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  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 OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22.  * OTHER DEALINGS IN THE SOFTWARE.
  23.  */
  24.  
  25. /**
  26.  * Types, macros, etc for the GLchan datatype.
  27.  * The swrast module is kind of hard-coded for 8bpp color channels but
  28.  * may be recompiled to use 16- or 32-bit color channels.  But that
  29.  * feature is seldom used and is likely broken in various ways.
  30.  */
  31.  
  32. #ifndef U_CHAN_H
  33. #define U_CHAN_H
  34.  
  35.  
  36. #include "main/config.h"
  37.  
  38.  
  39. /**
  40.  * Default bits per color channel:  8, 16 or 32
  41.  */
  42. #ifndef CHAN_BITS
  43. #define CHAN_BITS 8
  44. #endif
  45.  
  46.  
  47. /**
  48.  * Color channel data type.
  49.  */
  50. #if CHAN_BITS == 8
  51.    typedef GLubyte GLchan;
  52. #define CHAN_MAX 255
  53. #define CHAN_MAXF 255.0F
  54. #define CHAN_TYPE GL_UNSIGNED_BYTE
  55. #elif CHAN_BITS == 16
  56.    typedef GLushort GLchan;
  57. #define CHAN_MAX 65535
  58. #define CHAN_MAXF 65535.0F
  59. #define CHAN_TYPE GL_UNSIGNED_SHORT
  60. #elif CHAN_BITS == 32
  61.    typedef GLfloat GLchan;
  62. #define CHAN_MAX 1.0
  63. #define CHAN_MAXF 1.0F
  64. #define CHAN_TYPE GL_FLOAT
  65. #else
  66. #error "illegal number of color channel bits"
  67. #endif
  68.  
  69.  
  70. #if CHAN_BITS == 8
  71.  
  72. #define CHAN_TO_UBYTE(c)  (c)
  73. #define CHAN_TO_USHORT(c) (((c) << 8) | (c))
  74. #define CHAN_TO_SHORT(c)  (((c) << 7) | ((c) >> 1))
  75. #define CHAN_TO_FLOAT(c)  UBYTE_TO_FLOAT(c)
  76.  
  77. #define CLAMPED_FLOAT_TO_CHAN(c, f)    CLAMPED_FLOAT_TO_UBYTE(c, f)
  78. #define UNCLAMPED_FLOAT_TO_CHAN(c, f)  UNCLAMPED_FLOAT_TO_UBYTE(c, f)
  79.  
  80. #define COPY_CHAN4(DST, SRC)  COPY_4UBV(DST, SRC)
  81.  
  82. #elif CHAN_BITS == 16
  83.  
  84. #define CHAN_TO_UBYTE(c)  ((c) >> 8)
  85. #define CHAN_TO_USHORT(c) (c)
  86. #define CHAN_TO_SHORT(c)  ((c) >> 1)
  87. #define CHAN_TO_FLOAT(c)  ((GLfloat) ((c) * (1.0 / CHAN_MAXF)))
  88.  
  89. #define CLAMPED_FLOAT_TO_CHAN(c, f)    CLAMPED_FLOAT_TO_USHORT(c, f)
  90. #define UNCLAMPED_FLOAT_TO_CHAN(c, f)  UNCLAMPED_FLOAT_TO_USHORT(c, f)
  91.  
  92. #define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
  93.  
  94. #elif CHAN_BITS == 32
  95.  
  96. #define CHAN_TO_UBYTE(c)  FLOAT_TO_UBYTE(c)
  97. #define CHAN_TO_USHORT(c) ((GLushort) (CLAMP((c), 0.0f, 1.0f) * 65535.0))
  98. #define CHAN_TO_SHORT(c)  ((GLshort) (CLAMP((c), 0.0f, 1.0f) * 32767.0))
  99. #define CHAN_TO_FLOAT(c)  (c)
  100.  
  101. #define CLAMPED_FLOAT_TO_CHAN(c, f)  c = (f)
  102. #define UNCLAMPED_FLOAT_TO_CHAN(c, f)      c = (f)
  103.  
  104. #define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
  105.  
  106. #else
  107.  
  108. #error unexpected CHAN_BITS size
  109.  
  110. #endif
  111.  
  112.  
  113. /**
  114.  * Convert 4 floats to GLchan values.
  115.  * \param dst pointer to destination GLchan[4] array.
  116.  * \param f pointer to source GLfloat[4] array.
  117.  */
  118. #define UNCLAMPED_FLOAT_TO_RGBA_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.    UNCLAMPED_FLOAT_TO_CHAN((dst)[3], (f)[3]);   \
  124. } while (0)
  125.  
  126.  
  127.  
  128. #endif /* U_CHAN_H */
  129.