src/mesa/drivers/dri/common/spantmp_common.h

   1 /*
   2  * Copyright 2000-2001 VA Linux Systems, Inc.
   3  * (C) Copyright IBM Corporation 2004
   4  * 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  * on the rights to use, copy, modify, merge, publish, distribute, sub
  10  * license, and/or sell copies of the Software, and to permit persons to whom
  11  * the Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  20  * VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  21  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  22  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  23  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 /**
  27  * \file spantmp_common.h
  28  *
  29  * common macros for span read / write functions to be used in the depth,
  30  * stencil and pixel span templates.
  31  */
  32
  33 #ifndef HW_WRITE_LOCK
  34 #define HW_WRITE_LOCK()         HW_LOCK()
  35 #endif
  36
  37 #ifndef HW_WRITE_UNLOCK
  38 #define HW_WRITE_UNLOCK()       HW_UNLOCK()
  39 #endif
  40
  41 #ifndef HW_READ_LOCK
  42 #define HW_READ_LOCK()          HW_LOCK()
  43 #endif
  44
  45 #ifndef HW_READ_UNLOCK
  46 #define HW_READ_UNLOCK()        HW_UNLOCK()
  47 #endif
  48
  49 #ifndef HW_CLIPLOOP
  50 #define HW_CLIPLOOP()                                                   \
  51    do {                                                                 \
  52       int minx = 0;                                                     \
  53       int miny = 0;                                                     \
  54       int maxx = dPriv->w;                                              \
  55       int maxy = dPriv->h;
  56 #endif
  57
  58 #ifndef HW_ENDCLIPLOOP
  59 #define HW_ENDCLIPLOOP()                                                \
  60    } while (0)
  61 #endif
  62
  63 #ifndef CLIPPIXEL
  64 #define CLIPPIXEL( _x, _y )                                             \
  65    ((_x >= minx) && (_x < maxx) && (_y >= miny) && (_y < maxy))
  66 #endif
  67
  68 #ifndef CLIPSPAN
  69 #define CLIPSPAN( _x, _y, _n, _x1, _n1, _i )                            \
  70    if ( _y < miny || _y >= maxy /*|| _x + n < minx || _x >=maxx*/ ) {   \
  71       _n1 = 0, _x1 = x;                                                 \
  72    } else {                                                             \
  73       _n1 = _n;                                                         \
  74       _x1 = _x;                                                         \
  75       if ( _x1 < minx ) _i += (minx-_x1), n1 -= (minx-_x1), _x1 = minx; \
  76       if ( _x1 + _n1 >= maxx ) n1 -= (_x1 + n1 - maxx);                 \
  77    }
  78 #endif