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gallivm: Use lp_build_div instead of lp_build_mul + lp_build_rcp.
[mesa.git] / src / gallium / auxiliary / gallivm / lp_bld_sample_soa.c
1 /**************************************************************************
2 *
3 * Copyright 2009 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 -- SoA.
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_logic.h"
50 #include "lp_bld_swizzle.h"
51 #include "lp_bld_pack.h"
52 #include "lp_bld_flow.h"
53 #include "lp_bld_gather.h"
54 #include "lp_bld_format.h"
55 #include "lp_bld_sample.h"
56 #include "lp_bld_quad.h"
57
58
59 /**
60 * Keep all information for sampling code generation in a single place.
61 */
62 struct lp_build_sample_context
63 {
64 LLVMBuilderRef builder;
65
66 const struct lp_sampler_static_state *static_state;
67
68 struct lp_sampler_dynamic_state *dynamic_state;
69
70 const struct util_format_description *format_desc;
71
72 /** regular scalar float type */
73 struct lp_type float_type;
74 struct lp_build_context float_bld;
75
76 /** regular scalar float type */
77 struct lp_type int_type;
78 struct lp_build_context int_bld;
79
80 /** Incoming coordinates type and build context */
81 struct lp_type coord_type;
82 struct lp_build_context coord_bld;
83
84 /** Unsigned integer coordinates */
85 struct lp_type uint_coord_type;
86 struct lp_build_context uint_coord_bld;
87
88 /** Signed integer coordinates */
89 struct lp_type int_coord_type;
90 struct lp_build_context int_coord_bld;
91
92 /** Output texels type and build context */
93 struct lp_type texel_type;
94 struct lp_build_context texel_bld;
95 };
96
97
98 /**
99 * Does the given texture wrap mode allow sampling the texture border color?
100 * XXX maybe move this into gallium util code.
101 */
102 static boolean
103 wrap_mode_uses_border_color(unsigned mode)
104 {
105 switch (mode) {
106 case PIPE_TEX_WRAP_REPEAT:
107 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
108 case PIPE_TEX_WRAP_MIRROR_REPEAT:
109 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
110 return FALSE;
111 case PIPE_TEX_WRAP_CLAMP:
112 case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
113 case PIPE_TEX_WRAP_MIRROR_CLAMP:
114 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
115 return TRUE;
116 default:
117 assert(0 && "unexpected wrap mode");
118 return FALSE;
119 }
120 }
121
122
123 static LLVMValueRef
124 lp_build_get_mipmap_level(struct lp_build_sample_context *bld,
125 LLVMValueRef data_array, LLVMValueRef level)
126 {
127 LLVMValueRef indexes[2], data_ptr;
128 indexes[0] = LLVMConstInt(LLVMInt32Type(), 0, 0);
129 indexes[1] = level;
130 data_ptr = LLVMBuildGEP(bld->builder, data_array, indexes, 2, "");
131 data_ptr = LLVMBuildLoad(bld->builder, data_ptr, "");
132 return data_ptr;
133 }
134
135
136 static LLVMValueRef
137 lp_build_get_const_mipmap_level(struct lp_build_sample_context *bld,
138 LLVMValueRef data_array, int level)
139 {
140 LLVMValueRef lvl = LLVMConstInt(LLVMInt32Type(), level, 0);
141 return lp_build_get_mipmap_level(bld, data_array, lvl);
142 }
143
144
145 /**
146 * Dereference stride_array[mipmap_level] array to get a stride.
147 * Return stride as a vector.
148 */
149 static LLVMValueRef
150 lp_build_get_level_stride_vec(struct lp_build_sample_context *bld,
151 LLVMValueRef stride_array, LLVMValueRef level)
152 {
153 LLVMValueRef indexes[2], stride;
154 indexes[0] = LLVMConstInt(LLVMInt32Type(), 0, 0);
155 indexes[1] = level;
156 stride = LLVMBuildGEP(bld->builder, stride_array, indexes, 2, "");
157 stride = LLVMBuildLoad(bld->builder, stride, "");
158 stride = lp_build_broadcast_scalar(&bld->int_coord_bld, stride);
159 return stride;
160 }
161
162
163 /** Dereference stride_array[0] array to get a stride (as vector). */
164 static LLVMValueRef
165 lp_build_get_const_level_stride_vec(struct lp_build_sample_context *bld,
166 LLVMValueRef stride_array, int level)
167 {
168 LLVMValueRef lvl = LLVMConstInt(LLVMInt32Type(), level, 0);
169 return lp_build_get_level_stride_vec(bld, stride_array, lvl);
170 }
171
172
173 static int
174 texture_dims(enum pipe_texture_target tex)
175 {
176 switch (tex) {
177 case PIPE_TEXTURE_1D:
178 return 1;
179 case PIPE_TEXTURE_2D:
180 case PIPE_TEXTURE_CUBE:
181 return 2;
182 case PIPE_TEXTURE_3D:
183 return 3;
184 default:
185 assert(0 && "bad texture target in texture_dims()");
186 return 2;
187 }
188 }
189
190
191 static void
192 apply_sampler_swizzle(struct lp_build_sample_context *bld,
193 LLVMValueRef *texel)
194 {
195 unsigned char swizzles[4];
196
197 swizzles[0] = bld->static_state->swizzle_r;
198 swizzles[1] = bld->static_state->swizzle_g;
199 swizzles[2] = bld->static_state->swizzle_b;
200 swizzles[3] = bld->static_state->swizzle_a;
201
202 lp_build_swizzle_soa_inplace(&bld->texel_bld, texel, swizzles);
203 }
204
205
206
207 /**
208 * Generate code to fetch a texel from a texture at int coords (x, y, z).
209 * The computation depends on whether the texture is 1D, 2D or 3D.
210 * The result, texel, will be:
211 * texel[0] = red values
212 * texel[1] = green values
213 * texel[2] = blue values
214 * texel[3] = alpha values
215 */
216 static void
217 lp_build_sample_texel_soa(struct lp_build_sample_context *bld,
218 LLVMValueRef width,
219 LLVMValueRef height,
220 LLVMValueRef depth,
221 LLVMValueRef x,
222 LLVMValueRef y,
223 LLVMValueRef z,
224 LLVMValueRef y_stride,
225 LLVMValueRef z_stride,
226 LLVMValueRef data_ptr,
227 LLVMValueRef texel_out[4])
228 {
229 const int dims = texture_dims(bld->static_state->target);
230 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
231 LLVMValueRef offset;
232 LLVMValueRef i, j;
233 LLVMValueRef use_border = NULL;
234
235 /* use_border = x < 0 || x >= width || y < 0 || y >= height */
236 if (wrap_mode_uses_border_color(bld->static_state->wrap_s)) {
237 LLVMValueRef b1, b2;
238 b1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, x, int_coord_bld->zero);
239 b2 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, x, width);
240 use_border = LLVMBuildOr(bld->builder, b1, b2, "b1_or_b2");
241 }
242
243 if (dims >= 2 && wrap_mode_uses_border_color(bld->static_state->wrap_t)) {
244 LLVMValueRef b1, b2;
245 b1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, y, int_coord_bld->zero);
246 b2 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, y, height);
247 if (use_border) {
248 use_border = LLVMBuildOr(bld->builder, use_border, b1, "ub_or_b1");
249 use_border = LLVMBuildOr(bld->builder, use_border, b2, "ub_or_b2");
250 }
251 else {
252 use_border = LLVMBuildOr(bld->builder, b1, b2, "b1_or_b2");
253 }
254 }
255
256 if (dims == 3 && wrap_mode_uses_border_color(bld->static_state->wrap_r)) {
257 LLVMValueRef b1, b2;
258 b1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, z, int_coord_bld->zero);
259 b2 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, z, depth);
260 if (use_border) {
261 use_border = LLVMBuildOr(bld->builder, use_border, b1, "ub_or_b1");
262 use_border = LLVMBuildOr(bld->builder, use_border, b2, "ub_or_b2");
263 }
264 else {
265 use_border = LLVMBuildOr(bld->builder, b1, b2, "b1_or_b2");
266 }
267 }
268
269 /* convert x,y,z coords to linear offset from start of texture, in bytes */
270 lp_build_sample_offset(&bld->uint_coord_bld,
271 bld->format_desc,
272 x, y, z, y_stride, z_stride,
273 &offset, &i, &j);
274
275 if (use_border) {
276 /* If we can sample the border color, it means that texcoords may
277 * lie outside the bounds of the texture image. We need to do
278 * something to prevent reading out of bounds and causing a segfault.
279 *
280 * Simply AND the texture coords with !use_border. This will cause
281 * coords which are out of bounds to become zero. Zero's guaranteed
282 * to be inside the texture image.
283 */
284 offset = lp_build_andc(&bld->uint_coord_bld, offset, use_border);
285 }
286
287 lp_build_fetch_rgba_soa(bld->builder,
288 bld->format_desc,
289 bld->texel_type,
290 data_ptr, offset,
291 i, j,
292 texel_out);
293
294 apply_sampler_swizzle(bld, texel_out);
295
296 /*
297 * Note: if we find an app which frequently samples the texture border
298 * we might want to implement a true conditional here to avoid sampling
299 * the texture whenever possible (since that's quite a bit of code).
300 * Ex:
301 * if (use_border) {
302 * texel = border_color;
303 * }
304 * else {
305 * texel = sample_texture(coord);
306 * }
307 * As it is now, we always sample the texture, then selectively replace
308 * the texel color results with the border color.
309 */
310
311 if (use_border) {
312 /* select texel color or border color depending on use_border */
313 int chan;
314 for (chan = 0; chan < 4; chan++) {
315 LLVMValueRef border_chan =
316 lp_build_const_vec(bld->texel_type,
317 bld->static_state->border_color[chan]);
318 texel_out[chan] = lp_build_select(&bld->texel_bld, use_border,
319 border_chan, texel_out[chan]);
320 }
321 }
322 }
323
324
325 /**
326 * Fetch the texels as <4n x i8> in AoS form.
327 */
328 static LLVMValueRef
329 lp_build_sample_packed(struct lp_build_sample_context *bld,
330 LLVMValueRef x,
331 LLVMValueRef y,
332 LLVMValueRef y_stride,
333 LLVMValueRef data_array)
334 {
335 LLVMValueRef offset, i, j;
336 LLVMValueRef data_ptr;
337 LLVMValueRef res;
338
339 /* convert x,y,z coords to linear offset from start of texture, in bytes */
340 lp_build_sample_offset(&bld->uint_coord_bld,
341 bld->format_desc,
342 x, y, NULL, y_stride, NULL,
343 &offset, &i, &j);
344
345 /* get pointer to mipmap level 0 data */
346 data_ptr = lp_build_get_const_mipmap_level(bld, data_array, 0);
347
348 if (util_format_is_rgba8_variant(bld->format_desc)) {
349 /* Just fetch the data directly without swizzling */
350 assert(bld->format_desc->block.width == 1);
351 assert(bld->format_desc->block.height == 1);
352 assert(bld->format_desc->block.bits <= bld->texel_type.width);
353
354 res = lp_build_gather(bld->builder,
355 bld->texel_type.length,
356 bld->format_desc->block.bits,
357 bld->texel_type.width,
358 data_ptr, offset);
359 }
360 else {
361 struct lp_type type;
362
363 assert(bld->texel_type.width == 32);
364
365 memset(&type, 0, sizeof type);
366 type.width = 8;
367 type.length = bld->texel_type.length*4;
368 type.norm = TRUE;
369
370 res = lp_build_fetch_rgba_aos(bld->builder, bld->format_desc, type,
371 data_ptr, offset, i, j);
372 }
373
374 return res;
375 }
376
377
378 /**
379 * Helper to compute the mirror function for the PIPE_WRAP_MIRROR modes.
380 */
381 static LLVMValueRef
382 lp_build_coord_mirror(struct lp_build_sample_context *bld,
383 LLVMValueRef coord)
384 {
385 struct lp_build_context *coord_bld = &bld->coord_bld;
386 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
387 LLVMValueRef fract, flr, isOdd;
388
389 /* fract = coord - floor(coord) */
390 fract = lp_build_sub(coord_bld, coord, lp_build_floor(coord_bld, coord));
391
392 /* flr = ifloor(coord); */
393 flr = lp_build_ifloor(coord_bld, coord);
394
395 /* isOdd = flr & 1 */
396 isOdd = LLVMBuildAnd(bld->builder, flr, int_coord_bld->one, "");
397
398 /* make coord positive or negative depending on isOdd */
399 coord = lp_build_set_sign(coord_bld, fract, isOdd);
400
401 /* convert isOdd to float */
402 isOdd = lp_build_int_to_float(coord_bld, isOdd);
403
404 /* add isOdd to coord */
405 coord = lp_build_add(coord_bld, coord, isOdd);
406
407 return coord;
408 }
409
410
411 /**
412 * We only support a few wrap modes in lp_build_sample_wrap_int() at this time.
413 * Return whether the given mode is supported by that function.
414 */
415 static boolean
416 is_simple_wrap_mode(unsigned mode)
417 {
418 switch (mode) {
419 case PIPE_TEX_WRAP_REPEAT:
420 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
421 return TRUE;
422 default:
423 return FALSE;
424 }
425 }
426
427
428 /**
429 * Build LLVM code for texture wrap mode, for scaled integer texcoords.
430 * \param coord the incoming texcoord (s,t,r or q) scaled to the texture size
431 * \param length the texture size along one dimension
432 * \param is_pot if TRUE, length is a power of two
433 * \param wrap_mode one of PIPE_TEX_WRAP_x
434 */
435 static LLVMValueRef
436 lp_build_sample_wrap_int(struct lp_build_sample_context *bld,
437 LLVMValueRef coord,
438 LLVMValueRef length,
439 boolean is_pot,
440 unsigned wrap_mode)
441 {
442 struct lp_build_context *uint_coord_bld = &bld->uint_coord_bld;
443 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
444 LLVMValueRef length_minus_one;
445
446 length_minus_one = lp_build_sub(uint_coord_bld, length, uint_coord_bld->one);
447
448 switch(wrap_mode) {
449 case PIPE_TEX_WRAP_REPEAT:
450 if(is_pot)
451 coord = LLVMBuildAnd(bld->builder, coord, length_minus_one, "");
452 else
453 /* Signed remainder won't give the right results for negative
454 * dividends but unsigned remainder does.*/
455 coord = LLVMBuildURem(bld->builder, coord, length, "");
456 break;
457
458 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
459 coord = lp_build_max(int_coord_bld, coord, int_coord_bld->zero);
460 coord = lp_build_min(int_coord_bld, coord, length_minus_one);
461 break;
462
463 case PIPE_TEX_WRAP_CLAMP:
464 case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
465 case PIPE_TEX_WRAP_MIRROR_REPEAT:
466 case PIPE_TEX_WRAP_MIRROR_CLAMP:
467 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
468 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
469 default:
470 assert(0);
471 }
472
473 return coord;
474 }
475
476
477 /**
478 * Build LLVM code for texture wrap mode for linear filtering.
479 * \param x0_out returns first integer texcoord
480 * \param x1_out returns second integer texcoord
481 * \param weight_out returns linear interpolation weight
482 */
483 static void
484 lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
485 LLVMValueRef coord,
486 LLVMValueRef length,
487 boolean is_pot,
488 unsigned wrap_mode,
489 LLVMValueRef *x0_out,
490 LLVMValueRef *x1_out,
491 LLVMValueRef *weight_out)
492 {
493 struct lp_build_context *coord_bld = &bld->coord_bld;
494 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
495 struct lp_build_context *uint_coord_bld = &bld->uint_coord_bld;
496 LLVMValueRef half = lp_build_const_vec(coord_bld->type, 0.5);
497 LLVMValueRef length_f = lp_build_int_to_float(coord_bld, length);
498 LLVMValueRef length_minus_one = lp_build_sub(uint_coord_bld, length, uint_coord_bld->one);
499 LLVMValueRef coord0, coord1, weight;
500
501 switch(wrap_mode) {
502 case PIPE_TEX_WRAP_REPEAT:
503 /* mul by size and subtract 0.5 */
504 coord = lp_build_mul(coord_bld, coord, length_f);
505 coord = lp_build_sub(coord_bld, coord, half);
506 /* convert to int */
507 coord0 = lp_build_ifloor(coord_bld, coord);
508 coord1 = lp_build_add(uint_coord_bld, coord0, uint_coord_bld->one);
509 /* compute lerp weight */
510 weight = lp_build_fract(coord_bld, coord);
511 /* repeat wrap */
512 if (is_pot) {
513 coord0 = LLVMBuildAnd(bld->builder, coord0, length_minus_one, "");
514 coord1 = LLVMBuildAnd(bld->builder, coord1, length_minus_one, "");
515 }
516 else {
517 /* Signed remainder won't give the right results for negative
518 * dividends but unsigned remainder does.*/
519 coord0 = LLVMBuildURem(bld->builder, coord0, length, "");
520 coord1 = LLVMBuildURem(bld->builder, coord1, length, "");
521 }
522 break;
523
524 case PIPE_TEX_WRAP_CLAMP:
525 if (bld->static_state->normalized_coords) {
526 /* scale coord to length */
527 coord = lp_build_mul(coord_bld, coord, length_f);
528 }
529
530 /* clamp to [0, length] */
531 coord = lp_build_clamp(coord_bld, coord, coord_bld->zero, length_f);
532
533 coord = lp_build_sub(coord_bld, coord, half);
534
535 weight = lp_build_fract(coord_bld, coord);
536 coord0 = lp_build_ifloor(coord_bld, coord);
537 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
538 break;
539
540 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
541 if (bld->static_state->normalized_coords) {
542 /* clamp to [0,1] */
543 coord = lp_build_clamp(coord_bld, coord, coord_bld->zero, coord_bld->one);
544 /* mul by tex size and subtract 0.5 */
545 coord = lp_build_mul(coord_bld, coord, length_f);
546 coord = lp_build_sub(coord_bld, coord, half);
547 }
548 else {
549 LLVMValueRef min, max;
550 /* clamp to [0.5, length - 0.5] */
551 min = half;
552 max = lp_build_sub(coord_bld, length_f, min);
553 coord = lp_build_clamp(coord_bld, coord, min, max);
554 }
555 /* compute lerp weight */
556 weight = lp_build_fract(coord_bld, coord);
557 /* coord0 = floor(coord); */
558 coord0 = lp_build_ifloor(coord_bld, coord);
559 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
560 /* coord0 = max(coord0, 0) */
561 coord0 = lp_build_max(int_coord_bld, coord0, int_coord_bld->zero);
562 /* coord1 = min(coord1, length-1) */
563 coord1 = lp_build_min(int_coord_bld, coord1, length_minus_one);
564 break;
565
566 case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
567 {
568 LLVMValueRef min, max;
569 if (bld->static_state->normalized_coords) {
570 /* scale coord to length */
571 coord = lp_build_mul(coord_bld, coord, length_f);
572 }
573 /* clamp to [-0.5, length + 0.5] */
574 min = lp_build_const_vec(coord_bld->type, -0.5F);
575 max = lp_build_sub(coord_bld, length_f, min);
576 coord = lp_build_clamp(coord_bld, coord, min, max);
577 coord = lp_build_sub(coord_bld, coord, half);
578 /* compute lerp weight */
579 weight = lp_build_fract(coord_bld, coord);
580 /* convert to int */
581 coord0 = lp_build_ifloor(coord_bld, coord);
582 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
583 }
584 break;
585
586 case PIPE_TEX_WRAP_MIRROR_REPEAT:
587 /* compute mirror function */
588 coord = lp_build_coord_mirror(bld, coord);
589
590 /* scale coord to length */
591 coord = lp_build_mul(coord_bld, coord, length_f);
592 coord = lp_build_sub(coord_bld, coord, half);
593
594 /* compute lerp weight */
595 weight = lp_build_fract(coord_bld, coord);
596
597 /* convert to int coords */
598 coord0 = lp_build_ifloor(coord_bld, coord);
599 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
600
601 /* coord0 = max(coord0, 0) */
602 coord0 = lp_build_max(int_coord_bld, coord0, int_coord_bld->zero);
603 /* coord1 = min(coord1, length-1) */
604 coord1 = lp_build_min(int_coord_bld, coord1, length_minus_one);
605 break;
606
607 case PIPE_TEX_WRAP_MIRROR_CLAMP:
608 coord = lp_build_abs(coord_bld, coord);
609
610 if (bld->static_state->normalized_coords) {
611 /* scale coord to length */
612 coord = lp_build_mul(coord_bld, coord, length_f);
613 }
614
615 /* clamp to [0, length] */
616 coord = lp_build_min(coord_bld, coord, length_f);
617
618 coord = lp_build_sub(coord_bld, coord, half);
619
620 weight = lp_build_fract(coord_bld, coord);
621 coord0 = lp_build_ifloor(coord_bld, coord);
622 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
623 break;
624
625 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
626 {
627 LLVMValueRef min, max;
628
629 coord = lp_build_abs(coord_bld, coord);
630
631 if (bld->static_state->normalized_coords) {
632 /* scale coord to length */
633 coord = lp_build_mul(coord_bld, coord, length_f);
634 }
635
636 /* clamp to [0.5, length - 0.5] */
637 min = half;
638 max = lp_build_sub(coord_bld, length_f, min);
639 coord = lp_build_clamp(coord_bld, coord, min, max);
640
641 coord = lp_build_sub(coord_bld, coord, half);
642
643 weight = lp_build_fract(coord_bld, coord);
644 coord0 = lp_build_ifloor(coord_bld, coord);
645 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
646 }
647 break;
648
649 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
650 {
651 LLVMValueRef min, max;
652
653 coord = lp_build_abs(coord_bld, coord);
654
655 if (bld->static_state->normalized_coords) {
656 /* scale coord to length */
657 coord = lp_build_mul(coord_bld, coord, length_f);
658 }
659
660 /* clamp to [-0.5, length + 0.5] */
661 min = lp_build_negate(coord_bld, half);
662 max = lp_build_sub(coord_bld, length_f, min);
663 coord = lp_build_clamp(coord_bld, coord, min, max);
664
665 coord = lp_build_sub(coord_bld, coord, half);
666
667 weight = lp_build_fract(coord_bld, coord);
668 coord0 = lp_build_ifloor(coord_bld, coord);
669 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
670 }
671 break;
672
673 default:
674 assert(0);
675 coord0 = NULL;
676 coord1 = NULL;
677 weight = NULL;
678 }
679
680 *x0_out = coord0;
681 *x1_out = coord1;
682 *weight_out = weight;
683 }
684
685
686 /**
687 * Build LLVM code for texture wrap mode for nearest filtering.
688 * \param coord the incoming texcoord (nominally in [0,1])
689 * \param length the texture size along one dimension, as int
690 * \param is_pot if TRUE, length is a power of two
691 * \param wrap_mode one of PIPE_TEX_WRAP_x
692 */
693 static LLVMValueRef
694 lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
695 LLVMValueRef coord,
696 LLVMValueRef length,
697 boolean is_pot,
698 unsigned wrap_mode)
699 {
700 struct lp_build_context *coord_bld = &bld->coord_bld;
701 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
702 struct lp_build_context *uint_coord_bld = &bld->uint_coord_bld;
703 LLVMValueRef length_f = lp_build_int_to_float(coord_bld, length);
704 LLVMValueRef length_minus_one = lp_build_sub(uint_coord_bld, length, uint_coord_bld->one);
705 LLVMValueRef icoord;
706
707 switch(wrap_mode) {
708 case PIPE_TEX_WRAP_REPEAT:
709 coord = lp_build_mul(coord_bld, coord, length_f);
710 icoord = lp_build_ifloor(coord_bld, coord);
711 if (is_pot)
712 icoord = LLVMBuildAnd(bld->builder, icoord, length_minus_one, "");
713 else
714 /* Signed remainder won't give the right results for negative
715 * dividends but unsigned remainder does.*/
716 icoord = LLVMBuildURem(bld->builder, icoord, length, "");
717 break;
718
719 case PIPE_TEX_WRAP_CLAMP:
720 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
721 if (bld->static_state->normalized_coords) {
722 /* scale coord to length */
723 coord = lp_build_mul(coord_bld, coord, length_f);
724 }
725
726 /* floor */
727 icoord = lp_build_ifloor(coord_bld, coord);
728
729 /* clamp to [0, length - 1]. */
730 icoord = lp_build_clamp(int_coord_bld, icoord, int_coord_bld->zero,
731 length_minus_one);
732 break;
733
734 case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
735 /* Note: this is the same as CLAMP_TO_EDGE, except min = -min */
736 {
737 LLVMValueRef min, max;
738
739 if (bld->static_state->normalized_coords) {
740 /* scale coord to length */
741 coord = lp_build_mul(coord_bld, coord, length_f);
742 }
743
744 icoord = lp_build_ifloor(coord_bld, coord);
745
746 /* clamp to [-1, length] */
747 min = lp_build_negate(int_coord_bld, int_coord_bld->one);
748 max = length;
749 icoord = lp_build_clamp(int_coord_bld, icoord, min, max);
750 }
751 break;
752
753 case PIPE_TEX_WRAP_MIRROR_REPEAT:
754 /* compute mirror function */
755 coord = lp_build_coord_mirror(bld, coord);
756
757 /* scale coord to length */
758 assert(bld->static_state->normalized_coords);
759 coord = lp_build_mul(coord_bld, coord, length_f);
760
761 icoord = lp_build_ifloor(coord_bld, coord);
762
763 /* clamp to [0, length - 1] */
764 icoord = lp_build_min(int_coord_bld, icoord, length_minus_one);
765 break;
766
767 case PIPE_TEX_WRAP_MIRROR_CLAMP:
768 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
769 coord = lp_build_abs(coord_bld, coord);
770
771 if (bld->static_state->normalized_coords) {
772 /* scale coord to length */
773 coord = lp_build_mul(coord_bld, coord, length_f);
774 }
775
776 icoord = lp_build_ifloor(coord_bld, coord);
777
778 /* clamp to [0, length - 1] */
779 icoord = lp_build_min(int_coord_bld, icoord, length_minus_one);
780 break;
781
782 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
783 coord = lp_build_abs(coord_bld, coord);
784
785 if (bld->static_state->normalized_coords) {
786 /* scale coord to length */
787 coord = lp_build_mul(coord_bld, coord, length_f);
788 }
789
790 icoord = lp_build_ifloor(coord_bld, coord);
791
792 /* clamp to [0, length] */
793 icoord = lp_build_min(int_coord_bld, icoord, length);
794 break;
795
796 default:
797 assert(0);
798 icoord = NULL;
799 }
800
801 return icoord;
802 }
803
804
805 /**
806 * Codegen equivalent for u_minify().
807 * Return max(1, base_size >> level);
808 */
809 static LLVMValueRef
810 lp_build_minify(struct lp_build_sample_context *bld,
811 LLVMValueRef base_size,
812 LLVMValueRef level)
813 {
814 LLVMValueRef size = LLVMBuildLShr(bld->builder, base_size, level, "minify");
815 size = lp_build_max(&bld->int_coord_bld, size, bld->int_coord_bld.one);
816 return size;
817 }
818
819
820 /**
821 * Generate code to compute texture level of detail (lambda).
822 * \param ddx partial derivatives of (s, t, r, q) with respect to X
823 * \param ddy partial derivatives of (s, t, r, q) with respect to Y
824 * \param lod_bias optional float vector with the shader lod bias
825 * \param explicit_lod optional float vector with the explicit lod
826 * \param width scalar int texture width
827 * \param height scalar int texture height
828 * \param depth scalar int texture depth
829 *
830 * XXX: The resulting lod is scalar, so ignore all but the first element of
831 * derivatives, lod_bias, etc that are passed by the shader.
832 */
833 static LLVMValueRef
834 lp_build_lod_selector(struct lp_build_sample_context *bld,
835 const LLVMValueRef ddx[4],
836 const LLVMValueRef ddy[4],
837 LLVMValueRef lod_bias, /* optional */
838 LLVMValueRef explicit_lod, /* optional */
839 LLVMValueRef width,
840 LLVMValueRef height,
841 LLVMValueRef depth)
842
843 {
844 if (bld->static_state->min_lod == bld->static_state->max_lod) {
845 /* User is forcing sampling from a particular mipmap level.
846 * This is hit during mipmap generation.
847 */
848 return LLVMConstReal(LLVMFloatType(), bld->static_state->min_lod);
849 }
850 else {
851 struct lp_build_context *float_bld = &bld->float_bld;
852 LLVMValueRef sampler_lod_bias = LLVMConstReal(LLVMFloatType(),
853 bld->static_state->lod_bias);
854 LLVMValueRef min_lod = LLVMConstReal(LLVMFloatType(),
855 bld->static_state->min_lod);
856 LLVMValueRef max_lod = LLVMConstReal(LLVMFloatType(),
857 bld->static_state->max_lod);
858 LLVMValueRef index0 = LLVMConstInt(LLVMInt32Type(), 0, 0);
859 LLVMValueRef lod;
860
861 if (explicit_lod) {
862 lod = LLVMBuildExtractElement(bld->builder, explicit_lod,
863 index0, "");
864 }
865 else {
866 const int dims = texture_dims(bld->static_state->target);
867 LLVMValueRef dsdx, dsdy;
868 LLVMValueRef dtdx = NULL, dtdy = NULL, drdx = NULL, drdy = NULL;
869 LLVMValueRef rho;
870
871 dsdx = LLVMBuildExtractElement(bld->builder, ddx[0], index0, "dsdx");
872 dsdx = lp_build_abs(float_bld, dsdx);
873 dsdy = LLVMBuildExtractElement(bld->builder, ddy[0], index0, "dsdy");
874 dsdy = lp_build_abs(float_bld, dsdy);
875 if (dims > 1) {
876 dtdx = LLVMBuildExtractElement(bld->builder, ddx[1], index0, "dtdx");
877 dtdx = lp_build_abs(float_bld, dtdx);
878 dtdy = LLVMBuildExtractElement(bld->builder, ddy[1], index0, "dtdy");
879 dtdy = lp_build_abs(float_bld, dtdy);
880 if (dims > 2) {
881 drdx = LLVMBuildExtractElement(bld->builder, ddx[2], index0, "drdx");
882 drdx = lp_build_abs(float_bld, drdx);
883 drdy = LLVMBuildExtractElement(bld->builder, ddy[2], index0, "drdy");
884 drdy = lp_build_abs(float_bld, drdy);
885 }
886 }
887
888 /* Compute rho = max of all partial derivatives scaled by texture size.
889 * XXX this could be vectorized somewhat
890 */
891 rho = LLVMBuildFMul(bld->builder,
892 lp_build_max(float_bld, dsdx, dsdy),
893 lp_build_int_to_float(float_bld, width), "");
894 if (dims > 1) {
895 LLVMValueRef max;
896 max = LLVMBuildFMul(bld->builder,
897 lp_build_max(float_bld, dtdx, dtdy),
898 lp_build_int_to_float(float_bld, height), "");
899 rho = lp_build_max(float_bld, rho, max);
900 if (dims > 2) {
901 max = LLVMBuildFMul(bld->builder,
902 lp_build_max(float_bld, drdx, drdy),
903 lp_build_int_to_float(float_bld, depth), "");
904 rho = lp_build_max(float_bld, rho, max);
905 }
906 }
907
908 /* compute lod = log2(rho) */
909 lod = lp_build_log2(float_bld, rho);
910
911 /* add shader lod bias */
912 if (lod_bias) {
913 lod_bias = LLVMBuildExtractElement(bld->builder, lod_bias,
914 index0, "");
915 lod = LLVMBuildFAdd(bld->builder, lod, lod_bias, "shader_lod_bias");
916 }
917 }
918
919 /* add sampler lod bias */
920 lod = LLVMBuildFAdd(bld->builder, lod, sampler_lod_bias, "sampler_lod_bias");
921
922 /* clamp lod */
923 lod = lp_build_clamp(float_bld, lod, min_lod, max_lod);
924
925 return lod;
926 }
927 }
928
929
930 /**
931 * For PIPE_TEX_MIPFILTER_NEAREST, convert float LOD to integer
932 * mipmap level index.
933 * Note: this is all scalar code.
934 * \param lod scalar float texture level of detail
935 * \param level_out returns integer
936 */
937 static void
938 lp_build_nearest_mip_level(struct lp_build_sample_context *bld,
939 unsigned unit,
940 LLVMValueRef lod,
941 LLVMValueRef *level_out)
942 {
943 struct lp_build_context *float_bld = &bld->float_bld;
944 struct lp_build_context *int_bld = &bld->int_bld;
945 LLVMValueRef last_level, level;
946
947 LLVMValueRef zero = LLVMConstInt(LLVMInt32Type(), 0, 0);
948
949 last_level = bld->dynamic_state->last_level(bld->dynamic_state,
950 bld->builder, unit);
951
952 /* convert float lod to integer */
953 level = lp_build_iround(float_bld, lod);
954
955 /* clamp level to legal range of levels */
956 *level_out = lp_build_clamp(int_bld, level, zero, last_level);
957 }
958
959
960 /**
961 * For PIPE_TEX_MIPFILTER_LINEAR, convert float LOD to integer to
962 * two (adjacent) mipmap level indexes. Later, we'll sample from those
963 * two mipmap levels and interpolate between them.
964 */
965 static void
966 lp_build_linear_mip_levels(struct lp_build_sample_context *bld,
967 unsigned unit,
968 LLVMValueRef lod,
969 LLVMValueRef *level0_out,
970 LLVMValueRef *level1_out,
971 LLVMValueRef *weight_out)
972 {
973 struct lp_build_context *float_bld = &bld->float_bld;
974 struct lp_build_context *int_bld = &bld->int_bld;
975 LLVMValueRef last_level, level;
976
977 last_level = bld->dynamic_state->last_level(bld->dynamic_state,
978 bld->builder, unit);
979
980 /* convert float lod to integer */
981 level = lp_build_ifloor(float_bld, lod);
982
983 /* compute level 0 and clamp to legal range of levels */
984 *level0_out = lp_build_clamp(int_bld, level,
985 int_bld->zero,
986 last_level);
987 /* compute level 1 and clamp to legal range of levels */
988 level = lp_build_add(int_bld, level, int_bld->one);
989 *level1_out = lp_build_clamp(int_bld, level,
990 int_bld->zero,
991 last_level);
992
993 *weight_out = lp_build_fract(float_bld, lod);
994 }
995
996
997 /**
998 * Generate code to sample a mipmap level with nearest filtering.
999 * If sampling a cube texture, r = cube face in [0,5].
1000 */
1001 static void
1002 lp_build_sample_image_nearest(struct lp_build_sample_context *bld,
1003 LLVMValueRef width_vec,
1004 LLVMValueRef height_vec,
1005 LLVMValueRef depth_vec,
1006 LLVMValueRef row_stride_vec,
1007 LLVMValueRef img_stride_vec,
1008 LLVMValueRef data_ptr,
1009 LLVMValueRef s,
1010 LLVMValueRef t,
1011 LLVMValueRef r,
1012 LLVMValueRef colors_out[4])
1013 {
1014 const int dims = texture_dims(bld->static_state->target);
1015 LLVMValueRef x, y, z;
1016
1017 /*
1018 * Compute integer texcoords.
1019 */
1020 x = lp_build_sample_wrap_nearest(bld, s, width_vec,
1021 bld->static_state->pot_width,
1022 bld->static_state->wrap_s);
1023 lp_build_name(x, "tex.x.wrapped");
1024
1025 if (dims >= 2) {
1026 y = lp_build_sample_wrap_nearest(bld, t, height_vec,
1027 bld->static_state->pot_height,
1028 bld->static_state->wrap_t);
1029 lp_build_name(y, "tex.y.wrapped");
1030
1031 if (dims == 3) {
1032 z = lp_build_sample_wrap_nearest(bld, r, depth_vec,
1033 bld->static_state->pot_height,
1034 bld->static_state->wrap_r);
1035 lp_build_name(z, "tex.z.wrapped");
1036 }
1037 else if (bld->static_state->target == PIPE_TEXTURE_CUBE) {
1038 z = r;
1039 }
1040 else {
1041 z = NULL;
1042 }
1043 }
1044 else {
1045 y = z = NULL;
1046 }
1047
1048 /*
1049 * Get texture colors.
1050 */
1051 lp_build_sample_texel_soa(bld, width_vec, height_vec, depth_vec,
1052 x, y, z,
1053 row_stride_vec, img_stride_vec,
1054 data_ptr, colors_out);
1055 }
1056
1057
1058 /**
1059 * Generate code to sample a mipmap level with linear filtering.
1060 * If sampling a cube texture, r = cube face in [0,5].
1061 */
1062 static void
1063 lp_build_sample_image_linear(struct lp_build_sample_context *bld,
1064 LLVMValueRef width_vec,
1065 LLVMValueRef height_vec,
1066 LLVMValueRef depth_vec,
1067 LLVMValueRef row_stride_vec,
1068 LLVMValueRef img_stride_vec,
1069 LLVMValueRef data_ptr,
1070 LLVMValueRef s,
1071 LLVMValueRef t,
1072 LLVMValueRef r,
1073 LLVMValueRef colors_out[4])
1074 {
1075 const int dims = texture_dims(bld->static_state->target);
1076 LLVMValueRef x0, y0, z0, x1, y1, z1;
1077 LLVMValueRef s_fpart, t_fpart, r_fpart;
1078 LLVMValueRef neighbors[2][2][4];
1079 int chan;
1080
1081 /*
1082 * Compute integer texcoords.
1083 */
1084 lp_build_sample_wrap_linear(bld, s, width_vec,
1085 bld->static_state->pot_width,
1086 bld->static_state->wrap_s,
1087 &x0, &x1, &s_fpart);
1088 lp_build_name(x0, "tex.x0.wrapped");
1089 lp_build_name(x1, "tex.x1.wrapped");
1090
1091 if (dims >= 2) {
1092 lp_build_sample_wrap_linear(bld, t, height_vec,
1093 bld->static_state->pot_height,
1094 bld->static_state->wrap_t,
1095 &y0, &y1, &t_fpart);
1096 lp_build_name(y0, "tex.y0.wrapped");
1097 lp_build_name(y1, "tex.y1.wrapped");
1098
1099 if (dims == 3) {
1100 lp_build_sample_wrap_linear(bld, r, depth_vec,
1101 bld->static_state->pot_depth,
1102 bld->static_state->wrap_r,
1103 &z0, &z1, &r_fpart);
1104 lp_build_name(z0, "tex.z0.wrapped");
1105 lp_build_name(z1, "tex.z1.wrapped");
1106 }
1107 else if (bld->static_state->target == PIPE_TEXTURE_CUBE) {
1108 z0 = z1 = r; /* cube face */
1109 r_fpart = NULL;
1110 }
1111 else {
1112 z0 = z1 = NULL;
1113 r_fpart = NULL;
1114 }
1115 }
1116 else {
1117 y0 = y1 = t_fpart = NULL;
1118 z0 = z1 = r_fpart = NULL;
1119 }
1120
1121 /*
1122 * Get texture colors.
1123 */
1124 /* get x0/x1 texels */
1125 lp_build_sample_texel_soa(bld, width_vec, height_vec, depth_vec,
1126 x0, y0, z0,
1127 row_stride_vec, img_stride_vec,
1128 data_ptr, neighbors[0][0]);
1129 lp_build_sample_texel_soa(bld, width_vec, height_vec, depth_vec,
1130 x1, y0, z0,
1131 row_stride_vec, img_stride_vec,
1132 data_ptr, neighbors[0][1]);
1133
1134 if (dims == 1) {
1135 /* Interpolate two samples from 1D image to produce one color */
1136 for (chan = 0; chan < 4; chan++) {
1137 colors_out[chan] = lp_build_lerp(&bld->texel_bld, s_fpart,
1138 neighbors[0][0][chan],
1139 neighbors[0][1][chan]);
1140 }
1141 }
1142 else {
1143 /* 2D/3D texture */
1144 LLVMValueRef colors0[4];
1145
1146 /* get x0/x1 texels at y1 */
1147 lp_build_sample_texel_soa(bld, width_vec, height_vec, depth_vec,
1148 x0, y1, z0,
1149 row_stride_vec, img_stride_vec,
1150 data_ptr, neighbors[1][0]);
1151 lp_build_sample_texel_soa(bld, width_vec, height_vec, depth_vec,
1152 x1, y1, z0,
1153 row_stride_vec, img_stride_vec,
1154 data_ptr, neighbors[1][1]);
1155
1156 /* Bilinear interpolate the four samples from the 2D image / 3D slice */
1157 for (chan = 0; chan < 4; chan++) {
1158 colors0[chan] = lp_build_lerp_2d(&bld->texel_bld,
1159 s_fpart, t_fpart,
1160 neighbors[0][0][chan],
1161 neighbors[0][1][chan],
1162 neighbors[1][0][chan],
1163 neighbors[1][1][chan]);
1164 }
1165
1166 if (dims == 3) {
1167 LLVMValueRef neighbors1[2][2][4];
1168 LLVMValueRef colors1[4];
1169
1170 /* get x0/x1/y0/y1 texels at z1 */
1171 lp_build_sample_texel_soa(bld, width_vec, height_vec, depth_vec,
1172 x0, y0, z1,
1173 row_stride_vec, img_stride_vec,
1174 data_ptr, neighbors1[0][0]);
1175 lp_build_sample_texel_soa(bld, width_vec, height_vec, depth_vec,
1176 x1, y0, z1,
1177 row_stride_vec, img_stride_vec,
1178 data_ptr, neighbors1[0][1]);
1179 lp_build_sample_texel_soa(bld, width_vec, height_vec, depth_vec,
1180 x0, y1, z1,
1181 row_stride_vec, img_stride_vec,
1182 data_ptr, neighbors1[1][0]);
1183 lp_build_sample_texel_soa(bld, width_vec, height_vec, depth_vec,
1184 x1, y1, z1,
1185 row_stride_vec, img_stride_vec,
1186 data_ptr, neighbors1[1][1]);
1187
1188 /* Bilinear interpolate the four samples from the second Z slice */
1189 for (chan = 0; chan < 4; chan++) {
1190 colors1[chan] = lp_build_lerp_2d(&bld->texel_bld,
1191 s_fpart, t_fpart,
1192 neighbors1[0][0][chan],
1193 neighbors1[0][1][chan],
1194 neighbors1[1][0][chan],
1195 neighbors1[1][1][chan]);
1196 }
1197
1198 /* Linearly interpolate the two samples from the two 3D slices */
1199 for (chan = 0; chan < 4; chan++) {
1200 colors_out[chan] = lp_build_lerp(&bld->texel_bld,
1201 r_fpart,
1202 colors0[chan], colors1[chan]);
1203 }
1204 }
1205 else {
1206 /* 2D tex */
1207 for (chan = 0; chan < 4; chan++) {
1208 colors_out[chan] = colors0[chan];
1209 }
1210 }
1211 }
1212 }
1213
1214
1215 /** Helper used by lp_build_cube_lookup() */
1216 static LLVMValueRef
1217 lp_build_cube_ima(struct lp_build_context *coord_bld, LLVMValueRef coord)
1218 {
1219 /* ima = -0.5 / abs(coord); */
1220 LLVMValueRef negHalf = lp_build_const_vec(coord_bld->type, -0.5);
1221 LLVMValueRef absCoord = lp_build_abs(coord_bld, coord);
1222 LLVMValueRef ima = lp_build_div(coord_bld, negHalf, absCoord);
1223 return ima;
1224 }
1225
1226
1227 /**
1228 * Helper used by lp_build_cube_lookup()
1229 * \param sign scalar +1 or -1
1230 * \param coord float vector
1231 * \param ima float vector
1232 */
1233 static LLVMValueRef
1234 lp_build_cube_coord(struct lp_build_context *coord_bld,
1235 LLVMValueRef sign, int negate_coord,
1236 LLVMValueRef coord, LLVMValueRef ima)
1237 {
1238 /* return negate(coord) * ima * sign + 0.5; */
1239 LLVMValueRef half = lp_build_const_vec(coord_bld->type, 0.5);
1240 LLVMValueRef res;
1241
1242 assert(negate_coord == +1 || negate_coord == -1);
1243
1244 if (negate_coord == -1) {
1245 coord = lp_build_negate(coord_bld, coord);
1246 }
1247
1248 res = lp_build_mul(coord_bld, coord, ima);
1249 if (sign) {
1250 sign = lp_build_broadcast_scalar(coord_bld, sign);
1251 res = lp_build_mul(coord_bld, res, sign);
1252 }
1253 res = lp_build_add(coord_bld, res, half);
1254
1255 return res;
1256 }
1257
1258
1259 /** Helper used by lp_build_cube_lookup()
1260 * Return (major_coord >= 0) ? pos_face : neg_face;
1261 */
1262 static LLVMValueRef
1263 lp_build_cube_face(struct lp_build_sample_context *bld,
1264 LLVMValueRef major_coord,
1265 unsigned pos_face, unsigned neg_face)
1266 {
1267 LLVMValueRef cmp = LLVMBuildFCmp(bld->builder, LLVMRealUGE,
1268 major_coord,
1269 bld->float_bld.zero, "");
1270 LLVMValueRef pos = LLVMConstInt(LLVMInt32Type(), pos_face, 0);
1271 LLVMValueRef neg = LLVMConstInt(LLVMInt32Type(), neg_face, 0);
1272 LLVMValueRef res = LLVMBuildSelect(bld->builder, cmp, pos, neg, "");
1273 return res;
1274 }
1275
1276
1277
1278 /**
1279 * Generate code to do cube face selection and compute per-face texcoords.
1280 */
1281 static void
1282 lp_build_cube_lookup(struct lp_build_sample_context *bld,
1283 LLVMValueRef s,
1284 LLVMValueRef t,
1285 LLVMValueRef r,
1286 LLVMValueRef *face,
1287 LLVMValueRef *face_s,
1288 LLVMValueRef *face_t)
1289 {
1290 struct lp_build_context *float_bld = &bld->float_bld;
1291 struct lp_build_context *coord_bld = &bld->coord_bld;
1292 LLVMValueRef rx, ry, rz;
1293 LLVMValueRef arx, ary, arz;
1294 LLVMValueRef c25 = LLVMConstReal(LLVMFloatType(), 0.25);
1295 LLVMValueRef arx_ge_ary, arx_ge_arz;
1296 LLVMValueRef ary_ge_arx, ary_ge_arz;
1297 LLVMValueRef arx_ge_ary_arz, ary_ge_arx_arz;
1298 LLVMValueRef rx_pos, ry_pos, rz_pos;
1299
1300 assert(bld->coord_bld.type.length == 4);
1301
1302 /*
1303 * Use the average of the four pixel's texcoords to choose the face.
1304 */
1305 rx = lp_build_mul(float_bld, c25,
1306 lp_build_sum_vector(&bld->coord_bld, s));
1307 ry = lp_build_mul(float_bld, c25,
1308 lp_build_sum_vector(&bld->coord_bld, t));
1309 rz = lp_build_mul(float_bld, c25,
1310 lp_build_sum_vector(&bld->coord_bld, r));
1311
1312 arx = lp_build_abs(float_bld, rx);
1313 ary = lp_build_abs(float_bld, ry);
1314 arz = lp_build_abs(float_bld, rz);
1315
1316 /*
1317 * Compare sign/magnitude of rx,ry,rz to determine face
1318 */
1319 arx_ge_ary = LLVMBuildFCmp(bld->builder, LLVMRealUGE, arx, ary, "");
1320 arx_ge_arz = LLVMBuildFCmp(bld->builder, LLVMRealUGE, arx, arz, "");
1321 ary_ge_arx = LLVMBuildFCmp(bld->builder, LLVMRealUGE, ary, arx, "");
1322 ary_ge_arz = LLVMBuildFCmp(bld->builder, LLVMRealUGE, ary, arz, "");
1323
1324 arx_ge_ary_arz = LLVMBuildAnd(bld->builder, arx_ge_ary, arx_ge_arz, "");
1325 ary_ge_arx_arz = LLVMBuildAnd(bld->builder, ary_ge_arx, ary_ge_arz, "");
1326
1327 rx_pos = LLVMBuildFCmp(bld->builder, LLVMRealUGE, rx, float_bld->zero, "");
1328 ry_pos = LLVMBuildFCmp(bld->builder, LLVMRealUGE, ry, float_bld->zero, "");
1329 rz_pos = LLVMBuildFCmp(bld->builder, LLVMRealUGE, rz, float_bld->zero, "");
1330
1331 {
1332 struct lp_build_flow_context *flow_ctx;
1333 struct lp_build_if_state if_ctx;
1334
1335 flow_ctx = lp_build_flow_create(bld->builder);
1336 lp_build_flow_scope_begin(flow_ctx);
1337
1338 *face_s = bld->coord_bld.undef;
1339 *face_t = bld->coord_bld.undef;
1340 *face = bld->int_bld.undef;
1341
1342 lp_build_name(*face_s, "face_s");
1343 lp_build_name(*face_t, "face_t");
1344 lp_build_name(*face, "face");
1345
1346 lp_build_flow_scope_declare(flow_ctx, face_s);
1347 lp_build_flow_scope_declare(flow_ctx, face_t);
1348 lp_build_flow_scope_declare(flow_ctx, face);
1349
1350 lp_build_if(&if_ctx, flow_ctx, bld->builder, arx_ge_ary_arz);
1351 {
1352 /* +/- X face */
1353 LLVMValueRef sign = lp_build_sgn(float_bld, rx);
1354 LLVMValueRef ima = lp_build_cube_ima(coord_bld, s);
1355 *face_s = lp_build_cube_coord(coord_bld, sign, +1, r, ima);
1356 *face_t = lp_build_cube_coord(coord_bld, NULL, +1, t, ima);
1357 *face = lp_build_cube_face(bld, rx,
1358 PIPE_TEX_FACE_POS_X,
1359 PIPE_TEX_FACE_NEG_X);
1360 }
1361 lp_build_else(&if_ctx);
1362 {
1363 struct lp_build_flow_context *flow_ctx2;
1364 struct lp_build_if_state if_ctx2;
1365
1366 LLVMValueRef face_s2 = bld->coord_bld.undef;
1367 LLVMValueRef face_t2 = bld->coord_bld.undef;
1368 LLVMValueRef face2 = bld->int_bld.undef;
1369
1370 flow_ctx2 = lp_build_flow_create(bld->builder);
1371 lp_build_flow_scope_begin(flow_ctx2);
1372 lp_build_flow_scope_declare(flow_ctx2, &face_s2);
1373 lp_build_flow_scope_declare(flow_ctx2, &face_t2);
1374 lp_build_flow_scope_declare(flow_ctx2, &face2);
1375
1376 ary_ge_arx_arz = LLVMBuildAnd(bld->builder, ary_ge_arx, ary_ge_arz, "");
1377
1378 lp_build_if(&if_ctx2, flow_ctx2, bld->builder, ary_ge_arx_arz);
1379 {
1380 /* +/- Y face */
1381 LLVMValueRef sign = lp_build_sgn(float_bld, ry);
1382 LLVMValueRef ima = lp_build_cube_ima(coord_bld, t);
1383 face_s2 = lp_build_cube_coord(coord_bld, NULL, -1, s, ima);
1384 face_t2 = lp_build_cube_coord(coord_bld, sign, -1, r, ima);
1385 face2 = lp_build_cube_face(bld, ry,
1386 PIPE_TEX_FACE_POS_Y,
1387 PIPE_TEX_FACE_NEG_Y);
1388 }
1389 lp_build_else(&if_ctx2);
1390 {
1391 /* +/- Z face */
1392 LLVMValueRef sign = lp_build_sgn(float_bld, rz);
1393 LLVMValueRef ima = lp_build_cube_ima(coord_bld, r);
1394 face_s2 = lp_build_cube_coord(coord_bld, sign, -1, s, ima);
1395 face_t2 = lp_build_cube_coord(coord_bld, NULL, +1, t, ima);
1396 face2 = lp_build_cube_face(bld, rz,
1397 PIPE_TEX_FACE_POS_Z,
1398 PIPE_TEX_FACE_NEG_Z);
1399 }
1400 lp_build_endif(&if_ctx2);
1401 lp_build_flow_scope_end(flow_ctx2);
1402 lp_build_flow_destroy(flow_ctx2);
1403 *face_s = face_s2;
1404 *face_t = face_t2;
1405 *face = face2;
1406 }
1407
1408 lp_build_endif(&if_ctx);
1409 lp_build_flow_scope_end(flow_ctx);
1410 lp_build_flow_destroy(flow_ctx);
1411 }
1412 }
1413
1414
1415
1416 /**
1417 * Sample the texture/mipmap using given image filter and mip filter.
1418 * data0_ptr and data1_ptr point to the two mipmap levels to sample
1419 * from. width0/1_vec, height0/1_vec, depth0/1_vec indicate their sizes.
1420 * If we're using nearest miplevel sampling the '1' values will be null/unused.
1421 */
1422 static void
1423 lp_build_sample_mipmap(struct lp_build_sample_context *bld,
1424 unsigned img_filter,
1425 unsigned mip_filter,
1426 LLVMValueRef s,
1427 LLVMValueRef t,
1428 LLVMValueRef r,
1429 LLVMValueRef lod_fpart,
1430 LLVMValueRef width0_vec,
1431 LLVMValueRef width1_vec,
1432 LLVMValueRef height0_vec,
1433 LLVMValueRef height1_vec,
1434 LLVMValueRef depth0_vec,
1435 LLVMValueRef depth1_vec,
1436 LLVMValueRef row_stride0_vec,
1437 LLVMValueRef row_stride1_vec,
1438 LLVMValueRef img_stride0_vec,
1439 LLVMValueRef img_stride1_vec,
1440 LLVMValueRef data_ptr0,
1441 LLVMValueRef data_ptr1,
1442 LLVMValueRef *colors_out)
1443 {
1444 LLVMValueRef colors0[4], colors1[4];
1445 int chan;
1446
1447 if (img_filter == PIPE_TEX_FILTER_NEAREST) {
1448 /* sample the first mipmap level */
1449 lp_build_sample_image_nearest(bld,
1450 width0_vec, height0_vec, depth0_vec,
1451 row_stride0_vec, img_stride0_vec,
1452 data_ptr0, s, t, r, colors0);
1453
1454 if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR) {
1455 /* sample the second mipmap level */
1456 lp_build_sample_image_nearest(bld,
1457 width1_vec, height1_vec, depth1_vec,
1458 row_stride1_vec, img_stride1_vec,
1459 data_ptr1, s, t, r, colors1);
1460 }
1461 }
1462 else {
1463 assert(img_filter == PIPE_TEX_FILTER_LINEAR);
1464
1465 /* sample the first mipmap level */
1466 lp_build_sample_image_linear(bld,
1467 width0_vec, height0_vec, depth0_vec,
1468 row_stride0_vec, img_stride0_vec,
1469 data_ptr0, s, t, r, colors0);
1470
1471 if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR) {
1472 /* sample the second mipmap level */
1473 lp_build_sample_image_linear(bld,
1474 width1_vec, height1_vec, depth1_vec,
1475 row_stride1_vec, img_stride1_vec,
1476 data_ptr1, s, t, r, colors1);
1477 }
1478 }
1479
1480 if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR) {
1481 /* interpolate samples from the two mipmap levels */
1482 for (chan = 0; chan < 4; chan++) {
1483 colors_out[chan] = lp_build_lerp(&bld->texel_bld, lod_fpart,
1484 colors0[chan], colors1[chan]);
1485 }
1486 }
1487 else {
1488 /* use first/only level's colors */
1489 for (chan = 0; chan < 4; chan++) {
1490 colors_out[chan] = colors0[chan];
1491 }
1492 }
1493 }
1494
1495
1496
1497 /**
1498 * General texture sampling codegen.
1499 * This function handles texture sampling for all texture targets (1D,
1500 * 2D, 3D, cube) and all filtering modes.
1501 */
1502 static void
1503 lp_build_sample_general(struct lp_build_sample_context *bld,
1504 unsigned unit,
1505 LLVMValueRef s,
1506 LLVMValueRef t,
1507 LLVMValueRef r,
1508 const LLVMValueRef *ddx,
1509 const LLVMValueRef *ddy,
1510 LLVMValueRef lod_bias, /* optional */
1511 LLVMValueRef explicit_lod, /* optional */
1512 LLVMValueRef width,
1513 LLVMValueRef height,
1514 LLVMValueRef depth,
1515 LLVMValueRef width_vec,
1516 LLVMValueRef height_vec,
1517 LLVMValueRef depth_vec,
1518 LLVMValueRef row_stride_array,
1519 LLVMValueRef img_stride_array,
1520 LLVMValueRef data_array,
1521 LLVMValueRef *colors_out)
1522 {
1523 struct lp_build_context *float_bld = &bld->float_bld;
1524 const unsigned mip_filter = bld->static_state->min_mip_filter;
1525 const unsigned min_filter = bld->static_state->min_img_filter;
1526 const unsigned mag_filter = bld->static_state->mag_img_filter;
1527 const int dims = texture_dims(bld->static_state->target);
1528 LLVMValueRef lod = NULL, lod_fpart = NULL;
1529 LLVMValueRef ilevel0, ilevel1 = NULL, ilevel0_vec, ilevel1_vec = NULL;
1530 LLVMValueRef width0_vec = NULL, height0_vec = NULL, depth0_vec = NULL;
1531 LLVMValueRef width1_vec = NULL, height1_vec = NULL, depth1_vec = NULL;
1532 LLVMValueRef row_stride0_vec = NULL, row_stride1_vec = NULL;
1533 LLVMValueRef img_stride0_vec = NULL, img_stride1_vec = NULL;
1534 LLVMValueRef data_ptr0, data_ptr1 = NULL;
1535 LLVMValueRef face_ddx[4], face_ddy[4];
1536
1537 /*
1538 printf("%s mip %d min %d mag %d\n", __FUNCTION__,
1539 mip_filter, min_filter, mag_filter);
1540 */
1541
1542 /*
1543 * Choose cube face, recompute texcoords and derivatives for the chosen face.
1544 */
1545 if (bld->static_state->target == PIPE_TEXTURE_CUBE) {
1546 LLVMValueRef face, face_s, face_t;
1547 lp_build_cube_lookup(bld, s, t, r, &face, &face_s, &face_t);
1548 s = face_s; /* vec */
1549 t = face_t; /* vec */
1550 /* use 'r' to indicate cube face */
1551 r = lp_build_broadcast_scalar(&bld->int_coord_bld, face); /* vec */
1552
1553 /* recompute ddx, ddy using the new (s,t) face texcoords */
1554 face_ddx[0] = lp_build_ddx(&bld->coord_bld, s);
1555 face_ddx[1] = lp_build_ddx(&bld->coord_bld, t);
1556 face_ddx[2] = NULL;
1557 face_ddx[3] = NULL;
1558 face_ddy[0] = lp_build_ddy(&bld->coord_bld, s);
1559 face_ddy[1] = lp_build_ddy(&bld->coord_bld, t);
1560 face_ddy[2] = NULL;
1561 face_ddy[3] = NULL;
1562 ddx = face_ddx;
1563 ddy = face_ddy;
1564 }
1565
1566 /*
1567 * Compute the level of detail (float).
1568 */
1569 if (min_filter != mag_filter ||
1570 mip_filter != PIPE_TEX_MIPFILTER_NONE) {
1571 /* Need to compute lod either to choose mipmap levels or to
1572 * distinguish between minification/magnification with one mipmap level.
1573 */
1574 lod = lp_build_lod_selector(bld, ddx, ddy,
1575 lod_bias, explicit_lod,
1576 width, height, depth);
1577 }
1578
1579 /*
1580 * Compute integer mipmap level(s) to fetch texels from.
1581 */
1582 if (mip_filter == PIPE_TEX_MIPFILTER_NONE) {
1583 /* always use mip level 0 */
1584 if (bld->static_state->target == PIPE_TEXTURE_CUBE) {
1585 /* XXX this is a work-around for an apparent bug in LLVM 2.7.
1586 * We should be able to set ilevel0 = const(0) but that causes
1587 * bad x86 code to be emitted.
1588 */
1589 lod = lp_build_const_elem(bld->coord_bld.type, 0.0);
1590 lp_build_nearest_mip_level(bld, unit, lod, &ilevel0);
1591 }
1592 else {
1593 ilevel0 = LLVMConstInt(LLVMInt32Type(), 0, 0);
1594 }
1595 }
1596 else {
1597 assert(lod);
1598 if (mip_filter == PIPE_TEX_MIPFILTER_NEAREST) {
1599 lp_build_nearest_mip_level(bld, unit, lod, &ilevel0);
1600 }
1601 else {
1602 assert(mip_filter == PIPE_TEX_MIPFILTER_LINEAR);
1603 lp_build_linear_mip_levels(bld, unit, lod, &ilevel0, &ilevel1,
1604 &lod_fpart);
1605 lod_fpart = lp_build_broadcast_scalar(&bld->coord_bld, lod_fpart);
1606 }
1607 }
1608
1609 /*
1610 * Convert scalar integer mipmap levels into vectors.
1611 */
1612 ilevel0_vec = lp_build_broadcast_scalar(&bld->int_coord_bld, ilevel0);
1613 if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR)
1614 ilevel1_vec = lp_build_broadcast_scalar(&bld->int_coord_bld, ilevel1);
1615
1616 /*
1617 * Compute width, height at mipmap level 'ilevel0'
1618 */
1619 width0_vec = lp_build_minify(bld, width_vec, ilevel0_vec);
1620 if (dims >= 2) {
1621 height0_vec = lp_build_minify(bld, height_vec, ilevel0_vec);
1622 row_stride0_vec = lp_build_get_level_stride_vec(bld, row_stride_array,
1623 ilevel0);
1624 if (dims == 3 || bld->static_state->target == PIPE_TEXTURE_CUBE) {
1625 img_stride0_vec = lp_build_get_level_stride_vec(bld,
1626 img_stride_array,
1627 ilevel0);
1628 if (dims == 3) {
1629 depth0_vec = lp_build_minify(bld, depth_vec, ilevel0_vec);
1630 }
1631 }
1632 }
1633 if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR) {
1634 /* compute width, height, depth for second mipmap level at 'ilevel1' */
1635 width1_vec = lp_build_minify(bld, width_vec, ilevel1_vec);
1636 if (dims >= 2) {
1637 height1_vec = lp_build_minify(bld, height_vec, ilevel1_vec);
1638 row_stride1_vec = lp_build_get_level_stride_vec(bld, row_stride_array,
1639 ilevel1);
1640 if (dims == 3 || bld->static_state->target == PIPE_TEXTURE_CUBE) {
1641 img_stride1_vec = lp_build_get_level_stride_vec(bld,
1642 img_stride_array,
1643 ilevel1);
1644 if (dims ==3) {
1645 depth1_vec = lp_build_minify(bld, depth_vec, ilevel1_vec);
1646 }
1647 }
1648 }
1649 }
1650
1651 /*
1652 * Get pointer(s) to image data for mipmap level(s).
1653 */
1654 data_ptr0 = lp_build_get_mipmap_level(bld, data_array, ilevel0);
1655 if (mip_filter == PIPE_TEX_MIPFILTER_LINEAR) {
1656 data_ptr1 = lp_build_get_mipmap_level(bld, data_array, ilevel1);
1657 }
1658
1659 /*
1660 * Get/interpolate texture colors.
1661 */
1662 if (min_filter == mag_filter) {
1663 /* no need to distinquish between minification and magnification */
1664 lp_build_sample_mipmap(bld, min_filter, mip_filter, s, t, r, lod_fpart,
1665 width0_vec, width1_vec,
1666 height0_vec, height1_vec,
1667 depth0_vec, depth1_vec,
1668 row_stride0_vec, row_stride1_vec,
1669 img_stride0_vec, img_stride1_vec,
1670 data_ptr0, data_ptr1,
1671 colors_out);
1672 }
1673 else {
1674 /* Emit conditional to choose min image filter or mag image filter
1675 * depending on the lod being >0 or <= 0, respectively.
1676 */
1677 struct lp_build_flow_context *flow_ctx;
1678 struct lp_build_if_state if_ctx;
1679 LLVMValueRef minify;
1680
1681 flow_ctx = lp_build_flow_create(bld->builder);
1682 lp_build_flow_scope_begin(flow_ctx);
1683
1684 lp_build_flow_scope_declare(flow_ctx, &colors_out[0]);
1685 lp_build_flow_scope_declare(flow_ctx, &colors_out[1]);
1686 lp_build_flow_scope_declare(flow_ctx, &colors_out[2]);
1687 lp_build_flow_scope_declare(flow_ctx, &colors_out[3]);
1688
1689 /* minify = lod > 0.0 */
1690 minify = LLVMBuildFCmp(bld->builder, LLVMRealUGE,
1691 lod, float_bld->zero, "");
1692
1693 lp_build_if(&if_ctx, flow_ctx, bld->builder, minify);
1694 {
1695 /* Use the minification filter */
1696 lp_build_sample_mipmap(bld, min_filter, mip_filter,
1697 s, t, r, lod_fpart,
1698 width0_vec, width1_vec,
1699 height0_vec, height1_vec,
1700 depth0_vec, depth1_vec,
1701 row_stride0_vec, row_stride1_vec,
1702 img_stride0_vec, img_stride1_vec,
1703 data_ptr0, data_ptr1,
1704 colors_out);
1705 }
1706 lp_build_else(&if_ctx);
1707 {
1708 /* Use the magnification filter */
1709 lp_build_sample_mipmap(bld, mag_filter, mip_filter,
1710 s, t, r, lod_fpart,
1711 width0_vec, width1_vec,
1712 height0_vec, height1_vec,
1713 depth0_vec, depth1_vec,
1714 row_stride0_vec, row_stride1_vec,
1715 img_stride0_vec, img_stride1_vec,
1716 data_ptr0, data_ptr1,
1717 colors_out);
1718 }
1719 lp_build_endif(&if_ctx);
1720
1721 lp_build_flow_scope_end(flow_ctx);
1722 lp_build_flow_destroy(flow_ctx);
1723 }
1724 }
1725
1726
1727
1728 static void
1729 lp_build_sample_2d_linear_aos(struct lp_build_sample_context *bld,
1730 LLVMValueRef s,
1731 LLVMValueRef t,
1732 LLVMValueRef width,
1733 LLVMValueRef height,
1734 LLVMValueRef stride_array,
1735 LLVMValueRef data_array,
1736 LLVMValueRef texel_out[4])
1737 {
1738 LLVMBuilderRef builder = bld->builder;
1739 struct lp_build_context i32, h16, u8n;
1740 LLVMTypeRef i32_vec_type, h16_vec_type, u8n_vec_type;
1741 LLVMValueRef i32_c8, i32_c128, i32_c255;
1742 LLVMValueRef s_ipart, s_fpart, s_fpart_lo, s_fpart_hi;
1743 LLVMValueRef t_ipart, t_fpart, t_fpart_lo, t_fpart_hi;
1744 LLVMValueRef x0, x1;
1745 LLVMValueRef y0, y1;
1746 LLVMValueRef neighbors[2][2];
1747 LLVMValueRef neighbors_lo[2][2];
1748 LLVMValueRef neighbors_hi[2][2];
1749 LLVMValueRef packed, packed_lo, packed_hi;
1750 LLVMValueRef unswizzled[4];
1751 LLVMValueRef stride;
1752
1753 assert(bld->static_state->target == PIPE_TEXTURE_2D);
1754 assert(bld->static_state->min_img_filter == PIPE_TEX_FILTER_LINEAR);
1755 assert(bld->static_state->mag_img_filter == PIPE_TEX_FILTER_LINEAR);
1756 assert(bld->static_state->min_mip_filter == PIPE_TEX_MIPFILTER_NONE);
1757
1758 lp_build_context_init(&i32, builder, lp_type_int_vec(32));
1759 lp_build_context_init(&h16, builder, lp_type_ufixed(16));
1760 lp_build_context_init(&u8n, builder, lp_type_unorm(8));
1761
1762 i32_vec_type = lp_build_vec_type(i32.type);
1763 h16_vec_type = lp_build_vec_type(h16.type);
1764 u8n_vec_type = lp_build_vec_type(u8n.type);
1765
1766 if (bld->static_state->normalized_coords) {
1767 LLVMTypeRef coord_vec_type = lp_build_vec_type(bld->coord_type);
1768 LLVMValueRef fp_width = LLVMBuildSIToFP(bld->builder, width, coord_vec_type, "");
1769 LLVMValueRef fp_height = LLVMBuildSIToFP(bld->builder, height, coord_vec_type, "");
1770 s = lp_build_mul(&bld->coord_bld, s, fp_width);
1771 t = lp_build_mul(&bld->coord_bld, t, fp_height);
1772 }
1773
1774 /* scale coords by 256 (8 fractional bits) */
1775 s = lp_build_mul_imm(&bld->coord_bld, s, 256);
1776 t = lp_build_mul_imm(&bld->coord_bld, t, 256);
1777
1778 /* convert float to int */
1779 s = LLVMBuildFPToSI(builder, s, i32_vec_type, "");
1780 t = LLVMBuildFPToSI(builder, t, i32_vec_type, "");
1781
1782 /* subtract 0.5 (add -128) */
1783 i32_c128 = lp_build_const_int_vec(i32.type, -128);
1784 s = LLVMBuildAdd(builder, s, i32_c128, "");
1785 t = LLVMBuildAdd(builder, t, i32_c128, "");
1786
1787 /* compute floor (shift right 8) */
1788 i32_c8 = lp_build_const_int_vec(i32.type, 8);
1789 s_ipart = LLVMBuildAShr(builder, s, i32_c8, "");
1790 t_ipart = LLVMBuildAShr(builder, t, i32_c8, "");
1791
1792 /* compute fractional part (AND with 0xff) */
1793 i32_c255 = lp_build_const_int_vec(i32.type, 255);
1794 s_fpart = LLVMBuildAnd(builder, s, i32_c255, "");
1795 t_fpart = LLVMBuildAnd(builder, t, i32_c255, "");
1796
1797 x0 = s_ipart;
1798 y0 = t_ipart;
1799
1800 x1 = lp_build_add(&bld->int_coord_bld, x0, bld->int_coord_bld.one);
1801 y1 = lp_build_add(&bld->int_coord_bld, y0, bld->int_coord_bld.one);
1802
1803 x0 = lp_build_sample_wrap_int(bld, x0, width, bld->static_state->pot_width,
1804 bld->static_state->wrap_s);
1805 y0 = lp_build_sample_wrap_int(bld, y0, height, bld->static_state->pot_height,
1806 bld->static_state->wrap_t);
1807
1808 x1 = lp_build_sample_wrap_int(bld, x1, width, bld->static_state->pot_width,
1809 bld->static_state->wrap_s);
1810 y1 = lp_build_sample_wrap_int(bld, y1, height, bld->static_state->pot_height,
1811 bld->static_state->wrap_t);
1812
1813 /*
1814 * Transform 4 x i32 in
1815 *
1816 * s_fpart = {s0, s1, s2, s3}
1817 *
1818 * into 8 x i16
1819 *
1820 * s_fpart = {00, s0, 00, s1, 00, s2, 00, s3}
1821 *
1822 * into two 8 x i16
1823 *
1824 * s_fpart_lo = {s0, s0, s0, s0, s1, s1, s1, s1}
1825 * s_fpart_hi = {s2, s2, s2, s2, s3, s3, s3, s3}
1826 *
1827 * and likewise for t_fpart. There is no risk of loosing precision here
1828 * since the fractional parts only use the lower 8bits.
1829 */
1830
1831 s_fpart = LLVMBuildBitCast(builder, s_fpart, h16_vec_type, "");
1832 t_fpart = LLVMBuildBitCast(builder, t_fpart, h16_vec_type, "");
1833
1834 {
1835 LLVMTypeRef elem_type = LLVMInt32Type();
1836 LLVMValueRef shuffles_lo[LP_MAX_VECTOR_LENGTH];
1837 LLVMValueRef shuffles_hi[LP_MAX_VECTOR_LENGTH];
1838 LLVMValueRef shuffle_lo;
1839 LLVMValueRef shuffle_hi;
1840 unsigned i, j;
1841
1842 for(j = 0; j < h16.type.length; j += 4) {
1843 unsigned subindex = util_cpu_caps.little_endian ? 0 : 1;
1844 LLVMValueRef index;
1845
1846 index = LLVMConstInt(elem_type, j/2 + subindex, 0);
1847 for(i = 0; i < 4; ++i)
1848 shuffles_lo[j + i] = index;
1849
1850 index = LLVMConstInt(elem_type, h16.type.length/2 + j/2 + subindex, 0);
1851 for(i = 0; i < 4; ++i)
1852 shuffles_hi[j + i] = index;
1853 }
1854
1855 shuffle_lo = LLVMConstVector(shuffles_lo, h16.type.length);
1856 shuffle_hi = LLVMConstVector(shuffles_hi, h16.type.length);
1857
1858 s_fpart_lo = LLVMBuildShuffleVector(builder, s_fpart, h16.undef, shuffle_lo, "");
1859 t_fpart_lo = LLVMBuildShuffleVector(builder, t_fpart, h16.undef, shuffle_lo, "");
1860 s_fpart_hi = LLVMBuildShuffleVector(builder, s_fpart, h16.undef, shuffle_hi, "");
1861 t_fpart_hi = LLVMBuildShuffleVector(builder, t_fpart, h16.undef, shuffle_hi, "");
1862 }
1863
1864 stride = lp_build_get_const_level_stride_vec(bld, stride_array, 0);
1865
1866 /*
1867 * Fetch the pixels as 4 x 32bit (rgba order might differ):
1868 *
1869 * rgba0 rgba1 rgba2 rgba3
1870 *
1871 * bit cast them into 16 x u8
1872 *
1873 * r0 g0 b0 a0 r1 g1 b1 a1 r2 g2 b2 a2 r3 g3 b3 a3
1874 *
1875 * unpack them into two 8 x i16:
1876 *
1877 * r0 g0 b0 a0 r1 g1 b1 a1
1878 * r2 g2 b2 a2 r3 g3 b3 a3
1879 *
1880 * The higher 8 bits of the resulting elements will be zero.
1881 */
1882
1883 neighbors[0][0] = lp_build_sample_packed(bld, x0, y0, stride, data_array);
1884 neighbors[0][1] = lp_build_sample_packed(bld, x1, y0, stride, data_array);
1885 neighbors[1][0] = lp_build_sample_packed(bld, x0, y1, stride, data_array);
1886 neighbors[1][1] = lp_build_sample_packed(bld, x1, y1, stride, data_array);
1887
1888 neighbors[0][0] = LLVMBuildBitCast(builder, neighbors[0][0], u8n_vec_type, "");
1889 neighbors[0][1] = LLVMBuildBitCast(builder, neighbors[0][1], u8n_vec_type, "");
1890 neighbors[1][0] = LLVMBuildBitCast(builder, neighbors[1][0], u8n_vec_type, "");
1891 neighbors[1][1] = LLVMBuildBitCast(builder, neighbors[1][1], u8n_vec_type, "");
1892
1893 lp_build_unpack2(builder, u8n.type, h16.type, neighbors[0][0], &neighbors_lo[0][0], &neighbors_hi[0][0]);
1894 lp_build_unpack2(builder, u8n.type, h16.type, neighbors[0][1], &neighbors_lo[0][1], &neighbors_hi[0][1]);
1895 lp_build_unpack2(builder, u8n.type, h16.type, neighbors[1][0], &neighbors_lo[1][0], &neighbors_hi[1][0]);
1896 lp_build_unpack2(builder, u8n.type, h16.type, neighbors[1][1], &neighbors_lo[1][1], &neighbors_hi[1][1]);
1897
1898 /*
1899 * Linear interpolate with 8.8 fixed point.
1900 */
1901
1902 packed_lo = lp_build_lerp_2d(&h16,
1903 s_fpart_lo, t_fpart_lo,
1904 neighbors_lo[0][0],
1905 neighbors_lo[0][1],
1906 neighbors_lo[1][0],
1907 neighbors_lo[1][1]);
1908
1909 packed_hi = lp_build_lerp_2d(&h16,
1910 s_fpart_hi, t_fpart_hi,
1911 neighbors_hi[0][0],
1912 neighbors_hi[0][1],
1913 neighbors_hi[1][0],
1914 neighbors_hi[1][1]);
1915
1916 packed = lp_build_pack2(builder, h16.type, u8n.type, packed_lo, packed_hi);
1917
1918 /*
1919 * Convert to SoA and swizzle.
1920 */
1921
1922 lp_build_rgba8_to_f32_soa(bld->builder,
1923 bld->texel_type,
1924 packed, unswizzled);
1925
1926 if (util_format_is_rgba8_variant(bld->format_desc)) {
1927 lp_build_format_swizzle_soa(bld->format_desc,
1928 &bld->texel_bld,
1929 unswizzled, texel_out);
1930 } else {
1931 texel_out[0] = unswizzled[0];
1932 texel_out[1] = unswizzled[1];
1933 texel_out[2] = unswizzled[2];
1934 texel_out[3] = unswizzled[3];
1935 }
1936
1937 apply_sampler_swizzle(bld, texel_out);
1938 }
1939
1940
1941 static void
1942 lp_build_sample_compare(struct lp_build_sample_context *bld,
1943 LLVMValueRef p,
1944 LLVMValueRef texel[4])
1945 {
1946 struct lp_build_context *texel_bld = &bld->texel_bld;
1947 LLVMValueRef res;
1948 unsigned chan;
1949
1950 if(bld->static_state->compare_mode == PIPE_TEX_COMPARE_NONE)
1951 return;
1952
1953 /* TODO: Compare before swizzling, to avoid redundant computations */
1954 res = NULL;
1955 for(chan = 0; chan < 4; ++chan) {
1956 LLVMValueRef cmp;
1957 cmp = lp_build_cmp(texel_bld, bld->static_state->compare_func, p, texel[chan]);
1958 cmp = lp_build_select(texel_bld, cmp, texel_bld->one, texel_bld->zero);
1959
1960 if(res)
1961 res = lp_build_add(texel_bld, res, cmp);
1962 else
1963 res = cmp;
1964 }
1965
1966 assert(res);
1967 res = lp_build_mul(texel_bld, res, lp_build_const_vec(texel_bld->type, 0.25));
1968
1969 /* XXX returning result for default GL_DEPTH_TEXTURE_MODE = GL_LUMINANCE */
1970 for(chan = 0; chan < 3; ++chan)
1971 texel[chan] = res;
1972 texel[3] = texel_bld->one;
1973 }
1974
1975
1976 /**
1977 * Just set texels to white instead of actually sampling the texture.
1978 * For debugging.
1979 */
1980 static void
1981 lp_build_sample_nop(struct lp_build_sample_context *bld,
1982 LLVMValueRef texel_out[4])
1983 {
1984 struct lp_build_context *texel_bld = &bld->texel_bld;
1985 unsigned chan;
1986
1987 for (chan = 0; chan < 4; chan++) {
1988 /*lp_bld_mov(texel_bld, texel, texel_bld->one);*/
1989 texel_out[chan] = texel_bld->one;
1990 }
1991 }
1992
1993
1994 /**
1995 * Build texture sampling code.
1996 * 'texel' will return a vector of four LLVMValueRefs corresponding to
1997 * R, G, B, A.
1998 * \param type vector float type to use for coords, etc.
1999 * \param ddx partial derivatives of (s,t,r,q) with respect to x
2000 * \param ddy partial derivatives of (s,t,r,q) with respect to y
2001 */
2002 void
2003 lp_build_sample_soa(LLVMBuilderRef builder,
2004 const struct lp_sampler_static_state *static_state,
2005 struct lp_sampler_dynamic_state *dynamic_state,
2006 struct lp_type type,
2007 unsigned unit,
2008 unsigned num_coords,
2009 const LLVMValueRef *coords,
2010 const LLVMValueRef ddx[4],
2011 const LLVMValueRef ddy[4],
2012 LLVMValueRef lod_bias, /* optional */
2013 LLVMValueRef explicit_lod, /* optional */
2014 LLVMValueRef texel_out[4])
2015 {
2016 struct lp_build_sample_context bld;
2017 LLVMValueRef width, width_vec;
2018 LLVMValueRef height, height_vec;
2019 LLVMValueRef depth, depth_vec;
2020 LLVMValueRef row_stride_array, img_stride_array;
2021 LLVMValueRef data_array;
2022 LLVMValueRef s;
2023 LLVMValueRef t;
2024 LLVMValueRef r;
2025
2026 if (0) {
2027 enum pipe_format fmt = static_state->format;
2028 debug_printf("Sample from %s\n", util_format_name(fmt));
2029 }
2030
2031 assert(type.floating);
2032
2033 /* Setup our build context */
2034 memset(&bld, 0, sizeof bld);
2035 bld.builder = builder;
2036 bld.static_state = static_state;
2037 bld.dynamic_state = dynamic_state;
2038 bld.format_desc = util_format_description(static_state->format);
2039
2040 bld.float_type = lp_type_float(32);
2041 bld.int_type = lp_type_int(32);
2042 bld.coord_type = type;
2043 bld.uint_coord_type = lp_uint_type(type);
2044 bld.int_coord_type = lp_int_type(type);
2045 bld.texel_type = type;
2046
2047 lp_build_context_init(&bld.float_bld, builder, bld.float_type);
2048 lp_build_context_init(&bld.int_bld, builder, bld.int_type);
2049 lp_build_context_init(&bld.coord_bld, builder, bld.coord_type);
2050 lp_build_context_init(&bld.uint_coord_bld, builder, bld.uint_coord_type);
2051 lp_build_context_init(&bld.int_coord_bld, builder, bld.int_coord_type);
2052 lp_build_context_init(&bld.texel_bld, builder, bld.texel_type);
2053
2054 /* Get the dynamic state */
2055 width = dynamic_state->width(dynamic_state, builder, unit);
2056 height = dynamic_state->height(dynamic_state, builder, unit);
2057 depth = dynamic_state->depth(dynamic_state, builder, unit);
2058 row_stride_array = dynamic_state->row_stride(dynamic_state, builder, unit);
2059 img_stride_array = dynamic_state->img_stride(dynamic_state, builder, unit);
2060 data_array = dynamic_state->data_ptr(dynamic_state, builder, unit);
2061 /* Note that data_array is an array[level] of pointers to texture images */
2062
2063 s = coords[0];
2064 t = coords[1];
2065 r = coords[2];
2066
2067 width_vec = lp_build_broadcast_scalar(&bld.uint_coord_bld, width);
2068 height_vec = lp_build_broadcast_scalar(&bld.uint_coord_bld, height);
2069 depth_vec = lp_build_broadcast_scalar(&bld.uint_coord_bld, depth);
2070
2071 if (0) {
2072 /* For debug: no-op texture sampling */
2073 lp_build_sample_nop(&bld, texel_out);
2074 }
2075 else if (util_format_fits_8unorm(bld.format_desc) &&
2076 bld.format_desc->nr_channels > 1 &&
2077 static_state->target == PIPE_TEXTURE_2D &&
2078 static_state->min_img_filter == PIPE_TEX_FILTER_LINEAR &&
2079 static_state->mag_img_filter == PIPE_TEX_FILTER_LINEAR &&
2080 static_state->min_mip_filter == PIPE_TEX_MIPFILTER_NONE &&
2081 is_simple_wrap_mode(static_state->wrap_s) &&
2082 is_simple_wrap_mode(static_state->wrap_t)) {
2083 /* special case */
2084 lp_build_sample_2d_linear_aos(&bld, s, t, width_vec, height_vec,
2085 row_stride_array, data_array, texel_out);
2086 }
2087 else {
2088 lp_build_sample_general(&bld, unit, s, t, r, ddx, ddy,
2089 lod_bias, explicit_lod,
2090 width, height, depth,
2091 width_vec, height_vec, depth_vec,
2092 row_stride_array, img_stride_array,
2093 data_array,
2094 texel_out);
2095 }
2096
2097 lp_build_sample_compare(&bld, r, texel_out);
2098 }