2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 * Color-related macros
42 * Convert from GLbyte to GLchan */
44 /** \def UBYTE_TO_CHAN
45 * Convert from GLubyte to GLchan */
47 /** \def SHORT_TO_CHAN
48 * Convert from GLshort to GLchan */
50 /** \def USHORT_TO_CHAN
51 * Convert from GLushort to GLchan */
54 * Convert from GLint to GLchan */
57 * Convert from GLuint to GLchan */
59 /** \def CHAN_TO_UBYTE
60 * Convert from GLchan to GLubyte */
62 /** \def CHAN_TO_FLOAT
63 * Convert from GLchan to GLfloat */
65 /** \def CLAMPED_FLOAT_TO_CHAN
66 * Convert from GLclampf to GLchan */
68 /** \def UNCLAMPED_FLOAT_TO_CHAN
69 * Convert from GLfloat to GLchan */
72 * Copy a GLchan[4] array */
76 #define BYTE_TO_CHAN(b) ((b) < 0 ? 0 : (GLchan) (b))
77 #define UBYTE_TO_CHAN(b) (b)
78 #define SHORT_TO_CHAN(s) ((s) < 0 ? 0 : (GLchan) ((s) >> 7))
79 #define USHORT_TO_CHAN(s) ((GLchan) ((s) >> 8))
80 #define INT_TO_CHAN(i) ((i) < 0 ? 0 : (GLchan) ((i) >> 23))
81 #define UINT_TO_CHAN(i) ((GLchan) ((i) >> 24))
83 #define CHAN_TO_UBYTE(c) (c)
84 #define CHAN_TO_FLOAT(c) UBYTE_TO_FLOAT(c)
86 #define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_UBYTE(c, f)
87 #define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_UBYTE(c, f)
89 #define COPY_CHAN4(DST, SRC) COPY_4UBV(DST, SRC)
93 #define BYTE_TO_CHAN(b) ((b) < 0 ? 0 : (((GLchan) (b)) * 516))
94 #define UBYTE_TO_CHAN(b) ((((GLchan) (b)) << 8) | ((GLchan) (b)))
95 #define SHORT_TO_CHAN(s) ((s) < 0 ? 0 : (GLchan) (s))
96 #define USHORT_TO_CHAN(s) (s)
97 #define INT_TO_CHAN(i) ((i) < 0 ? 0 : (GLchan) ((i) >> 15))
98 #define UINT_TO_CHAN(i) ((GLchan) ((i) >> 16))
100 #define CHAN_TO_UBYTE(c) ((c) >> 8)
101 #define CHAN_TO_FLOAT(c) ((GLfloat) ((c) * (1.0 / CHAN_MAXF)))
103 #define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_USHORT(c, f)
104 #define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_USHORT(c, f)
106 #define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC)
108 #elif CHAN_BITS == 32
110 /* XXX floating-point color channels not fully thought-out */
111 #define BYTE_TO_CHAN(b) ((GLfloat) ((b) * (1.0F / 127.0F)))
112 #define UBYTE_TO_CHAN(b) ((GLfloat) ((b) * (1.0F / 255.0F)))
113 #define SHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 32767.0F)))
114 #define USHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 65535.0F)))
115 #define INT_TO_CHAN(i) ((GLfloat) ((i) * (1.0F / 2147483647.0F)))
116 #define UINT_TO_CHAN(i) ((GLfloat) ((i) * (1.0F / 4294967295.0F)))
118 #define CHAN_TO_UBYTE(c) FLOAT_TO_UBYTE(c)
119 #define CHAN_TO_FLOAT(c) (c)
121 #define CLAMPED_FLOAT_TO_CHAN(c, f) c = (f)
122 #define UNCLAMPED_FLOAT_TO_CHAN(c, f) c = (f)
124 #define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC)
128 #error unexpected CHAN_BITS size
134 * Convert 3 channels at once.
136 * \param dst pointer to destination GLchan[3] array.
137 * \param f pointer to source GLfloat[3] array.
139 * \sa #UNCLAMPED_FLOAT_TO_CHAN.
141 #define UNCLAMPED_FLOAT_TO_RGB_CHAN(dst, f) \
143 UNCLAMPED_FLOAT_TO_CHAN((dst)[0], (f)[0]); \
144 UNCLAMPED_FLOAT_TO_CHAN((dst)[1], (f)[1]); \
145 UNCLAMPED_FLOAT_TO_CHAN((dst)[2], (f)[2]); \
150 * Convert 4 channels at once.
152 * \param dst pointer to destination GLchan[4] array.
153 * \param f pointer to source GLfloat[4] array.
155 * \sa #UNCLAMPED_FLOAT_TO_CHAN.
157 #define UNCLAMPED_FLOAT_TO_RGBA_CHAN(dst, f) \
159 UNCLAMPED_FLOAT_TO_CHAN((dst)[0], (f)[0]); \
160 UNCLAMPED_FLOAT_TO_CHAN((dst)[1], (f)[1]); \
161 UNCLAMPED_FLOAT_TO_CHAN((dst)[2], (f)[2]); \
162 UNCLAMPED_FLOAT_TO_CHAN((dst)[3], (f)[3]); \
168 * \name Generic color packing macros. All inputs should be GLubytes.
170 * \todo We may move these into texstore.h at some point.
174 #define PACK_COLOR_8888( X, Y, Z, W ) \
175 (((X) << 24) | ((Y) << 16) | ((Z) << 8) | (W))
177 #define PACK_COLOR_8888_REV( X, Y, Z, W ) \
178 (((W) << 24) | ((Z) << 16) | ((Y) << 8) | (X))
180 #define PACK_COLOR_888( X, Y, Z ) \
181 (((X) << 16) | ((Y) << 8) | (Z))
183 #define PACK_COLOR_565( X, Y, Z ) \
184 ((((X) & 0xf8) << 8) | (((Y) & 0xfc) << 3) | (((Z) & 0xf8) >> 3))
186 #define PACK_COLOR_565_REV( X, Y, Z ) \
187 (((X) & 0xf8) | ((Y) & 0xe0) >> 5 | (((Y) & 0x1c) << 11) | (((Z) & 0xf8) << 5))
189 #define PACK_COLOR_5551( R, G, B, A ) \
190 ((((R) & 0xf8) << 8) | (((G) & 0xf8) << 3) | (((B) & 0xf8) >> 2) | \
193 #define PACK_COLOR_1555( A, B, G, R ) \
194 ((((B) & 0xf8) << 7) | (((G) & 0xf8) << 2) | (((R) & 0xf8) >> 3) | \
197 #define PACK_COLOR_1555_REV( A, B, G, R ) \
198 ((((B) & 0xf8) >> 1) | (((G) & 0xc0) >> 6) | (((G) & 0x38) << 10) | (((R) & 0xf8) << 5) | \
201 #define PACK_COLOR_4444( R, G, B, A ) \
202 ((((R) & 0xf0) << 8) | (((G) & 0xf0) << 4) | ((B) & 0xf0) | ((A) >> 4))
204 #define PACK_COLOR_4444_REV( R, G, B, A ) \
205 ((((B) & 0xf0) << 8) | (((A) & 0xf0) << 4) | ((R) & 0xf0) | ((G) >> 4))
207 #define PACK_COLOR_88( L, A ) \
210 #define PACK_COLOR_88_REV( L, A ) \
213 #define PACK_COLOR_1616( L, A ) \
216 #define PACK_COLOR_1616_REV( L, A ) \
219 #define PACK_COLOR_332( R, G, B ) \
220 (((R) & 0xe0) | (((G) & 0xe0) >> 3) | (((B) & 0xc0) >> 6))
222 #define PACK_COLOR_233( B, G, R ) \
223 (((B) & 0xc0) | (((G) & 0xe0) >> 2) | (((R) & 0xe0) >> 5))
228 #endif /* COLORMAC_H */