1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
30 * Texture sampling -- SoA.
32 * @author Jose Fonseca <jfonseca@vmware.com>
33 * @author Brian Paul <brianp@vmware.com>
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 "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_bitarit.h"
49 #include "lp_bld_logic.h"
50 #include "lp_bld_printf.h"
51 #include "lp_bld_swizzle.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_sample_aos.h"
57 #include "lp_bld_struct.h"
58 #include "lp_bld_quad.h"
62 * Generate code to fetch a texel from a texture at int coords (x, y, z).
63 * The computation depends on whether the texture is 1D, 2D or 3D.
64 * The result, texel, will be float vectors:
65 * texel[0] = red values
66 * texel[1] = green values
67 * texel[2] = blue values
68 * texel[3] = alpha values
71 lp_build_sample_texel_soa(struct lp_build_sample_context
*bld
,
79 LLVMValueRef y_stride
,
80 LLVMValueRef z_stride
,
81 LLVMValueRef data_ptr
,
82 LLVMValueRef texel_out
[4])
84 const struct lp_sampler_static_state
*static_state
= bld
->static_state
;
85 const unsigned dims
= bld
->dims
;
86 struct lp_build_context
*int_coord_bld
= &bld
->int_coord_bld
;
87 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
90 LLVMValueRef use_border
= NULL
;
92 /* use_border = x < 0 || x >= width || y < 0 || y >= height */
93 if (lp_sampler_wrap_mode_uses_border_color(static_state
->wrap_s
,
94 static_state
->min_img_filter
,
95 static_state
->mag_img_filter
)) {
97 b1
= lp_build_cmp(int_coord_bld
, PIPE_FUNC_LESS
, x
, int_coord_bld
->zero
);
98 b2
= lp_build_cmp(int_coord_bld
, PIPE_FUNC_GEQUAL
, x
, width
);
99 use_border
= LLVMBuildOr(builder
, b1
, b2
, "b1_or_b2");
103 lp_sampler_wrap_mode_uses_border_color(static_state
->wrap_t
,
104 static_state
->min_img_filter
,
105 static_state
->mag_img_filter
)) {
107 b1
= lp_build_cmp(int_coord_bld
, PIPE_FUNC_LESS
, y
, int_coord_bld
->zero
);
108 b2
= lp_build_cmp(int_coord_bld
, PIPE_FUNC_GEQUAL
, y
, height
);
110 use_border
= LLVMBuildOr(builder
, use_border
, b1
, "ub_or_b1");
111 use_border
= LLVMBuildOr(builder
, use_border
, b2
, "ub_or_b2");
114 use_border
= LLVMBuildOr(builder
, b1
, b2
, "b1_or_b2");
119 lp_sampler_wrap_mode_uses_border_color(static_state
->wrap_r
,
120 static_state
->min_img_filter
,
121 static_state
->mag_img_filter
)) {
123 b1
= lp_build_cmp(int_coord_bld
, PIPE_FUNC_LESS
, z
, int_coord_bld
->zero
);
124 b2
= lp_build_cmp(int_coord_bld
, PIPE_FUNC_GEQUAL
, z
, depth
);
126 use_border
= LLVMBuildOr(builder
, use_border
, b1
, "ub_or_b1");
127 use_border
= LLVMBuildOr(builder
, use_border
, b2
, "ub_or_b2");
130 use_border
= LLVMBuildOr(builder
, b1
, b2
, "b1_or_b2");
134 /* convert x,y,z coords to linear offset from start of texture, in bytes */
135 lp_build_sample_offset(&bld
->int_coord_bld
,
137 x
, y
, z
, y_stride
, z_stride
,
141 /* If we can sample the border color, it means that texcoords may
142 * lie outside the bounds of the texture image. We need to do
143 * something to prevent reading out of bounds and causing a segfault.
145 * Simply AND the texture coords with !use_border. This will cause
146 * coords which are out of bounds to become zero. Zero's guaranteed
147 * to be inside the texture image.
149 offset
= lp_build_andnot(&bld
->int_coord_bld
, offset
, use_border
);
152 lp_build_fetch_rgba_soa(bld
->gallivm
,
160 * Note: if we find an app which frequently samples the texture border
161 * we might want to implement a true conditional here to avoid sampling
162 * the texture whenever possible (since that's quite a bit of code).
165 * texel = border_color;
168 * texel = sample_texture(coord);
170 * As it is now, we always sample the texture, then selectively replace
171 * the texel color results with the border color.
175 /* select texel color or border color depending on use_border */
176 LLVMValueRef border_color_ptr
=
177 bld
->dynamic_state
->border_color(bld
->dynamic_state
,
180 for (chan
= 0; chan
< 4; chan
++) {
181 LLVMValueRef border_chan
=
182 lp_build_array_get(bld
->gallivm
, border_color_ptr
,
183 lp_build_const_int32(bld
->gallivm
, chan
));
184 LLVMValueRef border_chan_vec
=
185 lp_build_broadcast_scalar(&bld
->float_vec_bld
, border_chan
);
186 texel_out
[chan
] = lp_build_select(&bld
->texel_bld
, use_border
,
187 border_chan_vec
, texel_out
[chan
]);
194 * Helper to compute the mirror function for the PIPE_WRAP_MIRROR modes.
197 lp_build_coord_mirror(struct lp_build_sample_context
*bld
,
200 struct lp_build_context
*coord_bld
= &bld
->coord_bld
;
201 struct lp_build_context
*int_coord_bld
= &bld
->int_coord_bld
;
202 LLVMValueRef fract
, flr
, isOdd
;
204 lp_build_ifloor_fract(coord_bld
, coord
, &flr
, &fract
);
206 /* isOdd = flr & 1 */
207 isOdd
= LLVMBuildAnd(bld
->gallivm
->builder
, flr
, int_coord_bld
->one
, "");
209 /* make coord positive or negative depending on isOdd */
210 coord
= lp_build_set_sign(coord_bld
, fract
, isOdd
);
212 /* convert isOdd to float */
213 isOdd
= lp_build_int_to_float(coord_bld
, isOdd
);
215 /* add isOdd to coord */
216 coord
= lp_build_add(coord_bld
, coord
, isOdd
);
223 * Build LLVM code for texture wrap mode for linear filtering.
224 * \param x0_out returns first integer texcoord
225 * \param x1_out returns second integer texcoord
226 * \param weight_out returns linear interpolation weight
229 lp_build_sample_wrap_linear(struct lp_build_sample_context
*bld
,
232 LLVMValueRef length_f
,
235 LLVMValueRef
*x0_out
,
236 LLVMValueRef
*x1_out
,
237 LLVMValueRef
*weight_out
)
239 struct lp_build_context
*coord_bld
= &bld
->coord_bld
;
240 struct lp_build_context
*int_coord_bld
= &bld
->int_coord_bld
;
241 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
242 LLVMValueRef half
= lp_build_const_vec(bld
->gallivm
, coord_bld
->type
, 0.5);
243 LLVMValueRef length_minus_one
= lp_build_sub(int_coord_bld
, length
, int_coord_bld
->one
);
244 LLVMValueRef coord0
, coord1
, weight
;
247 case PIPE_TEX_WRAP_REPEAT
:
248 /* mul by size and subtract 0.5 */
249 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
250 coord
= lp_build_sub(coord_bld
, coord
, half
);
251 /* convert to int, compute lerp weight */
252 lp_build_ifloor_fract(coord_bld
, coord
, &coord0
, &weight
);
255 coord1
= lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
);
256 coord0
= LLVMBuildAnd(builder
, coord0
, length_minus_one
, "");
257 coord1
= LLVMBuildAnd(builder
, coord1
, length_minus_one
, "");
260 /* Add a bias to the texcoord to handle negative coords */
261 LLVMValueRef bias
= lp_build_mul_imm(int_coord_bld
, length
, 1024);
263 coord0
= LLVMBuildAdd(builder
, coord0
, bias
, "");
264 coord0
= LLVMBuildURem(builder
, coord0
, length
, "");
265 mask
= lp_build_compare(bld
->gallivm
, int_coord_bld
->type
,
266 PIPE_FUNC_NOTEQUAL
, coord0
, length_minus_one
);
267 coord1
= LLVMBuildAnd(builder
,
268 lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
),
273 case PIPE_TEX_WRAP_CLAMP
:
274 if (bld
->static_state
->normalized_coords
) {
275 /* scale coord to length */
276 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
279 /* clamp to [0, length] */
280 coord
= lp_build_clamp(coord_bld
, coord
, coord_bld
->zero
, length_f
);
282 coord
= lp_build_sub(coord_bld
, coord
, half
);
284 /* convert to int, compute lerp weight */
285 lp_build_ifloor_fract(coord_bld
, coord
, &coord0
, &weight
);
286 coord1
= lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
);
289 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
291 struct lp_build_context abs_coord_bld
= bld
->coord_bld
;
292 abs_coord_bld
.type
.sign
= FALSE
;
294 if (bld
->static_state
->normalized_coords
) {
295 /* mul by tex size */
296 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
298 /* clamp to length max */
299 coord
= lp_build_min(coord_bld
, coord
, length_f
);
301 coord
= lp_build_sub(coord_bld
, coord
, half
);
302 /* clamp to [0, length - 0.5] */
303 coord
= lp_build_max(coord_bld
, coord
, coord_bld
->zero
);
304 /* convert to int, compute lerp weight */
305 lp_build_ifloor_fract(&abs_coord_bld
, coord
, &coord0
, &weight
);
306 coord1
= lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
);
307 /* coord1 = min(coord1, length-1) */
308 coord1
= lp_build_min(int_coord_bld
, coord1
, length_minus_one
);
312 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
315 if (bld
->static_state
->normalized_coords
) {
316 /* scale coord to length */
317 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
319 /* was: clamp to [-0.5, length + 0.5], then sub 0.5 */
320 coord
= lp_build_sub(coord_bld
, coord
, half
);
321 min
= lp_build_const_vec(bld
->gallivm
, coord_bld
->type
, -1.0F
);
322 coord
= lp_build_clamp(coord_bld
, coord
, min
, length_f
);
323 /* convert to int, compute lerp weight */
324 lp_build_ifloor_fract(coord_bld
, coord
, &coord0
, &weight
);
325 coord1
= lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
);
329 case PIPE_TEX_WRAP_MIRROR_REPEAT
:
330 /* compute mirror function */
331 coord
= lp_build_coord_mirror(bld
, coord
);
333 /* scale coord to length */
334 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
335 coord
= lp_build_sub(coord_bld
, coord
, half
);
337 /* convert to int, compute lerp weight */
338 lp_build_ifloor_fract(coord_bld
, coord
, &coord0
, &weight
);
339 coord1
= lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
);
341 /* coord0 = max(coord0, 0) */
342 coord0
= lp_build_max(int_coord_bld
, coord0
, int_coord_bld
->zero
);
343 /* coord1 = min(coord1, length-1) */
344 coord1
= lp_build_min(int_coord_bld
, coord1
, length_minus_one
);
347 case PIPE_TEX_WRAP_MIRROR_CLAMP
:
348 coord
= lp_build_abs(coord_bld
, coord
);
350 if (bld
->static_state
->normalized_coords
) {
351 /* scale coord to length */
352 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
355 /* clamp to [0, length] */
356 coord
= lp_build_min(coord_bld
, coord
, length_f
);
358 coord
= lp_build_sub(coord_bld
, coord
, half
);
360 /* convert to int, compute lerp weight */
361 lp_build_ifloor_fract(coord_bld
, coord
, &coord0
, &weight
);
362 coord1
= lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
);
365 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE
:
367 LLVMValueRef min
, max
;
368 struct lp_build_context abs_coord_bld
= bld
->coord_bld
;
369 abs_coord_bld
.type
.sign
= FALSE
;
370 coord
= lp_build_abs(coord_bld
, coord
);
372 if (bld
->static_state
->normalized_coords
) {
373 /* scale coord to length */
374 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
377 /* clamp to [0.5, length - 0.5] */
379 max
= lp_build_sub(coord_bld
, length_f
, min
);
380 coord
= lp_build_clamp(coord_bld
, coord
, min
, max
);
382 coord
= lp_build_sub(coord_bld
, coord
, half
);
384 /* convert to int, compute lerp weight */
385 lp_build_ifloor_fract(&abs_coord_bld
, coord
, &coord0
, &weight
);
386 coord1
= lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
);
390 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER
:
392 coord
= lp_build_abs(coord_bld
, coord
);
394 if (bld
->static_state
->normalized_coords
) {
395 /* scale coord to length */
396 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
399 /* was: clamp to [-0.5, length + 0.5] then sub 0.5 */
400 /* skip -0.5 clamp (always positive), do sub first */
401 coord
= lp_build_sub(coord_bld
, coord
, half
);
402 coord
= lp_build_min(coord_bld
, coord
, length_f
);
404 /* convert to int, compute lerp weight */
405 lp_build_ifloor_fract(coord_bld
, coord
, &coord0
, &weight
);
406 coord1
= lp_build_add(int_coord_bld
, coord0
, int_coord_bld
->one
);
419 *weight_out
= weight
;
424 * Build LLVM code for texture wrap mode for nearest filtering.
425 * \param coord the incoming texcoord (nominally in [0,1])
426 * \param length the texture size along one dimension, as int vector
427 * \param is_pot if TRUE, length is a power of two
428 * \param wrap_mode one of PIPE_TEX_WRAP_x
431 lp_build_sample_wrap_nearest(struct lp_build_sample_context
*bld
,
434 LLVMValueRef length_f
,
438 struct lp_build_context
*coord_bld
= &bld
->coord_bld
;
439 struct lp_build_context
*int_coord_bld
= &bld
->int_coord_bld
;
440 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
441 LLVMValueRef length_minus_one
= lp_build_sub(int_coord_bld
, length
, int_coord_bld
->one
);
445 case PIPE_TEX_WRAP_REPEAT
:
446 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
447 icoord
= lp_build_ifloor(coord_bld
, coord
);
449 icoord
= LLVMBuildAnd(builder
, icoord
, length_minus_one
, "");
451 /* Add a bias to the texcoord to handle negative coords */
452 LLVMValueRef bias
= lp_build_mul_imm(int_coord_bld
, length
, 1024);
453 icoord
= LLVMBuildAdd(builder
, icoord
, bias
, "");
454 icoord
= LLVMBuildURem(builder
, icoord
, length
, "");
458 case PIPE_TEX_WRAP_CLAMP
:
459 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
460 if (bld
->static_state
->normalized_coords
) {
461 /* scale coord to length */
462 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
466 /* use itrunc instead since we clamp to 0 anyway */
467 icoord
= lp_build_itrunc(coord_bld
, coord
);
469 /* clamp to [0, length - 1]. */
470 icoord
= lp_build_clamp(int_coord_bld
, icoord
, int_coord_bld
->zero
,
474 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
475 /* Note: this is the same as CLAMP_TO_EDGE, except min = -min */
477 LLVMValueRef min
, max
;
479 if (bld
->static_state
->normalized_coords
) {
480 /* scale coord to length */
481 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
484 icoord
= lp_build_ifloor(coord_bld
, coord
);
486 /* clamp to [-1, length] */
487 min
= lp_build_negate(int_coord_bld
, int_coord_bld
->one
);
489 icoord
= lp_build_clamp(int_coord_bld
, icoord
, min
, max
);
493 case PIPE_TEX_WRAP_MIRROR_REPEAT
:
494 /* compute mirror function */
495 coord
= lp_build_coord_mirror(bld
, coord
);
497 /* scale coord to length */
498 assert(bld
->static_state
->normalized_coords
);
499 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
501 /* itrunc == ifloor here */
502 icoord
= lp_build_itrunc(coord_bld
, coord
);
504 /* clamp to [0, length - 1] */
505 icoord
= lp_build_min(int_coord_bld
, icoord
, length_minus_one
);
508 case PIPE_TEX_WRAP_MIRROR_CLAMP
:
509 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE
:
510 coord
= lp_build_abs(coord_bld
, coord
);
512 if (bld
->static_state
->normalized_coords
) {
513 /* scale coord to length */
514 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
517 /* itrunc == ifloor here */
518 icoord
= lp_build_itrunc(coord_bld
, coord
);
520 /* clamp to [0, length - 1] */
521 icoord
= lp_build_min(int_coord_bld
, icoord
, length_minus_one
);
524 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER
:
525 coord
= lp_build_abs(coord_bld
, coord
);
527 if (bld
->static_state
->normalized_coords
) {
528 /* scale coord to length */
529 coord
= lp_build_mul(coord_bld
, coord
, length_f
);
532 /* itrunc == ifloor here */
533 icoord
= lp_build_itrunc(coord_bld
, coord
);
535 /* clamp to [0, length] */
536 icoord
= lp_build_min(int_coord_bld
, icoord
, length
);
549 * Generate code to sample a mipmap level with nearest filtering.
550 * If sampling a cube texture, r = cube face in [0,5].
553 lp_build_sample_image_nearest(struct lp_build_sample_context
*bld
,
556 LLVMValueRef row_stride_vec
,
557 LLVMValueRef img_stride_vec
,
558 LLVMValueRef data_ptr
,
562 LLVMValueRef colors_out
[4])
564 const unsigned dims
= bld
->dims
;
565 LLVMValueRef width_vec
;
566 LLVMValueRef height_vec
;
567 LLVMValueRef depth_vec
;
568 LLVMValueRef flt_size
;
569 LLVMValueRef flt_width_vec
;
570 LLVMValueRef flt_height_vec
;
571 LLVMValueRef flt_depth_vec
;
572 LLVMValueRef x
, y
, z
;
574 lp_build_extract_image_sizes(bld
,
578 &width_vec
, &height_vec
, &depth_vec
);
580 flt_size
= lp_build_int_to_float(&bld
->float_size_bld
, size
);
582 lp_build_extract_image_sizes(bld
,
583 bld
->float_size_type
,
586 &flt_width_vec
, &flt_height_vec
, &flt_depth_vec
);
589 * Compute integer texcoords.
591 x
= lp_build_sample_wrap_nearest(bld
, s
, width_vec
, flt_width_vec
,
592 bld
->static_state
->pot_width
,
593 bld
->static_state
->wrap_s
);
594 lp_build_name(x
, "tex.x.wrapped");
597 y
= lp_build_sample_wrap_nearest(bld
, t
, height_vec
, flt_height_vec
,
598 bld
->static_state
->pot_height
,
599 bld
->static_state
->wrap_t
);
600 lp_build_name(y
, "tex.y.wrapped");
603 z
= lp_build_sample_wrap_nearest(bld
, r
, depth_vec
, flt_depth_vec
,
604 bld
->static_state
->pot_depth
,
605 bld
->static_state
->wrap_r
);
606 lp_build_name(z
, "tex.z.wrapped");
608 else if (bld
->static_state
->target
== PIPE_TEXTURE_CUBE
) {
620 * Get texture colors.
622 lp_build_sample_texel_soa(bld
, unit
,
623 width_vec
, height_vec
, depth_vec
,
625 row_stride_vec
, img_stride_vec
,
626 data_ptr
, colors_out
);
631 * Generate code to sample a mipmap level with linear filtering.
632 * If sampling a cube texture, r = cube face in [0,5].
635 lp_build_sample_image_linear(struct lp_build_sample_context
*bld
,
638 LLVMValueRef row_stride_vec
,
639 LLVMValueRef img_stride_vec
,
640 LLVMValueRef data_ptr
,
644 LLVMValueRef colors_out
[4])
646 const unsigned dims
= bld
->dims
;
647 LLVMValueRef width_vec
;
648 LLVMValueRef height_vec
;
649 LLVMValueRef depth_vec
;
650 LLVMValueRef flt_size
;
651 LLVMValueRef flt_width_vec
;
652 LLVMValueRef flt_height_vec
;
653 LLVMValueRef flt_depth_vec
;
654 LLVMValueRef x0
, y0
, z0
, x1
, y1
, z1
;
655 LLVMValueRef s_fpart
, t_fpart
, r_fpart
;
656 LLVMValueRef neighbors
[2][2][4];
659 lp_build_extract_image_sizes(bld
,
663 &width_vec
, &height_vec
, &depth_vec
);
665 flt_size
= lp_build_int_to_float(&bld
->float_size_bld
, size
);
667 lp_build_extract_image_sizes(bld
,
668 bld
->float_size_type
,
671 &flt_width_vec
, &flt_height_vec
, &flt_depth_vec
);
674 * Compute integer texcoords.
676 lp_build_sample_wrap_linear(bld
, s
, width_vec
, flt_width_vec
,
677 bld
->static_state
->pot_width
,
678 bld
->static_state
->wrap_s
,
680 lp_build_name(x0
, "tex.x0.wrapped");
681 lp_build_name(x1
, "tex.x1.wrapped");
684 lp_build_sample_wrap_linear(bld
, t
, height_vec
, flt_height_vec
,
685 bld
->static_state
->pot_height
,
686 bld
->static_state
->wrap_t
,
688 lp_build_name(y0
, "tex.y0.wrapped");
689 lp_build_name(y1
, "tex.y1.wrapped");
692 lp_build_sample_wrap_linear(bld
, r
, depth_vec
, flt_depth_vec
,
693 bld
->static_state
->pot_depth
,
694 bld
->static_state
->wrap_r
,
696 lp_build_name(z0
, "tex.z0.wrapped");
697 lp_build_name(z1
, "tex.z1.wrapped");
699 else if (bld
->static_state
->target
== PIPE_TEXTURE_CUBE
) {
700 z0
= z1
= r
; /* cube face */
709 y0
= y1
= t_fpart
= NULL
;
710 z0
= z1
= r_fpart
= NULL
;
714 * Get texture colors.
716 /* get x0/x1 texels */
717 lp_build_sample_texel_soa(bld
, unit
,
718 width_vec
, height_vec
, depth_vec
,
720 row_stride_vec
, img_stride_vec
,
721 data_ptr
, neighbors
[0][0]);
722 lp_build_sample_texel_soa(bld
, unit
,
723 width_vec
, height_vec
, depth_vec
,
725 row_stride_vec
, img_stride_vec
,
726 data_ptr
, neighbors
[0][1]);
729 /* Interpolate two samples from 1D image to produce one color */
730 for (chan
= 0; chan
< 4; chan
++) {
731 colors_out
[chan
] = lp_build_lerp(&bld
->texel_bld
, s_fpart
,
732 neighbors
[0][0][chan
],
733 neighbors
[0][1][chan
]);
738 LLVMValueRef colors0
[4];
740 /* get x0/x1 texels at y1 */
741 lp_build_sample_texel_soa(bld
, unit
,
742 width_vec
, height_vec
, depth_vec
,
744 row_stride_vec
, img_stride_vec
,
745 data_ptr
, neighbors
[1][0]);
746 lp_build_sample_texel_soa(bld
, unit
,
747 width_vec
, height_vec
, depth_vec
,
749 row_stride_vec
, img_stride_vec
,
750 data_ptr
, neighbors
[1][1]);
752 /* Bilinear interpolate the four samples from the 2D image / 3D slice */
753 for (chan
= 0; chan
< 4; chan
++) {
754 colors0
[chan
] = lp_build_lerp_2d(&bld
->texel_bld
,
756 neighbors
[0][0][chan
],
757 neighbors
[0][1][chan
],
758 neighbors
[1][0][chan
],
759 neighbors
[1][1][chan
]);
763 LLVMValueRef neighbors1
[2][2][4];
764 LLVMValueRef colors1
[4];
766 /* get x0/x1/y0/y1 texels at z1 */
767 lp_build_sample_texel_soa(bld
, unit
,
768 width_vec
, height_vec
, depth_vec
,
770 row_stride_vec
, img_stride_vec
,
771 data_ptr
, neighbors1
[0][0]);
772 lp_build_sample_texel_soa(bld
, unit
,
773 width_vec
, height_vec
, depth_vec
,
775 row_stride_vec
, img_stride_vec
,
776 data_ptr
, neighbors1
[0][1]);
777 lp_build_sample_texel_soa(bld
, unit
,
778 width_vec
, height_vec
, depth_vec
,
780 row_stride_vec
, img_stride_vec
,
781 data_ptr
, neighbors1
[1][0]);
782 lp_build_sample_texel_soa(bld
, unit
,
783 width_vec
, height_vec
, depth_vec
,
785 row_stride_vec
, img_stride_vec
,
786 data_ptr
, neighbors1
[1][1]);
788 /* Bilinear interpolate the four samples from the second Z slice */
789 for (chan
= 0; chan
< 4; chan
++) {
790 colors1
[chan
] = lp_build_lerp_2d(&bld
->texel_bld
,
792 neighbors1
[0][0][chan
],
793 neighbors1
[0][1][chan
],
794 neighbors1
[1][0][chan
],
795 neighbors1
[1][1][chan
]);
798 /* Linearly interpolate the two samples from the two 3D slices */
799 for (chan
= 0; chan
< 4; chan
++) {
800 colors_out
[chan
] = lp_build_lerp(&bld
->texel_bld
,
802 colors0
[chan
], colors1
[chan
]);
807 for (chan
= 0; chan
< 4; chan
++) {
808 colors_out
[chan
] = colors0
[chan
];
816 * Sample the texture/mipmap using given image filter and mip filter.
817 * data0_ptr and data1_ptr point to the two mipmap levels to sample
818 * from. width0/1_vec, height0/1_vec, depth0/1_vec indicate their sizes.
819 * If we're using nearest miplevel sampling the '1' values will be null/unused.
822 lp_build_sample_mipmap(struct lp_build_sample_context
*bld
,
829 LLVMValueRef ilevel0
,
830 LLVMValueRef ilevel1
,
831 LLVMValueRef lod_fpart
,
832 LLVMValueRef
*colors_out
)
834 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
835 LLVMValueRef size0
= NULL
;
836 LLVMValueRef size1
= NULL
;
837 LLVMValueRef row_stride0_vec
= NULL
;
838 LLVMValueRef row_stride1_vec
= NULL
;
839 LLVMValueRef img_stride0_vec
= NULL
;
840 LLVMValueRef img_stride1_vec
= NULL
;
841 LLVMValueRef data_ptr0
= NULL
;
842 LLVMValueRef data_ptr1
= NULL
;
843 LLVMValueRef colors0
[4], colors1
[4];
846 /* sample the first mipmap level */
847 lp_build_mipmap_level_sizes(bld
, ilevel0
,
849 &row_stride0_vec
, &img_stride0_vec
);
850 data_ptr0
= lp_build_get_mipmap_level(bld
, ilevel0
);
851 if (img_filter
== PIPE_TEX_FILTER_NEAREST
) {
852 lp_build_sample_image_nearest(bld
, unit
,
854 row_stride0_vec
, img_stride0_vec
,
859 assert(img_filter
== PIPE_TEX_FILTER_LINEAR
);
860 lp_build_sample_image_linear(bld
, unit
,
862 row_stride0_vec
, img_stride0_vec
,
867 /* Store the first level's colors in the output variables */
868 for (chan
= 0; chan
< 4; chan
++) {
869 LLVMBuildStore(builder
, colors0
[chan
], colors_out
[chan
]);
872 if (mip_filter
== PIPE_TEX_MIPFILTER_LINEAR
) {
873 struct lp_build_if_state if_ctx
;
874 LLVMValueRef need_lerp
;
876 /* need_lerp = lod_fpart > 0 */
877 need_lerp
= LLVMBuildFCmp(builder
, LLVMRealUGT
,
882 lp_build_if(&if_ctx
, bld
->gallivm
, need_lerp
);
884 /* sample the second mipmap level */
885 lp_build_mipmap_level_sizes(bld
, ilevel1
,
887 &row_stride1_vec
, &img_stride1_vec
);
888 data_ptr1
= lp_build_get_mipmap_level(bld
, ilevel1
);
889 if (img_filter
== PIPE_TEX_FILTER_NEAREST
) {
890 lp_build_sample_image_nearest(bld
, unit
,
892 row_stride1_vec
, img_stride1_vec
,
897 lp_build_sample_image_linear(bld
, unit
,
899 row_stride1_vec
, img_stride1_vec
,
904 /* interpolate samples from the two mipmap levels */
906 lod_fpart
= lp_build_broadcast_scalar(&bld
->texel_bld
, lod_fpart
);
908 for (chan
= 0; chan
< 4; chan
++) {
909 colors0
[chan
] = lp_build_lerp(&bld
->texel_bld
, lod_fpart
,
910 colors0
[chan
], colors1
[chan
]);
911 LLVMBuildStore(builder
, colors0
[chan
], colors_out
[chan
]);
914 lp_build_endif(&if_ctx
);
921 * General texture sampling codegen.
922 * This function handles texture sampling for all texture targets (1D,
923 * 2D, 3D, cube) and all filtering modes.
926 lp_build_sample_general(struct lp_build_sample_context
*bld
,
931 const LLVMValueRef
*ddx
,
932 const LLVMValueRef
*ddy
,
933 LLVMValueRef lod_bias
, /* optional */
934 LLVMValueRef explicit_lod
, /* optional */
935 LLVMValueRef
*colors_out
)
937 struct lp_build_context
*int_bld
= &bld
->int_bld
;
938 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
939 const unsigned mip_filter
= bld
->static_state
->min_mip_filter
;
940 const unsigned min_filter
= bld
->static_state
->min_img_filter
;
941 const unsigned mag_filter
= bld
->static_state
->mag_img_filter
;
942 LLVMValueRef lod_ipart
= NULL
, lod_fpart
= NULL
;
943 LLVMValueRef ilevel0
, ilevel1
= NULL
;
944 LLVMValueRef face_ddx
[4], face_ddy
[4];
945 LLVMValueRef texels
[4];
946 LLVMValueRef i32t_zero
= lp_build_const_int32(bld
->gallivm
, 0);
950 printf("%s mip %d min %d mag %d\n", __FUNCTION__,
951 mip_filter, min_filter, mag_filter);
955 * Choose cube face, recompute texcoords and derivatives for the chosen face.
957 if (bld
->static_state
->target
== PIPE_TEXTURE_CUBE
) {
958 LLVMValueRef face
, face_s
, face_t
;
959 lp_build_cube_lookup(bld
, s
, t
, r
, &face
, &face_s
, &face_t
);
960 s
= face_s
; /* vec */
961 t
= face_t
; /* vec */
962 /* use 'r' to indicate cube face */
963 r
= lp_build_broadcast_scalar(&bld
->int_coord_bld
, face
); /* vec */
965 /* recompute ddx, ddy using the new (s,t) face texcoords */
966 face_ddx
[0] = lp_build_scalar_ddx(&bld
->coord_bld
, s
);
967 face_ddx
[1] = lp_build_scalar_ddx(&bld
->coord_bld
, t
);
970 face_ddy
[0] = lp_build_scalar_ddy(&bld
->coord_bld
, s
);
971 face_ddy
[1] = lp_build_scalar_ddy(&bld
->coord_bld
, t
);
979 * Compute the level of detail (float).
981 if (min_filter
!= mag_filter
||
982 mip_filter
!= PIPE_TEX_MIPFILTER_NONE
) {
983 /* Need to compute lod either to choose mipmap levels or to
984 * distinguish between minification/magnification with one mipmap level.
986 lp_build_lod_selector(bld
, unit
, ddx
, ddy
,
987 lod_bias
, explicit_lod
,
989 &lod_ipart
, &lod_fpart
);
991 lod_ipart
= i32t_zero
;
995 * Compute integer mipmap level(s) to fetch texels from: ilevel0, ilevel1
997 switch (mip_filter
) {
999 assert(0 && "bad mip_filter value in lp_build_sample_soa()");
1001 case PIPE_TEX_MIPFILTER_NONE
:
1002 /* always use mip level 0 */
1003 if (bld
->static_state
->target
== PIPE_TEXTURE_CUBE
) {
1004 /* XXX this is a work-around for an apparent bug in LLVM 2.7.
1005 * We should be able to set ilevel0 = const(0) but that causes
1006 * bad x86 code to be emitted.
1009 lp_build_nearest_mip_level(bld
, unit
, lod_ipart
, &ilevel0
);
1012 ilevel0
= i32t_zero
;
1015 case PIPE_TEX_MIPFILTER_NEAREST
:
1017 lp_build_nearest_mip_level(bld
, unit
, lod_ipart
, &ilevel0
);
1019 case PIPE_TEX_MIPFILTER_LINEAR
:
1022 lp_build_linear_mip_levels(bld
, unit
,
1023 lod_ipart
, &lod_fpart
,
1024 &ilevel0
, &ilevel1
);
1029 * Get/interpolate texture colors.
1032 for (chan
= 0; chan
< 4; ++chan
) {
1033 texels
[chan
] = lp_build_alloca(bld
->gallivm
, bld
->texel_bld
.vec_type
, "");
1034 lp_build_name(texels
[chan
], "sampler%u_texel_%c_var", unit
, "xyzw"[chan
]);
1037 if (min_filter
== mag_filter
) {
1038 /* no need to distinquish between minification and magnification */
1039 lp_build_sample_mipmap(bld
, unit
,
1040 min_filter
, mip_filter
,
1042 ilevel0
, ilevel1
, lod_fpart
,
1046 /* Emit conditional to choose min image filter or mag image filter
1047 * depending on the lod being > 0 or <= 0, respectively.
1049 struct lp_build_if_state if_ctx
;
1050 LLVMValueRef minify
;
1052 /* minify = lod >= 0.0 */
1053 minify
= LLVMBuildICmp(builder
, LLVMIntSGE
,
1054 lod_ipart
, int_bld
->zero
, "");
1056 lp_build_if(&if_ctx
, bld
->gallivm
, minify
);
1058 /* Use the minification filter */
1059 lp_build_sample_mipmap(bld
, unit
,
1060 min_filter
, mip_filter
,
1062 ilevel0
, ilevel1
, lod_fpart
,
1065 lp_build_else(&if_ctx
);
1067 /* Use the magnification filter */
1068 lp_build_sample_mipmap(bld
, unit
,
1069 mag_filter
, PIPE_TEX_MIPFILTER_NONE
,
1071 i32t_zero
, NULL
, NULL
,
1074 lp_build_endif(&if_ctx
);
1077 for (chan
= 0; chan
< 4; ++chan
) {
1078 colors_out
[chan
] = LLVMBuildLoad(builder
, texels
[chan
], "");
1079 lp_build_name(colors_out
[chan
], "sampler%u_texel_%c", unit
, "xyzw"[chan
]);
1085 * Do shadow test/comparison.
1086 * \param p the texcoord Z (aka R, aka P) component
1087 * \param texel the texel to compare against (use the X channel)
1090 lp_build_sample_compare(struct lp_build_sample_context
*bld
,
1092 LLVMValueRef texel
[4])
1094 struct lp_build_context
*texel_bld
= &bld
->texel_bld
;
1095 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
1097 const unsigned chan
= 0;
1099 if (bld
->static_state
->compare_mode
== PIPE_TEX_COMPARE_NONE
)
1104 LLVMValueRef indx
= lp_build_const_int32(bld
->gallivm
, 0);
1105 LLVMValueRef coord
= LLVMBuildExtractElement(builder
, p
, indx
, "");
1106 LLVMValueRef tex
= LLVMBuildExtractElement(builder
, texel
[chan
], indx
, "");
1107 lp_build_printf(bld
->gallivm
, "shadow compare coord %f to texture %f\n",
1111 /* Clamp p coords to [0,1] */
1112 p
= lp_build_clamp(&bld
->coord_bld
, p
,
1113 bld
->coord_bld
.zero
,
1114 bld
->coord_bld
.one
);
1116 /* result = (p FUNC texel) ? 1 : 0 */
1117 res
= lp_build_cmp(texel_bld
, bld
->static_state
->compare_func
,
1119 res
= lp_build_select(texel_bld
, res
, texel_bld
->one
, texel_bld
->zero
);
1121 /* XXX returning result for default GL_DEPTH_TEXTURE_MODE = GL_LUMINANCE */
1125 texel
[3] = texel_bld
->one
;
1130 * Just set texels to white instead of actually sampling the texture.
1134 lp_build_sample_nop(struct gallivm_state
*gallivm
, struct lp_type type
,
1135 LLVMValueRef texel_out
[4])
1137 LLVMValueRef one
= lp_build_one(gallivm
, type
);
1140 for (chan
= 0; chan
< 4; chan
++) {
1141 texel_out
[chan
] = one
;
1147 * Build texture sampling code.
1148 * 'texel' will return a vector of four LLVMValueRefs corresponding to
1150 * \param type vector float type to use for coords, etc.
1151 * \param ddx partial derivatives of (s,t,r,q) with respect to x
1152 * \param ddy partial derivatives of (s,t,r,q) with respect to y
1155 lp_build_sample_soa(struct gallivm_state
*gallivm
,
1156 const struct lp_sampler_static_state
*static_state
,
1157 struct lp_sampler_dynamic_state
*dynamic_state
,
1158 struct lp_type type
,
1160 unsigned num_coords
,
1161 const LLVMValueRef
*coords
,
1162 const LLVMValueRef ddx
[4],
1163 const LLVMValueRef ddy
[4],
1164 LLVMValueRef lod_bias
, /* optional */
1165 LLVMValueRef explicit_lod
, /* optional */
1166 LLVMValueRef texel_out
[4])
1168 unsigned dims
= texture_dims(static_state
->target
);
1169 struct lp_build_sample_context bld
;
1170 LLVMTypeRef i32t
= LLVMInt32TypeInContext(gallivm
->context
);
1171 LLVMBuilderRef builder
= gallivm
->builder
;
1175 struct lp_type float_vec_type
;
1178 enum pipe_format fmt
= static_state
->format
;
1179 debug_printf("Sample from %s\n", util_format_name(fmt
));
1182 assert(type
.floating
);
1184 /* Setup our build context */
1185 memset(&bld
, 0, sizeof bld
);
1186 bld
.gallivm
= gallivm
;
1187 bld
.static_state
= static_state
;
1188 bld
.dynamic_state
= dynamic_state
;
1189 bld
.format_desc
= util_format_description(static_state
->format
);
1192 bld
.float_type
= lp_type_float(32);
1193 bld
.int_type
= lp_type_int(32);
1194 bld
.coord_type
= type
;
1195 bld
.int_coord_type
= lp_int_type(type
);
1196 bld
.float_size_type
= lp_type_float(32);
1197 bld
.float_size_type
.length
= dims
> 1 ? 4 : 1;
1198 bld
.int_size_type
= lp_int_type(bld
.float_size_type
);
1199 bld
.texel_type
= type
;
1201 float_vec_type
= lp_type_float_vec(32);
1203 lp_build_context_init(&bld
.float_bld
, gallivm
, bld
.float_type
);
1204 lp_build_context_init(&bld
.float_vec_bld
, gallivm
, float_vec_type
);
1205 lp_build_context_init(&bld
.int_bld
, gallivm
, bld
.int_type
);
1206 lp_build_context_init(&bld
.coord_bld
, gallivm
, bld
.coord_type
);
1207 lp_build_context_init(&bld
.int_coord_bld
, gallivm
, bld
.int_coord_type
);
1208 lp_build_context_init(&bld
.int_size_bld
, gallivm
, bld
.int_size_type
);
1209 lp_build_context_init(&bld
.float_size_bld
, gallivm
, bld
.float_size_type
);
1210 lp_build_context_init(&bld
.texel_bld
, gallivm
, bld
.texel_type
);
1212 /* Get the dynamic state */
1213 bld
.width
= dynamic_state
->width(dynamic_state
, gallivm
, unit
);
1214 bld
.height
= dynamic_state
->height(dynamic_state
, gallivm
, unit
);
1215 bld
.depth
= dynamic_state
->depth(dynamic_state
, gallivm
, unit
);
1216 bld
.row_stride_array
= dynamic_state
->row_stride(dynamic_state
, gallivm
, unit
);
1217 bld
.img_stride_array
= dynamic_state
->img_stride(dynamic_state
, gallivm
, unit
);
1218 bld
.data_array
= dynamic_state
->data_ptr(dynamic_state
, gallivm
, unit
);
1219 /* Note that data_array is an array[level] of pointers to texture images */
1225 /* width, height, depth as single int vector */
1227 bld
.int_size
= bld
.width
;
1230 bld
.int_size
= LLVMBuildInsertElement(builder
, bld
.int_size_bld
.undef
,
1231 bld
.width
, LLVMConstInt(i32t
, 0, 0), "");
1233 bld
.int_size
= LLVMBuildInsertElement(builder
, bld
.int_size
,
1234 bld
.height
, LLVMConstInt(i32t
, 1, 0), "");
1236 bld
.int_size
= LLVMBuildInsertElement(builder
, bld
.int_size
,
1237 bld
.depth
, LLVMConstInt(i32t
, 2, 0), "");
1243 /* For debug: no-op texture sampling */
1244 lp_build_sample_nop(gallivm
, bld
.texel_type
, texel_out
);
1246 else if (util_format_fits_8unorm(bld
.format_desc
) &&
1247 lp_is_simple_wrap_mode(static_state
->wrap_s
) &&
1248 lp_is_simple_wrap_mode(static_state
->wrap_t
)) {
1249 /* do sampling/filtering with fixed pt arithmetic */
1250 lp_build_sample_aos(&bld
, unit
, s
, t
, r
, ddx
, ddy
,
1251 lod_bias
, explicit_lod
,
1256 if ((gallivm_debug
& GALLIVM_DEBUG_PERF
) &&
1257 util_format_fits_8unorm(bld
.format_desc
)) {
1258 debug_printf("%s: using floating point linear filtering for %s\n",
1259 __FUNCTION__
, bld
.format_desc
->short_name
);
1260 debug_printf(" min_img %d mag_img %d mip %d wraps %d wrapt %d\n",
1261 static_state
->min_img_filter
,
1262 static_state
->mag_img_filter
,
1263 static_state
->min_mip_filter
,
1264 static_state
->wrap_s
,
1265 static_state
->wrap_t
);
1268 lp_build_sample_general(&bld
, unit
, s
, t
, r
, ddx
, ddy
,
1269 lod_bias
, explicit_lod
,
1273 lp_build_sample_compare(&bld
, r
, texel_out
);
1275 apply_sampler_swizzle(&bld
, texel_out
);