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Fix mobile fake mouse input
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@ethanaobrien
ethanaobrien committed Jul 31, 2024
1 parent a725c1b commit fef7b74
Showing 1 changed file with 62 additions and 56 deletions.
118 changes: 62 additions & 56 deletions input/drivers/emulatorjs_input.c
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Original file line number Diff line number Diff line change
Expand Up @@ -65,13 +65,11 @@ typedef struct rwebinput_keyboard_event_queue

typedef struct rwebinput_touch
{
long touch_id;
long last_canvasX;
long last_canvasY;
bool down;
long last_touchdown_id;
long last_touchdown_location;
bool clicked_yet;
bool clicked_twice;
} rwebinput_touch_t;

typedef struct rwebinput_mouse_states
Expand Down Expand Up @@ -321,79 +319,87 @@ static EM_BOOL rwebinput_wheel_cb(int event_type,
return EM_TRUE;
}

static bool calculate_diff(long last_touchdown_location, EmscriptenTouchPoint touch) {
long press_diff = 25;
long diff = last_touchdown_location - (touch.targetX + touch.targetY);
//printf("Touch of diff: %li\n", diff);
return abs(diff) < press_diff;
}

static EM_BOOL rwebinput_touch_cb(int event_type,
const EmscriptenTouchEvent *touch_event, void *user_data)
{
rwebinput_input_t *rwebinput = (rwebinput_input_t*)user_data;
rwebinput_touch_t *touch_handler = &rwebinput->touch;

EmscriptenTouchPoint changed_touch;
EmscriptenTouchPoint touch;
bool touch_changed = false;
for (int i=0; i<touch_event->numTouches; i++) {
if (touch_event->touches[i].isChanged) {
changed_touch = touch_event->touches[i];
touch = touch_event->touches[i];
touch_changed = true;
}
}
if (!touch_changed) return EM_TRUE;
if (event_type == EMSCRIPTEN_EVENT_TOUCHSTART && touch_handler->last_touchdown_id != changed_touch.identifier) {
touch_handler->clicked_yet = false;
touch_handler->last_touchdown_id = changed_touch.identifier;
touch_handler->last_touchdown_location = (changed_touch.canvasX + changed_touch.canvasY);
}
if (event_type == EMSCRIPTEN_EVENT_TOUCHSTART && touch_handler->clicked_yet) {
rwebinput->mouse.buttons |= 1 << 0;
}
if (event_type == EMSCRIPTEN_EVENT_TOUCHMOVE && touch_handler->last_touchdown_id == changed_touch.identifier) {
long u = touch_handler->last_touchdown_location - (changed_touch.canvasX + changed_touch.canvasY);
//25 may be too much of an offset...
if (((u<0)?-u:u) > 25) {
touch_handler->last_touchdown_id = -1;
}
}

if (event_type == EMSCRIPTEN_EVENT_TOUCHCANCEL || event_type == EMSCRIPTEN_EVENT_TOUCHEND) {
if (changed_touch.identifier == touch_handler->touch_id) {
touch_handler->down = false;
}
if (touch_handler->last_touchdown_id == changed_touch.identifier && !touch_handler->clicked_yet) {
//printf("Touch changed. %li %i %i\n", touch.identifier, touch.targetX, touch.targetY);

switch (event_type) {
case EMSCRIPTEN_EVENT_TOUCHSTART: {
touch_handler->last_canvasX = touch.targetX;
touch_handler->last_canvasY = touch.targetY;
if (touch_handler->clicked_yet) {
if (touch_handler->clicked_twice) {
//printf("Click end!.\n");
rwebinput->mouse.buttons &= ~(1 << 0);
touch_handler->clicked_yet = true;
touch_handler->clicked_twice = false;
break;
}
long is_pressed = calculate_diff(touch_handler->last_touchdown_location, touch);
if (is_pressed && !touch_handler->clicked_twice) {
//printf("Click start!.\n");
touch_handler->clicked_twice = true;
rwebinput->mouse.buttons |= 1 << 0;
break;
}
}
//printf("Touch start.\n");
touch_handler->clicked_yet = true;
} else if (touch_handler->clicked_yet) {
rwebinput->mouse.buttons &= ~(1 << 0);
touch_handler->clicked_yet = false;
touch_handler->last_touchdown_id = -1;
touch_handler->clicked_twice = false;
touch_handler->last_touchdown_location = (touch.targetX + touch.targetY);
break;
}
return EM_TRUE;
} else if (touch_handler->down && changed_touch.identifier != touch_handler->touch_id) {
return EM_TRUE; //I am not supporting multi touch
}
if (event_type == EMSCRIPTEN_EVENT_TOUCHSTART) {
touch_handler->down = true;
touch_handler->touch_id = changed_touch.identifier;
touch_handler->last_canvasX = changed_touch.canvasX;
touch_handler->last_canvasY = changed_touch.canvasY;
} else if (event_type == EMSCRIPTEN_EVENT_TOUCHMOVE) {
long diffX = changed_touch.canvasX - touch_handler->last_canvasX;
long diffY = changed_touch.canvasY - touch_handler->last_canvasY;
touch_handler->last_canvasX = changed_touch.canvasX;
touch_handler->last_canvasY = changed_touch.canvasY;
case EMSCRIPTEN_EVENT_TOUCHMOVE: {
long diffX = (touch.targetX - touch_handler->last_canvasX) / 2;
long diffY = (touch.targetY - touch_handler->last_canvasY) / 2;
touch_handler->last_canvasX = touch.targetX;
touch_handler->last_canvasY = touch.targetY;
//printf("Touch move. %li %li\n", diffX, diffY);

#ifdef WEB_SCALING
double dpr = emscripten_get_device_pixel_ratio();
rwebinput->mouse.x = (long)(changed_touch.canvasX * dpr);
rwebinput->mouse.y = (long)(changed_touch.canvasY * dpr);
rwebinput->mouse.pending_delta_x += (long)(diffX * dpr);
rwebinput->mouse.pending_delta_y += (long)(diffY * dpr);
double dpr = emscripten_get_device_pixel_ratio();
rwebinput->mouse.x = (long)(touch.targetX * dpr);
rwebinput->mouse.y = (long)(touch.targetY * dpr);
rwebinput->mouse.pending_delta_x += (long)(diffX * dpr);
rwebinput->mouse.pending_delta_y += (long)(diffY * dpr);
#else
rwebinput->mouse.x = changed_touch.canvasX;
rwebinput->mouse.y = changed_touch.canvasY;
rwebinput->mouse.pending_delta_x += diffX;
rwebinput->mouse.pending_delta_y += diffY;
rwebinput->mouse.x = touch.targetX;
rwebinput->mouse.y = touch.targetY;
rwebinput->mouse.pending_delta_x += diffX;
rwebinput->mouse.pending_delta_y += diffY;
#endif

//printf("diff: %li\n", diffX);
break;
}
case EMSCRIPTEN_EVENT_TOUCHCANCEL:
case EMSCRIPTEN_EVENT_TOUCHEND: {
long is_pressed = calculate_diff(touch_handler->last_touchdown_location, touch);
if (!is_pressed) {
touch_handler->clicked_yet = false;
touch_handler->clicked_twice = false;
}
break;
}
}

return EM_TRUE;
}

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