feat: implements ray

engine/inc/physics/ray.hpp

@@ -0,0 +1,98 @@
+/*
+# ______       ____   ___
+#   |     \/   ____| |___|
+#   |     |   |   \  |   |
+#-----------------------------------------------------------------------
+# Copyright 2020-2022, tyra - https://github.com/h4570/tyra
+# Licenced under Apache License 2.0
+# Wellington Carvalho <wellcoj@gmail.com>
+*/
+
+#include "math/vec4.hpp"
+
+#pragma once
+
+namespace Tyra {
+
+/**
+ * Class for raycasting.
+ */
+class Ray {
+ public:
+  /**
+   * Constructor create a ampty ray
+   *
+   */
+  Ray();
+
+  /**
+   * Constructor
+   * @param origin The origin of the ray
+   * @param direction The direction of the ray (normalized Vec4)
+   *
+   */
+  Ray(Vec4* origin, Vec4* direction);
+  ~Ray();
+
+  Vec4 origin;
+  Vec4 direction;
+
+  // Methods
+
+  /**
+   * Set origin and direction
+   */
+  void set(Vec4 origin, Vec4 direction);
+
+  /**
+   * Set origin only
+   */
+  void setOrigin(Vec4 origin);
+  void setOrigin(const float& t_x, const float& t_y, const float& t_z);
+
+  /**
+   * Set direction only
+   */
+  void setDirection(Vec4 origin);
+  void setDirection(const float& t_x, const float& t_y, const float& t_z);
+
+  /**
+   * Return Vec4 that is a given distance along this Ray
+   * @param t - the distance along the Ray to retrieve a position for.
+   */
+  Vec4 at(float t);
+
+  /**
+   * Return the distance from the Vec4 point to the origin
+   */
+  float distanceToPoint(Vec4 point);
+
+  /**
+   * Returns distance from origin to intersected mesh
+   */
+  float distanceTo(const Vec4& v) const;
+
+  /**
+   * Returns Vec4 of intersection position
+   * @param minCorner - pointer to min corner position. (bottom left)
+   * @param maxCorner - pointer to max corner position. (top right)
+   * @param distance - the box to intersect with.
+   *
+   */
+  u8 intersectBox(Vec4* minCorner, Vec4* maxCorner, float& distance);
+
+  /**
+   * Returns distance from origin to intersected mesh
+   */
+  inline const Vec4 getPosition() { return _position; };
+
+  /**
+   * Returns inverse direction
+   */
+  Vec4 invDir();
+
+ private:
+  Vec4 _position;
+};
+
+}  // namespace Tyra