Fix race condition where update_gfx could be called after renderer shutdown (#98)

Author: Mr-Wiseguy

librecomp/src/recomp.cpp

@@ -502,6 +502,7 @@ bool ultramodern::is_game_started() {
 }
 
 std::atomic_bool exited = false;
+moodycamel::LightweightSemaphore graphics_shutdown_ready;
 
 void ultramodern::quit() {
     exited.store(true);
@@ -763,6 +764,8 @@ void recomp::start(
         }
     }
 
+    graphics_shutdown_ready.signal();
+
     game_thread.join();
     ultramodern::join_event_threads();
     ultramodern::join_thread_cleaner_thread();

ultramodern/src/events.cpp

@@ -105,6 +105,7 @@ uint64_t total_vis = 0;
 
 
 extern std::atomic_bool exited;
+extern moodycamel::LightweightSemaphore graphics_shutdown_ready;
 
 void set_dummy_vi();
 
@@ -318,6 +319,7 @@ void gfx_thread_func(uint8_t* rdram, moodycamel::LightweightSemaphore* thread_re
         }
     }
 
+    graphics_shutdown_ready.wait();
     renderer_context->shutdown();
 }