# HG changeset patch
# User Sam Lantinga <slouken@libsdl.org>
# Date 1253517651 0
# Node ID a673f44949d6446bffaeaa1bf8a9521cce9af875
# Parent  892623cfee40cf7a5d20045868a9062098346c55
Fixed bug #562

this patch by Diego Pettenò <flameeyes@gentoo.org> for SDL-1.2:

The attached patch applies over latest ~arch SDL version, and allows to use the
xinerama support to launch an application full screened on the head "0".

The SDL_VIDEO_FULLSCREEN_HEAD environment variable sets the head on which the
full screen will be displayed, but if you set it to 0, the code simply ignores
it as unset. My patch changes the unset value to -1, so that the 0 value can be
used correctly. Without this, trying to get fullscreen on head 0 would get the
same result than not having xinerama enabled at all.

http://sources.gentoo.org/media-libs/libsdl/files/libsdl-1.2.11-xinerama-head-0.patch

SDL-1.3 doesnt seem to have any code like this, but it's still good for SDL-1.2

diff -r 892623cfee40 -r a673f44949d6 src/video/x11/SDL_x11modes.c
--- a/src/video/x11/SDL_x11modes.c	Mon Sep 21 07:03:29 2009 +0000
+++ b/src/video/x11/SDL_x11modes.c	Mon Sep 21 07:20:51 2009 +0000
@@ -526,7 +526,7 @@
     /* Query Xinerama extention */
     if ( CheckXinerama(this, &xinerama_major, &xinerama_minor) ) {
         /* Find out which screen is the desired one */
-        int desired = 0;
+        int desired = -1;
         int screens;
         int w, h;
         SDL_NAME(XineramaScreenInfo) *xinerama;
@@ -647,7 +647,7 @@
     /* XVidMode */
     if ( !use_xrandr &&
 #if SDL_VIDEO_DRIVER_X11_XINERAMA
-         (!use_xinerama || xinerama_info.screen_number == 0) &&
+         (!use_xinerama || xinerama_info.screen_number == -1) &&
 #endif
          CheckVidMode(this, &vm_major, &vm_minor) &&
          SDL_NAME(XF86VidModeGetAllModeLines)(SDL_Display, SDL_Screen,&nmodes,&modes) )