1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/* Copyright (C) 2010-2020 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (vector_2.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_2_H__
#define __LIBRETRO_SDK_GFX_MATH_VECTOR_2_H__
#include <stdint.h>
#include <math.h>
#include <retro_common_api.h>
#include <retro_inline.h>
RETRO_BEGIN_DECLS
typedef float vec2_t[2];
#define vec2_dot(a, b) ((a[0] * b[0]) + (a[1] * b[1]))
#define vec2_cross(a, b) ((a[0]*b[1]) - (a[1]*b[0]))
#define vec2_add(dst, src) \
dst[0] += src[0]; \
dst[1] += src[1]
#define vec2_subtract(dst, src) \
dst[0] -= src[0]; \
dst[1] -= src[1]
#define vec2_copy(dst, src) \
dst[0] = src[0]; \
dst[1] = src[1]
static INLINE float overflow(void)
{
unsigned i;
volatile float f = 1e10;
for (i = 0; i < 10; ++i)
f *= f;
return f;
}
static INLINE int16_t tofloat16(float f)
{
union uif32
{
float f;
uint32_t i;
};
int i, s, e, m;
union uif32 Entry;
Entry.f = f;
i = (int)Entry.i;
s = (i >> 16) & 0x00008000;
e = ((i >> 23) & 0x000000ff) - (127 - 15);
m = i & 0x007fffff;
if (e <= 0)
{
if (e < -10)
return (int16_t)(s);
m = (m | 0x00800000) >> (1 - e);
if (m & 0x00001000)
m += 0x00002000;
return (int16_t)(s | (m >> 13));
}
if (e == 0xff - (127 - 15))
{
if (m == 0)
return (int16_t)(s | 0x7c00);
m >>= 13;
return (int16_t)(s | 0x7c00 | m | (m == 0));
}
if (m & 0x00001000)
{
m += 0x00002000;
if (m & 0x00800000)
{
m = 0;
e += 1;
}
}
if (e > 30)
{
overflow();
return (int16_t)(s | 0x7c00);
}
return (int16_t)(s | (e << 10) | (m >> 13));
}
static INLINE unsigned int vec2_packHalf2x16(float vec0, float vec1)
{
union
{
int16_t in[2];
unsigned int out;
} u;
u.in[0] = tofloat16(vec0);
u.in[1] = tofloat16(vec1);
return u.out;
}
RETRO_END_DECLS
#endif
|
