RetroArch/libretro-common/gfx/math/vector_2.c

/* Copyright  (C) 2010-2016 The RetroArch team
 *
 * ---------------------------------------------------------------------------------------
 * The following license statement only applies to this file (vector_2.c).
 * ---------------------------------------------------------------------------------------
 *
 * Permission is hereby granted, free of charge,
 * to any person obtaining a copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <stdint.h>
#include <math.h>

#include <gfx/math/vector_2.h>

float vec2_dot(const float *a, const float *b) 
{
	return (a[0]*b[0]) + (a[1]*b[1]);
}

float vec2_cross(const float *a, const float *b) 
{
	return (a[0]*b[1]) - (a[1]*b[0]);
}

void vec2_add(float *dst, const float *src)
{
	dst[0] += src[0];
	dst[1] += src[1];
}

void vec2_subtract(float *dst, const float *src)
{
	dst[0] -= src[0];
	dst[1] -= src[1];
}

void vec2_copy(float *dst, const float *src)
{
	dst[0] = src[0];
	dst[1] = src[1];
}