src/gallium/aux/draw/draw_debug.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   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
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28  /*
  29   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   */
  32
  33 #include "draw_private.h"
  34 #include "draw_context.h"
  35
  36
  37
  38 static void
  39 draw_prim_info(unsigned prim, unsigned *first, unsigned *incr)
  40 {
  41    assert(prim >= PIPE_PRIM_POINTS);
  42    assert(prim <= PIPE_PRIM_POLYGON);
  43
  44    switch (prim) {
  45    case PIPE_PRIM_POINTS:
  46       *first = 1;
  47       *incr = 1;
  48       break;
  49    case PIPE_PRIM_LINES:
  50       *first = 2;
  51       *incr = 2;
  52       break;
  53    case PIPE_PRIM_LINE_STRIP:
  54       *first = 2;
  55       *incr = 1;
  56       break;
  57    case PIPE_PRIM_LINE_LOOP:
  58       *first = 2;
  59       *incr = 1;
  60       break;
  61    case PIPE_PRIM_TRIANGLES:
  62       *first = 3;
  63       *incr = 3;
  64       break;
  65    case PIPE_PRIM_TRIANGLE_STRIP:
  66       *first = 3;
  67       *incr = 1;
  68       break;
  69    case PIPE_PRIM_TRIANGLE_FAN:
  70    case PIPE_PRIM_POLYGON:
  71       *first = 3;
  72       *incr = 1;
  73       break;
  74    case PIPE_PRIM_QUADS:
  75       *first = 4;
  76       *incr = 4;
  77       break;
  78    case PIPE_PRIM_QUAD_STRIP:
  79       *first = 4;
  80       *incr = 2;
  81       break;
  82    default:
  83       assert(0);
  84       *first = 1;
  85       *incr = 1;
  86       break;
  87    }
  88 }
  89
  90
  91 unsigned
  92 draw_trim_prim( unsigned mode, unsigned count )
  93 {
  94    unsigned length, first, incr;
  95
  96    draw_prim_info( mode, &first, &incr );
  97
  98    if (count < first)
  99       length = 0;
 100    else
 101       length = count - (count - first) % incr;
 102
 103    return length;
 104 }
 105
 106
 107 boolean
 108 draw_validate_prim( unsigned mode, unsigned count )
 109 {
 110    return (count > 0 &&
 111            count == draw_trim_prim( mode, count ));
 112 }
 113