sokol_app.h x11: SAPP_EVENTTYPE_MOUSE_ENTER/LEAVE set dx/dy to zero

sokol_app.h

@@ -10119,11 +10119,14 @@ _SOKOL_PRIVATE sapp_mousebutton _sapp_x11_translate_button(const XEvent* event)
     }
 }
 
-_SOKOL_PRIVATE void _sapp_x11_mouse_update(int x, int y) {
+_SOKOL_PRIVATE void _sapp_x11_mouse_update(int x, int y, bool clear_dxdy) {
     if (!_sapp.mouse.locked) {
         const float new_x = (float) x;
         const float new_y = (float) y;
-        if (_sapp.mouse.pos_valid) {
+        if (clear_dxdy) {
+            _sapp.mouse.dx = 0.0f;
+            _sapp.mouse.dy = 0.0f;
+        } else if (_sapp.mouse.pos_valid) {
             _sapp.mouse.dx = new_x - _sapp.mouse.x;
             _sapp.mouse.dy = new_y - _sapp.mouse.y;
         }
@@ -10512,7 +10515,7 @@ _SOKOL_PRIVATE void _sapp_x11_process_event(XEvent* event) {
             break;
         case ButtonPress:
             {
-                _sapp_x11_mouse_update(event->xbutton.x, event->xbutton.y);
+                _sapp_x11_mouse_update(event->xbutton.x, event->xbutton.y, false);
                 const sapp_mousebutton btn = _sapp_x11_translate_button(event);
                 uint32_t mods = _sapp_x11_mods(event->xbutton.state);
                 // X11 doesn't set modifier bit on button down, so emulate that
@@ -10534,7 +10537,7 @@ _SOKOL_PRIVATE void _sapp_x11_process_event(XEvent* event) {
             break;
         case ButtonRelease:
             {
-                _sapp_x11_mouse_update(event->xbutton.x, event->xbutton.y);
+                _sapp_x11_mouse_update(event->xbutton.x, event->xbutton.y, false);
                 const sapp_mousebutton btn = _sapp_x11_translate_button(event);
                 if (btn != SAPP_MOUSEBUTTON_INVALID) {
                     uint32_t mods = _sapp_x11_mods(event->xbutton.state);
@@ -10548,19 +10551,19 @@ _SOKOL_PRIVATE void _sapp_x11_process_event(XEvent* event) {
         case EnterNotify:
             /* don't send enter/leave events while mouse button held down */
             if (0 == _sapp.x11.mouse_buttons) {
-                _sapp_x11_mouse_update(event->xcrossing.x, event->xcrossing.y);
+                _sapp_x11_mouse_update(event->xcrossing.x, event->xcrossing.y, true);
                 _sapp_x11_mouse_event(SAPP_EVENTTYPE_MOUSE_ENTER, SAPP_MOUSEBUTTON_INVALID, _sapp_x11_mods(event->xcrossing.state));
             }
             break;
         case LeaveNotify:
             if (0 == _sapp.x11.mouse_buttons) {
-                _sapp_x11_mouse_update(event->xcrossing.x, event->xcrossing.y);
+                _sapp_x11_mouse_update(event->xcrossing.x, event->xcrossing.y, true);
                 _sapp_x11_mouse_event(SAPP_EVENTTYPE_MOUSE_LEAVE, SAPP_MOUSEBUTTON_INVALID, _sapp_x11_mods(event->xcrossing.state));
             }
             break;
         case MotionNotify:
             if (!_sapp.mouse.locked) {
-                _sapp_x11_mouse_update(event->xmotion.x, event->xmotion.y);
+                _sapp_x11_mouse_update(event->xmotion.x, event->xmotion.y, false);
                 _sapp_x11_mouse_event(SAPP_EVENTTYPE_MOUSE_MOVE, SAPP_MOUSEBUTTON_INVALID, _sapp_x11_mods(event->xmotion.state));
             }
             break;