From 8f04ad05ae78626fb207854fac63722a985ecb8a Mon Sep 17 00:00:00 2001
From: Nadia Holmquist Pedersen <nadia@nhp.sh>
Date: Mon, 20 May 2024 15:05:30 +0200
Subject: [PATCH] Warn if user overrode the SDL video driver hint

---
 src/main/main.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main/main.cpp b/src/main/main.cpp
index a52e78c..42b382f 100644
--- a/src/main/main.cpp
+++ b/src/main/main.cpp
@@ -138,6 +138,10 @@ ultramodern::WindowHandle create_window(ultramodern::gfx_callbacks_t::gfx_data_t
 #elif defined(__ANDROID__)
     static_assert(false && "Unimplemented");
 #elif defined(__linux__)
+    if (wmInfo.subsystem != SDL_SYSWM_X11) {
+        exit_error("Unsupported SDL2 video driver \"%s\". Only X11 is supported on Linux.\n", SDL_GetCurrentVideoDriver());
+    }
+
     return ultramodern::WindowHandle{ wmInfo.info.x11.display, wmInfo.info.x11.window };
 #else
     static_assert(false && "Unimplemented");