projects / mesa.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
gallivm: checkpoint: code gen for mipmap selection
[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 */
34
35 #include "pipe/p_defines.h"
36 #include "pipe/p_state.h"
37 #include "util/u_debug.h"
38 #include "util/u_dump.h"
39 #include "util/u_memory.h"
40 #include "util/u_math.h"
41 #include "util/u_format.h"
42 #include "util/u_cpu_detect.h"
43 #include "lp_bld_debug.h"
44 #include "lp_bld_type.h"
45 #include "lp_bld_const.h"
46 #include "lp_bld_conv.h"
47 #include "lp_bld_arit.h"
48 #include "lp_bld_logic.h"
49 #include "lp_bld_swizzle.h"
50 #include "lp_bld_pack.h"
51 #include "lp_bld_format.h"
52 #include "lp_bld_sample.h"
53
54
55 /**
56 * Keep all information for sampling code generation in a single place.
57 */
58 struct lp_build_sample_context
59 {
60 LLVMBuilderRef builder;
61
62 const struct lp_sampler_static_state *static_state;
63
64 struct lp_sampler_dynamic_state *dynamic_state;
65
66 const struct util_format_description *format_desc;
67
68 /** Incoming coordinates type and build context */
69 struct lp_type coord_type;
70 struct lp_build_context coord_bld;
71
72 /** Unsigned integer coordinates */
73 struct lp_type uint_coord_type;
74 struct lp_build_context uint_coord_bld;
75
76 /** Signed integer coordinates */
77 struct lp_type int_coord_type;
78 struct lp_build_context int_coord_bld;
79
80 /** Output texels type and build context */
81 struct lp_type texel_type;
82 struct lp_build_context texel_bld;
83 };
84
85
86 /**
87 * Does the given texture wrap mode allow sampling the texture border color?
88 * XXX maybe move this into gallium util code.
89 */
90 static boolean
91 wrap_mode_uses_border_color(unsigned mode)
92 {
93 switch (mode) {
94 case PIPE_TEX_WRAP_REPEAT:
95 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
96 case PIPE_TEX_WRAP_MIRROR_REPEAT:
97 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
98 return FALSE;
99 case PIPE_TEX_WRAP_CLAMP:
100 case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
101 case PIPE_TEX_WRAP_MIRROR_CLAMP:
102 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
103 return TRUE;
104 default:
105 assert(0 && "unexpected wrap mode");
106 return FALSE;
107 }
108 }
109
110
111
112 /**
113 * Gen code to fetch a texel from a texture at int coords (x, y).
114 * The result, texel, will be:
115 * texel[0] = red values
116 * texel[1] = green values
117 * texel[2] = blue values
118 * texel[3] = alpha values
119 */
120 static void
121 lp_build_sample_texel_soa(struct lp_build_sample_context *bld,
122 LLVMValueRef width,
123 LLVMValueRef height,
124 LLVMValueRef x,
125 LLVMValueRef y,
126 LLVMValueRef y_stride,
127 LLVMValueRef data_ptr,
128 LLVMValueRef *texel)
129 {
130 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
131 LLVMValueRef offset;
132 LLVMValueRef packed;
133 LLVMValueRef use_border = NULL;
134
135 /* use_border = x < 0 || x >= width || y < 0 || y >= height */
136 if (wrap_mode_uses_border_color(bld->static_state->wrap_s)) {
137 LLVMValueRef b1, b2;
138 b1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, x, int_coord_bld->zero);
139 b2 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, x, width);
140 use_border = LLVMBuildOr(bld->builder, b1, b2, "b1_or_b2");
141 }
142
143 if (wrap_mode_uses_border_color(bld->static_state->wrap_t)) {
144 LLVMValueRef b1, b2;
145 b1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, y, int_coord_bld->zero);
146 b2 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, y, height);
147 if (use_border) {
148 use_border = LLVMBuildOr(bld->builder, use_border, b1, "ub_or_b1");
149 use_border = LLVMBuildOr(bld->builder, use_border, b2, "ub_or_b2");
150 }
151 else {
152 use_border = LLVMBuildOr(bld->builder, b1, b2, "b1_or_b2");
153 }
154 }
155
156 /*
157 * Note: if we find an app which frequently samples the texture border
158 * we might want to implement a true conditional here to avoid sampling
159 * the texture whenever possible (since that's quite a bit of code).
160 * Ex:
161 * if (use_border) {
162 * texel = border_color;
163 * }
164 * else {
165 * texel = sample_texture(coord);
166 * }
167 * As it is now, we always sample the texture, then selectively replace
168 * the texel color results with the border color.
169 */
170
171 /* convert x,y coords to linear offset from start of texture, in bytes */
172 offset = lp_build_sample_offset(&bld->uint_coord_bld,
173 bld->format_desc,
174 x, y, y_stride,
175 data_ptr);
176
177 assert(bld->format_desc->block.width == 1);
178 assert(bld->format_desc->block.height == 1);
179 assert(bld->format_desc->block.bits <= bld->texel_type.width);
180
181 /* gather the texels from the texture */
182 packed = lp_build_gather(bld->builder,
183 bld->texel_type.length,
184 bld->format_desc->block.bits,
185 bld->texel_type.width,
186 data_ptr, offset);
187
188 /* convert texels to float rgba */
189 lp_build_unpack_rgba_soa(bld->builder,
190 bld->format_desc,
191 bld->texel_type,
192 packed, texel);
193
194 if (use_border) {
195 /* select texel color or border color depending on use_border */
196 int chan;
197 for (chan = 0; chan < 4; chan++) {
198 LLVMValueRef border_chan =
199 lp_build_const_scalar(bld->texel_type,
200 bld->static_state->border_color[chan]);
201 texel[chan] = lp_build_select(&bld->texel_bld, use_border,
202 border_chan, texel[chan]);
203 }
204 }
205 }
206
207
208 static LLVMValueRef
209 lp_build_sample_packed(struct lp_build_sample_context *bld,
210 LLVMValueRef x,
211 LLVMValueRef y,
212 LLVMValueRef y_stride,
213 LLVMValueRef data_ptr)
214 {
215 LLVMValueRef offset;
216
217 offset = lp_build_sample_offset(&bld->uint_coord_bld,
218 bld->format_desc,
219 x, y, y_stride,
220 data_ptr);
221
222 assert(bld->format_desc->block.width == 1);
223 assert(bld->format_desc->block.height == 1);
224 assert(bld->format_desc->block.bits <= bld->texel_type.width);
225
226 return lp_build_gather(bld->builder,
227 bld->texel_type.length,
228 bld->format_desc->block.bits,
229 bld->texel_type.width,
230 data_ptr, offset);
231 }
232
233
234 /**
235 * Helper to compute the mirror function for the PIPE_WRAP_MIRROR modes.
236 */
237 static LLVMValueRef
238 lp_build_coord_mirror(struct lp_build_sample_context *bld,
239 LLVMValueRef coord)
240 {
241 struct lp_build_context *coord_bld = &bld->coord_bld;
242 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
243 LLVMValueRef fract, flr, isOdd;
244
245 /* fract = coord - floor(coord) */
246 fract = lp_build_sub(coord_bld, coord, lp_build_floor(coord_bld, coord));
247
248 /* flr = ifloor(coord); */
249 flr = lp_build_ifloor(coord_bld, coord);
250
251 /* isOdd = flr & 1 */
252 isOdd = LLVMBuildAnd(bld->builder, flr, int_coord_bld->one, "");
253
254 /* make coord positive or negative depending on isOdd */
255 coord = lp_build_set_sign(coord_bld, fract, isOdd);
256
257 /* convert isOdd to float */
258 isOdd = lp_build_int_to_float(coord_bld, isOdd);
259
260 /* add isOdd to coord */
261 coord = lp_build_add(coord_bld, coord, isOdd);
262
263 return coord;
264 }
265
266
267 /**
268 * We only support a few wrap modes in lp_build_sample_wrap_int() at this time.
269 * Return whether the given mode is supported by that function.
270 */
271 static boolean
272 is_simple_wrap_mode(unsigned mode)
273 {
274 switch (mode) {
275 case PIPE_TEX_WRAP_REPEAT:
276 case PIPE_TEX_WRAP_CLAMP:
277 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
278 return TRUE;
279 case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
280 default:
281 return FALSE;
282 }
283 }
284
285
286 /**
287 * Build LLVM code for texture wrap mode, for scaled integer texcoords.
288 * \param coord the incoming texcoord (s,t,r or q) scaled to the texture size
289 * \param length the texture size along one dimension
290 * \param is_pot if TRUE, length is a power of two
291 * \param wrap_mode one of PIPE_TEX_WRAP_x
292 */
293 static LLVMValueRef
294 lp_build_sample_wrap_int(struct lp_build_sample_context *bld,
295 LLVMValueRef coord,
296 LLVMValueRef length,
297 boolean is_pot,
298 unsigned wrap_mode)
299 {
300 struct lp_build_context *uint_coord_bld = &bld->uint_coord_bld;
301 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
302 LLVMValueRef length_minus_one;
303
304 length_minus_one = lp_build_sub(uint_coord_bld, length, uint_coord_bld->one);
305
306 switch(wrap_mode) {
307 case PIPE_TEX_WRAP_REPEAT:
308 if(is_pot)
309 coord = LLVMBuildAnd(bld->builder, coord, length_minus_one, "");
310 else
311 /* Signed remainder won't give the right results for negative
312 * dividends but unsigned remainder does.*/
313 coord = LLVMBuildURem(bld->builder, coord, length, "");
314 break;
315
316 case PIPE_TEX_WRAP_CLAMP:
317 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
318 case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
319 coord = lp_build_max(int_coord_bld, coord, int_coord_bld->zero);
320 coord = lp_build_min(int_coord_bld, coord, length_minus_one);
321 break;
322
323 case PIPE_TEX_WRAP_MIRROR_REPEAT:
324 case PIPE_TEX_WRAP_MIRROR_CLAMP:
325 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
326 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
327 /* FIXME */
328 _debug_printf("llvmpipe: failed to translate texture wrap mode %s\n",
329 util_dump_tex_wrap(wrap_mode, TRUE));
330 coord = lp_build_max(uint_coord_bld, coord, uint_coord_bld->zero);
331 coord = lp_build_min(uint_coord_bld, coord, length_minus_one);
332 break;
333
334 default:
335 assert(0);
336 }
337
338 return coord;
339 }
340
341
342 /**
343 * Build LLVM code for texture wrap mode for linear filtering.
344 * \param x0_out returns first integer texcoord
345 * \param x1_out returns second integer texcoord
346 * \param weight_out returns linear interpolation weight
347 */
348 static void
349 lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
350 LLVMValueRef coord,
351 LLVMValueRef length,
352 boolean is_pot,
353 unsigned wrap_mode,
354 LLVMValueRef *x0_out,
355 LLVMValueRef *x1_out,
356 LLVMValueRef *weight_out)
357 {
358 struct lp_build_context *coord_bld = &bld->coord_bld;
359 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
360 struct lp_build_context *uint_coord_bld = &bld->uint_coord_bld;
361 LLVMValueRef two = lp_build_const_scalar(coord_bld->type, 2.0);
362 LLVMValueRef half = lp_build_const_scalar(coord_bld->type, 0.5);
363 LLVMValueRef length_f = lp_build_int_to_float(coord_bld, length);
364 LLVMValueRef length_minus_one = lp_build_sub(uint_coord_bld, length, uint_coord_bld->one);
365 LLVMValueRef length_f_minus_one = lp_build_sub(coord_bld, length_f, coord_bld->one);
366 LLVMValueRef coord0, coord1, weight;
367
368 switch(wrap_mode) {
369 case PIPE_TEX_WRAP_REPEAT:
370 /* mul by size and subtract 0.5 */
371 coord = lp_build_mul(coord_bld, coord, length_f);
372 coord = lp_build_sub(coord_bld, coord, half);
373 /* convert to int */
374 coord0 = lp_build_ifloor(coord_bld, coord);
375 coord1 = lp_build_add(uint_coord_bld, coord0, uint_coord_bld->one);
376 /* compute lerp weight */
377 weight = lp_build_fract(coord_bld, coord);
378 /* repeat wrap */
379 if (is_pot) {
380 coord0 = LLVMBuildAnd(bld->builder, coord0, length_minus_one, "");
381 coord1 = LLVMBuildAnd(bld->builder, coord1, length_minus_one, "");
382 }
383 else {
384 /* Signed remainder won't give the right results for negative
385 * dividends but unsigned remainder does.*/
386 coord0 = LLVMBuildURem(bld->builder, coord0, length, "");
387 coord1 = LLVMBuildURem(bld->builder, coord1, length, "");
388 }
389 break;
390
391 case PIPE_TEX_WRAP_CLAMP:
392 if (bld->static_state->normalized_coords) {
393 coord = lp_build_mul(coord_bld, coord, length_f);
394 }
395 weight = lp_build_fract(coord_bld, coord);
396 coord0 = lp_build_clamp(coord_bld, coord, coord_bld->zero,
397 length_f_minus_one);
398 coord1 = lp_build_add(coord_bld, coord, coord_bld->one);
399 coord1 = lp_build_clamp(coord_bld, coord1, coord_bld->zero,
400 length_f_minus_one);
401 coord0 = lp_build_ifloor(coord_bld, coord0);
402 coord1 = lp_build_ifloor(coord_bld, coord1);
403 break;
404
405 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
406 if (bld->static_state->normalized_coords) {
407 /* clamp to [0,1] */
408 coord = lp_build_clamp(coord_bld, coord, coord_bld->zero, coord_bld->one);
409 /* mul by tex size and subtract 0.5 */
410 coord = lp_build_mul(coord_bld, coord, length_f);
411 coord = lp_build_sub(coord_bld, coord, half);
412 }
413 else {
414 LLVMValueRef min, max;
415 /* clamp to [0.5, length - 0.5] */
416 min = lp_build_const_scalar(coord_bld->type, 0.5F);
417 max = lp_build_sub(coord_bld, length_f, min);
418 coord = lp_build_clamp(coord_bld, coord, min, max);
419 }
420 /* compute lerp weight */
421 weight = lp_build_fract(coord_bld, coord);
422 /* coord0 = floor(coord); */
423 coord0 = lp_build_ifloor(coord_bld, coord);
424 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
425 /* coord0 = max(coord0, 0) */
426 coord0 = lp_build_max(int_coord_bld, coord0, int_coord_bld->zero);
427 /* coord1 = min(coord1, length-1) */
428 coord1 = lp_build_min(int_coord_bld, coord1, length_minus_one);
429 break;
430
431 case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
432 {
433 LLVMValueRef min, max;
434 if (bld->static_state->normalized_coords) {
435 /* min = -1.0 / (2 * length) = -0.5 / length */
436 min = lp_build_mul(coord_bld,
437 lp_build_const_scalar(coord_bld->type, -0.5F),
438 lp_build_rcp(coord_bld, length_f));
439 /* max = 1.0 - min */
440 max = lp_build_sub(coord_bld, coord_bld->one, min);
441 /* coord = clamp(coord, min, max) */
442 coord = lp_build_clamp(coord_bld, coord, min, max);
443 /* scale coord to length (and sub 0.5?) */
444 coord = lp_build_mul(coord_bld, coord, length_f);
445 coord = lp_build_sub(coord_bld, coord, half);
446 }
447 else {
448 /* clamp to [-0.5, length + 0.5] */
449 min = lp_build_const_scalar(coord_bld->type, -0.5F);
450 max = lp_build_sub(coord_bld, length_f, min);
451 coord = lp_build_clamp(coord_bld, coord, min, max);
452 coord = lp_build_sub(coord_bld, coord, half);
453 }
454 /* compute lerp weight */
455 weight = lp_build_fract(coord_bld, coord);
456 /* convert to int */
457 coord0 = lp_build_ifloor(coord_bld, coord);
458 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
459 }
460 break;
461
462 case PIPE_TEX_WRAP_MIRROR_REPEAT:
463 /* compute mirror function */
464 coord = lp_build_coord_mirror(bld, coord);
465
466 /* scale coord to length */
467 coord = lp_build_mul(coord_bld, coord, length_f);
468 coord = lp_build_sub(coord_bld, coord, half);
469
470 /* compute lerp weight */
471 weight = lp_build_fract(coord_bld, coord);
472
473 /* convert to int coords */
474 coord0 = lp_build_ifloor(coord_bld, coord);
475 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
476
477 /* coord0 = max(coord0, 0) */
478 coord0 = lp_build_max(int_coord_bld, coord0, int_coord_bld->zero);
479 /* coord1 = min(coord1, length-1) */
480 coord1 = lp_build_min(int_coord_bld, coord1, length_minus_one);
481 break;
482
483 case PIPE_TEX_WRAP_MIRROR_CLAMP:
484 {
485 LLVMValueRef min, max;
486 /* min = 1.0 / (2 * length) */
487 min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f));
488 /* max = 1.0 - min */
489 max = lp_build_sub(coord_bld, coord_bld->one, min);
490
491 coord = lp_build_abs(coord_bld, coord);
492 coord = lp_build_clamp(coord_bld, coord, min, max);
493 coord = lp_build_mul(coord_bld, coord, length_f);
494 if(0)coord = lp_build_sub(coord_bld, coord, half);
495 weight = lp_build_fract(coord_bld, coord);
496 coord0 = lp_build_ifloor(coord_bld, coord);
497 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
498 }
499 break;
500
501 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
502 {
503 LLVMValueRef min, max;
504 /* min = 1.0 / (2 * length) */
505 min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f));
506 /* max = 1.0 - min */
507 max = lp_build_sub(coord_bld, coord_bld->one, min);
508
509 coord = lp_build_abs(coord_bld, coord);
510 coord = lp_build_clamp(coord_bld, coord, min, max);
511 coord = lp_build_mul(coord_bld, coord, length_f);
512 coord = lp_build_sub(coord_bld, coord, half);
513 weight = lp_build_fract(coord_bld, coord);
514 coord0 = lp_build_ifloor(coord_bld, coord);
515 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
516 }
517 break;
518
519 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
520 {
521 LLVMValueRef min, max;
522 /* min = -1.0 / (2 * length) = -0.5 / length */
523 min = lp_build_mul(coord_bld,
524 lp_build_const_scalar(coord_bld->type, -0.5F),
525 lp_build_rcp(coord_bld, length_f));
526 /* max = 1.0 - min */
527 max = lp_build_sub(coord_bld, coord_bld->one, min);
528
529 coord = lp_build_abs(coord_bld, coord);
530 coord = lp_build_clamp(coord_bld, coord, min, max);
531 coord = lp_build_mul(coord_bld, coord, length_f);
532 coord = lp_build_sub(coord_bld, coord, half);
533 weight = lp_build_fract(coord_bld, coord);
534 coord0 = lp_build_ifloor(coord_bld, coord);
535 coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
536 }
537 break;
538
539 default:
540 assert(0);
541 }
542
543 *x0_out = coord0;
544 *x1_out = coord1;
545 *weight_out = weight;
546 }
547
548
549 /**
550 * Build LLVM code for texture wrap mode for nearest filtering.
551 * \param coord the incoming texcoord (nominally in [0,1])
552 * \param length the texture size along one dimension, as int
553 * \param is_pot if TRUE, length is a power of two
554 * \param wrap_mode one of PIPE_TEX_WRAP_x
555 */
556 static LLVMValueRef
557 lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
558 LLVMValueRef coord,
559 LLVMValueRef length,
560 boolean is_pot,
561 unsigned wrap_mode)
562 {
563 struct lp_build_context *coord_bld = &bld->coord_bld;
564 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
565 struct lp_build_context *uint_coord_bld = &bld->uint_coord_bld;
566 LLVMValueRef two = lp_build_const_scalar(coord_bld->type, 2.0);
567 LLVMValueRef length_f = lp_build_int_to_float(coord_bld, length);
568 LLVMValueRef length_minus_one = lp_build_sub(uint_coord_bld, length, uint_coord_bld->one);
569 LLVMValueRef length_f_minus_one = lp_build_sub(coord_bld, length_f, coord_bld->one);
570 LLVMValueRef icoord;
571
572 switch(wrap_mode) {
573 case PIPE_TEX_WRAP_REPEAT:
574 coord = lp_build_mul(coord_bld, coord, length_f);
575 icoord = lp_build_ifloor(coord_bld, coord);
576 if (is_pot)
577 icoord = LLVMBuildAnd(bld->builder, icoord, length_minus_one, "");
578 else
579 /* Signed remainder won't give the right results for negative
580 * dividends but unsigned remainder does.*/
581 icoord = LLVMBuildURem(bld->builder, icoord, length, "");
582 break;
583
584 case PIPE_TEX_WRAP_CLAMP:
585 /* mul by size */
586 if (bld->static_state->normalized_coords) {
587 coord = lp_build_mul(coord_bld, coord, length_f);
588 }
589 /* floor */
590 icoord = lp_build_ifloor(coord_bld, coord);
591 /* clamp to [0, size-1]. Note: int coord builder type */
592 icoord = lp_build_clamp(int_coord_bld, icoord, int_coord_bld->zero,
593 length_minus_one);
594 break;
595
596 case PIPE_TEX_WRAP_CLAMP_TO_EDGE:
597 {
598 LLVMValueRef min, max;
599 if (bld->static_state->normalized_coords) {
600 /* min = 1.0 / (2 * length) */
601 min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f));
602 /* max = length - min */
603 max = lp_build_sub(coord_bld, length_f, min);
604 /* scale coord to length */
605 coord = lp_build_mul(coord_bld, coord, length_f);
606 }
607 else {
608 /* clamp to [0.5, length - 0.5] */
609 min = lp_build_const_scalar(coord_bld->type, 0.5F);
610 max = lp_build_sub(coord_bld, length_f, min);
611 }
612 /* coord = clamp(coord, min, max) */
613 coord = lp_build_clamp(coord_bld, coord, min, max);
614 icoord = lp_build_ifloor(coord_bld, coord);
615 }
616 break;
617
618 case PIPE_TEX_WRAP_CLAMP_TO_BORDER:
619 /* Note: this is the same as CLAMP_TO_EDGE, except min = -min */
620 {
621 LLVMValueRef min, max;
622 if (bld->static_state->normalized_coords) {
623 /* min = -1.0 / (2 * length) = -0.5 / length */
624 min = lp_build_mul(coord_bld,
625 lp_build_const_scalar(coord_bld->type, -0.5F),
626 lp_build_rcp(coord_bld, length_f));
627 /* max = length - min */
628 max = lp_build_sub(coord_bld, length_f, min);
629 /* scale coord to length */
630 coord = lp_build_mul(coord_bld, coord, length_f);
631 }
632 else {
633 /* clamp to [-0.5, length + 0.5] */
634 min = lp_build_const_scalar(coord_bld->type, -0.5F);
635 max = lp_build_sub(coord_bld, length_f, min);
636 }
637 /* coord = clamp(coord, min, max) */
638 coord = lp_build_clamp(coord_bld, coord, min, max);
639 icoord = lp_build_ifloor(coord_bld, coord);
640 }
641 break;
642
643 case PIPE_TEX_WRAP_MIRROR_REPEAT:
644 {
645 LLVMValueRef min, max;
646 /* min = 1.0 / (2 * length) */
647 min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f));
648 /* max = length - min */
649 max = lp_build_sub(coord_bld, length_f, min);
650
651 /* compute mirror function */
652 coord = lp_build_coord_mirror(bld, coord);
653
654 /* scale coord to length */
655 coord = lp_build_mul(coord_bld, coord, length_f);
656
657 /* coord = clamp(coord, min, max) */
658 coord = lp_build_clamp(coord_bld, coord, min, max);
659 icoord = lp_build_ifloor(coord_bld, coord);
660 }
661 break;
662
663 case PIPE_TEX_WRAP_MIRROR_CLAMP:
664 coord = lp_build_abs(coord_bld, coord);
665 coord = lp_build_mul(coord_bld, coord, length_f);
666 coord = lp_build_clamp(coord_bld, coord, coord_bld->zero, length_f_minus_one);
667 icoord = lp_build_ifloor(coord_bld, coord);
668 break;
669
670 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
671 {
672 LLVMValueRef min, max;
673 /* min = 1.0 / (2 * length) */
674 min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f));
675 /* max = length - min */
676 max = lp_build_sub(coord_bld, length_f, min);
677
678 coord = lp_build_abs(coord_bld, coord);
679 coord = lp_build_mul(coord_bld, coord, length_f);
680 coord = lp_build_clamp(coord_bld, coord, min, max);
681 icoord = lp_build_ifloor(coord_bld, coord);
682 }
683 break;
684
685 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
686 {
687 LLVMValueRef min, max;
688 /* min = 1.0 / (2 * length) */
689 min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f));
690 min = lp_build_negate(coord_bld, min);
691 /* max = length - min */
692 max = lp_build_sub(coord_bld, length_f, min);
693
694 coord = lp_build_abs(coord_bld, coord);
695 coord = lp_build_mul(coord_bld, coord, length_f);
696 coord = lp_build_clamp(coord_bld, coord, min, max);
697 icoord = lp_build_ifloor(coord_bld, coord);
698 }
699 break;
700
701 default:
702 assert(0);
703 }
704
705 return icoord;
706 }
707
708
709 /**
710 * Sample 2D texture with nearest filtering.
711 */
712 static void
713 lp_build_sample_2d_nearest_soa(struct lp_build_sample_context *bld,
714 LLVMValueRef s,
715 LLVMValueRef t,
716 LLVMValueRef width,
717 LLVMValueRef height,
718 LLVMValueRef stride,
719 LLVMValueRef data_ptr,
720 LLVMValueRef *texel)
721 {
722 LLVMValueRef x, y;
723
724 x = lp_build_sample_wrap_nearest(bld, s, width,
725 bld->static_state->pot_width,
726 bld->static_state->wrap_s);
727 y = lp_build_sample_wrap_nearest(bld, t, height,
728 bld->static_state->pot_height,
729 bld->static_state->wrap_t);
730
731 lp_build_name(x, "tex.x.wrapped");
732 lp_build_name(y, "tex.y.wrapped");
733
734 lp_build_sample_texel_soa(bld, width, height, x, y, stride, data_ptr, texel);
735 }
736
737
738 /**
739 * Sample 2D texture with bilinear filtering.
740 */
741 static void
742 lp_build_sample_2d_linear_soa(struct lp_build_sample_context *bld,
743 LLVMValueRef s,
744 LLVMValueRef t,
745 LLVMValueRef width,
746 LLVMValueRef height,
747 LLVMValueRef stride,
748 LLVMValueRef data_ptr,
749 LLVMValueRef *texel)
750 {
751 LLVMValueRef s_fpart;
752 LLVMValueRef t_fpart;
753 LLVMValueRef x0, x1;
754 LLVMValueRef y0, y1;
755 LLVMValueRef neighbors[2][2][4];
756 unsigned chan;
757
758 lp_build_sample_wrap_linear(bld, s, width, bld->static_state->pot_width,
759 bld->static_state->wrap_s, &x0, &x1, &s_fpart);
760 lp_build_sample_wrap_linear(bld, t, height, bld->static_state->pot_height,
761 bld->static_state->wrap_t, &y0, &y1, &t_fpart);
762
763 lp_build_sample_texel_soa(bld, width, height, x0, y0, stride, data_ptr, neighbors[0][0]);
764 lp_build_sample_texel_soa(bld, width, height, x1, y0, stride, data_ptr, neighbors[0][1]);
765 lp_build_sample_texel_soa(bld, width, height, x0, y1, stride, data_ptr, neighbors[1][0]);
766 lp_build_sample_texel_soa(bld, width, height, x1, y1, stride, data_ptr, neighbors[1][1]);
767
768 /* TODO: Don't interpolate missing channels */
769 for(chan = 0; chan < 4; ++chan) {
770 texel[chan] = lp_build_lerp_2d(&bld->texel_bld,
771 s_fpart, t_fpart,
772 neighbors[0][0][chan],
773 neighbors[0][1][chan],
774 neighbors[1][0][chan],
775 neighbors[1][1][chan]);
776 }
777 }
778
779
780 static void
781 lp_build_rgba8_to_f32_soa(LLVMBuilderRef builder,
782 struct lp_type dst_type,
783 LLVMValueRef packed,
784 LLVMValueRef *rgba)
785 {
786 LLVMValueRef mask = lp_build_int_const_scalar(dst_type, 0xff);
787 unsigned chan;
788
789 /* Decode the input vector components */
790 for (chan = 0; chan < 4; ++chan) {
791 unsigned start = chan*8;
792 unsigned stop = start + 8;
793 LLVMValueRef input;
794
795 input = packed;
796
797 if(start)
798 input = LLVMBuildLShr(builder, input, lp_build_int_const_scalar(dst_type, start), "");
799
800 if(stop < 32)
801 input = LLVMBuildAnd(builder, input, mask, "");
802
803 input = lp_build_unsigned_norm_to_float(builder, 8, dst_type, input);
804
805 rgba[chan] = input;
806 }
807 }
808
809
810 static void
811 lp_build_sample_2d_linear_aos(struct lp_build_sample_context *bld,
812 LLVMValueRef s,
813 LLVMValueRef t,
814 LLVMValueRef width,
815 LLVMValueRef height,
816 LLVMValueRef stride,
817 LLVMValueRef data_ptr,
818 LLVMValueRef *texel)
819 {
820 LLVMBuilderRef builder = bld->builder;
821 struct lp_build_context i32, h16, u8n;
822 LLVMTypeRef i32_vec_type, h16_vec_type, u8n_vec_type;
823 LLVMValueRef i32_c8, i32_c128, i32_c255;
824 LLVMValueRef s_ipart, s_fpart, s_fpart_lo, s_fpart_hi;
825 LLVMValueRef t_ipart, t_fpart, t_fpart_lo, t_fpart_hi;
826 LLVMValueRef x0, x1;
827 LLVMValueRef y0, y1;
828 LLVMValueRef neighbors[2][2];
829 LLVMValueRef neighbors_lo[2][2];
830 LLVMValueRef neighbors_hi[2][2];
831 LLVMValueRef packed, packed_lo, packed_hi;
832 LLVMValueRef unswizzled[4];
833
834 lp_build_context_init(&i32, builder, lp_type_int(32));
835 lp_build_context_init(&h16, builder, lp_type_ufixed(16));
836 lp_build_context_init(&u8n, builder, lp_type_unorm(8));
837
838 i32_vec_type = lp_build_vec_type(i32.type);
839 h16_vec_type = lp_build_vec_type(h16.type);
840 u8n_vec_type = lp_build_vec_type(u8n.type);
841
842 if (bld->static_state->normalized_coords) {
843 LLVMTypeRef coord_vec_type = lp_build_vec_type(bld->coord_type);
844 LLVMValueRef fp_width = LLVMBuildSIToFP(bld->builder, width, coord_vec_type, "");
845 LLVMValueRef fp_height = LLVMBuildSIToFP(bld->builder, height, coord_vec_type, "");
846 s = lp_build_mul(&bld->coord_bld, s, fp_width);
847 t = lp_build_mul(&bld->coord_bld, t, fp_height);
848 }
849
850 /* scale coords by 256 (8 fractional bits) */
851 s = lp_build_mul_imm(&bld->coord_bld, s, 256);
852 t = lp_build_mul_imm(&bld->coord_bld, t, 256);
853
854 /* convert float to int */
855 s = LLVMBuildFPToSI(builder, s, i32_vec_type, "");
856 t = LLVMBuildFPToSI(builder, t, i32_vec_type, "");
857
858 /* subtract 0.5 (add -128) */
859 i32_c128 = lp_build_int_const_scalar(i32.type, -128);
860 s = LLVMBuildAdd(builder, s, i32_c128, "");
861 t = LLVMBuildAdd(builder, t, i32_c128, "");
862
863 /* compute floor (shift right 8) */
864 i32_c8 = lp_build_int_const_scalar(i32.type, 8);
865 s_ipart = LLVMBuildAShr(builder, s, i32_c8, "");
866 t_ipart = LLVMBuildAShr(builder, t, i32_c8, "");
867
868 /* compute fractional part (AND with 0xff) */
869 i32_c255 = lp_build_int_const_scalar(i32.type, 255);
870 s_fpart = LLVMBuildAnd(builder, s, i32_c255, "");
871 t_fpart = LLVMBuildAnd(builder, t, i32_c255, "");
872
873 x0 = s_ipart;
874 y0 = t_ipart;
875
876 x1 = lp_build_add(&bld->int_coord_bld, x0, bld->int_coord_bld.one);
877 y1 = lp_build_add(&bld->int_coord_bld, y0, bld->int_coord_bld.one);
878
879 x0 = lp_build_sample_wrap_int(bld, x0, width, bld->static_state->pot_width,
880 bld->static_state->wrap_s);
881 y0 = lp_build_sample_wrap_int(bld, y0, height, bld->static_state->pot_height,
882 bld->static_state->wrap_t);
883
884 x1 = lp_build_sample_wrap_int(bld, x1, width, bld->static_state->pot_width,
885 bld->static_state->wrap_s);
886 y1 = lp_build_sample_wrap_int(bld, y1, height, bld->static_state->pot_height,
887 bld->static_state->wrap_t);
888
889 /*
890 * Transform 4 x i32 in
891 *
892 * s_fpart = {s0, s1, s2, s3}
893 *
894 * into 8 x i16
895 *
896 * s_fpart = {00, s0, 00, s1, 00, s2, 00, s3}
897 *
898 * into two 8 x i16
899 *
900 * s_fpart_lo = {s0, s0, s0, s0, s1, s1, s1, s1}
901 * s_fpart_hi = {s2, s2, s2, s2, s3, s3, s3, s3}
902 *
903 * and likewise for t_fpart. There is no risk of loosing precision here
904 * since the fractional parts only use the lower 8bits.
905 */
906
907 s_fpart = LLVMBuildBitCast(builder, s_fpart, h16_vec_type, "");
908 t_fpart = LLVMBuildBitCast(builder, t_fpart, h16_vec_type, "");
909
910 {
911 LLVMTypeRef elem_type = LLVMInt32Type();
912 LLVMValueRef shuffles_lo[LP_MAX_VECTOR_LENGTH];
913 LLVMValueRef shuffles_hi[LP_MAX_VECTOR_LENGTH];
914 LLVMValueRef shuffle_lo;
915 LLVMValueRef shuffle_hi;
916 unsigned i, j;
917
918 for(j = 0; j < h16.type.length; j += 4) {
919 unsigned subindex = util_cpu_caps.little_endian ? 0 : 1;
920 LLVMValueRef index;
921
922 index = LLVMConstInt(elem_type, j/2 + subindex, 0);
923 for(i = 0; i < 4; ++i)
924 shuffles_lo[j + i] = index;
925
926 index = LLVMConstInt(elem_type, h16.type.length/2 + j/2 + subindex, 0);
927 for(i = 0; i < 4; ++i)
928 shuffles_hi[j + i] = index;
929 }
930
931 shuffle_lo = LLVMConstVector(shuffles_lo, h16.type.length);
932 shuffle_hi = LLVMConstVector(shuffles_hi, h16.type.length);
933
934 s_fpart_lo = LLVMBuildShuffleVector(builder, s_fpart, h16.undef, shuffle_lo, "");
935 t_fpart_lo = LLVMBuildShuffleVector(builder, t_fpart, h16.undef, shuffle_lo, "");
936 s_fpart_hi = LLVMBuildShuffleVector(builder, s_fpart, h16.undef, shuffle_hi, "");
937 t_fpart_hi = LLVMBuildShuffleVector(builder, t_fpart, h16.undef, shuffle_hi, "");
938 }
939
940 /*
941 * Fetch the pixels as 4 x 32bit (rgba order might differ):
942 *
943 * rgba0 rgba1 rgba2 rgba3
944 *
945 * bit cast them into 16 x u8
946 *
947 * r0 g0 b0 a0 r1 g1 b1 a1 r2 g2 b2 a2 r3 g3 b3 a3
948 *
949 * unpack them into two 8 x i16:
950 *
951 * r0 g0 b0 a0 r1 g1 b1 a1
952 * r2 g2 b2 a2 r3 g3 b3 a3
953 *
954 * The higher 8 bits of the resulting elements will be zero.
955 */
956
957 neighbors[0][0] = lp_build_sample_packed(bld, x0, y0, stride, data_ptr);
958 neighbors[0][1] = lp_build_sample_packed(bld, x1, y0, stride, data_ptr);
959 neighbors[1][0] = lp_build_sample_packed(bld, x0, y1, stride, data_ptr);
960 neighbors[1][1] = lp_build_sample_packed(bld, x1, y1, stride, data_ptr);
961
962 neighbors[0][0] = LLVMBuildBitCast(builder, neighbors[0][0], u8n_vec_type, "");
963 neighbors[0][1] = LLVMBuildBitCast(builder, neighbors[0][1], u8n_vec_type, "");
964 neighbors[1][0] = LLVMBuildBitCast(builder, neighbors[1][0], u8n_vec_type, "");
965 neighbors[1][1] = LLVMBuildBitCast(builder, neighbors[1][1], u8n_vec_type, "");
966
967 lp_build_unpack2(builder, u8n.type, h16.type, neighbors[0][0], &neighbors_lo[0][0], &neighbors_hi[0][0]);
968 lp_build_unpack2(builder, u8n.type, h16.type, neighbors[0][1], &neighbors_lo[0][1], &neighbors_hi[0][1]);
969 lp_build_unpack2(builder, u8n.type, h16.type, neighbors[1][0], &neighbors_lo[1][0], &neighbors_hi[1][0]);
970 lp_build_unpack2(builder, u8n.type, h16.type, neighbors[1][1], &neighbors_lo[1][1], &neighbors_hi[1][1]);
971
972 /*
973 * Linear interpolate with 8.8 fixed point.
974 */
975
976 packed_lo = lp_build_lerp_2d(&h16,
977 s_fpart_lo, t_fpart_lo,
978 neighbors_lo[0][0],
979 neighbors_lo[0][1],
980 neighbors_lo[1][0],
981 neighbors_lo[1][1]);
982
983 packed_hi = lp_build_lerp_2d(&h16,
984 s_fpart_hi, t_fpart_hi,
985 neighbors_hi[0][0],
986 neighbors_hi[0][1],
987 neighbors_hi[1][0],
988 neighbors_hi[1][1]);
989
990 packed = lp_build_pack2(builder, h16.type, u8n.type, packed_lo, packed_hi);
991
992 /*
993 * Convert to SoA and swizzle.
994 */
995
996 packed = LLVMBuildBitCast(builder, packed, i32_vec_type, "");
997
998 lp_build_rgba8_to_f32_soa(bld->builder,
999 bld->texel_type,
1000 packed, unswizzled);
1001
1002 lp_build_format_swizzle_soa(bld->format_desc,
1003 bld->texel_type, unswizzled,
1004 texel);
1005 }
1006
1007
1008 static void
1009 lp_build_sample_compare(struct lp_build_sample_context *bld,
1010 LLVMValueRef p,
1011 LLVMValueRef *texel)
1012 {
1013 struct lp_build_context *texel_bld = &bld->texel_bld;
1014 LLVMValueRef res;
1015 unsigned chan;
1016
1017 if(bld->static_state->compare_mode == PIPE_TEX_COMPARE_NONE)
1018 return;
1019
1020 /* TODO: Compare before swizzling, to avoid redundant computations */
1021 res = NULL;
1022 for(chan = 0; chan < 4; ++chan) {
1023 LLVMValueRef cmp;
1024 cmp = lp_build_cmp(texel_bld, bld->static_state->compare_func, p, texel[chan]);
1025 cmp = lp_build_select(texel_bld, cmp, texel_bld->one, texel_bld->zero);
1026
1027 if(res)
1028 res = lp_build_add(texel_bld, res, cmp);
1029 else
1030 res = cmp;
1031 }
1032
1033 assert(res);
1034 res = lp_build_mul(texel_bld, res, lp_build_const_scalar(texel_bld->type, 0.25));
1035
1036 /* XXX returning result for default GL_DEPTH_TEXTURE_MODE = GL_LUMINANCE */
1037 for(chan = 0; chan < 3; ++chan)
1038 texel[chan] = res;
1039 texel[3] = texel_bld->one;
1040 }
1041
1042
1043 static int
1044 texture_dims(enum pipe_texture_target tex)
1045 {
1046 switch (tex) {
1047 case PIPE_TEXTURE_1D:
1048 return 1;
1049 case PIPE_TEXTURE_2D:
1050 case PIPE_TEXTURE_CUBE:
1051 return 2;
1052 case PIPE_TEXTURE_3D:
1053 return 3;
1054 default:
1055 assert(0 && "bad texture target in texture_dims()");
1056 return 2;
1057 }
1058 }
1059
1060
1061 /**
1062 * Generate code to compute texture level of detail (lambda).
1063 * \param s vector of texcoord s values
1064 * \param t vector of texcoord t values
1065 * \param r vector of texcoord r values
1066 * \param width scalar int texture width
1067 * \param height scalar int texture height
1068 * \param depth scalar int texture depth
1069 */
1070 static LLVMValueRef
1071 lp_build_lod_selector(struct lp_build_sample_context *bld,
1072 LLVMValueRef s,
1073 LLVMValueRef t,
1074 LLVMValueRef r,
1075 LLVMValueRef width,
1076 LLVMValueRef height,
1077 LLVMValueRef depth)
1078
1079 {
1080 const int dims = texture_dims(bld->static_state->target);
1081 struct lp_build_context *coord_bld = &bld->coord_bld;
1082
1083 LLVMValueRef lod_bias = lp_build_const_scalar(bld->coord_bld.type,
1084 bld->static_state->lod_bias);
1085 LLVMValueRef min_lod = lp_build_const_scalar(bld->coord_bld.type,
1086 bld->static_state->min_lod);
1087 LLVMValueRef max_lod = lp_build_const_scalar(bld->coord_bld.type,
1088 bld->static_state->max_lod);
1089
1090 LLVMValueRef index0 = LLVMConstInt(LLVMInt32Type(), 0, 0);
1091 LLVMValueRef index1 = LLVMConstInt(LLVMInt32Type(), 1, 0);
1092 LLVMValueRef index2 = LLVMConstInt(LLVMInt32Type(), 2, 0);
1093
1094 LLVMValueRef s0, s1, s2;
1095 LLVMValueRef t0, t1, t2;
1096 LLVMValueRef r0, r1, r2;
1097 LLVMValueRef dsdx, dsdy, dtdx, dtdy, drdx, drdy;
1098 LLVMValueRef rho, lod;
1099
1100 /*
1101 * dsdx = abs(s[1] - s[0]);
1102 * dsdy = abs(s[2] - s[0]);
1103 * dtdx = abs(t[1] - t[0]);
1104 * dtdy = abs(t[2] - t[0]);
1105 * drdx = abs(r[1] - r[0]);
1106 * drdy = abs(r[2] - r[0]);
1107 * XXX we're assuming a four-element quad in 2x2 layout here.
1108 */
1109 s0 = LLVMBuildExtractElement(bld->builder, s, index0, "s0");
1110 s1 = LLVMBuildExtractElement(bld->builder, s, index1, "s1");
1111 s2 = LLVMBuildExtractElement(bld->builder, s, index2, "s2");
1112 dsdx = lp_build_abs(coord_bld, lp_build_sub(coord_bld, s1, s0));
1113 dsdy = lp_build_abs(coord_bld, lp_build_sub(coord_bld, s2, s0));
1114 if (dims > 1) {
1115 t0 = LLVMBuildExtractElement(bld->builder, t, index0, "t0");
1116 t1 = LLVMBuildExtractElement(bld->builder, t, index1, "t1");
1117 t2 = LLVMBuildExtractElement(bld->builder, t, index2, "t2");
1118 dtdx = lp_build_abs(coord_bld, lp_build_sub(coord_bld, t1, t0));
1119 dtdy = lp_build_abs(coord_bld, lp_build_sub(coord_bld, t2, t0));
1120 if (dims > 2) {
1121 r0 = LLVMBuildExtractElement(bld->builder, r, index0, "r0");
1122 r1 = LLVMBuildExtractElement(bld->builder, r, index1, "r1");
1123 r2 = LLVMBuildExtractElement(bld->builder, r, index2, "r2");
1124 drdx = lp_build_abs(coord_bld, lp_build_sub(coord_bld, r1, r0));
1125 drdy = lp_build_abs(coord_bld, lp_build_sub(coord_bld, r2, r0));
1126 }
1127 }
1128
1129 /* Compute rho = max of all partial derivatives scaled by texture size.
1130 * XXX this can be vectorized somewhat
1131 */
1132 rho = lp_build_mul(coord_bld,
1133 lp_build_max(coord_bld, dsdx, dsdy),
1134 lp_build_int_to_float(coord_bld, width));
1135 if (dims > 1) {
1136 LLVMValueRef max;
1137 max = lp_build_mul(coord_bld,
1138 lp_build_max(coord_bld, dtdx, dtdy),
1139 lp_build_int_to_float(coord_bld, height));
1140 rho = lp_build_max(coord_bld, rho, max);
1141 if (dims > 2) {
1142 max = lp_build_mul(coord_bld,
1143 lp_build_max(coord_bld, drdx, drdy),
1144 lp_build_int_to_float(coord_bld, depth));
1145 rho = lp_build_max(coord_bld, rho, max);
1146 }
1147 }
1148
1149 /* compute lod = log2(rho) */
1150 lod = lp_build_log2(coord_bld, rho);
1151
1152 /* add lod bias */
1153 lod = lp_build_add(coord_bld, lod, lod_bias);
1154
1155 /* clamp lod */
1156 lod = lp_build_clamp(coord_bld, lod, min_lod, max_lod);
1157
1158 return lod;
1159 }
1160
1161
1162 /**
1163 * For PIPE_TEX_MIPFILTER_NEAREST, convert float LOD to integer
1164 * mipmap level index.
1165 * \param lod scalar float texture level of detail
1166 * \param level_out returns integer
1167 */
1168 static void
1169 lp_build_nearest_mip_level(struct lp_build_sample_context *bld,
1170 unsigned unit,
1171 LLVMValueRef lod,
1172 LLVMValueRef *level_out)
1173 {
1174 struct lp_build_context *coord_bld = &bld->coord_bld;
1175 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
1176 LLVMValueRef last_level, level;
1177
1178 last_level = bld->dynamic_state->last_level(bld->dynamic_state,
1179 bld->builder, unit);
1180
1181 /* convert float lod to integer */
1182 level = lp_build_iround(coord_bld, lod);
1183
1184 /* clamp level to legal range of levels */
1185 *level_out = lp_build_clamp(int_coord_bld, level,
1186 int_coord_bld->zero,
1187 last_level);
1188 }
1189
1190
1191 /**
1192 * For PIPE_TEX_MIPFILTER_LINEAR, convert float LOD to integer to
1193 * two (adjacent) mipmap level indexes. Later, we'll sample from those
1194 * two mipmap levels and interpolate between them.
1195 */
1196 static void
1197 lp_build_linear_mip_levels(struct lp_build_sample_context *bld,
1198 unsigned unit,
1199 LLVMValueRef lod,
1200 LLVMValueRef *level0_out,
1201 LLVMValueRef *level1_out,
1202 LLVMValueRef *weight_out)
1203 {
1204 struct lp_build_context *coord_bld = &bld->coord_bld;
1205 struct lp_build_context *int_coord_bld = &bld->int_coord_bld;
1206 LLVMValueRef last_level, level;
1207
1208 last_level = bld->dynamic_state->last_level(bld->dynamic_state,
1209 bld->builder, unit);
1210
1211 /* convert float lod to integer */
1212 level = lp_build_ifloor(coord_bld, lod);
1213
1214 /* compute level 0 and clamp to legal range of levels */
1215 *level0_out = lp_build_clamp(int_coord_bld, level,
1216 int_coord_bld->zero,
1217 last_level);
1218 /* compute level 1 and clamp to legal range of levels */
1219 *level1_out = lp_build_add(int_coord_bld, *level0_out, int_coord_bld->one);
1220 *level1_out = lp_build_min(int_coord_bld, *level1_out, int_coord_bld->zero);
1221
1222 *weight_out = lp_build_fract(coord_bld, lod);
1223 }
1224
1225
1226
1227 /**
1228 * Build texture sampling code.
1229 * 'texel' will return a vector of four LLVMValueRefs corresponding to
1230 * R, G, B, A.
1231 */
1232 void
1233 lp_build_sample_soa(LLVMBuilderRef builder,
1234 const struct lp_sampler_static_state *static_state,
1235 struct lp_sampler_dynamic_state *dynamic_state,
1236 struct lp_type type,
1237 unsigned unit,
1238 unsigned num_coords,
1239 const LLVMValueRef *coords,
1240 LLVMValueRef lodbias,
1241 LLVMValueRef *texel)
1242 {
1243 struct lp_build_sample_context bld;
1244 LLVMValueRef width;
1245 LLVMValueRef height;
1246 LLVMValueRef stride;
1247 LLVMValueRef data_ptr;
1248 LLVMValueRef s;
1249 LLVMValueRef t;
1250 LLVMValueRef r;
1251
1252 (void) lp_build_lod_selector; /* temporary to silence warning */
1253 (void) lp_build_nearest_mip_level;
1254 (void) lp_build_linear_mip_levels;
1255
1256 /* Setup our build context */
1257 memset(&bld, 0, sizeof bld);
1258 bld.builder = builder;
1259 bld.static_state = static_state;
1260 bld.dynamic_state = dynamic_state;
1261 bld.format_desc = util_format_description(static_state->format);
1262 bld.coord_type = type;
1263 bld.uint_coord_type = lp_uint_type(type);
1264 bld.int_coord_type = lp_int_type(type);
1265 bld.texel_type = type;
1266 lp_build_context_init(&bld.coord_bld, builder, bld.coord_type);
1267 lp_build_context_init(&bld.uint_coord_bld, builder, bld.uint_coord_type);
1268 lp_build_context_init(&bld.int_coord_bld, builder, bld.int_coord_type);
1269 lp_build_context_init(&bld.texel_bld, builder, bld.texel_type);
1270
1271 /* Get the dynamic state */
1272 width = dynamic_state->width(dynamic_state, builder, unit);
1273 height = dynamic_state->height(dynamic_state, builder, unit);
1274 stride = dynamic_state->stride(dynamic_state, builder, unit);
1275 data_ptr = dynamic_state->data_ptr(dynamic_state, builder, unit);
1276
1277 s = coords[0];
1278 t = coords[1];
1279 r = coords[2];
1280
1281 width = lp_build_broadcast_scalar(&bld.uint_coord_bld, width);
1282 height = lp_build_broadcast_scalar(&bld.uint_coord_bld, height);
1283 stride = lp_build_broadcast_scalar(&bld.uint_coord_bld, stride);
1284
1285 if(static_state->target == PIPE_TEXTURE_1D)
1286 t = bld.coord_bld.zero;
1287
1288 switch (static_state->min_img_filter) {
1289 case PIPE_TEX_FILTER_NEAREST:
1290 lp_build_sample_2d_nearest_soa(&bld, s, t, width, height,
1291 stride, data_ptr, texel);
1292 break;
1293 case PIPE_TEX_FILTER_LINEAR:
1294 if(lp_format_is_rgba8(bld.format_desc) &&
1295 is_simple_wrap_mode(static_state->wrap_s) &&
1296 is_simple_wrap_mode(static_state->wrap_t))
1297 lp_build_sample_2d_linear_aos(&bld, s, t, width, height,
1298 stride, data_ptr, texel);
1299 else
1300 lp_build_sample_2d_linear_soa(&bld, s, t, width, height,
1301 stride, data_ptr, texel);
1302 break;
1303 default:
1304 assert(0);
1305 }
1306
1307 /* FIXME: respect static_state->min_mip_filter */;
1308 /* FIXME: respect static_state->mag_img_filter */;
1309
1310 lp_build_sample_compare(&bld, r, texel);
1311 }