From d0de60dc33df75fbcacb53a09568b14d0fd48cb9 Mon Sep 17 00:00:00 2001
From: Mel <einebeere@gmail.com>
Date: Mon, 12 Jun 2023 17:09:55 +0200
Subject: Multithreaded world generation with Perlin

---
 src/Math/Perlin.hpp | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 src/Math/Perlin.hpp

(limited to 'src/Math/Perlin.hpp')

diff --git a/src/Math/Perlin.hpp b/src/Math/Perlin.hpp
new file mode 100644
index 0000000..c31697b
--- /dev/null
+++ b/src/Math/Perlin.hpp
@@ -0,0 +1,38 @@
+#pragma once
+
+#include "Common.hpp"
+
+namespace Math::Perlin {
+
+float raw(Vector<2> pos);
+float raw(Vector<3> pos);
+
+template <size_t D>
+struct Noise {
+    static_assert(D > 1 && D < 4);
+
+    Vector<D> offset{20000.0f};
+    float scale = 15.0f;
+
+    uint octaves = 3;
+    float persistence = 0.3f;
+
+    float at(Vector<D> pos) const {
+        float result = 0;
+        float max = 0;
+        float frequency = 1;
+        float amplitude = 1;
+
+        for (uint octave = 0; octave < octaves; octave++) {
+            result += raw((pos + offset).abs() / scale * frequency) * amplitude;
+            max += amplitude;
+
+            frequency *= 2;
+            amplitude *= persistence;
+        }
+
+        return result / max;
+    }
+};
+
+}
\ No newline at end of file
-- 
cgit 1.4.1