Reverted the relative coordinate 'bug' - that's the required behaviour when Window.update is calling Mouse.poll. Consider the case where we call Window.update twice before checking getD*: with the old behaviour, only the deltas between the updates are reported, not those before the first update

src/java/org/lwjgl/input/Mouse.java

@@ -348,9 +348,9 @@ public class Mouse {
 		// set absolute position
 		x += poll_dx;
 		y += poll_dy;
-		dx = poll_dx;
-		dy = poll_dy;
-		dwheel = poll_dwheel;
+		dx += poll_dx;
+		dy += poll_dy;
+		dwheel += poll_dwheel;
 
 		// if window has been created, clamp to edges
 		if (Window.isCreated()) {
@@ -502,21 +502,27 @@ public class Mouse {
 	 * @return Movement on the x axis since last time getDX() was called
 	 */
 	public static int getDX() {
-		return dx;
+		int result = dx;
+		dx = 0;
+		return result;
 	}
 
 	/**
 	 * @return Movement on the y axis since last time getDY() was called
 	 */
 	public static int getDY() {
-		return dy;
+		int result = dy;
+		dy = 0;
+		return result;
 	}
 
 	/**
 	 * @return Movement of the wheel since last time getDWheel() was called
 	 */
 	public static int getDWheel() {
-		return dwheel;
+		int result = dwheel;
+		dwheel = 0;
+		return result;
 	}
 
 	/**
@@ -564,4 +570,4 @@ public class Mouse {
 			}
 		}
 	}
-}
+}