From 5aaa4e399ab3df2cd52932d29658b487a167991c Mon Sep 17 00:00:00 2001
From: fgsfds <pvt.fgsfds@gmail.com>
Date: Fri, 10 Jul 2020 15:44:58 +0300
Subject: [PATCH] don't assume first frame happens at 0 ticks

---
 src/pc/gfx/gfx_sdl2.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/pc/gfx/gfx_sdl2.c b/src/pc/gfx/gfx_sdl2.c
index 25c9f069..4d907893 100644
--- a/src/pc/gfx/gfx_sdl2.c
+++ b/src/pc/gfx/gfx_sdl2.c
@@ -328,6 +328,8 @@ static bool gfx_sdl_start_frame(void) {
 
 static inline void sync_framerate_with_timer(void) {
     static Uint32 last_time = 0;
+    // get base timestamp on the first frame (might be different from 0)
+    if (last_time == 0) last_time = SDL_GetTicks();
     const int elapsed = SDL_GetTicks() - last_time;
     if (elapsed < frame_time)
         SDL_Delay(frame_time - elapsed);