lp_bld_depth.c revision 0a1c9001037a13b69b157994e7983aa3dee158d3
1/************************************************************************** 2 * 3 * Copyright 2009-2010 VMware, Inc. 4 * All Rights Reserved. 5 * 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: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 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. 25 * 26 **************************************************************************/ 27 28/** 29 * @file 30 * Depth/stencil testing to LLVM IR translation. 31 * 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 37 * artifacts. 38 * 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 42 * 43 * Z11 Z12 Z13 Z14 ... 44 * Z21 Z22 Z23 Z24 ... 45 * Z31 Z32 Z33 Z34 ... 46 * Z41 Z42 Z43 Z44 ... 47 * ... ... ... ... ... 48 * 49 * will actually be stored in memory as 50 * 51 * Z11 Z12 Z21 Z22 Z13 Z14 Z23 Z24 ... 52 * Z31 Z32 Z41 Z42 Z33 Z34 Z43 Z44 ... 53 * ... ... ... ... ... ... ... ... ... 54 * 55 * 56 * @author Jose Fonseca <jfonseca@vmware.com> 57 * @author Brian Paul <jfonseca@vmware.com> 58 */ 59 60#include "pipe/p_state.h" 61#include "util/u_format.h" 62 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" 73 74#include "lp_bld_depth.h" 75 76 77/** Used to select fields from pipe_stencil_state */ 78enum stencil_op { 79 S_FAIL_OP, 80 Z_FAIL_OP, 81 Z_PASS_OP 82}; 83 84 85 86/** 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) 93 */ 94static LLVMValueRef 95lp_build_stencil_test_single(struct lp_build_context *bld, 96 const struct pipe_stencil_state *stencil, 97 LLVMValueRef stencilRef, 98 LLVMValueRef stencilVals) 99{ 100 const unsigned stencilMax = 255; /* XXX fix */ 101 struct lp_type type = bld->type; 102 LLVMValueRef res; 103 104 assert(type.sign); 105 106 assert(stencil->enabled); 107 108 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, ""); 114 } 115 116 res = lp_build_cmp(bld, stencil->func, stencilRef, stencilVals); 117 118 return res; 119} 120 121 122/** 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. 127 */ 128static LLVMValueRef 129lp_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) 134{ 135 LLVMValueRef res; 136 137 assert(stencil[0].enabled); 138 139 /* do front face test */ 140 res = lp_build_stencil_test_single(bld, &stencil[0], 141 stencilRefs[0], stencilVals); 142 143 if (stencil[1].enabled && front_facing) { 144 /* do back face test */ 145 LLVMValueRef back_res; 146 147 back_res = lp_build_stencil_test_single(bld, &stencil[1], 148 stencilRefs[1], stencilVals); 149 150 res = lp_build_select(bld, front_facing, res, back_res); 151 } 152 153 return res; 154} 155 156 157/** 158 * Apply the stencil operator (add/sub/keep/etc) to the given vector 159 * of stencil values. 160 * \return new stencil values vector 161 */ 162static LLVMValueRef 163lp_build_stencil_op_single(struct lp_build_context *bld, 164 const struct pipe_stencil_state *stencil, 165 enum stencil_op op, 166 LLVMValueRef stencilRef, 167 LLVMValueRef stencilVals) 168 169{ 170 struct lp_type type = bld->type; 171 LLVMValueRef res; 172 LLVMValueRef max = lp_build_const_int_vec(type, 0xff); 173 unsigned stencil_op; 174 175 assert(type.sign); 176 177 switch (op) { 178 case S_FAIL_OP: 179 stencil_op = stencil->fail_op; 180 break; 181 case Z_FAIL_OP: 182 stencil_op = stencil->zfail_op; 183 break; 184 case Z_PASS_OP: 185 stencil_op = stencil->zpass_op; 186 break; 187 default: 188 assert(0 && "Invalid stencil_op mode"); 189 stencil_op = PIPE_STENCIL_OP_KEEP; 190 } 191 192 switch (stencil_op) { 193 case PIPE_STENCIL_OP_KEEP: 194 res = stencilVals; 195 /* we can return early for this case */ 196 return res; 197 case PIPE_STENCIL_OP_ZERO: 198 res = bld->zero; 199 break; 200 case PIPE_STENCIL_OP_REPLACE: 201 res = stencilRef; 202 break; 203 case PIPE_STENCIL_OP_INCR: 204 res = lp_build_add(bld, stencilVals, bld->one); 205 res = lp_build_min(bld, res, max); 206 break; 207 case PIPE_STENCIL_OP_DECR: 208 res = lp_build_sub(bld, stencilVals, bld->one); 209 res = lp_build_max(bld, res, bld->zero); 210 break; 211 case PIPE_STENCIL_OP_INCR_WRAP: 212 res = lp_build_add(bld, stencilVals, bld->one); 213 res = LLVMBuildAnd(bld->builder, res, max, ""); 214 break; 215 case PIPE_STENCIL_OP_DECR_WRAP: 216 res = lp_build_sub(bld, stencilVals, bld->one); 217 res = LLVMBuildAnd(bld->builder, res, max, ""); 218 break; 219 case PIPE_STENCIL_OP_INVERT: 220 res = LLVMBuildNot(bld->builder, stencilVals, ""); 221 res = LLVMBuildAnd(bld->builder, res, max, ""); 222 break; 223 default: 224 assert(0 && "bad stencil op mode"); 225 res = bld->undef; 226 } 227 228 return res; 229} 230 231 232/** 233 * Do the one or two-sided stencil test op/update. 234 */ 235static LLVMValueRef 236lp_build_stencil_op(struct lp_build_context *bld, 237 const struct pipe_stencil_state stencil[2], 238 enum stencil_op op, 239 LLVMValueRef stencilRefs[2], 240 LLVMValueRef stencilVals, 241 LLVMValueRef mask, 242 LLVMValueRef front_facing) 243 244{ 245 LLVMValueRef res; 246 247 assert(stencil[0].enabled); 248 249 /* do front face op */ 250 res = lp_build_stencil_op_single(bld, &stencil[0], op, 251 stencilRefs[0], stencilVals); 252 253 if (stencil[1].enabled && front_facing) { 254 /* do back face op */ 255 LLVMValueRef back_res; 256 257 back_res = lp_build_stencil_op_single(bld, &stencil[1], op, 258 stencilRefs[1], stencilVals); 259 260 res = lp_build_select(bld, front_facing, res, back_res); 261 } 262 263 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); 269 } 270 else { 271 /* res = mask ? res : stencilVals */ 272 res = lp_build_select(bld, mask, res, stencilVals); 273 } 274 275 return res; 276} 277 278 279 280/** 281 * Return a type appropriate for depth/stencil testing. 282 */ 283struct lp_type 284lp_depth_type(const struct util_format_description *format_desc, 285 unsigned length) 286{ 287 struct lp_type type; 288 unsigned swizzle; 289 290 assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS); 291 assert(format_desc->block.width == 1); 292 assert(format_desc->block.height == 1); 293 294 swizzle = format_desc->swizzle[0]; 295 assert(swizzle < 4); 296 297 memset(&type, 0, sizeof type); 298 type.width = format_desc->block.bits; 299 300 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); 304 } 305 else if(format_desc->channel[swizzle].type == UTIL_FORMAT_TYPE_UNSIGNED) { 306 assert(format_desc->block.bits <= 32); 307 assert(format_desc->channel[swizzle].normalized); 308 if (format_desc->channel[swizzle].size < format_desc->block.bits) { 309 /* Prefer signed integers when possible, as SSE has less support 310 * for unsigned comparison; 311 */ 312 type.sign = TRUE; 313 } 314 } 315 else 316 assert(0); 317 318 assert(type.width <= length); 319 type.length = length / type.width; 320 321 return type; 322} 323 324 325/** 326 * Compute bitmask and bit shift to apply to the incoming fragment Z values 327 * and the Z buffer values needed before doing the Z comparison. 328 * 329 * Note that we leave the Z bits in the position that we find them 330 * in the Z buffer (typically 0xffffff00 or 0x00ffffff). That lets us 331 * get by with fewer bit twiddling steps. 332 */ 333static void 334get_z_shift_and_mask(const struct util_format_description *format_desc, 335 unsigned *shift, unsigned *width, unsigned *mask) 336{ 337 const unsigned total_bits = format_desc->block.bits; 338 unsigned z_swizzle; 339 unsigned chan; 340 unsigned padding_left, padding_right; 341 342 assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS); 343 assert(format_desc->block.width == 1); 344 assert(format_desc->block.height == 1); 345 346 z_swizzle = format_desc->swizzle[0]; 347 348 assert(z_swizzle != UTIL_FORMAT_SWIZZLE_NONE); 349 350 *width = format_desc->channel[z_swizzle].size; 351 352 padding_right = 0; 353 for (chan = 0; chan < z_swizzle; ++chan) 354 padding_right += format_desc->channel[chan].size; 355 356 padding_left = 357 total_bits - (padding_right + *width); 358 359 if (padding_left || padding_right) { 360 unsigned long long mask_left = (1ULL << (total_bits - padding_left)) - 1; 361 unsigned long long mask_right = (1ULL << (padding_right)) - 1; 362 *mask = mask_left ^ mask_right; 363 } 364 else { 365 *mask = 0xffffffff; 366 } 367 368 *shift = padding_right; 369} 370 371 372/** 373 * Compute bitmask and bit shift to apply to the framebuffer pixel values 374 * to put the stencil bits in the least significant position. 375 * (i.e. 0x000000ff) 376 */ 377static boolean 378get_s_shift_and_mask(const struct util_format_description *format_desc, 379 unsigned *shift, unsigned *mask) 380{ 381 unsigned s_swizzle; 382 unsigned chan, sz; 383 384 s_swizzle = format_desc->swizzle[1]; 385 386 if (s_swizzle == UTIL_FORMAT_SWIZZLE_NONE) 387 return FALSE; 388 389 *shift = 0; 390 for (chan = 0; chan < s_swizzle; chan++) 391 *shift += format_desc->channel[chan].size; 392 393 sz = format_desc->channel[s_swizzle].size; 394 *mask = (1U << sz) - 1U; 395 396 return TRUE; 397} 398 399 400/** 401 * Perform the occlusion test and increase the counter. 402 * Test the depth mask. Add the number of channel which has none zero mask 403 * into the occlusion counter. e.g. maskvalue is {-1, -1, -1, -1}. 404 * The counter will add 4. 405 * 406 * \param type holds element type of the mask vector. 407 * \param maskvalue is the depth test mask. 408 * \param counter is a pointer of the uint32 counter. 409 */ 410void 411lp_build_occlusion_count(LLVMBuilderRef builder, 412 struct lp_type type, 413 LLVMValueRef maskvalue, 414 LLVMValueRef counter) 415{ 416 LLVMValueRef countmask = lp_build_const_int_vec(type, 1); 417 LLVMValueRef countv = LLVMBuildAnd(builder, maskvalue, countmask, "countv"); 418 LLVMTypeRef i8v16 = LLVMVectorType(LLVMInt8Type(), 16); 419 LLVMValueRef counti = LLVMBuildBitCast(builder, countv, i8v16, "counti"); 420 LLVMValueRef maskarray[4] = { 421 LLVMConstInt(LLVMInt32Type(), 0, 0), 422 LLVMConstInt(LLVMInt32Type(), 4, 0), 423 LLVMConstInt(LLVMInt32Type(), 8, 0), 424 LLVMConstInt(LLVMInt32Type(), 12, 0), 425 }; 426 LLVMValueRef shufflemask = LLVMConstVector(maskarray, 4); 427 LLVMValueRef shufflev = LLVMBuildShuffleVector(builder, counti, LLVMGetUndef(i8v16), shufflemask, "shufflev"); 428 LLVMValueRef shuffle = LLVMBuildBitCast(builder, shufflev, LLVMInt32Type(), "shuffle"); 429 LLVMValueRef count = lp_build_intrinsic_unary(builder, "llvm.ctpop.i32", LLVMInt32Type(), shuffle); 430 LLVMValueRef orig = LLVMBuildLoad(builder, counter, "orig"); 431 LLVMValueRef incr = LLVMBuildAdd(builder, orig, count, "incr"); 432 LLVMBuildStore(builder, incr, counter); 433} 434 435 436 437/** 438 * Generate code for performing depth and/or stencil tests. 439 * We operate on a vector of values (typically a 2x2 quad). 440 * 441 * \param depth the depth test state 442 * \param stencil the front/back stencil state 443 * \param type the data type of the fragment depth/stencil values 444 * \param format_desc description of the depth/stencil surface 445 * \param mask the alive/dead pixel mask for the quad (vector) 446 * \param stencil_refs the front/back stencil ref values (scalar) 447 * \param z_src the incoming depth/stencil values (a 2x2 quad, float32) 448 * \param zs_dst_ptr pointer to depth/stencil values in framebuffer 449 * \param facing contains boolean value indicating front/back facing polygon 450 */ 451void 452lp_build_depth_stencil_test(LLVMBuilderRef builder, 453 const struct pipe_depth_state *depth, 454 const struct pipe_stencil_state stencil[2], 455 struct lp_type z_src_type, 456 const struct util_format_description *format_desc, 457 struct lp_build_mask_context *mask, 458 LLVMValueRef stencil_refs[2], 459 LLVMValueRef z_src, 460 LLVMValueRef zs_dst_ptr, 461 LLVMValueRef face, 462 LLVMValueRef *zs_value, 463 boolean do_branch) 464{ 465 struct lp_type z_type; 466 struct lp_build_context z_bld; 467 struct lp_build_context s_bld; 468 struct lp_type s_type; 469 unsigned z_shift, z_width, z_mask; 470 LLVMValueRef zs_dst, z_dst = NULL; 471 LLVMValueRef stencil_vals = NULL; 472 LLVMValueRef z_bitmask = NULL, stencil_shift = NULL; 473 LLVMValueRef z_pass = NULL, s_pass_mask = NULL; 474 LLVMValueRef orig_mask = lp_build_mask_value(mask); 475 LLVMValueRef front_facing = NULL; 476 477 478 /* 479 * Depths are expected to be between 0 and 1, even if they are stored in 480 * floats. Setting these bits here will ensure that the lp_build_conv() call 481 * below won't try to unnecessarily clamp the incoming values. 482 */ 483 if(z_src_type.floating) { 484 z_src_type.sign = FALSE; 485 z_src_type.norm = TRUE; 486 } 487 else { 488 assert(!z_src_type.sign); 489 assert(z_src_type.norm); 490 } 491 492 /* Pick the depth type. */ 493 z_type = lp_depth_type(format_desc, z_src_type.width*z_src_type.length); 494 495 /* FIXME: Cope with a depth test type with a different bit width. */ 496 assert(z_type.width == z_src_type.width); 497 assert(z_type.length == z_src_type.length); 498 499 /* Sanity checking */ 500 { 501 const unsigned z_swizzle = format_desc->swizzle[0]; 502 const unsigned s_swizzle = format_desc->swizzle[1]; 503 504 assert(z_swizzle != UTIL_FORMAT_SWIZZLE_NONE || 505 s_swizzle != UTIL_FORMAT_SWIZZLE_NONE); 506 507 assert(depth->enabled || stencil[0].enabled); 508 509 assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS); 510 assert(format_desc->block.width == 1); 511 assert(format_desc->block.height == 1); 512 513 if (stencil[0].enabled) { 514 assert(format_desc->format == PIPE_FORMAT_Z24_UNORM_S8_USCALED || 515 format_desc->format == PIPE_FORMAT_S8_USCALED_Z24_UNORM); 516 } 517 518 assert(z_swizzle < 4); 519 assert(format_desc->block.bits == z_type.width); 520 if (z_type.floating) { 521 assert(z_swizzle == 0); 522 assert(format_desc->channel[z_swizzle].type == 523 UTIL_FORMAT_TYPE_FLOAT); 524 assert(format_desc->channel[z_swizzle].size == 525 format_desc->block.bits); 526 } 527 else { 528 assert(format_desc->channel[z_swizzle].type == 529 UTIL_FORMAT_TYPE_UNSIGNED); 530 assert(format_desc->channel[z_swizzle].normalized); 531 assert(!z_type.fixed); 532 } 533 } 534 535 536 /* Setup build context for Z vals */ 537 lp_build_context_init(&z_bld, builder, z_type); 538 539 /* Setup build context for stencil vals */ 540 s_type = lp_type_int_vec(z_type.width); 541 lp_build_context_init(&s_bld, builder, s_type); 542 543 /* Load current z/stencil value from z/stencil buffer */ 544 zs_dst_ptr = LLVMBuildBitCast(builder, 545 zs_dst_ptr, 546 LLVMPointerType(z_bld.vec_type, 0), ""); 547 zs_dst = LLVMBuildLoad(builder, zs_dst_ptr, ""); 548 549 lp_build_name(zs_dst, "zs_dst"); 550 551 552 /* Compute and apply the Z/stencil bitmasks and shifts. 553 */ 554 { 555 unsigned s_shift, s_mask; 556 557 if (get_s_shift_and_mask(format_desc, &s_shift, &s_mask)) { 558 if (s_shift) { 559 LLVMValueRef shift = lp_build_const_int_vec(s_type, s_shift); 560 stencil_vals = LLVMBuildLShr(builder, zs_dst, shift, ""); 561 stencil_shift = shift; /* used below */ 562 } 563 else { 564 stencil_vals = zs_dst; 565 } 566 567 if (s_mask != 0xffffffff) { 568 LLVMValueRef mask = lp_build_const_int_vec(s_type, s_mask); 569 stencil_vals = LLVMBuildAnd(builder, stencil_vals, mask, ""); 570 } 571 572 lp_build_name(stencil_vals, "s_dst"); 573 } 574 } 575 576 if (stencil[0].enabled) { 577 578 if (face) { 579 LLVMValueRef zero = LLVMConstInt(LLVMInt32Type(), 0, 0); 580 581 /* front_facing = face != 0 ? ~0 : 0 */ 582 front_facing = LLVMBuildICmp(builder, LLVMIntNE, face, zero, ""); 583 front_facing = LLVMBuildSExt(builder, front_facing, 584 LLVMIntType(s_bld.type.length*s_bld.type.width), 585 ""); 586 front_facing = LLVMBuildBitCast(builder, front_facing, 587 s_bld.int_vec_type, ""); 588 } 589 590 /* convert scalar stencil refs into vectors */ 591 stencil_refs[0] = lp_build_broadcast_scalar(&s_bld, stencil_refs[0]); 592 stencil_refs[1] = lp_build_broadcast_scalar(&s_bld, stencil_refs[1]); 593 594 s_pass_mask = lp_build_stencil_test(&s_bld, stencil, 595 stencil_refs, stencil_vals, 596 front_facing); 597 598 /* apply stencil-fail operator */ 599 { 600 LLVMValueRef s_fail_mask = lp_build_andnot(&s_bld, orig_mask, s_pass_mask); 601 stencil_vals = lp_build_stencil_op(&s_bld, stencil, S_FAIL_OP, 602 stencil_refs, stencil_vals, 603 s_fail_mask, front_facing); 604 } 605 } 606 607 if (depth->enabled) { 608 get_z_shift_and_mask(format_desc, &z_shift, &z_width, &z_mask); 609 610 /* 611 * Convert fragment Z to the desired type, aligning the LSB to the right. 612 */ 613 614 assert(z_type.width == z_src_type.width); 615 assert(z_type.length == z_src_type.length); 616 assert(lp_check_value(z_src_type, z_src)); 617 if (z_src_type.floating) { 618 /* 619 * Convert from floating point values 620 */ 621 622 if (!z_type.floating) { 623 z_src = lp_build_clamped_float_to_unsigned_norm(builder, 624 z_src_type, 625 z_width, 626 z_src); 627 } 628 } else { 629 /* 630 * Convert from unsigned normalized values. 631 */ 632 633 assert(!z_src_type.sign); 634 assert(!z_src_type.fixed); 635 assert(z_src_type.norm); 636 assert(!z_type.floating); 637 if (z_src_type.width > z_width) { 638 LLVMValueRef shift = lp_build_const_int_vec(z_src_type, 639 z_src_type.width - z_width); 640 z_src = LLVMBuildLShr(builder, z_src, shift, ""); 641 } 642 } 643 assert(lp_check_value(z_type, z_src)); 644 645 lp_build_name(z_src, "z_src"); 646 647 if (z_mask != 0xffffffff) { 648 z_bitmask = lp_build_const_int_vec(z_type, z_mask); 649 } 650 651 /* 652 * Align the framebuffer Z 's LSB to the right. 653 */ 654 if (z_shift) { 655 LLVMValueRef shift = lp_build_const_int_vec(z_type, z_shift); 656 z_dst = LLVMBuildLShr(builder, zs_dst, shift, "z_dst"); 657 } else if (z_bitmask) { 658 z_dst = LLVMBuildAnd(builder, zs_dst, z_bitmask, "z_dst"); 659 } else { 660 z_dst = zs_dst; 661 lp_build_name(z_dst, "z_dst"); 662 } 663 664 /* compare src Z to dst Z, returning 'pass' mask */ 665 z_pass = lp_build_cmp(&z_bld, depth->func, z_src, z_dst); 666 667 if (!stencil[0].enabled) { 668 /* We can potentially skip all remaining operations here, but only 669 * if stencil is disabled because we still need to update the stencil 670 * buffer values. Don't need to update Z buffer values. 671 */ 672 lp_build_mask_update(mask, z_pass); 673 674 if (do_branch) { 675 lp_build_mask_check(mask); 676 do_branch = FALSE; 677 } 678 } 679 680 if (depth->writemask) { 681 LLVMValueRef zselectmask; 682 683 /* mask off bits that failed Z test */ 684 zselectmask = LLVMBuildAnd(builder, orig_mask, z_pass, ""); 685 686 /* mask off bits that failed stencil test */ 687 if (s_pass_mask) { 688 zselectmask = LLVMBuildAnd(builder, zselectmask, s_pass_mask, ""); 689 } 690 691 /* Mix the old and new Z buffer values. 692 * z_dst[i] = zselectmask[i] ? z_src[i] : z_dst[i] 693 */ 694 z_dst = lp_build_select(&z_bld, zselectmask, z_src, z_dst); 695 } 696 697 if (stencil[0].enabled) { 698 /* update stencil buffer values according to z pass/fail result */ 699 LLVMValueRef z_fail_mask, z_pass_mask; 700 701 /* apply Z-fail operator */ 702 z_fail_mask = lp_build_andnot(&z_bld, orig_mask, z_pass); 703 stencil_vals = lp_build_stencil_op(&s_bld, stencil, Z_FAIL_OP, 704 stencil_refs, stencil_vals, 705 z_fail_mask, front_facing); 706 707 /* apply Z-pass operator */ 708 z_pass_mask = LLVMBuildAnd(z_bld.builder, orig_mask, z_pass, ""); 709 stencil_vals = lp_build_stencil_op(&s_bld, stencil, Z_PASS_OP, 710 stencil_refs, stencil_vals, 711 z_pass_mask, front_facing); 712 } 713 } 714 else { 715 /* No depth test: apply Z-pass operator to stencil buffer values which 716 * passed the stencil test. 717 */ 718 s_pass_mask = LLVMBuildAnd(s_bld.builder, orig_mask, s_pass_mask, ""); 719 stencil_vals = lp_build_stencil_op(&s_bld, stencil, Z_PASS_OP, 720 stencil_refs, stencil_vals, 721 s_pass_mask, front_facing); 722 } 723 724 /* Put Z and ztencil bits in the right place */ 725 if (z_dst && z_shift) { 726 LLVMValueRef shift = lp_build_const_int_vec(z_type, z_shift); 727 z_dst = LLVMBuildShl(builder, z_dst, shift, ""); 728 } 729 if (stencil_vals && stencil_shift) 730 stencil_vals = LLVMBuildShl(s_bld.builder, stencil_vals, 731 stencil_shift, ""); 732 733 /* Finally, merge/store the z/stencil values */ 734 if ((depth->enabled && depth->writemask) || 735 (stencil[0].enabled && stencil[0].writemask)) { 736 737 if (z_dst && stencil_vals) 738 zs_dst = LLVMBuildOr(z_bld.builder, z_dst, stencil_vals, ""); 739 else if (z_dst) 740 zs_dst = z_dst; 741 else 742 zs_dst = stencil_vals; 743 744 *zs_value = zs_dst; 745 } 746 747 if (s_pass_mask) 748 lp_build_mask_update(mask, s_pass_mask); 749 750 if (depth->enabled && stencil[0].enabled) 751 lp_build_mask_update(mask, z_pass); 752 753 if (do_branch) 754 lp_build_mask_check(mask); 755 756} 757 758 759void 760lp_build_depth_write(LLVMBuilderRef builder, 761 const struct util_format_description *format_desc, 762 LLVMValueRef zs_dst_ptr, 763 LLVMValueRef zs_value) 764{ 765 zs_dst_ptr = LLVMBuildBitCast(builder, zs_dst_ptr, 766 LLVMPointerType(LLVMTypeOf(zs_value), 0), ""); 767 768 LLVMBuildStore(builder, zs_value, zs_dst_ptr); 769} 770 771 772void 773lp_build_deferred_depth_write(LLVMBuilderRef builder, 774 struct lp_type z_src_type, 775 const struct util_format_description *format_desc, 776 struct lp_build_mask_context *mask, 777 LLVMValueRef zs_dst_ptr, 778 LLVMValueRef zs_value) 779{ 780 struct lp_type z_type; 781 struct lp_build_context z_bld; 782 LLVMValueRef z_dst; 783 784 /* XXX: pointlessly redo type logic: 785 */ 786 z_type = lp_depth_type(format_desc, z_src_type.width*z_src_type.length); 787 lp_build_context_init(&z_bld, builder, z_type); 788 789 zs_dst_ptr = LLVMBuildBitCast(builder, zs_dst_ptr, 790 LLVMPointerType(z_bld.vec_type, 0), ""); 791 792 z_dst = LLVMBuildLoad(builder, zs_dst_ptr, "zsbufval"); 793 z_dst = lp_build_select(&z_bld, lp_build_mask_value(mask), zs_value, z_dst); 794 795 LLVMBuildStore(builder, z_dst, zs_dst_ptr); 796} 797