refine multi viewport support (#604)

src/window/gui/Gui.cpp

@@ -233,6 +233,16 @@ void Gui::LoadTextureFromRawImage(const std::string& name, const std::string& pa
 }
 
 bool Gui::SupportsViewports() {
+#ifdef __linux__
+    if (std::string(std::getenv("XDG_CURRENT_DESKTOP")) == "gamescope") {
+        return false;
+    }
+#endif
+
+#if defined(__ANDROID__) || defined(__IOS__)
+    return false;
+#endif
+
     switch (Context::GetInstance()->GetWindow()->GetWindowBackend()) {
         case WindowBackend::DX11:
             return true;