u_prim.h revision cdc920a0 
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#include "pipe/p_defines.h"
34#include "util/u_debug.h"
35
36#ifdef __cplusplus
37extern "C" {
38#endif
39
40static INLINE boolean u_validate_pipe_prim( unsigned pipe_prim, unsigned nr )
41{
42   boolean ok = TRUE;
43
44   switch (pipe_prim) {
45   case PIPE_PRIM_POINTS:
46      ok = (nr >= 1);
47      break;
48   case PIPE_PRIM_LINES:
49      ok = (nr >= 2);
50      break;
51   case PIPE_PRIM_LINE_STRIP:
52   case PIPE_PRIM_LINE_LOOP:
53      ok = (nr >= 2);
54      break;
55   case PIPE_PRIM_TRIANGLES:
56      ok = (nr >= 3);
57      break;
58   case PIPE_PRIM_TRIANGLE_STRIP:
59   case PIPE_PRIM_TRIANGLE_FAN:
60   case PIPE_PRIM_POLYGON:
61      ok = (nr >= 3);
62      break;
63   case PIPE_PRIM_QUADS:
64      ok = (nr >= 4);
65      break;
66   case PIPE_PRIM_QUAD_STRIP:
67      ok = (nr >= 4);
68      break;
69   default:
70      ok = 0;
71      break;
72   }
73
74   return ok;
75}
76
77
78static INLINE boolean u_trim_pipe_prim( unsigned pipe_prim, unsigned *nr )
79{
80   boolean ok = TRUE;
81
82   switch (pipe_prim) {
83   case PIPE_PRIM_POINTS:
84      ok = (*nr >= 1);
85      break;
86   case PIPE_PRIM_LINES:
87      ok = (*nr >= 2);
88      *nr -= (*nr % 2);
89      break;
90   case PIPE_PRIM_LINE_STRIP:
91   case PIPE_PRIM_LINE_LOOP:
92      ok = (*nr >= 2);
93      break;
94   case PIPE_PRIM_TRIANGLES:
95      ok = (*nr >= 3);
96      *nr -= (*nr % 3);
97      break;
98   case PIPE_PRIM_TRIANGLE_STRIP:
99   case PIPE_PRIM_TRIANGLE_FAN:
100   case PIPE_PRIM_POLYGON:
101      ok = (*nr >= 3);
102      break;
103   case PIPE_PRIM_QUADS:
104      ok = (*nr >= 4);
105      *nr -= (*nr % 4);
106      break;
107   case PIPE_PRIM_QUAD_STRIP:
108      ok = (*nr >= 4);
109      *nr -= (*nr % 2);
110      break;
111   default:
112      ok = 0;
113      break;
114   }
115
116   if (!ok)
117      *nr = 0;
118
119   return ok;
120}
121
122
123static INLINE unsigned u_reduced_prim( unsigned pipe_prim )
124{
125   switch (pipe_prim) {
126   case PIPE_PRIM_POINTS:
127      return PIPE_PRIM_POINTS;
128
129   case PIPE_PRIM_LINES:
130   case PIPE_PRIM_LINE_STRIP:
131   case PIPE_PRIM_LINE_LOOP:
132      return PIPE_PRIM_LINES;
133
134   default:
135      return PIPE_PRIM_TRIANGLES;
136   }
137}
138
139static INLINE unsigned
140u_vertices_per_prim(int primitive)
141{
142   switch(primitive) {
143   case PIPE_PRIM_POINTS:
144      return 1;
145   case PIPE_PRIM_LINES:
146   case PIPE_PRIM_LINE_LOOP:
147   case PIPE_PRIM_LINE_STRIP:
148      return 2;
149   case PIPE_PRIM_TRIANGLES:
150   case PIPE_PRIM_TRIANGLE_STRIP:
151   case PIPE_PRIM_TRIANGLE_FAN:
152      return 3;
153   case PIPE_PRIM_LINES_ADJACENCY:
154   case PIPE_PRIM_LINE_STRIP_ADJACENCY:
155      return 4;
156   case PIPE_PRIM_TRIANGLES_ADJACENCY:
157   case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
158      return 6;
159
160   /* following primitives should never be used
161    * with geometry shaders abd their size is
162    * undefined */
163   case PIPE_PRIM_POLYGON:
164   case PIPE_PRIM_QUADS:
165   case PIPE_PRIM_QUAD_STRIP:
166   default:
167      debug_printf("Unrecognized geometry shader primitive");
168      return 3;
169   }
170}
171
172const char *u_prim_name( unsigned pipe_prim );
173
174#endif
175