src/mesa/main/colormac.h

   1 /* $Id: colormac.h,v 1.12 2003/03/01 01:50:20 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  5.1
   6  *
   7  * Copyright (C) 1999-2003  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 "imports.h"
  38 #include "config.h"
  39 #include "macros.h"
  40
  41
  42 #if CHAN_BITS == 8
  43
  44 #define BYTE_TO_CHAN(b)   ((b) < 0 ? 0 : (GLchan) (b))
  45 #define UBYTE_TO_CHAN(b)  (b)
  46 #define SHORT_TO_CHAN(s)  ((s) < 0 ? 0 : (GLchan) ((s) >> 7))
  47 #define USHORT_TO_CHAN(s) ((GLchan) ((s) >> 8))
  48 #define INT_TO_CHAN(i)    ((i) < 0 ? 0 : (GLchan) ((i) >> 23))
  49 #define UINT_TO_CHAN(i)   ((GLchan) ((i) >> 24))
  50
  51 #define CHAN_TO_UBYTE(c)  (c)
  52 #define CHAN_TO_FLOAT(c)  UBYTE_TO_FLOAT(c)
  53
  54 #define CLAMPED_FLOAT_TO_CHAN(c, f)    CLAMPED_FLOAT_TO_UBYTE(c, f)
  55 #define UNCLAMPED_FLOAT_TO_CHAN(c, f)  UNCLAMPED_FLOAT_TO_UBYTE(c, f)
  56
  57 #define COPY_CHAN4(DST, SRC)  COPY_4UBV(DST, SRC)
  58
  59 #define CHAN_PRODUCT(a, b)  ((GLubyte) (((GLint)(a) * ((GLint)(b) + 1)) >> 8))
  60
  61
  62 #elif CHAN_BITS == 16
  63
  64 #define BYTE_TO_CHAN(b)   ((b) < 0 ? 0 : (((GLchan) (b)) * 516))
  65 #define UBYTE_TO_CHAN(b)  ((((GLchan) (b)) << 8) | ((GLchan) (b)))
  66 #define SHORT_TO_CHAN(s)  ((s) < 0 ? 0 : (GLchan) (s))
  67 #define USHORT_TO_CHAN(s) (s)
  68 #define INT_TO_CHAN(i)    ((i) < 0 ? 0 : (GLchan) ((i) >> 15))
  69 #define UINT_TO_CHAN(i)   ((GLchan) ((i) >> 16))
  70
  71 #define CHAN_TO_UBYTE(c)  ((c) >> 8)
  72 #define CHAN_TO_FLOAT(c)  ((GLfloat) ((c) * (1.0 / CHAN_MAXF)))
  73
  74 #define CLAMPED_FLOAT_TO_CHAN(c, f)    CLAMPED_FLOAT_TO_USHORT(c, f)
  75 #define UNCLAMPED_FLOAT_TO_CHAN(c, f)  UNCLAMPED_FLOAT_TO_USHORT(c, f)
  76
  77 #define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
  78
  79 #define CHAN_PRODUCT(a, b) ((GLchan) ((((GLuint) (a)) * ((GLuint) (b))) / 65535))
  80
  81
  82 #elif CHAN_BITS == 32
  83
  84 /* XXX floating-point color channels not fully thought-out */
  85 #define BYTE_TO_CHAN(b)   ((GLfloat) ((b) * (1.0F / 127.0F)))
  86 #define UBYTE_TO_CHAN(b)  ((GLfloat) ((b) * (1.0F / 255.0F)))
  87 #define SHORT_TO_CHAN(s)  ((GLfloat) ((s) * (1.0F / 32767.0F)))
  88 #define USHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 65535.0F)))
  89 #define INT_TO_CHAN(i)    ((GLfloat) ((i) * (1.0F / 2147483647.0F)))
  90 #define UINT_TO_CHAN(i)   ((GLfloat) ((i) * (1.0F / 4294967295.0F)))
  91
  92 #define CHAN_TO_UBYTE(c)  FLOAT_TO_UBYTE(c)
  93 #define CHAN_TO_FLOAT(c)  (c)
  94
  95 #define CLAMPED_FLOAT_TO_CHAN(c, f)  c = (f)
  96 #define UNCLAMPED_FLOAT_TO_CHAN(c, f)      c = (f)
  97
  98 #define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
  99
 100 #define CHAN_PRODUCT(a, b)    ((a) * (b))
 101
 102 #else
 103
 104 #error unexpected CHAN_BITS size
 105
 106 #endif
 107
 108
 109
 110 /*
 111  * Convert 3 channels at once.
 112  */
 113 #define UNCLAMPED_FLOAT_TO_RGB_CHAN(dst, f)     \
 114 do {                                            \
 115    UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]);       \
 116    UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]);       \
 117    UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]);       \
 118 } while (0)
 119
 120
 121 /*
 122  * Convert 4 channels at once.
 123  */
 124 #define UNCLAMPED_FLOAT_TO_RGBA_CHAN(dst, f)    \
 125 do {                                            \
 126    UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]);       \
 127    UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]);       \
 128    UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]);       \
 129    UNCLAMPED_FLOAT_TO_CHAN(dst[3], f[3]);       \
 130 } while (0)
 131
 132
 133
 134 /* Generic color packing macros
 135  * XXX We may move these into texutil.h at some point.
 136  */
 137
 138 #define PACK_COLOR_8888( a, b, c, d )                                   \
 139    (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
 140
 141 #define PACK_COLOR_888( a, b, c )                                       \
 142    (((a) << 16) | ((b) << 8) | (c))
 143
 144 #define PACK_COLOR_565( a, b, c )                                       \
 145    ((((a) & 0xf8) << 8) | (((b) & 0xfc) << 3) | (((c) & 0xf8) >> 3))
 146
 147 #define PACK_COLOR_1555( a, b, c, d )                                   \
 148    ((((b) & 0xf8) << 7) | (((c) & 0xf8) << 2) | (((d) & 0xf8) >> 3) |   \
 149     ((a) ? 0x8000 : 0))
 150
 151 #define PACK_COLOR_4444( a, b, c, d )                                   \
 152    ((((a) & 0xf0) << 8) | (((b) & 0xf0) << 4) | ((c) & 0xf0) | ((d) >> 4))
 153
 154 #define PACK_COLOR_88( a, b )                                           \
 155    (((a) << 8) | (b))
 156
 157 #define PACK_COLOR_332( a, b, c )                                       \
 158    (((a) & 0xe0) | (((b) & 0xe0) >> 3) | (((c) & 0xc0) >> 6))
 159
 160
 161 #ifdef MESA_BIG_ENDIAN
 162
 163 #define PACK_COLOR_8888_LE( a, b, c, d )        PACK_COLOR_8888( d, c, b, a )
 164
 165 #define PACK_COLOR_565_LE( a, b, c )                                    \
 166    (((a) & 0xf8) | (((b) & 0xe0) >> 5) | (((b) & 0x1c) << 11) |         \
 167    (((c) & 0xf8) << 5))
 168
 169 #define PACK_COLOR_1555_LE( a, b, c, d )                                \
 170    ((((b) & 0xf8) >> 1) | (((c) & 0xc0) >> 6) | (((c) & 0x38) << 10) |  \
 171     (((d) & 0xf8) << 5) | ((a) ? 0x80 : 0))
 172
 173 #define PACK_COLOR_4444_LE( a, b, c, d )        PACK_COLOR_4444( c, d, a, b )
 174
 175 #define PACK_COLOR_88_LE( a, b )                PACK_COLOR_88( b, a )
 176
 177 #else   /* little endian */
 178
 179 #define PACK_COLOR_8888_LE( a, b, c, d )        PACK_COLOR_8888( a, b, c, d )
 180
 181 #define PACK_COLOR_565_LE( a, b, c )            PACK_COLOR_565( a, b, c )
 182
 183 #define PACK_COLOR_1555_LE( a, b, c, d )        PACK_COLOR_1555( a, b, c, d )
 184
 185 #define PACK_COLOR_4444_LE( a, b, c, d )        PACK_COLOR_4444( a, b, c, d )
 186
 187 #define PACK_COLOR_88_LE( a, b )                PACK_COLOR_88( a, b )
 188
 189 #endif  /* endianness */
 190
 191
 192 #endif /* COLORMAC_H */