summaryrefslogtreecommitdiffstats
path: root/src/gallium/auxiliary/draw/draw_pt_vsplit.c
blob: 625505d1efd1d7b4301ff5e1ce7675fecdee28e5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
/*
 * Mesa 3-D graphics library
 *
 * Copyright 2007-2008 Tungsten Graphics, Inc., Cedar Park, Texas.
 * Copyright (C) 2010 LunarG Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "util/u_math.h"
#include "util/u_memory.h"

#include "draw/draw_context.h"
#include "draw/draw_private.h"
#include "draw/draw_pt.h"

#define SEGMENT_SIZE 1024
#define MAP_SIZE     256

/* The largest possible index withing an index buffer */
#define MAX_ELT_IDX 0xffffffff

struct vsplit_frontend {
   struct draw_pt_front_end base;
   struct draw_context *draw;

   unsigned prim;

   struct draw_pt_middle_end *middle;

   unsigned max_vertices;
   ushort segment_size;

   /* buffers for splitting */
   unsigned fetch_elts[SEGMENT_SIZE];
   ushort draw_elts[SEGMENT_SIZE];
   ushort identity_draw_elts[SEGMENT_SIZE];

   struct {
      /* map a fetch element to a draw element */
      unsigned fetches[MAP_SIZE];
      ushort draws[MAP_SIZE];
      boolean has_max_fetch;

      ushort num_fetch_elts;
      ushort num_draw_elts;
   } cache;
};


static void
vsplit_clear_cache(struct vsplit_frontend *vsplit)
{
   memset(vsplit->cache.fetches, 0xff, sizeof(vsplit->cache.fetches));
   vsplit->cache.has_max_fetch = FALSE;
   vsplit->cache.num_fetch_elts = 0;
   vsplit->cache.num_draw_elts = 0;
}

static void
vsplit_flush_cache(struct vsplit_frontend *vsplit, unsigned flags)
{
   vsplit->middle->run(vsplit->middle,
         vsplit->fetch_elts, vsplit->cache.num_fetch_elts,
         vsplit->draw_elts, vsplit->cache.num_draw_elts, flags);
}

/**
 * Add a fetch element and add it to the draw elements.
 */
static INLINE void
vsplit_add_cache(struct vsplit_frontend *vsplit, unsigned fetch, unsigned ofbias)
{
   unsigned hash;

   hash = fetch % MAP_SIZE;

   /* If the value isn't in the cache of it's an overflow due to the
    * element bias */
   if (vsplit->cache.fetches[hash] != fetch || ofbias) {
      /* update cache */
      vsplit->cache.fetches[hash] = fetch;
      vsplit->cache.draws[hash] = vsplit->cache.num_fetch_elts;

      /* add fetch */
      assert(vsplit->cache.num_fetch_elts < vsplit->segment_size);
      vsplit->fetch_elts[vsplit->cache.num_fetch_elts++] = fetch;
   }

   vsplit->draw_elts[vsplit->cache.num_draw_elts++] = vsplit->cache.draws[hash];
}

/**
 * Returns the base index to the elements array.
 * The value is checked for overflows (both integer overflows
 * and the elements array overflow).
 */
static INLINE unsigned
vsplit_get_base_idx(struct vsplit_frontend *vsplit,
                    unsigned start, unsigned fetch, unsigned *ofbit)
{
   struct draw_context *draw = vsplit->draw;
   unsigned elt_idx = draw_overflow_uadd(start, fetch, MAX_ELT_IDX);
   if (ofbit)
      *ofbit = 0;

   /* Overflown indices need to wrap to the first element
    * in the index buffer */
   if (elt_idx >= draw->pt.user.eltMax) {
      if (ofbit)
         *ofbit = 1;
      elt_idx = 0;
   }

   return elt_idx;
}

/**
 * Returns the element index adjust for the element bias.
 * The final element index is created from the actual element
 * index, plus the element bias, clamped to maximum elememt
 * index if that addition overflows.
 */
static INLINE unsigned
vsplit_get_bias_idx(struct vsplit_frontend *vsplit,
                    int idx, int bias, unsigned *ofbias)
{
   int res = idx + bias;

   if (ofbias)
      *ofbias = 0;

   if (idx > 0 && bias > 0) {
      if (res < idx || res < bias) {
         res = DRAW_MAX_FETCH_IDX;
         if (ofbias)
            *ofbias = 1;
      }
   } else if (idx < 0 && bias < 0) {
      if (res > idx || res > bias) {
         res = DRAW_MAX_FETCH_IDX;
         if (ofbias)
            *ofbias = 1;
      }
   }

   return res;
}

#define VSPLIT_CREATE_IDX(elts, start, fetch, elt_bias)    \
   unsigned elt_idx;                                       \
   unsigned ofbit;                                         \
   unsigned ofbias;                                        \
   elt_idx = vsplit_get_base_idx(vsplit, start, fetch, &ofbit);          \
   elt_idx = vsplit_get_bias_idx(vsplit, ofbit ? 0 : DRAW_GET_IDX(elts, elt_idx), elt_bias, &ofbias)

static INLINE void
vsplit_add_cache_ubyte(struct vsplit_frontend *vsplit, const ubyte *elts,
                       unsigned start, unsigned fetch, int elt_bias)
{
   struct draw_context *draw = vsplit->draw;
   VSPLIT_CREATE_IDX(elts, start, fetch, elt_bias);
   vsplit_add_cache(vsplit, elt_idx, ofbias);
}

static INLINE void
vsplit_add_cache_ushort(struct vsplit_frontend *vsplit, const ushort *elts,
                       unsigned start, unsigned fetch, int elt_bias)
{
   struct draw_context *draw = vsplit->draw;
   VSPLIT_CREATE_IDX(elts, start, fetch, elt_bias);
   vsplit_add_cache(vsplit, elt_idx, ofbias);
}


/**
 * Add a fetch element and add it to the draw elements.  The fetch element is
 * in full range (uint).
 */
static INLINE void
vsplit_add_cache_uint(struct vsplit_frontend *vsplit, const uint *elts,
                      unsigned start, unsigned fetch, int elt_bias)
{
   struct draw_context *draw = vsplit->draw;
   unsigned raw_elem_idx = start + fetch + elt_bias;
   VSPLIT_CREATE_IDX(elts, start, fetch, elt_bias);

   /* special care for DRAW_MAX_FETCH_IDX */
   if (raw_elem_idx == DRAW_MAX_FETCH_IDX && !vsplit->cache.has_max_fetch) {
      unsigned hash = fetch % MAP_SIZE;
      vsplit->cache.fetches[hash] = raw_elem_idx - 1; /* force update */
      vsplit->cache.has_max_fetch = TRUE;
   }

   vsplit_add_cache(vsplit, elt_idx, ofbias);
}


#define FUNC vsplit_run_linear
#include "draw_pt_vsplit_tmp.h"

#define FUNC vsplit_run_ubyte
#define ELT_TYPE ubyte
#define ADD_CACHE(vsplit, ib, start, fetch, bias) vsplit_add_cache_ubyte(vsplit,ib,start,fetch,bias)
#include "draw_pt_vsplit_tmp.h"

#define FUNC vsplit_run_ushort
#define ELT_TYPE ushort
#define ADD_CACHE(vsplit, ib, start, fetch, bias) vsplit_add_cache_ushort(vsplit,ib,start,fetch, bias)
#include "draw_pt_vsplit_tmp.h"

#define FUNC vsplit_run_uint
#define ELT_TYPE uint
#define ADD_CACHE(vsplit, ib, start, fetch, bias) vsplit_add_cache_uint(vsplit, ib, start, fetch, bias)
#include "draw_pt_vsplit_tmp.h"


static void vsplit_prepare(struct draw_pt_front_end *frontend,
                           unsigned in_prim,
                           struct draw_pt_middle_end *middle,
                           unsigned opt)
{
   struct vsplit_frontend *vsplit = (struct vsplit_frontend *) frontend;

   switch (vsplit->draw->pt.user.eltSize) {
   case 0:
      vsplit->base.run = vsplit_run_linear;
      break;
   case 1:
      vsplit->base.run = vsplit_run_ubyte;
      break;
   case 2:
      vsplit->base.run = vsplit_run_ushort;
      break;
   case 4:
      vsplit->base.run = vsplit_run_uint;
      break;
   default:
      assert(0);
      break;
   }

   /* split only */
   vsplit->prim = in_prim;

   vsplit->middle = middle;
   middle->prepare(middle, vsplit->prim, opt, &vsplit->max_vertices);

   vsplit->segment_size = MIN2(SEGMENT_SIZE, vsplit->max_vertices);
}


static void vsplit_flush(struct draw_pt_front_end *frontend, unsigned flags)
{
   struct vsplit_frontend *vsplit = (struct vsplit_frontend *) frontend;

   if (flags & DRAW_FLUSH_STATE_CHANGE) {
      vsplit->middle->finish(vsplit->middle);
      vsplit->middle = NULL;
   }
}


static void vsplit_destroy(struct draw_pt_front_end *frontend)
{
   FREE(frontend);
}


struct draw_pt_front_end *draw_pt_vsplit(struct draw_context *draw)
{
   struct vsplit_frontend *vsplit = CALLOC_STRUCT(vsplit_frontend);
   ushort i;

   if (!vsplit)
      return NULL;

   vsplit->base.prepare = vsplit_prepare;
   vsplit->base.run     = NULL;
   vsplit->base.flush   = vsplit_flush;
   vsplit->base.destroy = vsplit_destroy;
   vsplit->draw = draw;

   for (i = 0; i < SEGMENT_SIZE; i++)
      vsplit->identity_draw_elts[i] = i;

   return &vsplit->base;
}