Change default SDL driver name from opengl to empty (autoselection)

config/schemas/settings.json

@@ -199,6 +199,7 @@
 				},
 				"driver" : {
 					"type" : "string",
+					"defaultWindows" : "",
 					"default" : "opengl",
 					"description" : "preferred graphics backend driver name for SDL2"
 				},

launcher/settingsView/csettingsview_moc.cpp

@@ -169,6 +169,8 @@ static QStringList getAvailableRenderingDrivers()
 	SDL_Init(SDL_INIT_VIDEO);
 	QStringList result;
 
+	result += QString(); // empty value for autoselection
+
 	int driversCount = SDL_GetNumRenderDrivers();
 
 	for(int it = 0; it < driversCount; it++)

lib/JsonNode.cpp

@@ -1289,7 +1289,12 @@ static JsonNode getDefaultValue(const JsonNode & schema, std::string fieldName)
 #elif defined(VCMI_ANDROID)
 	if (!fieldProps["defaultAndroid"].isNull())
 		return fieldProps["defaultAndroid"];
-#elif !defined(VCMI_MOBILE)
+#elif defined(VCMI_WINDOWS)
+	if (!fieldProps["defaultWindows"].isNull())
+		return fieldProps["defaultWindows"];
+#endif
+
+#if !defined(VCMI_MOBILE)
 	if (!fieldProps["defaultDesktop"].isNull())
 		return fieldProps["defaultDesktop"];
 #endif