mirror of
https://github.com/libretro/RetroArch.git
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139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/* Copyright (C) 2010-2020 The RetroArch team
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*
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* ---------------------------------------------------------------------------------------
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* The following license statement only applies to this file (vector_2.h).
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* ---------------------------------------------------------------------------------------
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*
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* Permission is hereby granted, free of charge,
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* to any person obtaining a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __LIBRETRO_SDK_GFX_MATH_VECTOR_2_H__
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#define __LIBRETRO_SDK_GFX_MATH_VECTOR_2_H__
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#include <stdint.h>
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#include <math.h>
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#include <retro_common_api.h>
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#include <retro_inline.h>
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RETRO_BEGIN_DECLS
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typedef float vec2_t[2];
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#define vec2_dot(a, b) ((a[0] * b[0]) + (a[1] * b[1]))
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#define vec2_cross(a, b) ((a[0]*b[1]) - (a[1]*b[0]))
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#define vec2_add(dst, src) \
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dst[0] += src[0]; \
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dst[1] += src[1]
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#define vec2_subtract(dst, src) \
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dst[0] -= src[0]; \
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dst[1] -= src[1]
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#define vec2_copy(dst, src) \
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dst[0] = src[0]; \
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dst[1] = src[1]
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static INLINE float overflow(void)
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{
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unsigned i;
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volatile float f = 1e10;
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for (i = 0; i < 10; ++i)
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f *= f;
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return f;
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}
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static INLINE int16_t tofloat16(float f)
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{
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union uif32
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{
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float f;
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uint32_t i;
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};
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int i, s, e, m;
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union uif32 Entry;
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Entry.f = f;
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i = (int)Entry.i;
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s = (i >> 16) & 0x00008000;
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e = ((i >> 23) & 0x000000ff) - (127 - 15);
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m = i & 0x007fffff;
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if (e <= 0)
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{
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if (e < -10)
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return (int16_t)(s);
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m = (m | 0x00800000) >> (1 - e);
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if (m & 0x00001000)
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m += 0x00002000;
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return (int16_t)(s | (m >> 13));
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}
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if (e == 0xff - (127 - 15))
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{
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if (m == 0)
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return (int16_t)(s | 0x7c00);
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m >>= 13;
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return (int16_t)(s | 0x7c00 | m | (m == 0));
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}
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if (m & 0x00001000)
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{
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m += 0x00002000;
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if (m & 0x00800000)
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{
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m = 0;
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e += 1;
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}
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}
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if (e > 30)
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{
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overflow();
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return (int16_t)(s | 0x7c00);
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}
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return (int16_t)(s | (e << 10) | (m >> 13));
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}
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static INLINE unsigned int vec2_packHalf2x16(float vec0, float vec1)
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{
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union
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{
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int16_t in[2];
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unsigned int out;
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} u;
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u.in[0] = tofloat16(vec0);
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u.in[1] = tofloat16(vec1);
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return u.out;
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}
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RETRO_END_DECLS
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#endif
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