From debea8cfeccc653029feb85933642ab01c9afeba Mon Sep 17 00:00:00 2001
From: William McBrine <wmcbrine@gmail.com>
Date: Sun, 10 Oct 2021 02:40:21 -0400
Subject: [PATCH] Wait until window is exposed before getting surface. (Initial
 screen draw could be incomplete without this.)

---
 sdl2/pdcscrn.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sdl2/pdcscrn.c b/sdl2/pdcscrn.c
index 903735c5..14bb0c29 100644
--- a/sdl2/pdcscrn.c
+++ b/sdl2/pdcscrn.c
@@ -159,6 +159,7 @@ int _get_displaynum(void)
 
 int PDC_scr_open(void)
 {
+    SDL_Event event;
     int displaynum = 0;
 
     PDC_LOG(("PDC_scr_open() - called\n"));
@@ -293,6 +294,13 @@ int PDC_scr_open(void)
 
     SDL_PumpEvents();
 
+    /* Wait until window is exposed before getting surface */
+
+    while (SDL_PollEvent(&event))
+        if (SDL_WINDOWEVENT == event.type &&
+            SDL_WINDOWEVENT_EXPOSED == event.window.event)
+            break;
+
     if (!pdc_screen)
     {
         pdc_screen = SDL_GetWindowSurface(pdc_window);