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
|
/* $Id: colormac.h,v 1.9 2001/03/11 18:49:11 gareth Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
*
* 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
* BRIAN PAUL 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.
*/
/*
* Color-related macros
*/
#ifndef COLORMAC_H
#define COLORMAC_H
#include "glheader.h"
#include "config.h"
#include "macros.h"
#include "mmath.h"
/* Do not reference mtypes.h from this file.
*/
#if CHAN_BITS == 8
#define BYTE_TO_CHAN(b) ((b) < 0 ? 0 : (GLchan) (b))
#define UBYTE_TO_CHAN(b) (b)
#define SHORT_TO_CHAN(s) ((s) < 0 ? 0 : (GLchan) ((s) >> 7))
#define USHORT_TO_CHAN(s) ((GLchan) ((s) >> 8))
#define INT_TO_CHAN(i) ((i) < 0 ? 0 : (GLchan) ((i) >> 23))
#define UINT_TO_CHAN(i) ((GLchan) ((i) >> 24))
#define CHAN_TO_UBYTE(c) (c)
#define CHAN_TO_FLOAT(c) UBYTE_TO_FLOAT(c)
#define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_UBYTE(c, f)
#define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_UBYTE(c, f)
#define COPY_CHAN4(DST, SRC) COPY_4UBV(DST, SRC)
#define CHAN_PRODUCT(a, b) ((GLubyte) (((GLint)(a) * ((GLint)(b) + 1)) >> 8))
#elif CHAN_BITS == 16
#define BYTE_TO_CHAN(b) ((b) < 0 ? 0 : (((GLchan) (b)) * 516))
#define UBYTE_TO_CHAN(b) ((((GLchan) (b)) << 8) | ((GLchan) (b)))
#define SHORT_TO_CHAN(s) ((s) < 0 ? 0 : (GLchan) (s))
#define USHORT_TO_CHAN(s) (s)
#define INT_TO_CHAN(i) ((i) < 0 ? 0 : (GLchan) ((i) >> 15))
#define UINT_TO_CHAN(i) ((GLchan) ((i) >> 16))
#define CHAN_TO_UBYTE(c) ((c) >> 8)
#define CHAN_TO_FLOAT(c) ((GLfloat) ((c) * (1.0 / CHAN_MAXF)))
#define CLAMPED_FLOAT_TO_CHAN(c, f) \
c = ((GLchan) IROUND((f) * CHAN_MAXF))
#define UNCLAMPED_FLOAT_TO_CHAN(c, f) \
c = ( (GLchan) IROUND( CLAMP(f, 0.0, 1.0) * CHAN_MAXF) )
#define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC)
#define CHAN_PRODUCT(a, b) ((GLchan) ((((GLint) (a)) * ((GLint) (b))) / 65535))
#elif CHAN_BITS == 32
/* XXX floating-point color channels not fully thought-out */
#define BYTE_TO_CHAN(b) ((GLfloat) ((b) * (1.0F / 127.0F)))
#define UBYTE_TO_CHAN(b) ((GLfloat) ((b) * (1.0F / 255.0F)))
#define SHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 32767.0F)))
#define USHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 65535.0F)))
#define INT_TO_CHAN(i) ((GLfloat) ((i) * (1.0F / 2147483647.0F)))
#define UINT_TO_CHAN(i) ((GLfloat) ((i) * (1.0F / 4294967295.0F)))
#define CHAN_TO_UBYTE(c) FLOAT_TO_UBYTE(c)
#define CHAN_TO_FLOAT(c) (c)
#define CLAMPED_FLOAT_TO_CHAN(c, f) c = (f)
#define UNCLAMPED_FLOAT_TO_CHAN(c, f) c = (f)
#define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC)
#define CHAN_PRODUCT(a, b) ((a) * (b))
#else
#error unexpected CHAN_BITS size
#endif
/*
* Convert 3 channels at once.
*/
#define UNCLAMPED_FLOAT_TO_RGB_CHAN(dst, f) \
do { \
UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]); \
UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]); \
UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]); \
} while (0)
/*
* Convert 4 channels at once.
*/
#define UNCLAMPED_FLOAT_TO_RGBA_CHAN(dst, f) \
do { \
UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]); \
UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]); \
UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]); \
UNCLAMPED_FLOAT_TO_CHAN(dst[3], f[3]); \
} while (0)
#endif /* COLORMAC_H */
|
