1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
4 * Copyright 2007-2008 Tungsten Graphics, Inc., Cedar Park, Texas.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
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12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 **************************************************************************/
31 * Position and shader input interpolation.
33 * @author Jose Fonseca <jfonseca@vmware.com>
36 #include "pipe/p_shader_tokens.h"
37 #include "util/u_debug.h"
38 #include "util/u_memory.h"
39 #include "util/u_math.h"
40 #include "tgsi/tgsi_scan.h"
41 #include "gallivm/lp_bld_debug.h"
42 #include "gallivm/lp_bld_const.h"
43 #include "gallivm/lp_bld_arit.h"
44 #include "gallivm/lp_bld_swizzle.h"
45 #include "gallivm/lp_bld_flow.h"
46 #include "lp_bld_interp.h"
50 * The shader JIT function operates on blocks of quads.
51 * Each block has 2x2 quads and each quad has 2x2 pixels.
53 * We iterate over the quads in order 0, 1, 2, 3:
65 * If we iterate over multiple quads at once, quads 01 and 23 are processed
68 * Within each quad, we have four pixels which are represented in SOA
77 * So the green channel (for example) of the four pixels is stored in
78 * a single vector register: {g0, g1, g2, g3}.
79 * The order stays the same even with multiple quads:
87 * Do one perspective divide per quad.
89 * For perspective interpolation, the final attribute value is given
95 * a = a0 + dadx*x + dady*y
96 * w = w0 + dwdx*x + dwdy*y
97 * oow = 1/w = 1/(w0 + dwdx*x + dwdy*y)
99 * Instead of computing the division per pixel, with this macro we compute the
100 * division on the upper left pixel of each quad, and use a linear
101 * approximation in the remaining pixels, given by:
103 * da'dx = (dadx - dwdx*a)*oow
104 * da'dy = (dady - dwdy*a)*oow
106 * Ironically, this actually makes things slower -- probably because the
107 * divide hardware unit is rarely used, whereas the multiply unit is typically
110 #define PERSPECTIVE_DIVIDE_PER_QUAD 0
113 static const unsigned char quad_offset_x[16] = {0, 1, 0, 1, 2, 3, 2, 3, 0, 1, 0, 1, 2, 3, 2, 3};
114 static const unsigned char quad_offset_y[16] = {0, 0, 1, 1, 0, 0, 1, 1, 2, 2, 3, 3, 2, 2, 3, 3};
118 attrib_name(LLVMValueRef val, unsigned attrib, unsigned chan, const char *suffix)
121 lp_build_name(val, "pos.%c%s", "xyzw"[chan], suffix);
123 lp_build_name(val, "input%u.%c%s", attrib - 1, "xyzw"[chan], suffix);
127 calc_offsets(struct lp_build_context *coeff_bld,
128 unsigned quad_start_index,
129 LLVMValueRef *pixoffx,
130 LLVMValueRef *pixoffy)
133 unsigned num_pix = coeff_bld->type.length;
134 struct gallivm_state *gallivm = coeff_bld->gallivm;
135 LLVMBuilderRef builder = coeff_bld->gallivm->builder;
136 LLVMValueRef nr, pixxf, pixyf;
138 *pixoffx = coeff_bld->undef;
139 *pixoffy = coeff_bld->undef;
141 for (i = 0; i < num_pix; i++) {
142 nr = lp_build_const_int32(gallivm, i);
143 pixxf = lp_build_const_float(gallivm, quad_offset_x[i % num_pix] +
144 (quad_start_index & 1) * 2);
145 pixyf = lp_build_const_float(gallivm, quad_offset_y[i % num_pix] +
146 (quad_start_index & 2));
147 *pixoffx = LLVMBuildInsertElement(builder, *pixoffx, pixxf, nr, "");
148 *pixoffy = LLVMBuildInsertElement(builder, *pixoffy, pixyf, nr, "");
153 /* Much easier, and significantly less instructions in the per-stamp
154 * part (less than half) but overall more instructions so a loss if
155 * most quads are active. Might be a win though with larger vectors.
156 * No ability to do per-quad divide (doable but not implemented)
157 * Could be made to work with passed in pixel offsets (i.e. active quad merging).
160 coeffs_init_simple(struct lp_build_interp_soa_context *bld,
162 LLVMValueRef dadx_ptr,
163 LLVMValueRef dady_ptr)
165 struct lp_build_context *coeff_bld = &bld->coeff_bld;
166 struct lp_build_context *setup_bld = &bld->setup_bld;
167 struct gallivm_state *gallivm = coeff_bld->gallivm;
168 LLVMBuilderRef builder = gallivm->builder;
171 for (attrib = 0; attrib < bld->num_attribs; ++attrib) {
173 * always fetch all 4 values for performance/simplicity
174 * Note: we do that here because it seems to generate better
175 * code. It generates a lot of moves initially but less
176 * moves later. As far as I can tell this looks like a
177 * llvm issue, instead of simply reloading the values from
178 * the passed in pointers it if it runs out of registers
179 * it spills/reloads them. Maybe some optimization passes
181 * Might want to investigate this again later.
183 const unsigned interp = bld->interp[attrib];
184 LLVMValueRef index = lp_build_const_int32(gallivm,
185 attrib * TGSI_NUM_CHANNELS);
187 LLVMValueRef dadxaos = setup_bld->zero;
188 LLVMValueRef dadyaos = setup_bld->zero;
189 LLVMValueRef a0aos = setup_bld->zero;
192 case LP_INTERP_PERSPECTIVE:
195 case LP_INTERP_LINEAR:
196 ptr = LLVMBuildGEP(builder, dadx_ptr, &index, 1, "");
197 ptr = LLVMBuildBitCast(builder, ptr,
198 LLVMPointerType(setup_bld->vec_type, 0), "");
199 dadxaos = LLVMBuildLoad(builder, ptr, "");
201 ptr = LLVMBuildGEP(builder, dady_ptr, &index, 1, "");
202 ptr = LLVMBuildBitCast(builder, ptr,
203 LLVMPointerType(setup_bld->vec_type, 0), "");
204 dadyaos = LLVMBuildLoad(builder, ptr, "");
206 attrib_name(dadxaos, attrib, 0, ".dadxaos");
207 attrib_name(dadyaos, attrib, 0, ".dadyaos");
210 case LP_INTERP_CONSTANT:
211 case LP_INTERP_FACING:
212 ptr = LLVMBuildGEP(builder, a0_ptr, &index, 1, "");
213 ptr = LLVMBuildBitCast(builder, ptr,
214 LLVMPointerType(setup_bld->vec_type, 0), "");
215 a0aos = LLVMBuildLoad(builder, ptr, "");
216 attrib_name(a0aos, attrib, 0, ".a0aos");
219 case LP_INTERP_POSITION:
220 /* Nothing to do as the position coeffs are already setup in slot 0 */
227 bld->a0aos[attrib] = a0aos;
228 bld->dadxaos[attrib] = dadxaos;
229 bld->dadyaos[attrib] = dadyaos;
234 * Interpolate the shader input attribute values.
235 * This is called for each (group of) quad(s).
238 attribs_update_simple(struct lp_build_interp_soa_context *bld,
239 struct gallivm_state *gallivm,
240 int quad_start_index,
241 LLVMValueRef loop_iter,
245 LLVMBuilderRef builder = gallivm->builder;
246 struct lp_build_context *coeff_bld = &bld->coeff_bld;
247 struct lp_build_context *setup_bld = &bld->setup_bld;
248 LLVMValueRef oow = NULL;
250 LLVMValueRef pixoffx;
251 LLVMValueRef pixoffy;
253 /* could do this with code-generated passed in pixel offsets too */
254 if (bld->dynamic_offsets) {
258 ptr = LLVMBuildGEP(builder, bld->xoffset_store, &loop_iter, 1, "");
259 pixoffx = LLVMBuildLoad(builder, ptr, "");
260 ptr = LLVMBuildGEP(builder, bld->yoffset_store, &loop_iter, 1, "");
261 pixoffy = LLVMBuildLoad(builder, ptr, "");
264 calc_offsets(coeff_bld, quad_start_index, &pixoffx, &pixoffy);
267 pixoffx = LLVMBuildFAdd(builder, pixoffx,
268 lp_build_broadcast_scalar(coeff_bld, bld->x), "");
269 pixoffy = LLVMBuildFAdd(builder, pixoffy,
270 lp_build_broadcast_scalar(coeff_bld, bld->y), "");
272 for (attrib = start; attrib < end; attrib++) {
273 const unsigned mask = bld->mask[attrib];
274 const unsigned interp = bld->interp[attrib];
277 for (chan = 0; chan < TGSI_NUM_CHANNELS; chan++) {
278 if (mask & (1 << chan)) {
280 LLVMValueRef dadx = coeff_bld->zero;
281 LLVMValueRef dady = coeff_bld->zero;
282 LLVMValueRef a = coeff_bld->zero;
284 index = lp_build_const_int32(gallivm, chan);
286 case LP_INTERP_PERSPECTIVE:
289 case LP_INTERP_LINEAR:
290 if (attrib == 0 && chan == 0) {
291 dadx = coeff_bld->one;
293 else if (attrib == 0 && chan == 1) {
294 dady = coeff_bld->one;
297 dadx = lp_build_extract_broadcast(gallivm, setup_bld->type,
298 coeff_bld->type, bld->dadxaos[attrib],
300 dady = lp_build_extract_broadcast(gallivm, setup_bld->type,
301 coeff_bld->type, bld->dadyaos[attrib],
303 a = lp_build_extract_broadcast(gallivm, setup_bld->type,
304 coeff_bld->type, bld->a0aos[attrib],
308 * a = a0 + (x * dadx + y * dady)
310 dadx = LLVMBuildFMul(builder, dadx, pixoffx, "");
311 dady = LLVMBuildFMul(builder, dady, pixoffy, "");
312 a = LLVMBuildFAdd(builder, a, dadx, "");
313 a = LLVMBuildFAdd(builder, a, dady, "");
315 if (interp == LP_INTERP_PERSPECTIVE) {
317 LLVMValueRef w = bld->attribs[0][3];
319 assert(bld->mask[0] & TGSI_WRITEMASK_W);
320 oow = lp_build_rcp(coeff_bld, w);
322 a = lp_build_mul(coeff_bld, a, oow);
326 case LP_INTERP_CONSTANT:
327 case LP_INTERP_FACING:
328 a = lp_build_extract_broadcast(gallivm, setup_bld->type,
329 coeff_bld->type, bld->a0aos[attrib],
333 case LP_INTERP_POSITION:
335 a = bld->attribs[0][chan];
343 if ((attrib == 0) && (chan == 2)){
344 /* FIXME: Depth values can exceed 1.0, due to the fact that
345 * setup interpolation coefficients refer to (0,0) which causes
346 * precision loss. So we must clamp to 1.0 here to avoid artifacts
348 a = lp_build_min(coeff_bld, a, coeff_bld->one);
350 bld->attribs[attrib][chan] = a;
357 * Initialize the bld->a, dadq fields. This involves fetching
358 * those values from the arrays which are passed into the JIT function.
361 coeffs_init(struct lp_build_interp_soa_context *bld,
363 LLVMValueRef dadx_ptr,
364 LLVMValueRef dady_ptr)
366 struct lp_build_context *coeff_bld = &bld->coeff_bld;
367 struct lp_build_context *setup_bld = &bld->setup_bld;
368 struct gallivm_state *gallivm = coeff_bld->gallivm;
369 LLVMBuilderRef builder = gallivm->builder;
370 LLVMValueRef pixoffx, pixoffy;
375 pixoffx = coeff_bld->undef;
376 pixoffy = coeff_bld->undef;
377 for (i = 0; i < coeff_bld->type.length; i++) {
378 LLVMValueRef nr = lp_build_const_int32(gallivm, i);
379 LLVMValueRef pixxf = lp_build_const_float(gallivm, quad_offset_x[i]);
380 LLVMValueRef pixyf = lp_build_const_float(gallivm, quad_offset_y[i]);
381 pixoffx = LLVMBuildInsertElement(builder, pixoffx, pixxf, nr, "");
382 pixoffy = LLVMBuildInsertElement(builder, pixoffy, pixyf, nr, "");
386 for (attrib = 0; attrib < bld->num_attribs; ++attrib) {
387 const unsigned mask = bld->mask[attrib];
388 const unsigned interp = bld->interp[attrib];
389 LLVMValueRef index = lp_build_const_int32(gallivm,
390 attrib * TGSI_NUM_CHANNELS);
392 LLVMValueRef dadxaos = setup_bld->zero;
393 LLVMValueRef dadyaos = setup_bld->zero;
394 LLVMValueRef a0aos = setup_bld->zero;
396 /* always fetch all 4 values for performance/simplicity */
398 case LP_INTERP_PERSPECTIVE:
401 case LP_INTERP_LINEAR:
402 ptr = LLVMBuildGEP(builder, dadx_ptr, &index, 1, "");
403 ptr = LLVMBuildBitCast(builder, ptr,
404 LLVMPointerType(setup_bld->vec_type, 0), "");
405 dadxaos = LLVMBuildLoad(builder, ptr, "");
407 ptr = LLVMBuildGEP(builder, dady_ptr, &index, 1, "");
408 ptr = LLVMBuildBitCast(builder, ptr,
409 LLVMPointerType(setup_bld->vec_type, 0), "");
410 dadyaos = LLVMBuildLoad(builder, ptr, "");
412 attrib_name(dadxaos, attrib, 0, ".dadxaos");
413 attrib_name(dadyaos, attrib, 0, ".dadyaos");
416 case LP_INTERP_CONSTANT:
417 case LP_INTERP_FACING:
418 ptr = LLVMBuildGEP(builder, a0_ptr, &index, 1, "");
419 ptr = LLVMBuildBitCast(builder, ptr,
420 LLVMPointerType(setup_bld->vec_type, 0), "");
421 a0aos = LLVMBuildLoad(builder, ptr, "");
422 attrib_name(a0aos, attrib, 0, ".a0aos");
425 case LP_INTERP_POSITION:
426 /* Nothing to do as the position coeffs are already setup in slot 0 */
435 * a = a0 + (x * dadx + y * dady)
436 * a0aos is the attrib value at top left corner of stamp
438 if (interp != LP_INTERP_CONSTANT &&
439 interp != LP_INTERP_FACING) {
440 LLVMValueRef axaos, ayaos;
441 axaos = LLVMBuildFMul(builder, lp_build_broadcast_scalar(setup_bld, bld->x),
443 ayaos = LLVMBuildFMul(builder, lp_build_broadcast_scalar(setup_bld, bld->y),
445 a0aos = LLVMBuildFAdd(builder, a0aos, ayaos, "");
446 a0aos = LLVMBuildFAdd(builder, a0aos, axaos, "");
450 * dadq = {0, dadx, dady, dadx + dady}
451 * for two quads (side by side) this is:
452 * {0, dadx, dady, dadx+dady, 2*dadx, 2*dadx+dady, 3*dadx+dady}
454 for (chan = 0; chan < TGSI_NUM_CHANNELS; ++chan) {
455 /* this generates a CRAPLOAD of shuffles... */
456 if (mask & (1 << chan)) {
457 LLVMValueRef dadx, dady;
458 LLVMValueRef dadq, dadq2;
460 LLVMValueRef chan_index = lp_build_const_int32(gallivm, chan);
462 if (attrib == 0 && chan == 0) {
463 a = lp_build_broadcast_scalar(coeff_bld, bld->x);
464 dadx = coeff_bld->one;
465 dady = coeff_bld->zero;
467 else if (attrib == 0 && chan == 1) {
468 a = lp_build_broadcast_scalar(coeff_bld, bld->y);
469 dady = coeff_bld->one;
470 dadx = coeff_bld->zero;
473 dadx = lp_build_extract_broadcast(gallivm, setup_bld->type,
474 coeff_bld->type, dadxaos, chan_index);
475 dady = lp_build_extract_broadcast(gallivm, setup_bld->type,
476 coeff_bld->type, dadyaos, chan_index);
481 a = lp_build_extract_broadcast(gallivm, setup_bld->type,
482 coeff_bld->type, a0aos, chan_index);
485 dadx = LLVMBuildFMul(builder, dadx, pixoffx, "");
486 dady = LLVMBuildFMul(builder, dady, pixoffy, "");
487 dadq = LLVMBuildFAdd(builder, dadx, dady, "");
490 * Compute the attrib values on the upper-left corner of each
492 * Note that if we process 2 quads at once this doesn't
493 * really exactly to what we want.
494 * We need to access elem 0 and 2 respectively later if we process
498 if (interp != LP_INTERP_CONSTANT &&
499 interp != LP_INTERP_FACING) {
500 dadq2 = LLVMBuildFAdd(builder, dadq, dadq, "");
501 a = LLVMBuildFAdd(builder, a, dadq2, "");
504 #if PERSPECTIVE_DIVIDE_PER_QUAD
510 * XXX since we're only going to access elements 0,2 out of 8
511 * if we have 8-wide vectors we should do the division only 4-wide.
512 * a is really a 2-elements in a 4-wide vector disguised as 8-wide
515 if (interp == LP_INTERP_PERSPECTIVE) {
516 LLVMValueRef w = bld->a[0][3];
518 assert(bld->mask[0] & TGSI_WRITEMASK_W);
520 bld->oow = lp_build_rcp(coeff_bld, w);
521 lp_build_name(bld->oow, "oow");
523 a = lp_build_mul(coeff_bld, a, bld->oow);
527 attrib_name(a, attrib, chan, ".a");
528 attrib_name(dadq, attrib, chan, ".dadq");
530 if (bld->dynamic_offsets) {
531 bld->a[attrib][chan] = lp_build_alloca(gallivm,
533 LLVMBuildStore(builder, a, bld->a[attrib][chan]);
536 bld->a[attrib][chan] = a;
538 bld->dadq[attrib][chan] = dadq;
546 * Increment the shader input attribute values.
547 * This is called when we move from one quad to the next.
550 attribs_update(struct lp_build_interp_soa_context *bld,
551 struct gallivm_state *gallivm,
552 int quad_start_index,
553 LLVMValueRef loop_iter,
557 LLVMBuilderRef builder = gallivm->builder;
558 struct lp_build_context *coeff_bld = &bld->coeff_bld;
559 LLVMValueRef shuffle = lp_build_const_int_vec(gallivm, coeff_bld->type, quad_start_index);
560 LLVMValueRef oow = NULL;
564 assert(quad_start_index < 4);
566 for(attrib = start; attrib < end; ++attrib) {
567 const unsigned mask = bld->mask[attrib];
568 const unsigned interp = bld->interp[attrib];
569 for(chan = 0; chan < TGSI_NUM_CHANNELS; ++chan) {
570 if(mask & (1 << chan)) {
572 if (interp == LP_INTERP_CONSTANT ||
573 interp == LP_INTERP_FACING) {
574 a = bld->a[attrib][chan];
575 if (bld->dynamic_offsets) {
576 a = LLVMBuildLoad(builder, a, "");
579 else if (interp == LP_INTERP_POSITION) {
581 a = bld->attribs[0][chan];
586 a = bld->a[attrib][chan];
589 * Broadcast the attribute value for this quad into all elements
592 if (bld->dynamic_offsets) {
593 /* stored as vector load as float */
594 LLVMTypeRef ptr_type = LLVMPointerType(LLVMFloatTypeInContext(
595 gallivm->context), 0);
597 a = LLVMBuildBitCast(builder, a, ptr_type, "");
598 ptr = LLVMBuildGEP(builder, a, &loop_iter, 1, "");
599 a = LLVMBuildLoad(builder, ptr, "");
600 a = lp_build_broadcast_scalar(&bld->coeff_bld, a);
603 a = LLVMBuildShuffleVector(builder,
604 a, coeff_bld->undef, shuffle, "");
608 * Get the derivatives.
611 dadq = bld->dadq[attrib][chan];
613 #if PERSPECTIVE_DIVIDE_PER_QUAD
614 if (interp == LP_INTERP_PERSPECTIVE) {
615 LLVMValueRef dwdq = bld->dadq[0][3];
619 oow = LLVMBuildShuffleVector(coeff_bld->builder,
620 bld->oow, coeff_bld->undef,
624 dadq = lp_build_sub(coeff_bld,
626 lp_build_mul(coeff_bld, a, dwdq));
627 dadq = lp_build_mul(coeff_bld, dadq, oow);
632 * Add the derivatives
635 a = lp_build_add(coeff_bld, a, dadq);
637 #if !PERSPECTIVE_DIVIDE_PER_QUAD
638 if (interp == LP_INTERP_PERSPECTIVE) {
640 LLVMValueRef w = bld->attribs[0][3];
642 assert(bld->mask[0] & TGSI_WRITEMASK_W);
643 oow = lp_build_rcp(coeff_bld, w);
645 a = lp_build_mul(coeff_bld, a, oow);
649 if (attrib == 0 && chan == 2) {
650 /* FIXME: Depth values can exceed 1.0, due to the fact that
651 * setup interpolation coefficients refer to (0,0) which causes
652 * precision loss. So we must clamp to 1.0 here to avoid artifacts
654 a = lp_build_min(coeff_bld, a, coeff_bld->one);
657 attrib_name(a, attrib, chan, "");
659 bld->attribs[attrib][chan] = a;
667 * Generate the position vectors.
669 * Parameter x0, y0 are the integer values with upper left coordinates.
672 pos_init(struct lp_build_interp_soa_context *bld,
676 LLVMBuilderRef builder = bld->coeff_bld.gallivm->builder;
677 struct lp_build_context *coeff_bld = &bld->coeff_bld;
679 bld->x = LLVMBuildSIToFP(builder, x0, coeff_bld->elem_type, "");
680 bld->y = LLVMBuildSIToFP(builder, y0, coeff_bld->elem_type, "");
685 * Initialize fragment shader input attribute info.
688 lp_build_interp_soa_init(struct lp_build_interp_soa_context *bld,
689 struct gallivm_state *gallivm,
691 const struct lp_shader_input *inputs,
692 LLVMBuilderRef builder,
694 boolean dynamic_offsets,
696 LLVMValueRef dadx_ptr,
697 LLVMValueRef dady_ptr,
701 struct lp_type coeff_type;
702 struct lp_type setup_type;
706 memset(bld, 0, sizeof *bld);
708 memset(&coeff_type, 0, sizeof coeff_type);
709 coeff_type.floating = TRUE;
710 coeff_type.sign = TRUE;
711 coeff_type.width = 32;
712 coeff_type.length = type.length;
714 memset(&setup_type, 0, sizeof setup_type);
715 setup_type.floating = TRUE;
716 setup_type.sign = TRUE;
717 setup_type.width = 32;
718 setup_type.length = TGSI_NUM_CHANNELS;
721 /* XXX: we don't support interpolating into any other types */
722 assert(memcmp(&coeff_type, &type, sizeof coeff_type) == 0);
724 lp_build_context_init(&bld->coeff_bld, gallivm, coeff_type);
725 lp_build_context_init(&bld->setup_bld, gallivm, setup_type);
727 /* For convenience */
728 bld->pos = bld->attribs[0];
729 bld->inputs = (const LLVMValueRef (*)[TGSI_NUM_CHANNELS]) bld->attribs[1];
732 bld->mask[0] = TGSI_WRITEMASK_XYZW;
733 bld->interp[0] = LP_INTERP_LINEAR;
736 for (attrib = 0; attrib < num_inputs; ++attrib) {
737 bld->mask[1 + attrib] = inputs[attrib].usage_mask;
738 bld->interp[1 + attrib] = inputs[attrib].interp;
740 bld->num_attribs = 1 + num_inputs;
742 /* Ensure all masked out input channels have a valid value */
743 for (attrib = 0; attrib < bld->num_attribs; ++attrib) {
744 for (chan = 0; chan < TGSI_NUM_CHANNELS; ++chan) {
745 bld->attribs[attrib][chan] = bld->coeff_bld.undef;
749 pos_init(bld, x0, y0);
751 if (coeff_type.length > 4) {
752 bld->simple_interp = TRUE;
753 if (dynamic_offsets) {
754 /* XXX this should use a global static table */
756 unsigned num_loops = 16 / type.length;
757 LLVMValueRef pixoffx, pixoffy, index;
760 bld->dynamic_offsets = TRUE;
761 bld->xoffset_store = lp_build_array_alloca(gallivm,
762 lp_build_vec_type(gallivm, type),
763 lp_build_const_int32(gallivm, num_loops),
765 bld->yoffset_store = lp_build_array_alloca(gallivm,
766 lp_build_vec_type(gallivm, type),
767 lp_build_const_int32(gallivm, num_loops),
769 for (i = 0; i < num_loops; i++) {
770 index = lp_build_const_int32(gallivm, i);
771 calc_offsets(&bld->coeff_bld, i*type.length/4, &pixoffx, &pixoffy);
772 ptr = LLVMBuildGEP(builder, bld->xoffset_store, &index, 1, "");
773 LLVMBuildStore(builder, pixoffx, ptr);
774 ptr = LLVMBuildGEP(builder, bld->yoffset_store, &index, 1, "");
775 LLVMBuildStore(builder, pixoffy, ptr);
778 coeffs_init_simple(bld, a0_ptr, dadx_ptr, dady_ptr);
781 bld->simple_interp = FALSE;
782 if (dynamic_offsets) {
783 bld->dynamic_offsets = TRUE;
785 coeffs_init(bld, a0_ptr, dadx_ptr, dady_ptr);
792 * Advance the position and inputs to the given quad within the block.
795 lp_build_interp_soa_update_inputs(struct lp_build_interp_soa_context *bld,
796 struct gallivm_state *gallivm,
797 int quad_start_index)
799 assert(quad_start_index < 4);
801 if (bld->simple_interp) {
802 attribs_update_simple(bld, gallivm, quad_start_index, NULL, 1, bld->num_attribs);
805 attribs_update(bld, gallivm, quad_start_index, NULL, 1, bld->num_attribs);
810 lp_build_interp_soa_update_pos(struct lp_build_interp_soa_context *bld,
811 struct gallivm_state *gallivm,
812 int quad_start_index)
814 assert(quad_start_index < 4);
816 if (bld->simple_interp) {
817 attribs_update_simple(bld, gallivm, quad_start_index, NULL, 0, 1);
820 attribs_update(bld, gallivm, quad_start_index, NULL, 0, 1);
825 lp_build_interp_soa_update_inputs_dyn(struct lp_build_interp_soa_context *bld,
826 struct gallivm_state *gallivm,
827 LLVMValueRef quad_start_index)
829 if (bld->simple_interp) {
830 attribs_update_simple(bld, gallivm, 0, quad_start_index, 1, bld->num_attribs);
833 attribs_update(bld, gallivm, 0, quad_start_index, 1, bld->num_attribs);
838 lp_build_interp_soa_update_pos_dyn(struct lp_build_interp_soa_context *bld,
839 struct gallivm_state *gallivm,
840 LLVMValueRef quad_start_index)
842 if (bld->simple_interp) {
843 attribs_update_simple(bld, gallivm, 0, quad_start_index, 0, 1);
846 attribs_update(bld, gallivm, 0, quad_start_index, 0, 1);