src/mesa/main/colormac.h

   1
   2 /*
   3  * Mesa 3-D graphics library
   4  * Version:  5.1
   5  *
   6  * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27
  28 /*
  29  * Color-related macros
  30  */
  31
  32 #ifndef COLORMAC_H
  33 #define COLORMAC_H
  34
  35
  36 #include "imports.h"
  37 #include "config.h"
  38 #include "macros.h"
  39
  40
  41 #if CHAN_BITS == 8
  42
  43 #define BYTE_TO_CHAN(b)   ((b) < 0 ? 0 : (GLchan) (b))
  44 #define UBYTE_TO_CHAN(b)  (b)
  45 #define SHORT_TO_CHAN(s)  ((s) < 0 ? 0 : (GLchan) ((s) >> 7))
  46 #define USHORT_TO_CHAN(s) ((GLchan) ((s) >> 8))
  47 #define INT_TO_CHAN(i)    ((i) < 0 ? 0 : (GLchan) ((i) >> 23))
  48 #define UINT_TO_CHAN(i)   ((GLchan) ((i) >> 24))
  49
  50 #define CHAN_TO_UBYTE(c)  (c)
  51 #define CHAN_TO_FLOAT(c)  UBYTE_TO_FLOAT(c)
  52
  53 #define CLAMPED_FLOAT_TO_CHAN(c, f)    CLAMPED_FLOAT_TO_UBYTE(c, f)
  54 #define UNCLAMPED_FLOAT_TO_CHAN(c, f)  UNCLAMPED_FLOAT_TO_UBYTE(c, f)
  55
  56 #define COPY_CHAN4(DST, SRC)  COPY_4UBV(DST, SRC)
  57
  58 #define CHAN_PRODUCT(a, b)  ((GLubyte) (((GLint)(a) * ((GLint)(b) + 1)) >> 8))
  59
  60
  61 #elif CHAN_BITS == 16
  62
  63 #define BYTE_TO_CHAN(b)   ((b) < 0 ? 0 : (((GLchan) (b)) * 516))
  64 #define UBYTE_TO_CHAN(b)  ((((GLchan) (b)) << 8) | ((GLchan) (b)))
  65 #define SHORT_TO_CHAN(s)  ((s) < 0 ? 0 : (GLchan) (s))
  66 #define USHORT_TO_CHAN(s) (s)
  67 #define INT_TO_CHAN(i)    ((i) < 0 ? 0 : (GLchan) ((i) >> 15))
  68 #define UINT_TO_CHAN(i)   ((GLchan) ((i) >> 16))
  69
  70 #define CHAN_TO_UBYTE(c)  ((c) >> 8)
  71 #define CHAN_TO_FLOAT(c)  ((GLfloat) ((c) * (1.0 / CHAN_MAXF)))
  72
  73 #define CLAMPED_FLOAT_TO_CHAN(c, f)    CLAMPED_FLOAT_TO_USHORT(c, f)
  74 #define UNCLAMPED_FLOAT_TO_CHAN(c, f)  UNCLAMPED_FLOAT_TO_USHORT(c, f)
  75
  76 #define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
  77
  78 #define CHAN_PRODUCT(a, b) ((GLchan) ((((GLuint) (a)) * ((GLuint) (b))) / 65535))
  79
  80
  81 #elif CHAN_BITS == 32
  82
  83 /* XXX floating-point color channels not fully thought-out */
  84 #define BYTE_TO_CHAN(b)   ((GLfloat) ((b) * (1.0F / 127.0F)))
  85 #define UBYTE_TO_CHAN(b)  ((GLfloat) ((b) * (1.0F / 255.0F)))
  86 #define SHORT_TO_CHAN(s)  ((GLfloat) ((s) * (1.0F / 32767.0F)))
  87 #define USHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 65535.0F)))
  88 #define INT_TO_CHAN(i)    ((GLfloat) ((i) * (1.0F / 2147483647.0F)))
  89 #define UINT_TO_CHAN(i)   ((GLfloat) ((i) * (1.0F / 4294967295.0F)))
  90
  91 #define CHAN_TO_UBYTE(c)  FLOAT_TO_UBYTE(c)
  92 #define CHAN_TO_FLOAT(c)  (c)
  93
  94 #define CLAMPED_FLOAT_TO_CHAN(c, f)  c = (f)
  95 #define UNCLAMPED_FLOAT_TO_CHAN(c, f)      c = (f)
  96
  97 #define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
  98
  99 #define CHAN_PRODUCT(a, b)    ((a) * (b))
 100
 101 #else
 102
 103 #error unexpected CHAN_BITS size
 104
 105 #endif
 106
 107
 108
 109 /*
 110  * Convert 3 channels at once.
 111  */
 112 #define UNCLAMPED_FLOAT_TO_RGB_CHAN(dst, f)     \
 113 do {                                            \
 114    UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]);       \
 115    UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]);       \
 116    UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]);       \
 117 } while (0)
 118
 119
 120 /*
 121  * Convert 4 channels at once.
 122  */
 123 #define UNCLAMPED_FLOAT_TO_RGBA_CHAN(dst, f)    \
 124 do {                                            \
 125    UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]);       \
 126    UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]);       \
 127    UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]);       \
 128    UNCLAMPED_FLOAT_TO_CHAN(dst[3], f[3]);       \
 129 } while (0)
 130
 131
 132
 133 /* Generic color packing macros
 134  * XXX We may move these into texutil.h at some point.
 135  */
 136
 137 #define PACK_COLOR_8888( a, b, c, d )                                   \
 138    (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
 139
 140 #define PACK_COLOR_888( a, b, c )                                       \
 141    (((a) << 16) | ((b) << 8) | (c))
 142
 143 #define PACK_COLOR_565( a, b, c )                                       \
 144    ((((a) & 0xf8) << 8) | (((b) & 0xfc) << 3) | (((c) & 0xf8) >> 3))
 145
 146 #define PACK_COLOR_1555( a, b, c, d )                                   \
 147    ((((b) & 0xf8) << 7) | (((c) & 0xf8) << 2) | (((d) & 0xf8) >> 3) |   \
 148     ((a) ? 0x8000 : 0))
 149
 150 #define PACK_COLOR_4444( a, b, c, d )                                   \
 151    ((((a) & 0xf0) << 8) | (((b) & 0xf0) << 4) | ((c) & 0xf0) | ((d) >> 4))
 152
 153 #define PACK_COLOR_88( a, b )                                           \
 154    (((a) << 8) | (b))
 155
 156 #define PACK_COLOR_332( a, b, c )                                       \
 157    (((a) & 0xe0) | (((b) & 0xe0) >> 3) | (((c) & 0xc0) >> 6))
 158
 159
 160 #ifdef MESA_BIG_ENDIAN
 161
 162 #define PACK_COLOR_8888_LE( a, b, c, d )        PACK_COLOR_8888( d, c, b, a )
 163
 164 #define PACK_COLOR_565_LE( a, b, c )                                    \
 165    (((a) & 0xf8) | (((b) & 0xe0) >> 5) | (((b) & 0x1c) << 11) |         \
 166    (((c) & 0xf8) << 5))
 167
 168 #define PACK_COLOR_1555_LE( a, b, c, d )                                \
 169    ((((b) & 0xf8) >> 1) | (((c) & 0xc0) >> 6) | (((c) & 0x38) << 10) |  \
 170     (((d) & 0xf8) << 5) | ((a) ? 0x80 : 0))
 171
 172 #define PACK_COLOR_4444_LE( a, b, c, d )        PACK_COLOR_4444( c, d, a, b )
 173
 174 #define PACK_COLOR_88_LE( a, b )                PACK_COLOR_88( b, a )
 175
 176 #else   /* little endian */
 177
 178 #define PACK_COLOR_8888_LE( a, b, c, d )        PACK_COLOR_8888( a, b, c, d )
 179
 180 #define PACK_COLOR_565_LE( a, b, c )            PACK_COLOR_565( a, b, c )
 181
 182 #define PACK_COLOR_1555_LE( a, b, c, d )        PACK_COLOR_1555( a, b, c, d )
 183
 184 #define PACK_COLOR_4444_LE( a, b, c, d )        PACK_COLOR_4444( a, b, c, d )
 185
 186 #define PACK_COLOR_88_LE( a, b )                PACK_COLOR_88( a, b )
 187
 188 #endif  /* endianness */
 189
 190
 191 #endif /* COLORMAC_H */