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 if(format_desc
->channel
[swizzle
].normalized
)
313 assert(type
.width
<= length
);
314 type
.length
= length
/ type
.width
;
321 * Compute bitmask and bit shift to apply to the incoming fragment Z values
322 * and the Z buffer values needed before doing the Z comparison.
324 * Note that we leave the Z bits in the position that we find them
325 * in the Z buffer (typically 0xffffff00 or 0x00ffffff). That lets us
326 * get by with fewer bit twiddling steps.
329 get_z_shift_and_mask(const struct util_format_description
*format_desc
,
330 unsigned *shift
, unsigned *mask
)
332 const unsigned total_bits
= format_desc
->block
.bits
;
335 unsigned padding_left
, padding_right
;
337 assert(format_desc
->colorspace
== UTIL_FORMAT_COLORSPACE_ZS
);
338 assert(format_desc
->block
.width
== 1);
339 assert(format_desc
->block
.height
== 1);
341 z_swizzle
= format_desc
->swizzle
[0];
343 if (z_swizzle
== UTIL_FORMAT_SWIZZLE_NONE
)
347 for (chan
= 0; chan
< z_swizzle
; ++chan
)
348 padding_right
+= format_desc
->channel
[chan
].size
;
351 total_bits
- (padding_right
+ format_desc
->channel
[z_swizzle
].size
);
353 if (padding_left
|| padding_right
) {
354 unsigned long long mask_left
= (1ULL << (total_bits
- padding_left
)) - 1;
355 unsigned long long mask_right
= (1ULL << (padding_right
)) - 1;
356 *mask
= mask_left
^ mask_right
;
362 *shift
= padding_left
;
369 * Compute bitmask and bit shift to apply to the framebuffer pixel values
370 * to put the stencil bits in the least significant position.
374 get_s_shift_and_mask(const struct util_format_description
*format_desc
,
375 unsigned *shift
, unsigned *mask
)
380 s_swizzle
= format_desc
->swizzle
[1];
382 if (s_swizzle
== UTIL_FORMAT_SWIZZLE_NONE
)
386 for (chan
= 0; chan
< s_swizzle
; chan
++)
387 *shift
+= format_desc
->channel
[chan
].size
;
389 sz
= format_desc
->channel
[s_swizzle
].size
;
390 *mask
= (1U << sz
) - 1U;
397 * Perform the occlusion test and increase the counter.
398 * Test the depth mask. Add the number of channel which has none zero mask
399 * into the occlusion counter. e.g. maskvalue is {-1, -1, -1, -1}.
400 * The counter will add 4.
402 * \param type holds element type of the mask vector.
403 * \param maskvalue is the depth test mask.
404 * \param counter is a pointer of the uint32 counter.
407 lp_build_occlusion_count(LLVMBuilderRef builder
,
409 LLVMValueRef maskvalue
,
410 LLVMValueRef counter
)
412 LLVMValueRef countmask
= lp_build_const_int_vec(type
, 1);
413 LLVMValueRef countv
= LLVMBuildAnd(builder
, maskvalue
, countmask
, "countv");
414 LLVMTypeRef i8v16
= LLVMVectorType(LLVMInt8Type(), 16);
415 LLVMValueRef counti
= LLVMBuildBitCast(builder
, countv
, i8v16
, "counti");
416 LLVMValueRef maskarray
[4] = {
417 LLVMConstInt(LLVMInt32Type(), 0, 0),
418 LLVMConstInt(LLVMInt32Type(), 4, 0),
419 LLVMConstInt(LLVMInt32Type(), 8, 0),
420 LLVMConstInt(LLVMInt32Type(), 12, 0),
422 LLVMValueRef shufflemask
= LLVMConstVector(maskarray
, 4);
423 LLVMValueRef shufflev
= LLVMBuildShuffleVector(builder
, counti
, LLVMGetUndef(i8v16
), shufflemask
, "shufflev");
424 LLVMValueRef shuffle
= LLVMBuildBitCast(builder
, shufflev
, LLVMInt32Type(), "shuffle");
425 LLVMValueRef count
= lp_build_intrinsic_unary(builder
, "llvm.ctpop.i32", LLVMInt32Type(), shuffle
);
426 LLVMValueRef orig
= LLVMBuildLoad(builder
, counter
, "orig");
427 LLVMValueRef incr
= LLVMBuildAdd(builder
, orig
, count
, "incr");
428 LLVMBuildStore(builder
, incr
, counter
);
434 * Generate code for performing depth and/or stencil tests.
435 * We operate on a vector of values (typically a 2x2 quad).
437 * \param depth the depth test state
438 * \param stencil the front/back stencil state
439 * \param type the data type of the fragment depth/stencil values
440 * \param format_desc description of the depth/stencil surface
441 * \param mask the alive/dead pixel mask for the quad (vector)
442 * \param stencil_refs the front/back stencil ref values (scalar)
443 * \param z_src the incoming depth/stencil values (a 2x2 quad, float32)
444 * \param zs_dst_ptr pointer to depth/stencil values in framebuffer
445 * \param facing contains float value indicating front/back facing polygon
448 lp_build_depth_stencil_test(LLVMBuilderRef builder
,
449 const struct pipe_depth_state
*depth
,
450 const struct pipe_stencil_state stencil
[2],
451 struct lp_type z_src_type
,
452 const struct util_format_description
*format_desc
,
453 struct lp_build_mask_context
*mask
,
454 LLVMValueRef stencil_refs
[2],
456 LLVMValueRef zs_dst_ptr
,
458 LLVMValueRef
*zs_value
,
461 struct lp_type z_type
;
462 struct lp_build_context z_bld
;
463 struct lp_build_context s_bld
;
464 struct lp_type s_type
;
465 LLVMValueRef zs_dst
, z_dst
= NULL
;
466 LLVMValueRef stencil_vals
= NULL
;
467 LLVMValueRef z_bitmask
= NULL
, stencil_shift
= NULL
;
468 LLVMValueRef z_pass
= NULL
, s_pass_mask
= NULL
;
469 LLVMValueRef orig_mask
= lp_build_mask_value(mask
);
470 LLVMValueRef front_facing
= NULL
;
472 /* Prototype a simpler path:
474 if (z_src_type
.floating
&&
475 format_desc
->format
== PIPE_FORMAT_X8Z24_UNORM
&&
478 LLVMValueRef zscaled
;
479 LLVMValueRef const_ffffff_float
;
480 LLVMValueRef const_8_int
;
481 LLVMTypeRef int32_vec_type
;
483 /* We know the values in z_dst are all >= 0, so allow
484 * lp_build_compare to use signed compare intrinsics:
491 z_type
.length
= z_src_type
.length
;
493 int32_vec_type
= LLVMVectorType(LLVMInt32Type(), z_src_type
.length
);
495 const_8_int
= lp_build_const_int_vec(z_type
, 8);
496 const_ffffff_float
= lp_build_const_vec(z_src_type
, (float)0xffffff);
498 zscaled
= LLVMBuildFMul(builder
, z_src
, const_ffffff_float
, "zscaled");
499 z_src
= LLVMBuildFPToSI(builder
, zscaled
, int32_vec_type
, "z_src");
501 /* Load current z/stencil value from z/stencil buffer */
502 zs_dst_ptr
= LLVMBuildBitCast(builder
,
504 LLVMPointerType(int32_vec_type
, 0), "");
505 z_dst
= LLVMBuildLoad(builder
, zs_dst_ptr
, "zsbufval");
506 z_dst
= LLVMBuildLShr(builder
, z_dst
, const_8_int
, "z_dst");
508 /* compare src Z to dst Z, returning 'pass' mask */
509 z_pass
= lp_build_compare(builder
,
511 depth
->func
, z_src
, z_dst
);
513 lp_build_mask_update(mask
, z_pass
);
516 lp_build_mask_check(mask
);
518 /* No need to worry about old stencil contents, just blend the
519 * old and new values and shift into the correct position for
522 if (depth
->writemask
) {
524 lp_build_context_init(&z_bld
, builder
, z_type
);
526 z_dst
= lp_build_select(&z_bld
, lp_build_mask_value(mask
), z_src
, z_dst
);
527 z_dst
= LLVMBuildShl(builder
, z_dst
, const_8_int
, "z_dst");
535 * Depths are expected to be between 0 and 1, even if they are stored in
536 * floats. Setting these bits here will ensure that the lp_build_conv() call
537 * below won't try to unnecessarily clamp the incoming values.
539 if(z_src_type
.floating
) {
540 z_src_type
.sign
= FALSE
;
541 z_src_type
.norm
= TRUE
;
544 assert(!z_src_type
.sign
);
545 assert(z_src_type
.norm
);
548 /* Pick the depth type. */
549 z_type
= lp_depth_type(format_desc
, z_src_type
.width
*z_src_type
.length
);
551 /* FIXME: Cope with a depth test type with a different bit width. */
552 assert(z_type
.width
== z_src_type
.width
);
553 assert(z_type
.length
== z_src_type
.length
);
555 /* Convert fragment Z from float to integer */
556 lp_build_conv(builder
, z_src_type
, z_type
, &z_src
, 1, &z_src
, 1);
559 /* Sanity checking */
561 const unsigned z_swizzle
= format_desc
->swizzle
[0];
562 const unsigned s_swizzle
= format_desc
->swizzle
[1];
564 assert(z_swizzle
!= UTIL_FORMAT_SWIZZLE_NONE
||
565 s_swizzle
!= UTIL_FORMAT_SWIZZLE_NONE
);
567 assert(depth
->enabled
|| stencil
[0].enabled
);
569 assert(format_desc
->colorspace
== UTIL_FORMAT_COLORSPACE_ZS
);
570 assert(format_desc
->block
.width
== 1);
571 assert(format_desc
->block
.height
== 1);
573 if (stencil
[0].enabled
) {
574 assert(format_desc
->format
== PIPE_FORMAT_Z24_UNORM_S8_USCALED
||
575 format_desc
->format
== PIPE_FORMAT_S8_USCALED_Z24_UNORM
);
578 assert(z_swizzle
< 4);
579 assert(format_desc
->block
.bits
== z_type
.width
);
580 if (z_type
.floating
) {
581 assert(z_swizzle
== 0);
582 assert(format_desc
->channel
[z_swizzle
].type
==
583 UTIL_FORMAT_TYPE_FLOAT
);
584 assert(format_desc
->channel
[z_swizzle
].size
==
585 format_desc
->block
.bits
);
588 assert(format_desc
->channel
[z_swizzle
].type
==
589 UTIL_FORMAT_TYPE_UNSIGNED
);
590 assert(format_desc
->channel
[z_swizzle
].normalized
);
591 assert(!z_type
.fixed
);
592 assert(!z_type
.sign
);
598 /* Setup build context for Z vals */
599 lp_build_context_init(&z_bld
, builder
, z_type
);
601 /* Setup build context for stencil vals */
602 s_type
= lp_type_int_vec(z_type
.width
);
603 lp_build_context_init(&s_bld
, builder
, s_type
);
605 /* Load current z/stencil value from z/stencil buffer */
606 zs_dst_ptr
= LLVMBuildBitCast(builder
,
608 LLVMPointerType(z_bld
.vec_type
, 0), "");
609 zs_dst
= LLVMBuildLoad(builder
, zs_dst_ptr
, "");
611 lp_build_name(zs_dst
, "zsbufval");
614 /* Compute and apply the Z/stencil bitmasks and shifts.
617 unsigned z_shift
, z_mask
;
618 unsigned s_shift
, s_mask
;
620 if (get_z_shift_and_mask(format_desc
, &z_shift
, &z_mask
)) {
622 LLVMValueRef shift
= lp_build_const_int_vec(z_type
, z_shift
);
623 z_src
= LLVMBuildLShr(builder
, z_src
, shift
, "");
626 if (z_mask
!= 0xffffffff) {
627 LLVMValueRef mask
= lp_build_const_int_vec(z_type
, z_mask
);
628 z_src
= LLVMBuildAnd(builder
, z_src
, mask
, "");
629 z_dst
= LLVMBuildAnd(builder
, zs_dst
, mask
, "");
630 z_bitmask
= mask
; /* used below */
636 lp_build_name(z_dst
, "zsbuf.z");
639 if (get_s_shift_and_mask(format_desc
, &s_shift
, &s_mask
)) {
641 LLVMValueRef shift
= lp_build_const_int_vec(s_type
, s_shift
);
642 stencil_vals
= LLVMBuildLShr(builder
, zs_dst
, shift
, "");
643 stencil_shift
= shift
; /* used below */
646 stencil_vals
= zs_dst
;
649 if (s_mask
!= 0xffffffff) {
650 LLVMValueRef mask
= lp_build_const_int_vec(s_type
, s_mask
);
651 stencil_vals
= LLVMBuildAnd(builder
, stencil_vals
, mask
, "");
654 lp_build_name(stencil_vals
, "stencil");
658 if (stencil
[0].enabled
) {
661 LLVMValueRef zero
= LLVMConstReal(LLVMFloatType(), 0.0);
663 /* front_facing = face > 0.0 ? ~0 : 0 */
664 front_facing
= LLVMBuildFCmp(builder
, LLVMRealUGT
, face
, zero
, "");
665 front_facing
= LLVMBuildSExt(builder
, front_facing
,
666 LLVMIntType(s_bld
.type
.length
*s_bld
.type
.width
),
668 front_facing
= LLVMBuildBitCast(builder
, front_facing
,
669 s_bld
.int_vec_type
, "");
672 /* convert scalar stencil refs into vectors */
673 stencil_refs
[0] = lp_build_broadcast_scalar(&s_bld
, stencil_refs
[0]);
674 stencil_refs
[1] = lp_build_broadcast_scalar(&s_bld
, stencil_refs
[1]);
676 s_pass_mask
= lp_build_stencil_test(&s_bld
, stencil
,
677 stencil_refs
, stencil_vals
,
680 /* apply stencil-fail operator */
682 LLVMValueRef s_fail_mask
= lp_build_andnot(&s_bld
, orig_mask
, s_pass_mask
);
683 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, S_FAIL_OP
,
684 stencil_refs
, stencil_vals
,
685 s_fail_mask
, front_facing
);
689 if (depth
->enabled
) {
690 /* compare src Z to dst Z, returning 'pass' mask */
691 z_pass
= lp_build_cmp(&z_bld
, depth
->func
, z_src
, z_dst
);
693 if (!stencil
[0].enabled
) {
694 /* We can potentially skip all remaining operations here, but only
695 * if stencil is disabled because we still need to update the stencil
696 * buffer values. Don't need to update Z buffer values.
698 lp_build_mask_update(mask
, z_pass
);
701 lp_build_mask_check(mask
);
706 if (depth
->writemask
) {
707 LLVMValueRef zselectmask
= lp_build_mask_value(mask
);
709 /* mask off bits that failed Z test */
710 zselectmask
= LLVMBuildAnd(builder
, zselectmask
, z_pass
, "");
712 /* mask off bits that failed stencil test */
714 zselectmask
= LLVMBuildAnd(builder
, zselectmask
, s_pass_mask
, "");
717 /* if combined Z/stencil format, mask off the stencil bits */
719 zselectmask
= LLVMBuildAnd(builder
, zselectmask
, z_bitmask
, "");
722 /* Mix the old and new Z buffer values.
723 * z_dst[i] = (zselectmask[i] & z_src[i]) | (~zselectmask[i] & z_dst[i])
725 z_dst
= lp_build_select_bitwise(&z_bld
, zselectmask
, z_src
, z_dst
);
728 if (stencil
[0].enabled
) {
729 /* update stencil buffer values according to z pass/fail result */
730 LLVMValueRef z_fail_mask
, z_pass_mask
;
732 /* apply Z-fail operator */
733 z_fail_mask
= lp_build_andnot(&z_bld
, orig_mask
, z_pass
);
734 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, Z_FAIL_OP
,
735 stencil_refs
, stencil_vals
,
736 z_fail_mask
, front_facing
);
738 /* apply Z-pass operator */
739 z_pass_mask
= LLVMBuildAnd(z_bld
.builder
, orig_mask
, z_pass
, "");
740 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, Z_PASS_OP
,
741 stencil_refs
, stencil_vals
,
742 z_pass_mask
, front_facing
);
746 /* No depth test: apply Z-pass operator to stencil buffer values which
747 * passed the stencil test.
749 s_pass_mask
= LLVMBuildAnd(s_bld
.builder
, orig_mask
, s_pass_mask
, "");
750 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, Z_PASS_OP
,
751 stencil_refs
, stencil_vals
,
752 s_pass_mask
, front_facing
);
755 /* The Z bits are already in the right place but we may need to shift the
756 * stencil bits before ORing Z with Stencil to make the final pixel value.
758 if (stencil_vals
&& stencil_shift
)
759 stencil_vals
= LLVMBuildShl(s_bld
.builder
, stencil_vals
,
762 /* Finally, merge/store the z/stencil values */
763 if ((depth
->enabled
&& depth
->writemask
) ||
764 (stencil
[0].enabled
&& stencil
[0].writemask
)) {
766 if (z_dst
&& stencil_vals
)
767 zs_dst
= LLVMBuildOr(z_bld
.builder
, z_dst
, stencil_vals
, "");
771 zs_dst
= stencil_vals
;
777 lp_build_mask_update(mask
, s_pass_mask
);
779 if (depth
->enabled
&& stencil
[0].enabled
)
780 lp_build_mask_update(mask
, z_pass
);
783 lp_build_mask_check(mask
);
789 lp_build_depth_write(LLVMBuilderRef builder
,
790 const struct util_format_description
*format_desc
,
791 LLVMValueRef zs_dst_ptr
,
792 LLVMValueRef zs_value
)
794 zs_dst_ptr
= LLVMBuildBitCast(builder
, zs_dst_ptr
,
795 LLVMPointerType(LLVMTypeOf(zs_value
), 0), "");
797 LLVMBuildStore(builder
, zs_value
, zs_dst_ptr
);
802 lp_build_deferred_depth_write(LLVMBuilderRef builder
,
803 struct lp_type z_src_type
,
804 const struct util_format_description
*format_desc
,
805 struct lp_build_mask_context
*mask
,
806 LLVMValueRef zs_dst_ptr
,
807 LLVMValueRef zs_value
)
809 struct lp_type z_type
;
810 struct lp_build_context z_bld
;
813 /* XXX: pointlessly redo type logic:
815 z_type
= lp_depth_type(format_desc
, z_src_type
.width
*z_src_type
.length
);
816 lp_build_context_init(&z_bld
, builder
, z_type
);
818 zs_dst_ptr
= LLVMBuildBitCast(builder
, zs_dst_ptr
,
819 LLVMPointerType(z_bld
.vec_type
, 0), "");
821 z_dst
= LLVMBuildLoad(builder
, zs_dst_ptr
, "zsbufval");
822 z_dst
= lp_build_select(&z_bld
, lp_build_mask_value(mask
), zs_value
, z_dst
);
824 LLVMBuildStore(builder
, z_dst
, zs_dst_ptr
);