1 /**************************************************************************
2 *
3 * Copyright 2007 VMware, Inc.
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 VMWARE 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 <[email protected]>
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
39 void
draw_pt_split_prim(enum mesa_prim prim,unsigned * first,unsigned * incr)40 draw_pt_split_prim(enum mesa_prim prim, unsigned *first, unsigned *incr)
41 {
42 switch (prim) {
43 case MESA_PRIM_POINTS:
44 *first = 1;
45 *incr = 1;
46 break;
47 case MESA_PRIM_LINES:
48 *first = 2;
49 *incr = 2;
50 break;
51 case MESA_PRIM_LINE_STRIP:
52 case MESA_PRIM_LINE_LOOP:
53 *first = 2;
54 *incr = 1;
55 break;
56 case MESA_PRIM_LINES_ADJACENCY:
57 *first = 4;
58 *incr = 4;
59 break;
60 case MESA_PRIM_LINE_STRIP_ADJACENCY:
61 *first = 4;
62 *incr = 1;
63 break;
64 case MESA_PRIM_TRIANGLES:
65 *first = 3;
66 *incr = 3;
67 break;
68 case MESA_PRIM_TRIANGLES_ADJACENCY:
69 *first = 6;
70 *incr = 6;
71 break;
72 case MESA_PRIM_TRIANGLE_STRIP:
73 case MESA_PRIM_TRIANGLE_FAN:
74 case MESA_PRIM_POLYGON:
75 *first = 3;
76 *incr = 1;
77 break;
78 case MESA_PRIM_TRIANGLE_STRIP_ADJACENCY:
79 *first = 6;
80 *incr = 2;
81 break;
82 case MESA_PRIM_QUADS:
83 *first = 4;
84 *incr = 4;
85 break;
86 case MESA_PRIM_QUAD_STRIP:
87 *first = 4;
88 *incr = 2;
89 break;
90 default:
91 assert(0);
92 *first = 0;
93 *incr = 1; /* set to one so that count % incr works */
94 break;
95 }
96 }
97
98
99 unsigned
draw_pt_trim_count(unsigned count,unsigned first,unsigned incr)100 draw_pt_trim_count(unsigned count, unsigned first, unsigned incr)
101 {
102 if (count < first)
103 return 0;
104 return count - (count - first) % incr;
105 }
106