1 /*
2 * Copyright 2009 VMware, Inc.
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * on the rights to use, copy, modify, merge, publish, distribute, sub
9 * license, and/or sell copies of the Software, and to permit persons to whom
10 * the Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
19 * VMWARE AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
22 * USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 #include "u_indices.h"
26 #include "u_indices_priv.h"
27
translate_memcpy_ushort(const void * in,unsigned start,unsigned in_nr,unsigned out_nr,unsigned restart_index,void * out)28 static void translate_memcpy_ushort( const void *in,
29 unsigned start,
30 unsigned in_nr,
31 unsigned out_nr,
32 unsigned restart_index,
33 void *out )
34 {
35 memcpy(out, &((short *)in)[start], out_nr*sizeof(short));
36 }
37
translate_memcpy_uint(const void * in,unsigned start,unsigned in_nr,unsigned out_nr,unsigned restart_index,void * out)38 static void translate_memcpy_uint( const void *in,
39 unsigned start,
40 unsigned in_nr,
41 unsigned out_nr,
42 unsigned restart_index,
43 void *out )
44 {
45 memcpy(out, &((int *)in)[start], out_nr*sizeof(int));
46 }
47
translate_byte_to_ushort(const void * in,unsigned start,UNUSED unsigned in_nr,unsigned out_nr,UNUSED unsigned restart_index,void * out)48 static void translate_byte_to_ushort( const void *in,
49 unsigned start,
50 UNUSED unsigned in_nr,
51 unsigned out_nr,
52 UNUSED unsigned restart_index,
53 void *out )
54 {
55 uint8_t *src = (uint8_t *)in + start;
56 uint16_t *dst = out;
57 while (out_nr--) {
58 *dst++ = *src++;
59 }
60 }
61
62 enum pipe_prim_type
u_index_prim_type_convert(unsigned hw_mask,enum pipe_prim_type prim,bool pv_matches)63 u_index_prim_type_convert(unsigned hw_mask, enum pipe_prim_type prim, bool pv_matches)
64 {
65 if ((hw_mask & (1<<prim)) && pv_matches)
66 return prim;
67
68 switch (prim) {
69 case PIPE_PRIM_POINTS:
70 return PIPE_PRIM_POINTS;
71 case PIPE_PRIM_LINES:
72 case PIPE_PRIM_LINE_STRIP:
73 case PIPE_PRIM_LINE_LOOP:
74 return PIPE_PRIM_LINES;
75 case PIPE_PRIM_TRIANGLES:
76 case PIPE_PRIM_TRIANGLE_STRIP:
77 case PIPE_PRIM_TRIANGLE_FAN:
78 case PIPE_PRIM_QUADS:
79 case PIPE_PRIM_QUAD_STRIP:
80 case PIPE_PRIM_POLYGON:
81 return PIPE_PRIM_TRIANGLES;
82 case PIPE_PRIM_LINES_ADJACENCY:
83 case PIPE_PRIM_LINE_STRIP_ADJACENCY:
84 return PIPE_PRIM_LINES_ADJACENCY;
85 case PIPE_PRIM_TRIANGLES_ADJACENCY:
86 case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
87 return PIPE_PRIM_TRIANGLES_ADJACENCY;
88 case PIPE_PRIM_PATCHES:
89 return PIPE_PRIM_PATCHES;
90 default:
91 assert(0);
92 break;
93 }
94 return PIPE_PRIM_POINTS;
95 }
96
97 /**
98 * Translate indexes when a driver can't support certain types
99 * of drawing. Example include:
100 * - Translate 1-byte indexes into 2-byte indexes
101 * - Translate PIPE_PRIM_QUADS into PIPE_PRIM_TRIANGLES when the hardware
102 * doesn't support the former.
103 * - Translate from first provoking vertex to last provoking vertex and
104 * vice versa.
105 *
106 * Note that this function is used for indexed primitives.
107 *
108 * \param hw_mask mask of (1 << PIPE_PRIM_x) flags indicating which types
109 * of primitives are supported by the hardware.
110 * \param prim incoming PIPE_PRIM_x
111 * \param in_index_size bytes per index value (1, 2 or 4)
112 * \param nr number of incoming vertices
113 * \param in_pv incoming provoking vertex convention (PV_FIRST or PV_LAST)
114 * \param out_pv desired provoking vertex convention (PV_FIRST or PV_LAST)
115 * \param prim_restart whether primitive restart is disable or enabled
116 * \param out_prim returns new PIPE_PRIM_x we'll translate to
117 * \param out_index_size returns bytes per new index value (2 or 4)
118 * \param out_nr returns number of new vertices
119 * \param out_translate returns the translation function to use by the caller
120 */
121 enum indices_mode
u_index_translator(unsigned hw_mask,enum pipe_prim_type prim,unsigned in_index_size,unsigned nr,unsigned in_pv,unsigned out_pv,unsigned prim_restart,enum pipe_prim_type * out_prim,unsigned * out_index_size,unsigned * out_nr,u_translate_func * out_translate)122 u_index_translator(unsigned hw_mask,
123 enum pipe_prim_type prim,
124 unsigned in_index_size,
125 unsigned nr,
126 unsigned in_pv,
127 unsigned out_pv,
128 unsigned prim_restart,
129 enum pipe_prim_type *out_prim,
130 unsigned *out_index_size,
131 unsigned *out_nr,
132 u_translate_func *out_translate)
133 {
134 unsigned in_idx;
135 unsigned out_idx;
136 enum indices_mode ret = U_TRANSLATE_NORMAL;
137
138 assert(in_index_size == 1 ||
139 in_index_size == 2 ||
140 in_index_size == 4);
141
142 u_index_init();
143
144 in_idx = in_size_idx(in_index_size);
145 *out_index_size = u_index_size_convert(in_index_size);
146 out_idx = out_size_idx(*out_index_size);
147
148 if ((hw_mask & (1<<prim)) &&
149 in_pv == out_pv)
150 {
151 if (in_index_size == 4)
152 *out_translate = translate_memcpy_uint;
153 else if (in_index_size == 2)
154 *out_translate = translate_memcpy_ushort;
155 else
156 *out_translate = translate_byte_to_ushort;
157
158 *out_prim = prim;
159 *out_nr = nr;
160
161 return U_TRANSLATE_MEMCPY;
162 }
163 *out_translate = translate[in_idx][out_idx][in_pv][out_pv][prim_restart][prim];
164 *out_prim = u_index_prim_type_convert(hw_mask, prim, in_pv == out_pv);
165 *out_nr = u_index_count_converted_indices(hw_mask, in_pv == out_pv, prim, nr);
166
167 return ret;
168 }
169
170 unsigned
u_index_count_converted_indices(unsigned hw_mask,bool pv_matches,enum pipe_prim_type prim,unsigned nr)171 u_index_count_converted_indices(unsigned hw_mask, bool pv_matches, enum pipe_prim_type prim, unsigned nr)
172 {
173 if ((hw_mask & (1<<prim)) && pv_matches)
174 return nr;
175
176 switch (prim) {
177 case PIPE_PRIM_POINTS:
178 case PIPE_PRIM_PATCHES:
179 return nr;
180 case PIPE_PRIM_LINES:
181 return nr;
182 case PIPE_PRIM_LINE_STRIP:
183 return (nr - 1) * 2;
184 case PIPE_PRIM_LINE_LOOP:
185 return nr * 2;
186 case PIPE_PRIM_TRIANGLES:
187 return nr;
188 case PIPE_PRIM_TRIANGLE_STRIP:
189 return (nr - 2) * 3;
190 case PIPE_PRIM_TRIANGLE_FAN:
191 return (nr - 2) * 3;
192 case PIPE_PRIM_QUADS:
193 return (nr / 4) * 6;
194 case PIPE_PRIM_QUAD_STRIP:
195 return (nr - 2) * 3;
196 case PIPE_PRIM_POLYGON:
197 return (nr - 2) * 3;
198 case PIPE_PRIM_LINES_ADJACENCY:
199 return nr;
200 case PIPE_PRIM_LINE_STRIP_ADJACENCY:
201 return (nr - 3) * 4;
202 case PIPE_PRIM_TRIANGLES_ADJACENCY:
203 return nr;
204 case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
205 return ((nr - 4) / 2) * 6;
206 default:
207 assert(0);
208 break;
209 }
210 return nr;
211 }
212
213
214 /**
215 * If a driver does not support a particular gallium primitive type
216 * (such as PIPE_PRIM_QUAD_STRIP) this function can be used to help
217 * convert the primitive into a simpler type (like PIPE_PRIM_TRIANGLES).
218 *
219 * The generator functions generates a number of ushort or uint indexes
220 * for drawing the new type of primitive.
221 *
222 * Note that this function is used for non-indexed primitives.
223 *
224 * \param hw_mask a bitmask of (1 << PIPE_PRIM_x) values that indicates
225 * kind of primitives are supported by the driver.
226 * \param prim the PIPE_PRIM_x that the user wants to draw
227 * \param start index of first vertex to draw
228 * \param nr number of vertices to draw
229 * \param in_pv user's provoking vertex (PV_FIRST/LAST)
230 * \param out_pv desired proking vertex for the hardware (PV_FIRST/LAST)
231 * \param out_prim returns the new primitive type for the driver
232 * \param out_index_size returns OUT_USHORT or OUT_UINT
233 * \param out_nr returns new number of vertices to draw
234 * \param out_generate returns pointer to the generator function
235 */
236 enum indices_mode
u_index_generator(unsigned hw_mask,enum pipe_prim_type prim,unsigned start,unsigned nr,unsigned in_pv,unsigned out_pv,enum pipe_prim_type * out_prim,unsigned * out_index_size,unsigned * out_nr,u_generate_func * out_generate)237 u_index_generator(unsigned hw_mask,
238 enum pipe_prim_type prim,
239 unsigned start,
240 unsigned nr,
241 unsigned in_pv,
242 unsigned out_pv,
243 enum pipe_prim_type *out_prim,
244 unsigned *out_index_size,
245 unsigned *out_nr,
246 u_generate_func *out_generate)
247 {
248 unsigned out_idx;
249
250 u_index_init();
251
252 *out_index_size = ((start + nr) > 0xfffe) ? 4 : 2;
253 out_idx = out_size_idx(*out_index_size);
254 *out_prim = u_index_prim_type_convert(hw_mask, prim, in_pv == out_pv);
255 *out_nr = u_index_count_converted_indices(hw_mask, in_pv == out_pv, prim, nr);
256
257 if ((hw_mask & (1<<prim)) &&
258 (in_pv == out_pv)) {
259
260 *out_generate = generate[out_idx][in_pv][out_pv][PIPE_PRIM_POINTS];
261 return U_GENERATE_LINEAR;
262 }
263 *out_generate = generate[out_idx][in_pv][out_pv][prim];
264 return prim == PIPE_PRIM_LINE_LOOP ? U_GENERATE_ONE_OFF : U_GENERATE_REUSABLE;
265 }
266