From 1440142d407d973da2d544d352eb0d717865fb7c Mon Sep 17 00:00:00 2001
From: FunkyFr3sh <cc.red.alert.1@googlemail.com>
Date: Fri, 18 Aug 2023 18:01:53 +0200
Subject: [PATCH] check if chosen refresh rate is supported

---
 src/dd.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/dd.c b/src/dd.c
index 5d67a52..64e4c5d 100644
--- a/src/dd.c
+++ b/src/dd.c
@@ -631,18 +631,26 @@ HRESULT dd_SetDisplayMode(DWORD dwWidth, DWORD dwHeight, DWORD dwBPP, DWORD dwFl
     mouse_unlock();
 
     memset(&g_ddraw->render.mode, 0, sizeof(DEVMODE));
-
     g_ddraw->render.mode.dmSize = sizeof(DEVMODE);
-    g_ddraw->render.mode.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT;
-    g_ddraw->render.mode.dmPelsWidth = g_ddraw->render.width;
-    g_ddraw->render.mode.dmPelsHeight = g_ddraw->render.height;
 
     if (g_ddraw->refresh_rate)
     {
         g_ddraw->render.mode.dmFields |= DM_DISPLAYFREQUENCY;
         g_ddraw->render.mode.dmDisplayFrequency = g_ddraw->refresh_rate;
+
+        if (ChangeDisplaySettings(&g_ddraw->render.mode, CDS_TEST) != DISP_CHANGE_SUCCESSFUL)
+        {
+            g_ddraw->refresh_rate = 0;
+
+            g_ddraw->render.mode.dmFields = 0;
+            g_ddraw->render.mode.dmDisplayFrequency = 0;
+        }
     }
 
+    g_ddraw->render.mode.dmFields |= DM_PELSWIDTH | DM_PELSHEIGHT;
+    g_ddraw->render.mode.dmPelsWidth = g_ddraw->render.width;
+    g_ddraw->render.mode.dmPelsHeight = g_ddraw->render.height;
+
     if (!g_ddraw->windowed)
     {
         /* Making sure the chosen resolution is valid */