From 5f1efa0de39ce43750a77776855128aef4fb113b Mon Sep 17 00:00:00 2001
From: kappa1 <one.kappa@googlemail.com>
Date: Sun, 13 May 2012 12:11:12 +0000
Subject: [PATCH] Fix Mouse.getDX() and Mouse.getDY() values when mouse moves
 outside Display window & clipping is on. Thanks to ra4king for patch.

---
 src/java/org/lwjgl/input/Mouse.java | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/src/java/org/lwjgl/input/Mouse.java b/src/java/org/lwjgl/input/Mouse.java
index 35fa2d06..1504cf8b 100644
--- a/src/java/org/lwjgl/input/Mouse.java
+++ b/src/java/org/lwjgl/input/Mouse.java
@@ -77,6 +77,12 @@ public class Mouse {
 
 	/** Mouse absolute Y position in pixels */
 	private static int				y;
+	
+	/** Mouse absolute X position in pixels without any clipping */
+	private static int				absolute_x;
+	
+	/** Mouse absolute Y position in pixels without any clipping */
+	private static int				absolute_y;
 
 	/** Buffer to hold the deltas dx, dy and dwheel */
 	private static IntBuffer	coord_buffer;
@@ -355,17 +361,21 @@ public class Mouse {
 				dy += poll_coord2;
 				x += poll_coord1;
 				y += poll_coord2;
+				absolute_x += poll_coord1;
+				absolute_y += poll_coord2;
 			} else {
-				dx = poll_coord1 - x;
-				dy = poll_coord2 - y;
-				x = poll_coord1;
-				y = poll_coord2;
+				dx = poll_coord1 - absolute_x;
+				dy = poll_coord2 - absolute_y;
+				absolute_x = x = poll_coord1;
+				absolute_y = y = poll_coord2;
 			}
-                        if(clipMouseCoordinatesToWindow) {
-                            x = Math.min(Display.getWidth() - 1, Math.max(0, x));
-                            y = Math.min(Display.getHeight() - 1, Math.max(0, y));
-                        }
-                        dwheel += poll_dwheel;
+                        
+			if(clipMouseCoordinatesToWindow) {
+				x = Math.min(Display.getWidth() - 1, Math.max(0, x));
+				y = Math.min(Display.getHeight() - 1, Math.max(0, y));
+			}
+			
+			dwheel += poll_dwheel;
 			read();
 		}
 	}