u_prim.h revision 4a49301e 
1/**************************************************************************
2 *
3 * Copyright 2008 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#ifndef U_BLIT_H
30#define U_BLIT_H
31
32
33#ifdef __cplusplus
34extern "C" {
35#endif
36
37#include "pipe/p_defines.h"
38
39static INLINE boolean u_validate_pipe_prim( unsigned pipe_prim, unsigned nr )
40{
41   boolean ok = TRUE;
42
43   switch (pipe_prim) {
44   case PIPE_PRIM_POINTS:
45      ok = (nr >= 1);
46      break;
47   case PIPE_PRIM_LINES:
48      ok = (nr >= 2);
49      break;
50   case PIPE_PRIM_LINE_STRIP:
51   case PIPE_PRIM_LINE_LOOP:
52      ok = (nr >= 2);
53      break;
54   case PIPE_PRIM_TRIANGLES:
55      ok = (nr >= 3);
56      break;
57   case PIPE_PRIM_TRIANGLE_STRIP:
58   case PIPE_PRIM_TRIANGLE_FAN:
59   case PIPE_PRIM_POLYGON:
60      ok = (nr >= 3);
61      break;
62   case PIPE_PRIM_QUADS:
63      ok = (nr >= 4);
64      break;
65   case PIPE_PRIM_QUAD_STRIP:
66      ok = (nr >= 4);
67      break;
68   default:
69      ok = 0;
70      break;
71   }
72
73   return ok;
74}
75
76
77static INLINE boolean u_trim_pipe_prim( unsigned pipe_prim, unsigned *nr )
78{
79   boolean ok = TRUE;
80
81   switch (pipe_prim) {
82   case PIPE_PRIM_POINTS:
83      ok = (*nr >= 1);
84      break;
85   case PIPE_PRIM_LINES:
86      ok = (*nr >= 2);
87      *nr -= (*nr % 2);
88      break;
89   case PIPE_PRIM_LINE_STRIP:
90   case PIPE_PRIM_LINE_LOOP:
91      ok = (*nr >= 2);
92      break;
93   case PIPE_PRIM_TRIANGLES:
94      ok = (*nr >= 3);
95      *nr -= (*nr % 3);
96      break;
97   case PIPE_PRIM_TRIANGLE_STRIP:
98   case PIPE_PRIM_TRIANGLE_FAN:
99   case PIPE_PRIM_POLYGON:
100      ok = (*nr >= 3);
101      break;
102   case PIPE_PRIM_QUADS:
103      ok = (*nr >= 4);
104      *nr -= (*nr % 4);
105      break;
106   case PIPE_PRIM_QUAD_STRIP:
107      ok = (*nr >= 4);
108      *nr -= (*nr % 2);
109      break;
110   default:
111      ok = 0;
112      break;
113   }
114
115   if (!ok)
116      *nr = 0;
117
118   return ok;
119}
120
121
122static INLINE unsigned u_reduced_prim( unsigned pipe_prim )
123{
124   switch (pipe_prim) {
125   case PIPE_PRIM_POINTS:
126      return PIPE_PRIM_POINTS;
127
128   case PIPE_PRIM_LINES:
129   case PIPE_PRIM_LINE_STRIP:
130   case PIPE_PRIM_LINE_LOOP:
131      return PIPE_PRIM_LINES;
132
133   default:
134      return PIPE_PRIM_TRIANGLES;
135   }
136}
137
138#endif
139