summaryrefslogtreecommitdiff
path: root/src/gallium/drivers/llvmpipe/lp_bld_sample_soa.c
blob: 47b68b71e25ff5a6aae4255df93dd153ab2d0cf6 (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
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
/**************************************************************************
 *
 * Copyright 2009 VMware, Inc.
 * All Rights Reserved.
 *
 * 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, sub license, 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 (including the
 * next paragraph) 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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.
 *
 **************************************************************************/

/**
 * @file
 * Texture sampling -- SoA.
 *
 * @author Jose Fonseca <jfonseca@vmware.com>
 */

#include "pipe/p_defines.h"
#include "pipe/p_state.h"
#include "util/u_debug.h"
#include "util/u_debug_dump.h"
#include "util/u_memory.h"
#include "util/u_math.h"
#include "util/u_format.h"
#include "util/u_cpu_detect.h"
#include "lp_bld_debug.h"
#include "lp_bld_type.h"
#include "lp_bld_const.h"
#include "lp_bld_conv.h"
#include "lp_bld_arit.h"
#include "lp_bld_logic.h"
#include "lp_bld_swizzle.h"
#include "lp_bld_pack.h"
#include "lp_bld_format.h"
#include "lp_bld_sample.h"


/**
 * Keep all information for sampling code generation in a single place.
 */
struct lp_build_sample_context
{
   LLVMBuilderRef builder;

   const struct lp_sampler_static_state *static_state;

   struct lp_sampler_dynamic_state *dynamic_state;

   const struct util_format_description *format_desc;

   /** Incoming coordinates type and build context */
   struct lp_type coord_type;
   struct lp_build_context coord_bld;

   /** Integer coordinates */
   struct lp_type int_coord_type;
   struct lp_build_context int_coord_bld;

   /** Output texels type and build context */
   struct lp_type texel_type;
   struct lp_build_context texel_bld;
};


static void
lp_build_sample_texel_soa(struct lp_build_sample_context *bld,
                          LLVMValueRef x,
                          LLVMValueRef y,
                          LLVMValueRef y_stride,
                          LLVMValueRef data_ptr,
                          LLVMValueRef *texel)
{
   LLVMValueRef offset;
   LLVMValueRef packed;

   offset = lp_build_sample_offset(&bld->int_coord_bld,
                                   bld->format_desc,
                                   x, y, y_stride,
                                   data_ptr);

   assert(bld->format_desc->block.width == 1);
   assert(bld->format_desc->block.height == 1);
   assert(bld->format_desc->block.bits <= bld->texel_type.width);

   packed = lp_build_gather(bld->builder,
                            bld->texel_type.length,
                            bld->format_desc->block.bits,
                            bld->texel_type.width,
                            data_ptr, offset);

   lp_build_unpack_rgba_soa(bld->builder,
                            bld->format_desc,
                            bld->texel_type,
                            packed, texel);
}


static LLVMValueRef
lp_build_sample_packed(struct lp_build_sample_context *bld,
                       LLVMValueRef x,
                       LLVMValueRef y,
                       LLVMValueRef y_stride,
                       LLVMValueRef data_ptr)
{
   LLVMValueRef offset;

   offset = lp_build_sample_offset(&bld->int_coord_bld,
                                   bld->format_desc,
                                   x, y, y_stride,
                                   data_ptr);

   assert(bld->format_desc->block.width == 1);
   assert(bld->format_desc->block.height == 1);
   assert(bld->format_desc->block.bits <= bld->texel_type.width);

   return lp_build_gather(bld->builder,
                          bld->texel_type.length,
                          bld->format_desc->block.bits,
                          bld->texel_type.width,
                          data_ptr, offset);
}


static LLVMValueRef
lp_build_sample_wrap(struct lp_build_sample_context *bld,
                     LLVMValueRef coord,
                     LLVMValueRef length,
                     boolean is_pot,
                     unsigned wrap_mode)
{
   struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
   LLVMValueRef length_minus_one;

   length_minus_one = lp_build_sub(int_coord_bld, length, int_coord_bld->one);

   switch(wrap_mode) {
   case PIPE_TEX_WRAP_REPEAT:
      if(is_pot)
         coord = LLVMBuildAnd(bld->builder, coord, length_minus_one, "");
      else
         /* Signed remainder won't give the right results for negative
          * dividends but unsigned remainder does.*/
         coord = LLVMBuildURem(bld->builder, coord, length, "");
      break;

   case PIPE_TEX_WRAP_CLAMP:
      coord = lp_build_max(int_coord_bld, coord, int_coord_bld->zero);
      coord = lp_build_min(int_coord_bld, coord, length_minus_one);
      break;

   case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
   case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
   case PIPE_TEX_WRAP_MIRROR_REPEAT:
   case PIPE_TEX_WRAP_MIRROR_CLAMP:
   case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
   case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
      /* FIXME */
      _debug_printf("warning: failed to translate texture wrap mode %s\n",
                    debug_dump_tex_wrap(wrap_mode, TRUE));
      coord = lp_build_max(int_coord_bld, coord, int_coord_bld->zero);
      coord = lp_build_min(int_coord_bld, coord, length_minus_one);
      break;

   default:
      assert(0);
   }

   return coord;
}


static void
lp_build_sample_2d_nearest_soa(struct lp_build_sample_context *bld,
                               LLVMValueRef s,
                               LLVMValueRef t,
                               LLVMValueRef width,
                               LLVMValueRef height,
                               LLVMValueRef stride,
                               LLVMValueRef data_ptr,
                               LLVMValueRef *texel)
{
   LLVMValueRef x;
   LLVMValueRef y;

   x = lp_build_ifloor(&bld->coord_bld, s);
   y = lp_build_ifloor(&bld->coord_bld, t);

   x = lp_build_sample_wrap(bld, x, width,  bld->static_state->pot_width,  bld->static_state->wrap_s);
   y = lp_build_sample_wrap(bld, y, height, bld->static_state->pot_height, bld->static_state->wrap_t);

   lp_build_sample_texel_soa(bld, x, y, stride, data_ptr, texel);
}


static void
lp_build_sample_2d_linear_soa(struct lp_build_sample_context *bld,
                              LLVMValueRef s,
                              LLVMValueRef t,
                              LLVMValueRef width,
                              LLVMValueRef height,
                              LLVMValueRef stride,
                              LLVMValueRef data_ptr,
                              LLVMValueRef *texel)
{
   LLVMValueRef half;
   LLVMValueRef s_ipart;
   LLVMValueRef t_ipart;
   LLVMValueRef s_fpart;
   LLVMValueRef t_fpart;
   LLVMValueRef x0, x1;
   LLVMValueRef y0, y1;
   LLVMValueRef neighbors[2][2][4];
   unsigned chan;

   half = lp_build_const_scalar(bld->coord_type, 0.5);
   s = lp_build_sub(&bld->coord_bld, s, half);
   t = lp_build_sub(&bld->coord_bld, t, half);

   s_ipart = lp_build_floor(&bld->coord_bld, s);
   t_ipart = lp_build_floor(&bld->coord_bld, t);

   s_fpart = lp_build_sub(&bld->coord_bld, s, s_ipart);
   t_fpart = lp_build_sub(&bld->coord_bld, t, t_ipart);

   x0 = lp_build_itrunc(&bld->coord_bld, s_ipart);
   y0 = lp_build_itrunc(&bld->coord_bld, t_ipart);

   x0 = lp_build_sample_wrap(bld, x0, width,  bld->static_state->pot_width,  bld->static_state->wrap_s);
   y0 = lp_build_sample_wrap(bld, y0, height, bld->static_state->pot_height, bld->static_state->wrap_t);

   x1 = lp_build_add(&bld->int_coord_bld, x0, bld->int_coord_bld.one);
   y1 = lp_build_add(&bld->int_coord_bld, y0, bld->int_coord_bld.one);

   x1 = lp_build_sample_wrap(bld, x1, width,  bld->static_state->pot_width,  bld->static_state->wrap_s);
   y1 = lp_build_sample_wrap(bld, y1, height, bld->static_state->pot_height, bld->static_state->wrap_t);

   lp_build_sample_texel_soa(bld, x0, y0, stride, data_ptr, neighbors[0][0]);
   lp_build_sample_texel_soa(bld, x1, y0, stride, data_ptr, neighbors[0][1]);
   lp_build_sample_texel_soa(bld, x0, y1, stride, data_ptr, neighbors[1][0]);
   lp_build_sample_texel_soa(bld, x1, y1, stride, data_ptr, neighbors[1][1]);

   /* TODO: Don't interpolate missing channels */
   for(chan = 0; chan < 4; ++chan) {
      texel[chan] = lp_build_lerp_2d(&bld->texel_bld,
                                     s_fpart, t_fpart,
                                     neighbors[0][0][chan],
                                     neighbors[0][1][chan],
                                     neighbors[1][0][chan],
                                     neighbors[1][1][chan]);
   }
}


static void
lp_build_rgba8_to_f32_soa(LLVMBuilderRef builder,
                          struct lp_type dst_type,
                          LLVMValueRef packed,
                          LLVMValueRef *rgba)
{
   LLVMValueRef mask = lp_build_int_const_scalar(dst_type, 0xff);
   unsigned chan;

   /* Decode the input vector components */
   for (chan = 0; chan < 4; ++chan) {
      unsigned start = chan*8;
      unsigned stop = start + 8;
      LLVMValueRef input;

      input = packed;

      if(start)
         input = LLVMBuildLShr(builder, input, lp_build_int_const_scalar(dst_type, start), "");

      if(stop < 32)
         input = LLVMBuildAnd(builder, input, mask, "");

      input = lp_build_unsigned_norm_to_float(builder, 8, dst_type, input);

      rgba[chan] = input;
   }
}


static void
lp_build_sample_2d_linear_aos(struct lp_build_sample_context *bld,
                              LLVMValueRef s,
                              LLVMValueRef t,
                              LLVMValueRef width,
                              LLVMValueRef height,
                              LLVMValueRef stride,
                              LLVMValueRef data_ptr,
                              LLVMValueRef *texel)
{
   LLVMBuilderRef builder = bld->builder;
   struct lp_build_context i32, h16, u8n;
   LLVMTypeRef i32_vec_type, h16_vec_type, u8n_vec_type;
   LLVMValueRef i32_c8, i32_c128, i32_c255;
   LLVMValueRef s_ipart, s_fpart, s_fpart_lo, s_fpart_hi;
   LLVMValueRef t_ipart, t_fpart, t_fpart_lo, t_fpart_hi;
   LLVMValueRef x0, x1;
   LLVMValueRef y0, y1;
   LLVMValueRef neighbors[2][2];
   LLVMValueRef neighbors_lo[2][2];
   LLVMValueRef neighbors_hi[2][2];
   LLVMValueRef packed, packed_lo, packed_hi;
   LLVMValueRef unswizzled[4];

   lp_build_context_init(&i32, builder, lp_type_int(32));
   lp_build_context_init(&h16, builder, lp_type_ufixed(16));
   lp_build_context_init(&u8n, builder, lp_type_unorm(8));

   i32_vec_type = lp_build_vec_type(i32.type);
   h16_vec_type = lp_build_vec_type(h16.type);
   u8n_vec_type = lp_build_vec_type(u8n.type);

   s = lp_build_mul_imm(&bld->coord_bld, s, 256);
   t = lp_build_mul_imm(&bld->coord_bld, t, 256);

   s = LLVMBuildFPToSI(builder, s, i32_vec_type, "");
   t = LLVMBuildFPToSI(builder, t, i32_vec_type, "");

   i32_c128 = lp_build_int_const_scalar(i32.type, -128);
   s = LLVMBuildAdd(builder, s, i32_c128, "");
   t = LLVMBuildAdd(builder, t, i32_c128, "");

   i32_c8 = lp_build_int_const_scalar(i32.type, 8);
   s_ipart = LLVMBuildAShr(builder, s, i32_c8, "");
   t_ipart = LLVMBuildAShr(builder, t, i32_c8, "");

   i32_c255 = lp_build_int_const_scalar(i32.type, 255);
   s_fpart = LLVMBuildAnd(builder, s, i32_c255, "");
   t_fpart = LLVMBuildAnd(builder, t, i32_c255, "");

   x0 = s_ipart;
   y0 = t_ipart;

   x0 = lp_build_sample_wrap(bld, x0, width,  bld->static_state->pot_width,  bld->static_state->wrap_s);
   y0 = lp_build_sample_wrap(bld, y0, height, bld->static_state->pot_height, bld->static_state->wrap_t);

   x1 = lp_build_add(&bld->int_coord_bld, x0, bld->int_coord_bld.one);
   y1 = lp_build_add(&bld->int_coord_bld, y0, bld->int_coord_bld.one);

   x1 = lp_build_sample_wrap(bld, x1, width,  bld->static_state->pot_width,  bld->static_state->wrap_s);
   y1 = lp_build_sample_wrap(bld, y1, height, bld->static_state->pot_height, bld->static_state->wrap_t);

   /*
    * Transform 4 x i32 in
    *
    *   s_fpart = {s0, s1, s2, s3}
    *
    * into 8 x i16
    *
    *   s_fpart = {00, s0, 00, s1, 00, s2, 00, s3}
    *
    * into two 8 x i16
    *
    *   s_fpart_lo = {s0, s0, s0, s0, s1, s1, s1, s1}
    *   s_fpart_hi = {s2, s2, s2, s2, s3, s3, s3, s3}
    *
    * and likewise for t_fpart. There is no risk of loosing precision here
    * since the fractional parts only use the lower 8bits.
    */

   s_fpart = LLVMBuildBitCast(builder, s_fpart, h16_vec_type, "");
   t_fpart = LLVMBuildBitCast(builder, t_fpart, h16_vec_type, "");

   {
      LLVMTypeRef elem_type = LLVMInt32Type();
      LLVMValueRef shuffles_lo[LP_MAX_VECTOR_LENGTH];
      LLVMValueRef shuffles_hi[LP_MAX_VECTOR_LENGTH];
      LLVMValueRef shuffle_lo;
      LLVMValueRef shuffle_hi;
      unsigned i, j;

      for(j = 0; j < h16.type.length; j += 4) {
         unsigned subindex = util_cpu_caps.little_endian ? 0 : 1;
         LLVMValueRef index;

         index = LLVMConstInt(elem_type, j/2 + subindex, 0);
         for(i = 0; i < 4; ++i)
            shuffles_lo[j + i] = index;

         index = LLVMConstInt(elem_type, h16.type.length/2 + j/2 + subindex, 0);
         for(i = 0; i < 4; ++i)
            shuffles_hi[j + i] = index;
      }

      shuffle_lo = LLVMConstVector(shuffles_lo, h16.type.length);
      shuffle_hi = LLVMConstVector(shuffles_hi, h16.type.length);

      s_fpart_lo = LLVMBuildShuffleVector(builder, s_fpart, h16.undef, shuffle_lo, "");
      t_fpart_lo = LLVMBuildShuffleVector(builder, t_fpart, h16.undef, shuffle_lo, "");
      s_fpart_hi = LLVMBuildShuffleVector(builder, s_fpart, h16.undef, shuffle_hi, "");
      t_fpart_hi = LLVMBuildShuffleVector(builder, t_fpart, h16.undef, shuffle_hi, "");
   }

   /*
    * Fetch the pixels as 4 x 32bit (rgba order might differ):
    *
    *   rgba0 rgba1 rgba2 rgba3
    *
    * bit cast them into 16 x u8
    *
    *   r0 g0 b0 a0 r1 g1 b1 a1 r2 g2 b2 a2 r3 g3 b3 a3
    *
    * unpack them into two 8 x i16:
    *
    *   r0 g0 b0 a0 r1 g1 b1 a1
    *   r2 g2 b2 a2 r3 g3 b3 a3
    *
    * The higher 8 bits of the resulting elements will be zero.
    */

   neighbors[0][0] = lp_build_sample_packed(bld, x0, y0, stride, data_ptr);
   neighbors[0][1] = lp_build_sample_packed(bld, x1, y0, stride, data_ptr);
   neighbors[1][0] = lp_build_sample_packed(bld, x0, y1, stride, data_ptr);
   neighbors[1][1] = lp_build_sample_packed(bld, x1, y1, stride, data_ptr);

   neighbors[0][0] = LLVMBuildBitCast(builder, neighbors[0][0], u8n_vec_type, "");
   neighbors[0][1] = LLVMBuildBitCast(builder, neighbors[0][1], u8n_vec_type, "");
   neighbors[1][0] = LLVMBuildBitCast(builder, neighbors[1][0], u8n_vec_type, "");
   neighbors[1][1] = LLVMBuildBitCast(builder, neighbors[1][1], u8n_vec_type, "");

   lp_build_unpack2(builder, u8n.type, h16.type, neighbors[0][0], &neighbors_lo[0][0], &neighbors_hi[0][0]);
   lp_build_unpack2(builder, u8n.type, h16.type, neighbors[0][1], &neighbors_lo[0][1], &neighbors_hi[0][1]);
   lp_build_unpack2(builder, u8n.type, h16.type, neighbors[1][0], &neighbors_lo[1][0], &neighbors_hi[1][0]);
   lp_build_unpack2(builder, u8n.type, h16.type, neighbors[1][1], &neighbors_lo[1][1], &neighbors_hi[1][1]);

   /*
    * Linear interpolate with 8.8 fixed point.
    */

   packed_lo = lp_build_lerp_2d(&h16,
                                s_fpart_lo, t_fpart_lo,
                                neighbors_lo[0][0],
                                neighbors_lo[0][1],
                                neighbors_lo[1][0],
                                neighbors_lo[1][1]);

   packed_hi = lp_build_lerp_2d(&h16,
                                s_fpart_hi, t_fpart_hi,
                                neighbors_hi[0][0],
                                neighbors_hi[0][1],
                                neighbors_hi[1][0],
                                neighbors_hi[1][1]);

   packed = lp_build_pack2(builder, h16.type, u8n.type, packed_lo, packed_hi);

   /*
    * Convert to SoA and swizzle.
    */

   packed = LLVMBuildBitCast(builder, packed, i32_vec_type, "");

   lp_build_rgba8_to_f32_soa(bld->builder,
                             bld->texel_type,
                             packed, unswizzled);

   lp_build_format_swizzle_soa(bld->format_desc,
                               bld->texel_type, unswizzled,
                               texel);
}


static void
lp_build_sample_compare(struct lp_build_sample_context *bld,
                        LLVMValueRef p,
                        LLVMValueRef *texel)
{
   struct lp_build_context *texel_bld = &bld->texel_bld;
   LLVMValueRef res;
   unsigned chan;

   if(!bld->static_state->compare_mode)
      return;

   /* TODO: Compare before swizzling, to avoid redundant computations */
   res = NULL;
   for(chan = 0; chan < 4; ++chan) {
      LLVMValueRef cmp;
      cmp = lp_build_cmp(texel_bld, bld->static_state->compare_func, p, texel[chan]);
      cmp = lp_build_select(texel_bld, cmp, texel_bld->one, texel_bld->zero);

      if(res)
         res = lp_build_add(texel_bld, res, cmp);
      else
         res = cmp;
   }

   assert(res);
   res = lp_build_mul(texel_bld, res, lp_build_const_scalar(texel_bld->type, 0.25));

   /* XXX returning result for default GL_DEPTH_TEXTURE_MODE = GL_LUMINANCE */
   for(chan = 0; chan < 3; ++chan)
      texel[chan] = res;
   texel[3] = texel_bld->one;
}


void
lp_build_sample_soa(LLVMBuilderRef builder,
                    const struct lp_sampler_static_state *static_state,
                    struct lp_sampler_dynamic_state *dynamic_state,
                    struct lp_type type,
                    unsigned unit,
                    unsigned num_coords,
                    const LLVMValueRef *coords,
                    LLVMValueRef lodbias,
                    LLVMValueRef *texel)
{
   struct lp_build_sample_context bld;
   LLVMValueRef width;
   LLVMValueRef height;
   LLVMValueRef stride;
   LLVMValueRef data_ptr;
   LLVMValueRef s;
   LLVMValueRef t;
   LLVMValueRef p;

   /* Setup our build context */
   memset(&bld, 0, sizeof bld);
   bld.builder = builder;
   bld.static_state = static_state;
   bld.dynamic_state = dynamic_state;
   bld.format_desc = util_format_description(static_state->format);
   bld.coord_type = type;
   bld.int_coord_type = lp_int_type(type);
   bld.texel_type = type;
   lp_build_context_init(&bld.coord_bld, builder, bld.coord_type);
   lp_build_context_init(&bld.int_coord_bld, builder, bld.int_coord_type);
   lp_build_context_init(&bld.texel_bld, builder, bld.texel_type);

   /* Get the dynamic state */
   width = dynamic_state->width(dynamic_state, builder, unit);
   height = dynamic_state->height(dynamic_state, builder, unit);
   stride = dynamic_state->stride(dynamic_state, builder, unit);
   data_ptr = dynamic_state->data_ptr(dynamic_state, builder, unit);

   s = coords[0];
   t = coords[1];
   p = coords[2];

   width = lp_build_broadcast_scalar(&bld.int_coord_bld, width);
   height = lp_build_broadcast_scalar(&bld.int_coord_bld, height);
   stride = lp_build_broadcast_scalar(&bld.int_coord_bld, stride);

   if(static_state->target == PIPE_TEXTURE_1D)
      t = bld.coord_bld.zero;

   if(static_state->normalized_coords) {
      LLVMTypeRef coord_vec_type = lp_build_vec_type(bld.coord_type);
      LLVMValueRef fp_width = LLVMBuildSIToFP(builder, width, coord_vec_type, "");
      LLVMValueRef fp_height = LLVMBuildSIToFP(builder, height, coord_vec_type, "");
      s = lp_build_mul(&bld.coord_bld, s, fp_width);
      t = lp_build_mul(&bld.coord_bld, t, fp_height);
   }

   switch (static_state->min_img_filter) {
   case PIPE_TEX_FILTER_NEAREST:
      lp_build_sample_2d_nearest_soa(&bld, s, t, width, height, stride, data_ptr, texel);
      break;
   case PIPE_TEX_FILTER_LINEAR:
   case PIPE_TEX_FILTER_ANISO:
      if(lp_format_is_rgba8(bld.format_desc))
         lp_build_sample_2d_linear_aos(&bld, s, t, width, height, stride, data_ptr, texel);
      else
         lp_build_sample_2d_linear_soa(&bld, s, t, width, height, stride, data_ptr, texel);
      break;
   default:
      assert(0);
   }

   /* FIXME: respect static_state->min_mip_filter */;
   /* FIXME: respect static_state->mag_img_filter */;
   /* FIXME: respect static_state->prefilter */;

   lp_build_sample_compare(&bld, p, texel);
}