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radeonsi: emit sample locations also when nr_samples == 1
[mesa.git] / src / gallium / auxiliary / gallivm / lp_bld_sample_aos.c
1 /**************************************************************************
2 *
3 * Copyright 2010 VMware, Inc.
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 VMWARE 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 * @file
30 * Texture sampling -- AoS.
31 *
32 * @author Jose Fonseca <jfonseca@vmware.com>
33 * @author Brian Paul <brianp@vmware.com>
34 */
35
36 #include "pipe/p_defines.h"
37 #include "pipe/p_state.h"
38 #include "util/u_debug.h"
39 #include "util/u_dump.h"
40 #include "util/u_memory.h"
41 #include "util/u_math.h"
42 #include "util/u_format.h"
43 #include "util/u_cpu_detect.h"
44 #include "lp_bld_debug.h"
45 #include "lp_bld_type.h"
46 #include "lp_bld_const.h"
47 #include "lp_bld_conv.h"
48 #include "lp_bld_arit.h"
49 #include "lp_bld_bitarit.h"
50 #include "lp_bld_logic.h"
51 #include "lp_bld_swizzle.h"
52 #include "lp_bld_pack.h"
53 #include "lp_bld_flow.h"
54 #include "lp_bld_gather.h"
55 #include "lp_bld_format.h"
56 #include "lp_bld_init.h"
57 #include "lp_bld_sample.h"
58 #include "lp_bld_sample_aos.h"
59 #include "lp_bld_quad.h"
60
61
62 /**
63 * Build LLVM code for texture coord wrapping, for nearest filtering,
64 * for scaled integer texcoords.
65 * \param block_length is the length of the pixel block along the
66 * coordinate axis
67 * \param coord the incoming texcoord (s,t or r) scaled to the texture size
68 * \param coord_f the incoming texcoord (s,t or r) as float vec
69 * \param length the texture size along one dimension
70 * \param stride pixel stride along the coordinate axis (in bytes)
71 * \param offset the texel offset along the coord axis
72 * \param is_pot if TRUE, length is a power of two
73 * \param wrap_mode one of PIPE_TEX_WRAP_x
74 * \param out_offset byte offset for the wrapped coordinate
75 * \param out_i resulting sub-block pixel coordinate for coord0
76 */
77 static void
78 lp_build_sample_wrap_nearest_int(struct lp_build_sample_context *bld,
79 unsigned block_length,
80 LLVMValueRef coord,
81 LLVMValueRef coord_f,
82 LLVMValueRef length,
83 LLVMValueRef stride,
84 LLVMValueRef offset,
85 boolean is_pot,
86 unsigned wrap_mode,
87 LLVMValueRef *out_offset,
88 LLVMValueRef *out_i)
89 {
90 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
91 LLVMBuilderRef builder = bld->gallivm->builder;
92 LLVMValueRef length_minus_one;
93
94 length_minus_one = lp_build_sub(int_coord_bld, length, int_coord_bld->one);
95
96 switch(wrap_mode) {
97 case PIPE_TEX_WRAP_REPEAT:
98 if(is_pot)
99 coord = LLVMBuildAnd(builder, coord, length_minus_one, "");
100 else {
101 struct lp_build_context *coord_bld = &bld->coord_bld;
102 LLVMValueRef length_f = lp_build_int_to_float(coord_bld, length);
103 if (offset) {
104 offset = lp_build_int_to_float(coord_bld, offset);
105 offset = lp_build_div(coord_bld, offset, length_f);
106 coord_f = lp_build_add(coord_bld, coord_f, offset);
107 }
108 coord = lp_build_fract_safe(coord_bld, coord_f);
109 coord = lp_build_mul(coord_bld, coord, length_f);
110 coord = lp_build_itrunc(coord_bld, coord);
111 }
112 break;
113
114 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
115 coord = lp_build_max(int_coord_bld, coord, int_coord_bld->zero);
116 coord = lp_build_min(int_coord_bld, coord, length_minus_one);
117 break;
118
119 case PIPE_TEX_WRAP_CLAMP:
120 case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
121 case PIPE_TEX_WRAP_MIRROR_REPEAT:
122 case PIPE_TEX_WRAP_MIRROR_CLAMP:
123 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
124 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
125 default:
126 assert(0);
127 }
128
129 lp_build_sample_partial_offset(int_coord_bld, block_length, coord, stride,
130 out_offset, out_i);
131 }
132
133
134 /**
135 * Build LLVM code for texture coord wrapping, for nearest filtering,
136 * for float texcoords.
137 * \param coord the incoming texcoord (s,t or r)
138 * \param length the texture size along one dimension
139 * \param offset the texel offset along the coord axis
140 * \param is_pot if TRUE, length is a power of two
141 * \param wrap_mode one of PIPE_TEX_WRAP_x
142 * \param icoord the texcoord after wrapping, as int
143 */
144 static void
145 lp_build_sample_wrap_nearest_float(struct lp_build_sample_context *bld,
146 LLVMValueRef coord,
147 LLVMValueRef length,
148 LLVMValueRef offset,
149 boolean is_pot,
150 unsigned wrap_mode,
151 LLVMValueRef *icoord)
152 {
153 struct lp_build_context *coord_bld = &bld->coord_bld;
154 LLVMValueRef length_minus_one;
155
156 switch(wrap_mode) {
157 case PIPE_TEX_WRAP_REPEAT:
158 if (offset) {
159 /* this is definitely not ideal for POT case */
160 offset = lp_build_int_to_float(coord_bld, offset);
161 offset = lp_build_div(coord_bld, offset, length);
162 coord = lp_build_add(coord_bld, coord, offset);
163 }
164 /* take fraction, unnormalize */
165 coord = lp_build_fract_safe(coord_bld, coord);
166 coord = lp_build_mul(coord_bld, coord, length);
167 *icoord = lp_build_itrunc(coord_bld, coord);
168 break;
169 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
170 length_minus_one = lp_build_sub(coord_bld, length, coord_bld->one);
171 if (bld->static_sampler_state->normalized_coords) {
172 /* scale coord to length */
173 coord = lp_build_mul(coord_bld, coord, length);
174 }
175 if (offset) {
176 offset = lp_build_int_to_float(coord_bld, offset);
177 coord = lp_build_add(coord_bld, coord, offset);
178 }
179 coord = lp_build_clamp(coord_bld, coord, coord_bld->zero,
180 length_minus_one);
181 *icoord = lp_build_itrunc(coord_bld, coord);
182 break;
183
184 case PIPE_TEX_WRAP_CLAMP:
185 case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
186 case PIPE_TEX_WRAP_MIRROR_REPEAT:
187 case PIPE_TEX_WRAP_MIRROR_CLAMP:
188 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
189 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
190 default:
191 assert(0);
192 }
193 }
194
195
196 /**
197 * Helper to compute the first coord and the weight for
198 * linear wrap repeat npot textures
199 */
200 static void
201 lp_build_coord_repeat_npot_linear_int(struct lp_build_sample_context *bld,
202 LLVMValueRef coord_f,
203 LLVMValueRef length_i,
204 LLVMValueRef length_f,
205 LLVMValueRef *coord0_i,
206 LLVMValueRef *weight_i)
207 {
208 struct lp_build_context *coord_bld = &bld->coord_bld;
209 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
210 struct lp_build_context abs_coord_bld;
211 struct lp_type abs_type;
212 LLVMValueRef length_minus_one = lp_build_sub(int_coord_bld, length_i,
213 int_coord_bld->one);
214 LLVMValueRef mask, i32_c8, i32_c128, i32_c255;
215
216 /* wrap with normalized floats is just fract */
217 coord_f = lp_build_fract(coord_bld, coord_f);
218 /* mul by size */
219 coord_f = lp_build_mul(coord_bld, coord_f, length_f);
220 /* convert to int, compute lerp weight */
221 coord_f = lp_build_mul_imm(&bld->coord_bld, coord_f, 256);
222
223 /* At this point we don't have any negative numbers so use non-signed
224 * build context which might help on some archs.
225 */
226 abs_type = coord_bld->type;
227 abs_type.sign = 0;
228 lp_build_context_init(&abs_coord_bld, bld->gallivm, abs_type);
229 *coord0_i = lp_build_iround(&abs_coord_bld, coord_f);
230
231 /* subtract 0.5 (add -128) */
232 i32_c128 = lp_build_const_int_vec(bld->gallivm, bld->int_coord_type, -128);
233 *coord0_i = LLVMBuildAdd(bld->gallivm->builder, *coord0_i, i32_c128, "");
234
235 /* compute fractional part (AND with 0xff) */
236 i32_c255 = lp_build_const_int_vec(bld->gallivm, bld->int_coord_type, 255);
237 *weight_i = LLVMBuildAnd(bld->gallivm->builder, *coord0_i, i32_c255, "");
238
239 /* compute floor (shift right 8) */
240 i32_c8 = lp_build_const_int_vec(bld->gallivm, bld->int_coord_type, 8);
241 *coord0_i = LLVMBuildAShr(bld->gallivm->builder, *coord0_i, i32_c8, "");
242 /*
243 * we avoided the 0.5/length division before the repeat wrap,
244 * now need to fix up edge cases with selects
245 */
246 mask = lp_build_compare(int_coord_bld->gallivm, int_coord_bld->type,
247 PIPE_FUNC_LESS, *coord0_i, int_coord_bld->zero);
248 *coord0_i = lp_build_select(int_coord_bld, mask, length_minus_one, *coord0_i);
249 /*
250 * We should never get values too large - except if coord was nan or inf,
251 * in which case things go terribly wrong...
252 * Alternatively, could use fract_safe above...
253 */
254 *coord0_i = lp_build_min(int_coord_bld, *coord0_i, length_minus_one);
255 }
256
257
258 /**
259 * Build LLVM code for texture coord wrapping, for linear filtering,
260 * for scaled integer texcoords.
261 * \param block_length is the length of the pixel block along the
262 * coordinate axis
263 * \param coord0 the incoming texcoord (s,t or r) scaled to the texture size
264 * \param coord_f the incoming texcoord (s,t or r) as float vec
265 * \param length the texture size along one dimension
266 * \param stride pixel stride along the coordinate axis (in bytes)
267 * \param offset the texel offset along the coord axis
268 * \param is_pot if TRUE, length is a power of two
269 * \param wrap_mode one of PIPE_TEX_WRAP_x
270 * \param offset0 resulting relative offset for coord0
271 * \param offset1 resulting relative offset for coord0 + 1
272 * \param i0 resulting sub-block pixel coordinate for coord0
273 * \param i1 resulting sub-block pixel coordinate for coord0 + 1
274 */
275 static void
276 lp_build_sample_wrap_linear_int(struct lp_build_sample_context *bld,
277 unsigned block_length,
278 LLVMValueRef coord0,
279 LLVMValueRef *weight_i,
280 LLVMValueRef coord_f,
281 LLVMValueRef length,
282 LLVMValueRef stride,
283 LLVMValueRef offset,
284 boolean is_pot,
285 unsigned wrap_mode,
286 LLVMValueRef *offset0,
287 LLVMValueRef *offset1,
288 LLVMValueRef *i0,
289 LLVMValueRef *i1)
290 {
291 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
292 LLVMBuilderRef builder = bld->gallivm->builder;
293 LLVMValueRef length_minus_one;
294 LLVMValueRef lmask, umask, mask;
295
296 /*
297 * If the pixel block covers more than one pixel then there is no easy
298 * way to calculate offset1 relative to offset0. Instead, compute them
299 * independently. Otherwise, try to compute offset0 and offset1 with
300 * a single stride multiplication.
301 */
302
303 length_minus_one = lp_build_sub(int_coord_bld, length, int_coord_bld->one);
304
305 if (block_length != 1) {
306 LLVMValueRef coord1;
307 switch(wrap_mode) {
308 case PIPE_TEX_WRAP_REPEAT:
309 if (is_pot) {
310 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
311 coord0 = LLVMBuildAnd(builder, coord0, length_minus_one, "");
312 coord1 = LLVMBuildAnd(builder, coord1, length_minus_one, "");
313 }
314 else {
315 LLVMValueRef mask;
316 LLVMValueRef length_f = lp_build_int_to_float(&bld->coord_bld, length);
317 if (offset) {
318 offset = lp_build_int_to_float(&bld->coord_bld, offset);
319 offset = lp_build_div(&bld->coord_bld, offset, length_f);
320 coord_f = lp_build_add(&bld->coord_bld, coord_f, offset);
321 }
322 lp_build_coord_repeat_npot_linear_int(bld, coord_f,
323 length, length_f,
324 &coord0, weight_i);
325 mask = lp_build_compare(bld->gallivm, int_coord_bld->type,
326 PIPE_FUNC_NOTEQUAL, coord0, length_minus_one);
327 coord1 = LLVMBuildAnd(builder,
328 lp_build_add(int_coord_bld, coord0,
329 int_coord_bld->one),
330 mask, "");
331 }
332 break;
333
334 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
335 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
336 coord0 = lp_build_clamp(int_coord_bld, coord0, int_coord_bld->zero,
337 length_minus_one);
338 coord1 = lp_build_clamp(int_coord_bld, coord1, int_coord_bld->zero,
339 length_minus_one);
340 break;
341
342 case PIPE_TEX_WRAP_CLAMP:
343 case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
344 case PIPE_TEX_WRAP_MIRROR_REPEAT:
345 case PIPE_TEX_WRAP_MIRROR_CLAMP:
346 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
347 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
348 default:
349 assert(0);
350 coord0 = int_coord_bld->zero;
351 coord1 = int_coord_bld->zero;
352 break;
353 }
354 lp_build_sample_partial_offset(int_coord_bld, block_length, coord0, stride,
355 offset0, i0);
356 lp_build_sample_partial_offset(int_coord_bld, block_length, coord1, stride,
357 offset1, i1);
358 return;
359 }
360
361 *i0 = int_coord_bld->zero;
362 *i1 = int_coord_bld->zero;
363
364 switch(wrap_mode) {
365 case PIPE_TEX_WRAP_REPEAT:
366 if (is_pot) {
367 coord0 = LLVMBuildAnd(builder, coord0, length_minus_one, "");
368 }
369 else {
370 LLVMValueRef length_f = lp_build_int_to_float(&bld->coord_bld, length);
371 if (offset) {
372 offset = lp_build_int_to_float(&bld->coord_bld, offset);
373 offset = lp_build_div(&bld->coord_bld, offset, length_f);
374 coord_f = lp_build_add(&bld->coord_bld, coord_f, offset);
375 }
376 lp_build_coord_repeat_npot_linear_int(bld, coord_f,
377 length, length_f,
378 &coord0, weight_i);
379 }
380
381 mask = lp_build_compare(bld->gallivm, int_coord_bld->type,
382 PIPE_FUNC_NOTEQUAL, coord0, length_minus_one);
383
384 *offset0 = lp_build_mul(int_coord_bld, coord0, stride);
385 *offset1 = LLVMBuildAnd(builder,
386 lp_build_add(int_coord_bld, *offset0, stride),
387 mask, "");
388 break;
389
390 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
391 /* XXX this might be slower than the separate path
392 * on some newer cpus. With sse41 this is 8 instructions vs. 7
393 * - at least on SNB this is almost certainly slower since
394 * min/max are cheaper than selects, and the muls aren't bad.
395 */
396 lmask = lp_build_compare(int_coord_bld->gallivm, int_coord_bld->type,
397 PIPE_FUNC_GEQUAL, coord0, int_coord_bld->zero);
398 umask = lp_build_compare(int_coord_bld->gallivm, int_coord_bld->type,
399 PIPE_FUNC_LESS, coord0, length_minus_one);
400
401 coord0 = lp_build_select(int_coord_bld, lmask, coord0, int_coord_bld->zero);
402 coord0 = lp_build_select(int_coord_bld, umask, coord0, length_minus_one);
403
404 mask = LLVMBuildAnd(builder, lmask, umask, "");
405
406 *offset0 = lp_build_mul(int_coord_bld, coord0, stride);
407 *offset1 = lp_build_add(int_coord_bld,
408 *offset0,
409 LLVMBuildAnd(builder, stride, mask, ""));
410 break;
411
412 case PIPE_TEX_WRAP_CLAMP:
413 case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
414 case PIPE_TEX_WRAP_MIRROR_REPEAT:
415 case PIPE_TEX_WRAP_MIRROR_CLAMP:
416 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
417 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
418 default:
419 assert(0);
420 *offset0 = int_coord_bld->zero;
421 *offset1 = int_coord_bld->zero;
422 break;
423 }
424 }
425
426
427 /**
428 * Build LLVM code for texture coord wrapping, for linear filtering,
429 * for float texcoords.
430 * \param block_length is the length of the pixel block along the
431 * coordinate axis
432 * \param coord the incoming texcoord (s,t or r)
433 * \param length the texture size along one dimension
434 * \param offset the texel offset along the coord axis
435 * \param is_pot if TRUE, length is a power of two
436 * \param wrap_mode one of PIPE_TEX_WRAP_x
437 * \param coord0 the first texcoord after wrapping, as int
438 * \param coord1 the second texcoord after wrapping, as int
439 * \param weight the filter weight as int (0-255)
440 * \param force_nearest if this coord actually uses nearest filtering
441 */
442 static void
443 lp_build_sample_wrap_linear_float(struct lp_build_sample_context *bld,
444 unsigned block_length,
445 LLVMValueRef coord,
446 LLVMValueRef length,
447 LLVMValueRef offset,
448 boolean is_pot,
449 unsigned wrap_mode,
450 LLVMValueRef *coord0,
451 LLVMValueRef *coord1,
452 LLVMValueRef *weight,
453 unsigned force_nearest)
454 {
455 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
456 struct lp_build_context *coord_bld = &bld->coord_bld;
457 LLVMBuilderRef builder = bld->gallivm->builder;
458 LLVMValueRef half = lp_build_const_vec(bld->gallivm, coord_bld->type, 0.5);
459 LLVMValueRef length_minus_one = lp_build_sub(coord_bld, length, coord_bld->one);
460
461 switch(wrap_mode) {
462 case PIPE_TEX_WRAP_REPEAT:
463 if (is_pot) {
464 /* mul by size and subtract 0.5 */
465 coord = lp_build_mul(coord_bld, coord, length);
466 if (offset) {
467 offset = lp_build_int_to_float(coord_bld, offset);
468 coord = lp_build_add(coord_bld, coord, offset);
469 }
470 if (!force_nearest)
471 coord = lp_build_sub(coord_bld, coord, half);
472 *coord1 = lp_build_add(coord_bld, coord, coord_bld->one);
473 /* convert to int, compute lerp weight */
474 lp_build_ifloor_fract(coord_bld, coord, coord0, weight);
475 *coord1 = lp_build_ifloor(coord_bld, *coord1);
476 /* repeat wrap */
477 length_minus_one = lp_build_itrunc(coord_bld, length_minus_one);
478 *coord0 = LLVMBuildAnd(builder, *coord0, length_minus_one, "");
479 *coord1 = LLVMBuildAnd(builder, *coord1, length_minus_one, "");
480 }
481 else {
482 LLVMValueRef mask;
483 if (offset) {
484 offset = lp_build_int_to_float(coord_bld, offset);
485 offset = lp_build_div(coord_bld, offset, length);
486 coord = lp_build_add(coord_bld, coord, offset);
487 }
488 /* wrap with normalized floats is just fract */
489 coord = lp_build_fract(coord_bld, coord);
490 /* unnormalize */
491 coord = lp_build_mul(coord_bld, coord, length);
492 /*
493 * we avoided the 0.5/length division, have to fix up wrong
494 * edge cases with selects
495 */
496 *coord1 = lp_build_add(coord_bld, coord, half);
497 coord = lp_build_sub(coord_bld, coord, half);
498 *weight = lp_build_fract(coord_bld, coord);
499 /*
500 * It is important for this comparison to be unordered
501 * (or need fract_safe above).
502 */
503 mask = lp_build_compare(coord_bld->gallivm, coord_bld->type,
504 PIPE_FUNC_LESS, coord, coord_bld->zero);
505 *coord0 = lp_build_select(coord_bld, mask, length_minus_one, coord);
506 *coord0 = lp_build_itrunc(coord_bld, *coord0);
507 mask = lp_build_compare(coord_bld->gallivm, coord_bld->type,
508 PIPE_FUNC_LESS, *coord1, length);
509 *coord1 = lp_build_select(coord_bld, mask, *coord1, coord_bld->zero);
510 *coord1 = lp_build_itrunc(coord_bld, *coord1);
511 }
512 break;
513 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
514 if (bld->static_sampler_state->normalized_coords) {
515 /* mul by tex size */
516 coord = lp_build_mul(coord_bld, coord, length);
517 }
518 if (offset) {
519 offset = lp_build_int_to_float(coord_bld, offset);
520 coord = lp_build_add(coord_bld, coord, offset);
521 }
522 /* subtract 0.5 */
523 if (!force_nearest) {
524 coord = lp_build_sub(coord_bld, coord, half);
525 }
526 /* clamp to [0, length - 1] */
527 coord = lp_build_min_ext(coord_bld, coord, length_minus_one,
528 GALLIVM_NAN_RETURN_OTHER_SECOND_NONNAN);
529 coord = lp_build_max(coord_bld, coord, coord_bld->zero);
530 *coord1 = lp_build_add(coord_bld, coord, coord_bld->one);
531 /* convert to int, compute lerp weight */
532 lp_build_ifloor_fract(coord_bld, coord, coord0, weight);
533 /* coord1 = min(coord1, length-1) */
534 *coord1 = lp_build_min(coord_bld, *coord1, length_minus_one);
535 *coord1 = lp_build_itrunc(coord_bld, *coord1);
536 break;
537 default:
538 assert(0);
539 *coord0 = int_coord_bld->zero;
540 *coord1 = int_coord_bld->zero;
541 *weight = coord_bld->zero;
542 break;
543 }
544 *weight = lp_build_mul_imm(coord_bld, *weight, 256);
545 *weight = lp_build_itrunc(coord_bld, *weight);
546 return;
547 }
548
549
550 /**
551 * Fetch texels for image with nearest sampling.
552 * Return filtered color as two vectors of 16-bit fixed point values.
553 */
554 static void
555 lp_build_sample_fetch_image_nearest(struct lp_build_sample_context *bld,
556 LLVMValueRef data_ptr,
557 LLVMValueRef offset,
558 LLVMValueRef x_subcoord,
559 LLVMValueRef y_subcoord,
560 LLVMValueRef *colors)
561 {
562 /*
563 * Fetch the pixels as 4 x 32bit (rgba order might differ):
564 *
565 * rgba0 rgba1 rgba2 rgba3
566 *
567 * bit cast them into 16 x u8
568 *
569 * r0 g0 b0 a0 r1 g1 b1 a1 r2 g2 b2 a2 r3 g3 b3 a3
570 *
571 * unpack them into two 8 x i16:
572 *
573 * r0 g0 b0 a0 r1 g1 b1 a1
574 * r2 g2 b2 a2 r3 g3 b3 a3
575 *
576 * The higher 8 bits of the resulting elements will be zero.
577 */
578 LLVMBuilderRef builder = bld->gallivm->builder;
579 LLVMValueRef rgba8;
580 struct lp_build_context u8n;
581 LLVMTypeRef u8n_vec_type;
582
583 lp_build_context_init(&u8n, bld->gallivm, lp_type_unorm(8, bld->vector_width));
584 u8n_vec_type = lp_build_vec_type(bld->gallivm, u8n.type);
585
586 if (util_format_is_rgba8_variant(bld->format_desc)) {
587 /*
588 * Given the format is a rgba8, just read the pixels as is,
589 * without any swizzling. Swizzling will be done later.
590 */
591 rgba8 = lp_build_gather(bld->gallivm,
592 bld->texel_type.length,
593 bld->format_desc->block.bits,
594 bld->texel_type.width,
595 TRUE,
596 data_ptr, offset, TRUE);
597
598 rgba8 = LLVMBuildBitCast(builder, rgba8, u8n_vec_type, "");
599 }
600 else {
601 rgba8 = lp_build_fetch_rgba_aos(bld->gallivm,
602 bld->format_desc,
603 u8n.type,
604 TRUE,
605 data_ptr, offset,
606 x_subcoord,
607 y_subcoord,
608 bld->cache);
609 }
610
611 *colors = rgba8;
612 }
613
614
615 /**
616 * Sample a single texture image with nearest sampling.
617 * If sampling a cube texture, r = cube face in [0,5].
618 * Return filtered color as two vectors of 16-bit fixed point values.
619 */
620 static void
621 lp_build_sample_image_nearest(struct lp_build_sample_context *bld,
622 LLVMValueRef int_size,
623 LLVMValueRef row_stride_vec,
624 LLVMValueRef img_stride_vec,
625 LLVMValueRef data_ptr,
626 LLVMValueRef mipoffsets,
627 LLVMValueRef s,
628 LLVMValueRef t,
629 LLVMValueRef r,
630 const LLVMValueRef *offsets,
631 LLVMValueRef *colors)
632 {
633 const unsigned dims = bld->dims;
634 struct lp_build_context i32;
635 LLVMValueRef width_vec, height_vec, depth_vec;
636 LLVMValueRef s_ipart, t_ipart = NULL, r_ipart = NULL;
637 LLVMValueRef s_float, t_float = NULL, r_float = NULL;
638 LLVMValueRef x_stride;
639 LLVMValueRef x_offset, offset;
640 LLVMValueRef x_subcoord, y_subcoord, z_subcoord;
641
642 lp_build_context_init(&i32, bld->gallivm, lp_type_int_vec(32, bld->vector_width));
643
644 lp_build_extract_image_sizes(bld,
645 &bld->int_size_bld,
646 bld->int_coord_type,
647 int_size,
648 &width_vec,
649 &height_vec,
650 &depth_vec);
651
652 s_float = s; t_float = t; r_float = r;
653
654 if (bld->static_sampler_state->normalized_coords) {
655 LLVMValueRef flt_size;
656
657 flt_size = lp_build_int_to_float(&bld->float_size_bld, int_size);
658
659 lp_build_unnormalized_coords(bld, flt_size, &s, &t, &r);
660 }
661
662 /* convert float to int */
663 /* For correct rounding, need floor, not truncation here.
664 * Note that in some cases (clamp to edge, no texel offsets) we
665 * could use a non-signed build context which would help archs
666 * greatly which don't have arch rounding.
667 */
668 s_ipart = lp_build_ifloor(&bld->coord_bld, s);
669 if (dims >= 2)
670 t_ipart = lp_build_ifloor(&bld->coord_bld, t);
671 if (dims >= 3)
672 r_ipart = lp_build_ifloor(&bld->coord_bld, r);
673
674 /* add texel offsets */
675 if (offsets[0]) {
676 s_ipart = lp_build_add(&i32, s_ipart, offsets[0]);
677 if (dims >= 2) {
678 t_ipart = lp_build_add(&i32, t_ipart, offsets[1]);
679 if (dims >= 3) {
680 r_ipart = lp_build_add(&i32, r_ipart, offsets[2]);
681 }
682 }
683 }
684
685 /* get pixel, row, image strides */
686 x_stride = lp_build_const_vec(bld->gallivm,
687 bld->int_coord_bld.type,
688 bld->format_desc->block.bits/8);
689
690 /* Do texcoord wrapping, compute texel offset */
691 lp_build_sample_wrap_nearest_int(bld,
692 bld->format_desc->block.width,
693 s_ipart, s_float,
694 width_vec, x_stride, offsets[0],
695 bld->static_texture_state->pot_width,
696 bld->static_sampler_state->wrap_s,
697 &x_offset, &x_subcoord);
698 offset = x_offset;
699 if (dims >= 2) {
700 LLVMValueRef y_offset;
701 lp_build_sample_wrap_nearest_int(bld,
702 bld->format_desc->block.height,
703 t_ipart, t_float,
704 height_vec, row_stride_vec, offsets[1],
705 bld->static_texture_state->pot_height,
706 bld->static_sampler_state->wrap_t,
707 &y_offset, &y_subcoord);
708 offset = lp_build_add(&bld->int_coord_bld, offset, y_offset);
709 if (dims >= 3) {
710 LLVMValueRef z_offset;
711 lp_build_sample_wrap_nearest_int(bld,
712 1, /* block length (depth) */
713 r_ipart, r_float,
714 depth_vec, img_stride_vec, offsets[2],
715 bld->static_texture_state->pot_depth,
716 bld->static_sampler_state->wrap_r,
717 &z_offset, &z_subcoord);
718 offset = lp_build_add(&bld->int_coord_bld, offset, z_offset);
719 }
720 }
721 if (has_layer_coord(bld->static_texture_state->target)) {
722 LLVMValueRef z_offset;
723 /* The r coord is the cube face in [0,5] or array layer */
724 z_offset = lp_build_mul(&bld->int_coord_bld, r, img_stride_vec);
725 offset = lp_build_add(&bld->int_coord_bld, offset, z_offset);
726 }
727 if (mipoffsets) {
728 offset = lp_build_add(&bld->int_coord_bld, offset, mipoffsets);
729 }
730
731 lp_build_sample_fetch_image_nearest(bld, data_ptr, offset,
732 x_subcoord, y_subcoord,
733 colors);
734 }
735
736
737 /**
738 * Sample a single texture image with nearest sampling.
739 * If sampling a cube texture, r = cube face in [0,5].
740 * Return filtered color as two vectors of 16-bit fixed point values.
741 * Does address calcs (except offsets) with floats.
742 * Useful for AVX which has support for 8x32 floats but not 8x32 ints.
743 */
744 static void
745 lp_build_sample_image_nearest_afloat(struct lp_build_sample_context *bld,
746 LLVMValueRef int_size,
747 LLVMValueRef row_stride_vec,
748 LLVMValueRef img_stride_vec,
749 LLVMValueRef data_ptr,
750 LLVMValueRef mipoffsets,
751 LLVMValueRef s,
752 LLVMValueRef t,
753 LLVMValueRef r,
754 const LLVMValueRef *offsets,
755 LLVMValueRef *colors)
756 {
757 const unsigned dims = bld->dims;
758 LLVMValueRef width_vec, height_vec, depth_vec;
759 LLVMValueRef offset;
760 LLVMValueRef x_subcoord, y_subcoord;
761 LLVMValueRef x_icoord = NULL, y_icoord = NULL, z_icoord = NULL;
762 LLVMValueRef flt_size;
763
764 flt_size = lp_build_int_to_float(&bld->float_size_bld, int_size);
765
766 lp_build_extract_image_sizes(bld,
767 &bld->float_size_bld,
768 bld->coord_type,
769 flt_size,
770 &width_vec,
771 &height_vec,
772 &depth_vec);
773
774 /* Do texcoord wrapping */
775 lp_build_sample_wrap_nearest_float(bld,
776 s, width_vec, offsets[0],
777 bld->static_texture_state->pot_width,
778 bld->static_sampler_state->wrap_s,
779 &x_icoord);
780
781 if (dims >= 2) {
782 lp_build_sample_wrap_nearest_float(bld,
783 t, height_vec, offsets[1],
784 bld->static_texture_state->pot_height,
785 bld->static_sampler_state->wrap_t,
786 &y_icoord);
787
788 if (dims >= 3) {
789 lp_build_sample_wrap_nearest_float(bld,
790 r, depth_vec, offsets[2],
791 bld->static_texture_state->pot_depth,
792 bld->static_sampler_state->wrap_r,
793 &z_icoord);
794 }
795 }
796 if (has_layer_coord(bld->static_texture_state->target)) {
797 z_icoord = r;
798 }
799
800 /*
801 * From here on we deal with ints, and we should split up the 256bit
802 * vectors manually for better generated code.
803 */
804
805 /*
806 * compute texel offsets -
807 * cannot do offset calc with floats, difficult for block-based formats,
808 * and not enough precision anyway.
809 */
810 lp_build_sample_offset(&bld->int_coord_bld,
811 bld->format_desc,
812 x_icoord, y_icoord,
813 z_icoord,
814 row_stride_vec, img_stride_vec,
815 &offset,
816 &x_subcoord, &y_subcoord);
817 if (mipoffsets) {
818 offset = lp_build_add(&bld->int_coord_bld, offset, mipoffsets);
819 }
820
821 lp_build_sample_fetch_image_nearest(bld, data_ptr, offset,
822 x_subcoord, y_subcoord,
823 colors);
824 }
825
826
827 /**
828 * Fetch texels for image with linear sampling.
829 * Return filtered color as two vectors of 16-bit fixed point values.
830 */
831 static void
832 lp_build_sample_fetch_image_linear(struct lp_build_sample_context *bld,
833 LLVMValueRef data_ptr,
834 LLVMValueRef offset[2][2][2],
835 LLVMValueRef x_subcoord[2],
836 LLVMValueRef y_subcoord[2],
837 LLVMValueRef s_fpart,
838 LLVMValueRef t_fpart,
839 LLVMValueRef r_fpart,
840 LLVMValueRef *colors)
841 {
842 const unsigned dims = bld->dims;
843 LLVMBuilderRef builder = bld->gallivm->builder;
844 struct lp_build_context u8n;
845 LLVMTypeRef u8n_vec_type;
846 LLVMTypeRef elem_type = LLVMInt32TypeInContext(bld->gallivm->context);
847 LLVMValueRef shuffles[LP_MAX_VECTOR_LENGTH];
848 LLVMValueRef shuffle;
849 LLVMValueRef neighbors[2][2][2]; /* [z][y][x] */
850 LLVMValueRef packed;
851 unsigned i, j, k;
852 unsigned numj, numk;
853
854 lp_build_context_init(&u8n, bld->gallivm, lp_type_unorm(8, bld->vector_width));
855 u8n_vec_type = lp_build_vec_type(bld->gallivm, u8n.type);
856
857 /*
858 * Transform 4 x i32 in
859 *
860 * s_fpart = {s0, s1, s2, s3}
861 *
862 * where each value is between 0 and 0xff,
863 *
864 * into one 16 x i20
865 *
866 * s_fpart = {s0, s0, s0, s0, s1, s1, s1, s1, s2, s2, s2, s2, s3, s3, s3, s3}
867 *
868 * and likewise for t_fpart. There is no risk of loosing precision here
869 * since the fractional parts only use the lower 8bits.
870 */
871 s_fpart = LLVMBuildBitCast(builder, s_fpart, u8n_vec_type, "");
872 if (dims >= 2)
873 t_fpart = LLVMBuildBitCast(builder, t_fpart, u8n_vec_type, "");
874 if (dims >= 3)
875 r_fpart = LLVMBuildBitCast(builder, r_fpart, u8n_vec_type, "");
876
877 for (j = 0; j < u8n.type.length; j += 4) {
878 #ifdef PIPE_ARCH_LITTLE_ENDIAN
879 unsigned subindex = 0;
880 #else
881 unsigned subindex = 3;
882 #endif
883 LLVMValueRef index;
884
885 index = LLVMConstInt(elem_type, j + subindex, 0);
886 for (i = 0; i < 4; ++i)
887 shuffles[j + i] = index;
888 }
889
890 shuffle = LLVMConstVector(shuffles, u8n.type.length);
891
892 s_fpart = LLVMBuildShuffleVector(builder, s_fpart, u8n.undef,
893 shuffle, "");
894 if (dims >= 2) {
895 t_fpart = LLVMBuildShuffleVector(builder, t_fpart, u8n.undef,
896 shuffle, "");
897 }
898 if (dims >= 3) {
899 r_fpart = LLVMBuildShuffleVector(builder, r_fpart, u8n.undef,
900 shuffle, "");
901 }
902
903 /*
904 * Fetch the pixels as 4 x 32bit (rgba order might differ):
905 *
906 * rgba0 rgba1 rgba2 rgba3
907 *
908 * bit cast them into 16 x u8
909 *
910 * r0 g0 b0 a0 r1 g1 b1 a1 r2 g2 b2 a2 r3 g3 b3 a3
911 *
912 * unpack them into two 8 x i16:
913 *
914 * r0 g0 b0 a0 r1 g1 b1 a1
915 * r2 g2 b2 a2 r3 g3 b3 a3
916 *
917 * The higher 8 bits of the resulting elements will be zero.
918 */
919 numj = 1 + (dims >= 2);
920 numk = 1 + (dims >= 3);
921
922 for (k = 0; k < numk; k++) {
923 for (j = 0; j < numj; j++) {
924 for (i = 0; i < 2; i++) {
925 LLVMValueRef rgba8;
926
927 if (util_format_is_rgba8_variant(bld->format_desc)) {
928 /*
929 * Given the format is a rgba8, just read the pixels as is,
930 * without any swizzling. Swizzling will be done later.
931 */
932 rgba8 = lp_build_gather(bld->gallivm,
933 bld->texel_type.length,
934 bld->format_desc->block.bits,
935 bld->texel_type.width,
936 TRUE,
937 data_ptr, offset[k][j][i], TRUE);
938
939 rgba8 = LLVMBuildBitCast(builder, rgba8, u8n_vec_type, "");
940 }
941 else {
942 rgba8 = lp_build_fetch_rgba_aos(bld->gallivm,
943 bld->format_desc,
944 u8n.type,
945 TRUE,
946 data_ptr, offset[k][j][i],
947 x_subcoord[i],
948 y_subcoord[j],
949 bld->cache);
950 }
951
952 neighbors[k][j][i] = rgba8;
953 }
954 }
955 }
956
957 /*
958 * Linear interpolation with 8.8 fixed point.
959 */
960 if (bld->static_sampler_state->force_nearest_s) {
961 /* special case 1-D lerp */
962 packed = lp_build_lerp(&u8n,
963 t_fpart,
964 neighbors[0][0][0],
965 neighbors[0][0][1],
966 LP_BLD_LERP_PRESCALED_WEIGHTS);
967 }
968 else if (bld->static_sampler_state->force_nearest_t) {
969 /* special case 1-D lerp */
970 packed = lp_build_lerp(&u8n,
971 s_fpart,
972 neighbors[0][0][0],
973 neighbors[0][0][1],
974 LP_BLD_LERP_PRESCALED_WEIGHTS);
975 }
976 else {
977 /* general 1/2/3-D lerping */
978 if (dims == 1) {
979 packed = lp_build_lerp(&u8n,
980 s_fpart,
981 neighbors[0][0][0],
982 neighbors[0][0][1],
983 LP_BLD_LERP_PRESCALED_WEIGHTS);
984 } else if (dims == 2) {
985 /* 2-D lerp */
986 packed = lp_build_lerp_2d(&u8n,
987 s_fpart, t_fpart,
988 neighbors[0][0][0],
989 neighbors[0][0][1],
990 neighbors[0][1][0],
991 neighbors[0][1][1],
992 LP_BLD_LERP_PRESCALED_WEIGHTS);
993 } else {
994 /* 3-D lerp */
995 assert(dims == 3);
996 packed = lp_build_lerp_3d(&u8n,
997 s_fpart, t_fpart, r_fpart,
998 neighbors[0][0][0],
999 neighbors[0][0][1],
1000 neighbors[0][1][0],
1001 neighbors[0][1][1],
1002 neighbors[1][0][0],
1003 neighbors[1][0][1],
1004 neighbors[1][1][0],
1005 neighbors[1][1][1],
1006 LP_BLD_LERP_PRESCALED_WEIGHTS);
1007 }
1008 }
1009
1010 *colors = packed;
1011 }
1012
1013 /**
1014 * Sample a single texture image with (bi-)(tri-)linear sampling.
1015 * Return filtered color as two vectors of 16-bit fixed point values.
1016 */
1017 static void
1018 lp_build_sample_image_linear(struct lp_build_sample_context *bld,
1019 LLVMValueRef int_size,
1020 LLVMValueRef row_stride_vec,
1021 LLVMValueRef img_stride_vec,
1022 LLVMValueRef data_ptr,
1023 LLVMValueRef mipoffsets,
1024 LLVMValueRef s,
1025 LLVMValueRef t,
1026 LLVMValueRef r,
1027 const LLVMValueRef *offsets,
1028 LLVMValueRef *colors)
1029 {
1030 const unsigned dims = bld->dims;
1031 LLVMBuilderRef builder = bld->gallivm->builder;
1032 struct lp_build_context i32;
1033 LLVMValueRef i32_c8, i32_c128, i32_c255;
1034 LLVMValueRef width_vec, height_vec, depth_vec;
1035 LLVMValueRef s_ipart, s_fpart, s_float;
1036 LLVMValueRef t_ipart = NULL, t_fpart = NULL, t_float = NULL;
1037 LLVMValueRef r_ipart = NULL, r_fpart = NULL, r_float = NULL;
1038 LLVMValueRef x_stride, y_stride, z_stride;
1039 LLVMValueRef x_offset0, x_offset1;
1040 LLVMValueRef y_offset0, y_offset1;
1041 LLVMValueRef z_offset0, z_offset1;
1042 LLVMValueRef offset[2][2][2]; /* [z][y][x] */
1043 LLVMValueRef x_subcoord[2], y_subcoord[2], z_subcoord[2];
1044 unsigned x, y, z;
1045
1046 lp_build_context_init(&i32, bld->gallivm, lp_type_int_vec(32, bld->vector_width));
1047
1048 lp_build_extract_image_sizes(bld,
1049 &bld->int_size_bld,
1050 bld->int_coord_type,
1051 int_size,
1052 &width_vec,
1053 &height_vec,
1054 &depth_vec);
1055
1056 s_float = s; t_float = t; r_float = r;
1057
1058 if (bld->static_sampler_state->normalized_coords) {
1059 LLVMValueRef scaled_size;
1060 LLVMValueRef flt_size;
1061
1062 /* scale size by 256 (8 fractional bits) */
1063 scaled_size = lp_build_shl_imm(&bld->int_size_bld, int_size, 8);
1064
1065 flt_size = lp_build_int_to_float(&bld->float_size_bld, scaled_size);
1066
1067 lp_build_unnormalized_coords(bld, flt_size, &s, &t, &r);
1068 }
1069 else {
1070 /* scale coords by 256 (8 fractional bits) */
1071 s = lp_build_mul_imm(&bld->coord_bld, s, 256);
1072 if (dims >= 2)
1073 t = lp_build_mul_imm(&bld->coord_bld, t, 256);
1074 if (dims >= 3)
1075 r = lp_build_mul_imm(&bld->coord_bld, r, 256);
1076 }
1077
1078 /* convert float to int */
1079 /* For correct rounding, need round to nearest, not truncation here.
1080 * Note that in some cases (clamp to edge, no texel offsets) we
1081 * could use a non-signed build context which would help archs which
1082 * don't have fptosi intrinsic with nearest rounding implemented.
1083 */
1084 s = lp_build_iround(&bld->coord_bld, s);
1085 if (dims >= 2)
1086 t = lp_build_iround(&bld->coord_bld, t);
1087 if (dims >= 3)
1088 r = lp_build_iround(&bld->coord_bld, r);
1089
1090 /* subtract 0.5 (add -128) */
1091 i32_c128 = lp_build_const_int_vec(bld->gallivm, i32.type, -128);
1092 if (!bld->static_sampler_state->force_nearest_s) {
1093 s = LLVMBuildAdd(builder, s, i32_c128, "");
1094 }
1095 if (dims >= 2 && !bld->static_sampler_state->force_nearest_t) {
1096 t = LLVMBuildAdd(builder, t, i32_c128, "");
1097 }
1098 if (dims >= 3) {
1099 r = LLVMBuildAdd(builder, r, i32_c128, "");
1100 }
1101
1102 /* compute floor (shift right 8) */
1103 i32_c8 = lp_build_const_int_vec(bld->gallivm, i32.type, 8);
1104 s_ipart = LLVMBuildAShr(builder, s, i32_c8, "");
1105 if (dims >= 2)
1106 t_ipart = LLVMBuildAShr(builder, t, i32_c8, "");
1107 if (dims >= 3)
1108 r_ipart = LLVMBuildAShr(builder, r, i32_c8, "");
1109
1110 /* add texel offsets */
1111 if (offsets[0]) {
1112 s_ipart = lp_build_add(&i32, s_ipart, offsets[0]);
1113 if (dims >= 2) {
1114 t_ipart = lp_build_add(&i32, t_ipart, offsets[1]);
1115 if (dims >= 3) {
1116 r_ipart = lp_build_add(&i32, r_ipart, offsets[2]);
1117 }
1118 }
1119 }
1120
1121 /* compute fractional part (AND with 0xff) */
1122 i32_c255 = lp_build_const_int_vec(bld->gallivm, i32.type, 255);
1123 s_fpart = LLVMBuildAnd(builder, s, i32_c255, "");
1124 if (dims >= 2)
1125 t_fpart = LLVMBuildAnd(builder, t, i32_c255, "");
1126 if (dims >= 3)
1127 r_fpart = LLVMBuildAnd(builder, r, i32_c255, "");
1128
1129 /* get pixel, row and image strides */
1130 x_stride = lp_build_const_vec(bld->gallivm, bld->int_coord_bld.type,
1131 bld->format_desc->block.bits/8);
1132 y_stride = row_stride_vec;
1133 z_stride = img_stride_vec;
1134
1135 /* do texcoord wrapping and compute texel offsets */
1136 lp_build_sample_wrap_linear_int(bld,
1137 bld->format_desc->block.width,
1138 s_ipart, &s_fpart, s_float,
1139 width_vec, x_stride, offsets[0],
1140 bld->static_texture_state->pot_width,
1141 bld->static_sampler_state->wrap_s,
1142 &x_offset0, &x_offset1,
1143 &x_subcoord[0], &x_subcoord[1]);
1144
1145 /* add potential cube/array/mip offsets now as they are constant per pixel */
1146 if (has_layer_coord(bld->static_texture_state->target)) {
1147 LLVMValueRef z_offset;
1148 z_offset = lp_build_mul(&bld->int_coord_bld, r, img_stride_vec);
1149 /* The r coord is the cube face in [0,5] or array layer */
1150 x_offset0 = lp_build_add(&bld->int_coord_bld, x_offset0, z_offset);
1151 x_offset1 = lp_build_add(&bld->int_coord_bld, x_offset1, z_offset);
1152 }
1153 if (mipoffsets) {
1154 x_offset0 = lp_build_add(&bld->int_coord_bld, x_offset0, mipoffsets);
1155 x_offset1 = lp_build_add(&bld->int_coord_bld, x_offset1, mipoffsets);
1156 }
1157
1158 for (z = 0; z < 2; z++) {
1159 for (y = 0; y < 2; y++) {
1160 offset[z][y][0] = x_offset0;
1161 offset[z][y][1] = x_offset1;
1162 }
1163 }
1164
1165 if (dims >= 2) {
1166 lp_build_sample_wrap_linear_int(bld,
1167 bld->format_desc->block.height,
1168 t_ipart, &t_fpart, t_float,
1169 height_vec, y_stride, offsets[1],
1170 bld->static_texture_state->pot_height,
1171 bld->static_sampler_state->wrap_t,
1172 &y_offset0, &y_offset1,
1173 &y_subcoord[0], &y_subcoord[1]);
1174
1175 for (z = 0; z < 2; z++) {
1176 for (x = 0; x < 2; x++) {
1177 offset[z][0][x] = lp_build_add(&bld->int_coord_bld,
1178 offset[z][0][x], y_offset0);
1179 offset[z][1][x] = lp_build_add(&bld->int_coord_bld,
1180 offset[z][1][x], y_offset1);
1181 }
1182 }
1183 }
1184
1185 if (dims >= 3) {
1186 lp_build_sample_wrap_linear_int(bld,
1187 1, /* block length (depth) */
1188 r_ipart, &r_fpart, r_float,
1189 depth_vec, z_stride, offsets[2],
1190 bld->static_texture_state->pot_depth,
1191 bld->static_sampler_state->wrap_r,
1192 &z_offset0, &z_offset1,
1193 &z_subcoord[0], &z_subcoord[1]);
1194 for (y = 0; y < 2; y++) {
1195 for (x = 0; x < 2; x++) {
1196 offset[0][y][x] = lp_build_add(&bld->int_coord_bld,
1197 offset[0][y][x], z_offset0);
1198 offset[1][y][x] = lp_build_add(&bld->int_coord_bld,
1199 offset[1][y][x], z_offset1);
1200 }
1201 }
1202 }
1203
1204 lp_build_sample_fetch_image_linear(bld, data_ptr, offset,
1205 x_subcoord, y_subcoord,
1206 s_fpart, t_fpart, r_fpart,
1207 colors);
1208 }
1209
1210
1211 /**
1212 * Sample a single texture image with (bi-)(tri-)linear sampling.
1213 * Return filtered color as two vectors of 16-bit fixed point values.
1214 * Does address calcs (except offsets) with floats.
1215 * Useful for AVX which has support for 8x32 floats but not 8x32 ints.
1216 */
1217 static void
1218 lp_build_sample_image_linear_afloat(struct lp_build_sample_context *bld,
1219 LLVMValueRef int_size,
1220 LLVMValueRef row_stride_vec,
1221 LLVMValueRef img_stride_vec,
1222 LLVMValueRef data_ptr,
1223 LLVMValueRef mipoffsets,
1224 LLVMValueRef s,
1225 LLVMValueRef t,
1226 LLVMValueRef r,
1227 const LLVMValueRef *offsets,
1228 LLVMValueRef *colors)
1229 {
1230 const unsigned dims = bld->dims;
1231 LLVMValueRef width_vec, height_vec, depth_vec;
1232 LLVMValueRef s_fpart;
1233 LLVMValueRef t_fpart = NULL;
1234 LLVMValueRef r_fpart = NULL;
1235 LLVMValueRef x_stride, y_stride, z_stride;
1236 LLVMValueRef x_offset0, x_offset1;
1237 LLVMValueRef y_offset0, y_offset1;
1238 LLVMValueRef z_offset0, z_offset1;
1239 LLVMValueRef offset[2][2][2]; /* [z][y][x] */
1240 LLVMValueRef x_subcoord[2], y_subcoord[2];
1241 LLVMValueRef flt_size;
1242 LLVMValueRef x_icoord0, x_icoord1;
1243 LLVMValueRef y_icoord0, y_icoord1;
1244 LLVMValueRef z_icoord0, z_icoord1;
1245 unsigned x, y, z;
1246
1247 flt_size = lp_build_int_to_float(&bld->float_size_bld, int_size);
1248
1249 lp_build_extract_image_sizes(bld,
1250 &bld->float_size_bld,
1251 bld->coord_type,
1252 flt_size,
1253 &width_vec,
1254 &height_vec,
1255 &depth_vec);
1256
1257 /* do texcoord wrapping and compute texel offsets */
1258 lp_build_sample_wrap_linear_float(bld,
1259 bld->format_desc->block.width,
1260 s, width_vec, offsets[0],
1261 bld->static_texture_state->pot_width,
1262 bld->static_sampler_state->wrap_s,
1263 &x_icoord0, &x_icoord1,
1264 &s_fpart,
1265 bld->static_sampler_state->force_nearest_s);
1266
1267 if (dims >= 2) {
1268 lp_build_sample_wrap_linear_float(bld,
1269 bld->format_desc->block.height,
1270 t, height_vec, offsets[1],
1271 bld->static_texture_state->pot_height,
1272 bld->static_sampler_state->wrap_t,
1273 &y_icoord0, &y_icoord1,
1274 &t_fpart,
1275 bld->static_sampler_state->force_nearest_t);
1276
1277 if (dims >= 3) {
1278 lp_build_sample_wrap_linear_float(bld,
1279 1, /* block length (depth) */
1280 r, depth_vec, offsets[2],
1281 bld->static_texture_state->pot_depth,
1282 bld->static_sampler_state->wrap_r,
1283 &z_icoord0, &z_icoord1,
1284 &r_fpart, 0);
1285 }
1286 }
1287
1288 /*
1289 * From here on we deal with ints, and we should split up the 256bit
1290 * vectors manually for better generated code.
1291 */
1292
1293 /* get pixel, row and image strides */
1294 x_stride = lp_build_const_vec(bld->gallivm,
1295 bld->int_coord_bld.type,
1296 bld->format_desc->block.bits/8);
1297 y_stride = row_stride_vec;
1298 z_stride = img_stride_vec;
1299
1300 /*
1301 * compute texel offset -
1302 * cannot do offset calc with floats, difficult for block-based formats,
1303 * and not enough precision anyway.
1304 */
1305 lp_build_sample_partial_offset(&bld->int_coord_bld,
1306 bld->format_desc->block.width,
1307 x_icoord0, x_stride,
1308 &x_offset0, &x_subcoord[0]);
1309 lp_build_sample_partial_offset(&bld->int_coord_bld,
1310 bld->format_desc->block.width,
1311 x_icoord1, x_stride,
1312 &x_offset1, &x_subcoord[1]);
1313
1314 /* add potential cube/array/mip offsets now as they are constant per pixel */
1315 if (has_layer_coord(bld->static_texture_state->target)) {
1316 LLVMValueRef z_offset;
1317 z_offset = lp_build_mul(&bld->int_coord_bld, r, img_stride_vec);
1318 /* The r coord is the cube face in [0,5] or array layer */
1319 x_offset0 = lp_build_add(&bld->int_coord_bld, x_offset0, z_offset);
1320 x_offset1 = lp_build_add(&bld->int_coord_bld, x_offset1, z_offset);
1321 }
1322 if (mipoffsets) {
1323 x_offset0 = lp_build_add(&bld->int_coord_bld, x_offset0, mipoffsets);
1324 x_offset1 = lp_build_add(&bld->int_coord_bld, x_offset1, mipoffsets);
1325 }
1326
1327 for (z = 0; z < 2; z++) {
1328 for (y = 0; y < 2; y++) {
1329 offset[z][y][0] = x_offset0;
1330 offset[z][y][1] = x_offset1;
1331 }
1332 }
1333
1334 if (dims >= 2) {
1335 lp_build_sample_partial_offset(&bld->int_coord_bld,
1336 bld->format_desc->block.height,
1337 y_icoord0, y_stride,
1338 &y_offset0, &y_subcoord[0]);
1339 lp_build_sample_partial_offset(&bld->int_coord_bld,
1340 bld->format_desc->block.height,
1341 y_icoord1, y_stride,
1342 &y_offset1, &y_subcoord[1]);
1343 for (z = 0; z < 2; z++) {
1344 for (x = 0; x < 2; x++) {
1345 offset[z][0][x] = lp_build_add(&bld->int_coord_bld,
1346 offset[z][0][x], y_offset0);
1347 offset[z][1][x] = lp_build_add(&bld->int_coord_bld,
1348 offset[z][1][x], y_offset1);
1349 }
1350 }
1351 }
1352
1353 if (dims >= 3) {
1354 LLVMValueRef z_subcoord[2];
1355 lp_build_sample_partial_offset(&bld->int_coord_bld,
1356 1,
1357 z_icoord0, z_stride,
1358 &z_offset0, &z_subcoord[0]);
1359 lp_build_sample_partial_offset(&bld->int_coord_bld,
1360 1,
1361 z_icoord1, z_stride,
1362 &z_offset1, &z_subcoord[1]);
1363 for (y = 0; y < 2; y++) {
1364 for (x = 0; x < 2; x++) {
1365 offset[0][y][x] = lp_build_add(&bld->int_coord_bld,
1366 offset[0][y][x], z_offset0);
1367 offset[1][y][x] = lp_build_add(&bld->int_coord_bld,
1368 offset[1][y][x], z_offset1);
1369 }
1370 }
1371 }
1372
1373 lp_build_sample_fetch_image_linear(bld, data_ptr, offset,
1374 x_subcoord, y_subcoord,
1375 s_fpart, t_fpart, r_fpart,
1376 colors);
1377 }
1378
1379
1380 /**
1381 * Sample the texture/mipmap using given image filter and mip filter.
1382 * data0_ptr and data1_ptr point to the two mipmap levels to sample
1383 * from. width0/1_vec, height0/1_vec, depth0/1_vec indicate their sizes.
1384 * If we're using nearest miplevel sampling the '1' values will be null/unused.
1385 */
1386 static void
1387 lp_build_sample_mipmap(struct lp_build_sample_context *bld,
1388 unsigned img_filter,
1389 unsigned mip_filter,
1390 LLVMValueRef s,
1391 LLVMValueRef t,
1392 LLVMValueRef r,
1393 const LLVMValueRef *offsets,
1394 LLVMValueRef ilevel0,
1395 LLVMValueRef ilevel1,
1396 LLVMValueRef lod_fpart,
1397 LLVMValueRef colors_var)
1398 {
1399 LLVMBuilderRef builder = bld->gallivm->builder;
1400 LLVMValueRef size0;
1401 LLVMValueRef size1;
1402 LLVMValueRef row_stride0_vec = NULL;
1403 LLVMValueRef row_stride1_vec = NULL;
1404 LLVMValueRef img_stride0_vec = NULL;
1405 LLVMValueRef img_stride1_vec = NULL;
1406 LLVMValueRef data_ptr0;
1407 LLVMValueRef data_ptr1;
1408 LLVMValueRef mipoff0 = NULL;
1409 LLVMValueRef mipoff1 = NULL;
1410 LLVMValueRef colors0;
1411 LLVMValueRef colors1;
1412 boolean use_floats = util_cpu_caps.has_avx &&
1413 !util_cpu_caps.has_avx2 &&
1414 bld->coord_type.length > 4;
1415
1416 /* sample the first mipmap level */
1417 lp_build_mipmap_level_sizes(bld, ilevel0,
1418 &size0,
1419 &row_stride0_vec, &img_stride0_vec);
1420 if (bld->num_mips == 1) {
1421 data_ptr0 = lp_build_get_mipmap_level(bld, ilevel0);
1422 }
1423 else {
1424 /* This path should work for num_lods 1 too but slightly less efficient */
1425 data_ptr0 = bld->base_ptr;
1426 mipoff0 = lp_build_get_mip_offsets(bld, ilevel0);
1427 }
1428
1429 if (use_floats) {
1430 if (img_filter == PIPE_TEX_FILTER_NEAREST) {
1431 lp_build_sample_image_nearest_afloat(bld,
1432 size0,
1433 row_stride0_vec, img_stride0_vec,
1434 data_ptr0, mipoff0, s, t, r, offsets,
1435 &colors0);
1436 }
1437 else {
1438 assert(img_filter == PIPE_TEX_FILTER_LINEAR);
1439 lp_build_sample_image_linear_afloat(bld,
1440 size0,
1441 row_stride0_vec, img_stride0_vec,
1442 data_ptr0, mipoff0, s, t, r, offsets,
1443 &colors0);
1444 }
1445 }
1446 else {
1447 if (img_filter == PIPE_TEX_FILTER_NEAREST) {
1448 lp_build_sample_image_nearest(bld,
1449 size0,
1450 row_stride0_vec, img_stride0_vec,
1451 data_ptr0, mipoff0, s, t, r, offsets,
1452 &colors0);
1453 }
1454 else {
1455 assert(img_filter == PIPE_TEX_FILTER_LINEAR);
1456 lp_build_sample_image_linear(bld,
1457 size0,
1458 row_stride0_vec, img_stride0_vec,
1459 data_ptr0, mipoff0, s, t, r, offsets,
1460 &colors0);
1461 }
1462 }
1463
1464 /* Store the first level's colors in the output variables */
1465 LLVMBuildStore(builder, colors0, colors_var);
1466
1467 if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR) {
1468 LLVMValueRef h16vec_scale = lp_build_const_vec(bld->gallivm,
1469 bld->lodf_bld.type, 256.0);
1470 LLVMTypeRef i32vec_type = bld->lodi_bld.vec_type;
1471 struct lp_build_if_state if_ctx;
1472 LLVMValueRef need_lerp;
1473 unsigned num_quads = bld->coord_bld.type.length / 4;
1474 unsigned i;
1475
1476 lod_fpart = LLVMBuildFMul(builder, lod_fpart, h16vec_scale, "");
1477 lod_fpart = LLVMBuildFPToSI(builder, lod_fpart, i32vec_type, "lod_fpart.fixed16");
1478
1479 /* need_lerp = lod_fpart > 0 */
1480 if (bld->num_lods == 1) {
1481 need_lerp = LLVMBuildICmp(builder, LLVMIntSGT,
1482 lod_fpart, bld->lodi_bld.zero,
1483 "need_lerp");
1484 }
1485 else {
1486 /*
1487 * We'll do mip filtering if any of the quads need it.
1488 * It might be better to split the vectors here and only fetch/filter
1489 * quads which need it.
1490 */
1491 /*
1492 * We need to clamp lod_fpart here since we can get negative
1493 * values which would screw up filtering if not all
1494 * lod_fpart values have same sign.
1495 * We can however then skip the greater than comparison.
1496 */
1497 lod_fpart = lp_build_max(&bld->lodi_bld, lod_fpart,
1498 bld->lodi_bld.zero);
1499 need_lerp = lp_build_any_true_range(&bld->lodi_bld, bld->num_lods, lod_fpart);
1500 }
1501
1502 lp_build_if(&if_ctx, bld->gallivm, need_lerp);
1503 {
1504 struct lp_build_context u8n_bld;
1505
1506 lp_build_context_init(&u8n_bld, bld->gallivm, lp_type_unorm(8, bld->vector_width));
1507
1508 /* sample the second mipmap level */
1509 lp_build_mipmap_level_sizes(bld, ilevel1,
1510 &size1,
1511 &row_stride1_vec, &img_stride1_vec);
1512 if (bld->num_mips == 1) {
1513 data_ptr1 = lp_build_get_mipmap_level(bld, ilevel1);
1514 }
1515 else {
1516 data_ptr1 = bld->base_ptr;
1517 mipoff1 = lp_build_get_mip_offsets(bld, ilevel1);
1518 }
1519
1520 if (use_floats) {
1521 if (img_filter == PIPE_TEX_FILTER_NEAREST) {
1522 lp_build_sample_image_nearest_afloat(bld,
1523 size1,
1524 row_stride1_vec, img_stride1_vec,
1525 data_ptr1, mipoff1, s, t, r, offsets,
1526 &colors1);
1527 }
1528 else {
1529 lp_build_sample_image_linear_afloat(bld,
1530 size1,
1531 row_stride1_vec, img_stride1_vec,
1532 data_ptr1, mipoff1, s, t, r, offsets,
1533 &colors1);
1534 }
1535 }
1536 else {
1537 if (img_filter == PIPE_TEX_FILTER_NEAREST) {
1538 lp_build_sample_image_nearest(bld,
1539 size1,
1540 row_stride1_vec, img_stride1_vec,
1541 data_ptr1, mipoff1, s, t, r, offsets,
1542 &colors1);
1543 }
1544 else {
1545 lp_build_sample_image_linear(bld,
1546 size1,
1547 row_stride1_vec, img_stride1_vec,
1548 data_ptr1, mipoff1, s, t, r, offsets,
1549 &colors1);
1550 }
1551 }
1552
1553 /* interpolate samples from the two mipmap levels */
1554
1555 if (num_quads == 1 && bld->num_lods == 1) {
1556 lod_fpart = LLVMBuildTrunc(builder, lod_fpart, u8n_bld.elem_type, "");
1557 lod_fpart = lp_build_broadcast_scalar(&u8n_bld, lod_fpart);
1558 }
1559 else {
1560 unsigned num_chans_per_lod = 4 * bld->coord_type.length / bld->num_lods;
1561 LLVMTypeRef tmp_vec_type = LLVMVectorType(u8n_bld.elem_type, bld->lodi_bld.type.length);
1562 LLVMValueRef shuffle[LP_MAX_VECTOR_LENGTH];
1563
1564 /* Take the LSB of lod_fpart */
1565 lod_fpart = LLVMBuildTrunc(builder, lod_fpart, tmp_vec_type, "");
1566
1567 /* Broadcast each lod weight into their respective channels */
1568 for (i = 0; i < u8n_bld.type.length; ++i) {
1569 shuffle[i] = lp_build_const_int32(bld->gallivm, i / num_chans_per_lod);
1570 }
1571 lod_fpart = LLVMBuildShuffleVector(builder, lod_fpart, LLVMGetUndef(tmp_vec_type),
1572 LLVMConstVector(shuffle, u8n_bld.type.length), "");
1573 }
1574
1575 colors0 = lp_build_lerp(&u8n_bld, lod_fpart,
1576 colors0, colors1,
1577 LP_BLD_LERP_PRESCALED_WEIGHTS);
1578
1579 LLVMBuildStore(builder, colors0, colors_var);
1580 }
1581 lp_build_endif(&if_ctx);
1582 }
1583 }
1584
1585
1586
1587 /**
1588 * Texture sampling in AoS format. Used when sampling common 32-bit/texel
1589 * formats. 1D/2D/3D/cube texture supported. All mipmap sampling modes
1590 * but only limited texture coord wrap modes.
1591 */
1592 void
1593 lp_build_sample_aos(struct lp_build_sample_context *bld,
1594 unsigned sampler_unit,
1595 LLVMValueRef s,
1596 LLVMValueRef t,
1597 LLVMValueRef r,
1598 const LLVMValueRef *offsets,
1599 LLVMValueRef lod_positive,
1600 LLVMValueRef lod_fpart,
1601 LLVMValueRef ilevel0,
1602 LLVMValueRef ilevel1,
1603 LLVMValueRef texel_out[4])
1604 {
1605 LLVMBuilderRef builder = bld->gallivm->builder;
1606 const unsigned mip_filter = bld->static_sampler_state->min_mip_filter;
1607 const unsigned min_filter = bld->static_sampler_state->min_img_filter;
1608 const unsigned mag_filter = bld->static_sampler_state->mag_img_filter;
1609 const unsigned dims = bld->dims;
1610 LLVMValueRef packed_var, packed;
1611 LLVMValueRef unswizzled[4];
1612 struct lp_build_context u8n_bld;
1613
1614 /* we only support the common/simple wrap modes at this time */
1615 assert(lp_is_simple_wrap_mode(bld->static_sampler_state->wrap_s));
1616 if (dims >= 2)
1617 assert(lp_is_simple_wrap_mode(bld->static_sampler_state->wrap_t));
1618 if (dims >= 3)
1619 assert(lp_is_simple_wrap_mode(bld->static_sampler_state->wrap_r));
1620
1621
1622 /* make 8-bit unorm builder context */
1623 lp_build_context_init(&u8n_bld, bld->gallivm, lp_type_unorm(8, bld->vector_width));
1624
1625 /*
1626 * Get/interpolate texture colors.
1627 */
1628
1629 packed_var = lp_build_alloca(bld->gallivm, u8n_bld.vec_type, "packed_var");
1630
1631 if (min_filter == mag_filter) {
1632 /* no need to distinguish between minification and magnification */
1633 lp_build_sample_mipmap(bld,
1634 min_filter, mip_filter,
1635 s, t, r, offsets,
1636 ilevel0, ilevel1, lod_fpart,
1637 packed_var);
1638 }
1639 else {
1640 /* Emit conditional to choose min image filter or mag image filter
1641 * depending on the lod being > 0 or <= 0, respectively.
1642 */
1643 struct lp_build_if_state if_ctx;
1644
1645 /*
1646 * FIXME this should take all lods into account, if some are min
1647 * some max probably could hack up the weights in the linear
1648 * path with selects to work for nearest.
1649 */
1650 if (bld->num_lods > 1)
1651 lod_positive = LLVMBuildExtractElement(builder, lod_positive,
1652 lp_build_const_int32(bld->gallivm, 0), "");
1653
1654 lod_positive = LLVMBuildTrunc(builder, lod_positive,
1655 LLVMInt1TypeInContext(bld->gallivm->context), "");
1656
1657 lp_build_if(&if_ctx, bld->gallivm, lod_positive);
1658 {
1659 /* Use the minification filter */
1660 lp_build_sample_mipmap(bld,
1661 min_filter, mip_filter,
1662 s, t, r, offsets,
1663 ilevel0, ilevel1, lod_fpart,
1664 packed_var);
1665 }
1666 lp_build_else(&if_ctx);
1667 {
1668 /* Use the magnification filter */
1669 lp_build_sample_mipmap(bld,
1670 mag_filter, PIPE_TEX_MIPFILTER_NONE,
1671 s, t, r, offsets,
1672 ilevel0, NULL, NULL,
1673 packed_var);
1674 }
1675 lp_build_endif(&if_ctx);
1676 }
1677
1678 packed = LLVMBuildLoad(builder, packed_var, "");
1679
1680 /*
1681 * Convert to SoA and swizzle.
1682 */
1683 lp_build_rgba8_to_fi32_soa(bld->gallivm,
1684 bld->texel_type,
1685 packed, unswizzled);
1686
1687 if (util_format_is_rgba8_variant(bld->format_desc)) {
1688 lp_build_format_swizzle_soa(bld->format_desc,
1689 &bld->texel_bld,
1690 unswizzled, texel_out);
1691 }
1692 else {
1693 texel_out[0] = unswizzled[0];
1694 texel_out[1] = unswizzled[1];
1695 texel_out[2] = unswizzled[2];
1696 texel_out[3] = unswizzled[3];
1697 }
1698 }