Mac: Make mouse movement smooth at edge of window when grabbed.

There's a limit of one update every 250ms when warping the mouse, and we can work around that by disassociating the cursor & the mouse before issuing our warp, then re-associating them.
libsdl-org · Apr 24, 2013 · 9ac1c60 · 9ac1c60
1 parent 8e89a32
commit 9ac1c60
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/src/video/cocoa/SDL_cocoawindow.m b/src/video/cocoa/SDL_cocoawindow.m
@@ -392,7 +392,14 @@ - (void)mouseMoved:(NSEvent *)theEvent
 
             cgpoint.x = window->x + x;
             cgpoint.y = window->y + y;
+
+            /* We have to disassociate the curosr & the mouse before issuing
+             * this cursor warp, otherwise it gets limited to one update per
+             * 250ms, and looks very choppy.
+             */
+            CGAssociateMouseAndMouseCursorPosition(NO);
             CGDisplayMoveCursorToPoint(kCGDirectMainDisplay, cgpoint);
+            CGAssociateMouseAndMouseCursorPosition(YES);
         }
     }
     SDL_SendMouseMotion(window, 0, 0, x, y);