Subversion Repositories shark

Rev

Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
55 pj 1
/* $Id: colormac.h,v 1.1 2003-02-28 11:41:58 pj Exp $ */
2
 
3
/*
4
 * Mesa 3-D graphics library
5
 * Version:  4.1
6
 *
7
 * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
8
 *
9
 * Permission is hereby granted, free of charge, to any person obtaining a
10
 * copy of this software and associated documentation files (the "Software"),
11
 * to deal in the Software without restriction, including without limitation
12
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13
 * and/or sell copies of the Software, and to permit persons to whom the
14
 * Software is furnished to do so, subject to the following conditions:
15
 *
16
 * The above copyright notice and this permission notice shall be included
17
 * in all copies or substantial portions of the Software.
18
 *
19
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
22
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25
 */
26
 
27
 
28
 
29
/*
30
 * Color-related macros
31
 */
32
 
33
#ifndef COLORMAC_H
34
#define COLORMAC_H
35
 
36
 
37
#include "glheader.h"
38
#include "config.h"
39
#include "macros.h"
40
#include "mmath.h"
41
/* Do not reference mtypes.h from this file.
42
 */
43
 
44
 
45
#if CHAN_BITS == 8
46
 
47
#define BYTE_TO_CHAN(b)   ((b) < 0 ? 0 : (GLchan) (b))
48
#define UBYTE_TO_CHAN(b)  (b)
49
#define SHORT_TO_CHAN(s)  ((s) < 0 ? 0 : (GLchan) ((s) >> 7))
50
#define USHORT_TO_CHAN(s) ((GLchan) ((s) >> 8))
51
#define INT_TO_CHAN(i)    ((i) < 0 ? 0 : (GLchan) ((i) >> 23))
52
#define UINT_TO_CHAN(i)   ((GLchan) ((i) >> 24))
53
 
54
#define CHAN_TO_UBYTE(c)  (c)
55
#define CHAN_TO_FLOAT(c)  UBYTE_TO_FLOAT(c)
56
 
57
#define CLAMPED_FLOAT_TO_CHAN(c, f)    CLAMPED_FLOAT_TO_UBYTE(c, f)
58
#define UNCLAMPED_FLOAT_TO_CHAN(c, f)  UNCLAMPED_FLOAT_TO_UBYTE(c, f)
59
 
60
#define COPY_CHAN4(DST, SRC)  COPY_4UBV(DST, SRC)
61
 
62
#define CHAN_PRODUCT(a, b)  ((GLubyte) (((GLint)(a) * ((GLint)(b) + 1)) >> 8))
63
 
64
 
65
#elif CHAN_BITS == 16
66
 
67
#define BYTE_TO_CHAN(b)   ((b) < 0 ? 0 : (((GLchan) (b)) * 516))
68
#define UBYTE_TO_CHAN(b)  ((((GLchan) (b)) << 8) | ((GLchan) (b)))
69
#define SHORT_TO_CHAN(s)  ((s) < 0 ? 0 : (GLchan) (s))
70
#define USHORT_TO_CHAN(s) (s)
71
#define INT_TO_CHAN(i)    ((i) < 0 ? 0 : (GLchan) ((i) >> 15))
72
#define UINT_TO_CHAN(i)   ((GLchan) ((i) >> 16))
73
 
74
#define CHAN_TO_UBYTE(c)  ((c) >> 8)
75
#define CHAN_TO_FLOAT(c)  ((GLfloat) ((c) * (1.0 / CHAN_MAXF)))
76
 
77
#define CLAMPED_FLOAT_TO_CHAN(c, f)    CLAMPED_FLOAT_TO_USHORT(c, f)
78
#define UNCLAMPED_FLOAT_TO_CHAN(c, f)  UNCLAMPED_FLOAT_TO_USHORT(c, f)
79
 
80
#define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
81
 
82
#define CHAN_PRODUCT(a, b) ((GLchan) ((((GLuint) (a)) * ((GLuint) (b))) / 65535))
83
 
84
 
85
#elif CHAN_BITS == 32
86
 
87
/* XXX floating-point color channels not fully thought-out */
88
#define BYTE_TO_CHAN(b)   ((GLfloat) ((b) * (1.0F / 127.0F)))
89
#define UBYTE_TO_CHAN(b)  ((GLfloat) ((b) * (1.0F / 255.0F)))
90
#define SHORT_TO_CHAN(s)  ((GLfloat) ((s) * (1.0F / 32767.0F)))
91
#define USHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 65535.0F)))
92
#define INT_TO_CHAN(i)    ((GLfloat) ((i) * (1.0F / 2147483647.0F)))
93
#define UINT_TO_CHAN(i)   ((GLfloat) ((i) * (1.0F / 4294967295.0F)))
94
 
95
#define CHAN_TO_UBYTE(c)  FLOAT_TO_UBYTE(c)
96
#define CHAN_TO_FLOAT(c)  (c)
97
 
98
#define CLAMPED_FLOAT_TO_CHAN(c, f)  c = (f)
99
#define UNCLAMPED_FLOAT_TO_CHAN(c, f)      c = (f)
100
 
101
#define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
102
 
103
#define CHAN_PRODUCT(a, b)    ((a) * (b))
104
 
105
#else
106
 
107
#error unexpected CHAN_BITS size
108
 
109
#endif
110
 
111
 
112
 
113
/*
114
 * Convert 3 channels at once.
115
 */
116
#define UNCLAMPED_FLOAT_TO_RGB_CHAN(dst, f)     \
117
do {                                            \
118
   UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]);       \
119
   UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]);       \
120
   UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]);       \
121
} while (0)
122
 
123
 
124
/*
125
 * Convert 4 channels at once.
126
 */
127
#define UNCLAMPED_FLOAT_TO_RGBA_CHAN(dst, f)    \
128
do {                                            \
129
   UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]);       \
130
   UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]);       \
131
   UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]);       \
132
   UNCLAMPED_FLOAT_TO_CHAN(dst[3], f[3]);       \
133
} while (0)
134
 
135
 
136
#endif /* COLORMAC_H */