Stop threads of texture loading before destroying shader manager

src/graphics/sp/sp_base.cpp

@@ -574,6 +574,7 @@ void init()
 void destroy()
 {
     g_dy_dc.clear();
+    SPTextureManager::get()->stopThreads();
     SPShaderManager::destroy();
     g_glow_shader = NULL;
     g_normal_visualizer = NULL;

src/graphics/sp/sp_texture_manager.cpp

@@ -78,16 +78,7 @@ SPTextureManager::SPTextureManager()
 // ----------------------------------------------------------------------------
 SPTextureManager::~SPTextureManager()
 {
-    m_max_threaded_load_obj.store(0);
-    std::unique_lock<std::mutex> ul(m_thread_obj_mutex);
-    m_threaded_functions.push_back([](){ return true; });
-    m_thread_obj_cv.notify_all();
-    ul.unlock();
-    for (std::thread& t : m_threaded_load_obj)
-    {
-        t.join();
-    }
-    m_threaded_load_obj.clear();
+    assert(m_threaded_load_obj.empty());
     removeUnusedTextures();
 #ifdef DEBUG
     for (auto p : m_textures)

src/graphics/sp/sp_texture_manager.hpp

@@ -85,6 +85,20 @@ public:
     // ------------------------------------------------------------------------
     ~SPTextureManager();
     // ------------------------------------------------------------------------
+    void stopThreads()
+    {
+        m_max_threaded_load_obj.store(0);
+        std::unique_lock<std::mutex> ul(m_thread_obj_mutex);
+        m_threaded_functions.push_back([](){ return true; });
+        m_thread_obj_cv.notify_all();
+        ul.unlock();
+        for (std::thread& t : m_threaded_load_obj)
+        {
+            t.join();
+        }
+        m_threaded_load_obj.clear();
+    }
+    // ------------------------------------------------------------------------
     void removeUnusedTextures();
     // ------------------------------------------------------------------------
     void addThreadedFunction(std::function<bool()> threaded_function)