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 (at) vmware.com> 57 * @author Brian Paul <jfonseca (at) vmware.com> 58 */ 59 60 #include "pipe/p_state.h" 61 #include "util/u_format.h" 62 #include "util/u_cpu_detect.h" 63 64 #include "gallivm/lp_bld_type.h" 65 #include "gallivm/lp_bld_arit.h" 66 #include "gallivm/lp_bld_bitarit.h" 67 #include "gallivm/lp_bld_const.h" 68 #include "gallivm/lp_bld_conv.h" 69 #include "gallivm/lp_bld_logic.h" 70 #include "gallivm/lp_bld_flow.h" 71 #include "gallivm/lp_bld_intr.h" 72 #include "gallivm/lp_bld_debug.h" 73 #include "gallivm/lp_bld_swizzle.h" 74 75 #include "lp_bld_depth.h" 76 77 78 /** Used to select fields from pipe_stencil_state */ 79 enum stencil_op { 80 S_FAIL_OP, 81 Z_FAIL_OP, 82 Z_PASS_OP 83 }; 84 85 86 87 /** 88 * Do the stencil test comparison (compare FB stencil values against ref value). 89 * This will be used twice when generating two-sided stencil code. 90 * \param stencil the front/back stencil state 91 * \param stencilRef the stencil reference value, replicated as a vector 92 * \param stencilVals vector of stencil values from framebuffer 93 * \return vector mask of pass/fail values (~0 or 0) 94 */ 95 static LLVMValueRef 96 lp_build_stencil_test_single(struct lp_build_context *bld, 97 const struct pipe_stencil_state *stencil, 98 LLVMValueRef stencilRef, 99 LLVMValueRef stencilVals) 100 { 101 LLVMBuilderRef builder = bld->gallivm->builder; 102 const unsigned stencilMax = 255; /* XXX fix */ 103 struct lp_type type = bld->type; 104 LLVMValueRef res; 105 106 /* 107 * SSE2 has intrinsics for signed comparisons, but not unsigned ones. Values 108 * are between 0..255 so ensure we generate the fastest comparisons for 109 * wider elements. 110 */ 111 if (type.width <= 8) { 112 assert(!type.sign); 113 } else { 114 assert(type.sign); 115 } 116 117 assert(stencil->enabled); 118 119 if (stencil->valuemask != stencilMax) { 120 /* compute stencilRef = stencilRef & valuemask */ 121 LLVMValueRef valuemask = lp_build_const_int_vec(bld->gallivm, type, stencil->valuemask); 122 stencilRef = LLVMBuildAnd(builder, stencilRef, valuemask, ""); 123 /* compute stencilVals = stencilVals & valuemask */ 124 stencilVals = LLVMBuildAnd(builder, stencilVals, valuemask, ""); 125 } 126 127 res = lp_build_cmp(bld, stencil->func, stencilRef, stencilVals); 128 129 return res; 130 } 131 132 133 /** 134 * Do the one or two-sided stencil test comparison. 135 * \sa lp_build_stencil_test_single 136 * \param front_facing an integer vector mask, indicating front (~0) or back 137 * (0) facing polygon. If NULL, assume front-facing. 138 */ 139 static LLVMValueRef 140 lp_build_stencil_test(struct lp_build_context *bld, 141 const struct pipe_stencil_state stencil[2], 142 LLVMValueRef stencilRefs[2], 143 LLVMValueRef stencilVals, 144 LLVMValueRef front_facing) 145 { 146 LLVMValueRef res; 147 148 assert(stencil[0].enabled); 149 150 /* do front face test */ 151 res = lp_build_stencil_test_single(bld, &stencil[0], 152 stencilRefs[0], stencilVals); 153 154 if (stencil[1].enabled && front_facing != NULL) { 155 /* do back face test */ 156 LLVMValueRef back_res; 157 158 back_res = lp_build_stencil_test_single(bld, &stencil[1], 159 stencilRefs[1], stencilVals); 160 161 res = lp_build_select(bld, front_facing, res, back_res); 162 } 163 164 return res; 165 } 166 167 168 /** 169 * Apply the stencil operator (add/sub/keep/etc) to the given vector 170 * of stencil values. 171 * \return new stencil values vector 172 */ 173 static LLVMValueRef 174 lp_build_stencil_op_single(struct lp_build_context *bld, 175 const struct pipe_stencil_state *stencil, 176 enum stencil_op op, 177 LLVMValueRef stencilRef, 178 LLVMValueRef stencilVals) 179 180 { 181 LLVMBuilderRef builder = bld->gallivm->builder; 182 struct lp_type type = bld->type; 183 LLVMValueRef res; 184 LLVMValueRef max = lp_build_const_int_vec(bld->gallivm, type, 0xff); 185 unsigned stencil_op; 186 187 assert(type.sign); 188 189 switch (op) { 190 case S_FAIL_OP: 191 stencil_op = stencil->fail_op; 192 break; 193 case Z_FAIL_OP: 194 stencil_op = stencil->zfail_op; 195 break; 196 case Z_PASS_OP: 197 stencil_op = stencil->zpass_op; 198 break; 199 default: 200 assert(0 && "Invalid stencil_op mode"); 201 stencil_op = PIPE_STENCIL_OP_KEEP; 202 } 203 204 switch (stencil_op) { 205 case PIPE_STENCIL_OP_KEEP: 206 res = stencilVals; 207 /* we can return early for this case */ 208 return res; 209 case PIPE_STENCIL_OP_ZERO: 210 res = bld->zero; 211 break; 212 case PIPE_STENCIL_OP_REPLACE: 213 res = stencilRef; 214 break; 215 case PIPE_STENCIL_OP_INCR: 216 res = lp_build_add(bld, stencilVals, bld->one); 217 res = lp_build_min(bld, res, max); 218 break; 219 case PIPE_STENCIL_OP_DECR: 220 res = lp_build_sub(bld, stencilVals, bld->one); 221 res = lp_build_max(bld, res, bld->zero); 222 break; 223 case PIPE_STENCIL_OP_INCR_WRAP: 224 res = lp_build_add(bld, stencilVals, bld->one); 225 res = LLVMBuildAnd(builder, res, max, ""); 226 break; 227 case PIPE_STENCIL_OP_DECR_WRAP: 228 res = lp_build_sub(bld, stencilVals, bld->one); 229 res = LLVMBuildAnd(builder, res, max, ""); 230 break; 231 case PIPE_STENCIL_OP_INVERT: 232 res = LLVMBuildNot(builder, stencilVals, ""); 233 res = LLVMBuildAnd(builder, res, max, ""); 234 break; 235 default: 236 assert(0 && "bad stencil op mode"); 237 res = bld->undef; 238 } 239 240 return res; 241 } 242 243 244 /** 245 * Do the one or two-sided stencil test op/update. 246 */ 247 static LLVMValueRef 248 lp_build_stencil_op(struct lp_build_context *bld, 249 const struct pipe_stencil_state stencil[2], 250 enum stencil_op op, 251 LLVMValueRef stencilRefs[2], 252 LLVMValueRef stencilVals, 253 LLVMValueRef mask, 254 LLVMValueRef front_facing) 255 256 { 257 LLVMBuilderRef builder = bld->gallivm->builder; 258 LLVMValueRef res; 259 260 assert(stencil[0].enabled); 261 262 /* do front face op */ 263 res = lp_build_stencil_op_single(bld, &stencil[0], op, 264 stencilRefs[0], stencilVals); 265 266 if (stencil[1].enabled && front_facing != NULL) { 267 /* do back face op */ 268 LLVMValueRef back_res; 269 270 back_res = lp_build_stencil_op_single(bld, &stencil[1], op, 271 stencilRefs[1], stencilVals); 272 273 res = lp_build_select(bld, front_facing, res, back_res); 274 } 275 276 if (stencil[0].writemask != 0xff || 277 (stencil[1].enabled && front_facing != NULL && stencil[1].writemask != 0xff)) { 278 /* mask &= stencil[0].writemask */ 279 LLVMValueRef writemask = lp_build_const_int_vec(bld->gallivm, bld->type, 280 stencil[0].writemask); 281 if (stencil[1].enabled && stencil[1].writemask != stencil[0].writemask && front_facing != NULL) { 282 LLVMValueRef back_writemask = lp_build_const_int_vec(bld->gallivm, bld->type, 283 stencil[1].writemask); 284 writemask = lp_build_select(bld, front_facing, writemask, back_writemask); 285 } 286 287 mask = LLVMBuildAnd(builder, mask, writemask, ""); 288 /* res = (res & mask) | (stencilVals & ~mask) */ 289 res = lp_build_select_bitwise(bld, mask, res, stencilVals); 290 } 291 else { 292 /* res = mask ? res : stencilVals */ 293 res = lp_build_select(bld, mask, res, stencilVals); 294 } 295 296 return res; 297 } 298 299 300 301 /** 302 * Return a type appropriate for depth/stencil testing. 303 */ 304 struct lp_type 305 lp_depth_type(const struct util_format_description *format_desc, 306 unsigned length) 307 { 308 struct lp_type type; 309 unsigned swizzle; 310 311 assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS); 312 assert(format_desc->block.width == 1); 313 assert(format_desc->block.height == 1); 314 315 swizzle = format_desc->swizzle[0]; 316 assert(swizzle < 4); 317 318 memset(&type, 0, sizeof type); 319 type.width = format_desc->block.bits; 320 321 if(format_desc->channel[swizzle].type == UTIL_FORMAT_TYPE_FLOAT) { 322 type.floating = TRUE; 323 assert(swizzle == 0); 324 assert(format_desc->channel[swizzle].size == format_desc->block.bits); 325 } 326 else if(format_desc->channel[swizzle].type == UTIL_FORMAT_TYPE_UNSIGNED) { 327 assert(format_desc->block.bits <= 32); 328 assert(format_desc->channel[swizzle].normalized); 329 if (format_desc->channel[swizzle].size < format_desc->block.bits) { 330 /* Prefer signed integers when possible, as SSE has less support 331 * for unsigned comparison; 332 */ 333 type.sign = TRUE; 334 } 335 } 336 else 337 assert(0); 338 339 assert(type.width <= length); 340 type.length = length / type.width; 341 342 return type; 343 } 344 345 346 /** 347 * Compute bitmask and bit shift to apply to the incoming fragment Z values 348 * and the Z buffer values needed before doing the Z comparison. 349 * 350 * Note that we leave the Z bits in the position that we find them 351 * in the Z buffer (typically 0xffffff00 or 0x00ffffff). That lets us 352 * get by with fewer bit twiddling steps. 353 */ 354 static boolean 355 get_z_shift_and_mask(const struct util_format_description *format_desc, 356 unsigned *shift, unsigned *width, unsigned *mask) 357 { 358 const unsigned total_bits = format_desc->block.bits; 359 unsigned z_swizzle; 360 unsigned chan; 361 unsigned padding_left, padding_right; 362 363 assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS); 364 assert(format_desc->block.width == 1); 365 assert(format_desc->block.height == 1); 366 367 z_swizzle = format_desc->swizzle[0]; 368 369 if (z_swizzle == UTIL_FORMAT_SWIZZLE_NONE) 370 return FALSE; 371 372 *width = format_desc->channel[z_swizzle].size; 373 374 padding_right = 0; 375 for (chan = 0; chan < z_swizzle; ++chan) 376 padding_right += format_desc->channel[chan].size; 377 378 padding_left = 379 total_bits - (padding_right + *width); 380 381 if (padding_left || padding_right) { 382 unsigned long long mask_left = (1ULL << (total_bits - padding_left)) - 1; 383 unsigned long long mask_right = (1ULL << (padding_right)) - 1; 384 *mask = mask_left ^ mask_right; 385 } 386 else { 387 *mask = 0xffffffff; 388 } 389 390 *shift = padding_right; 391 392 return TRUE; 393 } 394 395 396 /** 397 * Compute bitmask and bit shift to apply to the framebuffer pixel values 398 * to put the stencil bits in the least significant position. 399 * (i.e. 0x000000ff) 400 */ 401 static boolean 402 get_s_shift_and_mask(const struct util_format_description *format_desc, 403 unsigned *shift, unsigned *mask) 404 { 405 unsigned s_swizzle; 406 unsigned chan, sz; 407 408 s_swizzle = format_desc->swizzle[1]; 409 410 if (s_swizzle == UTIL_FORMAT_SWIZZLE_NONE) 411 return FALSE; 412 413 *shift = 0; 414 for (chan = 0; chan < s_swizzle; chan++) 415 *shift += format_desc->channel[chan].size; 416 417 sz = format_desc->channel[s_swizzle].size; 418 *mask = (1U << sz) - 1U; 419 420 return TRUE; 421 } 422 423 424 /** 425 * Perform the occlusion test and increase the counter. 426 * Test the depth mask. Add the number of channel which has none zero mask 427 * into the occlusion counter. e.g. maskvalue is {-1, -1, -1, -1}. 428 * The counter will add 4. 429 * 430 * \param type holds element type of the mask vector. 431 * \param maskvalue is the depth test mask. 432 * \param counter is a pointer of the uint32 counter. 433 */ 434 void 435 lp_build_occlusion_count(struct gallivm_state *gallivm, 436 struct lp_type type, 437 LLVMValueRef maskvalue, 438 LLVMValueRef counter) 439 { 440 LLVMBuilderRef builder = gallivm->builder; 441 LLVMContextRef context = gallivm->context; 442 LLVMValueRef countmask = lp_build_const_int_vec(gallivm, type, 1); 443 LLVMValueRef count, newcount; 444 445 assert(type.length <= 16); 446 assert(type.floating); 447 448 if(util_cpu_caps.has_sse && type.length == 4) { 449 const char *movmskintr = "llvm.x86.sse.movmsk.ps"; 450 const char *popcntintr = "llvm.ctpop.i32"; 451 LLVMValueRef bits = LLVMBuildBitCast(builder, maskvalue, 452 lp_build_vec_type(gallivm, type), ""); 453 bits = lp_build_intrinsic_unary(builder, movmskintr, 454 LLVMInt32TypeInContext(context), bits); 455 count = lp_build_intrinsic_unary(builder, popcntintr, 456 LLVMInt32TypeInContext(context), bits); 457 } 458 else if(util_cpu_caps.has_avx && type.length == 8) { 459 const char *movmskintr = "llvm.x86.avx.movmsk.ps.256"; 460 const char *popcntintr = "llvm.ctpop.i32"; 461 LLVMValueRef bits = LLVMBuildBitCast(builder, maskvalue, 462 lp_build_vec_type(gallivm, type), ""); 463 bits = lp_build_intrinsic_unary(builder, movmskintr, 464 LLVMInt32TypeInContext(context), bits); 465 count = lp_build_intrinsic_unary(builder, popcntintr, 466 LLVMInt32TypeInContext(context), bits); 467 } 468 else { 469 unsigned i; 470 LLVMValueRef countv = LLVMBuildAnd(builder, maskvalue, countmask, "countv"); 471 LLVMTypeRef counttype = LLVMIntTypeInContext(context, type.length * 8); 472 LLVMTypeRef i8vntype = LLVMVectorType(LLVMInt8TypeInContext(context), type.length * 4); 473 LLVMValueRef shufflev, countd; 474 LLVMValueRef shuffles[16]; 475 const char *popcntintr = NULL; 476 477 countv = LLVMBuildBitCast(builder, countv, i8vntype, ""); 478 479 for (i = 0; i < type.length; i++) { 480 shuffles[i] = lp_build_const_int32(gallivm, 4*i); 481 } 482 483 shufflev = LLVMConstVector(shuffles, type.length); 484 countd = LLVMBuildShuffleVector(builder, countv, LLVMGetUndef(i8vntype), shufflev, ""); 485 countd = LLVMBuildBitCast(builder, countd, counttype, "countd"); 486 487 /* 488 * XXX FIXME 489 * this is bad on cpus without popcount (on x86 supported by intel 490 * nehalem, amd barcelona, and up - not tied to sse42). 491 * Would be much faster to just sum the 4 elements of the vector with 492 * some horizontal add (shuffle/add/shuffle/add after the initial and). 493 */ 494 switch (type.length) { 495 case 4: 496 popcntintr = "llvm.ctpop.i32"; 497 break; 498 case 8: 499 popcntintr = "llvm.ctpop.i64"; 500 break; 501 case 16: 502 popcntintr = "llvm.ctpop.i128"; 503 break; 504 default: 505 assert(0); 506 } 507 count = lp_build_intrinsic_unary(builder, popcntintr, counttype, countd); 508 509 if (type.length > 4) { 510 count = LLVMBuildTrunc(builder, count, LLVMIntTypeInContext(context, 32), ""); 511 } 512 } 513 newcount = LLVMBuildLoad(builder, counter, "origcount"); 514 newcount = LLVMBuildAdd(builder, newcount, count, "newcount"); 515 LLVMBuildStore(builder, newcount, counter); 516 } 517 518 519 520 /** 521 * Generate code for performing depth and/or stencil tests. 522 * We operate on a vector of values (typically n 2x2 quads). 523 * 524 * \param depth the depth test state 525 * \param stencil the front/back stencil state 526 * \param type the data type of the fragment depth/stencil values 527 * \param format_desc description of the depth/stencil surface 528 * \param mask the alive/dead pixel mask for the quad (vector) 529 * \param stencil_refs the front/back stencil ref values (scalar) 530 * \param z_src the incoming depth/stencil values (n 2x2 quad values, float32) 531 * \param zs_dst_ptr pointer to depth/stencil values in framebuffer 532 * \param face contains boolean value indicating front/back facing polygon 533 */ 534 void 535 lp_build_depth_stencil_test(struct gallivm_state *gallivm, 536 const struct pipe_depth_state *depth, 537 const struct pipe_stencil_state stencil[2], 538 struct lp_type z_src_type, 539 const struct util_format_description *format_desc, 540 struct lp_build_mask_context *mask, 541 LLVMValueRef stencil_refs[2], 542 LLVMValueRef z_src, 543 LLVMValueRef zs_dst_ptr, 544 LLVMValueRef face, 545 LLVMValueRef *zs_value, 546 boolean do_branch) 547 { 548 LLVMBuilderRef builder = gallivm->builder; 549 struct lp_type z_type; 550 struct lp_build_context z_bld; 551 struct lp_build_context s_bld; 552 struct lp_type s_type; 553 unsigned z_shift = 0, z_width = 0, z_mask = 0; 554 LLVMValueRef zs_dst, z_dst = NULL; 555 LLVMValueRef stencil_vals = NULL; 556 LLVMValueRef z_bitmask = NULL, stencil_shift = NULL; 557 LLVMValueRef z_pass = NULL, s_pass_mask = NULL; 558 LLVMValueRef orig_mask = lp_build_mask_value(mask); 559 LLVMValueRef front_facing = NULL; 560 561 562 /* 563 * Depths are expected to be between 0 and 1, even if they are stored in 564 * floats. Setting these bits here will ensure that the lp_build_conv() call 565 * below won't try to unnecessarily clamp the incoming values. 566 */ 567 if(z_src_type.floating) { 568 z_src_type.sign = FALSE; 569 z_src_type.norm = TRUE; 570 } 571 else { 572 assert(!z_src_type.sign); 573 assert(z_src_type.norm); 574 } 575 576 /* Pick the depth type. */ 577 z_type = lp_depth_type(format_desc, z_src_type.width*z_src_type.length); 578 579 /* FIXME: Cope with a depth test type with a different bit width. */ 580 assert(z_type.width == z_src_type.width); 581 assert(z_type.length == z_src_type.length); 582 583 /* FIXME: for non-float depth/stencil might generate better code 584 * if we'd always split it up to use 128bit operations. 585 * For stencil we'd almost certainly want to pack to 8xi16 values, 586 * for z just run twice. 587 */ 588 589 /* Sanity checking */ 590 { 591 const unsigned z_swizzle = format_desc->swizzle[0]; 592 const unsigned s_swizzle = format_desc->swizzle[1]; 593 594 assert(z_swizzle != UTIL_FORMAT_SWIZZLE_NONE || 595 s_swizzle != UTIL_FORMAT_SWIZZLE_NONE); 596 597 assert(depth->enabled || stencil[0].enabled); 598 599 assert(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS); 600 assert(format_desc->block.width == 1); 601 assert(format_desc->block.height == 1); 602 603 if (stencil[0].enabled) { 604 assert(format_desc->format == PIPE_FORMAT_Z24_UNORM_S8_UINT || 605 format_desc->format == PIPE_FORMAT_S8_UINT_Z24_UNORM); 606 } 607 608 assert(z_swizzle < 4); 609 assert(format_desc->block.bits == z_type.width); 610 if (z_type.floating) { 611 assert(z_swizzle == 0); 612 assert(format_desc->channel[z_swizzle].type == 613 UTIL_FORMAT_TYPE_FLOAT); 614 assert(format_desc->channel[z_swizzle].size == 615 format_desc->block.bits); 616 } 617 else { 618 assert(format_desc->channel[z_swizzle].type == 619 UTIL_FORMAT_TYPE_UNSIGNED); 620 assert(format_desc->channel[z_swizzle].normalized); 621 assert(!z_type.fixed); 622 } 623 } 624 625 626 /* Setup build context for Z vals */ 627 lp_build_context_init(&z_bld, gallivm, z_type); 628 629 /* Setup build context for stencil vals */ 630 s_type = lp_int_type(z_type); 631 lp_build_context_init(&s_bld, gallivm, s_type); 632 633 /* Load current z/stencil value from z/stencil buffer */ 634 zs_dst_ptr = LLVMBuildBitCast(builder, 635 zs_dst_ptr, 636 LLVMPointerType(z_bld.vec_type, 0), ""); 637 zs_dst = LLVMBuildLoad(builder, zs_dst_ptr, ""); 638 639 lp_build_name(zs_dst, "zs_dst"); 640 641 642 /* Compute and apply the Z/stencil bitmasks and shifts. 643 */ 644 { 645 unsigned s_shift, s_mask; 646 647 if (get_z_shift_and_mask(format_desc, &z_shift, &z_width, &z_mask)) { 648 if (z_mask != 0xffffffff) { 649 z_bitmask = lp_build_const_int_vec(gallivm, z_type, z_mask); 650 } 651 652 /* 653 * Align the framebuffer Z 's LSB to the right. 654 */ 655 if (z_shift) { 656 LLVMValueRef shift = lp_build_const_int_vec(gallivm, z_type, z_shift); 657 z_dst = LLVMBuildLShr(builder, zs_dst, shift, "z_dst"); 658 } else if (z_bitmask) { 659 /* TODO: Instead of loading a mask from memory and ANDing, it's 660 * probably faster to just shake the bits with two shifts. */ 661 z_dst = LLVMBuildAnd(builder, zs_dst, z_bitmask, "z_dst"); 662 } else { 663 z_dst = zs_dst; 664 lp_build_name(z_dst, "z_dst"); 665 } 666 } 667 668 if (get_s_shift_and_mask(format_desc, &s_shift, &s_mask)) { 669 if (s_shift) { 670 LLVMValueRef shift = lp_build_const_int_vec(gallivm, s_type, s_shift); 671 stencil_vals = LLVMBuildLShr(builder, zs_dst, shift, ""); 672 stencil_shift = shift; /* used below */ 673 } 674 else { 675 stencil_vals = zs_dst; 676 } 677 678 if (s_mask != 0xffffffff) { 679 LLVMValueRef mask = lp_build_const_int_vec(gallivm, s_type, s_mask); 680 stencil_vals = LLVMBuildAnd(builder, stencil_vals, mask, ""); 681 } 682 683 lp_build_name(stencil_vals, "s_dst"); 684 } 685 } 686 687 if (stencil[0].enabled) { 688 689 if (face) { 690 LLVMValueRef zero = lp_build_const_int32(gallivm, 0); 691 692 /* front_facing = face != 0 ? ~0 : 0 */ 693 front_facing = LLVMBuildICmp(builder, LLVMIntNE, face, zero, ""); 694 front_facing = LLVMBuildSExt(builder, front_facing, 695 LLVMIntTypeInContext(gallivm->context, 696 s_bld.type.length*s_bld.type.width), 697 ""); 698 front_facing = LLVMBuildBitCast(builder, front_facing, 699 s_bld.int_vec_type, ""); 700 } 701 702 /* convert scalar stencil refs into vectors */ 703 stencil_refs[0] = lp_build_broadcast_scalar(&s_bld, stencil_refs[0]); 704 stencil_refs[1] = lp_build_broadcast_scalar(&s_bld, stencil_refs[1]); 705 706 s_pass_mask = lp_build_stencil_test(&s_bld, stencil, 707 stencil_refs, stencil_vals, 708 front_facing); 709 710 /* apply stencil-fail operator */ 711 { 712 LLVMValueRef s_fail_mask = lp_build_andnot(&s_bld, orig_mask, s_pass_mask); 713 stencil_vals = lp_build_stencil_op(&s_bld, stencil, S_FAIL_OP, 714 stencil_refs, stencil_vals, 715 s_fail_mask, front_facing); 716 } 717 } 718 719 if (depth->enabled) { 720 /* 721 * Convert fragment Z to the desired type, aligning the LSB to the right. 722 */ 723 724 assert(z_type.width == z_src_type.width); 725 assert(z_type.length == z_src_type.length); 726 assert(lp_check_value(z_src_type, z_src)); 727 if (z_src_type.floating) { 728 /* 729 * Convert from floating point values 730 */ 731 732 if (!z_type.floating) { 733 z_src = lp_build_clamped_float_to_unsigned_norm(gallivm, 734 z_src_type, 735 z_width, 736 z_src); 737 } 738 } else { 739 /* 740 * Convert from unsigned normalized values. 741 */ 742 743 assert(!z_src_type.sign); 744 assert(!z_src_type.fixed); 745 assert(z_src_type.norm); 746 assert(!z_type.floating); 747 if (z_src_type.width > z_width) { 748 LLVMValueRef shift = lp_build_const_int_vec(gallivm, z_src_type, 749 z_src_type.width - z_width); 750 z_src = LLVMBuildLShr(builder, z_src, shift, ""); 751 } 752 } 753 assert(lp_check_value(z_type, z_src)); 754 755 lp_build_name(z_src, "z_src"); 756 757 /* compare src Z to dst Z, returning 'pass' mask */ 758 z_pass = lp_build_cmp(&z_bld, depth->func, z_src, z_dst); 759 760 if (!stencil[0].enabled) { 761 /* We can potentially skip all remaining operations here, but only 762 * if stencil is disabled because we still need to update the stencil 763 * buffer values. Don't need to update Z buffer values. 764 */ 765 lp_build_mask_update(mask, z_pass); 766 767 if (do_branch) { 768 lp_build_mask_check(mask); 769 do_branch = FALSE; 770 } 771 } 772 773 if (depth->writemask) { 774 LLVMValueRef zselectmask; 775 776 /* mask off bits that failed Z test */ 777 zselectmask = LLVMBuildAnd(builder, orig_mask, z_pass, ""); 778 779 /* mask off bits that failed stencil test */ 780 if (s_pass_mask) { 781 zselectmask = LLVMBuildAnd(builder, zselectmask, s_pass_mask, ""); 782 } 783 784 /* Mix the old and new Z buffer values. 785 * z_dst[i] = zselectmask[i] ? z_src[i] : z_dst[i] 786 */ 787 z_dst = lp_build_select(&z_bld, zselectmask, z_src, z_dst); 788 } 789 790 if (stencil[0].enabled) { 791 /* update stencil buffer values according to z pass/fail result */ 792 LLVMValueRef z_fail_mask, z_pass_mask; 793 794 /* apply Z-fail operator */ 795 z_fail_mask = lp_build_andnot(&z_bld, orig_mask, z_pass); 796 stencil_vals = lp_build_stencil_op(&s_bld, stencil, Z_FAIL_OP, 797 stencil_refs, stencil_vals, 798 z_fail_mask, front_facing); 799 800 /* apply Z-pass operator */ 801 z_pass_mask = LLVMBuildAnd(builder, orig_mask, z_pass, ""); 802 stencil_vals = lp_build_stencil_op(&s_bld, stencil, Z_PASS_OP, 803 stencil_refs, stencil_vals, 804 z_pass_mask, front_facing); 805 } 806 } 807 else { 808 /* No depth test: apply Z-pass operator to stencil buffer values which 809 * passed the stencil test. 810 */ 811 s_pass_mask = LLVMBuildAnd(builder, orig_mask, s_pass_mask, ""); 812 stencil_vals = lp_build_stencil_op(&s_bld, stencil, Z_PASS_OP, 813 stencil_refs, stencil_vals, 814 s_pass_mask, front_facing); 815 } 816 817 /* Put Z and ztencil bits in the right place */ 818 if (z_dst && z_shift) { 819 LLVMValueRef shift = lp_build_const_int_vec(gallivm, z_type, z_shift); 820 z_dst = LLVMBuildShl(builder, z_dst, shift, ""); 821 } 822 if (stencil_vals && stencil_shift) 823 stencil_vals = LLVMBuildShl(builder, stencil_vals, 824 stencil_shift, ""); 825 826 /* Finally, merge/store the z/stencil values */ 827 if ((depth->enabled && depth->writemask) || 828 (stencil[0].enabled && stencil[0].writemask)) { 829 830 if (z_dst && stencil_vals) 831 zs_dst = LLVMBuildOr(builder, z_dst, stencil_vals, ""); 832 else if (z_dst) 833 zs_dst = z_dst; 834 else 835 zs_dst = stencil_vals; 836 837 *zs_value = zs_dst; 838 } 839 840 if (s_pass_mask) 841 lp_build_mask_update(mask, s_pass_mask); 842 843 if (depth->enabled && stencil[0].enabled) 844 lp_build_mask_update(mask, z_pass); 845 846 if (do_branch) 847 lp_build_mask_check(mask); 848 849 } 850 851 852 void 853 lp_build_depth_write(LLVMBuilderRef builder, 854 const struct util_format_description *format_desc, 855 LLVMValueRef zs_dst_ptr, 856 LLVMValueRef zs_value) 857 { 858 zs_dst_ptr = LLVMBuildBitCast(builder, zs_dst_ptr, 859 LLVMPointerType(LLVMTypeOf(zs_value), 0), ""); 860 861 LLVMBuildStore(builder, zs_value, zs_dst_ptr); 862 } 863 864 865 void 866 lp_build_deferred_depth_write(struct gallivm_state *gallivm, 867 struct lp_type z_src_type, 868 const struct util_format_description *format_desc, 869 struct lp_build_mask_context *mask, 870 LLVMValueRef zs_dst_ptr, 871 LLVMValueRef zs_value) 872 { 873 struct lp_type z_type; 874 struct lp_build_context z_bld; 875 LLVMValueRef z_dst; 876 LLVMBuilderRef builder = gallivm->builder; 877 878 /* XXX: pointlessly redo type logic: 879 */ 880 z_type = lp_depth_type(format_desc, z_src_type.width*z_src_type.length); 881 lp_build_context_init(&z_bld, gallivm, z_type); 882 883 zs_dst_ptr = LLVMBuildBitCast(builder, zs_dst_ptr, 884 LLVMPointerType(z_bld.vec_type, 0), ""); 885 886 z_dst = LLVMBuildLoad(builder, zs_dst_ptr, "zsbufval"); 887 z_dst = lp_build_select(&z_bld, lp_build_mask_value(mask), zs_value, z_dst); 888 889 LLVMBuildStore(builder, z_dst, zs_dst_ptr); 890 } 891
