fix vr shutdown

src/main.cpp

@@ -35,6 +35,7 @@ std::map<kKey, int> vkey_map;
 std::thread hmd_renderer;
 std::thread renderer;
 int running = -1;
+int vr_running = 0;
 std::mutex render_mutex;
 std::condition_variable render_cv;
 
@@ -475,10 +476,11 @@ bool win32_vr_start()
         BT_SetTerminate();
         LOG("start hmd render thread");
         App::I.has_vr = true;
+        vr_running = true;
 
         const float target_tick_rate = 90;
         unsigned long t0 = GetTickCount();
-        while (running == 1 && vive->Valid())
+        while (vr_running && running == 1 && vive->Valid())
         {
             std::unique_lock<std::mutex> lock(hmd_render_mutex);
             unsigned long t1 = GetTickCount();
@@ -487,7 +489,7 @@ bool win32_vr_start()
             vive->Update();
             App::I.vr_active = vive->m_active;
 
-            if (vive->m_active)
+            if (vr_running && vive->m_active)
             {
                 async_lock();
                 vive->Draw();
@@ -500,9 +502,12 @@ bool win32_vr_start()
         }
         App::I.vr_active = false;
         App::I.has_vr = false;
-        async_lock();
-        vive->Terminate();
-        async_unlock();
+        vr_running = false;
+        if (async_lock_try())
+        {
+            vive->Terminate();
+            async_unlock();
+        }
         LOG("hmd renderer terminated");
     });
     return true;
@@ -512,6 +517,9 @@ void win32_vr_stop()
 {
     if (vive)
     {
+        vr_running = false;
+        if (hmd_renderer.joinable())
+            hmd_renderer.join();
         vive->Terminate();
         delete vive;
         vive = nullptr;