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
draw_pt_split_prim(unsigned prim,unsigned * first,unsigned * incr)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
draw_pt_trim_count(unsigned count,unsigned first,unsigned incr)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