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 * Depth/stencil testing to LLVM IR translation.
32 * To be done accurately/efficiently the depth/stencil test must be done with
33 * the same type/format of the depth/stencil buffer, which implies massaging
34 * the incoming depths to fit into place. Using a more straightforward
35 * type/format for depth/stencil values internally and only convert when
36 * flushing would avoid this, but it would most likely result in depth fighting
39 * We are free to use a different pixel layout though. Since our basic
40 * processing unit is a quad (2x2 pixel block) we store the depth/stencil
41 * values tiled, a quad at time. That is, a depth buffer containing
49 * will actually be stored in memory as
51 * Z11 Z12 Z21 Z22 Z13 Z14 Z23 Z24 ...
52 * Z31 Z32 Z41 Z42 Z33 Z34 Z43 Z44 ...
53 * ... ... ... ... ... ... ... ... ...
57 * Two-sided stencil test is supported but probably not as efficient as
58 * it could be. Currently, we use if/then/else constructs to do the
59 * operations for front vs. back-facing polygons. We could probably do
60 * both the front and back arithmetic then use a Select() instruction to
61 * choose the result depending on polyon orientation. We'd have to
62 * measure performance both ways and see which is better.
64 * @author Jose Fonseca <jfonseca@vmware.com>
67 #include "pipe/p_state.h"
68 #include "util/u_format.h"
70 #include "gallivm/lp_bld_type.h"
71 #include "gallivm/lp_bld_arit.h"
72 #include "gallivm/lp_bld_bitarit.h"
73 #include "gallivm/lp_bld_const.h"
74 #include "gallivm/lp_bld_conv.h"
75 #include "gallivm/lp_bld_logic.h"
76 #include "gallivm/lp_bld_flow.h"
77 #include "gallivm/lp_bld_intr.h"
78 #include "gallivm/lp_bld_debug.h"
79 #include "gallivm/lp_bld_swizzle.h"
81 #include "lp_bld_depth.h"
84 /** Used to select fields from pipe_stencil_state */
94 * Do the stencil test comparison (compare FB stencil values against ref value).
95 * This will be used twice when generating two-sided stencil code.
96 * \param stencil the front/back stencil state
97 * \param stencilRef the stencil reference value, replicated as a vector
98 * \param stencilVals vector of stencil values from framebuffer
99 * \return vector mask of pass/fail values (~0 or 0)
102 lp_build_stencil_test_single(struct lp_build_context *bld,
103 const struct pipe_stencil_state *stencil,
104 LLVMValueRef stencilRef,
105 LLVMValueRef stencilVals)
107 const unsigned stencilMax = 255; /* XXX fix */
108 struct lp_type type = bld->type;
113 assert(stencil->enabled);
115 if (stencil->valuemask != stencilMax) {
116 /* compute stencilRef = stencilRef & valuemask */
117 LLVMValueRef valuemask = lp_build_const_int_vec(type, stencil->valuemask);
118 stencilRef = LLVMBuildAnd(bld->builder, stencilRef, valuemask, "");
119 /* compute stencilVals = stencilVals & valuemask */
120 stencilVals = LLVMBuildAnd(bld->builder, stencilVals, valuemask, "");
123 res = lp_build_cmp(bld, stencil->func, stencilRef, stencilVals);
130 * Do the one or two-sided stencil test comparison.
131 * \sa lp_build_stencil_test_single
132 * \param front_facing an integer vector mask, indicating front (~0) or back
133 * (0) facing polygon. If NULL, assume front-facing.
136 lp_build_stencil_test(struct lp_build_context *bld,
137 const struct pipe_stencil_state stencil[2],
138 LLVMValueRef stencilRefs[2],
139 LLVMValueRef stencilVals,
140 LLVMValueRef front_facing)
144 assert(stencil[0].enabled);
146 /* do front face test */
147 res = lp_build_stencil_test_single(bld, &stencil[0],
148 stencilRefs[0], stencilVals);
150 if (stencil[1].enabled && front_facing) {
151 /* do back face test */
152 LLVMValueRef back_res;
154 back_res = lp_build_stencil_test_single(bld, &stencil[1],
155 stencilRefs[1], stencilVals);
157 res = lp_build_select(bld, front_facing, res, back_res);
165 * Apply the stencil operator (add/sub/keep/etc) to the given vector
167 * \return new stencil values vector
170 lp_build_stencil_op_single(struct lp_build_context *bld,
171 const struct pipe_stencil_state *stencil,
173 LLVMValueRef stencilRef,
174 LLVMValueRef stencilVals)
177 struct lp_type type = bld->type;
179 LLVMValueRef max = lp_build_const_int_vec(type, 0xff);
186 stencil_op = stencil->fail_op;
189 stencil_op = stencil->zfail_op;
192 stencil_op = stencil->zpass_op;
195 assert(0 && "Invalid stencil_op mode");
196 stencil_op = PIPE_STENCIL_OP_KEEP;
199 switch (stencil_op) {
200 case PIPE_STENCIL_OP_KEEP:
202 /* we can return early for this case */
204 case PIPE_STENCIL_OP_ZERO:
207 case PIPE_STENCIL_OP_REPLACE:
210 case PIPE_STENCIL_OP_INCR:
211 res = lp_build_add(bld, stencilVals, bld->one);
212 res = lp_build_min(bld, res, max);
214 case PIPE_STENCIL_OP_DECR:
215 res = lp_build_sub(bld, stencilVals, bld->one);
216 res = lp_build_max(bld, res, bld->zero);
218 case PIPE_STENCIL_OP_INCR_WRAP:
219 res = lp_build_add(bld, stencilVals, bld->one);
220 res = LLVMBuildAnd(bld->builder, res, max, "");
222 case PIPE_STENCIL_OP_DECR_WRAP:
223 res = lp_build_sub(bld, stencilVals, bld->one);
224 res = LLVMBuildAnd(bld->builder, res, max, "");
226 case PIPE_STENCIL_OP_INVERT:
227 res = LLVMBuildNot(bld->builder, stencilVals, "");
228 res = LLVMBuildAnd(bld->builder, res, max, "");
231 assert(0 && "bad stencil op mode");
240 * Do the one or two-sided stencil test op/update.
243 lp_build_stencil_op(struct lp_build_context *bld,
244 const struct pipe_stencil_state stencil[2],
246 LLVMValueRef stencilRefs[2],
247 LLVMValueRef stencilVals,
249 LLVMValueRef front_facing)
254 assert(stencil[0].enabled);
256 /* do front face op */
257 res = lp_build_stencil_op_single(bld, &stencil[0], op,
258 stencilRefs[0], stencilVals);
260 if (stencil[1].enabled && front_facing) {
261 /* do back face op */
262 LLVMValueRef back_res;
264 back_res = lp_build_stencil_op_single(bld, &stencil[1], op,
265 stencilRefs[1], stencilVals);
267 res = lp_build_select(bld, front_facing, res, back_res);
270 if (stencil->writemask != 0xff) {
271 /* mask &= stencil->writemask */
272 LLVMValueRef writemask = lp_build_const_int_vec(bld->type, stencil->writemask);
273 mask = LLVMBuildAnd(bld->builder, mask, writemask, "");
274 /* res = (res & mask) | (stencilVals & ~mask) */
275 res = lp_build_select_bitwise(bld, writemask, res, stencilVals);
278 /* res = mask ? res : stencilVals */
279 res = lp_build_select(bld, mask, res, stencilVals);
288 * Return a type appropriate for depth/stencil testing.
291 lp_depth_type(const struct util_format_description *format_desc,
297 assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS);
298 assert(format_desc->block.width == 1);
299 assert(format_desc->block.height == 1);
301 swizzle = format_desc->swizzle[0];
304 memset(&type, 0, sizeof type);
305 type.width = format_desc->block.bits;
307 if(format_desc->channel[swizzle].type == UTIL_FORMAT_TYPE_FLOAT) {
308 type.floating = TRUE;
309 assert(swizzle == 0);
310 assert(format_desc->channel[swizzle].size == format_desc->block.bits);
312 else if(format_desc->channel[swizzle].type == UTIL_FORMAT_TYPE_UNSIGNED) {
313 assert(format_desc->block.bits <= 32);
314 if(format_desc->channel[swizzle].normalized)
320 assert(type.width <= length);
321 type.length = length / type.width;
328 * Compute bitmask and bit shift to apply to the incoming fragment Z values
329 * and the Z buffer values needed before doing the Z comparison.
331 * Note that we leave the Z bits in the position that we find them
332 * in the Z buffer (typically 0xffffff00 or 0x00ffffff). That lets us
333 * get by with fewer bit twiddling steps.
336 get_z_shift_and_mask(const struct util_format_description *format_desc,
337 unsigned *shift, unsigned *mask)
339 const unsigned total_bits = format_desc->block.bits;
342 unsigned padding_left, padding_right;
344 assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS);
345 assert(format_desc->block.width == 1);
346 assert(format_desc->block.height == 1);
348 z_swizzle = format_desc->swizzle[0];
350 if (z_swizzle == UTIL_FORMAT_SWIZZLE_NONE)
354 for (chan = 0; chan < z_swizzle; ++chan)
355 padding_right += format_desc->channel[chan].size;
358 total_bits - (padding_right + format_desc->channel[z_swizzle].size);
360 if (padding_left || padding_right) {
361 unsigned long long mask_left = (1ULL << (total_bits - padding_left)) - 1;
362 unsigned long long mask_right = (1ULL << (padding_right)) - 1;
363 *mask = mask_left ^ mask_right;
369 *shift = padding_left;
376 * Compute bitmask and bit shift to apply to the framebuffer pixel values
377 * to put the stencil bits in the least significant position.
381 get_s_shift_and_mask(const struct util_format_description *format_desc,
382 unsigned *shift, unsigned *mask)
387 s_swizzle = format_desc->swizzle[1];
389 if (s_swizzle == UTIL_FORMAT_SWIZZLE_NONE)
393 for (chan = 0; chan < s_swizzle; chan++)
394 *shift += format_desc->channel[chan].size;
396 sz = format_desc->channel[s_swizzle].size;
397 *mask = (1U << sz) - 1U;
404 * Perform the occlusion test and increase the counter.
405 * Test the depth mask. Add the number of channel which has none zero mask
406 * into the occlusion counter. e.g. maskvalue is {-1, -1, -1, -1}.
407 * The counter will add 4.
409 * \param type holds element type of the mask vector.
410 * \param maskvalue is the depth test mask.
411 * \param counter is a pointer of the uint32 counter.
414 lp_build_occlusion_count(LLVMBuilderRef builder,
416 LLVMValueRef maskvalue,
417 LLVMValueRef counter)
419 LLVMValueRef countmask = lp_build_const_int_vec(type, 1);
420 LLVMValueRef countv = LLVMBuildAnd(builder, maskvalue, countmask, "countv");
421 LLVMTypeRef i8v16 = LLVMVectorType(LLVMInt8Type(), 16);
422 LLVMValueRef counti = LLVMBuildBitCast(builder, countv, i8v16, "counti");
423 LLVMValueRef maskarray[4] = {
424 LLVMConstInt(LLVMInt32Type(), 0, 0),
425 LLVMConstInt(LLVMInt32Type(), 4, 0),
426 LLVMConstInt(LLVMInt32Type(), 8, 0),
427 LLVMConstInt(LLVMInt32Type(), 12, 0),
429 LLVMValueRef shufflemask = LLVMConstVector(maskarray, 4);
430 LLVMValueRef shufflev = LLVMBuildShuffleVector(builder, counti, LLVMGetUndef(i8v16), shufflemask, "shufflev");
431 LLVMValueRef shuffle = LLVMBuildBitCast(builder, shufflev, LLVMInt32Type(), "shuffle");
432 LLVMValueRef count = lp_build_intrinsic_unary(builder, "llvm.ctpop.i32", LLVMInt32Type(), shuffle);
433 LLVMValueRef orig = LLVMBuildLoad(builder, counter, "orig");
434 LLVMValueRef incr = LLVMBuildAdd(builder, orig, count, "incr");
435 LLVMBuildStore(builder, incr, counter);
441 * Generate code for performing depth and/or stencil tests.
442 * We operate on a vector of values (typically a 2x2 quad).
444 * \param depth the depth test state
445 * \param stencil the front/back stencil state
446 * \param type the data type of the fragment depth/stencil values
447 * \param format_desc description of the depth/stencil surface
448 * \param mask the alive/dead pixel mask for the quad (vector)
449 * \param stencil_refs the front/back stencil ref values (scalar)
450 * \param z_src the incoming depth/stencil values (a 2x2 quad, float32)
451 * \param zs_dst_ptr pointer to depth/stencil values in framebuffer
452 * \param facing contains float value indicating front/back facing polygon
455 lp_build_depth_stencil_test(LLVMBuilderRef builder,
456 const struct pipe_depth_state *depth,
457 const struct pipe_stencil_state stencil[2],
458 struct lp_type z_src_type,
459 const struct util_format_description *format_desc,
460 struct lp_build_mask_context *mask,
461 LLVMValueRef stencil_refs[2],
463 LLVMValueRef zs_dst_ptr,
465 LLVMValueRef *zs_value,
469 struct lp_build_context bld;
470 struct lp_build_context sbld;
471 struct lp_type s_type;
472 LLVMValueRef zs_dst, z_dst = NULL;
473 LLVMValueRef stencil_vals = NULL;
474 LLVMValueRef z_bitmask = NULL, stencil_shift = NULL;
475 LLVMValueRef z_pass = NULL, s_pass_mask = NULL;
476 LLVMValueRef orig_mask = lp_build_mask_value(mask);
477 LLVMValueRef front_facing = NULL;
479 /* Prototype a simpler path:
481 if (z_src_type.floating &&
482 format_desc->format == PIPE_FORMAT_X8Z24_UNORM &&
485 LLVMValueRef zscaled;
486 LLVMValueRef const_ffffff_float;
487 LLVMValueRef const_8_int;
488 LLVMTypeRef int32_vec_type;
490 /* We know the values in z_dst are all >= 0, so allow
491 * lp_build_compare to use signed compare intrinsics:
498 type.length = z_src_type.length;
500 int32_vec_type = LLVMVectorType(LLVMInt32Type(), z_src_type.length);
502 const_8_int = lp_build_const_int_vec(type, 8);
503 const_ffffff_float = lp_build_const_vec(z_src_type, (float)0xffffff);
505 zscaled = LLVMBuildFMul(builder, z_src, const_ffffff_float, "zscaled");
506 z_src = LLVMBuildFPToSI(builder, zscaled, int32_vec_type, "z_src");
508 /* Load current z/stencil value from z/stencil buffer */
509 z_dst = LLVMBuildLoad(builder, zs_dst_ptr, "zsbufval");
510 z_dst = LLVMBuildLShr(builder, z_dst, const_8_int, "z_dst");
512 /* compare src Z to dst Z, returning 'pass' mask */
513 z_pass = lp_build_compare(builder,
515 depth->func, z_src, z_dst);
517 lp_build_mask_update(mask, z_pass);
520 lp_build_mask_check(mask);
522 /* No need to worry about old stencil contents, just blend the
523 * old and new values and shift into the correct position for
526 if (depth->writemask) {
528 lp_build_context_init(&bld, builder, type);
530 z_dst = lp_build_select(&bld, lp_build_mask_value(mask), z_src, z_dst);
531 z_dst = LLVMBuildShl(builder, z_dst, const_8_int, "z_dst");
539 * Depths are expected to be between 0 and 1, even if they are stored in
540 * floats. Setting these bits here will ensure that the lp_build_conv() call
541 * below won't try to unnecessarily clamp the incoming values.
543 if(z_src_type.floating) {
544 z_src_type.sign = FALSE;
545 z_src_type.norm = TRUE;
548 assert(!z_src_type.sign);
549 assert(z_src_type.norm);
552 /* Pick the depth type. */
553 type = lp_depth_type(format_desc, z_src_type.width*z_src_type.length);
555 /* FIXME: Cope with a depth test type with a different bit width. */
556 assert(type.width == z_src_type.width);
557 assert(type.length == z_src_type.length);
559 /* Convert fragment Z from float to integer */
560 lp_build_conv(builder, z_src_type, type, &z_src, 1, &z_src, 1);
562 zs_dst_ptr = LLVMBuildBitCast(builder,
564 LLVMPointerType(lp_build_vec_type(type), 0), "");
568 /* Sanity checking */
570 const unsigned z_swizzle = format_desc->swizzle[0];
571 const unsigned s_swizzle = format_desc->swizzle[1];
573 assert(z_swizzle != UTIL_FORMAT_SWIZZLE_NONE ||
574 s_swizzle != UTIL_FORMAT_SWIZZLE_NONE);
576 assert(depth->enabled || stencil[0].enabled);
578 assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS);
579 assert(format_desc->block.width == 1);
580 assert(format_desc->block.height == 1);
582 if (stencil[0].enabled) {
583 assert(format_desc->format == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||
584 format_desc->format == PIPE_FORMAT_S8_USCALED_Z24_UNORM);
587 assert(z_swizzle < 4);
588 assert(format_desc->block.bits == type.width);
590 assert(z_swizzle == 0);
591 assert(format_desc->channel[z_swizzle].type ==
592 UTIL_FORMAT_TYPE_FLOAT);
593 assert(format_desc->channel[z_swizzle].size ==
594 format_desc->block.bits);
597 assert(format_desc->channel[z_swizzle].type ==
598 UTIL_FORMAT_TYPE_UNSIGNED);
599 assert(format_desc->channel[z_swizzle].normalized);
607 /* Setup build context for Z vals */
608 lp_build_context_init(&bld, builder, type);
610 /* Setup build context for stencil vals */
611 s_type = lp_type_int_vec(type.width);
612 lp_build_context_init(&sbld, builder, s_type);
614 /* Load current z/stencil value from z/stencil buffer */
615 zs_dst = LLVMBuildLoad(builder, zs_dst_ptr, "");
617 lp_build_name(zs_dst, "zsbufval");
620 /* Compute and apply the Z/stencil bitmasks and shifts.
623 unsigned z_shift, z_mask;
624 unsigned s_shift, s_mask;
626 if (get_z_shift_and_mask(format_desc, &z_shift, &z_mask)) {
628 LLVMValueRef shift = lp_build_const_int_vec(type, z_shift);
629 z_src = LLVMBuildLShr(builder, z_src, shift, "");
632 if (z_mask != 0xffffffff) {
633 LLVMValueRef mask = lp_build_const_int_vec(type, z_mask);
634 z_src = LLVMBuildAnd(builder, z_src, mask, "");
635 z_dst = LLVMBuildAnd(builder, zs_dst, mask, "");
636 z_bitmask = mask; /* used below */
642 lp_build_name(z_dst, "zsbuf.z");
645 if (get_s_shift_and_mask(format_desc, &s_shift, &s_mask)) {
647 LLVMValueRef shift = lp_build_const_int_vec(type, s_shift);
648 stencil_vals = LLVMBuildLShr(builder, zs_dst, shift, "");
649 stencil_shift = shift; /* used below */
652 stencil_vals = zs_dst;
655 if (s_mask != 0xffffffff) {
656 LLVMValueRef mask = lp_build_const_int_vec(type, s_mask);
657 stencil_vals = LLVMBuildAnd(builder, stencil_vals, mask, "");
660 lp_build_name(stencil_vals, "stencil");
664 if (stencil[0].enabled) {
667 LLVMValueRef zero = LLVMConstReal(LLVMFloatType(), 0.0);
669 /* front_facing = face > 0.0 ? ~0 : 0 */
670 front_facing = LLVMBuildFCmp(builder, LLVMRealUGT, face, zero, "");
671 front_facing = LLVMBuildSExt(builder, front_facing,
672 LLVMIntType(bld.type.length*bld.type.width),
674 front_facing = LLVMBuildBitCast(builder, front_facing,
675 bld.int_vec_type, "");
678 /* convert scalar stencil refs into vectors */
679 stencil_refs[0] = lp_build_broadcast_scalar(&bld, stencil_refs[0]);
680 stencil_refs[1] = lp_build_broadcast_scalar(&bld, stencil_refs[1]);
682 s_pass_mask = lp_build_stencil_test(&sbld, stencil,
683 stencil_refs, stencil_vals,
686 /* apply stencil-fail operator */
688 LLVMValueRef s_fail_mask = lp_build_andnot(&bld, orig_mask, s_pass_mask);
689 stencil_vals = lp_build_stencil_op(&sbld, stencil, S_FAIL_OP,
690 stencil_refs, stencil_vals,
691 s_fail_mask, front_facing);
695 if (depth->enabled) {
696 /* compare src Z to dst Z, returning 'pass' mask */
697 z_pass = lp_build_cmp(&bld, depth->func, z_src, z_dst);
699 if (!stencil[0].enabled) {
700 /* We can potentially skip all remaining operations here, but only
701 * if stencil is disabled because we still need to update the stencil
702 * buffer values. Don't need to update Z buffer values.
704 lp_build_mask_update(mask, z_pass);
707 lp_build_mask_check(mask);
712 if (depth->writemask) {
713 LLVMValueRef zselectmask = lp_build_mask_value(mask);
715 /* mask off bits that failed Z test */
716 zselectmask = LLVMBuildAnd(builder, zselectmask, z_pass, "");
718 /* mask off bits that failed stencil test */
720 zselectmask = LLVMBuildAnd(builder, zselectmask, s_pass_mask, "");
723 /* if combined Z/stencil format, mask off the stencil bits */
725 zselectmask = LLVMBuildAnd(builder, zselectmask, z_bitmask, "");
728 /* Mix the old and new Z buffer values.
729 * z_dst[i] = (zselectmask[i] & z_src[i]) | (~zselectmask[i] & z_dst[i])
731 z_dst = lp_build_select_bitwise(&bld, zselectmask, z_src, z_dst);
734 if (stencil[0].enabled) {
735 /* update stencil buffer values according to z pass/fail result */
736 LLVMValueRef z_fail_mask, z_pass_mask;
738 /* apply Z-fail operator */
739 z_fail_mask = lp_build_andnot(&bld, orig_mask, z_pass);
740 stencil_vals = lp_build_stencil_op(&sbld, stencil, Z_FAIL_OP,
741 stencil_refs, stencil_vals,
742 z_fail_mask, front_facing);
744 /* apply Z-pass operator */
745 z_pass_mask = LLVMBuildAnd(bld.builder, orig_mask, z_pass, "");
746 stencil_vals = lp_build_stencil_op(&sbld, stencil, Z_PASS_OP,
747 stencil_refs, stencil_vals,
748 z_pass_mask, front_facing);
752 /* No depth test: apply Z-pass operator to stencil buffer values which
753 * passed the stencil test.
755 s_pass_mask = LLVMBuildAnd(bld.builder, orig_mask, s_pass_mask, "");
756 stencil_vals = lp_build_stencil_op(&sbld, stencil, Z_PASS_OP,
757 stencil_refs, stencil_vals,
758 s_pass_mask, front_facing);
761 /* The Z bits are already in the right place but we may need to shift the
762 * stencil bits before ORing Z with Stencil to make the final pixel value.
764 if (stencil_vals && stencil_shift)
765 stencil_vals = LLVMBuildShl(bld.builder, stencil_vals,
768 /* Finally, merge/store the z/stencil values */
769 if ((depth->enabled && depth->writemask) ||
770 (stencil[0].enabled && stencil[0].writemask)) {
772 if (z_dst && stencil_vals)
773 zs_dst = LLVMBuildOr(bld.builder, z_dst, stencil_vals, "");
777 zs_dst = stencil_vals;
783 lp_build_mask_update(mask, s_pass_mask);
785 if (depth->enabled && stencil[0].enabled)
786 lp_build_mask_update(mask, z_pass);
789 lp_build_mask_check(mask);
796 lp_build_deferred_depth_write(LLVMBuilderRef builder,
797 struct lp_type z_src_type,
798 const struct util_format_description *format_desc,
799 struct lp_build_mask_context *mask,
800 LLVMValueRef zs_dst_ptr,
801 LLVMValueRef zs_value)
804 struct lp_build_context bld;
807 /* XXX: pointlessly redo type logic:
809 type = lp_depth_type(format_desc, z_src_type.width*z_src_type.length);
810 lp_build_context_init(&bld, builder, type);
812 z_dst = LLVMBuildLoad(builder, zs_dst_ptr, "zsbufval");
813 z_dst = lp_build_select(&bld, lp_build_mask_value(mask), zs_value, z_dst);
815 LLVMBuildStore(builder, z_dst, zs_dst_ptr);