Commits on Feb 19, 2021

1. Improve macOS mouse latency and stale positioning …

   This commit makes several changes to input event handling in macOS:
   
   _sapp_macos_update_mouse() has been changed to take an NSEvent*
   argument, instead of no arguments. And instead of using [window
   mouseLocationOutsideOfEventStream] to get the position of the mouse, it
   uses event.locationInWindow. This seems to sometimes eliminate a frame
   of mouse latency.
   
   _sapp_macos_update_mouse() is no longer called immediately before
   rendering a frame. Instead, it's called at the beginning of each of the
   mouseMoved:, mouseDragged:, mouseDown:, etc. methods with its associated
   NSEvent*. Immediately after, _sapp_macos_mouse_event() is called. This
   eliminates a full frame of mouse latency. This also fixes situations
   where the mouse cursor's resting apparent position would lag behind its
   resting true position after the user stops moving the mouse.
   
   _sapp_macos_poll_input_events() has been added, which calls [NSApp
   nextEventMatchingMask: ...] to manually read and dispatch input events
   from the event queue. _sapp_macos_poll_input_events() is called
   immediately before _sapp_macos_frame(). This will sometimes catch and
   dispatch input events that occurred shortly before the frame is to be
   rendered, but hadn't yet been dispatched by other mechanisms. This
   occasionally eliminates a frame of latency, and improves the worst-case
   bounds. This seems to happen to 5% or fewer mouse events.
   
   [NSEvent setMouseCoalescingEnabled:NO], if it even still does anything,
   is now called once at during application startup instead of toggled off
   and on along with mouse lock.

   

   cancel committed Feb 19, 2021
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