reactos/dll/opengl/mesa/swrast/s_chan.h

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2011  VMware, Inc.  All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  20  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * Types, macros, etc for the GLchan datatype.
  26  * The swrast module is kind of hard-coded for 8bpp color channels but
  27  * may be recompiled to use 16- or 32-bit color channels.  But that
  28  * feature is seldom used and is likely broken in various ways.
  29  */
  30
  31 #ifndef U_CHAN_H
  32 #define U_CHAN_H
  33
  34
  35 #include "main/config.h"
  36
  37
  38 /**
  39  * Color channel data type.
  40  */
  41 #if CHAN_BITS == 8
  42    typedef GLubyte GLchan;
  43 #define CHAN_MAX 255
  44 #define CHAN_MAXF 255.0F
  45 #define CHAN_TYPE GL_UNSIGNED_BYTE
  46 #elif CHAN_BITS == 16
  47    typedef GLushort GLchan;
  48 #define CHAN_MAX 65535
  49 #define CHAN_MAXF 65535.0F
  50 #define CHAN_TYPE GL_UNSIGNED_SHORT
  51 #elif CHAN_BITS == 32
  52    typedef GLfloat GLchan;
  53 #define CHAN_MAX 1.0
  54 #define CHAN_MAXF 1.0F
  55 #define CHAN_TYPE GL_FLOAT
  56 #else
  57 #error "illegal number of color channel bits"
  58 #endif
  59
  60
  61 #if CHAN_BITS == 8
  62
  63 #define CHAN_TO_UBYTE(c)  (c)
  64 #define CHAN_TO_USHORT(c) (((c) << 8) | (c))
  65 #define CHAN_TO_SHORT(c)  (((c) << 7) | ((c) >> 1))
  66 #define CHAN_TO_FLOAT(c)  UBYTE_TO_FLOAT(c)
  67
  68 #define CLAMPED_FLOAT_TO_CHAN(c, f)    CLAMPED_FLOAT_TO_UBYTE(c, f)
  69 #define UNCLAMPED_FLOAT_TO_CHAN(c, f)  UNCLAMPED_FLOAT_TO_UBYTE(c, f)
  70
  71 #define COPY_CHAN4(DST, SRC)  COPY_4UBV(DST, SRC)
  72
  73 #elif CHAN_BITS == 16
  74
  75 #define CHAN_TO_UBYTE(c)  ((c) >> 8)
  76 #define CHAN_TO_USHORT(c) (c)
  77 #define CHAN_TO_SHORT(c)  ((c) >> 1)
  78 #define CHAN_TO_FLOAT(c)  ((GLfloat) ((c) * (1.0 / CHAN_MAXF)))
  79
  80 #define CLAMPED_FLOAT_TO_CHAN(c, f)    CLAMPED_FLOAT_TO_USHORT(c, f)
  81 #define UNCLAMPED_FLOAT_TO_CHAN(c, f)  UNCLAMPED_FLOAT_TO_USHORT(c, f)
  82
  83 #define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
  84
  85 #elif CHAN_BITS == 32
  86
  87 #define CHAN_TO_UBYTE(c)  FLOAT_TO_UBYTE(c)
  88 #define CHAN_TO_USHORT(c) ((GLushort) (CLAMP((c), 0.0f, 1.0f) * 65535.0))
  89 #define CHAN_TO_SHORT(c)  ((GLshort) (CLAMP((c), 0.0f, 1.0f) * 32767.0))
  90 #define CHAN_TO_FLOAT(c)  (c)
  91
  92 #define CLAMPED_FLOAT_TO_CHAN(c, f)  c = (f)
  93 #define UNCLAMPED_FLOAT_TO_CHAN(c, f)      c = (f)
  94
  95 #define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
  96
  97 #else
  98
  99 #error unexpected CHAN_BITS size
 100
 101 #endif
 102
 103
 104 /**
 105  * Convert 4 floats to GLchan values.
 106  * \param dst pointer to destination GLchan[4] array.
 107  * \param f pointer to source GLfloat[4] array.
 108  */
 109 #define UNCLAMPED_FLOAT_TO_RGBA_CHAN(dst, f)    \
 110 do {                                            \
 111    UNCLAMPED_FLOAT_TO_CHAN((dst)[0], (f)[0]);   \
 112    UNCLAMPED_FLOAT_TO_CHAN((dst)[1], (f)[1]);   \
 113    UNCLAMPED_FLOAT_TO_CHAN((dst)[2], (f)[2]);   \
 114    UNCLAMPED_FLOAT_TO_CHAN((dst)[3], (f)[3]);   \
 115 } while (0)
 116
 117
 118
 119 #endif /* U_CHAN_H */