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  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/draw_context.h"
  34. #include "draw/draw_private.h"
  35. #include "draw/draw_pt.h"
  36. #include "util/u_debug.h"
  37.  
  38. void draw_pt_split_prim(unsigned prim, unsigned *first, unsigned *incr)
  39. {
  40.    switch (prim) {
  41.    case PIPE_PRIM_POINTS:
  42.       *first = 1;
  43.       *incr = 1;
  44.       break;
  45.    case PIPE_PRIM_LINES:
  46.       *first = 2;
  47.       *incr = 2;
  48.       break;
  49.    case PIPE_PRIM_LINE_STRIP:
  50.    case PIPE_PRIM_LINE_LOOP:
  51.       *first = 2;
  52.       *incr = 1;
  53.       break;
  54.    case PIPE_PRIM_LINES_ADJACENCY:
  55.       *first = 4;
  56.       *incr = 4;
  57.       break;
  58.    case PIPE_PRIM_LINE_STRIP_ADJACENCY:
  59.       *first = 4;
  60.       *incr = 1;
  61.       break;
  62.    case PIPE_PRIM_TRIANGLES:
  63.       *first = 3;
  64.       *incr = 3;
  65.       break;
  66.    case PIPE_PRIM_TRIANGLES_ADJACENCY:
  67.       *first = 6;
  68.       *incr = 6;
  69.       break;
  70.    case PIPE_PRIM_TRIANGLE_STRIP:
  71.    case PIPE_PRIM_TRIANGLE_FAN:
  72.    case PIPE_PRIM_POLYGON:
  73.       *first = 3;
  74.       *incr = 1;
  75.       break;
  76.    case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
  77.       *first = 6;
  78.       *incr = 2;
  79.       break;
  80.    case PIPE_PRIM_QUADS:
  81.       *first = 4;
  82.       *incr = 4;
  83.       break;
  84.    case PIPE_PRIM_QUAD_STRIP:
  85.       *first = 4;
  86.       *incr = 2;
  87.       break;
  88.    default:
  89.       assert(0);
  90.       *first = 0;
  91.       *incr = 1;                /* set to one so that count % incr works */
  92.       break;
  93.    }
  94. }
  95.  
  96. unsigned draw_pt_trim_count(unsigned count, unsigned first, unsigned incr)
  97. {
  98.    if (count < first)
  99.       return 0;
  100.    return count - (count - first) % incr;
  101. }
  102.