From 93cdd830055525729a6d9c34696ff1ff312bdc41 Mon Sep 17 00:00:00 2001
From: scorpioblood <77296181+scorpioblood@users.noreply.github.com>
Date: Wed, 22 May 2024 21:55:03 +0200
Subject: [PATCH] Add ray.

---
 Engine/src/Runtime/Core/public/Math/Ray.hpp | 127 ++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 Engine/src/Runtime/Core/public/Math/Ray.hpp

diff --git a/Engine/src/Runtime/Core/public/Math/Ray.hpp b/Engine/src/Runtime/Core/public/Math/Ray.hpp
new file mode 100644
index 0000000..7ea1c79
--- /dev/null
+++ b/Engine/src/Runtime/Core/public/Math/Ray.hpp
@@ -0,0 +1,127 @@
+#pragma once
+
+#include "Core/public/Math/Boilerplate.h"
+#include "Core/public/Math/MathFwd.h"
+
+#include "Core/public/Math/Vector3.hpp"
+
+namespace Phanes::Core::Math
+{
+
+    // Ray with origin and direction (L = p + t * v)
+
+    template<RealType T>
+    struct TRay
+    {
+    public:
+        using Real = T;
+
+        TVector3<Real> origin;
+        TVector3<Real> direction;
+
+    public:
+        /** Default constructor */
+        TRay() = default;
+
+        /** Copy constructor */
+        TRay(const TRay<Real>& r) : direction(r.direction), origin(r.origin) {};
+
+        /** Move constructor */
+        TRay(TRay<Real>&& r) : direction(std::move(r.direction)), origin(std::move(r.origin)) {};
+
+        /**
+         * Construct ray from origin and direction.
+         *
+         * @param(direction) Direction
+         * @param(origin) Origin
+         */
+
+        TRay(const TVector3<Real>& direction, const TVector3<Real>& origin) : direction(direction), origin(origin) {};
+
+    };
+
+    // ================== //
+    //   TRay operators   //
+    // ================== //
+
+
+    /**
+     * Tests two rays for equality
+     * 
+     * @param(r1) Ray one
+     * @param(r2) Ray two
+     * 
+     * @return True, if same and false, if not.
+     */
+
+    template<RealType T>
+    FORCEINLINE bool operator== (const TRay<T>& r1, const TRay<T>& r2)
+    {
+        return (r1.origin == r2.origin && r1.direction == r2.direction);
+    }
+
+    /**
+     * Tests two rays for inequality
+     *
+     * @param(r1) Ray one
+     * @param(r2) Ray two
+     *
+     * @return True, if not same and false, if same.
+     */
+
+    template<RealType T>
+    FORCEINLINE bool operator== (const TRay<T>& r1, const TRay<T>& r2)
+    {
+        return (r1.origin != r2.origin || r1.direction != r2.direction);
+    }
+
+    // ================== //
+    //   TRay functions   //
+    // ================== //
+
+
+    /**
+     * Gets the point of the ray at a given parameter
+     *
+     * @param(r1) Ray
+     * @param(t) Parameter
+     *
+     * @return Point at t
+     */
+
+    template<RealType T>
+    TVector3<T> PointAt(const TRay<T>& r1, T t)
+    {
+        return r1.origin + r1.direction * t;
+    }
+
+    /** 
+     * Gets parameter necessary to travel to query point on line.
+     * 
+     * @param(r1) Ray
+     * @param(p1) Query point
+     * 
+     * @return parameter t
+     */
+
+    template<RealType T>
+    TVector3<T> GetParameter(const TRay<T>& r1, const TVector3<T>& p1)
+    {
+        return DotP((p1 - r1.origin), r1.direction);
+    }
+
+    /**
+     * Tests wether two ray point in the same direction (Not if origin).
+     * 
+     * @param(r1) Ray one
+     * @param(r2) Ray two
+     * 
+     * @return True, if both rays point in the same direction, false if not.
+     */
+
+    template<RealType T>
+    inline bool SameDirection(const TRay<T>& r1, const TRay<T>& r2)
+    {
+        return (r1.direction == r1.direction);
+    }
+}
\ No newline at end of file