Add some nice math helping functions

source/include/math_helper.h

@@ -0,0 +1,15 @@
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Math helping function header
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+
+#ifndef DORAYME_MATH_HELPER_H
+#define DORAYME_MATH_HELPER_H
+
+bool double_equal(double a, double b);
+
+#endif //DORAYME_MATH_HELPER_H

source/math_helper.cpp

@@ -0,0 +1,17 @@
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Math helping functions
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+
+#include <math.h>
+#include <float.h>
+#include <math_helper.h>
+
+bool double_equal(double a, double b)
+{
+    return fabs(a - b) < DBL_EPSILON;
+}