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.
432 * TODO: could get that out of the fs loop.
434 * \param type holds element type of the mask vector.
435 * \param maskvalue is the depth test mask.
436 * \param counter is a pointer of the uint32 counter.
439 lp_build_occlusion_count(struct gallivm_state
*gallivm
,
441 LLVMValueRef maskvalue
,
442 LLVMValueRef counter
)
444 LLVMBuilderRef builder
= gallivm
->builder
;
445 LLVMContextRef context
= gallivm
->context
;
446 LLVMValueRef countmask
= lp_build_const_int_vec(gallivm
, type
, 1);
447 LLVMValueRef count
, newcount
;
449 assert(type
.length
<= 16);
450 assert(type
.floating
);
452 if(util_cpu_caps
.has_sse
&& type
.length
== 4) {
453 const char *movmskintr
= "llvm.x86.sse.movmsk.ps";
454 const char *popcntintr
= "llvm.ctpop.i32";
455 LLVMValueRef bits
= LLVMBuildBitCast(builder
, maskvalue
,
456 lp_build_vec_type(gallivm
, type
), "");
457 bits
= lp_build_intrinsic_unary(builder
, movmskintr
,
458 LLVMInt32TypeInContext(context
), bits
);
459 count
= lp_build_intrinsic_unary(builder
, popcntintr
,
460 LLVMInt32TypeInContext(context
), bits
);
461 count
= LLVMBuildZExt(builder
, count
, LLVMIntTypeInContext(context
, 64), "");
463 else if(util_cpu_caps
.has_avx
&& type
.length
== 8) {
464 const char *movmskintr
= "llvm.x86.avx.movmsk.ps.256";
465 const char *popcntintr
= "llvm.ctpop.i32";
466 LLVMValueRef bits
= LLVMBuildBitCast(builder
, maskvalue
,
467 lp_build_vec_type(gallivm
, type
), "");
468 bits
= lp_build_intrinsic_unary(builder
, movmskintr
,
469 LLVMInt32TypeInContext(context
), bits
);
470 count
= lp_build_intrinsic_unary(builder
, popcntintr
,
471 LLVMInt32TypeInContext(context
), bits
);
472 count
= LLVMBuildZExt(builder
, count
, LLVMIntTypeInContext(context
, 64), "");
476 LLVMValueRef countv
= LLVMBuildAnd(builder
, maskvalue
, countmask
, "countv");
477 LLVMTypeRef counttype
= LLVMIntTypeInContext(context
, type
.length
* 8);
478 LLVMTypeRef i8vntype
= LLVMVectorType(LLVMInt8TypeInContext(context
), type
.length
* 4);
479 LLVMValueRef shufflev
, countd
;
480 LLVMValueRef shuffles
[16];
481 const char *popcntintr
= NULL
;
483 countv
= LLVMBuildBitCast(builder
, countv
, i8vntype
, "");
485 for (i
= 0; i
< type
.length
; i
++) {
486 shuffles
[i
] = lp_build_const_int32(gallivm
, 4*i
);
489 shufflev
= LLVMConstVector(shuffles
, type
.length
);
490 countd
= LLVMBuildShuffleVector(builder
, countv
, LLVMGetUndef(i8vntype
), shufflev
, "");
491 countd
= LLVMBuildBitCast(builder
, countd
, counttype
, "countd");
495 * this is bad on cpus without popcount (on x86 supported by intel
496 * nehalem, amd barcelona, and up - not tied to sse42).
497 * Would be much faster to just sum the 4 elements of the vector with
498 * some horizontal add (shuffle/add/shuffle/add after the initial and).
500 switch (type
.length
) {
502 popcntintr
= "llvm.ctpop.i32";
505 popcntintr
= "llvm.ctpop.i64";
508 popcntintr
= "llvm.ctpop.i128";
513 count
= lp_build_intrinsic_unary(builder
, popcntintr
, counttype
, countd
);
515 if (type
.length
> 8) {
516 count
= LLVMBuildTrunc(builder
, count
, LLVMIntTypeInContext(context
, 64), "");
518 else if (type
.length
< 8) {
519 count
= LLVMBuildZExt(builder
, count
, LLVMIntTypeInContext(context
, 64), "");
522 newcount
= LLVMBuildLoad(builder
, counter
, "origcount");
523 newcount
= LLVMBuildAdd(builder
, newcount
, count
, "newcount");
524 LLVMBuildStore(builder
, newcount
, counter
);
529 * Load depth/stencil values.
530 * The stored values are linear, swizzle them.
532 * \param type the data type of the fragment depth/stencil values
533 * \param format_desc description of the depth/stencil surface
534 * \param is_1d whether this resource has only one dimension
535 * \param loop_counter the current loop iteration
536 * \param depth_ptr pointer to the depth/stencil values of this 4x4 block
537 * \param depth_stride stride of the depth/stencil buffer
538 * \param z_fb contains z values loaded from fb (may include padding)
539 * \param s_fb contains s values loaded from fb (may include padding)
542 lp_build_depth_stencil_load_swizzled(struct gallivm_state
*gallivm
,
543 struct lp_type z_src_type
,
544 const struct util_format_description
*format_desc
,
546 LLVMValueRef depth_ptr
,
547 LLVMValueRef depth_stride
,
550 LLVMValueRef loop_counter
)
552 LLVMBuilderRef builder
= gallivm
->builder
;
553 LLVMValueRef shuffles
[LP_MAX_VECTOR_LENGTH
/ 4];
554 LLVMValueRef zs_dst1
, zs_dst2
;
555 LLVMValueRef zs_dst_ptr
;
556 LLVMValueRef depth_offset1
, depth_offset2
;
557 LLVMTypeRef load_ptr_type
;
558 unsigned depth_bytes
= format_desc
->block
.bits
/ 8;
559 struct lp_type zs_type
= lp_depth_type(format_desc
, z_src_type
.length
);
560 struct lp_type zs_load_type
= zs_type
;
562 zs_load_type
.length
= zs_load_type
.length
/ 2;
563 load_ptr_type
= LLVMPointerType(lp_build_vec_type(gallivm
, zs_load_type
), 0);
565 if (z_src_type
.length
== 4) {
567 LLVMValueRef looplsb
= LLVMBuildAnd(builder
, loop_counter
,
568 lp_build_const_int32(gallivm
, 1), "");
569 LLVMValueRef loopmsb
= LLVMBuildAnd(builder
, loop_counter
,
570 lp_build_const_int32(gallivm
, 2), "");
571 LLVMValueRef offset2
= LLVMBuildMul(builder
, loopmsb
,
573 depth_offset1
= LLVMBuildMul(builder
, looplsb
,
574 lp_build_const_int32(gallivm
, depth_bytes
* 2), "");
575 depth_offset1
= LLVMBuildAdd(builder
, depth_offset1
, offset2
, "");
577 /* just concatenate the loaded 2x2 values into 4-wide vector */
578 for (i
= 0; i
< 4; i
++) {
579 shuffles
[i
] = lp_build_const_int32(gallivm
, i
);
584 LLVMValueRef loopx2
= LLVMBuildShl(builder
, loop_counter
,
585 lp_build_const_int32(gallivm
, 1), "");
586 assert(z_src_type
.length
== 8);
587 depth_offset1
= LLVMBuildMul(builder
, loopx2
, depth_stride
, "");
589 * We load 2x4 values, and need to swizzle them (order
590 * 0,1,4,5,2,3,6,7) - not so hot with avx unfortunately.
592 for (i
= 0; i
< 8; i
++) {
593 shuffles
[i
] = lp_build_const_int32(gallivm
, (i
&1) + (i
&2) * 2 + (i
&4) / 2);
597 depth_offset2
= LLVMBuildAdd(builder
, depth_offset1
, depth_stride
, "");
599 /* Load current z/stencil values from z/stencil buffer */
600 zs_dst_ptr
= LLVMBuildGEP(builder
, depth_ptr
, &depth_offset1
, 1, "");
601 zs_dst_ptr
= LLVMBuildBitCast(builder
, zs_dst_ptr
, load_ptr_type
, "");
602 zs_dst1
= LLVMBuildLoad(builder
, zs_dst_ptr
, "");
604 zs_dst2
= lp_build_undef(gallivm
, zs_load_type
);
607 zs_dst_ptr
= LLVMBuildGEP(builder
, depth_ptr
, &depth_offset2
, 1, "");
608 zs_dst_ptr
= LLVMBuildBitCast(builder
, zs_dst_ptr
, load_ptr_type
, "");
609 zs_dst2
= LLVMBuildLoad(builder
, zs_dst_ptr
, "");
612 *z_fb
= LLVMBuildShuffleVector(builder
, zs_dst1
, zs_dst2
,
613 LLVMConstVector(shuffles
, zs_type
.length
), "");
616 if (format_desc
->block
.bits
< z_src_type
.width
) {
617 /* Extend destination ZS values (e.g., when reading from Z16_UNORM) */
618 *z_fb
= LLVMBuildZExt(builder
, *z_fb
,
619 lp_build_int_vec_type(gallivm
, z_src_type
), "");
622 else if (format_desc
->block
.bits
> 32) {
623 /* rely on llvm to handle too wide vector we have here nicely */
625 struct lp_type typex2
= zs_type
;
626 struct lp_type s_type
= zs_type
;
627 LLVMValueRef shuffles1
[LP_MAX_VECTOR_LENGTH
/ 4];
628 LLVMValueRef shuffles2
[LP_MAX_VECTOR_LENGTH
/ 4];
631 typex2
.width
= typex2
.width
/ 2;
632 typex2
.length
= typex2
.length
* 2;
633 s_type
.width
= s_type
.width
/ 2;
636 tmp
= LLVMBuildBitCast(builder
, *z_fb
,
637 lp_build_vec_type(gallivm
, typex2
), "");
639 for (i
= 0; i
< zs_type
.length
; i
++) {
640 shuffles1
[i
] = lp_build_const_int32(gallivm
, i
* 2);
641 shuffles2
[i
] = lp_build_const_int32(gallivm
, i
* 2 + 1);
643 *z_fb
= LLVMBuildShuffleVector(builder
, tmp
, tmp
,
644 LLVMConstVector(shuffles1
, zs_type
.length
), "");
645 *s_fb
= LLVMBuildShuffleVector(builder
, tmp
, tmp
,
646 LLVMConstVector(shuffles2
, zs_type
.length
), "");
647 *s_fb
= LLVMBuildBitCast(builder
, *s_fb
,
648 lp_build_vec_type(gallivm
, s_type
), "");
649 lp_build_name(*s_fb
, "s_dst");
652 lp_build_name(*z_fb
, "z_dst");
653 lp_build_name(*s_fb
, "s_dst");
654 lp_build_name(*z_fb
, "z_dst");
658 * Store depth/stencil values.
659 * Incoming values are swizzled (typically n 2x2 quads), stored linear.
660 * If there's a mask it will do select/store otherwise just store.
662 * \param type the data type of the fragment depth/stencil values
663 * \param format_desc description of the depth/stencil surface
664 * \param is_1d whether this resource has only one dimension
665 * \param mask the alive/dead pixel mask for the quad (vector)
666 * \param z_fb z values read from fb (with padding)
667 * \param s_fb s values read from fb (with padding)
668 * \param loop_counter the current loop iteration
669 * \param depth_ptr pointer to the depth/stencil values of this 4x4 block
670 * \param depth_stride stride of the depth/stencil buffer
671 * \param z_value the depth values to store (with padding)
672 * \param s_value the stencil values to store (with padding)
675 lp_build_depth_stencil_write_swizzled(struct gallivm_state
*gallivm
,
676 struct lp_type z_src_type
,
677 const struct util_format_description
*format_desc
,
679 struct lp_build_mask_context
*mask
,
682 LLVMValueRef loop_counter
,
683 LLVMValueRef depth_ptr
,
684 LLVMValueRef depth_stride
,
685 LLVMValueRef z_value
,
686 LLVMValueRef s_value
)
688 struct lp_build_context z_bld
;
689 LLVMValueRef shuffles
[LP_MAX_VECTOR_LENGTH
/ 4];
690 LLVMBuilderRef builder
= gallivm
->builder
;
691 LLVMValueRef mask_value
= NULL
;
692 LLVMValueRef zs_dst1
, zs_dst2
;
693 LLVMValueRef zs_dst_ptr1
, zs_dst_ptr2
;
694 LLVMValueRef depth_offset1
, depth_offset2
;
695 LLVMTypeRef load_ptr_type
;
696 unsigned depth_bytes
= format_desc
->block
.bits
/ 8;
697 struct lp_type zs_type
= lp_depth_type(format_desc
, z_src_type
.length
);
698 struct lp_type z_type
= zs_type
;
699 struct lp_type zs_load_type
= zs_type
;
701 zs_load_type
.length
= zs_load_type
.length
/ 2;
702 load_ptr_type
= LLVMPointerType(lp_build_vec_type(gallivm
, zs_load_type
), 0);
704 z_type
.width
= z_src_type
.width
;
706 lp_build_context_init(&z_bld
, gallivm
, z_type
);
709 * This is far from ideal, at least for late depth write we should do this
710 * outside the fs loop to avoid all the swizzle stuff.
712 if (z_src_type
.length
== 4) {
713 LLVMValueRef looplsb
= LLVMBuildAnd(builder
, loop_counter
,
714 lp_build_const_int32(gallivm
, 1), "");
715 LLVMValueRef loopmsb
= LLVMBuildAnd(builder
, loop_counter
,
716 lp_build_const_int32(gallivm
, 2), "");
717 LLVMValueRef offset2
= LLVMBuildMul(builder
, loopmsb
,
719 depth_offset1
= LLVMBuildMul(builder
, looplsb
,
720 lp_build_const_int32(gallivm
, depth_bytes
* 2), "");
721 depth_offset1
= LLVMBuildAdd(builder
, depth_offset1
, offset2
, "");
725 LLVMValueRef loopx2
= LLVMBuildShl(builder
, loop_counter
,
726 lp_build_const_int32(gallivm
, 1), "");
727 assert(z_src_type
.length
== 8);
728 depth_offset1
= LLVMBuildMul(builder
, loopx2
, depth_stride
, "");
730 * We load 2x4 values, and need to swizzle them (order
731 * 0,1,4,5,2,3,6,7) - not so hot with avx unfortunately.
733 for (i
= 0; i
< 8; i
++) {
734 shuffles
[i
] = lp_build_const_int32(gallivm
, (i
&1) + (i
&2) * 2 + (i
&4) / 2);
738 depth_offset2
= LLVMBuildAdd(builder
, depth_offset1
, depth_stride
, "");
740 zs_dst_ptr1
= LLVMBuildGEP(builder
, depth_ptr
, &depth_offset1
, 1, "");
741 zs_dst_ptr1
= LLVMBuildBitCast(builder
, zs_dst_ptr1
, load_ptr_type
, "");
742 zs_dst_ptr2
= LLVMBuildGEP(builder
, depth_ptr
, &depth_offset2
, 1, "");
743 zs_dst_ptr2
= LLVMBuildBitCast(builder
, zs_dst_ptr2
, load_ptr_type
, "");
745 if (format_desc
->block
.bits
> 32) {
746 s_value
= LLVMBuildBitCast(builder
, s_value
, z_bld
.vec_type
, "");
750 mask_value
= lp_build_mask_value(mask
);
751 z_value
= lp_build_select(&z_bld
, mask_value
, z_value
, z_fb
);
752 if (format_desc
->block
.bits
> 32) {
753 s_fb
= LLVMBuildBitCast(builder
, s_fb
, z_bld
.vec_type
, "");
754 s_value
= lp_build_select(&z_bld
, mask_value
, s_value
, s_fb
);
758 if (zs_type
.width
< z_src_type
.width
) {
759 /* Truncate ZS values (e.g., when writing to Z16_UNORM) */
760 z_value
= LLVMBuildTrunc(builder
, z_value
,
761 lp_build_int_vec_type(gallivm
, zs_type
), "");
764 if (format_desc
->block
.bits
<= 32) {
765 if (z_src_type
.length
== 4) {
766 zs_dst1
= lp_build_extract_range(gallivm
, z_value
, 0, 2);
767 zs_dst2
= lp_build_extract_range(gallivm
, z_value
, 2, 2);
770 assert(z_src_type
.length
== 8);
771 zs_dst1
= LLVMBuildShuffleVector(builder
, z_value
, z_value
,
772 LLVMConstVector(&shuffles
[0],
773 zs_load_type
.length
), "");
774 zs_dst2
= LLVMBuildShuffleVector(builder
, z_value
, z_value
,
775 LLVMConstVector(&shuffles
[4],
776 zs_load_type
.length
), "");
780 if (z_src_type
.length
== 4) {
781 zs_dst1
= lp_build_interleave2(gallivm
, z_type
,
782 z_value
, s_value
, 0);
783 zs_dst2
= lp_build_interleave2(gallivm
, z_type
,
784 z_value
, s_value
, 1);
788 LLVMValueRef shuffles
[LP_MAX_VECTOR_LENGTH
/ 2];
789 assert(z_src_type
.length
== 8);
790 for (i
= 0; i
< 8; i
++) {
791 shuffles
[i
*2] = lp_build_const_int32(gallivm
, (i
&1) + (i
&2) * 2 + (i
&4) / 2);
792 shuffles
[i
*2+1] = lp_build_const_int32(gallivm
, (i
&1) + (i
&2) * 2 + (i
&4) / 2 +
795 zs_dst1
= LLVMBuildShuffleVector(builder
, z_value
, s_value
,
796 LLVMConstVector(&shuffles
[0],
797 z_src_type
.length
), "");
798 zs_dst2
= LLVMBuildShuffleVector(builder
, z_value
, s_value
,
799 LLVMConstVector(&shuffles
[8],
800 z_src_type
.length
), "");
802 zs_dst1
= LLVMBuildBitCast(builder
, zs_dst1
,
803 lp_build_vec_type(gallivm
, zs_load_type
), "");
804 zs_dst2
= LLVMBuildBitCast(builder
, zs_dst2
,
805 lp_build_vec_type(gallivm
, zs_load_type
), "");
808 LLVMBuildStore(builder
, zs_dst1
, zs_dst_ptr1
);
810 LLVMBuildStore(builder
, zs_dst2
, zs_dst_ptr2
);
815 * Generate code for performing depth and/or stencil tests.
816 * We operate on a vector of values (typically n 2x2 quads).
818 * \param depth the depth test state
819 * \param stencil the front/back stencil state
820 * \param type the data type of the fragment depth/stencil values
821 * \param format_desc description of the depth/stencil surface
822 * \param mask the alive/dead pixel mask for the quad (vector)
823 * \param stencil_refs the front/back stencil ref values (scalar)
824 * \param z_src the incoming depth/stencil values (n 2x2 quad values, float32)
825 * \param zs_dst the depth/stencil values in framebuffer
826 * \param face contains boolean value indicating front/back facing polygon
829 lp_build_depth_stencil_test(struct gallivm_state
*gallivm
,
830 const struct pipe_depth_state
*depth
,
831 const struct pipe_stencil_state stencil
[2],
832 struct lp_type z_src_type
,
833 const struct util_format_description
*format_desc
,
834 struct lp_build_mask_context
*mask
,
835 LLVMValueRef stencil_refs
[2],
840 LLVMValueRef
*z_value
,
841 LLVMValueRef
*s_value
,
844 LLVMBuilderRef builder
= gallivm
->builder
;
845 struct lp_type z_type
;
846 struct lp_build_context z_bld
;
847 struct lp_build_context s_bld
;
848 struct lp_type s_type
;
849 unsigned z_shift
= 0, z_width
= 0, z_mask
= 0;
850 LLVMValueRef z_dst
= NULL
;
851 LLVMValueRef stencil_vals
= NULL
;
852 LLVMValueRef z_bitmask
= NULL
, stencil_shift
= NULL
;
853 LLVMValueRef z_pass
= NULL
, s_pass_mask
= NULL
;
854 LLVMValueRef orig_mask
= lp_build_mask_value(mask
);
855 LLVMValueRef front_facing
= NULL
;
856 boolean have_z
, have_s
;
859 * Depths are expected to be between 0 and 1, even if they are stored in
860 * floats. Setting these bits here will ensure that the lp_build_conv() call
861 * below won't try to unnecessarily clamp the incoming values.
863 if(z_src_type
.floating
) {
864 z_src_type
.sign
= FALSE
;
865 z_src_type
.norm
= TRUE
;
868 assert(!z_src_type
.sign
);
869 assert(z_src_type
.norm
);
872 /* Pick the type matching the depth-stencil format. */
873 z_type
= lp_depth_type(format_desc
, z_src_type
.length
);
875 /* Pick the intermediate type for depth operations. */
876 z_type
.width
= z_src_type
.width
;
877 assert(z_type
.length
== z_src_type
.length
);
879 /* FIXME: for non-float depth/stencil might generate better code
880 * if we'd always split it up to use 128bit operations.
881 * For stencil we'd almost certainly want to pack to 8xi16 values,
882 * for z just run twice.
885 /* Sanity checking */
887 const unsigned z_swizzle
= format_desc
->swizzle
[0];
888 const unsigned s_swizzle
= format_desc
->swizzle
[1];
890 assert(z_swizzle
!= UTIL_FORMAT_SWIZZLE_NONE
||
891 s_swizzle
!= UTIL_FORMAT_SWIZZLE_NONE
);
893 assert(depth
->enabled
|| stencil
[0].enabled
);
895 assert(format_desc
->colorspace
== UTIL_FORMAT_COLORSPACE_ZS
);
896 assert(format_desc
->block
.width
== 1);
897 assert(format_desc
->block
.height
== 1);
899 if (stencil
[0].enabled
) {
900 assert(s_swizzle
< 4);
901 assert(format_desc
->channel
[s_swizzle
].type
== UTIL_FORMAT_TYPE_UNSIGNED
);
902 assert(format_desc
->channel
[s_swizzle
].pure_integer
);
903 assert(!format_desc
->channel
[s_swizzle
].normalized
);
904 assert(format_desc
->channel
[s_swizzle
].size
== 8);
907 if (depth
->enabled
) {
908 assert(z_swizzle
< 4);
909 if (z_type
.floating
) {
910 assert(z_swizzle
== 0);
911 assert(format_desc
->channel
[z_swizzle
].type
==
912 UTIL_FORMAT_TYPE_FLOAT
);
913 assert(format_desc
->channel
[z_swizzle
].size
== 32);
916 assert(format_desc
->channel
[z_swizzle
].type
==
917 UTIL_FORMAT_TYPE_UNSIGNED
);
918 assert(format_desc
->channel
[z_swizzle
].normalized
);
919 assert(!z_type
.fixed
);
925 /* Setup build context for Z vals */
926 lp_build_context_init(&z_bld
, gallivm
, z_type
);
928 /* Setup build context for stencil vals */
929 s_type
= lp_int_type(z_type
);
930 lp_build_context_init(&s_bld
, gallivm
, s_type
);
932 /* Compute and apply the Z/stencil bitmasks and shifts.
935 unsigned s_shift
, s_mask
;
940 have_z
= get_z_shift_and_mask(format_desc
, &z_shift
, &z_width
, &z_mask
);
941 have_s
= get_s_shift_and_mask(format_desc
, &s_shift
, &s_mask
);
944 if (z_mask
!= 0xffffffff) {
945 z_bitmask
= lp_build_const_int_vec(gallivm
, z_type
, z_mask
);
949 * Align the framebuffer Z 's LSB to the right.
952 LLVMValueRef shift
= lp_build_const_int_vec(gallivm
, z_type
, z_shift
);
953 z_dst
= LLVMBuildLShr(builder
, z_dst
, shift
, "z_dst");
954 } else if (z_bitmask
) {
955 z_dst
= LLVMBuildAnd(builder
, z_dst
, z_bitmask
, "z_dst");
957 lp_build_name(z_dst
, "z_dst");
963 LLVMValueRef shift
= lp_build_const_int_vec(gallivm
, s_type
, s_shift
);
964 stencil_vals
= LLVMBuildLShr(builder
, stencil_vals
, shift
, "");
965 stencil_shift
= shift
; /* used below */
968 if (s_mask
!= 0xffffffff) {
969 LLVMValueRef mask
= lp_build_const_int_vec(gallivm
, s_type
, s_mask
);
970 stencil_vals
= LLVMBuildAnd(builder
, stencil_vals
, mask
, "");
973 lp_build_name(stencil_vals
, "s_dst");
977 if (stencil
[0].enabled
) {
980 LLVMValueRef zero
= lp_build_const_int32(gallivm
, 0);
982 /* front_facing = face != 0 ? ~0 : 0 */
983 front_facing
= LLVMBuildICmp(builder
, LLVMIntNE
, face
, zero
, "");
984 front_facing
= LLVMBuildSExt(builder
, front_facing
,
985 LLVMIntTypeInContext(gallivm
->context
,
986 s_bld
.type
.length
*s_bld
.type
.width
),
988 front_facing
= LLVMBuildBitCast(builder
, front_facing
,
989 s_bld
.int_vec_type
, "");
992 /* convert scalar stencil refs into vectors */
993 stencil_refs
[0] = lp_build_broadcast_scalar(&s_bld
, stencil_refs
[0]);
994 stencil_refs
[1] = lp_build_broadcast_scalar(&s_bld
, stencil_refs
[1]);
996 s_pass_mask
= lp_build_stencil_test(&s_bld
, stencil
,
997 stencil_refs
, stencil_vals
,
1000 /* apply stencil-fail operator */
1002 LLVMValueRef s_fail_mask
= lp_build_andnot(&s_bld
, orig_mask
, s_pass_mask
);
1003 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, S_FAIL_OP
,
1004 stencil_refs
, stencil_vals
,
1005 s_fail_mask
, front_facing
);
1009 if (depth
->enabled
) {
1011 * Convert fragment Z to the desired type, aligning the LSB to the right.
1014 assert(z_type
.width
== z_src_type
.width
);
1015 assert(z_type
.length
== z_src_type
.length
);
1016 assert(lp_check_value(z_src_type
, z_src
));
1017 if (z_src_type
.floating
) {
1019 * Convert from floating point values
1022 if (!z_type
.floating
) {
1023 z_src
= lp_build_clamped_float_to_unsigned_norm(gallivm
,
1030 * Convert from unsigned normalized values.
1033 assert(!z_src_type
.sign
);
1034 assert(!z_src_type
.fixed
);
1035 assert(z_src_type
.norm
);
1036 assert(!z_type
.floating
);
1037 if (z_src_type
.width
> z_width
) {
1038 LLVMValueRef shift
= lp_build_const_int_vec(gallivm
, z_src_type
,
1039 z_src_type
.width
- z_width
);
1040 z_src
= LLVMBuildLShr(builder
, z_src
, shift
, "");
1043 assert(lp_check_value(z_type
, z_src
));
1045 lp_build_name(z_src
, "z_src");
1047 /* compare src Z to dst Z, returning 'pass' mask */
1048 z_pass
= lp_build_cmp(&z_bld
, depth
->func
, z_src
, z_dst
);
1050 if (!stencil
[0].enabled
) {
1051 /* We can potentially skip all remaining operations here, but only
1052 * if stencil is disabled because we still need to update the stencil
1053 * buffer values. Don't need to update Z buffer values.
1055 lp_build_mask_update(mask
, z_pass
);
1058 lp_build_mask_check(mask
);
1063 if (depth
->writemask
) {
1064 LLVMValueRef zselectmask
;
1066 /* mask off bits that failed Z test */
1067 zselectmask
= LLVMBuildAnd(builder
, orig_mask
, z_pass
, "");
1069 /* mask off bits that failed stencil test */
1071 zselectmask
= LLVMBuildAnd(builder
, zselectmask
, s_pass_mask
, "");
1074 /* Mix the old and new Z buffer values.
1075 * z_dst[i] = zselectmask[i] ? z_src[i] : z_dst[i]
1077 z_dst
= lp_build_select(&z_bld
, zselectmask
, z_src
, z_dst
);
1080 if (stencil
[0].enabled
) {
1081 /* update stencil buffer values according to z pass/fail result */
1082 LLVMValueRef z_fail_mask
, z_pass_mask
;
1084 /* apply Z-fail operator */
1085 z_fail_mask
= lp_build_andnot(&s_bld
, orig_mask
, z_pass
);
1086 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, Z_FAIL_OP
,
1087 stencil_refs
, stencil_vals
,
1088 z_fail_mask
, front_facing
);
1090 /* apply Z-pass operator */
1091 z_pass_mask
= LLVMBuildAnd(builder
, orig_mask
, z_pass
, "");
1092 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, Z_PASS_OP
,
1093 stencil_refs
, stencil_vals
,
1094 z_pass_mask
, front_facing
);
1098 /* No depth test: apply Z-pass operator to stencil buffer values which
1099 * passed the stencil test.
1101 s_pass_mask
= LLVMBuildAnd(builder
, orig_mask
, s_pass_mask
, "");
1102 stencil_vals
= lp_build_stencil_op(&s_bld
, stencil
, Z_PASS_OP
,
1103 stencil_refs
, stencil_vals
,
1104 s_pass_mask
, front_facing
);
1107 /* Put Z and stencil bits in the right place */
1108 if (have_z
&& z_shift
) {
1109 LLVMValueRef shift
= lp_build_const_int_vec(gallivm
, z_type
, z_shift
);
1110 z_dst
= LLVMBuildShl(builder
, z_dst
, shift
, "");
1112 if (stencil_vals
&& stencil_shift
)
1113 stencil_vals
= LLVMBuildShl(builder
, stencil_vals
,
1116 /* Finally, merge the z/stencil values */
1117 if (format_desc
->block
.bits
<= 32) {
1118 if (have_z
&& have_s
)
1119 *z_value
= LLVMBuildOr(builder
, z_dst
, stencil_vals
, "");
1123 *z_value
= stencil_vals
;
1124 *s_value
= *z_value
;
1128 *s_value
= stencil_vals
;
1132 lp_build_mask_update(mask
, s_pass_mask
);
1134 if (depth
->enabled
&& stencil
[0].enabled
)
1135 lp_build_mask_update(mask
, z_pass
);