1 /**************************************************************************
3 * Copyright 2009-2010 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 * ... ... ... ... ... ... ... ... ...
56 * @author Jose Fonseca <jfonseca@vmware.com>
57 * @author Brian Paul <jfonseca@vmware.com>
60 #include "pipe/p_state.h"
61 #include "util/u_format.h"
63 #include "gallivm/lp_bld_type.h"
64 #include "gallivm/lp_bld_arit.h"
65 #include "gallivm/lp_bld_bitarit.h"
66 #include "gallivm/lp_bld_const.h"
67 #include "gallivm/lp_bld_conv.h"
68 #include "gallivm/lp_bld_logic.h"
69 #include "gallivm/lp_bld_flow.h"
70 #include "gallivm/lp_bld_intr.h"
71 #include "gallivm/lp_bld_debug.h"
72 #include "gallivm/lp_bld_swizzle.h"
74 #include "lp_bld_depth.h"
77 /** Used to select fields from pipe_stencil_state */
87 * Do the stencil test comparison (compare FB stencil values against ref value).
88 * This will be used twice when generating two-sided stencil code.
89 * \param stencil the front/back stencil state
90 * \param stencilRef the stencil reference value, replicated as a vector
91 * \param stencilVals vector of stencil values from framebuffer
92 * \return vector mask of pass/fail values (~0 or 0)
95 lp_build_stencil_test_single(struct lp_build_context
*bld
,
96 const struct pipe_stencil_state
*stencil
,
97 LLVMValueRef stencilRef
,
98 LLVMValueRef stencilVals
)
100 const unsigned stencilMax
= 255; /* XXX fix */
101 struct lp_type type
= bld
->type
;
106 assert(stencil
->enabled
);
108 if (stencil
->valuemask
!= stencilMax
) {
109 /* compute stencilRef = stencilRef & valuemask */
110 LLVMValueRef valuemask
= lp_build_const_int_vec(type
, stencil
->valuemask
);
111 stencilRef
= LLVMBuildAnd(bld
->builder
, stencilRef
, valuemask
, "");
112 /* compute stencilVals = stencilVals & valuemask */
113 stencilVals
= LLVMBuildAnd(bld
->builder
, stencilVals
, valuemask
, "");
116 res
= lp_build_cmp(bld
, stencil
->func
, stencilRef
, stencilVals
);
123 * Do the one or two-sided stencil test comparison.
124 * \sa lp_build_stencil_test_single
125 * \param front_facing an integer vector mask, indicating front (~0) or back
126 * (0) facing polygon. If NULL, assume front-facing.
129 lp_build_stencil_test(struct lp_build_context
*bld
,
130 const struct pipe_stencil_state stencil
[2],
131 LLVMValueRef stencilRefs
[2],
132 LLVMValueRef stencilVals
,
133 LLVMValueRef front_facing
)
137 assert(stencil
[0].enabled
);
139 /* do front face test */
140 res
= lp_build_stencil_test_single(bld
, &stencil
[0],
141 stencilRefs
[0], stencilVals
);
143 if (stencil
[1].enabled
&& front_facing
) {
144 /* do back face test */
145 LLVMValueRef back_res
;
147 back_res
= lp_build_stencil_test_single(bld
, &stencil
[1],
148 stencilRefs
[1], stencilVals
);
150 res
= lp_build_select(bld
, front_facing
, res
, back_res
);
158 * Apply the stencil operator (add/sub/keep/etc) to the given vector
160 * \return new stencil values vector
163 lp_build_stencil_op_single(struct lp_build_context
*bld
,
164 const struct pipe_stencil_state
*stencil
,
166 LLVMValueRef stencilRef
,
167 LLVMValueRef stencilVals
)
170 struct lp_type type
= bld
->type
;
172 LLVMValueRef max
= lp_build_const_int_vec(type
, 0xff);
179 stencil_op
= stencil
->fail_op
;
182 stencil_op
= stencil
->zfail_op
;
185 stencil_op
= stencil
->zpass_op
;
188 assert(0 && "Invalid stencil_op mode");
189 stencil_op
= PIPE_STENCIL_OP_KEEP
;
192 switch (stencil_op
) {
193 case PIPE_STENCIL_OP_KEEP
:
195 /* we can return early for this case */
197 case PIPE_STENCIL_OP_ZERO
:
200 case PIPE_STENCIL_OP_REPLACE
:
203 case PIPE_STENCIL_OP_INCR
:
204 res
= lp_build_add(bld
, stencilVals
, bld
->one
);
205 res
= lp_build_min(bld
, res
, max
);
207 case PIPE_STENCIL_OP_DECR
:
208 res
= lp_build_sub(bld
, stencilVals
, bld
->one
);
209 res
= lp_build_max(bld
, res
, bld
->zero
);
211 case PIPE_STENCIL_OP_INCR_WRAP
:
212 res
= lp_build_add(bld
, stencilVals
, bld
->one
);
213 res
= LLVMBuildAnd(bld
->builder
, res
, max
, "");
215 case PIPE_STENCIL_OP_DECR_WRAP
:
216 res
= lp_build_sub(bld
, stencilVals
, bld
->one
);
217 res
= LLVMBuildAnd(bld
->builder
, res
, max
, "");
219 case PIPE_STENCIL_OP_INVERT
:
220 res
= LLVMBuildNot(bld
->builder
, stencilVals
, "");
221 res
= LLVMBuildAnd(bld
->builder
, res
, max
, "");
224 assert(0 && "bad stencil op mode");
233 * Do the one or two-sided stencil test op/update.
236 lp_build_stencil_op(struct lp_build_context
*bld
,
237 const struct pipe_stencil_state stencil
[2],
239 LLVMValueRef stencilRefs
[2],
240 LLVMValueRef stencilVals
,
242 LLVMValueRef front_facing
)
247 assert(stencil
[0].enabled
);
249 /* do front face op */
250 res
= lp_build_stencil_op_single(bld
, &stencil
[0], op
,
251 stencilRefs
[0], stencilVals
);
253 if (stencil
[1].enabled
&& front_facing
) {
254 /* do back face op */
255 LLVMValueRef back_res
;
257 back_res
= lp_build_stencil_op_single(bld
, &stencil
[1], op
,
258 stencilRefs
[1], stencilVals
);
260 res
= lp_build_select(bld
, front_facing
, res
, back_res
);
263 if (stencil
->writemask
!= 0xff) {
264 /* mask &= stencil->writemask */
265 LLVMValueRef writemask
= lp_build_const_int_vec(bld
->type
, stencil
->writemask
);
266 mask
= LLVMBuildAnd(bld
->builder
, mask
, writemask
, "");
267 /* res = (res & mask) | (stencilVals & ~mask) */
268 res
= lp_build_select_bitwise(bld
, writemask
, res
, stencilVals
);
271 /* res = mask ? res : stencilVals */
272 res
= lp_build_select(bld
, mask
, res
, stencilVals
);
281 * Return a type appropriate for depth/stencil testing.
284 lp_depth_type(const struct util_format_description
*format_desc
,
290 assert(format_desc
->colorspace
== UTIL_FORMAT_COLORSPACE_ZS
);
291 assert(format_desc
->block
.width
== 1);
292 assert(format_desc
->block
.height
== 1);
294 swizzle
= format_desc
->swizzle
[0];
297 memset(&type
, 0, sizeof type
);
298 type
.width
= format_desc
->block
.bits
;
300 if(format_desc
->channel
[swizzle
].type
== UTIL_FORMAT_TYPE_FLOAT
) {
301 type
.floating
= TRUE
;
302 assert(swizzle
== 0);
303 assert(format_desc
->channel
[swizzle
].size
== format_desc
->block
.bits
);
305 else if(format_desc
->channel
[swizzle
].type
== UTIL_FORMAT_TYPE_UNSIGNED
) {
306 assert(format_desc
->block
.bits
<= 32);
307 assert(format_desc
->channel
[swizzle
].normalized
);
308 if (format_desc
->channel
[swizzle
].size
< format_desc
->block
.bits
) {
309 /* Prefer signed integers when possible, as SSE has less support
310 * for unsigned comparison;
318 assert(type
.width
<= length
);
319 type
.length
= length
/ type
.width
;
326 * Compute bitmask and bit shift to apply to the incoming fragment Z values
327 * and the Z buffer values needed before doing the Z comparison.
329 * Note that we leave the Z bits in the position that we find them
330 * in the Z buffer (typically 0xffffff00 or 0x00ffffff). That lets us
331 * get by with fewer bit twiddling steps.
334 get_z_shift_and_mask(const struct util_format_description
*format_desc
,
335 unsigned *shift
, unsigned *width
, unsigned *mask
)
337 const unsigned total_bits
= format_desc
->block
.bits
;
340 unsigned padding_left
, padding_right
;
342 assert(format_desc
->colorspace
== UTIL_FORMAT_COLORSPACE_ZS
);
343 assert(format_desc
->block
.width
== 1);
344 assert(format_desc
->block
.height
== 1);
346 z_swizzle
= format_desc
->swizzle
[0];
348 assert(z_swizzle
!= UTIL_FORMAT_SWIZZLE_NONE
);
350 *width
= format_desc
->channel
[z_swizzle
].size
;
353 for (chan
= 0; chan
< z_swizzle
; ++chan
)
354 padding_right
+= format_desc
->channel
[chan
].size
;
357 total_bits
- (padding_right
+ *width
);
359 if (padding_left
|| padding_right
) {
360 unsigned long long mask_left
= (1ULL << (total_bits
- padding_left
)) - 1;
361 unsigned long long mask_right
= (1ULL << (padding_right
)) - 1;
362 *mask
= mask_left
^ mask_right
;
368 *shift
= padding_right
;
373 * Compute bitmask and bit shift to apply to the framebuffer pixel values
374 * to put the stencil bits in the least significant position.
378 get_s_shift_and_mask(const struct util_format_description
*format_desc
,
379 unsigned *shift
, unsigned *mask
)
384 s_swizzle
= format_desc
->swizzle
[1];
386 if (s_swizzle
== UTIL_FORMAT_SWIZZLE_NONE
)
390 for (chan
= 0; chan
< s_swizzle
; chan
++)
391 *shift
+= format_desc
->channel
[chan
].size
;
393 sz
= format_desc
->channel
[s_swizzle
].size
;
394 *mask
= (1U << sz
) - 1U;
401 * Perform the occlusion test and increase the counter.
402 * Test the depth mask. Add the number of channel which has none zero mask
403 * into the occlusion counter. e.g. maskvalue is {-1, -1, -1, -1}.
404 * The counter will add 4.
406 * \param type holds element type of the mask vector.
407 * \param maskvalue is the depth test mask.
408 * \param counter is a pointer of the uint32 counter.
411 lp_build_occlusion_count(LLVMBuilderRef builder
,
413 LLVMValueRef maskvalue
,
414 LLVMValueRef counter
)
416 LLVMValueRef countmask
= lp_build_const_int_vec(type
, 1);
417 LLVMValueRef countv
= LLVMBuildAnd(builder
, maskvalue
, countmask
, "countv");
418 LLVMTypeRef i8v16
= LLVMVectorType(LLVMInt8Type(), 16);
419 LLVMValueRef counti
= LLVMBuildBitCast(builder
, countv
, i8v16
, "counti");
420 LLVMValueRef maskarray
[4] = {
421 LLVMConstInt(LLVMInt32Type(), 0, 0),
422 LLVMConstInt(LLVMInt32Type(), 4, 0),
423 LLVMConstInt(LLVMInt32Type(), 8, 0),
424 LLVMConstInt(LLVMInt32Type(), 12, 0),
426 LLVMValueRef shufflemask
= LLVMConstVector(maskarray
, 4);
427 LLVMValueRef shufflev
= LLVMBuildShuffleVector(builder
, counti
, LLVMGetUndef(i8v16
), shufflemask
, "shufflev");
428 LLVMValueRef shuffle
= LLVMBuildBitCast(builder
, shufflev
, LLVMInt32Type(), "shuffle");
429 LLVMValueRef count
= lp_build_intrinsic_unary(builder
, "llvm.ctpop.i32", LLVMInt32Type(), shuffle
);
430 LLVMValueRef orig
= LLVMBuildLoad(builder
, counter
, "orig");
431 LLVMValueRef incr
= LLVMBuildAdd(builder
, orig
, count
, "incr");
432 LLVMBuildStore(builder
, incr
, counter
);
438 * Generate code for performing depth and/or stencil tests.
439 * We operate on a vector of values (typically a 2x2 quad).
441 * \param depth the depth test state
442 * \param stencil the front/back stencil state
443 * \param type the data type of the fragment depth/stencil values
444 * \param format_desc description of the depth/stencil surface
445 * \param mask the alive/dead pixel mask for the quad (vector)
446 * \param stencil_refs the front/back stencil ref values (scalar)
447 * \param z_src the incoming depth/stencil values (a 2x2 quad, float32)
448 * \param zs_dst_ptr pointer to depth/stencil values in framebuffer
449 * \param facing contains float value indicating front/back facing polygon
452 lp_build_depth_stencil_test(LLVMBuilderRef builder
,
453 const struct pipe_depth_state
*depth
,
454 const struct pipe_stencil_state stencil
[2],
455 struct lp_type z_src_type
,
456 const struct util_format_description
*format_desc
,
457 struct lp_build_mask_context
*mask
,
458 LLVMValueRef stencil_refs
[2],
460 LLVMValueRef zs_dst_ptr
,
462 LLVMValueRef
*zs_value
,
465 struct lp_type z_type
;
466 struct lp_build_context z_bld
;
467 struct lp_build_context s_bld
;
468 struct lp_type s_type
;
469 unsigned z_shift
, z_width
, z_mask
;
470 LLVMValueRef zs_dst
, z_dst
= NULL
;
471 LLVMValueRef stencil_vals
= NULL
;
472 LLVMValueRef z_bitmask
= NULL
, stencil_shift
= NULL
;
473 LLVMValueRef z_pass
= NULL
, s_pass_mask
= NULL
;
474 LLVMValueRef orig_mask
= lp_build_mask_value(mask
);
475 LLVMValueRef front_facing
= NULL
;
479 * Depths are expected to be between 0 and 1, even if they are stored in
480 * floats. Setting these bits here will ensure that the lp_build_conv() call
481 * below won't try to unnecessarily clamp the incoming values.
483 if(z_src_type
.floating
) {
484 z_src_type
.sign
= FALSE
;
485 z_src_type
.norm
= TRUE
;
488 assert(!z_src_type
.sign
);
489 assert(z_src_type
.norm
);
492 /* Pick the depth type. */
493 z_type
= lp_depth_type(format_desc
, z_src_type
.width
*z_src_type
.length
);
495 /* FIXME: Cope with a depth test type with a different bit width. */
496 assert(z_type
.width
== z_src_type
.width
);
497 assert(z_type
.length
== z_src_type
.length
);
499 /* Sanity checking */
501 const unsigned z_swizzle
= format_desc
->swizzle
[0];
502 const unsigned s_swizzle
= format_desc
->swizzle
[1];
504 assert(z_swizzle
!= UTIL_FORMAT_SWIZZLE_NONE
||
505 s_swizzle
!= UTIL_FORMAT_SWIZZLE_NONE
);
507 assert(depth
->enabled
|| stencil
[0].enabled
);
509 assert(format_desc
->colorspace
== UTIL_FORMAT_COLORSPACE_ZS
);
510 assert(format_desc
->block
.width
== 1);
511 assert(format_desc
->block
.height
== 1);
513 if (stencil
[0].enabled
) {
514 assert(format_desc
->format
== PIPE_FORMAT_Z24_UNORM_S8_USCALED
||
515 format_desc
->format
== PIPE_FORMAT_S8_USCALED_Z24_UNORM
);
518 assert(z_swizzle
< 4);
519 assert(format_desc
->block
.bits
== z_type
.width
);
520 if (z_type
.floating
) {
521 assert(z_swizzle
== 0);
522 assert(format_desc
->channel
[z_swizzle
].type
==
523 UTIL_FORMAT_TYPE_FLOAT
);
524 assert(format_desc
->channel
[z_swizzle
].size
==
525 format_desc
->block
.bits
);
528 assert(format_desc
->channel
[z_swizzle
].type
==
529 UTIL_FORMAT_TYPE_UNSIGNED
);
530 assert(format_desc
->channel
[z_swizzle
].normalized
);
531 assert(!z_type
.fixed
);
536 /* Setup build context for Z vals */
537 lp_build_context_init(&z_bld
, builder
, z_type
);
539 /* Setup build context for stencil vals */
540 s_type
= lp_type_int_vec(z_type
.width
);
541 lp_build_context_init(&s_bld
, builder
, s_type
);
543 /* Load current z/stencil value from z/stencil buffer */
544 zs_dst_ptr
= LLVMBuildBitCast(builder
,
546 LLVMPointerType(z_bld
.vec_type
, 0), "");
547 zs_dst
= LLVMBuildLoad(builder
, zs_dst_ptr
, "");
549 lp_build_name(zs_dst
, "zs_dst");
552 /* Compute and apply the Z/stencil bitmasks and shifts.
555 unsigned s_shift
, s_mask
;
557 if (get_s_shift_and_mask(format_desc
, &s_shift
, &s_mask
)) {
559 LLVMValueRef shift
= lp_build_const_int_vec(s_type
, s_shift
);
560 stencil_vals
= LLVMBuildLShr(builder
, zs_dst
, shift
, "");
561 stencil_shift
= shift
; /* used below */
564 stencil_vals
= zs_dst
;
567 if (s_mask
!= 0xffffffff) {
568 LLVMValueRef mask
= lp_build_const_int_vec(s_type
, s_mask
);
569 stencil_vals
= LLVMBuildAnd(builder
, stencil_vals
, mask
, "");
572 lp_build_name(stencil_vals
, "s_dst");
576 if (stencil
[0].enabled
) {
579 LLVMValueRef zero
= LLVMConstReal(LLVMFloatType(), 0.0);
581 /* front_facing = face > 0.0 ? ~0 : 0 */
582 front_facing
= LLVMBuildFCmp(builder
, LLVMRealUGT
, face
, zero
, "");
583 front_facing
= LLVMBuildSExt(builder
, front_facing
,
584 LLVMIntType(s_bld
.type
.length
*s_bld
.type
.width
),
586 front_facing
= LLVMBuildBitCast(builder
, front_facing
,
587 s_bld
.int_vec_type
, "");
590 /* convert scalar stencil refs into vectors */
591 stencil_refs
[0] = lp_build_broadcast_scalar(&s_bld
, stencil_refs
[0]);
592 stencil_refs
[1] = lp_build_broadcast_scalar(&s_bld
, stencil_refs
[1]);
594 s_pass_mask
= lp_build_stencil_test(&s_bld
, stencil
,
595 stencil_refs
, stencil_vals
,
598 /* apply stencil-fail operator */
600 LLVMValueRef s_fail_mask
= lp_build_andnot(&s_bld
, orig_mask
, s_pass_mask
);
601 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, S_FAIL_OP
,
602 stencil_refs
, stencil_vals
,
603 s_fail_mask
, front_facing
);
607 if (depth
->enabled
) {
608 get_z_shift_and_mask(format_desc
, &z_shift
, &z_width
, &z_mask
);
611 * Convert fragment Z to the desired type, aligning the LSB to the right.
614 assert(z_type
.width
== z_src_type
.width
);
615 assert(z_type
.length
== z_src_type
.length
);
616 assert(lp_check_value(z_src_type
, z_src
));
617 if (z_src_type
.floating
) {
619 * Convert from floating point values
622 if (!z_type
.floating
) {
623 z_src
= lp_build_clamped_float_to_unsigned_norm(builder
,
630 * Convert from unsigned normalized values.
633 assert(!z_src_type
.sign
);
634 assert(!z_src_type
.fixed
);
635 assert(z_src_type
.norm
);
636 assert(!z_type
.floating
);
637 if (z_src_type
.width
> z_width
) {
638 LLVMValueRef shift
= lp_build_const_int_vec(z_src_type
,
639 z_src_type
.width
- z_width
);
640 z_src
= LLVMBuildLShr(builder
, z_src
, shift
, "");
643 assert(lp_check_value(z_type
, z_src
));
645 lp_build_name(z_src
, "z_src");
647 if (z_mask
!= 0xffffffff) {
648 z_bitmask
= lp_build_const_int_vec(z_type
, z_mask
);
652 * Align the framebuffer Z 's LSB to the right.
655 LLVMValueRef shift
= lp_build_const_int_vec(z_type
, z_shift
);
656 z_dst
= LLVMBuildLShr(builder
, zs_dst
, shift
, "z_dst");
657 } else if (z_bitmask
) {
658 z_dst
= LLVMBuildAnd(builder
, zs_dst
, z_bitmask
, "z_dst");
661 lp_build_name(z_dst
, "z_dst");
664 /* compare src Z to dst Z, returning 'pass' mask */
665 z_pass
= lp_build_cmp(&z_bld
, depth
->func
, z_src
, z_dst
);
667 if (!stencil
[0].enabled
) {
668 /* We can potentially skip all remaining operations here, but only
669 * if stencil is disabled because we still need to update the stencil
670 * buffer values. Don't need to update Z buffer values.
672 lp_build_mask_update(mask
, z_pass
);
675 lp_build_mask_check(mask
);
680 if (depth
->writemask
) {
681 LLVMValueRef zselectmask
;
683 /* mask off bits that failed Z test */
684 zselectmask
= LLVMBuildAnd(builder
, orig_mask
, z_pass
, "");
686 /* mask off bits that failed stencil test */
688 zselectmask
= LLVMBuildAnd(builder
, zselectmask
, s_pass_mask
, "");
691 /* Mix the old and new Z buffer values.
692 * z_dst[i] = zselectmask[i] ? z_src[i] : z_dst[i]
694 z_dst
= lp_build_select(&z_bld
, zselectmask
, z_src
, z_dst
);
697 if (stencil
[0].enabled
) {
698 /* update stencil buffer values according to z pass/fail result */
699 LLVMValueRef z_fail_mask
, z_pass_mask
;
701 /* apply Z-fail operator */
702 z_fail_mask
= lp_build_andnot(&z_bld
, orig_mask
, z_pass
);
703 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, Z_FAIL_OP
,
704 stencil_refs
, stencil_vals
,
705 z_fail_mask
, front_facing
);
707 /* apply Z-pass operator */
708 z_pass_mask
= LLVMBuildAnd(z_bld
.builder
, orig_mask
, z_pass
, "");
709 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, Z_PASS_OP
,
710 stencil_refs
, stencil_vals
,
711 z_pass_mask
, front_facing
);
715 /* No depth test: apply Z-pass operator to stencil buffer values which
716 * passed the stencil test.
718 s_pass_mask
= LLVMBuildAnd(s_bld
.builder
, orig_mask
, s_pass_mask
, "");
719 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, Z_PASS_OP
,
720 stencil_refs
, stencil_vals
,
721 s_pass_mask
, front_facing
);
724 /* Put Z and ztencil bits in the right place */
725 if (z_dst
&& z_shift
) {
726 LLVMValueRef shift
= lp_build_const_int_vec(z_type
, z_shift
);
727 z_dst
= LLVMBuildShl(builder
, z_dst
, shift
, "");
729 if (stencil_vals
&& stencil_shift
)
730 stencil_vals
= LLVMBuildShl(s_bld
.builder
, stencil_vals
,
733 /* Finally, merge/store the z/stencil values */
734 if ((depth
->enabled
&& depth
->writemask
) ||
735 (stencil
[0].enabled
&& stencil
[0].writemask
)) {
737 if (z_dst
&& stencil_vals
)
738 zs_dst
= LLVMBuildOr(z_bld
.builder
, z_dst
, stencil_vals
, "");
742 zs_dst
= stencil_vals
;
748 lp_build_mask_update(mask
, s_pass_mask
);
750 if (depth
->enabled
&& stencil
[0].enabled
)
751 lp_build_mask_update(mask
, z_pass
);
754 lp_build_mask_check(mask
);
760 lp_build_depth_write(LLVMBuilderRef builder
,
761 const struct util_format_description
*format_desc
,
762 LLVMValueRef zs_dst_ptr
,
763 LLVMValueRef zs_value
)
765 zs_dst_ptr
= LLVMBuildBitCast(builder
, zs_dst_ptr
,
766 LLVMPointerType(LLVMTypeOf(zs_value
), 0), "");
768 LLVMBuildStore(builder
, zs_value
, zs_dst_ptr
);
773 lp_build_deferred_depth_write(LLVMBuilderRef builder
,
774 struct lp_type z_src_type
,
775 const struct util_format_description
*format_desc
,
776 struct lp_build_mask_context
*mask
,
777 LLVMValueRef zs_dst_ptr
,
778 LLVMValueRef zs_value
)
780 struct lp_type z_type
;
781 struct lp_build_context z_bld
;
784 /* XXX: pointlessly redo type logic:
786 z_type
= lp_depth_type(format_desc
, z_src_type
.width
*z_src_type
.length
);
787 lp_build_context_init(&z_bld
, builder
, z_type
);
789 zs_dst_ptr
= LLVMBuildBitCast(builder
, zs_dst_ptr
,
790 LLVMPointerType(z_bld
.vec_type
, 0), "");
792 z_dst
= LLVMBuildLoad(builder
, zs_dst_ptr
, "zsbufval");
793 z_dst
= lp_build_select(&z_bld
, lp_build_mask_value(mask
), zs_value
, z_dst
);
795 LLVMBuildStore(builder
, z_dst
, zs_dst_ptr
);