| 1 | /* Copyright (C) 2010-2020 The RetroArch team |
| 2 | * |
| 3 | * --------------------------------------------------------------------------------------- |
| 4 | * The following license statement only applies to this file (vector_2.h). |
| 5 | * --------------------------------------------------------------------------------------- |
| 6 | * |
| 7 | * Permission is hereby granted, free of charge, |
| 8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), |
| 9 | * to deal in the Software without restriction, including without limitation the rights to |
| 10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, |
| 11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
| 16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 21 | */ |
| 22 | |
| 23 | #ifndef __LIBRETRO_SDK_GFX_MATH_VECTOR_2_H__ |
| 24 | #define __LIBRETRO_SDK_GFX_MATH_VECTOR_2_H__ |
| 25 | |
| 26 | #include <stdint.h> |
| 27 | #include <math.h> |
| 28 | |
| 29 | #include <retro_common_api.h> |
| 30 | #include <retro_inline.h> |
| 31 | |
| 32 | RETRO_BEGIN_DECLS |
| 33 | |
| 34 | typedef float vec2_t[2]; |
| 35 | |
| 36 | #define vec2_dot(a, b) ((a[0] * b[0]) + (a[1] * b[1])) |
| 37 | |
| 38 | #define vec2_cross(a, b) ((a[0]*b[1]) - (a[1]*b[0])) |
| 39 | |
| 40 | #define vec2_add(dst, src) \ |
| 41 | dst[0] += src[0]; \ |
| 42 | dst[1] += src[1] |
| 43 | |
| 44 | #define vec2_subtract(dst, src) \ |
| 45 | dst[0] -= src[0]; \ |
| 46 | dst[1] -= src[1] |
| 47 | |
| 48 | #define vec2_copy(dst, src) \ |
| 49 | dst[0] = src[0]; \ |
| 50 | dst[1] = src[1] |
| 51 | |
| 52 | static INLINE float overflow(void) |
| 53 | { |
| 54 | unsigned i; |
| 55 | volatile float f = 1e10; |
| 56 | |
| 57 | for (i = 0; i < 10; ++i) |
| 58 | f *= f; |
| 59 | return f; |
| 60 | } |
| 61 | |
| 62 | static INLINE int16_t tofloat16(float f) |
| 63 | { |
| 64 | union uif32 |
| 65 | { |
| 66 | float f; |
| 67 | uint32_t i; |
| 68 | }; |
| 69 | |
| 70 | int i, s, e, m; |
| 71 | union uif32 Entry; |
| 72 | Entry.f = f; |
| 73 | i = (int)Entry.i; |
| 74 | s = (i >> 16) & 0x00008000; |
| 75 | e = ((i >> 23) & 0x000000ff) - (127 - 15); |
| 76 | m = i & 0x007fffff; |
| 77 | |
| 78 | if (e <= 0) |
| 79 | { |
| 80 | if (e < -10) |
| 81 | return (int16_t)(s); |
| 82 | |
| 83 | m = (m | 0x00800000) >> (1 - e); |
| 84 | |
| 85 | if (m & 0x00001000) |
| 86 | m += 0x00002000; |
| 87 | |
| 88 | return (int16_t)(s | (m >> 13)); |
| 89 | } |
| 90 | |
| 91 | if (e == 0xff - (127 - 15)) |
| 92 | { |
| 93 | if (m == 0) |
| 94 | return (int16_t)(s | 0x7c00); |
| 95 | |
| 96 | m >>= 13; |
| 97 | |
| 98 | return (int16_t)(s | 0x7c00 | m | (m == 0)); |
| 99 | } |
| 100 | |
| 101 | if (m & 0x00001000) |
| 102 | { |
| 103 | m += 0x00002000; |
| 104 | |
| 105 | if (m & 0x00800000) |
| 106 | { |
| 107 | m = 0; |
| 108 | e += 1; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | if (e > 30) |
| 113 | { |
| 114 | overflow(); |
| 115 | |
| 116 | return (int16_t)(s | 0x7c00); |
| 117 | } |
| 118 | |
| 119 | return (int16_t)(s | (e << 10) | (m >> 13)); |
| 120 | } |
| 121 | |
| 122 | static INLINE unsigned int vec2_packHalf2x16(float vec0, float vec1) |
| 123 | { |
| 124 | union |
| 125 | { |
| 126 | int16_t in[2]; |
| 127 | unsigned int out; |
| 128 | } u; |
| 129 | |
| 130 | u.in[0] = tofloat16(vec0); |
| 131 | u.in[1] = tofloat16(vec1); |
| 132 | |
| 133 | return u.out; |
| 134 | } |
| 135 | |
| 136 | RETRO_END_DECLS |
| 137 | |
| 138 | #endif |