From d63f5ce1cb86e69da28bd74b21e9452dbd88a38f Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 28 Feb 2021 15:42:39 +0000
Subject: Move utility to lib

---
 lib/maths.h | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 lib/maths.h

(limited to 'lib/maths.h')

diff --git a/lib/maths.h b/lib/maths.h
new file mode 100644
index 0000000..89cb7cb
--- /dev/null
+++ b/lib/maths.h
@@ -0,0 +1,61 @@
+#ifndef MATH_H
+#define MATH_H
+
+#include <glm/glm.hpp>
+#include <glm/gtc/constants.hpp>
+#include <utility>
+
+struct Arc : public std::pair<float, float> {
+	using std::pair<float, float>::pair;
+
+	Arc(const glm::vec3 & centre3, const glm::vec3 & e0p, const glm::vec3 & e1p);
+
+	float
+	operator[](unsigned int i) const
+	{
+		return i ? second : first;
+	}
+};
+
+constexpr const glm::vec3 up {0, 1, 0};
+constexpr const glm::vec3 north {0, 0, 1};
+constexpr const glm::vec3 south {0, 0, -1};
+constexpr const glm::vec3 east {-1, 0, 0};
+constexpr const glm::vec3 west {1, 0, 0};
+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 vector_yaw(const glm::vec3 & diff);
+float vector_pitch(const glm::vec3 & diff);
+
+float round_frac(const float & v, const float & frac);
+
+constexpr inline glm::vec2
+operator!(const glm::vec3 & v)
+{
+	return {v.x, v.z};
+}
+
+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);
+
+std::pair<glm::vec2, bool> find_arc_centre(glm::vec2 start, float entrys, glm::vec2 end, float entrye);
+std::pair<glm::vec2, bool> find_arc_centre(glm::vec2 start, glm::vec2 ad, glm::vec2 end, glm::vec2 bd);
+std::pair<float, float> find_arcs_radius(glm::vec2 start, float entrys, glm::vec2 end, float entrye);
+float find_arcs_radius(glm::vec2 start, glm::vec2 ad, glm::vec2 end, glm::vec2 bd);
+
+#endif
-- 
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