src/mesa/main/mesa_private.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  * \file mesa_private.h
  27  * Contains mesa internal values
  28  *
  29  */
  30
  31 #ifndef MESA_PRIVATE_H
  32 #define MESA_PRIVATE_H
  33
  34 #include "glheader.h"
  35
  36 #ifdef __cplusplus
  37 extern "C" {
  38 #endif
  39
  40
  41 /**
  42  * Sometimes we treat floats as ints.  On x86 systems, moving a float
  43  * as an int (thereby using integer registers instead of FP registers) is
  44  * a performance win.  Typically, this can be done with ordinary casts.
  45  * But with gcc's -fstrict-aliasing flag (which defaults to on in gcc 3.0)
  46  * these casts generate warnings.
  47  * The following union typedef is used to solve that.
  48  */
  49 typedef union { float f; int i; unsigned u; } fi_type;
  50
  51
  52 #ifdef __cplusplus
  53 }
  54 #endif
  55
  56 #endif /* MESA_PRIVATE_H */