DMA based FillRect works

App/singleton.h

@@ -0,0 +1,35 @@
+/*
+ * singleton.h
+ *
+ *  Created on: Sep 11, 2019
+ *      Author: compi
+ */
+
+#ifndef SINGLETON_H_
+#define SINGLETON_H_
+
+#include <utility>
+
+template<typename T> class Singleton {
+public:
+    static T &Instance() { return *m_instance; }
+    template<typename ... Args>
+    static T &Instance(Args &&... args)
+    {
+        static T instance{ std::forward<Args>(args)... };
+        if(!m_instance)
+        	m_instance = &instance;
+        return instance;
+    }
+
+protected:
+    Singleton() = default;
+    Singleton(const Singleton &) = delete;
+    Singleton &operator=(const Singleton &) = delete;
+    virtual ~Singleton() = default;
+    static T *m_instance;
+};
+
+template<typename T> T* Singleton<T>::m_instance = nullptr;
+
+#endif /* SINGLETON_H_ */