mangohud: fix crash (#381984)

      libdbus = dbus.lib;

      inherit hwdata;

    })

    # Fix crash when starting hidden

    # Upstream PR: https://github.com/flightlessmango/MangoHud/pull/1570

    # FIXME: remove when merged

    ./fix-crash.patch

  ];

  postPatch = ''

From f0d7e4f4b2d362d90bb81d0b10ef5c505b9661ea Mon Sep 17 00:00:00 2001

From: K900 <me@0upti.me>

Date: Fri, 14 Feb 2025 11:41:09 +0300

Subject: [PATCH] mangoapp: don't crash if gpus is not initialized yet

This seems to happen on startup on Steam Deck style gamescope-session setups.

Just check for gpus = null before trying to access it.

---

 src/app/main.cpp | 10 ++++++----

 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/app/main.cpp b/src/app/main.cpp

index 0c7c13e07e..4d1d3b1277 100644

--- a/src/app/main.cpp

+++ b/src/app/main.cpp

@@ -369,8 +369,9 @@ int main(int, char**)

                 XSync(x11_display, 0);

                 mangoapp_paused = false;

                 // resume all GPU threads

-                for (auto gpu : gpus->available_gpus)

-                    gpu->resume();

+                if (gpus)

+                    for (auto gpu : gpus->available_gpus)

+                        gpu->resume();

             }

             {

                 std::unique_lock<std::mutex> lk(mangoapp_m);

@@ -409,8 +410,9 @@ int main(int, char**)

             XSync(x11_display, 0);

             mangoapp_paused = true;

             // pause all GPUs threads

-            for (auto gpu : gpus->available_gpus)

-                gpu->pause();

+            if (gpus)

+                for (auto gpu : gpus->available_gpus)

+                    gpu->pause();

             // If mangoapp is hidden, using mangoapp_cv.wait() causes a hang.

             // Because of this hang, we can't detect if the user presses R_SHIFT + F12,