From e964d00f645e8bca9b6fd25219414fd6deb81701 Mon Sep 17 00:00:00 2001
From: Philipp Wiesemann <philipp.wiesemann@arcor.de>
Date: Wed, 11 May 2016 21:11:12 +0200
Subject: [PATCH] X11: Fixed SDL_GL_GetSwapInterval() returning -1 if interval
 is unknown.

It should return 0 as a safe default if the interval can not be determined.
---
 src/video/x11/SDL_x11opengl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/video/x11/SDL_x11opengl.c b/src/video/x11/SDL_x11opengl.c
index 8b634be3d..c5e88ff6d 100644
--- a/src/video/x11/SDL_x11opengl.c
+++ b/src/video/x11/SDL_x11opengl.c
@@ -710,7 +710,7 @@ X11_GL_MakeCurrent(_THIS, SDL_Window * window, SDL_GLContext context)
    with 0 as an argument.
 */
 
-static int swapinterval = -1;
+static int swapinterval = 0;
 int
 X11_GL_SetSwapInterval(_THIS, int interval)
 {