diff -r eee644f88e93 -r 3af627f7a40f src/basics.h
--- a/src/basics.h	Sat Feb 08 00:08:57 2020 +0200
+++ b/src/basics.h	Thu Feb 13 12:51:27 2020 +0200
@@ -22,6 +22,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <cmath>
+#include <optional>
 #include <QMatrix4x4>
 #include <QObject>
 #include <QPointF>
@@ -105,5 +106,32 @@
 	return static_cast<std::make_signed_t<T>>(x);
 }
 
+
+/**
+* @brief casts double and long double - and only those types - to float
+* @param[in] x double or long double to cast
+* @returns float
+*/
+template<typename T>
+auto doubleToFloat(T x)
+	-> std::enable_if_t<
+		std::is_same_v<std::decay_t<T>, double> ||
+		std::is_same_v<std::decay_t<T>, long double
+	>, float>
+{
+	return static_cast<float>(x);
+}
+
+/**
+* @brief Casts float - and only float - to double
+* @param[in] x float to cast
+* @returns double
+*/
+template<typename T>
+auto floatToDouble(T x)
+	-> std::enable_if_t<std::is_same_v<std::decay_t<T>, float>, double>
+{
+	return static_cast<double>(x);
+}
 Q_DECLARE_METATYPE(glm::vec3)
 Q_DECLARE_METATYPE(glm::mat4)