From 12b93337d1cc12f4523009d0a687eaf907089de1 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Sat, 1 Jun 2024 22:43:52 -0500
Subject: [PATCH] Fix SDL_VIDEODRIVER override when the Qt platform plugin was
 manually set

---
 app/main.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/app/main.cpp b/app/main.cpp
index 50c0e813..e9edb16e 100644
--- a/app/main.cpp
+++ b/app/main.cpp
@@ -388,7 +388,6 @@ int main(int argc, char *argv[])
         if (!qEnvironmentVariableIsSet("QT_QPA_PLATFORM")) {
             qInfo() << "Unable to detect Wayland or X11, so EGLFS will be used by default. Set QT_QPA_PLATFORM to override this.";
             qputenv("QT_QPA_PLATFORM", "eglfs");
-            qputenv("SDL_VIDEODRIVER", "kmsdrm");
 
             if (!qEnvironmentVariableIsSet("QT_QPA_EGLFS_ALWAYS_SET_MODE")) {
                 qInfo() << "Setting display mode by default. Set QT_QPA_EGLFS_ALWAYS_SET_MODE=0 to override this.";
@@ -546,6 +545,14 @@ int main(int argc, char *argv[])
 
     QGuiApplication app(argc, argv);
 
+#ifndef STEAM_LINK
+    // Force use of the KMSDRM backend for SDL when using Qt platform plugins
+    // that directly draw to the display without a windowing system.
+    if (QGuiApplication::platformName() == "eglfs" || QGuiApplication::platformName() == "linuxfb") {
+        qputenv("SDL_VIDEODRIVER", "kmsdrm");
+    }
+#endif
+
     GlobalCommandLineParser parser;
     GlobalCommandLineParser::ParseResult commandLineParserResult = parser.parse(app.arguments());
     switch (commandLineParserResult) {