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 -- common code.
32 * @author Jose Fonseca <jfonseca@vmware.com>
35 #include "pipe/p_defines.h"
36 #include "pipe/p_state.h"
37 #include "util/u_format.h"
38 #include "util/u_math.h"
39 #include "util/u_cpu_detect.h"
40 #include "lp_bld_arit.h"
41 #include "lp_bld_const.h"
42 #include "lp_bld_debug.h"
43 #include "lp_bld_printf.h"
44 #include "lp_bld_flow.h"
45 #include "lp_bld_sample.h"
46 #include "lp_bld_swizzle.h"
47 #include "lp_bld_type.h"
48 #include "lp_bld_logic.h"
49 #include "lp_bld_pack.h"
50 #include "lp_bld_quad.h"
51 #include "lp_bld_bitarit.h"
55 * Bri-linear factor. Should be greater than one.
57 #define BRILINEAR_FACTOR 2
60 * Does the given texture wrap mode allow sampling the texture border color?
61 * XXX maybe move this into gallium util code.
64 lp_sampler_wrap_mode_uses_border_color(unsigned mode
,
65 unsigned min_img_filter
,
66 unsigned mag_img_filter
)
69 case PIPE_TEX_WRAP_REPEAT
:
70 case PIPE_TEX_WRAP_CLAMP_TO_EDGE
:
71 case PIPE_TEX_WRAP_MIRROR_REPEAT
:
72 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE
:
74 case PIPE_TEX_WRAP_CLAMP
:
75 case PIPE_TEX_WRAP_MIRROR_CLAMP
:
76 if (min_img_filter
== PIPE_TEX_FILTER_NEAREST
&&
77 mag_img_filter
== PIPE_TEX_FILTER_NEAREST
) {
82 case PIPE_TEX_WRAP_CLAMP_TO_BORDER
:
83 case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER
:
86 assert(0 && "unexpected wrap mode");
93 * Initialize lp_sampler_static_texture_state object with the gallium
94 * texture/sampler_view state (this contains the parts which are
98 lp_sampler_static_texture_state(struct lp_static_texture_state
*state
,
99 const struct pipe_sampler_view
*view
)
101 const struct pipe_resource
*texture
;
103 memset(state
, 0, sizeof *state
);
105 if (!view
|| !view
->texture
)
108 texture
= view
->texture
;
110 state
->format
= view
->format
;
111 state
->swizzle_r
= view
->swizzle_r
;
112 state
->swizzle_g
= view
->swizzle_g
;
113 state
->swizzle_b
= view
->swizzle_b
;
114 state
->swizzle_a
= view
->swizzle_a
;
116 state
->target
= texture
->target
;
117 state
->pot_width
= util_is_power_of_two(texture
->width0
);
118 state
->pot_height
= util_is_power_of_two(texture
->height0
);
119 state
->pot_depth
= util_is_power_of_two(texture
->depth0
);
120 state
->level_zero_only
= !view
->u
.tex
.last_level
;
123 * the layer / element / level parameters are all either dynamic
124 * state or handled transparently wrt execution.
130 * Initialize lp_sampler_static_sampler_state object with the gallium sampler
131 * state (this contains the parts which are considered static).
134 lp_sampler_static_sampler_state(struct lp_static_sampler_state
*state
,
135 const struct pipe_sampler_state
*sampler
)
137 memset(state
, 0, sizeof *state
);
143 * We don't copy sampler state over unless it is actually enabled, to avoid
144 * spurious recompiles, as the sampler static state is part of the shader
147 * Ideally the state tracker or cso_cache module would make all state
148 * canonical, but until that happens it's better to be safe than sorry here.
150 * XXX: Actually there's much more than can be done here, especially
151 * regarding 1D/2D/3D/CUBE textures, wrap modes, etc.
154 state
->wrap_s
= sampler
->wrap_s
;
155 state
->wrap_t
= sampler
->wrap_t
;
156 state
->wrap_r
= sampler
->wrap_r
;
157 state
->min_img_filter
= sampler
->min_img_filter
;
158 state
->mag_img_filter
= sampler
->mag_img_filter
;
159 state
->seamless_cube_map
= sampler
->seamless_cube_map
;
161 if (sampler
->max_lod
> 0.0f
) {
162 state
->min_mip_filter
= sampler
->min_mip_filter
;
164 state
->min_mip_filter
= PIPE_TEX_MIPFILTER_NONE
;
167 if (state
->min_mip_filter
!= PIPE_TEX_MIPFILTER_NONE
||
168 state
->min_img_filter
!= state
->mag_img_filter
) {
169 if (sampler
->lod_bias
!= 0.0f
) {
170 state
->lod_bias_non_zero
= 1;
173 /* If min_lod == max_lod we can greatly simplify mipmap selection.
174 * This is a case that occurs during automatic mipmap generation.
176 if (sampler
->min_lod
== sampler
->max_lod
) {
177 state
->min_max_lod_equal
= 1;
179 if (sampler
->min_lod
> 0.0f
) {
180 state
->apply_min_lod
= 1;
184 * XXX this won't do anything with the mesa state tracker which always
185 * sets max_lod to not more than actually present mip maps...
187 if (sampler
->max_lod
< (PIPE_MAX_TEXTURE_LEVELS
- 1)) {
188 state
->apply_max_lod
= 1;
193 state
->compare_mode
= sampler
->compare_mode
;
194 if (sampler
->compare_mode
!= PIPE_TEX_COMPARE_NONE
) {
195 state
->compare_func
= sampler
->compare_func
;
198 state
->normalized_coords
= sampler
->normalized_coords
;
203 * Generate code to compute coordinate gradient (rho).
204 * \param derivs partial derivatives of (s, t, r, q) with respect to X and Y
206 * The resulting rho has bld->levelf format (per quad or per element).
209 lp_build_rho(struct lp_build_sample_context
*bld
,
210 unsigned texture_unit
,
214 LLVMValueRef cube_rho
,
215 const struct lp_derivatives
*derivs
)
217 struct gallivm_state
*gallivm
= bld
->gallivm
;
218 struct lp_build_context
*int_size_bld
= &bld
->int_size_in_bld
;
219 struct lp_build_context
*float_size_bld
= &bld
->float_size_in_bld
;
220 struct lp_build_context
*float_bld
= &bld
->float_bld
;
221 struct lp_build_context
*coord_bld
= &bld
->coord_bld
;
222 struct lp_build_context
*rho_bld
= &bld
->lodf_bld
;
223 const unsigned dims
= bld
->dims
;
224 LLVMValueRef ddx_ddy
[2];
225 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
226 LLVMTypeRef i32t
= LLVMInt32TypeInContext(bld
->gallivm
->context
);
227 LLVMValueRef index0
= LLVMConstInt(i32t
, 0, 0);
228 LLVMValueRef index1
= LLVMConstInt(i32t
, 1, 0);
229 LLVMValueRef index2
= LLVMConstInt(i32t
, 2, 0);
230 LLVMValueRef rho_vec
;
231 LLVMValueRef int_size
, float_size
;
233 LLVMValueRef first_level
, first_level_vec
;
234 unsigned length
= coord_bld
->type
.length
;
235 unsigned num_quads
= length
/ 4;
236 boolean rho_per_quad
= rho_bld
->type
.length
!= length
;
237 boolean no_rho_opt
= (gallivm_debug
& GALLIVM_DEBUG_NO_RHO_APPROX
) && (dims
> 1);
239 LLVMValueRef i32undef
= LLVMGetUndef(LLVMInt32TypeInContext(gallivm
->context
));
240 LLVMValueRef rho_xvec
, rho_yvec
;
242 /* Note that all simplified calculations will only work for isotropic filtering */
245 * rho calcs are always per quad except for explicit derivs (excluding
246 * the messy cube maps for now) when requested.
249 first_level
= bld
->dynamic_state
->first_level(bld
->dynamic_state
,
250 bld
->gallivm
, texture_unit
);
251 first_level_vec
= lp_build_broadcast_scalar(int_size_bld
, first_level
);
252 int_size
= lp_build_minify(int_size_bld
, bld
->int_size
, first_level_vec
, TRUE
);
253 float_size
= lp_build_int_to_float(float_size_bld
, int_size
);
256 LLVMValueRef cubesize
;
257 LLVMValueRef index0
= lp_build_const_int32(gallivm
, 0);
260 * Cube map code did already everything except size mul and per-quad extraction.
261 * Luckily cube maps are always quadratic!
264 rho
= lp_build_pack_aos_scalars(bld
->gallivm
, coord_bld
->type
,
265 rho_bld
->type
, cube_rho
, 0);
268 rho
= lp_build_swizzle_scalar_aos(coord_bld
, cube_rho
, 0, 4);
270 /* Could optimize this for single quad just skip the broadcast */
271 cubesize
= lp_build_extract_broadcast(gallivm
, bld
->float_size_in_type
,
272 rho_bld
->type
, float_size
, index0
);
273 /* skipping sqrt hence returning rho squared */
274 cubesize
= lp_build_mul(rho_bld
, cubesize
, cubesize
);
275 rho
= lp_build_mul(rho_bld
, cubesize
, rho
);
278 LLVMValueRef ddmax
[3], ddx
[3], ddy
[3];
279 for (i
= 0; i
< dims
; i
++) {
280 LLVMValueRef floatdim
;
281 LLVMValueRef indexi
= lp_build_const_int32(gallivm
, i
);
283 floatdim
= lp_build_extract_broadcast(gallivm
, bld
->float_size_in_type
,
284 coord_bld
->type
, float_size
, indexi
);
287 * note that for rho_per_quad case could reduce math (at some shuffle
288 * cost), but for now use same code to per-pixel lod case.
291 ddx
[i
] = lp_build_mul(coord_bld
, floatdim
, derivs
->ddx
[i
]);
292 ddy
[i
] = lp_build_mul(coord_bld
, floatdim
, derivs
->ddy
[i
]);
293 ddx
[i
] = lp_build_mul(coord_bld
, ddx
[i
], ddx
[i
]);
294 ddy
[i
] = lp_build_mul(coord_bld
, ddy
[i
], ddy
[i
]);
297 LLVMValueRef tmpx
, tmpy
;
298 tmpx
= lp_build_abs(coord_bld
, derivs
->ddx
[i
]);
299 tmpy
= lp_build_abs(coord_bld
, derivs
->ddy
[i
]);
300 ddmax
[i
] = lp_build_max(coord_bld
, tmpx
, tmpy
);
301 ddmax
[i
] = lp_build_mul(coord_bld
, floatdim
, ddmax
[i
]);
305 rho_xvec
= lp_build_add(coord_bld
, ddx
[0], ddx
[1]);
306 rho_yvec
= lp_build_add(coord_bld
, ddy
[0], ddy
[1]);
308 rho_xvec
= lp_build_add(coord_bld
, rho_xvec
, ddx
[2]);
309 rho_yvec
= lp_build_add(coord_bld
, rho_yvec
, ddy
[2]);
311 rho
= lp_build_max(coord_bld
, rho_xvec
, rho_yvec
);
312 /* skipping sqrt hence returning rho squared */
317 rho
= lp_build_max(coord_bld
, rho
, ddmax
[1]);
319 rho
= lp_build_max(coord_bld
, rho
, ddmax
[2]);
325 * rho_vec contains per-pixel rho, convert to scalar per quad.
327 rho
= lp_build_pack_aos_scalars(bld
->gallivm
, coord_bld
->type
,
328 rho_bld
->type
, rho
, 0);
333 * This looks all a bit complex, but it's not that bad
334 * (the shuffle code makes it look worse than it is).
335 * Still, might not be ideal for all cases.
337 static const unsigned char swizzle0
[] = { /* no-op swizzle */
338 0, LP_BLD_SWIZZLE_DONTCARE
,
339 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
341 static const unsigned char swizzle1
[] = {
342 1, LP_BLD_SWIZZLE_DONTCARE
,
343 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
345 static const unsigned char swizzle2
[] = {
346 2, LP_BLD_SWIZZLE_DONTCARE
,
347 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
351 ddx_ddy
[0] = lp_build_packed_ddx_ddy_onecoord(coord_bld
, s
);
353 else if (dims
>= 2) {
354 ddx_ddy
[0] = lp_build_packed_ddx_ddy_twocoord(coord_bld
, s
, t
);
356 ddx_ddy
[1] = lp_build_packed_ddx_ddy_onecoord(coord_bld
, r
);
361 static const unsigned char swizzle01
[] = { /* no-op swizzle */
363 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
365 static const unsigned char swizzle23
[] = {
367 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
369 LLVMValueRef ddx_ddys
, ddx_ddyt
, floatdim
, shuffles
[LP_MAX_VECTOR_LENGTH
/ 4];
371 for (i
= 0; i
< num_quads
; i
++) {
372 shuffles
[i
*4+0] = shuffles
[i
*4+1] = index0
;
373 shuffles
[i
*4+2] = shuffles
[i
*4+3] = index1
;
375 floatdim
= LLVMBuildShuffleVector(builder
, float_size
, float_size
,
376 LLVMConstVector(shuffles
, length
), "");
377 ddx_ddy
[0] = lp_build_mul(coord_bld
, ddx_ddy
[0], floatdim
);
378 ddx_ddy
[0] = lp_build_mul(coord_bld
, ddx_ddy
[0], ddx_ddy
[0]);
379 ddx_ddys
= lp_build_swizzle_aos(coord_bld
, ddx_ddy
[0], swizzle01
);
380 ddx_ddyt
= lp_build_swizzle_aos(coord_bld
, ddx_ddy
[0], swizzle23
);
381 rho_vec
= lp_build_add(coord_bld
, ddx_ddys
, ddx_ddyt
);
384 static const unsigned char swizzle02
[] = {
386 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
388 floatdim
= lp_build_extract_broadcast(gallivm
, bld
->float_size_in_type
,
389 coord_bld
->type
, float_size
, index2
);
390 ddx_ddy
[1] = lp_build_mul(coord_bld
, ddx_ddy
[1], floatdim
);
391 ddx_ddy
[1] = lp_build_mul(coord_bld
, ddx_ddy
[1], ddx_ddy
[1]);
392 ddx_ddy
[1] = lp_build_swizzle_aos(coord_bld
, ddx_ddy
[1], swizzle02
);
393 rho_vec
= lp_build_add(coord_bld
, rho_vec
, ddx_ddy
[1]);
396 rho_xvec
= lp_build_swizzle_aos(coord_bld
, rho_vec
, swizzle0
);
397 rho_yvec
= lp_build_swizzle_aos(coord_bld
, rho_vec
, swizzle1
);
398 rho
= lp_build_max(coord_bld
, rho_xvec
, rho_yvec
);
401 rho
= lp_build_pack_aos_scalars(bld
->gallivm
, coord_bld
->type
,
402 rho_bld
->type
, rho
, 0);
405 rho
= lp_build_swizzle_scalar_aos(coord_bld
, rho
, 0, 4);
407 /* skipping sqrt hence returning rho squared */
410 ddx_ddy
[0] = lp_build_abs(coord_bld
, ddx_ddy
[0]);
412 ddx_ddy
[1] = lp_build_abs(coord_bld
, ddx_ddy
[1]);
416 rho_xvec
= lp_build_swizzle_aos(coord_bld
, ddx_ddy
[0], swizzle0
);
417 rho_yvec
= lp_build_swizzle_aos(coord_bld
, ddx_ddy
[0], swizzle2
);
419 else if (dims
== 2) {
420 static const unsigned char swizzle02
[] = {
422 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
424 static const unsigned char swizzle13
[] = {
426 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
428 rho_xvec
= lp_build_swizzle_aos(coord_bld
, ddx_ddy
[0], swizzle02
);
429 rho_yvec
= lp_build_swizzle_aos(coord_bld
, ddx_ddy
[0], swizzle13
);
432 LLVMValueRef shuffles1
[LP_MAX_VECTOR_LENGTH
];
433 LLVMValueRef shuffles2
[LP_MAX_VECTOR_LENGTH
];
435 for (i
= 0; i
< num_quads
; i
++) {
436 shuffles1
[4*i
+ 0] = lp_build_const_int32(gallivm
, 4*i
);
437 shuffles1
[4*i
+ 1] = lp_build_const_int32(gallivm
, 4*i
+ 2);
438 shuffles1
[4*i
+ 2] = lp_build_const_int32(gallivm
, length
+ 4*i
);
439 shuffles1
[4*i
+ 3] = i32undef
;
440 shuffles2
[4*i
+ 0] = lp_build_const_int32(gallivm
, 4*i
+ 1);
441 shuffles2
[4*i
+ 1] = lp_build_const_int32(gallivm
, 4*i
+ 3);
442 shuffles2
[4*i
+ 2] = lp_build_const_int32(gallivm
, length
+ 4*i
+ 2);
443 shuffles2
[4*i
+ 3] = i32undef
;
445 rho_xvec
= LLVMBuildShuffleVector(builder
, ddx_ddy
[0], ddx_ddy
[1],
446 LLVMConstVector(shuffles1
, length
), "");
447 rho_yvec
= LLVMBuildShuffleVector(builder
, ddx_ddy
[0], ddx_ddy
[1],
448 LLVMConstVector(shuffles2
, length
), "");
451 rho_vec
= lp_build_max(coord_bld
, rho_xvec
, rho_yvec
);
453 if (bld
->coord_type
.length
> 4) {
454 /* expand size to each quad */
456 /* could use some broadcast_vector helper for this? */
457 LLVMValueRef src
[LP_MAX_VECTOR_LENGTH
/4];
458 for (i
= 0; i
< num_quads
; i
++) {
461 float_size
= lp_build_concat(bld
->gallivm
, src
, float_size_bld
->type
, num_quads
);
464 float_size
= lp_build_broadcast_scalar(coord_bld
, float_size
);
466 rho_vec
= lp_build_mul(coord_bld
, rho_vec
, float_size
);
473 LLVMValueRef rho_s
, rho_t
, rho_r
;
475 rho_s
= lp_build_swizzle_aos(coord_bld
, rho_vec
, swizzle0
);
476 rho_t
= lp_build_swizzle_aos(coord_bld
, rho_vec
, swizzle1
);
478 rho
= lp_build_max(coord_bld
, rho_s
, rho_t
);
481 rho_r
= lp_build_swizzle_aos(coord_bld
, rho_vec
, swizzle2
);
482 rho
= lp_build_max(coord_bld
, rho
, rho_r
);
487 rho
= lp_build_pack_aos_scalars(bld
->gallivm
, coord_bld
->type
,
488 rho_bld
->type
, rho
, 0);
491 rho
= lp_build_swizzle_scalar_aos(coord_bld
, rho
, 0, 4);
496 rho_vec
= LLVMBuildExtractElement(builder
, rho_vec
, index0
, "");
498 rho_vec
= lp_build_mul(float_size_bld
, rho_vec
, float_size
);
505 LLVMValueRef rho_s
, rho_t
, rho_r
;
507 rho_s
= LLVMBuildExtractElement(builder
, rho_vec
, index0
, "");
508 rho_t
= LLVMBuildExtractElement(builder
, rho_vec
, index1
, "");
510 rho
= lp_build_max(float_bld
, rho_s
, rho_t
);
513 rho_r
= LLVMBuildExtractElement(builder
, rho_vec
, index2
, "");
514 rho
= lp_build_max(float_bld
, rho
, rho_r
);
519 rho
= lp_build_broadcast_scalar(rho_bld
, rho
);
530 * Bri-linear lod computation
532 * Use a piece-wise linear approximation of log2 such that:
533 * - round to nearest, for values in the neighborhood of -1, 0, 1, 2, etc.
534 * - linear approximation for values in the neighborhood of 0.5, 1.5., etc,
535 * with the steepness specified in 'factor'
536 * - exact result for 0.5, 1.5, etc.
552 * This is a technique also commonly used in hardware:
553 * - http://ixbtlabs.com/articles2/gffx/nv40-rx800-3.html
555 * TODO: For correctness, this should only be applied when texture is known to
556 * have regular mipmaps, i.e., mipmaps derived from the base level.
558 * TODO: This could be done in fixed point, where applicable.
561 lp_build_brilinear_lod(struct lp_build_context
*bld
,
564 LLVMValueRef
*out_lod_ipart
,
565 LLVMValueRef
*out_lod_fpart
)
567 LLVMValueRef lod_fpart
;
568 double pre_offset
= (factor
- 0.5)/factor
- 0.5;
569 double post_offset
= 1 - factor
;
572 lp_build_printf(bld
->gallivm
, "lod = %f\n", lod
);
575 lod
= lp_build_add(bld
, lod
,
576 lp_build_const_vec(bld
->gallivm
, bld
->type
, pre_offset
));
578 lp_build_ifloor_fract(bld
, lod
, out_lod_ipart
, &lod_fpart
);
580 lod_fpart
= lp_build_mul(bld
, lod_fpart
,
581 lp_build_const_vec(bld
->gallivm
, bld
->type
, factor
));
583 lod_fpart
= lp_build_add(bld
, lod_fpart
,
584 lp_build_const_vec(bld
->gallivm
, bld
->type
, post_offset
));
587 * It's not necessary to clamp lod_fpart since:
588 * - the above expression will never produce numbers greater than one.
589 * - the mip filtering branch is only taken if lod_fpart is positive
592 *out_lod_fpart
= lod_fpart
;
595 lp_build_printf(bld
->gallivm
, "lod_ipart = %i\n", *out_lod_ipart
);
596 lp_build_printf(bld
->gallivm
, "lod_fpart = %f\n\n", *out_lod_fpart
);
602 * Combined log2 and brilinear lod computation.
604 * It's in all identical to calling lp_build_fast_log2() and
605 * lp_build_brilinear_lod() above, but by combining we can compute the integer
606 * and fractional part independently.
609 lp_build_brilinear_rho(struct lp_build_context
*bld
,
612 LLVMValueRef
*out_lod_ipart
,
613 LLVMValueRef
*out_lod_fpart
)
615 LLVMValueRef lod_ipart
;
616 LLVMValueRef lod_fpart
;
618 const double pre_factor
= (2*factor
- 0.5)/(M_SQRT2
*factor
);
619 const double post_offset
= 1 - 2*factor
;
621 assert(bld
->type
.floating
);
623 assert(lp_check_value(bld
->type
, rho
));
626 * The pre factor will make the intersections with the exact powers of two
627 * happen precisely where we want them to be, which means that the integer
628 * part will not need any post adjustments.
630 rho
= lp_build_mul(bld
, rho
,
631 lp_build_const_vec(bld
->gallivm
, bld
->type
, pre_factor
));
633 /* ipart = ifloor(log2(rho)) */
634 lod_ipart
= lp_build_extract_exponent(bld
, rho
, 0);
636 /* fpart = rho / 2**ipart */
637 lod_fpart
= lp_build_extract_mantissa(bld
, rho
);
639 lod_fpart
= lp_build_mul(bld
, lod_fpart
,
640 lp_build_const_vec(bld
->gallivm
, bld
->type
, factor
));
642 lod_fpart
= lp_build_add(bld
, lod_fpart
,
643 lp_build_const_vec(bld
->gallivm
, bld
->type
, post_offset
));
646 * Like lp_build_brilinear_lod, it's not necessary to clamp lod_fpart since:
647 * - the above expression will never produce numbers greater than one.
648 * - the mip filtering branch is only taken if lod_fpart is positive
651 *out_lod_ipart
= lod_ipart
;
652 *out_lod_fpart
= lod_fpart
;
657 * Fast implementation of iround(log2(sqrt(x))), based on
658 * log2(x^n) == n*log2(x).
660 * Gives accurate results all the time.
661 * (Could be trivially extended to handle other power-of-two roots.)
664 lp_build_ilog2_sqrt(struct lp_build_context
*bld
,
667 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
669 struct lp_type i_type
= lp_int_type(bld
->type
);
670 LLVMValueRef one
= lp_build_const_int_vec(bld
->gallivm
, i_type
, 1);
672 assert(bld
->type
.floating
);
674 assert(lp_check_value(bld
->type
, x
));
676 /* ipart = log2(x) + 0.5 = 0.5*(log2(x^2) + 1.0) */
677 ipart
= lp_build_extract_exponent(bld
, x
, 1);
678 ipart
= LLVMBuildAShr(builder
, ipart
, one
, "");
685 * Generate code to compute texture level of detail (lambda).
686 * \param derivs partial derivatives of (s, t, r, q) with respect to X and Y
687 * \param lod_bias optional float vector with the shader lod bias
688 * \param explicit_lod optional float vector with the explicit lod
689 * \param cube_rho rho calculated by cube coord mapping (optional)
690 * \param out_lod_ipart integer part of lod
691 * \param out_lod_fpart float part of lod (never larger than 1 but may be negative)
692 * \param out_lod_positive (mask) if lod is positive (i.e. texture is minified)
694 * The resulting lod can be scalar per quad or be per element.
697 lp_build_lod_selector(struct lp_build_sample_context
*bld
,
698 unsigned texture_unit
,
699 unsigned sampler_unit
,
703 LLVMValueRef cube_rho
,
704 const struct lp_derivatives
*derivs
,
705 LLVMValueRef lod_bias
, /* optional */
706 LLVMValueRef explicit_lod
, /* optional */
708 LLVMValueRef
*out_lod_ipart
,
709 LLVMValueRef
*out_lod_fpart
,
710 LLVMValueRef
*out_lod_positive
)
713 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
714 struct lp_build_context
*lodf_bld
= &bld
->lodf_bld
;
717 *out_lod_ipart
= bld
->lodi_bld
.zero
;
718 *out_lod_positive
= bld
->lodi_bld
.zero
;
719 *out_lod_fpart
= lodf_bld
->zero
;
722 * For determining min/mag, we follow GL 4.1 spec, 3.9.12 Texture Magnification:
723 * "Implementations may either unconditionally assume c = 0 for the minification
724 * vs. magnification switch-over point, or may choose to make c depend on the
725 * combination of minification and magnification modes as follows: if the
726 * magnification filter is given by LINEAR and the minification filter is given
727 * by NEAREST_MIPMAP_NEAREST or NEAREST_MIPMAP_LINEAR, then c = 0.5. This is
728 * done to ensure that a minified texture does not appear "sharper" than a
729 * magnified texture. Otherwise c = 0."
730 * And 3.9.11 Texture Minification:
731 * "If lod is less than or equal to the constant c (see section 3.9.12) the
732 * texture is said to be magnified; if it is greater, the texture is minified."
733 * So, using 0 as switchover point always, and using magnification for lod == 0.
734 * Note that the always c = 0 behavior is new (first appearing in GL 3.1 spec),
735 * old GL versions required 0.5 for the modes listed above.
736 * I have no clue about the (undocumented) wishes of d3d9/d3d10 here!
739 if (bld
->static_sampler_state
->min_max_lod_equal
) {
740 /* User is forcing sampling from a particular mipmap level.
741 * This is hit during mipmap generation.
743 LLVMValueRef min_lod
=
744 bld
->dynamic_state
->min_lod(bld
->dynamic_state
,
745 bld
->gallivm
, sampler_unit
);
747 lod
= lp_build_broadcast_scalar(lodf_bld
, min_lod
);
751 if (bld
->num_lods
!= bld
->coord_type
.length
)
752 lod
= lp_build_pack_aos_scalars(bld
->gallivm
, bld
->coord_bld
.type
,
753 lodf_bld
->type
, explicit_lod
, 0);
759 boolean rho_squared
= ((gallivm_debug
& GALLIVM_DEBUG_NO_RHO_APPROX
) &&
760 (bld
->dims
> 1)) || cube_rho
;
762 rho
= lp_build_rho(bld
, texture_unit
, s
, t
, r
, cube_rho
, derivs
);
765 * Compute lod = log2(rho)
769 !bld
->static_sampler_state
->lod_bias_non_zero
&&
770 !bld
->static_sampler_state
->apply_max_lod
&&
771 !bld
->static_sampler_state
->apply_min_lod
) {
773 * Special case when there are no post-log2 adjustments, which
774 * saves instructions but keeping the integer and fractional lod
775 * computations separate from the start.
778 if (mip_filter
== PIPE_TEX_MIPFILTER_NONE
||
779 mip_filter
== PIPE_TEX_MIPFILTER_NEAREST
) {
781 * Don't actually need both values all the time, lod_ipart is
782 * needed for nearest mipfilter, lod_positive if min != mag.
785 *out_lod_ipart
= lp_build_ilog2_sqrt(lodf_bld
, rho
);
788 *out_lod_ipart
= lp_build_ilog2(lodf_bld
, rho
);
790 *out_lod_positive
= lp_build_cmp(lodf_bld
, PIPE_FUNC_GREATER
,
794 if (mip_filter
== PIPE_TEX_MIPFILTER_LINEAR
&&
795 !(gallivm_debug
& GALLIVM_DEBUG_NO_BRILINEAR
) &&
798 * This can't work if rho is squared. Not sure if it could be
799 * fixed while keeping it worthwile, could also do sqrt here
800 * but brilinear and no_rho_opt seems like a combination not
801 * making much sense anyway so just use ordinary path below.
803 lp_build_brilinear_rho(lodf_bld
, rho
, BRILINEAR_FACTOR
,
804 out_lod_ipart
, out_lod_fpart
);
805 *out_lod_positive
= lp_build_cmp(lodf_bld
, PIPE_FUNC_GREATER
,
812 lod
= lp_build_log2(lodf_bld
, rho
);
815 lod
= lp_build_fast_log2(lodf_bld
, rho
);
818 /* log2(x^2) == 0.5*log2(x) */
819 lod
= lp_build_mul(lodf_bld
, lod
,
820 lp_build_const_vec(bld
->gallivm
, lodf_bld
->type
, 0.5F
));
823 /* add shader lod bias */
825 if (bld
->num_lods
!= bld
->coord_type
.length
)
826 lod_bias
= lp_build_pack_aos_scalars(bld
->gallivm
, bld
->coord_bld
.type
,
827 lodf_bld
->type
, lod_bias
, 0);
828 lod
= LLVMBuildFAdd(builder
, lod
, lod_bias
, "shader_lod_bias");
832 /* add sampler lod bias */
833 if (bld
->static_sampler_state
->lod_bias_non_zero
) {
834 LLVMValueRef sampler_lod_bias
=
835 bld
->dynamic_state
->lod_bias(bld
->dynamic_state
,
836 bld
->gallivm
, sampler_unit
);
837 sampler_lod_bias
= lp_build_broadcast_scalar(lodf_bld
,
839 lod
= LLVMBuildFAdd(builder
, lod
, sampler_lod_bias
, "sampler_lod_bias");
843 if (bld
->static_sampler_state
->apply_max_lod
) {
844 LLVMValueRef max_lod
=
845 bld
->dynamic_state
->max_lod(bld
->dynamic_state
,
846 bld
->gallivm
, sampler_unit
);
847 max_lod
= lp_build_broadcast_scalar(lodf_bld
, max_lod
);
849 lod
= lp_build_min(lodf_bld
, lod
, max_lod
);
851 if (bld
->static_sampler_state
->apply_min_lod
) {
852 LLVMValueRef min_lod
=
853 bld
->dynamic_state
->min_lod(bld
->dynamic_state
,
854 bld
->gallivm
, sampler_unit
);
855 min_lod
= lp_build_broadcast_scalar(lodf_bld
, min_lod
);
857 lod
= lp_build_max(lodf_bld
, lod
, min_lod
);
861 *out_lod_positive
= lp_build_cmp(lodf_bld
, PIPE_FUNC_GREATER
,
862 lod
, lodf_bld
->zero
);
864 if (mip_filter
== PIPE_TEX_MIPFILTER_LINEAR
) {
865 if (!(gallivm_debug
& GALLIVM_DEBUG_NO_BRILINEAR
)) {
866 lp_build_brilinear_lod(lodf_bld
, lod
, BRILINEAR_FACTOR
,
867 out_lod_ipart
, out_lod_fpart
);
870 lp_build_ifloor_fract(lodf_bld
, lod
, out_lod_ipart
, out_lod_fpart
);
873 lp_build_name(*out_lod_fpart
, "lod_fpart");
876 *out_lod_ipart
= lp_build_iround(lodf_bld
, lod
);
879 lp_build_name(*out_lod_ipart
, "lod_ipart");
886 * For PIPE_TEX_MIPFILTER_NEAREST, convert int part of lod
887 * to actual mip level.
888 * Note: this is all scalar per quad code.
889 * \param lod_ipart int texture level of detail
890 * \param level_out returns integer
891 * \param out_of_bounds returns per coord out_of_bounds mask if provided
894 lp_build_nearest_mip_level(struct lp_build_sample_context
*bld
,
895 unsigned texture_unit
,
896 LLVMValueRef lod_ipart
,
897 LLVMValueRef
*level_out
,
898 LLVMValueRef
*out_of_bounds
)
900 struct lp_build_context
*leveli_bld
= &bld
->leveli_bld
;
901 LLVMValueRef first_level
, last_level
, level
;
903 first_level
= bld
->dynamic_state
->first_level(bld
->dynamic_state
,
904 bld
->gallivm
, texture_unit
);
905 last_level
= bld
->dynamic_state
->last_level(bld
->dynamic_state
,
906 bld
->gallivm
, texture_unit
);
907 first_level
= lp_build_broadcast_scalar(leveli_bld
, first_level
);
908 last_level
= lp_build_broadcast_scalar(leveli_bld
, last_level
);
910 level
= lp_build_add(leveli_bld
, lod_ipart
, first_level
);
913 LLVMValueRef out
, out1
;
914 out
= lp_build_cmp(leveli_bld
, PIPE_FUNC_LESS
, level
, first_level
);
915 out1
= lp_build_cmp(leveli_bld
, PIPE_FUNC_GREATER
, level
, last_level
);
916 out
= lp_build_or(leveli_bld
, out
, out1
);
917 if (bld
->num_mips
== bld
->coord_bld
.type
.length
) {
918 *out_of_bounds
= out
;
920 else if (bld
->num_mips
== 1) {
921 *out_of_bounds
= lp_build_broadcast_scalar(&bld
->int_coord_bld
, out
);
924 assert(bld
->num_mips
== bld
->coord_bld
.type
.length
/ 4);
925 *out_of_bounds
= lp_build_unpack_broadcast_aos_scalars(bld
->gallivm
,
927 bld
->int_coord_bld
.type
,
930 level
= lp_build_andnot(&bld
->int_coord_bld
, level
, *out_of_bounds
);
934 /* clamp level to legal range of levels */
935 *level_out
= lp_build_clamp(leveli_bld
, level
, first_level
, last_level
);
942 * For PIPE_TEX_MIPFILTER_LINEAR, convert per-quad (or per element) int LOD(s)
943 * to two (per-quad) (adjacent) mipmap level indexes, and fix up float lod
945 * Later, we'll sample from those two mipmap levels and interpolate between them.
948 lp_build_linear_mip_levels(struct lp_build_sample_context
*bld
,
949 unsigned texture_unit
,
950 LLVMValueRef lod_ipart
,
951 LLVMValueRef
*lod_fpart_inout
,
952 LLVMValueRef
*level0_out
,
953 LLVMValueRef
*level1_out
)
955 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
956 struct lp_build_context
*leveli_bld
= &bld
->leveli_bld
;
957 struct lp_build_context
*levelf_bld
= &bld
->levelf_bld
;
958 LLVMValueRef first_level
, last_level
;
959 LLVMValueRef clamp_min
;
960 LLVMValueRef clamp_max
;
962 assert(bld
->num_lods
== bld
->num_mips
);
964 first_level
= bld
->dynamic_state
->first_level(bld
->dynamic_state
,
965 bld
->gallivm
, texture_unit
);
966 last_level
= bld
->dynamic_state
->last_level(bld
->dynamic_state
,
967 bld
->gallivm
, texture_unit
);
968 first_level
= lp_build_broadcast_scalar(leveli_bld
, first_level
);
969 last_level
= lp_build_broadcast_scalar(leveli_bld
, last_level
);
971 *level0_out
= lp_build_add(leveli_bld
, lod_ipart
, first_level
);
972 *level1_out
= lp_build_add(leveli_bld
, *level0_out
, leveli_bld
->one
);
975 * Clamp both *level0_out and *level1_out to [first_level, last_level], with
976 * the minimum number of comparisons, and zeroing lod_fpart in the extreme
977 * ends in the process.
980 /* *level0_out < first_level */
981 clamp_min
= LLVMBuildICmp(builder
, LLVMIntSLT
,
982 *level0_out
, first_level
,
983 "clamp_lod_to_first");
985 *level0_out
= LLVMBuildSelect(builder
, clamp_min
,
986 first_level
, *level0_out
, "");
988 *level1_out
= LLVMBuildSelect(builder
, clamp_min
,
989 first_level
, *level1_out
, "");
991 *lod_fpart_inout
= LLVMBuildSelect(builder
, clamp_min
,
992 levelf_bld
->zero
, *lod_fpart_inout
, "");
994 /* *level0_out >= last_level */
995 clamp_max
= LLVMBuildICmp(builder
, LLVMIntSGE
,
996 *level0_out
, last_level
,
997 "clamp_lod_to_last");
999 *level0_out
= LLVMBuildSelect(builder
, clamp_max
,
1000 last_level
, *level0_out
, "");
1002 *level1_out
= LLVMBuildSelect(builder
, clamp_max
,
1003 last_level
, *level1_out
, "");
1005 *lod_fpart_inout
= LLVMBuildSelect(builder
, clamp_max
,
1006 levelf_bld
->zero
, *lod_fpart_inout
, "");
1008 lp_build_name(*level0_out
, "texture%u_miplevel0", texture_unit
);
1009 lp_build_name(*level1_out
, "texture%u_miplevel1", texture_unit
);
1010 lp_build_name(*lod_fpart_inout
, "texture%u_mipweight", texture_unit
);
1015 * Return pointer to a single mipmap level.
1016 * \param level integer mipmap level
1019 lp_build_get_mipmap_level(struct lp_build_sample_context
*bld
,
1022 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
1023 LLVMValueRef indexes
[2], data_ptr
, mip_offset
;
1025 indexes
[0] = lp_build_const_int32(bld
->gallivm
, 0);
1027 mip_offset
= LLVMBuildGEP(builder
, bld
->mip_offsets
, indexes
, 2, "");
1028 mip_offset
= LLVMBuildLoad(builder
, mip_offset
, "");
1029 data_ptr
= LLVMBuildGEP(builder
, bld
->base_ptr
, &mip_offset
, 1, "");
1034 * Return (per-pixel) offsets to mip levels.
1035 * \param level integer mipmap level
1038 lp_build_get_mip_offsets(struct lp_build_sample_context
*bld
,
1041 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
1042 LLVMValueRef indexes
[2], offsets
, offset1
;
1044 indexes
[0] = lp_build_const_int32(bld
->gallivm
, 0);
1045 if (bld
->num_mips
== 1) {
1047 offset1
= LLVMBuildGEP(builder
, bld
->mip_offsets
, indexes
, 2, "");
1048 offset1
= LLVMBuildLoad(builder
, offset1
, "");
1049 offsets
= lp_build_broadcast_scalar(&bld
->int_coord_bld
, offset1
);
1051 else if (bld
->num_mips
== bld
->coord_bld
.type
.length
/ 4) {
1054 offsets
= bld
->int_coord_bld
.undef
;
1055 for (i
= 0; i
< bld
->num_mips
; i
++) {
1056 LLVMValueRef indexi
= lp_build_const_int32(bld
->gallivm
, i
);
1057 LLVMValueRef indexo
= lp_build_const_int32(bld
->gallivm
, 4 * i
);
1058 indexes
[1] = LLVMBuildExtractElement(builder
, level
, indexi
, "");
1059 offset1
= LLVMBuildGEP(builder
, bld
->mip_offsets
, indexes
, 2, "");
1060 offset1
= LLVMBuildLoad(builder
, offset1
, "");
1061 offsets
= LLVMBuildInsertElement(builder
, offsets
, offset1
, indexo
, "");
1063 offsets
= lp_build_swizzle_scalar_aos(&bld
->int_coord_bld
, offsets
, 0, 4);
1068 assert (bld
->num_mips
== bld
->coord_bld
.type
.length
);
1070 offsets
= bld
->int_coord_bld
.undef
;
1071 for (i
= 0; i
< bld
->num_mips
; i
++) {
1072 LLVMValueRef indexi
= lp_build_const_int32(bld
->gallivm
, i
);
1073 indexes
[1] = LLVMBuildExtractElement(builder
, level
, indexi
, "");
1074 offset1
= LLVMBuildGEP(builder
, bld
->mip_offsets
, indexes
, 2, "");
1075 offset1
= LLVMBuildLoad(builder
, offset1
, "");
1076 offsets
= LLVMBuildInsertElement(builder
, offsets
, offset1
, indexi
, "");
1084 * Codegen equivalent for u_minify().
1085 * @param lod_scalar if lod is a (broadcasted) scalar
1086 * Return max(1, base_size >> level);
1089 lp_build_minify(struct lp_build_context
*bld
,
1090 LLVMValueRef base_size
,
1094 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
1095 assert(lp_check_value(bld
->type
, base_size
));
1096 assert(lp_check_value(bld
->type
, level
));
1098 if (level
== bld
->zero
) {
1099 /* if we're using mipmap level zero, no minification is needed */
1104 assert(bld
->type
.sign
);
1106 (util_cpu_caps
.has_avx2
|| !util_cpu_caps
.has_sse
)) {
1107 size
= LLVMBuildLShr(builder
, base_size
, level
, "minify");
1108 size
= lp_build_max(bld
, size
, bld
->one
);
1112 * emulate shift with float mul, since intel "forgot" shifts with
1113 * per-element shift count until avx2, which results in terrible
1114 * scalar extraction (both count and value), scalar shift,
1115 * vector reinsertion. Should not be an issue on any non-x86 cpu
1116 * with a vector instruction set.
1117 * On cpus with AMD's XOP this should also be unnecessary but I'm
1118 * not sure if llvm would emit this with current flags.
1120 LLVMValueRef const127
, const23
, lf
;
1121 struct lp_type ftype
;
1122 struct lp_build_context fbld
;
1123 ftype
= lp_type_float_vec(32, bld
->type
.length
* bld
->type
.width
);
1124 lp_build_context_init(&fbld
, bld
->gallivm
, ftype
);
1125 const127
= lp_build_const_int_vec(bld
->gallivm
, bld
->type
, 127);
1126 const23
= lp_build_const_int_vec(bld
->gallivm
, bld
->type
, 23);
1128 /* calculate 2^(-level) float */
1129 lf
= lp_build_sub(bld
, const127
, level
);
1130 lf
= lp_build_shl(bld
, lf
, const23
);
1131 lf
= LLVMBuildBitCast(builder
, lf
, fbld
.vec_type
, "");
1133 /* finish shift operation by doing float mul */
1134 base_size
= lp_build_int_to_float(&fbld
, base_size
);
1135 size
= lp_build_mul(&fbld
, base_size
, lf
);
1137 * do the max also with floats because
1138 * a) non-emulated int max requires sse41
1139 * (this is actually a lie as we could cast to 16bit values
1140 * as 16bit is sufficient and 16bit int max is sse2)
1141 * b) with avx we can do int max 4-wide but float max 8-wide
1143 size
= lp_build_max(&fbld
, size
, fbld
.one
);
1144 size
= lp_build_itrunc(&fbld
, size
);
1152 * Dereference stride_array[mipmap_level] array to get a stride.
1153 * Return stride as a vector.
1156 lp_build_get_level_stride_vec(struct lp_build_sample_context
*bld
,
1157 LLVMValueRef stride_array
, LLVMValueRef level
)
1159 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
1160 LLVMValueRef indexes
[2], stride
, stride1
;
1161 indexes
[0] = lp_build_const_int32(bld
->gallivm
, 0);
1162 if (bld
->num_mips
== 1) {
1164 stride1
= LLVMBuildGEP(builder
, stride_array
, indexes
, 2, "");
1165 stride1
= LLVMBuildLoad(builder
, stride1
, "");
1166 stride
= lp_build_broadcast_scalar(&bld
->int_coord_bld
, stride1
);
1168 else if (bld
->num_mips
== bld
->coord_bld
.type
.length
/ 4) {
1169 LLVMValueRef stride1
;
1172 stride
= bld
->int_coord_bld
.undef
;
1173 for (i
= 0; i
< bld
->num_mips
; i
++) {
1174 LLVMValueRef indexi
= lp_build_const_int32(bld
->gallivm
, i
);
1175 LLVMValueRef indexo
= lp_build_const_int32(bld
->gallivm
, 4 * i
);
1176 indexes
[1] = LLVMBuildExtractElement(builder
, level
, indexi
, "");
1177 stride1
= LLVMBuildGEP(builder
, stride_array
, indexes
, 2, "");
1178 stride1
= LLVMBuildLoad(builder
, stride1
, "");
1179 stride
= LLVMBuildInsertElement(builder
, stride
, stride1
, indexo
, "");
1181 stride
= lp_build_swizzle_scalar_aos(&bld
->int_coord_bld
, stride
, 0, 4);
1184 LLVMValueRef stride1
;
1187 assert (bld
->num_mips
== bld
->coord_bld
.type
.length
);
1189 stride
= bld
->int_coord_bld
.undef
;
1190 for (i
= 0; i
< bld
->coord_bld
.type
.length
; i
++) {
1191 LLVMValueRef indexi
= lp_build_const_int32(bld
->gallivm
, i
);
1192 indexes
[1] = LLVMBuildExtractElement(builder
, level
, indexi
, "");
1193 stride1
= LLVMBuildGEP(builder
, stride_array
, indexes
, 2, "");
1194 stride1
= LLVMBuildLoad(builder
, stride1
, "");
1195 stride
= LLVMBuildInsertElement(builder
, stride
, stride1
, indexi
, "");
1203 * When sampling a mipmap, we need to compute the width, height, depth
1204 * of the source levels from the level indexes. This helper function
1208 lp_build_mipmap_level_sizes(struct lp_build_sample_context
*bld
,
1209 LLVMValueRef ilevel
,
1210 LLVMValueRef
*out_size
,
1211 LLVMValueRef
*row_stride_vec
,
1212 LLVMValueRef
*img_stride_vec
)
1214 const unsigned dims
= bld
->dims
;
1215 LLVMValueRef ilevel_vec
;
1218 * Compute width, height, depth at mipmap level 'ilevel'
1220 if (bld
->num_mips
== 1) {
1221 ilevel_vec
= lp_build_broadcast_scalar(&bld
->int_size_bld
, ilevel
);
1222 *out_size
= lp_build_minify(&bld
->int_size_bld
, bld
->int_size
, ilevel_vec
, TRUE
);
1225 LLVMValueRef int_size_vec
;
1226 LLVMValueRef tmp
[LP_MAX_VECTOR_LENGTH
];
1227 unsigned num_quads
= bld
->coord_bld
.type
.length
/ 4;
1230 if (bld
->num_mips
== num_quads
) {
1232 * XXX: this should be #ifndef SANE_INSTRUCTION_SET.
1233 * intel "forgot" the variable shift count instruction until avx2.
1234 * A harmless 8x32 shift gets translated into 32 instructions
1235 * (16 extracts, 8 scalar shifts, 8 inserts), llvm is apparently
1236 * unable to recognize if there are really just 2 different shift
1237 * count values. So do the shift 4-wide before expansion.
1239 struct lp_build_context bld4
;
1240 struct lp_type type4
;
1242 type4
= bld
->int_coord_bld
.type
;
1245 lp_build_context_init(&bld4
, bld
->gallivm
, type4
);
1247 if (bld
->dims
== 1) {
1248 assert(bld
->int_size_in_bld
.type
.length
== 1);
1249 int_size_vec
= lp_build_broadcast_scalar(&bld4
,
1253 assert(bld
->int_size_in_bld
.type
.length
== 4);
1254 int_size_vec
= bld
->int_size
;
1257 for (i
= 0; i
< num_quads
; i
++) {
1258 LLVMValueRef ileveli
;
1259 LLVMValueRef indexi
= lp_build_const_int32(bld
->gallivm
, i
);
1261 ileveli
= lp_build_extract_broadcast(bld
->gallivm
,
1262 bld
->leveli_bld
.type
,
1266 tmp
[i
] = lp_build_minify(&bld4
, int_size_vec
, ileveli
, TRUE
);
1269 * out_size is [w0, h0, d0, _, w1, h1, d1, _, ...] vector for dims > 1,
1270 * [w0, w0, w0, w0, w1, w1, w1, w1, ...] otherwise.
1272 *out_size
= lp_build_concat(bld
->gallivm
,
1278 /* FIXME: this is terrible and results in _huge_ vector
1279 * (for the dims > 1 case).
1280 * Should refactor this (together with extract_image_sizes) and do
1281 * something more useful. Could for instance if we have width,height
1282 * with 4-wide vector pack all elements into a 8xi16 vector
1283 * (on which we can still do useful math) instead of using a 16xi32
1285 * For dims == 1 this will create [w0, w1, w2, w3, ...] vector.
1286 * For dims > 1 this will create [w0, h0, d0, _, w1, h1, d1, _, ...] vector.
1288 assert(bld
->num_mips
== bld
->coord_bld
.type
.length
);
1289 if (bld
->dims
== 1) {
1290 assert(bld
->int_size_in_bld
.type
.length
== 1);
1291 int_size_vec
= lp_build_broadcast_scalar(&bld
->int_coord_bld
,
1293 *out_size
= lp_build_minify(&bld
->int_coord_bld
, int_size_vec
, ilevel
, FALSE
);
1296 LLVMValueRef ilevel1
;
1297 for (i
= 0; i
< bld
->num_mips
; i
++) {
1298 LLVMValueRef indexi
= lp_build_const_int32(bld
->gallivm
, i
);
1299 ilevel1
= lp_build_extract_broadcast(bld
->gallivm
, bld
->int_coord_type
,
1300 bld
->int_size_in_bld
.type
, ilevel
, indexi
);
1301 tmp
[i
] = bld
->int_size
;
1302 tmp
[i
] = lp_build_minify(&bld
->int_size_in_bld
, tmp
[i
], ilevel1
, TRUE
);
1304 *out_size
= lp_build_concat(bld
->gallivm
, tmp
,
1305 bld
->int_size_in_bld
.type
,
1312 *row_stride_vec
= lp_build_get_level_stride_vec(bld
,
1313 bld
->row_stride_array
,
1316 if (dims
== 3 || has_layer_coord(bld
->static_texture_state
->target
)) {
1317 *img_stride_vec
= lp_build_get_level_stride_vec(bld
,
1318 bld
->img_stride_array
,
1325 * Extract and broadcast texture size.
1327 * @param size_type type of the texture size vector (either
1328 * bld->int_size_type or bld->float_size_type)
1329 * @param coord_type type of the texture size vector (either
1330 * bld->int_coord_type or bld->coord_type)
1331 * @param size vector with the texture size (width, height, depth)
1334 lp_build_extract_image_sizes(struct lp_build_sample_context
*bld
,
1335 struct lp_build_context
*size_bld
,
1336 struct lp_type coord_type
,
1338 LLVMValueRef
*out_width
,
1339 LLVMValueRef
*out_height
,
1340 LLVMValueRef
*out_depth
)
1342 const unsigned dims
= bld
->dims
;
1343 LLVMTypeRef i32t
= LLVMInt32TypeInContext(bld
->gallivm
->context
);
1344 struct lp_type size_type
= size_bld
->type
;
1346 if (bld
->num_mips
== 1) {
1347 *out_width
= lp_build_extract_broadcast(bld
->gallivm
,
1351 LLVMConstInt(i32t
, 0, 0));
1353 *out_height
= lp_build_extract_broadcast(bld
->gallivm
,
1357 LLVMConstInt(i32t
, 1, 0));
1359 *out_depth
= lp_build_extract_broadcast(bld
->gallivm
,
1363 LLVMConstInt(i32t
, 2, 0));
1368 unsigned num_quads
= bld
->coord_bld
.type
.length
/ 4;
1373 else if (bld
->num_mips
== num_quads
) {
1374 *out_width
= lp_build_swizzle_scalar_aos(size_bld
, size
, 0, 4);
1376 *out_height
= lp_build_swizzle_scalar_aos(size_bld
, size
, 1, 4);
1378 *out_depth
= lp_build_swizzle_scalar_aos(size_bld
, size
, 2, 4);
1383 assert(bld
->num_mips
== bld
->coord_type
.length
);
1384 *out_width
= lp_build_pack_aos_scalars(bld
->gallivm
, size_type
,
1385 coord_type
, size
, 0);
1387 *out_height
= lp_build_pack_aos_scalars(bld
->gallivm
, size_type
,
1388 coord_type
, size
, 1);
1390 *out_depth
= lp_build_pack_aos_scalars(bld
->gallivm
, size_type
,
1391 coord_type
, size
, 2);
1400 * Unnormalize coords.
1402 * @param flt_size vector with the integer texture size (width, height, depth)
1405 lp_build_unnormalized_coords(struct lp_build_sample_context
*bld
,
1406 LLVMValueRef flt_size
,
1411 const unsigned dims
= bld
->dims
;
1413 LLVMValueRef height
;
1416 lp_build_extract_image_sizes(bld
,
1417 &bld
->float_size_bld
,
1424 /* s = s * width, t = t * height */
1425 *s
= lp_build_mul(&bld
->coord_bld
, *s
, width
);
1427 *t
= lp_build_mul(&bld
->coord_bld
, *t
, height
);
1429 *r
= lp_build_mul(&bld
->coord_bld
, *r
, depth
);
1435 * Generate new coords and faces for cubemap texels falling off the face.
1437 * @param face face (center) of the pixel
1438 * @param x0 lower x coord
1439 * @param x1 higher x coord (must be x0 + 1)
1440 * @param y0 lower y coord
1441 * @param y1 higher y coord (must be x0 + 1)
1442 * @param max_coord texture cube (level) size - 1
1443 * @param next_faces new face values when falling off
1444 * @param next_xcoords new x coord values when falling off
1445 * @param next_ycoords new y coord values when falling off
1447 * The arrays hold the new values when under/overflow of
1448 * lower x, higher x, lower y, higher y coord would occur (in this order).
1449 * next_xcoords/next_ycoords have two entries each (for both new lower and
1453 lp_build_cube_new_coords(struct lp_build_context
*ivec_bld
,
1459 LLVMValueRef max_coord
,
1460 LLVMValueRef next_faces
[4],
1461 LLVMValueRef next_xcoords
[4][2],
1462 LLVMValueRef next_ycoords
[4][2])
1465 * Lookup tables aren't nice for simd code hence try some logic here.
1466 * (Note that while it would not be necessary to do per-sample (4) lookups
1467 * when using a LUT as it's impossible that texels fall off of positive
1468 * and negative edges simultaneously, it would however be necessary to
1469 * do 2 lookups for corner handling as in this case texels both fall off
1473 * Next faces (for face 012345):
1478 * Hence nfx+ (and nfy+) == nfx- (nfy-) xor 1
1479 * nfx-: face > 1 ? (face == 5 ? 0 : 1) : (4 + face & 1)
1480 * nfy+: face & ~4 > 1 ? face + 2 : 3;
1481 * This could also use pshufb instead, but would need (manually coded)
1482 * ssse3 intrinsic (llvm won't do non-constant shuffles).
1484 struct gallivm_state
*gallivm
= ivec_bld
->gallivm
;
1485 LLVMValueRef sel
, sel_f2345
, sel_f23
, sel_f2
, tmpsel
, tmp
;
1486 LLVMValueRef faceand1
, sel_fand1
, maxmx0
, maxmx1
, maxmy0
, maxmy1
;
1487 LLVMValueRef c2
= lp_build_const_int_vec(gallivm
, ivec_bld
->type
, 2);
1488 LLVMValueRef c3
= lp_build_const_int_vec(gallivm
, ivec_bld
->type
, 3);
1489 LLVMValueRef c4
= lp_build_const_int_vec(gallivm
, ivec_bld
->type
, 4);
1490 LLVMValueRef c5
= lp_build_const_int_vec(gallivm
, ivec_bld
->type
, 5);
1492 sel
= lp_build_cmp(ivec_bld
, PIPE_FUNC_EQUAL
, face
, c5
);
1493 tmpsel
= lp_build_select(ivec_bld
, sel
, ivec_bld
->zero
, ivec_bld
->one
);
1494 sel_f2345
= lp_build_cmp(ivec_bld
, PIPE_FUNC_GREATER
, face
, ivec_bld
->one
);
1495 faceand1
= lp_build_and(ivec_bld
, face
, ivec_bld
->one
);
1496 tmp
= lp_build_add(ivec_bld
, faceand1
, c4
);
1497 next_faces
[0] = lp_build_select(ivec_bld
, sel_f2345
, tmpsel
, tmp
);
1498 next_faces
[1] = lp_build_xor(ivec_bld
, next_faces
[0], ivec_bld
->one
);
1500 tmp
= lp_build_andnot(ivec_bld
, face
, c4
);
1501 sel_f23
= lp_build_cmp(ivec_bld
, PIPE_FUNC_GREATER
, tmp
, ivec_bld
->one
);
1502 tmp
= lp_build_add(ivec_bld
, face
, c2
);
1503 next_faces
[3] = lp_build_select(ivec_bld
, sel_f23
, tmp
, c3
);
1504 next_faces
[2] = lp_build_xor(ivec_bld
, next_faces
[3], ivec_bld
->one
);
1507 * new xcoords (for face 012345):
1508 * x < 0.0 : max max t max-t max max
1509 * x >= 1.0 : 0 0 max-t t 0 0
1510 * y < 0.0 : max 0 max-s s s max-s
1511 * y >= 1.0 : max 0 s max-s s max-s
1513 * ncx[1] = face & ~4 > 1 ? (face == 2 ? max-t : t) : 0
1514 * ncx[0] = max - ncx[1]
1515 * ncx[3] = face > 1 ? (face & 1 ? max-s : s) : (face & 1) ? 0 : max
1516 * ncx[2] = face & ~4 > 1 ? max - ncx[3] : ncx[3]
1518 sel_f2
= lp_build_cmp(ivec_bld
, PIPE_FUNC_EQUAL
, face
, c2
);
1519 maxmy0
= lp_build_sub(ivec_bld
, max_coord
, y0
);
1520 tmp
= lp_build_select(ivec_bld
, sel_f2
, maxmy0
, y0
);
1521 next_xcoords
[1][0] = lp_build_select(ivec_bld
, sel_f23
, tmp
, ivec_bld
->zero
);
1522 next_xcoords
[0][0] = lp_build_sub(ivec_bld
, max_coord
, next_xcoords
[1][0]);
1523 maxmy1
= lp_build_sub(ivec_bld
, max_coord
, y1
);
1524 tmp
= lp_build_select(ivec_bld
, sel_f2
, maxmy1
, y1
);
1525 next_xcoords
[1][1] = lp_build_select(ivec_bld
, sel_f23
, tmp
, ivec_bld
->zero
);
1526 next_xcoords
[0][1] = lp_build_sub(ivec_bld
, max_coord
, next_xcoords
[1][1]);
1528 sel_fand1
= lp_build_cmp(ivec_bld
, PIPE_FUNC_EQUAL
, faceand1
, ivec_bld
->one
);
1530 tmpsel
= lp_build_select(ivec_bld
, sel_fand1
, ivec_bld
->zero
, max_coord
);
1531 maxmx0
= lp_build_sub(ivec_bld
, max_coord
, x0
);
1532 tmp
= lp_build_select(ivec_bld
, sel_fand1
, maxmx0
, x0
);
1533 next_xcoords
[3][0] = lp_build_select(ivec_bld
, sel_f2345
, tmp
, tmpsel
);
1534 tmp
= lp_build_sub(ivec_bld
, max_coord
, next_xcoords
[3][0]);
1535 next_xcoords
[2][0] = lp_build_select(ivec_bld
, sel_f23
, tmp
, next_xcoords
[3][0]);
1536 maxmx1
= lp_build_sub(ivec_bld
, max_coord
, x1
);
1537 tmp
= lp_build_select(ivec_bld
, sel_fand1
, maxmx1
, x1
);
1538 next_xcoords
[3][1] = lp_build_select(ivec_bld
, sel_f2345
, tmp
, tmpsel
);
1539 tmp
= lp_build_sub(ivec_bld
, max_coord
, next_xcoords
[3][1]);
1540 next_xcoords
[2][1] = lp_build_select(ivec_bld
, sel_f23
, tmp
, next_xcoords
[3][1]);
1543 * new ycoords (for face 012345):
1544 * x < 0.0 : t t 0 max t t
1545 * x >= 1.0 : t t 0 max t t
1546 * y < 0.0 : max-s s 0 max max 0
1547 * y >= 1.0 : s max-s 0 max 0 max
1549 * ncy[0] = face & ~4 > 1 ? (face == 2 ? 0 : max) : t
1551 * ncy[3] = face > 1 ? (face & 1 ? max : 0) : (face & 1) ? max-s : max
1552 * ncx[2] = face & ~4 > 1 ? max - ncx[3] : ncx[3]
1554 tmp
= lp_build_select(ivec_bld
, sel_f2
, ivec_bld
->zero
, max_coord
);
1555 next_ycoords
[0][0] = lp_build_select(ivec_bld
, sel_f23
, tmp
, y0
);
1556 next_ycoords
[1][0] = next_ycoords
[0][0];
1557 next_ycoords
[0][1] = lp_build_select(ivec_bld
, sel_f23
, tmp
, y1
);
1558 next_ycoords
[1][1] = next_ycoords
[0][1];
1560 tmpsel
= lp_build_select(ivec_bld
, sel_fand1
, maxmx0
, x0
);
1561 tmp
= lp_build_select(ivec_bld
, sel_fand1
, max_coord
, ivec_bld
->zero
);
1562 next_ycoords
[3][0] = lp_build_select(ivec_bld
, sel_f2345
, tmp
, tmpsel
);
1563 tmp
= lp_build_sub(ivec_bld
, max_coord
, next_ycoords
[3][0]);
1564 next_ycoords
[2][0] = lp_build_select(ivec_bld
, sel_f23
, next_ycoords
[3][0], tmp
);
1565 tmpsel
= lp_build_select(ivec_bld
, sel_fand1
, maxmx1
, x1
);
1566 tmp
= lp_build_select(ivec_bld
, sel_fand1
, max_coord
, ivec_bld
->zero
);
1567 next_ycoords
[3][1] = lp_build_select(ivec_bld
, sel_f2345
, tmp
, tmpsel
);
1568 tmp
= lp_build_sub(ivec_bld
, max_coord
, next_ycoords
[3][1]);
1569 next_ycoords
[2][1] = lp_build_select(ivec_bld
, sel_f23
, next_ycoords
[3][1], tmp
);
1573 /** Helper used by lp_build_cube_lookup() */
1575 lp_build_cube_imapos(struct lp_build_context
*coord_bld
, LLVMValueRef coord
)
1577 /* ima = +0.5 / abs(coord); */
1578 LLVMValueRef posHalf
= lp_build_const_vec(coord_bld
->gallivm
, coord_bld
->type
, 0.5);
1579 LLVMValueRef absCoord
= lp_build_abs(coord_bld
, coord
);
1580 LLVMValueRef ima
= lp_build_div(coord_bld
, posHalf
, absCoord
);
1585 /** Helper for doing 3-wise selection.
1586 * Returns sel1 ? val2 : (sel0 ? val0 : val1).
1589 lp_build_select3(struct lp_build_context
*sel_bld
,
1597 tmp
= lp_build_select(sel_bld
, sel0
, val0
, val1
);
1598 return lp_build_select(sel_bld
, sel1
, val2
, tmp
);
1603 * Generate code to do cube face selection and compute per-face texcoords.
1606 lp_build_cube_lookup(struct lp_build_sample_context
*bld
,
1607 LLVMValueRef
*coords
,
1608 const struct lp_derivatives
*derivs_in
, /* optional */
1610 struct lp_derivatives
*derivs_out
, /* optional */
1611 boolean need_derivs
)
1613 struct lp_build_context
*coord_bld
= &bld
->coord_bld
;
1614 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
1615 struct gallivm_state
*gallivm
= bld
->gallivm
;
1616 LLVMValueRef si
, ti
, ri
;
1619 * Do per-pixel face selection. We cannot however (as we used to do)
1620 * simply calculate the derivs afterwards (which is very bogus for
1621 * explicit derivs btw) because the values would be "random" when
1622 * not all pixels lie on the same face. So what we do here is just
1623 * calculate the derivatives after scaling the coords by the absolute
1624 * value of the inverse major axis, and essentially do rho calculation
1625 * steps as if it were a 3d texture. This is perfect if all pixels hit
1626 * the same face, but not so great at edges, I believe the max error
1627 * should be sqrt(2) with no_rho_approx or 2 otherwise (essentially measuring
1628 * the 3d distance between 2 points on the cube instead of measuring up/down
1629 * the edge). Still this is possibly a win over just selecting the same face
1630 * for all pixels. Unfortunately, something like that doesn't work for
1631 * explicit derivatives.
1633 struct lp_build_context
*cint_bld
= &bld
->int_coord_bld
;
1634 struct lp_type intctype
= cint_bld
->type
;
1635 LLVMTypeRef coord_vec_type
= coord_bld
->vec_type
;
1636 LLVMTypeRef cint_vec_type
= cint_bld
->vec_type
;
1637 LLVMValueRef as
, at
, ar
, face
, face_s
, face_t
;
1638 LLVMValueRef as_ge_at
, maxasat
, ar_ge_as_at
;
1639 LLVMValueRef snewx
, tnewx
, snewy
, tnewy
, snewz
, tnewz
;
1640 LLVMValueRef tnegi
, rnegi
;
1641 LLVMValueRef ma
, mai
, signma
, signmabit
, imahalfpos
;
1642 LLVMValueRef posHalf
= lp_build_const_vec(gallivm
, coord_bld
->type
, 0.5);
1643 LLVMValueRef signmask
= lp_build_const_int_vec(gallivm
, intctype
,
1644 1LL << (intctype
.width
- 1));
1645 LLVMValueRef signshift
= lp_build_const_int_vec(gallivm
, intctype
,
1647 LLVMValueRef facex
= lp_build_const_int_vec(gallivm
, intctype
, PIPE_TEX_FACE_POS_X
);
1648 LLVMValueRef facey
= lp_build_const_int_vec(gallivm
, intctype
, PIPE_TEX_FACE_POS_Y
);
1649 LLVMValueRef facez
= lp_build_const_int_vec(gallivm
, intctype
, PIPE_TEX_FACE_POS_Z
);
1650 LLVMValueRef s
= coords
[0];
1651 LLVMValueRef t
= coords
[1];
1652 LLVMValueRef r
= coords
[2];
1654 assert(PIPE_TEX_FACE_NEG_X
== PIPE_TEX_FACE_POS_X
+ 1);
1655 assert(PIPE_TEX_FACE_NEG_Y
== PIPE_TEX_FACE_POS_Y
+ 1);
1656 assert(PIPE_TEX_FACE_NEG_Z
== PIPE_TEX_FACE_POS_Z
+ 1);
1659 * get absolute value (for x/y/z face selection) and sign bit
1660 * (for mirroring minor coords and pos/neg face selection)
1661 * of the original coords.
1663 as
= lp_build_abs(&bld
->coord_bld
, s
);
1664 at
= lp_build_abs(&bld
->coord_bld
, t
);
1665 ar
= lp_build_abs(&bld
->coord_bld
, r
);
1668 * major face determination: select x if x > y else select y
1669 * select z if z >= max(x,y) else select previous result
1670 * if some axis are the same we chose z over y, y over x - the
1671 * dx10 spec seems to ask for it while OpenGL doesn't care (if we
1672 * wouldn't care could save a select or two if using different
1673 * compares and doing at_g_as_ar last since tnewx and tnewz are the
1676 as_ge_at
= lp_build_cmp(coord_bld
, PIPE_FUNC_GREATER
, as
, at
);
1677 maxasat
= lp_build_max(coord_bld
, as
, at
);
1678 ar_ge_as_at
= lp_build_cmp(coord_bld
, PIPE_FUNC_GEQUAL
, ar
, maxasat
);
1680 if (need_derivs
&& (derivs_in
||
1681 ((gallivm_debug
& GALLIVM_DEBUG_NO_QUAD_LOD
) &&
1682 (gallivm_debug
& GALLIVM_DEBUG_NO_RHO_APPROX
)))) {
1684 * XXX: This is really really complex.
1685 * It is a bit overkill to use this for implicit derivatives as well,
1686 * no way this is worth the cost in practice, but seems to be the
1687 * only way for getting accurate and per-pixel lod values.
1689 LLVMValueRef ima
, imahalf
, tmp
, ddx
[3], ddy
[3];
1690 LLVMValueRef madx
, mady
, madxdivma
, madydivma
;
1691 LLVMValueRef sdxi
, tdxi
, rdxi
, sdyi
, tdyi
, rdyi
;
1692 LLVMValueRef tdxnegi
, rdxnegi
, tdynegi
, rdynegi
;
1693 LLVMValueRef sdxnewx
, sdxnewy
, sdxnewz
, tdxnewx
, tdxnewy
, tdxnewz
;
1694 LLVMValueRef sdynewx
, sdynewy
, sdynewz
, tdynewx
, tdynewy
, tdynewz
;
1695 LLVMValueRef face_sdx
, face_tdx
, face_sdy
, face_tdy
;
1697 * s = 1/2 * ( sc / ma + 1)
1698 * t = 1/2 * ( tc / ma + 1)
1700 * s' = 1/2 * (sc' * ma - sc * ma') / ma^2
1701 * t' = 1/2 * (tc' * ma - tc * ma') / ma^2
1703 * dx.s = 0.5 * (dx.sc - sc * dx.ma / ma) / ma
1704 * dx.t = 0.5 * (dx.tc - tc * dx.ma / ma) / ma
1705 * dy.s = 0.5 * (dy.sc - sc * dy.ma / ma) / ma
1706 * dy.t = 0.5 * (dy.tc - tc * dy.ma / ma) / ma
1709 /* select ma, calculate ima */
1710 ma
= lp_build_select3(coord_bld
, as_ge_at
, ar_ge_as_at
, s
, t
, r
);
1711 mai
= LLVMBuildBitCast(builder
, ma
, cint_vec_type
, "");
1712 signmabit
= LLVMBuildAnd(builder
, mai
, signmask
, "");
1713 ima
= lp_build_div(coord_bld
, coord_bld
->one
, ma
);
1714 imahalf
= lp_build_mul(coord_bld
, posHalf
, ima
);
1715 imahalfpos
= lp_build_abs(coord_bld
, imahalf
);
1718 ddx
[0] = lp_build_ddx(coord_bld
, s
);
1719 ddx
[1] = lp_build_ddx(coord_bld
, t
);
1720 ddx
[2] = lp_build_ddx(coord_bld
, r
);
1721 ddy
[0] = lp_build_ddy(coord_bld
, s
);
1722 ddy
[1] = lp_build_ddy(coord_bld
, t
);
1723 ddy
[2] = lp_build_ddy(coord_bld
, r
);
1726 ddx
[0] = derivs_in
->ddx
[0];
1727 ddx
[1] = derivs_in
->ddx
[1];
1728 ddx
[2] = derivs_in
->ddx
[2];
1729 ddy
[0] = derivs_in
->ddy
[0];
1730 ddy
[1] = derivs_in
->ddy
[1];
1731 ddy
[2] = derivs_in
->ddy
[2];
1734 /* select major derivatives */
1735 madx
= lp_build_select3(coord_bld
, as_ge_at
, ar_ge_as_at
, ddx
[0], ddx
[1], ddx
[2]);
1736 mady
= lp_build_select3(coord_bld
, as_ge_at
, ar_ge_as_at
, ddy
[0], ddy
[1], ddy
[2]);
1738 si
= LLVMBuildBitCast(builder
, s
, cint_vec_type
, "");
1739 ti
= LLVMBuildBitCast(builder
, t
, cint_vec_type
, "");
1740 ri
= LLVMBuildBitCast(builder
, r
, cint_vec_type
, "");
1742 sdxi
= LLVMBuildBitCast(builder
, ddx
[0], cint_vec_type
, "");
1743 tdxi
= LLVMBuildBitCast(builder
, ddx
[1], cint_vec_type
, "");
1744 rdxi
= LLVMBuildBitCast(builder
, ddx
[2], cint_vec_type
, "");
1746 sdyi
= LLVMBuildBitCast(builder
, ddy
[0], cint_vec_type
, "");
1747 tdyi
= LLVMBuildBitCast(builder
, ddy
[1], cint_vec_type
, "");
1748 rdyi
= LLVMBuildBitCast(builder
, ddy
[2], cint_vec_type
, "");
1751 * compute all possible new s/t coords, which does the mirroring,
1752 * and do the same for derivs minor axes.
1753 * snewx = signma * -r;
1756 * tnewy = signma * r;
1757 * snewz = signma * s;
1760 tnegi
= LLVMBuildXor(builder
, ti
, signmask
, "");
1761 rnegi
= LLVMBuildXor(builder
, ri
, signmask
, "");
1762 tdxnegi
= LLVMBuildXor(builder
, tdxi
, signmask
, "");
1763 rdxnegi
= LLVMBuildXor(builder
, rdxi
, signmask
, "");
1764 tdynegi
= LLVMBuildXor(builder
, tdyi
, signmask
, "");
1765 rdynegi
= LLVMBuildXor(builder
, rdyi
, signmask
, "");
1767 snewx
= LLVMBuildXor(builder
, signmabit
, rnegi
, "");
1769 sdxnewx
= LLVMBuildXor(builder
, signmabit
, rdxnegi
, "");
1771 sdynewx
= LLVMBuildXor(builder
, signmabit
, rdynegi
, "");
1775 tnewy
= LLVMBuildXor(builder
, signmabit
, ri
, "");
1777 tdxnewy
= LLVMBuildXor(builder
, signmabit
, rdxi
, "");
1779 tdynewy
= LLVMBuildXor(builder
, signmabit
, rdyi
, "");
1781 snewz
= LLVMBuildXor(builder
, signmabit
, si
, "");
1783 sdxnewz
= LLVMBuildXor(builder
, signmabit
, sdxi
, "");
1785 sdynewz
= LLVMBuildXor(builder
, signmabit
, sdyi
, "");
1788 /* select the mirrored values */
1789 face
= lp_build_select3(cint_bld
, as_ge_at
, ar_ge_as_at
, facex
, facey
, facez
);
1790 face_s
= lp_build_select3(cint_bld
, as_ge_at
, ar_ge_as_at
, snewx
, snewy
, snewz
);
1791 face_t
= lp_build_select3(cint_bld
, as_ge_at
, ar_ge_as_at
, tnewx
, tnewy
, tnewz
);
1792 face_sdx
= lp_build_select3(cint_bld
, as_ge_at
, ar_ge_as_at
, sdxnewx
, sdxnewy
, sdxnewz
);
1793 face_tdx
= lp_build_select3(cint_bld
, as_ge_at
, ar_ge_as_at
, tdxnewx
, tdxnewy
, tdxnewz
);
1794 face_sdy
= lp_build_select3(cint_bld
, as_ge_at
, ar_ge_as_at
, sdynewx
, sdynewy
, sdynewz
);
1795 face_tdy
= lp_build_select3(cint_bld
, as_ge_at
, ar_ge_as_at
, tdynewx
, tdynewy
, tdynewz
);
1797 face_s
= LLVMBuildBitCast(builder
, face_s
, coord_vec_type
, "");
1798 face_t
= LLVMBuildBitCast(builder
, face_t
, coord_vec_type
, "");
1799 face_sdx
= LLVMBuildBitCast(builder
, face_sdx
, coord_vec_type
, "");
1800 face_tdx
= LLVMBuildBitCast(builder
, face_tdx
, coord_vec_type
, "");
1801 face_sdy
= LLVMBuildBitCast(builder
, face_sdy
, coord_vec_type
, "");
1802 face_tdy
= LLVMBuildBitCast(builder
, face_tdy
, coord_vec_type
, "");
1804 /* deriv math, dx.s = 0.5 * (dx.sc - sc * dx.ma / ma) / ma */
1805 madxdivma
= lp_build_mul(coord_bld
, madx
, ima
);
1806 tmp
= lp_build_mul(coord_bld
, madxdivma
, face_s
);
1807 tmp
= lp_build_sub(coord_bld
, face_sdx
, tmp
);
1808 derivs_out
->ddx
[0] = lp_build_mul(coord_bld
, tmp
, imahalf
);
1810 /* dx.t = 0.5 * (dx.tc - tc * dx.ma / ma) / ma */
1811 tmp
= lp_build_mul(coord_bld
, madxdivma
, face_t
);
1812 tmp
= lp_build_sub(coord_bld
, face_tdx
, tmp
);
1813 derivs_out
->ddx
[1] = lp_build_mul(coord_bld
, tmp
, imahalf
);
1815 /* dy.s = 0.5 * (dy.sc - sc * dy.ma / ma) / ma */
1816 madydivma
= lp_build_mul(coord_bld
, mady
, ima
);
1817 tmp
= lp_build_mul(coord_bld
, madydivma
, face_s
);
1818 tmp
= lp_build_sub(coord_bld
, face_sdy
, tmp
);
1819 derivs_out
->ddy
[0] = lp_build_mul(coord_bld
, tmp
, imahalf
);
1821 /* dy.t = 0.5 * (dy.tc - tc * dy.ma / ma) / ma */
1822 tmp
= lp_build_mul(coord_bld
, madydivma
, face_t
);
1823 tmp
= lp_build_sub(coord_bld
, face_tdy
, tmp
);
1824 derivs_out
->ddy
[1] = lp_build_mul(coord_bld
, tmp
, imahalf
);
1826 signma
= LLVMBuildLShr(builder
, mai
, signshift
, "");
1827 coords
[2] = LLVMBuildOr(builder
, face
, signma
, "face");
1829 /* project coords */
1830 face_s
= lp_build_mul(coord_bld
, face_s
, imahalfpos
);
1831 face_t
= lp_build_mul(coord_bld
, face_t
, imahalfpos
);
1833 coords
[0] = lp_build_add(coord_bld
, face_s
, posHalf
);
1834 coords
[1] = lp_build_add(coord_bld
, face_t
, posHalf
);
1839 else if (need_derivs
) {
1840 LLVMValueRef ddx_ddy
[2], tmp
[3], rho_vec
;
1841 static const unsigned char swizzle0
[] = { /* no-op swizzle */
1842 0, LP_BLD_SWIZZLE_DONTCARE
,
1843 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
1845 static const unsigned char swizzle1
[] = {
1846 1, LP_BLD_SWIZZLE_DONTCARE
,
1847 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
1849 static const unsigned char swizzle01
[] = { /* no-op swizzle */
1851 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
1853 static const unsigned char swizzle23
[] = {
1855 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
1857 static const unsigned char swizzle02
[] = {
1859 LP_BLD_SWIZZLE_DONTCARE
, LP_BLD_SWIZZLE_DONTCARE
1863 * scale the s/t/r coords pre-select/mirror so we can calculate
1864 * "reasonable" derivs.
1866 ma
= lp_build_select3(coord_bld
, as_ge_at
, ar_ge_as_at
, s
, t
, r
);
1867 imahalfpos
= lp_build_cube_imapos(coord_bld
, ma
);
1868 s
= lp_build_mul(coord_bld
, s
, imahalfpos
);
1869 t
= lp_build_mul(coord_bld
, t
, imahalfpos
);
1870 r
= lp_build_mul(coord_bld
, r
, imahalfpos
);
1873 * This isn't quite the same as the "ordinary" (3d deriv) path since we
1874 * know the texture is square which simplifies things (we can omit the
1875 * size mul which happens very early completely here and do it at the
1877 * Also always do calculations according to GALLIVM_DEBUG_NO_RHO_APPROX
1878 * since the error can get quite big otherwise at edges.
1879 * (With no_rho_approx max error is sqrt(2) at edges, same as it is
1880 * without no_rho_approx for 2d textures, otherwise it would be factor 2.)
1882 ddx_ddy
[0] = lp_build_packed_ddx_ddy_twocoord(coord_bld
, s
, t
);
1883 ddx_ddy
[1] = lp_build_packed_ddx_ddy_onecoord(coord_bld
, r
);
1885 ddx_ddy
[0] = lp_build_mul(coord_bld
, ddx_ddy
[0], ddx_ddy
[0]);
1886 ddx_ddy
[1] = lp_build_mul(coord_bld
, ddx_ddy
[1], ddx_ddy
[1]);
1888 tmp
[0] = lp_build_swizzle_aos(coord_bld
, ddx_ddy
[0], swizzle01
);
1889 tmp
[1] = lp_build_swizzle_aos(coord_bld
, ddx_ddy
[0], swizzle23
);
1890 tmp
[2] = lp_build_swizzle_aos(coord_bld
, ddx_ddy
[1], swizzle02
);
1892 rho_vec
= lp_build_add(coord_bld
, tmp
[0], tmp
[1]);
1893 rho_vec
= lp_build_add(coord_bld
, rho_vec
, tmp
[2]);
1895 tmp
[0] = lp_build_swizzle_aos(coord_bld
, rho_vec
, swizzle0
);
1896 tmp
[1] = lp_build_swizzle_aos(coord_bld
, rho_vec
, swizzle1
);
1897 *rho
= lp_build_max(coord_bld
, tmp
[0], tmp
[1]);
1901 ma
= lp_build_select3(coord_bld
, as_ge_at
, ar_ge_as_at
, s
, t
, r
);
1903 mai
= LLVMBuildBitCast(builder
, ma
, cint_vec_type
, "");
1904 signmabit
= LLVMBuildAnd(builder
, mai
, signmask
, "");
1906 si
= LLVMBuildBitCast(builder
, s
, cint_vec_type
, "");
1907 ti
= LLVMBuildBitCast(builder
, t
, cint_vec_type
, "");
1908 ri
= LLVMBuildBitCast(builder
, r
, cint_vec_type
, "");
1911 * compute all possible new s/t coords, which does the mirroring
1912 * snewx = signma * -r;
1915 * tnewy = signma * r;
1916 * snewz = signma * s;
1919 tnegi
= LLVMBuildXor(builder
, ti
, signmask
, "");
1920 rnegi
= LLVMBuildXor(builder
, ri
, signmask
, "");
1922 snewx
= LLVMBuildXor(builder
, signmabit
, rnegi
, "");
1926 tnewy
= LLVMBuildXor(builder
, signmabit
, ri
, "");
1928 snewz
= LLVMBuildXor(builder
, signmabit
, si
, "");
1931 /* select the mirrored values */
1932 face_s
= lp_build_select3(cint_bld
, as_ge_at
, ar_ge_as_at
, snewx
, snewy
, snewz
);
1933 face_t
= lp_build_select3(cint_bld
, as_ge_at
, ar_ge_as_at
, tnewx
, tnewy
, tnewz
);
1934 face
= lp_build_select3(cint_bld
, as_ge_at
, ar_ge_as_at
, facex
, facey
, facez
);
1936 face_s
= LLVMBuildBitCast(builder
, face_s
, coord_vec_type
, "");
1937 face_t
= LLVMBuildBitCast(builder
, face_t
, coord_vec_type
, "");
1939 /* add +1 for neg face */
1940 /* XXX with AVX probably want to use another select here -
1941 * as long as we ensure vblendvps gets used we can actually
1942 * skip the comparison and just use sign as a "mask" directly.
1944 signma
= LLVMBuildLShr(builder
, mai
, signshift
, "");
1945 coords
[2] = LLVMBuildOr(builder
, face
, signma
, "face");
1947 /* project coords */
1949 imahalfpos
= lp_build_cube_imapos(coord_bld
, ma
);
1950 face_s
= lp_build_mul(coord_bld
, face_s
, imahalfpos
);
1951 face_t
= lp_build_mul(coord_bld
, face_t
, imahalfpos
);
1954 coords
[0] = lp_build_add(coord_bld
, face_s
, posHalf
);
1955 coords
[1] = lp_build_add(coord_bld
, face_t
, posHalf
);
1960 * Compute the partial offset of a pixel block along an arbitrary axis.
1962 * @param coord coordinate in pixels
1963 * @param stride number of bytes between rows of successive pixel blocks
1964 * @param block_length number of pixels in a pixels block along the coordinate
1966 * @param out_offset resulting relative offset of the pixel block in bytes
1967 * @param out_subcoord resulting sub-block pixel coordinate
1970 lp_build_sample_partial_offset(struct lp_build_context
*bld
,
1971 unsigned block_length
,
1973 LLVMValueRef stride
,
1974 LLVMValueRef
*out_offset
,
1975 LLVMValueRef
*out_subcoord
)
1977 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
1978 LLVMValueRef offset
;
1979 LLVMValueRef subcoord
;
1981 if (block_length
== 1) {
1982 subcoord
= bld
->zero
;
1986 * Pixel blocks have power of two dimensions. LLVM should convert the
1987 * rem/div to bit arithmetic.
1988 * TODO: Verify this.
1989 * It does indeed BUT it does transform it to scalar (and back) when doing so
1990 * (using roughly extract, shift/and, mov, unpack) (llvm 2.7).
1991 * The generated code looks seriously unfunny and is quite expensive.
1994 LLVMValueRef block_width
= lp_build_const_int_vec(bld
->type
, block_length
);
1995 subcoord
= LLVMBuildURem(builder
, coord
, block_width
, "");
1996 coord
= LLVMBuildUDiv(builder
, coord
, block_width
, "");
1998 unsigned logbase2
= util_logbase2(block_length
);
1999 LLVMValueRef block_shift
= lp_build_const_int_vec(bld
->gallivm
, bld
->type
, logbase2
);
2000 LLVMValueRef block_mask
= lp_build_const_int_vec(bld
->gallivm
, bld
->type
, block_length
- 1);
2001 subcoord
= LLVMBuildAnd(builder
, coord
, block_mask
, "");
2002 coord
= LLVMBuildLShr(builder
, coord
, block_shift
, "");
2006 offset
= lp_build_mul(bld
, coord
, stride
);
2009 assert(out_subcoord
);
2011 *out_offset
= offset
;
2012 *out_subcoord
= subcoord
;
2017 * Compute the offset of a pixel block.
2019 * x, y, z, y_stride, z_stride are vectors, and they refer to pixels.
2021 * Returns the relative offset and i,j sub-block coordinates
2024 lp_build_sample_offset(struct lp_build_context
*bld
,
2025 const struct util_format_description
*format_desc
,
2029 LLVMValueRef y_stride
,
2030 LLVMValueRef z_stride
,
2031 LLVMValueRef
*out_offset
,
2032 LLVMValueRef
*out_i
,
2033 LLVMValueRef
*out_j
)
2035 LLVMValueRef x_stride
;
2036 LLVMValueRef offset
;
2038 x_stride
= lp_build_const_vec(bld
->gallivm
, bld
->type
,
2039 format_desc
->block
.bits
/8);
2041 lp_build_sample_partial_offset(bld
,
2042 format_desc
->block
.width
,
2046 if (y
&& y_stride
) {
2047 LLVMValueRef y_offset
;
2048 lp_build_sample_partial_offset(bld
,
2049 format_desc
->block
.height
,
2052 offset
= lp_build_add(bld
, offset
, y_offset
);
2058 if (z
&& z_stride
) {
2059 LLVMValueRef z_offset
;
2061 lp_build_sample_partial_offset(bld
,
2062 1, /* pixel blocks are always 2D */
2065 offset
= lp_build_add(bld
, offset
, z_offset
);
2068 *out_offset
= offset
;