dll/opengl/mesa/main/bitset.h

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 2006  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file bitset.h
  27  * \brief Bitset of arbitrary size definitions.
  28  * \author Michal Krol
  29  */
  30
  31 #ifndef BITSET_H
  32 #define BITSET_H
  33
  34 #include "imports.h"
  35
  36 /****************************************************************************
  37  * generic bitset implementation
  38  */
  39
  40 #define BITSET_WORD GLuint
  41 #define BITSET_WORDBITS (sizeof (BITSET_WORD) * 8)
  42
  43 /* bitset declarations
  44  */
  45 #define BITSET_DECLARE(name, size) \
  46    BITSET_WORD name[((size) + BITSET_WORDBITS - 1) / BITSET_WORDBITS]
  47
  48 /* bitset operations
  49  */
  50 #define BITSET_COPY(x, y) memcpy( (x), (y), sizeof (x) )
  51 #define BITSET_EQUAL(x, y) (memcmp( (x), (y), sizeof (x) ) == 0)
  52 #define BITSET_ZERO(x) memset( (x), 0, sizeof (x) )
  53 #define BITSET_ONES(x) memset( (x), 0xff, sizeof (x) )
  54
  55 #define BITSET_BITWORD(b) ((b) / BITSET_WORDBITS)
  56 #define BITSET_BIT(b) (1 << ((b) % BITSET_WORDBITS))
  57
  58 /* single bit operations
  59  */
  60 #define BITSET_TEST(x, b) ((x)[BITSET_BITWORD(b)] & BITSET_BIT(b))
  61 #define BITSET_SET(x, b) ((x)[BITSET_BITWORD(b)] |= BITSET_BIT(b))
  62 #define BITSET_CLEAR(x, b) ((x)[BITSET_BITWORD(b)] &= ~BITSET_BIT(b))
  63
  64 #define BITSET_MASK(b) ((b) == BITSET_WORDBITS ? ~0 : BITSET_BIT(b) - 1)
  65 #define BITSET_RANGE(b, e) (BITSET_MASK((e) + 1) & ~BITSET_MASK(b))
  66
  67 /* bit range operations
  68  */
  69 #define BITSET_TEST_RANGE(x, b, e) \
  70    (BITSET_BITWORD(b) == BITSET_BITWORD(e) ? \
  71    ((x)[BITSET_BITWORD(b)] & BITSET_RANGE(b, e)) : \
  72    (assert (!"BITSET_TEST_RANGE: bit range crosses word boundary"), 0))
  73 #define BITSET_SET_RANGE(x, b, e) \
  74    (BITSET_BITWORD(b) == BITSET_BITWORD(e) ? \
  75    ((x)[BITSET_BITWORD(b)] |= BITSET_RANGE(b, e)) : \
  76    (assert (!"BITSET_SET_RANGE: bit range crosses word boundary"), 0))
  77 #define BITSET_CLEAR_RANGE(x, b, e) \
  78    (BITSET_BITWORD(b) == BITSET_BITWORD(e) ? \
  79    ((x)[BITSET_BITWORD(b)] &= ~BITSET_RANGE(b, e)) : \
  80    (assert (!"BITSET_CLEAR_RANGE: bit range crosses word boundary"), 0))
  81
  82 /* Get first bit set in a bitset.
  83  */
  84 static inline int
  85 __bitset_ffs(const BITSET_WORD *x, int n)
  86 {
  87    int i;
  88
  89    for (i = 0; i < n; i++) {
  90       if (x[i])
  91          return _mesa_ffs(x[i]) + BITSET_WORDBITS * i;
  92    }
  93
  94    return 0;
  95 }
  96
  97 #define BITSET_FFS(x) __bitset_ffs(x, Elements(x))
  98
  99 /****************************************************************************
 100  * 64-bit bitset implementation
 101  */
 102
 103 #define BITSET64_WORD GLuint
 104 #define BITSET64_WORDBITS (sizeof (BITSET64_WORD) * 8)
 105
 106 /* bitset declarations
 107  */
 108 #define BITSET64_DECLARE(name, size) \
 109    GLuint name[2]
 110
 111 /* bitset operations
 112  */
 113 #define BITSET64_COPY(x, y) do { (x)[0] = (y)[0]; (x)[1] = (y)[1]; } while (0)
 114 #define BITSET64_EQUAL(x, y) ( (x)[0] == (y)[0] && (x)[1] == (y)[1] )
 115 #define BITSET64_ZERO(x) do { (x)[0] = 0; (x)[1] = 0; } while (0)
 116 #define BITSET64_ONES(x) do { (x)[0] = 0xFF; (x)[1] = 0xFF; } while (0)
 117
 118 #define BITSET64_BITWORD(b) ((b) / BITSET64_WORDBITS)
 119 #define BITSET64_BIT(b) (1 << ((b) % BITSET64_WORDBITS))
 120
 121 /* single bit operations
 122  */
 123 #define BITSET64_TEST(x, b) ((x)[BITSET64_BITWORD(b)] & BITSET64_BIT(b))
 124 #define BITSET64_SET(x, b) ((x)[BITSET64_BITWORD(b)] |= BITSET64_BIT(b))
 125 #define BITSET64_CLEAR(x, b) ((x)[BITSET64_BITWORD(b)] &= ~BITSET64_BIT(b))
 126
 127 #define BITSET64_MASK(b) ((b) == BITSET64_WORDBITS ? ~0 : BITSET64_BIT(b) - 1)
 128 #define BITSET64_RANGE(b, e) (BITSET64_MASK((e) + 1) & ~BITSET64_MASK(b))
 129
 130 /* bit range operations
 131  */
 132 #define BITSET64_TEST_SUBRANGE(x, b, e) \
 133    (BITSET64_BITWORD(b) == BITSET64_BITWORD(e) ? \
 134    ((x)[BITSET64_BITWORD(b)] & BITSET64_RANGE(b, e)) : \
 135    (assert (!"BITSET64_TEST_RANGE: bit range crosses word boundary"), 0))
 136 #define BITSET64_TEST_RANGE(x, b, e) \
 137    (BITSET64_BITWORD(b) == BITSET64_BITWORD(e) ? \
 138    (BITSET64_TEST_SUBRANGE(x, b, e)) : \
 139    (BITSET64_TEST_SUBRANGE(x, b, BITSET64_WORDBITS - 1) | \
 140     BITSET64_TEST_SUBRANGE(x, BITSET64_WORDBITS, e)))
 141 #define BITSET64_SET_SUBRANGE(x, b, e) \
 142    (BITSET64_BITWORD(b) == BITSET64_BITWORD(e) ? \
 143    ((x)[BITSET64_BITWORD(b)] |= BITSET64_RANGE(b, e)) : \
 144    (assert (!"BITSET64_SET_RANGE: bit range crosses word boundary"), 0))
 145 #define BITSET64_SET_RANGE(x, b, e) \
 146    (BITSET64_BITWORD(b) == BITSET64_BITWORD(e) ? \
 147    (BITSET64_SET_SUBRANGE(x, b, e)) : \
 148    (BITSET64_SET_SUBRANGE(x, b, BITSET64_WORDBITS - 1) | \
 149     BITSET64_SET_SUBRANGE(x, BITSET64_WORDBITS, e)))
 150 #define BITSET64_CLEAR_SUBRANGE(x, b, e) \
 151    (BITSET64_BITWORD(b) == BITSET64_BITWORD(e) ? \
 152    ((x)[BITSET64_BITWORD(b)] &= ~BITSET64_RANGE(b, e)) : \
 153    (assert (!"BITSET64_CLEAR_RANGE: bit range crosses word boundary"), 0))
 154 #define BITSET64_CLEAR_RANGE(x, b, e) \
 155    (BITSET64_BITWORD(b) == BITSET64_BITWORD(e) ? \
 156    (BITSET64_CLEAR_SUBRANGE(x, b, e)) : \
 157    (BITSET64_CLEAR_SUBRANGE(x, b, BITSET64_WORDBITS - 1) | \
 158     BITSET64_CLEAR_SUBRANGE(x, BITSET64_WORDBITS, e)))
 159
 160 #endif