src/util/imports.h

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   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 /**
  27  * \file imports.h
  28  * Standard C library function wrappers.
  29  *
  30  * This file provides wrappers for all the standard C library functions
  31  * like malloc(), free(), printf(), getenv(), etc.
  32  */
  33
  34
  35 #ifndef IMPORTS_H
  36 #define IMPORTS_H
  37
  38
  39 #include <stdlib.h>
  40 #include <stdarg.h>
  41 #include <string.h>
  42 #include "util/compiler.h"
  43 #include "util/bitscan.h"
  44 #include "util/u_memory.h"
  45
  46 #ifdef __cplusplus
  47 extern "C" {
  48 #endif
  49
  50
  51 /*
  52  * For GL_ARB_vertex_buffer_object we need to treat vertex array pointers
  53  * as offsets into buffer stores.  Since the vertex array pointer and
  54  * buffer store pointer are both pointers and we need to add them, we use
  55  * this macro.
  56  * Both pointers/offsets are expressed in bytes.
  57  */
  58 #define ADD_POINTERS(A, B)  ( (uint8_t *) (A) + (uintptr_t) (B) )
  59
  60
  61 /**
  62  * Sometimes we treat floats as ints.  On x86 systems, moving a float
  63  * as an int (thereby using integer registers instead of FP registers) is
  64  * a performance win.  Typically, this can be done with ordinary casts.
  65  * But with gcc's -fstrict-aliasing flag (which defaults to on in gcc 3.0)
  66  * these casts generate warnings.
  67  * The following union typedef is used to solve that.
  68  */
  69 typedef union { float f; int i; unsigned u; } fi_type;
  70
  71
  72
  73 /*@}*/
  74
  75
  76 /**
  77  * finite macro.
  78  */
  79 #if defined(_MSC_VER)
  80 #  define finite _finite
  81 #endif
  82
  83
  84 /***
  85  *** IS_INF_OR_NAN: test if float is infinite or NaN
  86  ***/
  87 #if defined(isfinite)
  88 #define IS_INF_OR_NAN(x)        (!isfinite(x))
  89 #elif defined(finite)
  90 #define IS_INF_OR_NAN(x)        (!finite(x))
  91 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
  92 #define IS_INF_OR_NAN(x)        (!isfinite(x))
  93 #else
  94 #define IS_INF_OR_NAN(x)        (!finite(x))
  95 #endif
  96
  97
  98 /**
  99  * Convert float to int by rounding to nearest integer, away from zero.
 100  */
 101 static inline int IROUND(float f)
 102 {
 103    return (int) ((f >= 0.0F) ? (f + 0.5F) : (f - 0.5F));
 104 }
 105
 106 /**
 107  * Convert float to int64 by rounding to nearest integer.
 108  */
 109 static inline int64_t IROUND64(float f)
 110 {
 111    return (int64_t) ((f >= 0.0F) ? (f + 0.5F) : (f - 0.5F));
 112 }
 113
 114
 115 /**********************************************************************
 116  * Functions
 117  */
 118
 119 extern void *
 120 _mesa_align_malloc( size_t bytes, unsigned long alignment );
 121
 122 extern void *
 123 _mesa_align_calloc( size_t bytes, unsigned long alignment );
 124
 125 extern void
 126 _mesa_align_free( void *ptr );
 127
 128 extern void *
 129 _mesa_align_realloc(void *oldBuffer, size_t oldSize, size_t newSize,
 130                     unsigned long alignment);
 131
 132 extern int
 133 _mesa_snprintf( char *str, size_t size, const char *fmt, ... ) PRINTFLIKE(3, 4);
 134
 135 extern int
 136 _mesa_vsnprintf(char *str, size_t size, const char *fmt, va_list arg);
 137
 138
 139 #if defined(_WIN32) && !defined(HAVE_STRTOK_R)
 140 #define strtok_r strtok_s
 141 #endif
 142
 143 #ifdef __cplusplus
 144 }
 145 #endif
 146
 147
 148 #endif /* IMPORTS_H */