Move noise functions to the clean header namespace.

TODO.md

@@ -4,7 +4,6 @@
     src/lol/base/types.h (vec_t shortcuts eg. vec2, ivec2, u8vec3 etc.)
     src/lol/math/constants.h
     src/lol/math/functions.h
-    src/lol/math/noise/*
 
 
 ## headers we could clean up and keep

include/lol/math/noise.h

@@ -0,0 +1,22 @@
+//
+//  Lol Engine
+//
+//  Copyright © 2010—2020 Sam Hocevar <sam@hocevar.net>
+//
+//  Lol Engine is free software. It comes without any warranty, to
+//  the extent permitted by applicable law. You can redistribute it
+//  and/or modify it under the terms of the Do What the Fuck You Want
+//  to Public License, Version 2, as published by the WTFPL Task Force.
+//  See http://www.wtfpl.net/ for more details.
+//
+
+#pragma once
+
+//
+// Noise functions
+// ———————————————
+//
+
+#include "private/perlin.h"
+#include "private/simplex.h"
+

legacy/lol/math/noise/perlin.h → include/lol/math/private/perlin.h

@@ -14,7 +14,9 @@
 
 #pragma once
 
-#include <../legacy/lol/math/noise/gradient.h>
+#include "gradient.h"
+
+#include <cmath> // std::sqrt
 
 namespace lol
 {
@@ -36,6 +38,8 @@ public:
     /* Evaluate noise at a given point */
     inline float eval(vec_t<float, N> position) const
     {
+        using std::sqrt;
+
         /* Compute the containing hypercube origin */
         vec_t<int, N> origin;
         for (int i = 0; i < N; ++i)

legacy/lol/math/noise/simplex.h → include/lol/math/private/simplex.h

@@ -14,7 +14,8 @@
 
 #pragma once
 
-#include <../legacy/lol/math/noise/gradient.h>
+#include "gradient.h"
+
 #include <lol/math/vector.h>    // vec_t
 #include <lol/math/transform.h> // mat_t
 
@@ -408,5 +409,5 @@ private:
     }
 };
 
-}
+} // namespace lol