PhatAC/MathLib.h

#pragma once
#include <math.h>

// #define F_EPSILON (0.0002f) 

class Frame;

class Vec2D
{
public:
	inline Vec2D() {
	}

	inline Vec2D(float _x, float _y) {
		x = _x;
		y = _y;
	}

	inline Vec2D& operator+=(const Vec2D& quant) {
		x += quant.x;
		y += quant.y;
		return *this;
	}

	ULONG pack_size();
	ULONG Pack(BYTE** ppData, ULONG iSize);
	BOOL UnPack(BYTE** ppData, ULONG iSize);

	float x, y;
};

Vector cross_product(const Vector& v1, const Vector& v2);

// Imaginary class, either entirely inlined by Turbine or non-existant.
class Quaternion
{
public:
	inline Quaternion() {
	}

	inline Quaternion(float _w, float _x, float _y, float _z) {
		w = _w;
		x = _x;
		y = _y;
		z = _z;
	}

	// Should probably be renamed. It's not the length of the quaternion!!
	inline float magnitude() const {
		return (float)sqrt((x * x) + (y * y) + (z * z) + (w * w));
	}

	inline ULONG pack_size() {
		return(sizeof(float) * 4);
	}
	inline ULONG Pack(BYTE** ppData, ULONG iSize) {
		// The client performs no size check, but we will.
		ULONG PackSize = pack_size();

		if (iSize >= PackSize) {
			PACK(float, w);
			PACK(float, x);
			PACK(float, y);
			PACK(float, z);
		}
		return PackSize;
	}
	inline BOOL UnPack(BYTE** ppData, ULONG iSize) {
		if (iSize < pack_size())
			return FALSE;

		UNPACK(float, w);
		UNPACK(float, x);
		UNPACK(float, y);
		UNPACK(float, z);

		return TRUE;
	}

	BOOL IsValid() const;
	void normalize();
	float dot_product(const Quaternion& q) const;

	float w, x, y, z;
};

class Ray
{
public:
	Vector m_origin;
	Vector m_direction;
};

class Plane
{
public:
	// Constructors
	Plane();
	Plane(Vector& Vect1, Vector& Vect2);

	// Pack Functions
	ULONG pack_size();
	BOOL UnPack(BYTE** ppData, ULONG iSize);

	// Math Functions
	float dot_product(const Vector& point);
	int which_side(const Vector& point, float near_dist);
	BOOL compute_time_of_intersection(const Ray& ray, float *time);

	Vector m_normal;
	float m_dist;
};