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Add vector_3.c

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twinaphex 2016-05-15 06:46:41 +02:00
parent 271f4b6f8d
commit f8982a89d7
2 changed files with 124 additions and 0 deletions
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79
libretro-common/gfx/math/vector_3.c Normal file
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/* Copyright (C) 2010-2016 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (vector_3.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_3.h>
float vec3_dot(const float *a, const float *b)
{
return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
}
void vec3_cross(float* dst, const float *a, const float *b)
{
dst[0] = a[1]*b[2] - a[2]*b[1];
dst[1] = a[2]*b[0] - a[0]*b[2];
dst[2] = a[0]*b[1] - a[1]*b[0];
}
float vec3_length(const float *a)
{
float length_sq = vec3_dot(a,a);
float length = sqrtf(length_sq);
return length;
}
void vec3_add(float *dst, const float *src)
{
dst[0] += src[0];
dst[1] += src[1];
dst[2] += src[2];
}
void vec3_subtract(float *dst, const float *src)
{
dst[0] -= src[0];
dst[1] -= src[1];
dst[2] -= src[2];
}
void vec3_scale(float *dst, const float scale)
{
dst[0] *= scale;
dst[1] *= scale;
dst[2] *= scale;
}
void vec3_copy(float *dst, const float *src)
{
dst[0] = src[0];
dst[1] = src[1];
dst[2] = src[2];
}
void vec3_normalize(float *dst)
{
float length = vec3_length(dst);
vec3_scale(dst,1.0f/length);
}

45
libretro-common/include/gfx/math/vector_3.h Normal file
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/* Copyright (C) 2010-2016 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (vector_3.h).
* ---------------------------------------------------------------------------------------
*
* 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.
*/
#ifndef __LIBRETRO_SDK_GFX_MATH_VECTOR_3_H__
#define __LIBRETRO_SDK_GFX_MATH_VECTOR_3_H__
#include <stdint.h>
float vec3_dot(const float *a, const float *b);
void vec3_cross(float* dst, const float *a, const float *b);
float vec3_length(const float *a);
void vec3_add(float *dst, const float *src);
void vec3_subtract(float *dst, const float *src);
void vec3_scale(float *dst, const float scale);
void vec3_copy(float *dst, const float *src);
void vec3_normalize(float *dst);
#endif