1 /* 2 Copyright (C) Intel Corp. 2006. All Rights Reserved. 3 Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to 4 develop this 3D driver. 5 6 Permission is hereby granted, free of charge, to any person obtaining 7 a 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, sublicense, 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 16 portions of the Software. 17 18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 21 IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE 22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 26 **********************************************************************/ 27 /* 28 * Authors: 29 * Keith Whitwell <keith (at) tungstengraphics.com> 30 */ 31 32 #include "main/glheader.h" 33 #include "main/macros.h" 34 #include "main/enums.h" 35 #include "program/program.h" 36 37 #include "intel_batchbuffer.h" 38 39 #include "brw_defines.h" 40 #include "brw_context.h" 41 #include "brw_eu.h" 42 #include "brw_clip.h" 43 44 static void release_tmps( struct brw_clip_compile *c ) 45 { 46 c->last_tmp = c->first_tmp; 47 } 48 49 50 void brw_clip_tri_alloc_regs( struct brw_clip_compile *c, 51 GLuint nr_verts ) 52 { 53 struct intel_context *intel = &c->func.brw->intel; 54 GLuint i = 0,j; 55 56 /* Register usage is static, precompute here: 57 */ 58 c->reg.R0 = retype(brw_vec8_grf(i, 0), BRW_REGISTER_TYPE_UD); i++; 59 60 if (c->key.nr_userclip) { 61 c->reg.fixed_planes = brw_vec4_grf(i, 0); 62 i += (6 + c->key.nr_userclip + 1) / 2; 63 64 c->prog_data.curb_read_length = (6 + c->key.nr_userclip + 1) / 2; 65 } 66 else 67 c->prog_data.curb_read_length = 0; 68 69 70 /* Payload vertices plus space for more generated vertices: 71 */ 72 for (j = 0; j < nr_verts; j++) { 73 c->reg.vertex[j] = brw_vec4_grf(i, 0); 74 i += c->nr_regs; 75 } 76 77 if (c->vue_map.num_slots % 2) { 78 /* The VUE has an odd number of slots so the last register is only half 79 * used. Fill the second half with zero. 80 */ 81 for (j = 0; j < 3; j++) { 82 GLuint delta = brw_vue_slot_to_offset(c->vue_map.num_slots); 83 84 brw_MOV(&c->func, byte_offset(c->reg.vertex[j], delta), brw_imm_f(0)); 85 } 86 } 87 88 c->reg.t = brw_vec1_grf(i, 0); 89 c->reg.loopcount = retype(brw_vec1_grf(i, 1), BRW_REGISTER_TYPE_D); 90 c->reg.nr_verts = retype(brw_vec1_grf(i, 2), BRW_REGISTER_TYPE_UD); 91 c->reg.planemask = retype(brw_vec1_grf(i, 3), BRW_REGISTER_TYPE_UD); 92 c->reg.plane_equation = brw_vec4_grf(i, 4); 93 i++; 94 95 c->reg.dpPrev = brw_vec1_grf(i, 0); /* fixme - dp4 will clobber r.1,2,3 */ 96 c->reg.dp = brw_vec1_grf(i, 4); 97 i++; 98 99 c->reg.inlist = brw_uw16_reg(BRW_GENERAL_REGISTER_FILE, i, 0); 100 i++; 101 102 c->reg.outlist = brw_uw16_reg(BRW_GENERAL_REGISTER_FILE, i, 0); 103 i++; 104 105 c->reg.freelist = brw_uw16_reg(BRW_GENERAL_REGISTER_FILE, i, 0); 106 i++; 107 108 if (!c->key.nr_userclip) { 109 c->reg.fixed_planes = brw_vec8_grf(i, 0); 110 i++; 111 } 112 113 if (c->key.do_unfilled) { 114 c->reg.dir = brw_vec4_grf(i, 0); 115 c->reg.offset = brw_vec4_grf(i, 4); 116 i++; 117 c->reg.tmp0 = brw_vec4_grf(i, 0); 118 c->reg.tmp1 = brw_vec4_grf(i, 4); 119 i++; 120 } 121 122 if (intel->needs_ff_sync) { 123 c->reg.ff_sync = retype(brw_vec1_grf(i, 0), BRW_REGISTER_TYPE_UD); 124 i++; 125 } 126 127 c->first_tmp = i; 128 c->last_tmp = i; 129 130 c->prog_data.urb_read_length = c->nr_regs; /* ? */ 131 c->prog_data.total_grf = i; 132 } 133 134 135 136 void brw_clip_tri_init_vertices( struct brw_clip_compile *c ) 137 { 138 struct brw_compile *p = &c->func; 139 struct brw_reg tmp0 = c->reg.loopcount; /* handy temporary */ 140 141 /* Initial list of indices for incoming vertexes: 142 */ 143 brw_AND(p, tmp0, get_element_ud(c->reg.R0, 2), brw_imm_ud(PRIM_MASK)); 144 brw_CMP(p, 145 vec1(brw_null_reg()), 146 BRW_CONDITIONAL_EQ, 147 tmp0, 148 brw_imm_ud(_3DPRIM_TRISTRIP_REVERSE)); 149 150 /* XXX: Is there an easier way to do this? Need to reverse every 151 * second tristrip element: Can ignore sometimes? 152 */ 153 brw_IF(p, BRW_EXECUTE_1); 154 { 155 brw_MOV(p, get_element(c->reg.inlist, 0), brw_address(c->reg.vertex[1]) ); 156 brw_MOV(p, get_element(c->reg.inlist, 1), brw_address(c->reg.vertex[0]) ); 157 if (c->need_direction) 158 brw_MOV(p, c->reg.dir, brw_imm_f(-1)); 159 } 160 brw_ELSE(p); 161 { 162 brw_MOV(p, get_element(c->reg.inlist, 0), brw_address(c->reg.vertex[0]) ); 163 brw_MOV(p, get_element(c->reg.inlist, 1), brw_address(c->reg.vertex[1]) ); 164 if (c->need_direction) 165 brw_MOV(p, c->reg.dir, brw_imm_f(1)); 166 } 167 brw_ENDIF(p); 168 169 brw_MOV(p, get_element(c->reg.inlist, 2), brw_address(c->reg.vertex[2]) ); 170 brw_MOV(p, brw_vec8_grf(c->reg.outlist.nr, 0), brw_imm_f(0)); 171 brw_MOV(p, c->reg.nr_verts, brw_imm_ud(3)); 172 } 173 174 175 176 void brw_clip_tri_flat_shade( struct brw_clip_compile *c ) 177 { 178 struct brw_compile *p = &c->func; 179 struct brw_reg tmp0 = c->reg.loopcount; /* handy temporary */ 180 181 brw_AND(p, tmp0, get_element_ud(c->reg.R0, 2), brw_imm_ud(PRIM_MASK)); 182 brw_CMP(p, 183 vec1(brw_null_reg()), 184 BRW_CONDITIONAL_EQ, 185 tmp0, 186 brw_imm_ud(_3DPRIM_POLYGON)); 187 188 brw_IF(p, BRW_EXECUTE_1); 189 { 190 brw_clip_copy_colors(c, 1, 0); 191 brw_clip_copy_colors(c, 2, 0); 192 } 193 brw_ELSE(p); 194 { 195 if (c->key.pv_first) { 196 brw_CMP(p, 197 vec1(brw_null_reg()), 198 BRW_CONDITIONAL_EQ, 199 tmp0, 200 brw_imm_ud(_3DPRIM_TRIFAN)); 201 brw_IF(p, BRW_EXECUTE_1); 202 { 203 brw_clip_copy_colors(c, 0, 1); 204 brw_clip_copy_colors(c, 2, 1); 205 } 206 brw_ELSE(p); 207 { 208 brw_clip_copy_colors(c, 1, 0); 209 brw_clip_copy_colors(c, 2, 0); 210 } 211 brw_ENDIF(p); 212 } 213 else { 214 brw_clip_copy_colors(c, 0, 2); 215 brw_clip_copy_colors(c, 1, 2); 216 } 217 } 218 brw_ENDIF(p); 219 } 220 221 222 223 /* Use mesa's clipping algorithms, translated to GEN4 assembly. 224 */ 225 void brw_clip_tri( struct brw_clip_compile *c ) 226 { 227 struct brw_compile *p = &c->func; 228 struct brw_indirect vtx = brw_indirect(0, 0); 229 struct brw_indirect vtxPrev = brw_indirect(1, 0); 230 struct brw_indirect vtxOut = brw_indirect(2, 0); 231 struct brw_indirect plane_ptr = brw_indirect(3, 0); 232 struct brw_indirect inlist_ptr = brw_indirect(4, 0); 233 struct brw_indirect outlist_ptr = brw_indirect(5, 0); 234 struct brw_indirect freelist_ptr = brw_indirect(6, 0); 235 GLuint hpos_offset = brw_vert_result_to_offset(&c->vue_map, 236 VERT_RESULT_HPOS); 237 238 brw_MOV(p, get_addr_reg(vtxPrev), brw_address(c->reg.vertex[2]) ); 239 brw_MOV(p, get_addr_reg(plane_ptr), brw_clip_plane0_address(c)); 240 brw_MOV(p, get_addr_reg(inlist_ptr), brw_address(c->reg.inlist)); 241 brw_MOV(p, get_addr_reg(outlist_ptr), brw_address(c->reg.outlist)); 242 243 brw_MOV(p, get_addr_reg(freelist_ptr), brw_address(c->reg.vertex[3]) ); 244 245 brw_DO(p, BRW_EXECUTE_1); 246 { 247 /* if (planemask & 1) 248 */ 249 brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ); 250 brw_AND(p, vec1(brw_null_reg()), c->reg.planemask, brw_imm_ud(1)); 251 252 brw_IF(p, BRW_EXECUTE_1); 253 { 254 /* vtxOut = freelist_ptr++ 255 */ 256 brw_MOV(p, get_addr_reg(vtxOut), get_addr_reg(freelist_ptr) ); 257 brw_ADD(p, get_addr_reg(freelist_ptr), get_addr_reg(freelist_ptr), brw_imm_uw(c->nr_regs * REG_SIZE)); 258 259 if (c->key.nr_userclip) 260 brw_MOV(p, c->reg.plane_equation, deref_4f(plane_ptr, 0)); 261 else 262 brw_MOV(p, c->reg.plane_equation, deref_4b(plane_ptr, 0)); 263 264 brw_MOV(p, c->reg.loopcount, c->reg.nr_verts); 265 brw_MOV(p, c->reg.nr_verts, brw_imm_ud(0)); 266 267 brw_DO(p, BRW_EXECUTE_1); 268 { 269 /* vtx = *input_ptr; 270 */ 271 brw_MOV(p, get_addr_reg(vtx), deref_1uw(inlist_ptr, 0)); 272 273 /* IS_NEGATIVE(prev) */ 274 brw_set_conditionalmod(p, BRW_CONDITIONAL_L); 275 brw_DP4(p, vec4(c->reg.dpPrev), deref_4f(vtxPrev, hpos_offset), c->reg.plane_equation); 276 brw_IF(p, BRW_EXECUTE_1); 277 { 278 /* IS_POSITIVE(next) 279 */ 280 brw_set_conditionalmod(p, BRW_CONDITIONAL_GE); 281 brw_DP4(p, vec4(c->reg.dp), deref_4f(vtx, hpos_offset), c->reg.plane_equation); 282 brw_IF(p, BRW_EXECUTE_1); 283 { 284 285 /* Coming back in. 286 */ 287 brw_ADD(p, c->reg.t, c->reg.dpPrev, negate(c->reg.dp)); 288 brw_math_invert(p, c->reg.t, c->reg.t); 289 brw_MUL(p, c->reg.t, c->reg.t, c->reg.dpPrev); 290 291 /* If (vtxOut == 0) vtxOut = vtxPrev 292 */ 293 brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_EQ, get_addr_reg(vtxOut), brw_imm_uw(0) ); 294 brw_MOV(p, get_addr_reg(vtxOut), get_addr_reg(vtxPrev) ); 295 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 296 297 brw_clip_interp_vertex(c, vtxOut, vtxPrev, vtx, c->reg.t, false); 298 299 /* *outlist_ptr++ = vtxOut; 300 * nr_verts++; 301 * vtxOut = 0; 302 */ 303 brw_MOV(p, deref_1uw(outlist_ptr, 0), get_addr_reg(vtxOut)); 304 brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_uw(sizeof(short))); 305 brw_ADD(p, c->reg.nr_verts, c->reg.nr_verts, brw_imm_ud(1)); 306 brw_MOV(p, get_addr_reg(vtxOut), brw_imm_uw(0) ); 307 } 308 brw_ENDIF(p); 309 310 } 311 brw_ELSE(p); 312 { 313 /* *outlist_ptr++ = vtxPrev; 314 * nr_verts++; 315 */ 316 brw_MOV(p, deref_1uw(outlist_ptr, 0), get_addr_reg(vtxPrev)); 317 brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_uw(sizeof(short))); 318 brw_ADD(p, c->reg.nr_verts, c->reg.nr_verts, brw_imm_ud(1)); 319 320 /* IS_NEGATIVE(next) 321 */ 322 brw_set_conditionalmod(p, BRW_CONDITIONAL_L); 323 brw_DP4(p, vec4(c->reg.dp), deref_4f(vtx, hpos_offset), c->reg.plane_equation); 324 brw_IF(p, BRW_EXECUTE_1); 325 { 326 /* Going out of bounds. Avoid division by zero as we 327 * know dp != dpPrev from DIFFERENT_SIGNS, above. 328 */ 329 brw_ADD(p, c->reg.t, c->reg.dp, negate(c->reg.dpPrev)); 330 brw_math_invert(p, c->reg.t, c->reg.t); 331 brw_MUL(p, c->reg.t, c->reg.t, c->reg.dp); 332 333 /* If (vtxOut == 0) vtxOut = vtx 334 */ 335 brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_EQ, get_addr_reg(vtxOut), brw_imm_uw(0) ); 336 brw_MOV(p, get_addr_reg(vtxOut), get_addr_reg(vtx) ); 337 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 338 339 brw_clip_interp_vertex(c, vtxOut, vtx, vtxPrev, c->reg.t, true); 340 341 /* *outlist_ptr++ = vtxOut; 342 * nr_verts++; 343 * vtxOut = 0; 344 */ 345 brw_MOV(p, deref_1uw(outlist_ptr, 0), get_addr_reg(vtxOut)); 346 brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_uw(sizeof(short))); 347 brw_ADD(p, c->reg.nr_verts, c->reg.nr_verts, brw_imm_ud(1)); 348 brw_MOV(p, get_addr_reg(vtxOut), brw_imm_uw(0) ); 349 } 350 brw_ENDIF(p); 351 } 352 brw_ENDIF(p); 353 354 /* vtxPrev = vtx; 355 * inlist_ptr++; 356 */ 357 brw_MOV(p, get_addr_reg(vtxPrev), get_addr_reg(vtx)); 358 brw_ADD(p, get_addr_reg(inlist_ptr), get_addr_reg(inlist_ptr), brw_imm_uw(sizeof(short))); 359 360 /* while (--loopcount != 0) 361 */ 362 brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ); 363 brw_ADD(p, c->reg.loopcount, c->reg.loopcount, brw_imm_d(-1)); 364 } 365 brw_WHILE(p); 366 367 /* vtxPrev = *(outlist_ptr-1) OR: outlist[nr_verts-1] 368 * inlist = outlist 369 * inlist_ptr = &inlist[0] 370 * outlist_ptr = &outlist[0] 371 */ 372 brw_ADD(p, get_addr_reg(outlist_ptr), get_addr_reg(outlist_ptr), brw_imm_w(-2)); 373 brw_MOV(p, get_addr_reg(vtxPrev), deref_1uw(outlist_ptr, 0)); 374 brw_MOV(p, brw_vec8_grf(c->reg.inlist.nr, 0), brw_vec8_grf(c->reg.outlist.nr, 0)); 375 brw_MOV(p, get_addr_reg(inlist_ptr), brw_address(c->reg.inlist)); 376 brw_MOV(p, get_addr_reg(outlist_ptr), brw_address(c->reg.outlist)); 377 } 378 brw_ENDIF(p); 379 380 /* plane_ptr++; 381 */ 382 brw_ADD(p, get_addr_reg(plane_ptr), get_addr_reg(plane_ptr), brw_clip_plane_stride(c)); 383 384 /* nr_verts >= 3 385 */ 386 brw_CMP(p, 387 vec1(brw_null_reg()), 388 BRW_CONDITIONAL_GE, 389 c->reg.nr_verts, 390 brw_imm_ud(3)); 391 392 /* && (planemask>>=1) != 0 393 */ 394 brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ); 395 brw_SHR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud(1)); 396 } 397 brw_WHILE(p); 398 } 399 400 401 402 void brw_clip_tri_emit_polygon(struct brw_clip_compile *c) 403 { 404 struct brw_compile *p = &c->func; 405 406 /* for (loopcount = nr_verts-2; loopcount > 0; loopcount--) 407 */ 408 brw_set_conditionalmod(p, BRW_CONDITIONAL_G); 409 brw_ADD(p, 410 c->reg.loopcount, 411 c->reg.nr_verts, 412 brw_imm_d(-2)); 413 414 brw_IF(p, BRW_EXECUTE_1); 415 { 416 struct brw_indirect v0 = brw_indirect(0, 0); 417 struct brw_indirect vptr = brw_indirect(1, 0); 418 419 brw_MOV(p, get_addr_reg(vptr), brw_address(c->reg.inlist)); 420 brw_MOV(p, get_addr_reg(v0), deref_1uw(vptr, 0)); 421 422 brw_clip_emit_vue(c, v0, 1, 0, 423 ((_3DPRIM_TRIFAN << URB_WRITE_PRIM_TYPE_SHIFT) 424 | URB_WRITE_PRIM_START)); 425 426 brw_ADD(p, get_addr_reg(vptr), get_addr_reg(vptr), brw_imm_uw(2)); 427 brw_MOV(p, get_addr_reg(v0), deref_1uw(vptr, 0)); 428 429 brw_DO(p, BRW_EXECUTE_1); 430 { 431 brw_clip_emit_vue(c, v0, 1, 0, 432 (_3DPRIM_TRIFAN << URB_WRITE_PRIM_TYPE_SHIFT)); 433 434 brw_ADD(p, get_addr_reg(vptr), get_addr_reg(vptr), brw_imm_uw(2)); 435 brw_MOV(p, get_addr_reg(v0), deref_1uw(vptr, 0)); 436 437 brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ); 438 brw_ADD(p, c->reg.loopcount, c->reg.loopcount, brw_imm_d(-1)); 439 } 440 brw_WHILE(p); 441 442 brw_clip_emit_vue(c, v0, 0, 1, 443 ((_3DPRIM_TRIFAN << URB_WRITE_PRIM_TYPE_SHIFT) 444 | URB_WRITE_PRIM_END)); 445 } 446 brw_ENDIF(p); 447 } 448 449 static void do_clip_tri( struct brw_clip_compile *c ) 450 { 451 brw_clip_init_planes(c); 452 453 brw_clip_tri(c); 454 } 455 456 457 static void maybe_do_clip_tri( struct brw_clip_compile *c ) 458 { 459 struct brw_compile *p = &c->func; 460 461 brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_NZ, c->reg.planemask, brw_imm_ud(0)); 462 brw_IF(p, BRW_EXECUTE_1); 463 { 464 do_clip_tri(c); 465 } 466 brw_ENDIF(p); 467 } 468 469 static void brw_clip_test( struct brw_clip_compile *c ) 470 { 471 struct brw_reg t = retype(get_tmp(c), BRW_REGISTER_TYPE_UD); 472 struct brw_reg t1 = retype(get_tmp(c), BRW_REGISTER_TYPE_UD); 473 struct brw_reg t2 = retype(get_tmp(c), BRW_REGISTER_TYPE_UD); 474 struct brw_reg t3 = retype(get_tmp(c), BRW_REGISTER_TYPE_UD); 475 476 struct brw_reg v0 = get_tmp(c); 477 struct brw_reg v1 = get_tmp(c); 478 struct brw_reg v2 = get_tmp(c); 479 480 struct brw_indirect vt0 = brw_indirect(0, 0); 481 struct brw_indirect vt1 = brw_indirect(1, 0); 482 struct brw_indirect vt2 = brw_indirect(2, 0); 483 484 struct brw_compile *p = &c->func; 485 struct brw_reg tmp0 = c->reg.loopcount; /* handy temporary */ 486 487 GLuint hpos_offset = brw_vert_result_to_offset(&c->vue_map, 488 VERT_RESULT_HPOS); 489 490 brw_MOV(p, get_addr_reg(vt0), brw_address(c->reg.vertex[0])); 491 brw_MOV(p, get_addr_reg(vt1), brw_address(c->reg.vertex[1])); 492 brw_MOV(p, get_addr_reg(vt2), brw_address(c->reg.vertex[2])); 493 brw_MOV(p, v0, deref_4f(vt0, hpos_offset)); 494 brw_MOV(p, v1, deref_4f(vt1, hpos_offset)); 495 brw_MOV(p, v2, deref_4f(vt2, hpos_offset)); 496 brw_AND(p, c->reg.planemask, c->reg.planemask, brw_imm_ud(~0x3f)); 497 498 /* test nearz, xmin, ymin plane */ 499 /* clip.xyz < -clip.w */ 500 brw_CMP(p, t1, BRW_CONDITIONAL_L, v0, negate(get_element(v0, 3))); 501 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 502 brw_CMP(p, t2, BRW_CONDITIONAL_L, v1, negate(get_element(v1, 3))); 503 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 504 brw_CMP(p, t3, BRW_CONDITIONAL_L, v2, negate(get_element(v2, 3))); 505 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 506 507 /* All vertices are outside of a plane, rejected */ 508 brw_AND(p, t, t1, t2); 509 brw_AND(p, t, t, t3); 510 brw_OR(p, tmp0, get_element(t, 0), get_element(t, 1)); 511 brw_OR(p, tmp0, tmp0, get_element(t, 2)); 512 brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ); 513 brw_AND(p, brw_null_reg(), tmp0, brw_imm_ud(0x1)); 514 brw_IF(p, BRW_EXECUTE_1); 515 { 516 brw_clip_kill_thread(c); 517 } 518 brw_ENDIF(p); 519 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 520 521 /* some vertices are inside a plane, some are outside,need to clip */ 522 brw_XOR(p, t, t1, t2); 523 brw_XOR(p, t1, t2, t3); 524 brw_OR(p, t, t, t1); 525 brw_AND(p, t, t, brw_imm_ud(0x1)); 526 brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ, 527 get_element(t, 0), brw_imm_ud(0)); 528 brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<5))); 529 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 530 brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ, 531 get_element(t, 1), brw_imm_ud(0)); 532 brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<3))); 533 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 534 brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ, 535 get_element(t, 2), brw_imm_ud(0)); 536 brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<1))); 537 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 538 539 /* test farz, xmax, ymax plane */ 540 /* clip.xyz > clip.w */ 541 brw_CMP(p, t1, BRW_CONDITIONAL_G, v0, get_element(v0, 3)); 542 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 543 brw_CMP(p, t2, BRW_CONDITIONAL_G, v1, get_element(v1, 3)); 544 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 545 brw_CMP(p, t3, BRW_CONDITIONAL_G, v2, get_element(v2, 3)); 546 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 547 548 /* All vertices are outside of a plane, rejected */ 549 brw_AND(p, t, t1, t2); 550 brw_AND(p, t, t, t3); 551 brw_OR(p, tmp0, get_element(t, 0), get_element(t, 1)); 552 brw_OR(p, tmp0, tmp0, get_element(t, 2)); 553 brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ); 554 brw_AND(p, brw_null_reg(), tmp0, brw_imm_ud(0x1)); 555 brw_IF(p, BRW_EXECUTE_1); 556 { 557 brw_clip_kill_thread(c); 558 } 559 brw_ENDIF(p); 560 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 561 562 /* some vertices are inside a plane, some are outside,need to clip */ 563 brw_XOR(p, t, t1, t2); 564 brw_XOR(p, t1, t2, t3); 565 brw_OR(p, t, t, t1); 566 brw_AND(p, t, t, brw_imm_ud(0x1)); 567 brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ, 568 get_element(t, 0), brw_imm_ud(0)); 569 brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<4))); 570 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 571 brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ, 572 get_element(t, 1), brw_imm_ud(0)); 573 brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<2))); 574 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 575 brw_CMP(p, brw_null_reg(), BRW_CONDITIONAL_NZ, 576 get_element(t, 2), brw_imm_ud(0)); 577 brw_OR(p, c->reg.planemask, c->reg.planemask, brw_imm_ud((1<<0))); 578 brw_set_predicate_control(p, BRW_PREDICATE_NONE); 579 580 release_tmps(c); 581 } 582 583 584 void brw_emit_tri_clip( struct brw_clip_compile *c ) 585 { 586 struct brw_compile *p = &c->func; 587 struct brw_context *brw = p->brw; 588 brw_clip_tri_alloc_regs(c, 3 + c->key.nr_userclip + 6); 589 brw_clip_tri_init_vertices(c); 590 brw_clip_init_clipmask(c); 591 brw_clip_init_ff_sync(c); 592 593 /* if -ve rhw workaround bit is set, 594 do cliptest */ 595 if (brw->has_negative_rhw_bug) { 596 brw_set_conditionalmod(p, BRW_CONDITIONAL_NZ); 597 brw_AND(p, brw_null_reg(), get_element_ud(c->reg.R0, 2), 598 brw_imm_ud(1<<20)); 599 brw_IF(p, BRW_EXECUTE_1); 600 { 601 brw_clip_test(c); 602 } 603 brw_ENDIF(p); 604 } 605 /* Can't push into do_clip_tri because with polygon (or quad) 606 * flatshading, need to apply the flatshade here because we don't 607 * respect the PV when converting to trifan for emit: 608 */ 609 if (c->key.do_flat_shading) 610 brw_clip_tri_flat_shade(c); 611 612 if ((c->key.clip_mode == BRW_CLIPMODE_NORMAL) || 613 (c->key.clip_mode == BRW_CLIPMODE_KERNEL_CLIP)) 614 do_clip_tri(c); 615 else 616 maybe_do_clip_tri(c); 617 618 brw_clip_tri_emit_polygon(c); 619 620 /* Send an empty message to kill the thread: 621 */ 622 brw_clip_kill_thread(c); 623 } 624
