From 515b7e93b5af3dc552a7974ed7245a0e0456ae2a Mon Sep 17 00:00:00 2001
From: Rokas Kupstys <rokups@zoho.com>
Date: Fri, 27 Aug 2021 17:02:07 +0300
Subject: [PATCH] Fix horizontal wheel scroll direction of X11.

---
 src/video/x11/SDL_x11events.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/video/x11/SDL_x11events.c b/src/video/x11/SDL_x11events.c
index f91131305..e14f8d858 100644
--- a/src/video/x11/SDL_x11events.c
+++ b/src/video/x11/SDL_x11events.c
@@ -1228,7 +1228,7 @@ X11_DispatchEvent(_THIS, XEvent *xevent)
             printf("window %p: ButtonPress (X11 button = %d)\n", data, xevent->xbutton.button);
 #endif
             if (X11_IsWheelEvent(display,xevent,&xticks, &yticks)) {
-                SDL_SendMouseWheel(data->window, 0, (float) xticks, (float) yticks, SDL_MOUSEWHEEL_NORMAL);
+                SDL_SendMouseWheel(data->window, 0, (float) -xticks, (float) yticks, SDL_MOUSEWHEEL_NORMAL);
             } else {
                 SDL_bool ignore_click = SDL_FALSE;
                 int button = xevent->xbutton.button;