/*
 * Apple // emulator for *nix
 *
 * This software package is subject to the GNU General Public License
 * version 2 or later (your choice) as published by the Free Software
 * Foundation.
 *
 * THERE ARE NO WARRANTIES WHATSOEVER.
 *
 */

// Modified sample code from https://developer.apple.com/library/mac/samplecode/GLEssentials/Introduction/Intro.html

#ifndef __VECTOR_UTIL_H__
#define __VECTOR_UTIL_H__

// A Vector is floating point array with either 3 or 4 components
// functions with the vec4 prefix require 4 elements in the array
// functions with vec3 prefix require only 3 elements in the array

// Subtracts one 4D vector to another
void vec4Add(float *vec, const float *lhs, const float *rhs);

// Subtracts one 4D vector from another
void vec4Subtract(float *vec, const float *lhs, const float *rhs);

// Multiplys one 4D vector by another
void vec4Multiply(float *vec, const float *lhs, const float *rhs);

// Divides one 4D vector by another
void vec4Divide(float *vec, const float *lhs, const float *rhs);

// Subtracts one 4D vector to another
void vec3Add(float *vec, const float *lhs, const float *rhs);

// Subtracts one 4D vector from another
void vec3Subtract(float *vec, const float *lhs, const float *rhs);

// Multiplys one 4D vector by another
void vec3Multiply(float *vec, const float *lhs, const float *rhs);

// Divides one 4D vector by another
void vec3Divide(float *vec, const float *lhs, const float *rhs);

// Calculates the Cross Product of a 3D vector
void vec3CrossProduct(float *vec, const float *lhs, const float *rhs);

// Normalizes a 3D vector
void vec3Normalize(float *vec, const float *src);

// Returns the Dot Product of 2 3D vectors
float vec3DotProduct(const float *lhs, const float *rhs);

// Returns the Dot Product of 2 4D vectors
float vec4DotProduct(const float *lhs, const float *rhs);

// Returns the length of a 3D vector
// (i.e the distance of a point from the origin)
float vec3Length(const float *vec);

// Returns the distance between two 3D points
float vec3Distance(const float *pointA, const float *pointB);

#endif //__VECTOR_UTIL_H__