_DRIVER_GLES2:
return "GLES2";
}
ERR_EXPLAIN("Invalid video driver index " + itos(p_driver));
ERR_FAIL_V(NULL);
}
// Audio
int OS_JavaScript::get_audio_driver_count() const {
return 1;
}
const char *OS_JavaScript::get_audio_driver_name(int p_driver) const {
return "JavaScript";
}
// Lifecycle
void OS_JavaScript::initialize_core() {
OS_Unix::initialize_core();
FileAccess::make_default<FileAccessBufferedFA<FileAccessUnix> >(FileAccess::ACCESS_RESOURCES);
}
Error OS_JavaScript::initialize(const VideoMode &p_desired, int p_video_driver, int p_audio_driver) {
EmscriptenWebGLContextAttributes attributes;
emscripten_webgl_init_context_attributes(&attributes);
attributes.alpha = false;
attributes.antialias = false;
ERR_FAIL_INDEX_V(p_video_driver, VIDEO_DRIVER_MAX, ERR_INVALID_PARAMETER);
switch (p_video_driver) {
case VIDEO_DRIVER_GLES3:
attributes.majorVersion = 2;
RasterizerGLES3::register_config();
RasterizerGLES3::make_current();
break;
case VIDEO_DRIVER_GLES2:
attributes.majorVersion = 1;
RasterizerGLES2::register_config();
RasterizerGLES2::make_current();
break;
}
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx = emscripten_webgl_create_context(NULL, &attributes);
ERR_EXPLAIN("WebGL " + itos(attributes.majorVersion) + ".0 not available");
ERR_FAIL_COND_V(emscripten_webgl_make_context_current(ctx) != EMSCRIPTEN_RESULT_SUCCESS, ERR_UNAVAILABLE);
video_mode = p_desired;
// Can't fulfil fullscreen request during start-up due to browser security.
video_mode.fullscreen = false;
/* clang-format off */
if (EM_ASM_INT_V({ return Module.resizeCanvasOnStart })) {
/* clang-format on */
set_window_size(Size2(video_mode.width, video_mode.height));
} else {
set_window_size(get_window_size());
}
char locale_ptr[16];
/* clang-format off */
EM_ASM_ARGS({
stringToUTF8(Module.locale, $0, 16);
}, locale_ptr);
/* clang-format on */
setenv("LANG", locale_ptr, true);
AudioDriverManager::initialize(p_audio_driver);
VisualServer *visual_server = memnew(VisualServerRaster());
input = memnew(InputDefault);
EMSCRIPTEN_RESULT result;
#define EM_CHECK(ev) \
if (result != EMSCRIPTEN_RESULT_SUCCESS) \
ERR_PRINTS("Error while setting " #ev " callback: Code " + itos(result))
#define SET_EM_CALLBACK(target, ev, cb) \
result = emscripten_set_##ev##_callback(target, NULL, true, &cb); \
EM_CHECK(ev)
#define SET_EM_CALLBACK_NOTARGET(ev, cb) \
result = emscripten_set_##ev##_callback(NULL, true, &cb); \
EM_CHECK(ev)
// These callbacks from Emscripten's html5.h suffice to access most
// JavaScript APIs. For APIs that are not (sufficiently) exposed, EM_ASM
// is used below.
SET_EM_CALLBACK("#window", mousemove, mousemove_callback)
SET_EM_CALLBACK("#canvas", mousedown, mouse_button_callback)
SET_EM_CALLBACK("#window", mouseup, mouse_button_callback)
SET_EM_CALLBACK("#window", wheel, wheel_callback)
SET_EM_CALLBACK("#window", touchstart, touch_press_callback)
SET_EM_CALLBACK("#window", touchmove, touchmove_callback)
SET_EM_CALLBACK("#window", touchend, touch_press_callback)
SET_EM_CALLBACK("#window", touchcancel, touch_press_callback)
SET_EM_CALLBACK("#canvas", keydown, keydown_callback)
SET_EM_CALLBACK("#canvas", keypress, keypress_callback)
SET_EM_CALLBACK("#canvas", keyup, keyup_callback)
SET_EM_CALLBACK(NULL, resize, browser_resize_callback)
SET_EM_CALLBACK(NULL, fullscreenchange, fullscreen_change_callback)
SET_EM_CALLBACK_NOTARGET(gamepadconnected, gamepad_change_callback)
SET_EM_CALLBACK_NOTARGET(gamepaddisconnected, gamepad_change_callback)
#undef SET_EM_CALLBACK_NODATA
#undef SET_EM_CALLBACK
#undef EM_CHECK
/* clang-format off */
EM_ASM_ARGS({
const send_notification = cwrap('send_notification', null, ['number']);
const notifications = arguments;
(['mouseover', 'mouseleave', 'focus', 'blur']).forEach(function(event, index) {
Module.canvas.addEventListener(event, send_notification.bind(null, notifications[index]));
});
},
MainLoop::NOTIFICATION_WM_MOUSE_ENTER,
MainLoop::NOTIFICATION_WM_MOUSE_EXIT,
MainLoop::NOTIFICATION_WM_FOCUS_IN,
MainLoop::NOTIFICATION_WM_FOCUS_OUT
);
/* clang-format on */
visual_server->init();
return OK;
}
void OS_JavaScript::set_main_loop(MainLoop *p_main_loop) {
main_loop = p_main_loop;
input->set_main_loop(p_main_loop);
}
MainLoop *OS_JavaScript::get_main_loop() const {
return main_loop;
}
void OS_JavaScript::run_async() {
main_loop->init();
emscripten_set_main_loop(main_loop_callback, -1, false);
}
void OS_JavaScript::main_loop_callback() {
get_singleton()->main_loop_iterate();
}
bool OS_JavaScript::main_loop_iterate() {
if (is_userfs_persistent() && sync_wait_time >= 0) {
int64_t current_time = get_ticks_msec();
int64_t elapsed_time = current_time - last_sync_check_time;
last_sync_check_time = current_time;
sync_wait_time -= elapsed_time;
if (sync_wait_time < 0) {
/* clang-format off */
EM_ASM(
FS.syncfs(function(err) {
if (err) { Module.printErr('Failed to save IDB file system: ' + err.message); }
});
);
/* clang-format on */
}
}
process_joypads();
if (canvas_size_adjustment_requested) {
if (video_mode.fullscreen || window_maximized) {
video_mode.width = get_window_size().width;
video_mode.height = get_window_size().height;
}
if (!video_mode.fullscreen) {
set_window_maximized(window_maximized);
}
canvas_size_adjustment_requested = false;
}
return Main::iteration();
}
void OS_JavaScript::delete_main_loop() {
memdelete(main_loop);
}
void OS_JavaScript::finalize() {
memdelete(input);
}
// Miscellaneous
extern "C" EMSCRIPTEN_KEEPALIVE void send_notification(int p_notification) {
if (p_notification == MainLoop::NOTIFICATION_WM_MOUSE_ENTER || p_notification == MainLoop::NOTIFICATION_WM_MOUSE_EXIT) {
cursor_inside_canvas = p_notification == MainLoop::NOTIFICATION_WM_MOUSE_ENTER;
}
OS_JavaScript::get_singleton()->get_main_loop()->notification(p_notification);
}
bool OS_JavaScript::_check_internal_feature_support(const String &p_feature) {
if (p_feature == "HTML5" || p_feature == "web")
return true;
#ifdef JAVASCRIPT_EVAL_ENABLED
if (p_feature == "JavaScript")
return true;
#endif
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx = emscripten_webgl_get_current_context();
// All extensions are already automatically enabled, this function allows
// checking WebGL extension support without inline JavaScript
if (p_feature == "s3tc")
return emscripten_webgl_enable_extension(ctx, "WEBGL_compressed_texture_s3tc_srgb");
if (p_feature == "etc")
return emscripten_webgl_enable_extension(ctx, "WEBGL_compressed_texture_etc1");
if (p_feature == "etc2")
return emscripten_webgl_enable_extension(ctx, "WEBGL_compressed_texture_etc");
return false;
}
void OS_JavaScript::alert(const String &p_alert, const String &p_title) {
/* clang-format off */
EM_ASM_({
window.alert(UTF8ToString($0));
}, p_alert.utf8().get_data());
/* clang-format on */
}
void OS_JavaScript::set_window_title(const String &p_title) {
/* clang-format off */
EM_ASM_({
document.title = UTF8ToString($0);
}, p_title.utf8().get_data());
/* clang-format on */
}
String OS_JavaScript::get_executable_path() const {
return OS::get_executable_path();
}
Error OS_JavaScript::shell_open(String p_uri) {
// Open URI in a new tab, browser will deal with it by protocol.
/* clang-format off */
EM_ASM_({
window.open(UTF8ToString($0), '_blank');
}, p_uri.utf8().get_data());
/* clang-format on */
return OK;
}
String OS_JavaScript::get_name() {
return "HTML5";
}
bool OS_JavaScript::can_draw() const {
return true; // Always?
}
String OS_JavaScript::get_user_data_dir() const {
return "/userfs";
};
String OS_JavaScript::get_resource_dir() const {
return "/";
}
OS::PowerState OS_JavaScript::get_power_state() {
WARN_PRINT("Power management is not supported for the HTML5 platform, defaulting to POWERSTATE_UNKNOWN");
return OS::POWERSTATE_UNKNOWN;
}
int OS_JavaScript::get_power_seconds_left() {
WARN_PRINT("Power management is not supported for the HTML5 platform, defaulting to -1");
return -1;
}
int OS_JavaScript::get_power_percent_left() {
WARN_PRINT("Power management is not supported for the HTML5 platform, defaulting to -1");
return -1;
}
void OS_JavaScript::file_access_close_callback(const String &p_file, int p_flags) {
OS_JavaScript *os = get_singleton();
if (os->is_userfs_persistent() && p_file.begins_with("/userfs") && p_flags & FileAccess::WRITE) {
os->last_sync_check_time = OS::get_singleton()->get_ticks_msec();
// Wait five seconds in case more files are about to be closed.
os->sync_wait_time = 5000;
}
}
void OS_JavaScript::set_idb_available(bool p_idb_available) {
idb_available = p_idb_available;
}
bool OS_JavaScript::is_userfs_persistent() const {
return idb_available;
}
OS_JavaScript *OS_JavaScript::get_singleton() {
return static_cast<OS_JavaScript *>(OS::get_singleton());
}
OS_JavaScript::OS_JavaScript(int p_argc, char *p_argv[]) {
List<String> arguments;
for (int i = 1; i < p_argc; i++) {
arguments.push_back(String::utf8(p_argv[i]));
}
set_cmdline(p_argv[0], arguments);
window_maximized = false;
soft_fullscreen_enabled = false;
canvas_size_adjustment_requested = false;
main_loop = NULL;
idb_available = false;
sync_wait_time = -1;
AudioDriverManager::add_driver(&audio_driver_javascript);
Vector<Logger *> loggers;
loggers.push_back(memnew(StdLogger));
_set_logger(memnew(CompositeLogger(loggers)));
FileAccessUnix::close_notification_func = file_access_close_callback;
}
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