From 68832526efafb4db60e5627eba6a9051585a4eb9 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 7 Feb 2021 12:04:33 +0000
Subject: Factor a lot of maths and stuff into utility

---
 utility/maths.h | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 utility/maths.h

(limited to 'utility/maths.h')

diff --git a/utility/maths.h b/utility/maths.h
new file mode 100644
index 0000000..0b379d0
--- /dev/null
+++ b/utility/maths.h
@@ -0,0 +1,38 @@
+#ifndef MATH_H
+#define MATH_H
+
+#include <glm/glm.hpp>
+#include <glm/gtc/constants.hpp>
+#include <utility>
+
+using Arc = std::pair<float, float>;
+
+constexpr const glm::vec3 up {0, 1, 0};
+constexpr const glm::vec3 north {0, 0, 1};
+constexpr auto half_pi {glm::half_pi<float>()};
+constexpr auto pi {glm::pi<float>()};
+constexpr auto two_pi {glm::two_pi<float>()};
+
+glm::mat4 flat_orientation(const glm::vec3 & diff);
+
+float flat_angle(const glm::vec3 & diff);
+
+float round_frac(const float & v, const float & frac);
+
+constexpr inline glm::vec3
+operator!(const glm::vec2 & v)
+{
+	return {v.x, 0, v.y};
+}
+
+constexpr inline float
+arc_length(const Arc & arc)
+{
+	return arc.second - arc.first;
+}
+
+float normalize(float ang);
+
+Arc create_arc(const glm::vec3 & centre3, const glm::vec3 & e0p, const glm::vec3 & e1p);
+
+#endif
-- 
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