lp_bld_depth.c revision c7aa8da9573f6d505bec894b4738f0521511b9f0
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 LLVMBuilderRef builder = bld->gallivm->builder; 101 const unsigned stencilMax = 255; /* XXX fix */ 102 struct lp_type type = bld->type; 103 LLVMValueRef res; 104 105 assert(type.sign); 106 107 assert(stencil->enabled); 108 109 if (stencil->valuemask != stencilMax) { 110 /* compute stencilRef = stencilRef & valuemask */ 111 LLVMValueRef valuemask = lp_build_const_int_vec(bld->gallivm, type, stencil->valuemask); 112 stencilRef = LLVMBuildAnd(builder, stencilRef, valuemask, ""); 113 /* compute stencilVals = stencilVals & valuemask */ 114 stencilVals = LLVMBuildAnd(builder, stencilVals, valuemask, ""); 115 } 116 117 res = lp_build_cmp(bld, stencil->func, stencilRef, stencilVals); 118 119 return res; 120} 121 122 123/** 124 * Do the one or two-sided stencil test comparison. 125 * \sa lp_build_stencil_test_single 126 * \param front_facing an integer vector mask, indicating front (~0) or back 127 * (0) facing polygon. If NULL, assume front-facing. 128 */ 129static LLVMValueRef 130lp_build_stencil_test(struct lp_build_context *bld, 131 const struct pipe_stencil_state stencil[2], 132 LLVMValueRef stencilRefs[2], 133 LLVMValueRef stencilVals, 134 LLVMValueRef front_facing) 135{ 136 LLVMValueRef res; 137 138 assert(stencil[0].enabled); 139 140 /* do front face test */ 141 res = lp_build_stencil_test_single(bld, &stencil[0], 142 stencilRefs[0], stencilVals); 143 144 if (stencil[1].enabled && front_facing != NULL) { 145 /* do back face test */ 146 LLVMValueRef back_res; 147 148 back_res = lp_build_stencil_test_single(bld, &stencil[1], 149 stencilRefs[1], stencilVals); 150 151 res = lp_build_select(bld, front_facing, res, back_res); 152 } 153 154 return res; 155} 156 157 158/** 159 * Apply the stencil operator (add/sub/keep/etc) to the given vector 160 * of stencil values. 161 * \return new stencil values vector 162 */ 163static LLVMValueRef 164lp_build_stencil_op_single(struct lp_build_context *bld, 165 const struct pipe_stencil_state *stencil, 166 enum stencil_op op, 167 LLVMValueRef stencilRef, 168 LLVMValueRef stencilVals) 169 170{ 171 LLVMBuilderRef builder = bld->gallivm->builder; 172 struct lp_type type = bld->type; 173 LLVMValueRef res; 174 LLVMValueRef max = lp_build_const_int_vec(bld->gallivm, type, 0xff); 175 unsigned stencil_op; 176 177 assert(type.sign); 178 179 switch (op) { 180 case S_FAIL_OP: 181 stencil_op = stencil->fail_op; 182 break; 183 case Z_FAIL_OP: 184 stencil_op = stencil->zfail_op; 185 break; 186 case Z_PASS_OP: 187 stencil_op = stencil->zpass_op; 188 break; 189 default: 190 assert(0 && "Invalid stencil_op mode"); 191 stencil_op = PIPE_STENCIL_OP_KEEP; 192 } 193 194 switch (stencil_op) { 195 case PIPE_STENCIL_OP_KEEP: 196 res = stencilVals; 197 /* we can return early for this case */ 198 return res; 199 case PIPE_STENCIL_OP_ZERO: 200 res = bld->zero; 201 break; 202 case PIPE_STENCIL_OP_REPLACE: 203 res = stencilRef; 204 break; 205 case PIPE_STENCIL_OP_INCR: 206 res = lp_build_add(bld, stencilVals, bld->one); 207 res = lp_build_min(bld, res, max); 208 break; 209 case PIPE_STENCIL_OP_DECR: 210 res = lp_build_sub(bld, stencilVals, bld->one); 211 res = lp_build_max(bld, res, bld->zero); 212 break; 213 case PIPE_STENCIL_OP_INCR_WRAP: 214 res = lp_build_add(bld, stencilVals, bld->one); 215 res = LLVMBuildAnd(builder, res, max, ""); 216 break; 217 case PIPE_STENCIL_OP_DECR_WRAP: 218 res = lp_build_sub(bld, stencilVals, bld->one); 219 res = LLVMBuildAnd(builder, res, max, ""); 220 break; 221 case PIPE_STENCIL_OP_INVERT: 222 res = LLVMBuildNot(builder, stencilVals, ""); 223 res = LLVMBuildAnd(builder, res, max, ""); 224 break; 225 default: 226 assert(0 && "bad stencil op mode"); 227 res = bld->undef; 228 } 229 230 return res; 231} 232 233 234/** 235 * Do the one or two-sided stencil test op/update. 236 */ 237static LLVMValueRef 238lp_build_stencil_op(struct lp_build_context *bld, 239 const struct pipe_stencil_state stencil[2], 240 enum stencil_op op, 241 LLVMValueRef stencilRefs[2], 242 LLVMValueRef stencilVals, 243 LLVMValueRef mask, 244 LLVMValueRef front_facing) 245 246{ 247 LLVMBuilderRef builder = bld->gallivm->builder; 248 LLVMValueRef res; 249 250 assert(stencil[0].enabled); 251 252 /* do front face op */ 253 res = lp_build_stencil_op_single(bld, &stencil[0], op, 254 stencilRefs[0], stencilVals); 255 256 if (stencil[1].enabled && front_facing != NULL) { 257 /* do back face op */ 258 LLVMValueRef back_res; 259 260 back_res = lp_build_stencil_op_single(bld, &stencil[1], op, 261 stencilRefs[1], stencilVals); 262 263 res = lp_build_select(bld, front_facing, res, back_res); 264 } 265 266 if (stencil->writemask != 0xff) { 267 /* mask &= stencil->writemask */ 268 LLVMValueRef writemask = lp_build_const_int_vec(bld->gallivm, bld->type, 269 stencil->writemask); 270 mask = LLVMBuildAnd(builder, mask, writemask, ""); 271 /* res = (res & mask) | (stencilVals & ~mask) */ 272 res = lp_build_select_bitwise(bld, mask, res, stencilVals); 273 } 274 else { 275 /* res = mask ? res : stencilVals */ 276 res = lp_build_select(bld, mask, res, stencilVals); 277 } 278 279 return res; 280} 281 282 283 284/** 285 * Return a type appropriate for depth/stencil testing. 286 */ 287struct lp_type 288lp_depth_type(const struct util_format_description *format_desc, 289 unsigned length) 290{ 291 struct lp_type type; 292 unsigned swizzle; 293 294 assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS); 295 assert(format_desc->block.width == 1); 296 assert(format_desc->block.height == 1); 297 298 swizzle = format_desc->swizzle[0]; 299 assert(swizzle < 4); 300 301 memset(&type, 0, sizeof type); 302 type.width = format_desc->block.bits; 303 304 if(format_desc->channel[swizzle].type == UTIL_FORMAT_TYPE_FLOAT) { 305 type.floating = TRUE; 306 assert(swizzle == 0); 307 assert(format_desc->channel[swizzle].size == format_desc->block.bits); 308 } 309 else if(format_desc->channel[swizzle].type == UTIL_FORMAT_TYPE_UNSIGNED) { 310 assert(format_desc->block.bits <= 32); 311 assert(format_desc->channel[swizzle].normalized); 312 if (format_desc->channel[swizzle].size < format_desc->block.bits) { 313 /* Prefer signed integers when possible, as SSE has less support 314 * for unsigned comparison; 315 */ 316 type.sign = TRUE; 317 } 318 } 319 else 320 assert(0); 321 322 assert(type.width <= length); 323 type.length = length / type.width; 324 325 return type; 326} 327 328 329/** 330 * Compute bitmask and bit shift to apply to the incoming fragment Z values 331 * and the Z buffer values needed before doing the Z comparison. 332 * 333 * Note that we leave the Z bits in the position that we find them 334 * in the Z buffer (typically 0xffffff00 or 0x00ffffff). That lets us 335 * get by with fewer bit twiddling steps. 336 */ 337static boolean 338get_z_shift_and_mask(const struct util_format_description *format_desc, 339 unsigned *shift, unsigned *width, unsigned *mask) 340{ 341 const unsigned total_bits = format_desc->block.bits; 342 unsigned z_swizzle; 343 unsigned chan; 344 unsigned padding_left, padding_right; 345 346 assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS); 347 assert(format_desc->block.width == 1); 348 assert(format_desc->block.height == 1); 349 350 z_swizzle = format_desc->swizzle[0]; 351 352 if (z_swizzle == UTIL_FORMAT_SWIZZLE_NONE) 353 return FALSE; 354 355 *width = format_desc->channel[z_swizzle].size; 356 357 padding_right = 0; 358 for (chan = 0; chan < z_swizzle; ++chan) 359 padding_right += format_desc->channel[chan].size; 360 361 padding_left = 362 total_bits - (padding_right + *width); 363 364 if (padding_left || padding_right) { 365 unsigned long long mask_left = (1ULL << (total_bits - padding_left)) - 1; 366 unsigned long long mask_right = (1ULL << (padding_right)) - 1; 367 *mask = mask_left ^ mask_right; 368 } 369 else { 370 *mask = 0xffffffff; 371 } 372 373 *shift = padding_right; 374 375 return TRUE; 376} 377 378 379/** 380 * Compute bitmask and bit shift to apply to the framebuffer pixel values 381 * to put the stencil bits in the least significant position. 382 * (i.e. 0x000000ff) 383 */ 384static boolean 385get_s_shift_and_mask(const struct util_format_description *format_desc, 386 unsigned *shift, unsigned *mask) 387{ 388 unsigned s_swizzle; 389 unsigned chan, sz; 390 391 s_swizzle = format_desc->swizzle[1]; 392 393 if (s_swizzle == UTIL_FORMAT_SWIZZLE_NONE) 394 return FALSE; 395 396 *shift = 0; 397 for (chan = 0; chan < s_swizzle; chan++) 398 *shift += format_desc->channel[chan].size; 399 400 sz = format_desc->channel[s_swizzle].size; 401 *mask = (1U << sz) - 1U; 402 403 return TRUE; 404} 405 406 407/** 408 * Perform the occlusion test and increase the counter. 409 * Test the depth mask. Add the number of channel which has none zero mask 410 * into the occlusion counter. e.g. maskvalue is {-1, -1, -1, -1}. 411 * The counter will add 4. 412 * 413 * \param type holds element type of the mask vector. 414 * \param maskvalue is the depth test mask. 415 * \param counter is a pointer of the uint32 counter. 416 */ 417void 418lp_build_occlusion_count(struct gallivm_state *gallivm, 419 struct lp_type type, 420 LLVMValueRef maskvalue, 421 LLVMValueRef counter) 422{ 423 LLVMBuilderRef builder = gallivm->builder; 424 LLVMContextRef context = gallivm->context; 425 LLVMValueRef countmask = lp_build_const_int_vec(gallivm, type, 1); 426 LLVMValueRef countv = LLVMBuildAnd(builder, maskvalue, countmask, "countv"); 427 LLVMTypeRef i8v16 = LLVMVectorType(LLVMInt8TypeInContext(context), 16); 428 LLVMValueRef counti = LLVMBuildBitCast(builder, countv, i8v16, "counti"); 429 LLVMValueRef maskarray[4] = { 430 lp_build_const_int32(gallivm, 0), 431 lp_build_const_int32(gallivm, 4), 432 lp_build_const_int32(gallivm, 8), 433 lp_build_const_int32(gallivm, 12) 434 }; 435 LLVMValueRef shufflemask = LLVMConstVector(maskarray, 4); 436 LLVMValueRef shufflev = LLVMBuildShuffleVector(builder, counti, LLVMGetUndef(i8v16), shufflemask, "shufflev"); 437 LLVMValueRef shuffle = LLVMBuildBitCast(builder, shufflev, LLVMInt32TypeInContext(context), "shuffle"); 438 LLVMValueRef count = lp_build_intrinsic_unary(builder, "llvm.ctpop.i32", LLVMInt32TypeInContext(context), shuffle); 439 LLVMValueRef orig = LLVMBuildLoad(builder, counter, "orig"); 440 LLVMValueRef incr = LLVMBuildAdd(builder, orig, count, "incr"); 441 LLVMBuildStore(builder, incr, counter); 442} 443 444 445 446/** 447 * Generate code for performing depth and/or stencil tests. 448 * We operate on a vector of values (typically a 2x2 quad). 449 * 450 * \param depth the depth test state 451 * \param stencil the front/back stencil state 452 * \param type the data type of the fragment depth/stencil values 453 * \param format_desc description of the depth/stencil surface 454 * \param mask the alive/dead pixel mask for the quad (vector) 455 * \param stencil_refs the front/back stencil ref values (scalar) 456 * \param z_src the incoming depth/stencil values (a 2x2 quad, float32) 457 * \param zs_dst_ptr pointer to depth/stencil values in framebuffer 458 * \param facing contains boolean value indicating front/back facing polygon 459 */ 460void 461lp_build_depth_stencil_test(struct gallivm_state *gallivm, 462 const struct pipe_depth_state *depth, 463 const struct pipe_stencil_state stencil[2], 464 struct lp_type z_src_type, 465 const struct util_format_description *format_desc, 466 struct lp_build_mask_context *mask, 467 LLVMValueRef stencil_refs[2], 468 LLVMValueRef z_src, 469 LLVMValueRef zs_dst_ptr, 470 LLVMValueRef face, 471 LLVMValueRef *zs_value, 472 boolean do_branch) 473{ 474 LLVMBuilderRef builder = gallivm->builder; 475 struct lp_type z_type; 476 struct lp_build_context z_bld; 477 struct lp_build_context s_bld; 478 struct lp_type s_type; 479 unsigned z_shift = 0, z_width = 0, z_mask = 0; 480 LLVMValueRef zs_dst, z_dst = NULL; 481 LLVMValueRef stencil_vals = NULL; 482 LLVMValueRef z_bitmask = NULL, stencil_shift = NULL; 483 LLVMValueRef z_pass = NULL, s_pass_mask = NULL; 484 LLVMValueRef orig_mask = lp_build_mask_value(mask); 485 LLVMValueRef front_facing = NULL; 486 487 488 /* 489 * Depths are expected to be between 0 and 1, even if they are stored in 490 * floats. Setting these bits here will ensure that the lp_build_conv() call 491 * below won't try to unnecessarily clamp the incoming values. 492 */ 493 if(z_src_type.floating) { 494 z_src_type.sign = FALSE; 495 z_src_type.norm = TRUE; 496 } 497 else { 498 assert(!z_src_type.sign); 499 assert(z_src_type.norm); 500 } 501 502 /* Pick the depth type. */ 503 z_type = lp_depth_type(format_desc, z_src_type.width*z_src_type.length); 504 505 /* FIXME: Cope with a depth test type with a different bit width. */ 506 assert(z_type.width == z_src_type.width); 507 assert(z_type.length == z_src_type.length); 508 509 /* Sanity checking */ 510 { 511 const unsigned z_swizzle = format_desc->swizzle[0]; 512 const unsigned s_swizzle = format_desc->swizzle[1]; 513 514 assert(z_swizzle != UTIL_FORMAT_SWIZZLE_NONE || 515 s_swizzle != UTIL_FORMAT_SWIZZLE_NONE); 516 517 assert(depth->enabled || stencil[0].enabled); 518 519 assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS); 520 assert(format_desc->block.width == 1); 521 assert(format_desc->block.height == 1); 522 523 if (stencil[0].enabled) { 524 assert(format_desc->format == PIPE_FORMAT_Z24_UNORM_S8_UINT || 525 format_desc->format == PIPE_FORMAT_S8_UINT_Z24_UNORM); 526 } 527 528 assert(z_swizzle < 4); 529 assert(format_desc->block.bits == z_type.width); 530 if (z_type.floating) { 531 assert(z_swizzle == 0); 532 assert(format_desc->channel[z_swizzle].type == 533 UTIL_FORMAT_TYPE_FLOAT); 534 assert(format_desc->channel[z_swizzle].size == 535 format_desc->block.bits); 536 } 537 else { 538 assert(format_desc->channel[z_swizzle].type == 539 UTIL_FORMAT_TYPE_UNSIGNED); 540 assert(format_desc->channel[z_swizzle].normalized); 541 assert(!z_type.fixed); 542 } 543 } 544 545 546 /* Setup build context for Z vals */ 547 lp_build_context_init(&z_bld, gallivm, z_type); 548 549 /* Setup build context for stencil vals */ 550 s_type = lp_type_int_vec(z_type.width); 551 lp_build_context_init(&s_bld, gallivm, s_type); 552 553 /* Load current z/stencil value from z/stencil buffer */ 554 zs_dst_ptr = LLVMBuildBitCast(builder, 555 zs_dst_ptr, 556 LLVMPointerType(z_bld.vec_type, 0), ""); 557 zs_dst = LLVMBuildLoad(builder, zs_dst_ptr, ""); 558 559 lp_build_name(zs_dst, "zs_dst"); 560 561 562 /* Compute and apply the Z/stencil bitmasks and shifts. 563 */ 564 { 565 unsigned s_shift, s_mask; 566 567 if (get_z_shift_and_mask(format_desc, &z_shift, &z_width, &z_mask)) { 568 if (z_mask != 0xffffffff) { 569 z_bitmask = lp_build_const_int_vec(gallivm, z_type, z_mask); 570 } 571 572 /* 573 * Align the framebuffer Z 's LSB to the right. 574 */ 575 if (z_shift) { 576 LLVMValueRef shift = lp_build_const_int_vec(gallivm, z_type, z_shift); 577 z_dst = LLVMBuildLShr(builder, zs_dst, shift, "z_dst"); 578 } else if (z_bitmask) { 579 /* TODO: Instead of loading a mask from memory and ANDing, it's 580 * probably faster to just shake the bits with two shifts. */ 581 z_dst = LLVMBuildAnd(builder, zs_dst, z_bitmask, "z_dst"); 582 } else { 583 z_dst = zs_dst; 584 lp_build_name(z_dst, "z_dst"); 585 } 586 } 587 588 if (get_s_shift_and_mask(format_desc, &s_shift, &s_mask)) { 589 if (s_shift) { 590 LLVMValueRef shift = lp_build_const_int_vec(gallivm, s_type, s_shift); 591 stencil_vals = LLVMBuildLShr(builder, zs_dst, shift, ""); 592 stencil_shift = shift; /* used below */ 593 } 594 else { 595 stencil_vals = zs_dst; 596 } 597 598 if (s_mask != 0xffffffff) { 599 LLVMValueRef mask = lp_build_const_int_vec(gallivm, s_type, s_mask); 600 stencil_vals = LLVMBuildAnd(builder, stencil_vals, mask, ""); 601 } 602 603 lp_build_name(stencil_vals, "s_dst"); 604 } 605 } 606 607 if (stencil[0].enabled) { 608 609 if (face) { 610 LLVMValueRef zero = lp_build_const_int32(gallivm, 0); 611 612 /* front_facing = face != 0 ? ~0 : 0 */ 613 front_facing = LLVMBuildICmp(builder, LLVMIntNE, face, zero, ""); 614 front_facing = LLVMBuildSExt(builder, front_facing, 615 LLVMIntTypeInContext(gallivm->context, 616 s_bld.type.length*s_bld.type.width), 617 ""); 618 front_facing = LLVMBuildBitCast(builder, front_facing, 619 s_bld.int_vec_type, ""); 620 } 621 622 /* convert scalar stencil refs into vectors */ 623 stencil_refs[0] = lp_build_broadcast_scalar(&s_bld, stencil_refs[0]); 624 stencil_refs[1] = lp_build_broadcast_scalar(&s_bld, stencil_refs[1]); 625 626 s_pass_mask = lp_build_stencil_test(&s_bld, stencil, 627 stencil_refs, stencil_vals, 628 front_facing); 629 630 /* apply stencil-fail operator */ 631 { 632 LLVMValueRef s_fail_mask = lp_build_andnot(&s_bld, orig_mask, s_pass_mask); 633 stencil_vals = lp_build_stencil_op(&s_bld, stencil, S_FAIL_OP, 634 stencil_refs, stencil_vals, 635 s_fail_mask, front_facing); 636 } 637 } 638 639 if (depth->enabled) { 640 /* 641 * Convert fragment Z to the desired type, aligning the LSB to the right. 642 */ 643 644 assert(z_type.width == z_src_type.width); 645 assert(z_type.length == z_src_type.length); 646 assert(lp_check_value(z_src_type, z_src)); 647 if (z_src_type.floating) { 648 /* 649 * Convert from floating point values 650 */ 651 652 if (!z_type.floating) { 653 z_src = lp_build_clamped_float_to_unsigned_norm(gallivm, 654 z_src_type, 655 z_width, 656 z_src); 657 } 658 } else { 659 /* 660 * Convert from unsigned normalized values. 661 */ 662 663 assert(!z_src_type.sign); 664 assert(!z_src_type.fixed); 665 assert(z_src_type.norm); 666 assert(!z_type.floating); 667 if (z_src_type.width > z_width) { 668 LLVMValueRef shift = lp_build_const_int_vec(gallivm, z_src_type, 669 z_src_type.width - z_width); 670 z_src = LLVMBuildLShr(builder, z_src, shift, ""); 671 } 672 } 673 assert(lp_check_value(z_type, z_src)); 674 675 lp_build_name(z_src, "z_src"); 676 677 /* compare src Z to dst Z, returning 'pass' mask */ 678 z_pass = lp_build_cmp(&z_bld, depth->func, z_src, z_dst); 679 680 if (!stencil[0].enabled) { 681 /* We can potentially skip all remaining operations here, but only 682 * if stencil is disabled because we still need to update the stencil 683 * buffer values. Don't need to update Z buffer values. 684 */ 685 lp_build_mask_update(mask, z_pass); 686 687 if (do_branch) { 688 lp_build_mask_check(mask); 689 do_branch = FALSE; 690 } 691 } 692 693 if (depth->writemask) { 694 LLVMValueRef zselectmask; 695 696 /* mask off bits that failed Z test */ 697 zselectmask = LLVMBuildAnd(builder, orig_mask, z_pass, ""); 698 699 /* mask off bits that failed stencil test */ 700 if (s_pass_mask) { 701 zselectmask = LLVMBuildAnd(builder, zselectmask, s_pass_mask, ""); 702 } 703 704 /* Mix the old and new Z buffer values. 705 * z_dst[i] = zselectmask[i] ? z_src[i] : z_dst[i] 706 */ 707 z_dst = lp_build_select(&z_bld, zselectmask, z_src, z_dst); 708 } 709 710 if (stencil[0].enabled) { 711 /* update stencil buffer values according to z pass/fail result */ 712 LLVMValueRef z_fail_mask, z_pass_mask; 713 714 /* apply Z-fail operator */ 715 z_fail_mask = lp_build_andnot(&z_bld, orig_mask, z_pass); 716 stencil_vals = lp_build_stencil_op(&s_bld, stencil, Z_FAIL_OP, 717 stencil_refs, stencil_vals, 718 z_fail_mask, front_facing); 719 720 /* apply Z-pass operator */ 721 z_pass_mask = LLVMBuildAnd(builder, orig_mask, z_pass, ""); 722 stencil_vals = lp_build_stencil_op(&s_bld, stencil, Z_PASS_OP, 723 stencil_refs, stencil_vals, 724 z_pass_mask, front_facing); 725 } 726 } 727 else { 728 /* No depth test: apply Z-pass operator to stencil buffer values which 729 * passed the stencil test. 730 */ 731 s_pass_mask = LLVMBuildAnd(builder, orig_mask, s_pass_mask, ""); 732 stencil_vals = lp_build_stencil_op(&s_bld, stencil, Z_PASS_OP, 733 stencil_refs, stencil_vals, 734 s_pass_mask, front_facing); 735 } 736 737 /* Put Z and ztencil bits in the right place */ 738 if (z_dst && z_shift) { 739 LLVMValueRef shift = lp_build_const_int_vec(gallivm, z_type, z_shift); 740 z_dst = LLVMBuildShl(builder, z_dst, shift, ""); 741 } 742 if (stencil_vals && stencil_shift) 743 stencil_vals = LLVMBuildShl(builder, stencil_vals, 744 stencil_shift, ""); 745 746 /* Finally, merge/store the z/stencil values */ 747 if ((depth->enabled && depth->writemask) || 748 (stencil[0].enabled && stencil[0].writemask)) { 749 750 if (z_dst && stencil_vals) 751 zs_dst = LLVMBuildOr(builder, z_dst, stencil_vals, ""); 752 else if (z_dst) 753 zs_dst = z_dst; 754 else 755 zs_dst = stencil_vals; 756 757 *zs_value = zs_dst; 758 } 759 760 if (s_pass_mask) 761 lp_build_mask_update(mask, s_pass_mask); 762 763 if (depth->enabled && stencil[0].enabled) 764 lp_build_mask_update(mask, z_pass); 765 766 if (do_branch) 767 lp_build_mask_check(mask); 768 769} 770 771 772void 773lp_build_depth_write(LLVMBuilderRef builder, 774 const struct util_format_description *format_desc, 775 LLVMValueRef zs_dst_ptr, 776 LLVMValueRef zs_value) 777{ 778 zs_dst_ptr = LLVMBuildBitCast(builder, zs_dst_ptr, 779 LLVMPointerType(LLVMTypeOf(zs_value), 0), ""); 780 781 LLVMBuildStore(builder, zs_value, zs_dst_ptr); 782} 783 784 785void 786lp_build_deferred_depth_write(struct gallivm_state *gallivm, 787 struct lp_type z_src_type, 788 const struct util_format_description *format_desc, 789 struct lp_build_mask_context *mask, 790 LLVMValueRef zs_dst_ptr, 791 LLVMValueRef zs_value) 792{ 793 struct lp_type z_type; 794 struct lp_build_context z_bld; 795 LLVMValueRef z_dst; 796 LLVMBuilderRef builder = gallivm->builder; 797 798 /* XXX: pointlessly redo type logic: 799 */ 800 z_type = lp_depth_type(format_desc, z_src_type.width*z_src_type.length); 801 lp_build_context_init(&z_bld, gallivm, z_type); 802 803 zs_dst_ptr = LLVMBuildBitCast(builder, zs_dst_ptr, 804 LLVMPointerType(z_bld.vec_type, 0), ""); 805 806 z_dst = LLVMBuildLoad(builder, zs_dst_ptr, "zsbufval"); 807 z_dst = lp_build_select(&z_bld, lp_build_mask_value(mask), zs_value, z_dst); 808 809 LLVMBuildStore(builder, z_dst, zs_dst_ptr); 810} 811