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 * Since we're using linear layout for everything, but we need to deal with
40 * 2x2 quads, we need to load/store multiple values and swizzle them into
41 * place (we could avoid this by doing depth/stencil testing in linear format,
42 * which would be easy for late depth/stencil test as we could do that after
43 * the fragment shader loop just as we do for color buffers, but more tricky
44 * for early depth test as we'd need both masks and interpolated depth in
48 * @author Jose Fonseca <jfonseca@vmware.com>
49 * @author Brian Paul <jfonseca@vmware.com>
52 #include "pipe/p_state.h"
53 #include "util/u_format.h"
54 #include "util/u_cpu_detect.h"
56 #include "gallivm/lp_bld_type.h"
57 #include "gallivm/lp_bld_arit.h"
58 #include "gallivm/lp_bld_bitarit.h"
59 #include "gallivm/lp_bld_const.h"
60 #include "gallivm/lp_bld_conv.h"
61 #include "gallivm/lp_bld_logic.h"
62 #include "gallivm/lp_bld_flow.h"
63 #include "gallivm/lp_bld_intr.h"
64 #include "gallivm/lp_bld_debug.h"
65 #include "gallivm/lp_bld_swizzle.h"
66 #include "gallivm/lp_bld_pack.h"
68 #include "lp_bld_depth.h"
71 /** Used to select fields from pipe_stencil_state */
81 * Do the stencil test comparison (compare FB stencil values against ref value).
82 * This will be used twice when generating two-sided stencil code.
83 * \param stencil the front/back stencil state
84 * \param stencilRef the stencil reference value, replicated as a vector
85 * \param stencilVals vector of stencil values from framebuffer
86 * \return vector mask of pass/fail values (~0 or 0)
89 lp_build_stencil_test_single(struct lp_build_context
*bld
,
90 const struct pipe_stencil_state
*stencil
,
91 LLVMValueRef stencilRef
,
92 LLVMValueRef stencilVals
)
94 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
95 const unsigned stencilMax
= 255; /* XXX fix */
96 struct lp_type type
= bld
->type
;
100 * SSE2 has intrinsics for signed comparisons, but not unsigned ones. Values
101 * are between 0..255 so ensure we generate the fastest comparisons for
104 if (type
.width
<= 8) {
110 assert(stencil
->enabled
);
112 if (stencil
->valuemask
!= stencilMax
) {
113 /* compute stencilRef = stencilRef & valuemask */
114 LLVMValueRef valuemask
= lp_build_const_int_vec(bld
->gallivm
, type
, stencil
->valuemask
);
115 stencilRef
= LLVMBuildAnd(builder
, stencilRef
, valuemask
, "");
116 /* compute stencilVals = stencilVals & valuemask */
117 stencilVals
= LLVMBuildAnd(builder
, stencilVals
, valuemask
, "");
120 res
= lp_build_cmp(bld
, stencil
->func
, stencilRef
, stencilVals
);
127 * Do the one or two-sided stencil test comparison.
128 * \sa lp_build_stencil_test_single
129 * \param front_facing an integer vector mask, indicating front (~0) or back
130 * (0) facing polygon. If NULL, assume front-facing.
133 lp_build_stencil_test(struct lp_build_context
*bld
,
134 const struct pipe_stencil_state stencil
[2],
135 LLVMValueRef stencilRefs
[2],
136 LLVMValueRef stencilVals
,
137 LLVMValueRef front_facing
)
141 assert(stencil
[0].enabled
);
143 /* do front face test */
144 res
= lp_build_stencil_test_single(bld
, &stencil
[0],
145 stencilRefs
[0], stencilVals
);
147 if (stencil
[1].enabled
&& front_facing
!= NULL
) {
148 /* do back face test */
149 LLVMValueRef back_res
;
151 back_res
= lp_build_stencil_test_single(bld
, &stencil
[1],
152 stencilRefs
[1], stencilVals
);
154 res
= lp_build_select(bld
, front_facing
, res
, back_res
);
162 * Apply the stencil operator (add/sub/keep/etc) to the given vector
164 * \return new stencil values vector
167 lp_build_stencil_op_single(struct lp_build_context
*bld
,
168 const struct pipe_stencil_state
*stencil
,
170 LLVMValueRef stencilRef
,
171 LLVMValueRef stencilVals
)
174 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
175 struct lp_type type
= bld
->type
;
177 LLVMValueRef max
= lp_build_const_int_vec(bld
->gallivm
, type
, 0xff);
184 stencil_op
= stencil
->fail_op
;
187 stencil_op
= stencil
->zfail_op
;
190 stencil_op
= stencil
->zpass_op
;
193 assert(0 && "Invalid stencil_op mode");
194 stencil_op
= PIPE_STENCIL_OP_KEEP
;
197 switch (stencil_op
) {
198 case PIPE_STENCIL_OP_KEEP
:
200 /* we can return early for this case */
202 case PIPE_STENCIL_OP_ZERO
:
205 case PIPE_STENCIL_OP_REPLACE
:
208 case PIPE_STENCIL_OP_INCR
:
209 res
= lp_build_add(bld
, stencilVals
, bld
->one
);
210 res
= lp_build_min(bld
, res
, max
);
212 case PIPE_STENCIL_OP_DECR
:
213 res
= lp_build_sub(bld
, stencilVals
, bld
->one
);
214 res
= lp_build_max(bld
, res
, bld
->zero
);
216 case PIPE_STENCIL_OP_INCR_WRAP
:
217 res
= lp_build_add(bld
, stencilVals
, bld
->one
);
218 res
= LLVMBuildAnd(builder
, res
, max
, "");
220 case PIPE_STENCIL_OP_DECR_WRAP
:
221 res
= lp_build_sub(bld
, stencilVals
, bld
->one
);
222 res
= LLVMBuildAnd(builder
, res
, max
, "");
224 case PIPE_STENCIL_OP_INVERT
:
225 res
= LLVMBuildNot(builder
, stencilVals
, "");
226 res
= LLVMBuildAnd(builder
, res
, max
, "");
229 assert(0 && "bad stencil op mode");
238 * Do the one or two-sided stencil test op/update.
241 lp_build_stencil_op(struct lp_build_context
*bld
,
242 const struct pipe_stencil_state stencil
[2],
244 LLVMValueRef stencilRefs
[2],
245 LLVMValueRef stencilVals
,
247 LLVMValueRef front_facing
)
250 LLVMBuilderRef builder
= bld
->gallivm
->builder
;
253 assert(stencil
[0].enabled
);
255 /* do front face op */
256 res
= lp_build_stencil_op_single(bld
, &stencil
[0], op
,
257 stencilRefs
[0], stencilVals
);
259 if (stencil
[1].enabled
&& front_facing
!= NULL
) {
260 /* do back face op */
261 LLVMValueRef back_res
;
263 back_res
= lp_build_stencil_op_single(bld
, &stencil
[1], op
,
264 stencilRefs
[1], stencilVals
);
266 res
= lp_build_select(bld
, front_facing
, res
, back_res
);
269 if (stencil
[0].writemask
!= 0xff ||
270 (stencil
[1].enabled
&& front_facing
!= NULL
&& stencil
[1].writemask
!= 0xff)) {
271 /* mask &= stencil[0].writemask */
272 LLVMValueRef writemask
= lp_build_const_int_vec(bld
->gallivm
, bld
->type
,
273 stencil
[0].writemask
);
274 if (stencil
[1].enabled
&& stencil
[1].writemask
!= stencil
[0].writemask
&& front_facing
!= NULL
) {
275 LLVMValueRef back_writemask
= lp_build_const_int_vec(bld
->gallivm
, bld
->type
,
276 stencil
[1].writemask
);
277 writemask
= lp_build_select(bld
, front_facing
, writemask
, back_writemask
);
280 mask
= LLVMBuildAnd(builder
, mask
, writemask
, "");
281 /* res = (res & mask) | (stencilVals & ~mask) */
282 res
= lp_build_select_bitwise(bld
, mask
, res
, stencilVals
);
285 /* res = mask ? res : stencilVals */
286 res
= lp_build_select(bld
, mask
, res
, stencilVals
);
295 * Return a type that matches the depth/stencil format.
298 lp_depth_type(const struct util_format_description
*format_desc
,
304 assert(format_desc
->colorspace
== UTIL_FORMAT_COLORSPACE_ZS
);
305 assert(format_desc
->block
.width
== 1);
306 assert(format_desc
->block
.height
== 1);
308 memset(&type
, 0, sizeof type
);
309 type
.width
= format_desc
->block
.bits
;
311 z_swizzle
= format_desc
->swizzle
[0];
313 if (format_desc
->channel
[z_swizzle
].type
== UTIL_FORMAT_TYPE_FLOAT
) {
314 type
.floating
= TRUE
;
315 assert(z_swizzle
== 0);
316 assert(format_desc
->channel
[z_swizzle
].size
== 32);
318 else if(format_desc
->channel
[z_swizzle
].type
== UTIL_FORMAT_TYPE_UNSIGNED
) {
319 assert(format_desc
->block
.bits
<= 32);
320 assert(format_desc
->channel
[z_swizzle
].normalized
);
321 if (format_desc
->channel
[z_swizzle
].size
< format_desc
->block
.bits
) {
322 /* Prefer signed integers when possible, as SSE has less support
323 * for unsigned comparison;
332 type
.length
= length
;
339 * Compute bitmask and bit shift to apply to the incoming fragment Z values
340 * and the Z buffer values needed before doing the Z comparison.
342 * Note that we leave the Z bits in the position that we find them
343 * in the Z buffer (typically 0xffffff00 or 0x00ffffff). That lets us
344 * get by with fewer bit twiddling steps.
347 get_z_shift_and_mask(const struct util_format_description
*format_desc
,
348 unsigned *shift
, unsigned *width
, unsigned *mask
)
353 unsigned padding_left
, padding_right
;
355 assert(format_desc
->colorspace
== UTIL_FORMAT_COLORSPACE_ZS
);
356 assert(format_desc
->block
.width
== 1);
357 assert(format_desc
->block
.height
== 1);
359 /* 64bit d/s format is special already extracted 32 bits */
360 total_bits
= format_desc
->block
.bits
> 32 ? 32 : format_desc
->block
.bits
;
362 z_swizzle
= format_desc
->swizzle
[0];
364 if (z_swizzle
== UTIL_FORMAT_SWIZZLE_NONE
)
367 *width
= format_desc
->channel
[z_swizzle
].size
;
370 for (chan
= 0; chan
< z_swizzle
; ++chan
)
371 padding_right
+= format_desc
->channel
[chan
].size
;
374 total_bits
- (padding_right
+ *width
);
376 if (padding_left
|| padding_right
) {
377 unsigned long long mask_left
= (1ULL << (total_bits
- padding_left
)) - 1;
378 unsigned long long mask_right
= (1ULL << (padding_right
)) - 1;
379 *mask
= mask_left
^ mask_right
;
385 *shift
= padding_right
;
392 * Compute bitmask and bit shift to apply to the framebuffer pixel values
393 * to put the stencil bits in the least significant position.
397 get_s_shift_and_mask(const struct util_format_description
*format_desc
,
398 unsigned *shift
, unsigned *mask
)
403 s_swizzle
= format_desc
->swizzle
[1];
405 if (s_swizzle
== UTIL_FORMAT_SWIZZLE_NONE
)
408 /* just special case 64bit d/s format */
409 if (format_desc
->block
.bits
> 32) {
410 assert(format_desc
->format
== PIPE_FORMAT_Z32_FLOAT_S8X24_UINT
);
417 for (chan
= 0; chan
< s_swizzle
; chan
++)
418 *shift
+= format_desc
->channel
[chan
].size
;
420 sz
= format_desc
->channel
[s_swizzle
].size
;
421 *mask
= (1U << sz
) - 1U;
428 * Perform the occlusion test and increase the counter.
429 * Test the depth mask. Add the number of channel which has none zero mask
430 * into the occlusion counter. e.g. maskvalue is {-1, -1, -1, -1}.
431 * The counter will add 4.
433 * \param type holds element type of the mask vector.
434 * \param maskvalue is the depth test mask.
435 * \param counter is a pointer of the uint32 counter.
438 lp_build_occlusion_count(struct gallivm_state
*gallivm
,
440 LLVMValueRef maskvalue
,
441 LLVMValueRef counter
)
443 LLVMBuilderRef builder
= gallivm
->builder
;
444 LLVMContextRef context
= gallivm
->context
;
445 LLVMValueRef countmask
= lp_build_const_int_vec(gallivm
, type
, 1);
446 LLVMValueRef count
, newcount
;
448 assert(type
.length
<= 16);
449 assert(type
.floating
);
451 if(util_cpu_caps
.has_sse
&& type
.length
== 4) {
452 const char *movmskintr
= "llvm.x86.sse.movmsk.ps";
453 const char *popcntintr
= "llvm.ctpop.i32";
454 LLVMValueRef bits
= LLVMBuildBitCast(builder
, maskvalue
,
455 lp_build_vec_type(gallivm
, type
), "");
456 bits
= lp_build_intrinsic_unary(builder
, movmskintr
,
457 LLVMInt32TypeInContext(context
), bits
);
458 count
= lp_build_intrinsic_unary(builder
, popcntintr
,
459 LLVMInt32TypeInContext(context
), bits
);
461 else if(util_cpu_caps
.has_avx
&& type
.length
== 8) {
462 const char *movmskintr
= "llvm.x86.avx.movmsk.ps.256";
463 const char *popcntintr
= "llvm.ctpop.i32";
464 LLVMValueRef bits
= LLVMBuildBitCast(builder
, maskvalue
,
465 lp_build_vec_type(gallivm
, type
), "");
466 bits
= lp_build_intrinsic_unary(builder
, movmskintr
,
467 LLVMInt32TypeInContext(context
), bits
);
468 count
= lp_build_intrinsic_unary(builder
, popcntintr
,
469 LLVMInt32TypeInContext(context
), bits
);
473 LLVMValueRef countv
= LLVMBuildAnd(builder
, maskvalue
, countmask
, "countv");
474 LLVMTypeRef counttype
= LLVMIntTypeInContext(context
, type
.length
* 8);
475 LLVMTypeRef i8vntype
= LLVMVectorType(LLVMInt8TypeInContext(context
), type
.length
* 4);
476 LLVMValueRef shufflev
, countd
;
477 LLVMValueRef shuffles
[16];
478 const char *popcntintr
= NULL
;
480 countv
= LLVMBuildBitCast(builder
, countv
, i8vntype
, "");
482 for (i
= 0; i
< type
.length
; i
++) {
483 shuffles
[i
] = lp_build_const_int32(gallivm
, 4*i
);
486 shufflev
= LLVMConstVector(shuffles
, type
.length
);
487 countd
= LLVMBuildShuffleVector(builder
, countv
, LLVMGetUndef(i8vntype
), shufflev
, "");
488 countd
= LLVMBuildBitCast(builder
, countd
, counttype
, "countd");
492 * this is bad on cpus without popcount (on x86 supported by intel
493 * nehalem, amd barcelona, and up - not tied to sse42).
494 * Would be much faster to just sum the 4 elements of the vector with
495 * some horizontal add (shuffle/add/shuffle/add after the initial and).
497 switch (type
.length
) {
499 popcntintr
= "llvm.ctpop.i32";
502 popcntintr
= "llvm.ctpop.i64";
505 popcntintr
= "llvm.ctpop.i128";
510 count
= lp_build_intrinsic_unary(builder
, popcntintr
, counttype
, countd
);
512 if (type
.length
> 4) {
513 count
= LLVMBuildTrunc(builder
, count
, LLVMIntTypeInContext(context
, 32), "");
516 newcount
= LLVMBuildLoad(builder
, counter
, "origcount");
517 newcount
= LLVMBuildAdd(builder
, newcount
, count
, "newcount");
518 LLVMBuildStore(builder
, newcount
, counter
);
523 * Load depth/stencil values.
524 * The stored values are linear, swizzle them.
526 * \param type the data type of the fragment depth/stencil values
527 * \param format_desc description of the depth/stencil surface
528 * \param is_1d whether this resource has only one dimension
529 * \param loop_counter the current loop iteration
530 * \param depth_ptr pointer to the depth/stencil values of this 4x4 block
531 * \param depth_stride stride of the depth/stencil buffer
532 * \param z_fb contains z values loaded from fb (may include padding)
533 * \param s_fb contains s values loaded from fb (may include padding)
536 lp_build_depth_stencil_load_swizzled(struct gallivm_state
*gallivm
,
537 struct lp_type z_src_type
,
538 const struct util_format_description
*format_desc
,
540 LLVMValueRef depth_ptr
,
541 LLVMValueRef depth_stride
,
544 LLVMValueRef loop_counter
)
546 LLVMBuilderRef builder
= gallivm
->builder
;
547 LLVMValueRef shuffles
[LP_MAX_VECTOR_LENGTH
/ 4];
548 LLVMValueRef zs_dst1
, zs_dst2
;
549 LLVMValueRef zs_dst_ptr
;
550 LLVMValueRef depth_offset1
, depth_offset2
;
551 LLVMTypeRef load_ptr_type
;
552 unsigned depth_bytes
= format_desc
->block
.bits
/ 8;
553 struct lp_type zs_type
= lp_depth_type(format_desc
, z_src_type
.length
);
554 struct lp_type zs_load_type
= zs_type
;
556 zs_load_type
.length
= zs_load_type
.length
/ 2;
557 load_ptr_type
= LLVMPointerType(lp_build_vec_type(gallivm
, zs_load_type
), 0);
559 if (z_src_type
.length
== 4) {
561 LLVMValueRef looplsb
= LLVMBuildAnd(builder
, loop_counter
,
562 lp_build_const_int32(gallivm
, 1), "");
563 LLVMValueRef loopmsb
= LLVMBuildAnd(builder
, loop_counter
,
564 lp_build_const_int32(gallivm
, 2), "");
565 LLVMValueRef offset2
= LLVMBuildMul(builder
, loopmsb
,
567 depth_offset1
= LLVMBuildMul(builder
, looplsb
,
568 lp_build_const_int32(gallivm
, depth_bytes
* 2), "");
569 depth_offset1
= LLVMBuildAdd(builder
, depth_offset1
, offset2
, "");
571 /* just concatenate the loaded 2x2 values into 4-wide vector */
572 for (i
= 0; i
< 4; i
++) {
573 shuffles
[i
] = lp_build_const_int32(gallivm
, i
);
578 LLVMValueRef loopx2
= LLVMBuildShl(builder
, loop_counter
,
579 lp_build_const_int32(gallivm
, 1), "");
580 assert(z_src_type
.length
== 8);
581 depth_offset1
= LLVMBuildMul(builder
, loopx2
, depth_stride
, "");
583 * We load 2x4 values, and need to swizzle them (order
584 * 0,1,4,5,2,3,6,7) - not so hot with avx unfortunately.
586 for (i
= 0; i
< 8; i
++) {
587 shuffles
[i
] = lp_build_const_int32(gallivm
, (i
&1) + (i
&2) * 2 + (i
&4) / 2);
591 depth_offset2
= LLVMBuildAdd(builder
, depth_offset1
, depth_stride
, "");
593 /* Load current z/stencil values from z/stencil buffer */
594 zs_dst_ptr
= LLVMBuildGEP(builder
, depth_ptr
, &depth_offset1
, 1, "");
595 zs_dst_ptr
= LLVMBuildBitCast(builder
, zs_dst_ptr
, load_ptr_type
, "");
596 zs_dst1
= LLVMBuildLoad(builder
, zs_dst_ptr
, "");
598 zs_dst2
= lp_build_undef(gallivm
, zs_load_type
);
601 zs_dst_ptr
= LLVMBuildGEP(builder
, depth_ptr
, &depth_offset2
, 1, "");
602 zs_dst_ptr
= LLVMBuildBitCast(builder
, zs_dst_ptr
, load_ptr_type
, "");
603 zs_dst2
= LLVMBuildLoad(builder
, zs_dst_ptr
, "");
606 *z_fb
= LLVMBuildShuffleVector(builder
, zs_dst1
, zs_dst2
,
607 LLVMConstVector(shuffles
, zs_type
.length
), "");
610 if (format_desc
->block
.bits
< z_src_type
.width
) {
611 /* Extend destination ZS values (e.g., when reading from Z16_UNORM) */
612 *z_fb
= LLVMBuildZExt(builder
, *z_fb
,
613 lp_build_int_vec_type(gallivm
, z_src_type
), "");
616 else if (format_desc
->block
.bits
> 32) {
617 /* rely on llvm to handle too wide vector we have here nicely */
619 struct lp_type typex2
= zs_type
;
620 struct lp_type s_type
= zs_type
;
621 LLVMValueRef shuffles1
[LP_MAX_VECTOR_LENGTH
/ 4];
622 LLVMValueRef shuffles2
[LP_MAX_VECTOR_LENGTH
/ 4];
625 typex2
.width
= typex2
.width
/ 2;
626 typex2
.length
= typex2
.length
* 2;
627 s_type
.width
= s_type
.width
/ 2;
630 tmp
= LLVMBuildBitCast(builder
, *z_fb
,
631 lp_build_vec_type(gallivm
, typex2
), "");
633 for (i
= 0; i
< zs_type
.length
; i
++) {
634 shuffles1
[i
] = lp_build_const_int32(gallivm
, i
* 2);
635 shuffles2
[i
] = lp_build_const_int32(gallivm
, i
* 2 + 1);
637 *z_fb
= LLVMBuildShuffleVector(builder
, tmp
, tmp
,
638 LLVMConstVector(shuffles1
, zs_type
.length
), "");
639 *s_fb
= LLVMBuildShuffleVector(builder
, tmp
, tmp
,
640 LLVMConstVector(shuffles2
, zs_type
.length
), "");
641 *s_fb
= LLVMBuildBitCast(builder
, *s_fb
,
642 lp_build_vec_type(gallivm
, s_type
), "");
643 lp_build_name(*s_fb
, "s_dst");
646 lp_build_name(*z_fb
, "z_dst");
647 lp_build_name(*s_fb
, "s_dst");
648 lp_build_name(*z_fb
, "z_dst");
652 * Store depth/stencil values.
653 * Incoming values are swizzled (typically n 2x2 quads), stored linear.
654 * If there's a mask it will do select/store otherwise just store.
656 * \param type the data type of the fragment depth/stencil values
657 * \param format_desc description of the depth/stencil surface
658 * \param is_1d whether this resource has only one dimension
659 * \param mask the alive/dead pixel mask for the quad (vector)
660 * \param z_fb z values read from fb (with padding)
661 * \param s_fb s values read from fb (with padding)
662 * \param loop_counter the current loop iteration
663 * \param depth_ptr pointer to the depth/stencil values of this 4x4 block
664 * \param depth_stride stride of the depth/stencil buffer
665 * \param z_value the depth values to store (with padding)
666 * \param s_value the stencil values to store (with padding)
669 lp_build_depth_stencil_write_swizzled(struct gallivm_state
*gallivm
,
670 struct lp_type z_src_type
,
671 const struct util_format_description
*format_desc
,
673 struct lp_build_mask_context
*mask
,
676 LLVMValueRef loop_counter
,
677 LLVMValueRef depth_ptr
,
678 LLVMValueRef depth_stride
,
679 LLVMValueRef z_value
,
680 LLVMValueRef s_value
)
682 struct lp_build_context z_bld
;
683 LLVMValueRef shuffles
[LP_MAX_VECTOR_LENGTH
/ 4];
684 LLVMBuilderRef builder
= gallivm
->builder
;
685 LLVMValueRef mask_value
= NULL
;
686 LLVMValueRef zs_dst1
, zs_dst2
;
687 LLVMValueRef zs_dst_ptr1
, zs_dst_ptr2
;
688 LLVMValueRef depth_offset1
, depth_offset2
;
689 LLVMTypeRef load_ptr_type
;
690 unsigned depth_bytes
= format_desc
->block
.bits
/ 8;
691 struct lp_type zs_type
= lp_depth_type(format_desc
, z_src_type
.length
);
692 struct lp_type z_type
= zs_type
;
693 struct lp_type zs_load_type
= zs_type
;
695 zs_load_type
.length
= zs_load_type
.length
/ 2;
696 load_ptr_type
= LLVMPointerType(lp_build_vec_type(gallivm
, zs_load_type
), 0);
698 z_type
.width
= z_src_type
.width
;
700 lp_build_context_init(&z_bld
, gallivm
, z_type
);
703 * This is far from ideal, at least for late depth write we should do this
704 * outside the fs loop to avoid all the swizzle stuff.
706 if (z_src_type
.length
== 4) {
707 LLVMValueRef looplsb
= LLVMBuildAnd(builder
, loop_counter
,
708 lp_build_const_int32(gallivm
, 1), "");
709 LLVMValueRef loopmsb
= LLVMBuildAnd(builder
, loop_counter
,
710 lp_build_const_int32(gallivm
, 2), "");
711 LLVMValueRef offset2
= LLVMBuildMul(builder
, loopmsb
,
713 depth_offset1
= LLVMBuildMul(builder
, looplsb
,
714 lp_build_const_int32(gallivm
, depth_bytes
* 2), "");
715 depth_offset1
= LLVMBuildAdd(builder
, depth_offset1
, offset2
, "");
719 LLVMValueRef loopx2
= LLVMBuildShl(builder
, loop_counter
,
720 lp_build_const_int32(gallivm
, 1), "");
721 assert(z_src_type
.length
== 8);
722 depth_offset1
= LLVMBuildMul(builder
, loopx2
, depth_stride
, "");
724 * We load 2x4 values, and need to swizzle them (order
725 * 0,1,4,5,2,3,6,7) - not so hot with avx unfortunately.
727 for (i
= 0; i
< 8; i
++) {
728 shuffles
[i
] = lp_build_const_int32(gallivm
, (i
&1) + (i
&2) * 2 + (i
&4) / 2);
732 depth_offset2
= LLVMBuildAdd(builder
, depth_offset1
, depth_stride
, "");
734 zs_dst_ptr1
= LLVMBuildGEP(builder
, depth_ptr
, &depth_offset1
, 1, "");
735 zs_dst_ptr1
= LLVMBuildBitCast(builder
, zs_dst_ptr1
, load_ptr_type
, "");
736 zs_dst_ptr2
= LLVMBuildGEP(builder
, depth_ptr
, &depth_offset2
, 1, "");
737 zs_dst_ptr2
= LLVMBuildBitCast(builder
, zs_dst_ptr2
, load_ptr_type
, "");
739 if (format_desc
->block
.bits
> 32) {
740 s_value
= LLVMBuildBitCast(builder
, s_value
, z_bld
.vec_type
, "");
744 mask_value
= lp_build_mask_value(mask
);
745 z_value
= lp_build_select(&z_bld
, mask_value
, z_value
, z_fb
);
746 if (format_desc
->block
.bits
> 32) {
747 s_fb
= LLVMBuildBitCast(builder
, s_fb
, z_bld
.vec_type
, "");
748 s_value
= lp_build_select(&z_bld
, mask_value
, s_value
, s_fb
);
752 if (zs_type
.width
< z_src_type
.width
) {
753 /* Truncate ZS values (e.g., when writing to Z16_UNORM) */
754 z_value
= LLVMBuildTrunc(builder
, z_value
,
755 lp_build_int_vec_type(gallivm
, zs_type
), "");
758 if (format_desc
->block
.bits
<= 32) {
759 if (z_src_type
.length
== 4) {
760 zs_dst1
= lp_build_extract_range(gallivm
, z_value
, 0, 2);
761 zs_dst2
= lp_build_extract_range(gallivm
, z_value
, 2, 2);
764 assert(z_src_type
.length
== 8);
765 zs_dst1
= LLVMBuildShuffleVector(builder
, z_value
, z_value
,
766 LLVMConstVector(&shuffles
[0],
767 zs_load_type
.length
), "");
768 zs_dst2
= LLVMBuildShuffleVector(builder
, z_value
, z_value
,
769 LLVMConstVector(&shuffles
[4],
770 zs_load_type
.length
), "");
774 if (z_src_type
.length
== 4) {
775 zs_dst1
= lp_build_interleave2(gallivm
, z_type
,
776 z_value
, s_value
, 0);
777 zs_dst2
= lp_build_interleave2(gallivm
, z_type
,
778 z_value
, s_value
, 1);
782 LLVMValueRef shuffles
[LP_MAX_VECTOR_LENGTH
/ 2];
783 assert(z_src_type
.length
== 8);
784 for (i
= 0; i
< 8; i
++) {
785 shuffles
[i
*2] = lp_build_const_int32(gallivm
, (i
&1) + (i
&2) * 2 + (i
&4) / 2);
786 shuffles
[i
*2+1] = lp_build_const_int32(gallivm
, (i
&1) + (i
&2) * 2 + (i
&4) / 2 +
789 zs_dst1
= LLVMBuildShuffleVector(builder
, z_value
, s_value
,
790 LLVMConstVector(&shuffles
[0],
791 z_src_type
.length
), "");
792 zs_dst2
= LLVMBuildShuffleVector(builder
, z_value
, s_value
,
793 LLVMConstVector(&shuffles
[8],
794 z_src_type
.length
), "");
796 zs_dst1
= LLVMBuildBitCast(builder
, zs_dst1
,
797 lp_build_vec_type(gallivm
, zs_load_type
), "");
798 zs_dst2
= LLVMBuildBitCast(builder
, zs_dst2
,
799 lp_build_vec_type(gallivm
, zs_load_type
), "");
802 LLVMBuildStore(builder
, zs_dst1
, zs_dst_ptr1
);
804 LLVMBuildStore(builder
, zs_dst2
, zs_dst_ptr2
);
809 * Generate code for performing depth and/or stencil tests.
810 * We operate on a vector of values (typically n 2x2 quads).
812 * \param depth the depth test state
813 * \param stencil the front/back stencil state
814 * \param type the data type of the fragment depth/stencil values
815 * \param format_desc description of the depth/stencil surface
816 * \param mask the alive/dead pixel mask for the quad (vector)
817 * \param stencil_refs the front/back stencil ref values (scalar)
818 * \param z_src the incoming depth/stencil values (n 2x2 quad values, float32)
819 * \param zs_dst the depth/stencil values in framebuffer
820 * \param face contains boolean value indicating front/back facing polygon
823 lp_build_depth_stencil_test(struct gallivm_state
*gallivm
,
824 const struct pipe_depth_state
*depth
,
825 const struct pipe_stencil_state stencil
[2],
826 struct lp_type z_src_type
,
827 const struct util_format_description
*format_desc
,
828 struct lp_build_mask_context
*mask
,
829 LLVMValueRef stencil_refs
[2],
834 LLVMValueRef
*z_value
,
835 LLVMValueRef
*s_value
,
838 LLVMBuilderRef builder
= gallivm
->builder
;
839 struct lp_type z_type
;
840 struct lp_build_context z_bld
;
841 struct lp_build_context s_bld
;
842 struct lp_type s_type
;
843 unsigned z_shift
= 0, z_width
= 0, z_mask
= 0;
844 LLVMValueRef z_dst
= NULL
;
845 LLVMValueRef stencil_vals
= NULL
;
846 LLVMValueRef z_bitmask
= NULL
, stencil_shift
= NULL
;
847 LLVMValueRef z_pass
= NULL
, s_pass_mask
= NULL
;
848 LLVMValueRef orig_mask
= lp_build_mask_value(mask
);
849 LLVMValueRef front_facing
= NULL
;
850 boolean have_z
, have_s
;
853 * Depths are expected to be between 0 and 1, even if they are stored in
854 * floats. Setting these bits here will ensure that the lp_build_conv() call
855 * below won't try to unnecessarily clamp the incoming values.
857 if(z_src_type
.floating
) {
858 z_src_type
.sign
= FALSE
;
859 z_src_type
.norm
= TRUE
;
862 assert(!z_src_type
.sign
);
863 assert(z_src_type
.norm
);
866 /* Pick the type matching the depth-stencil format. */
867 z_type
= lp_depth_type(format_desc
, z_src_type
.length
);
869 /* Pick the intermediate type for depth operations. */
870 z_type
.width
= z_src_type
.width
;
871 assert(z_type
.length
== z_src_type
.length
);
873 /* FIXME: for non-float depth/stencil might generate better code
874 * if we'd always split it up to use 128bit operations.
875 * For stencil we'd almost certainly want to pack to 8xi16 values,
876 * for z just run twice.
879 /* Sanity checking */
881 const unsigned z_swizzle
= format_desc
->swizzle
[0];
882 const unsigned s_swizzle
= format_desc
->swizzle
[1];
884 assert(z_swizzle
!= UTIL_FORMAT_SWIZZLE_NONE
||
885 s_swizzle
!= UTIL_FORMAT_SWIZZLE_NONE
);
887 assert(depth
->enabled
|| stencil
[0].enabled
);
889 assert(format_desc
->colorspace
== UTIL_FORMAT_COLORSPACE_ZS
);
890 assert(format_desc
->block
.width
== 1);
891 assert(format_desc
->block
.height
== 1);
893 if (stencil
[0].enabled
) {
894 assert(s_swizzle
< 4);
895 assert(format_desc
->channel
[s_swizzle
].type
== UTIL_FORMAT_TYPE_UNSIGNED
);
896 assert(format_desc
->channel
[s_swizzle
].pure_integer
);
897 assert(!format_desc
->channel
[s_swizzle
].normalized
);
898 assert(format_desc
->channel
[s_swizzle
].size
== 8);
901 if (depth
->enabled
) {
902 assert(z_swizzle
< 4);
903 if (z_type
.floating
) {
904 assert(z_swizzle
== 0);
905 assert(format_desc
->channel
[z_swizzle
].type
==
906 UTIL_FORMAT_TYPE_FLOAT
);
907 assert(format_desc
->channel
[z_swizzle
].size
== 32);
910 assert(format_desc
->channel
[z_swizzle
].type
==
911 UTIL_FORMAT_TYPE_UNSIGNED
);
912 assert(format_desc
->channel
[z_swizzle
].normalized
);
913 assert(!z_type
.fixed
);
919 /* Setup build context for Z vals */
920 lp_build_context_init(&z_bld
, gallivm
, z_type
);
922 /* Setup build context for stencil vals */
923 s_type
= lp_int_type(z_type
);
924 lp_build_context_init(&s_bld
, gallivm
, s_type
);
926 /* Compute and apply the Z/stencil bitmasks and shifts.
929 unsigned s_shift
, s_mask
;
934 have_z
= get_z_shift_and_mask(format_desc
, &z_shift
, &z_width
, &z_mask
);
935 have_s
= get_s_shift_and_mask(format_desc
, &s_shift
, &s_mask
);
938 if (z_mask
!= 0xffffffff) {
939 z_bitmask
= lp_build_const_int_vec(gallivm
, z_type
, z_mask
);
943 * Align the framebuffer Z 's LSB to the right.
946 LLVMValueRef shift
= lp_build_const_int_vec(gallivm
, z_type
, z_shift
);
947 z_dst
= LLVMBuildLShr(builder
, z_dst
, shift
, "z_dst");
948 } else if (z_bitmask
) {
949 z_dst
= LLVMBuildAnd(builder
, z_dst
, z_bitmask
, "z_dst");
951 lp_build_name(z_dst
, "z_dst");
957 LLVMValueRef shift
= lp_build_const_int_vec(gallivm
, s_type
, s_shift
);
958 stencil_vals
= LLVMBuildLShr(builder
, stencil_vals
, shift
, "");
959 stencil_shift
= shift
; /* used below */
962 if (s_mask
!= 0xffffffff) {
963 LLVMValueRef mask
= lp_build_const_int_vec(gallivm
, s_type
, s_mask
);
964 stencil_vals
= LLVMBuildAnd(builder
, stencil_vals
, mask
, "");
967 lp_build_name(stencil_vals
, "s_dst");
971 if (stencil
[0].enabled
) {
974 LLVMValueRef zero
= lp_build_const_int32(gallivm
, 0);
976 /* front_facing = face != 0 ? ~0 : 0 */
977 front_facing
= LLVMBuildICmp(builder
, LLVMIntNE
, face
, zero
, "");
978 front_facing
= LLVMBuildSExt(builder
, front_facing
,
979 LLVMIntTypeInContext(gallivm
->context
,
980 s_bld
.type
.length
*s_bld
.type
.width
),
982 front_facing
= LLVMBuildBitCast(builder
, front_facing
,
983 s_bld
.int_vec_type
, "");
986 /* convert scalar stencil refs into vectors */
987 stencil_refs
[0] = lp_build_broadcast_scalar(&s_bld
, stencil_refs
[0]);
988 stencil_refs
[1] = lp_build_broadcast_scalar(&s_bld
, stencil_refs
[1]);
990 s_pass_mask
= lp_build_stencil_test(&s_bld
, stencil
,
991 stencil_refs
, stencil_vals
,
994 /* apply stencil-fail operator */
996 LLVMValueRef s_fail_mask
= lp_build_andnot(&s_bld
, orig_mask
, s_pass_mask
);
997 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, S_FAIL_OP
,
998 stencil_refs
, stencil_vals
,
999 s_fail_mask
, front_facing
);
1003 if (depth
->enabled
) {
1005 * Convert fragment Z to the desired type, aligning the LSB to the right.
1008 assert(z_type
.width
== z_src_type
.width
);
1009 assert(z_type
.length
== z_src_type
.length
);
1010 assert(lp_check_value(z_src_type
, z_src
));
1011 if (z_src_type
.floating
) {
1013 * Convert from floating point values
1016 if (!z_type
.floating
) {
1017 z_src
= lp_build_clamped_float_to_unsigned_norm(gallivm
,
1024 * Convert from unsigned normalized values.
1027 assert(!z_src_type
.sign
);
1028 assert(!z_src_type
.fixed
);
1029 assert(z_src_type
.norm
);
1030 assert(!z_type
.floating
);
1031 if (z_src_type
.width
> z_width
) {
1032 LLVMValueRef shift
= lp_build_const_int_vec(gallivm
, z_src_type
,
1033 z_src_type
.width
- z_width
);
1034 z_src
= LLVMBuildLShr(builder
, z_src
, shift
, "");
1037 assert(lp_check_value(z_type
, z_src
));
1039 lp_build_name(z_src
, "z_src");
1041 /* compare src Z to dst Z, returning 'pass' mask */
1042 z_pass
= lp_build_cmp(&z_bld
, depth
->func
, z_src
, z_dst
);
1044 if (!stencil
[0].enabled
) {
1045 /* We can potentially skip all remaining operations here, but only
1046 * if stencil is disabled because we still need to update the stencil
1047 * buffer values. Don't need to update Z buffer values.
1049 lp_build_mask_update(mask
, z_pass
);
1052 lp_build_mask_check(mask
);
1057 if (depth
->writemask
) {
1058 LLVMValueRef zselectmask
;
1060 /* mask off bits that failed Z test */
1061 zselectmask
= LLVMBuildAnd(builder
, orig_mask
, z_pass
, "");
1063 /* mask off bits that failed stencil test */
1065 zselectmask
= LLVMBuildAnd(builder
, zselectmask
, s_pass_mask
, "");
1068 /* Mix the old and new Z buffer values.
1069 * z_dst[i] = zselectmask[i] ? z_src[i] : z_dst[i]
1071 z_dst
= lp_build_select(&z_bld
, zselectmask
, z_src
, z_dst
);
1074 if (stencil
[0].enabled
) {
1075 /* update stencil buffer values according to z pass/fail result */
1076 LLVMValueRef z_fail_mask
, z_pass_mask
;
1078 /* apply Z-fail operator */
1079 z_fail_mask
= lp_build_andnot(&s_bld
, orig_mask
, z_pass
);
1080 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, Z_FAIL_OP
,
1081 stencil_refs
, stencil_vals
,
1082 z_fail_mask
, front_facing
);
1084 /* apply Z-pass operator */
1085 z_pass_mask
= LLVMBuildAnd(builder
, orig_mask
, z_pass
, "");
1086 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, Z_PASS_OP
,
1087 stencil_refs
, stencil_vals
,
1088 z_pass_mask
, front_facing
);
1092 /* No depth test: apply Z-pass operator to stencil buffer values which
1093 * passed the stencil test.
1095 s_pass_mask
= LLVMBuildAnd(builder
, orig_mask
, s_pass_mask
, "");
1096 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, Z_PASS_OP
,
1097 stencil_refs
, stencil_vals
,
1098 s_pass_mask
, front_facing
);
1101 /* Put Z and stencil bits in the right place */
1102 if (have_z
&& z_shift
) {
1103 LLVMValueRef shift
= lp_build_const_int_vec(gallivm
, z_type
, z_shift
);
1104 z_dst
= LLVMBuildShl(builder
, z_dst
, shift
, "");
1106 if (stencil_vals
&& stencil_shift
)
1107 stencil_vals
= LLVMBuildShl(builder
, stencil_vals
,
1110 /* Finally, merge the z/stencil values */
1111 if (format_desc
->block
.bits
<= 32) {
1112 if (have_z
&& have_s
)
1113 *z_value
= LLVMBuildOr(builder
, z_dst
, stencil_vals
, "");
1117 *z_value
= stencil_vals
;
1118 *s_value
= *z_value
;
1122 *s_value
= stencil_vals
;
1126 lp_build_mask_update(mask
, s_pass_mask
);
1128 if (depth
->enabled
&& stencil
[0].enabled
)
1129 lp_build_mask_update(mask
, z_pass
);