From 6817e821af9d69363466025f17ee367cfaa4550e Mon Sep 17 00:00:00 2001
From: Matthias Melcher <github@matthiasm.com>
Date: Sun, 26 Nov 2023 12:37:59 +0100
Subject: STR 1373: adds vsync control to OpenGL contexts on macOS

Windows and X11 to follow, no idea about Wayland.
---
 src/Fl_Gl_Window_Driver.H | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src/Fl_Gl_Window_Driver.H')

diff --git a/src/Fl_Gl_Window_Driver.H b/src/Fl_Gl_Window_Driver.H
index 839c5bc93..79f696905 100644
--- a/src/Fl_Gl_Window_Driver.H
+++ b/src/Fl_Gl_Window_Driver.H
@@ -69,6 +69,8 @@ public:
   virtual void swap_buffers() {}
   virtual void resize(int /*is_a_resize*/, int /*w*/, int /*h*/) {}
   virtual char swap_type();
+  virtual void swap_interval(int) { }
+  virtual int swap_interval() { return -1; }
   virtual int flush_begin(char&) {return 0;}
   virtual void gl_hide_before(void *&) {} // the default implementation may be enough
   static Fl_Gl_Choice *find_begin(int m, const int *alistp);
-- 
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