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Officially remove the Emscripten backend (#1159)

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1
CHANGELOG.md
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@ -8,6 +8,7 @@
- On Windows, add touch pressure information for touch events.
- On macOS, differentiate between `CursorIcon::Grab` and `CursorIcon::Grabbing`.
- On Wayland, fix event processing sometimes stalling when using OpenGL with vsync.
- Officially remove the Emscripten backend
# 0.20.0 Alpha 3 (2019-08-14)

69
FEATURES.md
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@ -12,7 +12,6 @@ be used to create both games and applications. It supports the main graphical pl
- iOS
- Android
- Web
- via Emscripten
- via WASM
Most platforms expose capabilities that cannot be meaningfully transposed onto others. Winit does not
@ -162,57 +161,57 @@ Legend:
- ❓: Unknown status
### Windowing
|Feature |Windows|MacOS |Linux x11 |Linux Wayland |Android|iOS |Emscripten|
|Feature |Windows|MacOS |Linux x11 |Linux Wayland |Android|iOS |WASM |
|-------------------------------- | ----- | ---- | ------- | ----------- | ----- | ----- | -------- |
|Window initialization |✔️ |✔️ |▢[#5] |✔️ |▢[#33]|▢[#33] |❓ |
|Providing pointer to init OpenGL |✔️ |✔️ |✔️ |✔️ |✔️ |✔️ |❓ |
|Providing pointer to init Vulkan |✔️ |✔️ |✔️ |✔️ |✔️ |❓ |**N/A** |
|Window decorations |✔️ |✔️ |✔️ |▢[#306] |**N/A**|**N/A**|**N/A** |
|Window decorations toggle |✔️ |✔️ |✔️ |✔️ |**N/A**|**N/A**|**N/A** |
|Providing pointer to init Vulkan |✔️ |✔️ |✔️ |✔️ |✔️ |❓ |❓ |
|Window decorations |✔️ |✔️ |✔️ |▢[#306] |**N/A**|**N/A**|❓ |
|Window decorations toggle |✔️ |✔️ |✔️ |✔️ |**N/A**|**N/A**|❓ |
|Window resizing |✔️ |▢[#219]|✔️ |▢[#306] |**N/A**|**N/A**|❓ |
|Window resize increments |❌ |❌ |❌ |❌ |❌ |❌ |❌ |
|Window transparency |✔️ |✔️ |✔️ |✔️ |**N/A**|**N/A**|**N/A** |
|Window maximization |✔️ |✔️ |✔️ |✔️ |**N/A**|**N/A**|**N/A** |
|Window maximization toggle |✔️ |✔️ |✔️ |✔️ |**N/A**|**N/A**|**N/A** |
|Fullscreen |✔️ |✔️ |✔️ |✔️ |**N/A**|✔️ |❌ |
|Fullscreen toggle |✔️ |✔️ |✔️ |✔️ |**N/A**|✔️ |❌ |
|Exclusive fullscreen |✔️ |✔️ |✔️ |**N/A** |❌ |✔️ |❌ |
|HiDPI support |✔️ |✔️ |✔️ |✔️ |▢[#721]|✔️ |✔️ |
|Popup windows |❌ |❌ |❌ |❌ |❌ |❌ |❌ |
|Window resize increments |❌ |❌ |❌ |❌ |❌ |❌ |❓ |
|Window transparency |✔️ |✔️ |✔️ |✔️ |**N/A**|**N/A**|❓ |
|Window maximization |✔️ |✔️ |✔️ |✔️ |**N/A**|**N/A**|❓ |
|Window maximization toggle |✔️ |✔️ |✔️ |✔️ |**N/A**|**N/A**|❓ |
|Fullscreen |✔️ |✔️ |✔️ |✔️ |**N/A**|✔️ |❓ |
|Fullscreen toggle |✔️ |✔️ |✔️ |✔️ |**N/A**|✔️ |❓ |
|Exclusive fullscreen |✔️ |✔️ |✔️ |**N/A** |❌ |✔️ |❓ |
|HiDPI support |✔️ |✔️ |✔️ |✔️ |▢[#721]|✔️ |❓ |
|Popup windows |❌ |❌ |❌ |❌ |❌ |❌ |❓ |
### System information
|Feature |Windows|MacOS |Linux x11|Linux Wayland|Android|iOS |Emscripten|
|---------------- | ----- | ---- | ------- | ----------- | ----- | ----- | -------- |
|Monitor list |✔️ |✔️ |✔️ |✔️ |**N/A**|✔️ |**N/A** |
|Video mode query |✔️ |✔️ |✔️ |✔️ |❌ |✔️ |❌ |
|Feature |Windows|MacOS |Linux x11|Linux Wayland|Android|iOS |WASM |
|---------------- | ----- | ---- | ------- | ----------- | ----- | ------- | -------- |
|Monitor list |✔️ |✔️ |✔️ |✔️ |**N/A**|✔️ |❓ |
|Video mode query |✔️ |✔️ |✔️ |✔️ |❌ |✔️ |❓ |
### Input handling
|Feature |Windows |MacOS |Linux x11|Linux Wayland|Android|iOS |Emscripten|
|Feature |Windows |MacOS |Linux x11|Linux Wayland|Android|iOS |WASM |
|----------------------- | ----- | ---- | ------- | ----------- | ----- | ----- | -------- |
|Mouse events |✔️ |▢[#63] |✔️ |✔️ |**N/A**|**N/A**|✔️ |
|Mouse set location |✔️ |✔️ |✔️ |❓ |**N/A**|**N/A**|**N/A** |
|Cursor grab |✔️ |▢[#165] |▢[#242] |❌[#306] |**N/A**|**N/A**|✔️ |
|Cursor icon |✔️ |✔️ |✔️ |❌[#306] |**N/A**|**N/A**|❌ |
|Touch events |✔️ |❌ |✔️ |✔️ |✔️ |✔️ |✔️ |
|Touch pressure |✔️ |❌ |❌ |❌ |❌ |✔️ |❌ |
|Multitouch |✔️ |❌ |✔️ |✔️ |❓ |✔️ |❌ |
|Keyboard events |✔️ |✔️ |✔️ |✔️ |❓ |❌ |✔️ |
|Mouse events |✔️ |▢[#63] |✔️ |✔️ |**N/A**|**N/A**|❓ |
|Mouse set location |✔️ |✔️ |✔️ |❓ |**N/A**|**N/A**|❓ |
|Cursor grab |✔️ |▢[#165] |▢[#242] |❌[#306] |**N/A**|**N/A**|❓ |
|Cursor icon |✔️ |✔️ |✔️ |❌[#306] |**N/A**|**N/A**|❓ |
|Touch events |✔️ |❌ |✔️ |✔️ |✔️ |✔️ |❓ |
|Touch pressure |✔️ |❌ |❌ |❌ |❌ |✔️ |❓ |
|Multitouch |✔️ |❌ |✔️ |✔️ |❓ |✔️ |❓ |
|Keyboard events |✔️ |✔️ |✔️ |✔️ |❓ |❌ |❓ |
|Drag & Drop |▢[#720] |▢[#720] |▢[#720] |❌[#306] |**N/A**|**N/A**|❓ |
|Raw Device Events |▢[#750] |▢[#750] |▢[#750] |❌ |❌ |❌ |❌ |
|Gamepad/Joystick events |❌[#804] |❌ |❌ |❌ |❌ |❌ |❌ |
|Device movement events |❓ |❓ |❓ |❓ |❌ |❌ |❌ |
|Raw Device Events |▢[#750] |▢[#750] |▢[#750] |❌ |❌ |❌ |❓ |
|Gamepad/Joystick events |❌[#804] |❌ |❌ |❌ |❌ |❌ |❓ |
|Device movement events |❓ |❓ |❓ |❓ |❌ |❌ |❓ |
### Pending API Reworks
Changes in the API that have been agreed upon but aren't implemented across all platforms.
|Feature |Windows|MacOS |Linux x11|Linux Wayland|Android|iOS |Emscripten|
|Feature |Windows|MacOS |Linux x11|Linux Wayland|Android|iOS |WASM |
|------------------------------ | ----- | ---- | ------- | ----------- | ----- | ----- | -------- |
|New API for HiDPI ([#315] [#319]) |✔️ |✔️ |✔️ |✔️ |▢[#721]|✔️ |✔️ |
|Event Loop 2.0 ([#459]) |✔️ |✔️ |❌ |✔️ |❌ |✔️ |❌ |
|Keyboard Input ([#812]) |❌ |❌ |❌ |❌ |❌ |❌ |❌ |
|New API for HiDPI ([#315] [#319]) |✔️ |✔️ |✔️ |✔️ |▢[#721]|✔️ |❓ |
|Event Loop 2.0 ([#459]) |✔️ |✔️ |❌ |✔️ |❌ |✔️ |❓ |
|Keyboard Input ([#812]) |❌ |❌ |❌ |❌ |❌ |❌ |❓ |
### Completed API Reworks
|Feature |Windows|MacOS |Linux x11|Linux Wayland|Android|iOS |Emscripten|
|Feature |Windows|MacOS |Linux x11|Linux Wayland|Android|iOS |WASM |
|------------------------------ | ----- | ---- | ------- | ----------- | ----- | ----- | -------- |
[#165]: https://github.com/rust-windowing/winit/issues/165

2
README.md
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@ -66,7 +66,7 @@ Winit provides the following features, which can be enabled in your `Cargo.toml`
### Platform-specific usage
#### Emscripten and WebAssembly
#### WebAssembly
Building a binary will yield a `.js` file. In order to use it in an HTML file, you need to:

2
examples/window_run_return.rs
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@ -50,7 +50,7 @@ fn main() {
println!("Okay we're done now for real.");
}
#[cfg(any(target_os = "ios", target_os = "android", target_os = "emscripten"))]
#[cfg(any(target_os = "ios", target_os = "android"))]
fn main() {
println!("This platform doesn't support run_return.");
}

363
src/platform_impl/emscripten/ffi.rs
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@ -1,363 +0,0 @@
#![allow(dead_code, non_camel_case_types, non_snake_case)]
#[cfg(test)]
use std::mem;
use std::os::raw::{c_char, c_double, c_int, c_long, c_ulong, c_ushort, c_void};
pub type EM_BOOL = c_int;
pub type EM_UTF8 = c_char;
pub type EMSCRIPTEN_RESULT = c_int;
pub const EM_TRUE: EM_BOOL = 1;
pub const EM_FALSE: EM_BOOL = 0;
// values for EMSCRIPTEN_RESULT
pub const EMSCRIPTEN_RESULT_SUCCESS: c_int = 0;
pub const EMSCRIPTEN_RESULT_DEFERRED: c_int = 1;
pub const EMSCRIPTEN_RESULT_NOT_SUPPORTED: c_int = -1;
pub const EMSCRIPTEN_RESULT_FAILED_NOT_DEFERRED: c_int = -2;
pub const EMSCRIPTEN_RESULT_INVALID_TARGET: c_int = -3;
pub const EMSCRIPTEN_RESULT_UNKNOWN_TARGET: c_int = -4;
pub const EMSCRIPTEN_RESULT_INVALID_PARAM: c_int = -5;
pub const EMSCRIPTEN_RESULT_FAILED: c_int = -6;
pub const EMSCRIPTEN_RESULT_NO_DATA: c_int = -7;
// values for EMSCRIPTEN EVENT
pub const EMSCRIPTEN_EVENT_KEYPRESS: c_int = 1;
pub const EMSCRIPTEN_EVENT_KEYDOWN: c_int = 2;
pub const EMSCRIPTEN_EVENT_KEYUP: c_int = 3;
pub const EMSCRIPTEN_EVENT_CLICK: c_int = 4;
pub const EMSCRIPTEN_EVENT_MOUSEDOWN: c_int = 5;
pub const EMSCRIPTEN_EVENT_MOUSEUP: c_int = 6;
pub const EMSCRIPTEN_EVENT_DBLCLICK: c_int = 7;
pub const EMSCRIPTEN_EVENT_MOUSEMOVE: c_int = 8;
pub const EMSCRIPTEN_EVENT_WHEEL: c_int = 9;
pub const EMSCRIPTEN_EVENT_RESIZE: c_int = 10;
pub const EMSCRIPTEN_EVENT_SCROLL: c_int = 11;
pub const EMSCRIPTEN_EVENT_BLUR: c_int = 12;
pub const EMSCRIPTEN_EVENT_FOCUS: c_int = 13;
pub const EMSCRIPTEN_EVENT_FOCUSIN: c_int = 14;
pub const EMSCRIPTEN_EVENT_FOCUSOUT: c_int = 15;
pub const EMSCRIPTEN_EVENT_DEVICEORIENTATION: c_int = 16;
pub const EMSCRIPTEN_EVENT_DEVICEMOTION: c_int = 17;
pub const EMSCRIPTEN_EVENT_ORIENTATIONCHANGE: c_int = 18;
pub const EMSCRIPTEN_EVENT_FULLSCREENCHANGE: c_int = 19;
pub const EMSCRIPTEN_EVENT_POINTERLOCKCHANGE: c_int = 20;
pub const EMSCRIPTEN_EVENT_VISIBILITYCHANGE: c_int = 21;
pub const EMSCRIPTEN_EVENT_TOUCHSTART: c_int = 22;
pub const EMSCRIPTEN_EVENT_TOUCHEND: c_int = 23;
pub const EMSCRIPTEN_EVENT_TOUCHMOVE: c_int = 24;
pub const EMSCRIPTEN_EVENT_TOUCHCANCEL: c_int = 25;
pub const EMSCRIPTEN_EVENT_GAMEPADCONNECTED: c_int = 26;
pub const EMSCRIPTEN_EVENT_GAMEPADDISCONNECTED: c_int = 27;
pub const EMSCRIPTEN_EVENT_BEFOREUNLOAD: c_int = 28;
pub const EMSCRIPTEN_EVENT_BATTERYCHARGINGCHANGE: c_int = 29;
pub const EMSCRIPTEN_EVENT_BATTERYLEVELCHANGE: c_int = 30;
pub const EMSCRIPTEN_EVENT_WEBGLCONTEXTLOST: c_int = 31;
pub const EMSCRIPTEN_EVENT_WEBGLCONTEXTRESTORED: c_int = 32;
pub const EMSCRIPTEN_EVENT_MOUSEENTER: c_int = 33;
pub const EMSCRIPTEN_EVENT_MOUSELEAVE: c_int = 34;
pub const EMSCRIPTEN_EVENT_MOUSEOVER: c_int = 35;
pub const EMSCRIPTEN_EVENT_MOUSEOUT: c_int = 36;
pub const EMSCRIPTEN_EVENT_CANVASRESIZED: c_int = 37;
pub const EMSCRIPTEN_EVENT_POINTERLOCKERROR: c_int = 38;
pub const EM_HTML5_SHORT_STRING_LEN_BYTES: usize = 32;
pub const DOM_KEY_LOCATION_STANDARD: c_ulong = 0x00;
pub const DOM_KEY_LOCATION_LEFT: c_ulong = 0x01;
pub const DOM_KEY_LOCATION_RIGHT: c_ulong = 0x02;
pub const DOM_KEY_LOCATION_NUMPAD: c_ulong = 0x03;
pub type em_callback_func = Option<unsafe extern "C" fn()>;
pub type em_key_callback_func = Option<
unsafe extern "C" fn(
eventType: c_int,
keyEvent: *const EmscriptenKeyboardEvent,
userData: *mut c_void,
) -> EM_BOOL,
>;
pub type em_mouse_callback_func = Option<
unsafe extern "C" fn(
eventType: c_int,
mouseEvent: *const EmscriptenMouseEvent,
userData: *mut c_void,
) -> EM_BOOL,
>;
pub type em_pointerlockchange_callback_func = Option<
unsafe extern "C" fn(
eventType: c_int,
pointerlockChangeEvent: *const EmscriptenPointerlockChangeEvent,
userData: *mut c_void,
) -> EM_BOOL,
>;
pub type em_fullscreenchange_callback_func = Option<
unsafe extern "C" fn(
eventType: c_int,
fullscreenChangeEvent: *const EmscriptenFullscreenChangeEvent,
userData: *mut c_void,
) -> EM_BOOL,
>;
pub type em_touch_callback_func = Option<
unsafe extern "C" fn(
eventType: c_int,
touchEvent: *const EmscriptenTouchEvent,
userData: *mut c_void,
) -> EM_BOOL,
>;
#[repr(C)]
pub struct EmscriptenFullscreenChangeEvent {
pub isFullscreen: c_int,
pub fullscreenEnabled: c_int,
pub nodeName: [c_char; 128usize],
pub id: [c_char; 128usize],
pub elementWidth: c_int,
pub elementHeight: c_int,
pub screenWidth: c_int,
pub screenHeight: c_int,
}
#[test]
fn bindgen_test_layout_EmscriptenFullscreenChangeEvent() {
assert_eq!(mem::size_of::<EmscriptenFullscreenChangeEvent>(), 280usize);
assert_eq!(mem::align_of::<EmscriptenFullscreenChangeEvent>(), 4usize);
}
#[repr(C)]
#[derive(Debug, Copy)]
pub struct EmscriptenKeyboardEvent {
pub key: [c_char; 32usize],
pub code: [c_char; 32usize],
pub location: c_ulong,
pub ctrlKey: c_int,
pub shiftKey: c_int,
pub altKey: c_int,
pub metaKey: c_int,
pub repeat: c_int,
pub locale: [c_char; 32usize],
pub charValue: [c_char; 32usize],
pub charCode: c_ulong,
pub keyCode: c_ulong,
pub which: c_ulong,
}
#[test]
fn bindgen_test_layout_EmscriptenKeyboardEvent() {
assert_eq!(mem::size_of::<EmscriptenKeyboardEvent>(), 184usize);
assert_eq!(mem::align_of::<EmscriptenKeyboardEvent>(), 8usize);
}
impl Clone for EmscriptenKeyboardEvent {
fn clone(&self) -> Self {
*self
}
}
#[repr(C)]
#[derive(Debug, Copy, Clone)]
pub struct EmscriptenMouseEvent {
pub timestamp: f64,
pub screenX: c_long,
pub screenY: c_long,
pub clientX: c_long,
pub clientY: c_long,
pub ctrlKey: c_int,
pub shiftKey: c_int,
pub altKey: c_int,
pub metaKey: c_int,
pub button: c_ushort,
pub buttons: c_ushort,
pub movementX: c_long,
pub movementY: c_long,
pub targetX: c_long,
pub targetY: c_long,
pub canvasX: c_long,
pub canvasY: c_long,
pub padding: c_long,
}
#[test]
fn bindgen_test_layout_EmscriptenMouseEvent() {
assert_eq!(mem::size_of::<EmscriptenMouseEvent>(), 120usize);
assert_eq!(mem::align_of::<EmscriptenMouseEvent>(), 8usize);
}
#[repr(C)]
#[derive(Debug, Copy, Clone)]
pub struct EmscriptenTouchPoint {
pub identifier: c_long,
pub screenX: c_long,
pub screenY: c_long,
pub clientX: c_long,
pub clientY: c_long,
pub pageX: c_long,
pub pageY: c_long,
pub isChanged: c_int,
pub onTarget: c_int,
pub targetX: c_long,
pub targetY: c_long,
pub canvasX: c_long,
pub canvasY: c_long,
}
#[test]
fn bindgen_test_layout_EmscriptenTouchPoint() {
assert_eq!(mem::size_of::<EmscriptenTouchPoint>(), 96usize);
assert_eq!(mem::align_of::<EmscriptenTouchPoint>(), 8usize);
}
#[repr(C)]
#[derive(Debug, Copy, Clone)]
pub struct EmscriptenTouchEvent {
pub numTouches: c_int,
pub ctrlKey: c_int,
pub shiftKey: c_int,
pub altKey: c_int,
pub metaKey: c_int,
pub touches: [EmscriptenTouchPoint; 32usize],
}
#[test]
fn bindgen_test_layout_EmscriptenTouchEvent() {
assert_eq!(mem::size_of::<EmscriptenTouchEvent>(), 3096usize);
assert_eq!(mem::align_of::<EmscriptenTouchEvent>(), 8usize);
}
#[repr(C)]
pub struct EmscriptenPointerlockChangeEvent {
pub isActive: c_int,
pub nodeName: [c_char; 128usize],
pub id: [c_char; 128usize],
}
#[test]
fn bindgen_test_layout_EmscriptenPointerlockChangeEvent() {
assert_eq!(mem::size_of::<EmscriptenPointerlockChangeEvent>(), 260usize);
assert_eq!(mem::align_of::<EmscriptenPointerlockChangeEvent>(), 4usize);
}
extern "C" {
pub fn emscripten_set_canvas_size(width: c_int, height: c_int) -> EMSCRIPTEN_RESULT;
pub fn emscripten_get_canvas_size(
width: *mut c_int,
height: *mut c_int,
is_fullscreen: *mut c_int,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_set_element_css_size(
target: *const c_char,
width: c_double,
height: c_double,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_get_element_css_size(
target: *const c_char,
width: *mut c_double,
height: *mut c_double,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_request_pointerlock(
target: *const c_char,
deferUntilInEventHandler: EM_BOOL,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_exit_pointerlock() -> EMSCRIPTEN_RESULT;
pub fn emscripten_request_fullscreen(
target: *const c_char,
deferUntilInEventHandler: EM_BOOL,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_exit_fullscreen() -> EMSCRIPTEN_RESULT;
pub fn emscripten_set_keydown_callback(
target: *const c_char,
userData: *mut c_void,
useCapture: EM_BOOL,
callback: em_key_callback_func,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_set_keyup_callback(
target: *const c_char,
userData: *mut c_void,
useCapture: EM_BOOL,
callback: em_key_callback_func,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_set_mousemove_callback(
target: *const c_char,
user_data: *mut c_void,
use_capture: EM_BOOL,
callback: em_mouse_callback_func,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_set_mousedown_callback(
target: *const c_char,
user_data: *mut c_void,
use_capture: EM_BOOL,
callback: em_mouse_callback_func,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_set_mouseup_callback(
target: *const c_char,
user_data: *mut c_void,
use_capture: EM_BOOL,
callback: em_mouse_callback_func,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_hide_mouse();
pub fn emscripten_get_device_pixel_ratio() -> f64;
pub fn emscripten_set_pointerlockchange_callback(
target: *const c_char,
userData: *mut c_void,
useCapture: EM_BOOL,
callback: em_pointerlockchange_callback_func,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_set_fullscreenchange_callback(
target: *const c_char,
userData: *mut c_void,
useCapture: EM_BOOL,
callback: em_fullscreenchange_callback_func,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_asm_const(code: *const c_char);
pub fn emscripten_set_main_loop(
func: em_callback_func,
fps: c_int,
simulate_infinite_loop: EM_BOOL,
);
pub fn emscripten_cancel_main_loop();
pub fn emscripten_set_touchstart_callback(
target: *const c_char,
userData: *mut c_void,
useCapture: c_int,
callback: em_touch_callback_func,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_set_touchend_callback(
target: *const c_char,
userData: *mut c_void,
useCapture: c_int,
callback: em_touch_callback_func,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_set_touchmove_callback(
target: *const c_char,
userData: *mut c_void,
useCapture: c_int,
callback: em_touch_callback_func,
) -> EMSCRIPTEN_RESULT;
pub fn emscripten_set_touchcancel_callback(
target: *const c_char,
userData: *mut c_void,
useCapture: c_int,
callback: em_touch_callback_func,
) -> EMSCRIPTEN_RESULT;
}

1246
src/platform_impl/emscripten/mod.rs
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File diff suppressed because it is too large Load diff

4
src/platform_impl/mod.rs
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@ -21,9 +21,6 @@ mod platform;
#[cfg(target_os = "ios")]
#[path = "ios/mod.rs"]
mod platform;
#[cfg(target_os = "emscripten")]
#[path = "emscripten/mod.rs"]
mod platform;
#[cfg(all(
not(target_os = "ios"),
@ -35,6 +32,5 @@ mod platform;
not(target_os = "freebsd"),
not(target_os = "netbsd"),
not(target_os = "openbsd"),
not(target_os = "emscripten")
))]
compile_error!("The platform you're compiling for is not supported by winit");