refactor Heightmap methods with templates

src/util/functional_util.hpp

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <glm/glm.hpp>
+
+namespace util {
+    template<class T>
+    struct pow {
+        constexpr T operator()(T a, T b) const {
+            return glm::pow(a, b);
+        }
+    };
+
+    template<class T>
+    struct min {
+        constexpr T operator()(T a, T b) const {
+            return glm::min(a, b);
+        }
+    };
+
+    template<class T>
+    struct max {
+        constexpr T operator()(T a, T b) const {
+            return glm::max(a, b);
+        }
+    };
+
+    template<class T>
+    struct abs {
+        constexpr T operator()(T a) const {
+            return glm::abs(a);
+        }
+    };
+}