/*

 Copyright (C) 2015 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Functions for performing vector math.

 */

#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__