shader auto reload

src/app.cpp

@@ -505,6 +505,7 @@ void App::update(float dt)
 {
     static std::mutex mutex;
     static float rec_timer = 0.f;
+    static float reload_timer = 0.f;
 
     // avoid multiple threads to update the scene
     std::lock_guard<std::mutex> lock(mutex);
@@ -524,17 +525,18 @@ void App::update(float dt)
     //glClear(GL_COLOR_BUFFER_BIT);
 
     //if (!canvas->m_mouse_captured)
+#if _DEBUG && (_WIN32 || __OSX__)
+    reload_timer += dt;
+    if (reload_timer > 1.0)
     {
-#if _WIN32 || __OSX__
+        reload_timer = 0;
+        ShaderManager::reload();
         layout.reload();
-#endif
         if (auto* main = layout[main_id])
-        {
             main->update(width, height, zoom);
-            //stroke->update_controls();
-        }
     }
-    
+#endif
+
     {
         static glm::vec4 color_button_normal{ .1, .1, .1, 1 };
         static glm::vec4 color_button_hlight{ 1, .0, .0, 1 };