From 6195422c66d329222f8005efc687840deced6ee7 Mon Sep 17 00:00:00 2001
From: Dan Elkouby <streetwalkermc@gmail.com>
Date: Sat, 15 Dec 2018 11:22:38 +0200
Subject: [PATCH] Swap control only works with OpenGL

---
 src/compton.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/compton.c b/src/compton.c
index b3f9f54..5323ae6 100644
--- a/src/compton.c
+++ b/src/compton.c
@@ -4566,8 +4566,8 @@ static bool
 vsync_opengl_swc_init(session_t *ps) {
 #ifdef CONFIG_OPENGL
   if (!bkend_use_glx(ps)) {
-    printf_errf("(): I'm afraid OpenGL swap control wouldn't help if you are "
-        "not using GLX backend. You could try, nonetheless.");
+    printf_errf("(): OpenGL swap control requires the GLX backend.");
+    return false;
   }
 
   if (!vsync_opengl_swc_swap_interval(ps, 1)) {
@@ -4631,7 +4631,8 @@ vsync_opengl_swc_deinit(session_t *ps) {
 bool
 vsync_init(session_t *ps) {
   // Mesa turns on swap control by default, undo that
-  vsync_opengl_swc_swap_interval(ps, 0);
+  if (bkend_use_glx(ps))
+    vsync_opengl_swc_swap_interval(ps, 0);
 
   if (ps->o.vsync && VSYNC_FUNCS_INIT[ps->o.vsync]
       && !VSYNC_FUNCS_INIT[ps->o.vsync](ps)) {