From 9ac1c60e5162293405baa5d3e19c7b8750e8e159 Mon Sep 17 00:00:00 2001
From: "J?rgen P. Tjern?" <jorgen@valvesoftware.com>
Date: Tue, 23 Apr 2013 18:47:38 -0700
Subject: [PATCH] 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.
---
 src/video/cocoa/SDL_cocoawindow.m | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/video/cocoa/SDL_cocoawindow.m b/src/video/cocoa/SDL_cocoawindow.m
index 5e9c599fe..56eaa5134 100644
--- 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);