commit 64ad608320435aaf69026a5745fbcdea9177700f
Author:     Jonathan Dowland <jon+github@alcopop.org>
AuthorDate: Tue Feb 21 17:16:44 2017 +0000
Commit:     Jonathan Dowland <jon+github@alcopop.org>
CommitDate: Tue Feb 21 17:16:44 2017 +0000

    Don't enable vsync for -timedemo mode
---
 src/i_video.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/i_video.c b/src/i_video.c
index 4ca10643..db524fad 100644
--- a/src/i_video.c
+++ b/src/i_video.c
@@ -28,6 +28,7 @@
 #include "icon.c"

 #include "config.h"
+#include "d_loop.h"
 #include "deh_str.h"
 #include "doomtype.h"
 #include "i_input.h"
@@ -1200,8 +1201,11 @@ static void SetVideoMode(void)
     // intermediate texture into the upscaled texture.
     renderer_flags = SDL_RENDERER_TARGETTEXTURE;

-    // Turn on vsync
-    renderer_flags |= SDL_RENDERER_PRESENTVSYNC;
+    // Turn on vsync if we aren't in a -timedemo
+    if (!singletics)
+    {
+        renderer_flags |= SDL_RENDERER_PRESENTVSYNC;
+    }

     if (force_software_renderer)
     {