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/* Copyright 2015 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Header file for common math functions. */
#ifndef __CROS_EC_VEC_3_H
#define __CROS_EC_VEC_3_H
#include "math_util.h"
typedef float floatv3_t[3];
typedef fp_t fpv3_t[3];
/**
* Initialized a vector to all 0.0f.
*
* @param v Pointer to the vector that will be initialized.
*/
void fpv3_zero(fpv3_t v);
/**
* Initialize a vector.
*
* @param v Pointer to the vector that will be initialized.
* @param x The value to use for the X component of v.
* @param y The value to use for the Y component of v.
* @param z The value to use for the Z component of v.
*/
void fpv3_init(fpv3_t v, fp_t x, fp_t y, fp_t z);
/**
* Multiply components of the vector by a scalar.
*
* @param v Pointer to the vector that is modified.
* @param c Scalar value to multiply v by.
*/
void fpv3_scalar_mul(fpv3_t v, fp_t c);
/**
* Subtract b from a and save the result.
*
* @param out Pointer to the vector that will be written to.
* @param a Pointer to the vector that is being subtracted from.
* @param b Pointer to the vector that is being subtracted.
*/
void fpv3_sub(fpv3_t out, const fpv3_t a, const fpv3_t b);
/**
* Adds a and b then save the result.
*
* @param out Pointer to the vector that will be written to.
* @param a Pointer to the first vector being added.
* @param b Pointer to the second vector being added.
*/
void fpv3_add(fpv3_t out, const fpv3_t a, const fpv3_t b);
/**
* Perform the dot product of two vectors.
*
* @param v Pointer to the first vector.
* @param w Pointer to the second vector.
* @return The dot product of v and w.
*/
fp_t fpv3_dot(const fpv3_t v, const fpv3_t w);
/**
* Compute the length^2 of a vector.
*
* @param v Pointer to the vector in question.
* @return The length^2 of the vector.
*/
fp_t fpv3_norm_squared(const fpv3_t v);
/**
* Compute the length of a vector.
*
* @param v Pointer to the vector in question.
* @return The length of the vector.
*/
fp_t fpv3_norm(const fpv3_t v);
#endif /* __CROS_EC_VEC_3_H */
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