src/mesa/main/colormac.h

   1 /* $Id: colormac.h,v 1.9 2001/03/11 18:49:11 gareth Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  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) \
  78    c = ((GLchan) IROUND((f) * CHAN_MAXF))
  79 #define UNCLAMPED_FLOAT_TO_CHAN(c, f)   \
  80    c = ( (GLchan) IROUND( CLAMP(f, 0.0, 1.0) * CHAN_MAXF) )
  81
  82 #define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
  83
  84 #define CHAN_PRODUCT(a, b) ((GLchan) ((((GLint) (a)) * ((GLint) (b))) / 65535))
  85
  86
  87 #elif CHAN_BITS == 32
  88
  89 /* XXX floating-point color channels not fully thought-out */
  90 #define BYTE_TO_CHAN(b)   ((GLfloat) ((b) * (1.0F / 127.0F)))
  91 #define UBYTE_TO_CHAN(b)  ((GLfloat) ((b) * (1.0F / 255.0F)))
  92 #define SHORT_TO_CHAN(s)  ((GLfloat) ((s) * (1.0F / 32767.0F)))
  93 #define USHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 65535.0F)))
  94 #define INT_TO_CHAN(i)    ((GLfloat) ((i) * (1.0F / 2147483647.0F)))
  95 #define UINT_TO_CHAN(i)   ((GLfloat) ((i) * (1.0F / 4294967295.0F)))
  96
  97 #define CHAN_TO_UBYTE(c)  FLOAT_TO_UBYTE(c)
  98 #define CHAN_TO_FLOAT(c)  (c)
  99
 100 #define CLAMPED_FLOAT_TO_CHAN(c, f)  c = (f)
 101 #define UNCLAMPED_FLOAT_TO_CHAN(c, f)      c = (f)
 102
 103 #define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
 104
 105 #define CHAN_PRODUCT(a, b)    ((a) * (b))
 106
 107 #else
 108
 109 #error unexpected CHAN_BITS size
 110
 111 #endif
 112
 113
 114
 115 /*
 116  * Convert 3 channels at once.
 117  */
 118 #define UNCLAMPED_FLOAT_TO_RGB_CHAN(dst, f)     \
 119 do {                                            \
 120    UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]);       \
 121    UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]);       \
 122    UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]);       \
 123 } while (0)
 124
 125
 126 /*
 127  * Convert 4 channels at once.
 128  */
 129 #define UNCLAMPED_FLOAT_TO_RGBA_CHAN(dst, f)    \
 130 do {                                            \
 131    UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]);       \
 132    UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]);       \
 133    UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]);       \
 134    UNCLAMPED_FLOAT_TO_CHAN(dst[3], f[3]);       \
 135 } while (0)
 136
 137
 138 #endif /* COLORMAC_H */