From faa183a060249be6d941c91ad1527c14395ff41d Mon Sep 17 00:00:00 2001
From: rubidium <rubidium@openttd.org>
Date: Fri, 14 Sep 2007 21:35:22 +0000
Subject: [PATCH] (svn r11103) -Codechange: remove pointless comparison as it
 can never ever be true (unless you've got at least 3 bit errors and then
 you're screwed anyway). Patch by frosch.

---
 src/viewport.cpp | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/viewport.cpp b/src/viewport.cpp
index 26af2dfb63..5880c445fa 100644
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -1161,13 +1161,13 @@ static void ViewportSortParentSprites(ParentSpriteToDraw *psd[])
 						continue;
 					}
 				} else {
+					/* We only change the order, if it is definite.
+					 * I.e. every single order of X, Y, Z says ps2 is behind ps or they overlap.
+					 * That is: If one partial order says ps behind ps2, do not change the order.
+					 */
 					if (ps->xmax < ps2->xmin ||
 							ps->ymax < ps2->ymin ||
-							ps->zmax < ps2->zmin || (
-								ps->xmin < ps2->xmax &&
-								ps->ymin < ps2->ymax &&
-								ps->zmin < ps2->zmax
-							)) {
+							ps->zmax < ps2->zmin) {
 						continue;
 					}
 				}