1 /**************************************************************************
3 * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
33 #include "pipe/p_defines.h"
34 #include "util/u_debug.h"
40 struct u_prim_vertex_count
{
46 * Decompose a primitive that is a loop, a strip, or a fan. Return the
47 * original primitive if it is already decomposed.
49 static INLINE
unsigned
50 u_decomposed_prim(unsigned prim
)
53 case PIPE_PRIM_LINE_LOOP
:
54 case PIPE_PRIM_LINE_STRIP
:
55 return PIPE_PRIM_LINES
;
56 case PIPE_PRIM_TRIANGLE_STRIP
:
57 case PIPE_PRIM_TRIANGLE_FAN
:
58 return PIPE_PRIM_TRIANGLES
;
59 case PIPE_PRIM_QUAD_STRIP
:
60 return PIPE_PRIM_QUADS
;
61 case PIPE_PRIM_LINE_STRIP_ADJACENCY
:
62 return PIPE_PRIM_LINES_ADJACENCY
;
63 case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY
:
64 return PIPE_PRIM_TRIANGLES_ADJACENCY
;
71 * Reduce a primitive to one of PIPE_PRIM_POINTS, PIPE_PRIM_LINES, and
72 * PIPE_PRIM_TRIANGLES.
74 static INLINE
unsigned
75 u_reduced_prim(unsigned prim
)
78 case PIPE_PRIM_POINTS
:
79 return PIPE_PRIM_POINTS
;
81 case PIPE_PRIM_LINE_LOOP
:
82 case PIPE_PRIM_LINE_STRIP
:
83 case PIPE_PRIM_LINES_ADJACENCY
:
84 case PIPE_PRIM_LINE_STRIP_ADJACENCY
:
85 return PIPE_PRIM_LINES
;
87 return PIPE_PRIM_TRIANGLES
;
92 * Re-assemble a primitive to remove its adjacency.
94 static INLINE
unsigned
95 u_assembled_prim(unsigned prim
)
98 case PIPE_PRIM_LINES_ADJACENCY
:
99 case PIPE_PRIM_LINE_STRIP_ADJACENCY
:
100 return PIPE_PRIM_LINES
;
101 case PIPE_PRIM_TRIANGLES_ADJACENCY
:
102 case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY
:
103 return PIPE_PRIM_TRIANGLES
;
110 * Return the vertex count information for a primitive.
112 * Note that if this function is called directly or indirectly anywhere in a
113 * source file, it will increase the size of the binary slightly more than
114 * expected because of the use of a table.
116 static INLINE
const struct u_prim_vertex_count
*
117 u_prim_vertex_count(unsigned prim
)
119 static const struct u_prim_vertex_count prim_table
[PIPE_PRIM_MAX
] = {
120 { 1, 1 }, /* PIPE_PRIM_POINTS */
121 { 2, 2 }, /* PIPE_PRIM_LINES */
122 { 2, 1 }, /* PIPE_PRIM_LINE_LOOP */
123 { 2, 1 }, /* PIPE_PRIM_LINE_STRIP */
124 { 3, 3 }, /* PIPE_PRIM_TRIANGLES */
125 { 3, 1 }, /* PIPE_PRIM_TRIANGLE_STRIP */
126 { 3, 1 }, /* PIPE_PRIM_TRIANGLE_FAN */
127 { 4, 4 }, /* PIPE_PRIM_QUADS */
128 { 4, 2 }, /* PIPE_PRIM_QUAD_STRIP */
129 { 3, 1 }, /* PIPE_PRIM_POLYGON */
130 { 4, 4 }, /* PIPE_PRIM_LINES_ADJACENCY */
131 { 4, 1 }, /* PIPE_PRIM_LINE_STRIP_ADJACENCY */
132 { 6, 6 }, /* PIPE_PRIM_TRIANGLES_ADJACENCY */
133 { 6, 2 }, /* PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY */
136 return (likely(prim
< PIPE_PRIM_MAX
)) ? &prim_table
[prim
] : NULL
;
139 static INLINE boolean
u_validate_pipe_prim( unsigned pipe_prim
, unsigned nr
)
144 case PIPE_PRIM_POINTS
:
147 case PIPE_PRIM_LINES
:
150 case PIPE_PRIM_LINE_STRIP
:
151 case PIPE_PRIM_LINE_LOOP
:
154 case PIPE_PRIM_TRIANGLES
:
157 case PIPE_PRIM_TRIANGLE_STRIP
:
158 case PIPE_PRIM_TRIANGLE_FAN
:
159 case PIPE_PRIM_POLYGON
:
162 case PIPE_PRIM_QUADS
:
165 case PIPE_PRIM_QUAD_STRIP
:
177 static INLINE boolean
u_trim_pipe_prim( unsigned pipe_prim
, unsigned *nr
)
179 const struct u_prim_vertex_count
*count
= u_prim_vertex_count(pipe_prim
);
181 if (count
&& *nr
>= count
->min
) {
183 *nr
-= (*nr
% count
->incr
);
192 static INLINE
unsigned
193 u_vertices_per_prim(int primitive
)
196 case PIPE_PRIM_POINTS
:
198 case PIPE_PRIM_LINES
:
199 case PIPE_PRIM_LINE_LOOP
:
200 case PIPE_PRIM_LINE_STRIP
:
202 case PIPE_PRIM_TRIANGLES
:
203 case PIPE_PRIM_TRIANGLE_STRIP
:
204 case PIPE_PRIM_TRIANGLE_FAN
:
206 case PIPE_PRIM_LINES_ADJACENCY
:
207 case PIPE_PRIM_LINE_STRIP_ADJACENCY
:
209 case PIPE_PRIM_TRIANGLES_ADJACENCY
:
210 case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY
:
213 /* following primitives should never be used
214 * with geometry shaders abd their size is
216 case PIPE_PRIM_POLYGON
:
217 case PIPE_PRIM_QUADS
:
218 case PIPE_PRIM_QUAD_STRIP
:
220 debug_printf("Unrecognized geometry shader primitive");
226 * Returns the number of decomposed primitives for the given
228 * Parts of the pipline are invoked once for each triangle in
229 * triangle strip, triangle fans and triangles and once
230 * for each line in line strip, line loop, lines. Also
231 * statistics depend on knowing the exact number of decomposed
232 * primitives for a set of vertices.
234 static INLINE
unsigned
235 u_decomposed_prims_for_vertices(int primitive
, int vertices
)
238 case PIPE_PRIM_POINTS
:
240 case PIPE_PRIM_LINES
:
242 case PIPE_PRIM_LINE_LOOP
:
244 case PIPE_PRIM_LINE_STRIP
:
245 return (vertices
> 1) ? vertices
- 1 : 0;
246 case PIPE_PRIM_TRIANGLES
:
248 case PIPE_PRIM_TRIANGLE_STRIP
:
249 return (vertices
> 2) ? vertices
- 2 : 0;
250 case PIPE_PRIM_TRIANGLE_FAN
:
251 return (vertices
> 2) ? vertices
- 2 : 0;
252 case PIPE_PRIM_LINES_ADJACENCY
:
254 case PIPE_PRIM_LINE_STRIP_ADJACENCY
:
255 return (vertices
> 3) ? vertices
- 3 : 0;
256 case PIPE_PRIM_TRIANGLES_ADJACENCY
:
258 case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY
:
259 return (vertices
> 5) ? 1 + (vertices
- 6)/2 : 0;
260 case PIPE_PRIM_QUADS
:
262 case PIPE_PRIM_QUAD_STRIP
:
263 return (vertices
> 4) ? (vertices
- 2) / 2 : 0;
264 /* Polygons can't be decomposed
265 * because the number of their vertices isn't known so
266 * for them and whatever else we don't recognize just
267 * return 1 if the number of vertices is greater than
268 * 3 and zero otherwise */
269 case PIPE_PRIM_POLYGON
:
271 debug_printf("Invalid decomposition primitive!\n");
272 return (vertices
> 3) ? 1 : 0;
276 static INLINE
unsigned
277 u_assembled_primitive(unsigned prim
)
279 return u_assembled_prim(prim
);
284 const char *u_prim_name( unsigned pipe_prim
);