draw_pipe_pstipple.c revision eb979cef8535914f428d2462e78f713da558fc18
1/************************************************************************** 2 * 3 * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas. 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 TUNGSTEN GRAPHICS 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 * Polygon stipple stage: implement polygon stipple with texture map and 30 * fragment program. The fragment program samples the texture and does 31 * a fragment kill for the stipple-failing fragments. 32 * 33 * Authors: Brian Paul 34 */ 35 36 37#include "pipe/p_context.h" 38#include "pipe/p_defines.h" 39#include "pipe/p_shader_tokens.h" 40 41#include "util/u_math.h" 42#include "util/u_memory.h" 43 44#include "tgsi/tgsi_transform.h" 45#include "tgsi/tgsi_dump.h" 46 47#include "draw_context.h" 48#include "draw_pipe.h" 49 50 51 52/** 53 * Subclass of pipe_shader_state to carry extra fragment shader info. 54 */ 55struct pstip_fragment_shader 56{ 57 struct pipe_shader_state state; 58 void *driver_fs; 59 void *pstip_fs; 60 uint sampler_unit; 61}; 62 63 64/** 65 * Subclass of draw_stage 66 */ 67struct pstip_stage 68{ 69 struct draw_stage stage; 70 71 void *sampler_cso; 72 struct pipe_texture *texture; 73 uint num_samplers; 74 uint num_textures; 75 76 /* 77 * Currently bound state 78 */ 79 struct pstip_fragment_shader *fs; 80 struct { 81 void *samplers[PIPE_MAX_SAMPLERS]; 82 struct pipe_texture *textures[PIPE_MAX_SAMPLERS]; 83 const struct pipe_poly_stipple *stipple; 84 } state; 85 86 /* 87 * Driver interface/override functions 88 */ 89 void * (*driver_create_fs_state)(struct pipe_context *, 90 const struct pipe_shader_state *); 91 void (*driver_bind_fs_state)(struct pipe_context *, void *); 92 void (*driver_delete_fs_state)(struct pipe_context *, void *); 93 94 void (*driver_bind_sampler_states)(struct pipe_context *, unsigned, void **); 95 96 void (*driver_set_sampler_textures)(struct pipe_context *, unsigned, 97 struct pipe_texture **); 98 99 void (*driver_set_polygon_stipple)(struct pipe_context *, 100 const struct pipe_poly_stipple *); 101 102 struct pipe_context *pipe; 103}; 104 105 106 107/** 108 * Subclass of tgsi_transform_context, used for transforming the 109 * user's fragment shader to add the special AA instructions. 110 */ 111struct pstip_transform_context { 112 struct tgsi_transform_context base; 113 uint tempsUsed; /**< bitmask */ 114 int wincoordInput; 115 int maxInput; 116 uint samplersUsed; /**< bitfield of samplers used */ 117 int freeSampler; /** an available sampler for the pstipple */ 118 int texTemp; /**< temp registers */ 119 int numImmed; 120 boolean firstInstruction; 121}; 122 123 124/** 125 * TGSI declaration transform callback. 126 * Look for a free sampler, a free input attrib, and two free temp regs. 127 */ 128static void 129pstip_transform_decl(struct tgsi_transform_context *ctx, 130 struct tgsi_full_declaration *decl) 131{ 132 struct pstip_transform_context *pctx = (struct pstip_transform_context *) ctx; 133 134 if (decl->Declaration.File == TGSI_FILE_SAMPLER) { 135 uint i; 136 for (i = decl->DeclarationRange.First; 137 i <= decl->DeclarationRange.Last; i++) { 138 pctx->samplersUsed |= 1 << i; 139 } 140 } 141 else if (decl->Declaration.File == TGSI_FILE_INPUT) { 142 pctx->maxInput = MAX2(pctx->maxInput, (int) decl->DeclarationRange.Last); 143 if (decl->Semantic.SemanticName == TGSI_SEMANTIC_POSITION) 144 pctx->wincoordInput = (int) decl->DeclarationRange.First; 145 } 146 else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) { 147 uint i; 148 for (i = decl->DeclarationRange.First; 149 i <= decl->DeclarationRange.Last; i++) { 150 pctx->tempsUsed |= (1 << i); 151 } 152 } 153 154 ctx->emit_declaration(ctx, decl); 155} 156 157 158static void 159pstip_transform_immed(struct tgsi_transform_context *ctx, 160 struct tgsi_full_immediate *immed) 161{ 162 struct pstip_transform_context *pctx = (struct pstip_transform_context *) ctx; 163 pctx->numImmed++; 164} 165 166 167/** 168 * Find the lowest zero bit in the given word, or -1 if bitfield is all ones. 169 */ 170static int 171free_bit(uint bitfield) 172{ 173 int i; 174 for (i = 0; i < 32; i++) { 175 if ((bitfield & (1 << i)) == 0) 176 return i; 177 } 178 return -1; 179} 180 181 182/** 183 * TGSI instruction transform callback. 184 * Replace writes to result.color w/ a temp reg. 185 * Upon END instruction, insert texture sampling code for antialiasing. 186 */ 187static void 188pstip_transform_inst(struct tgsi_transform_context *ctx, 189 struct tgsi_full_instruction *inst) 190{ 191 struct pstip_transform_context *pctx = (struct pstip_transform_context *) ctx; 192 193 if (pctx->firstInstruction) { 194 /* emit our new declarations before the first instruction */ 195 196 struct tgsi_full_declaration decl; 197 struct tgsi_full_instruction newInst; 198 uint i; 199 int wincoordInput; 200 201 /* find free sampler */ 202 pctx->freeSampler = free_bit(pctx->samplersUsed); 203 if (pctx->freeSampler >= PIPE_MAX_SAMPLERS) 204 pctx->freeSampler = PIPE_MAX_SAMPLERS - 1; 205 206 if (pctx->wincoordInput < 0) 207 wincoordInput = pctx->maxInput + 1; 208 else 209 wincoordInput = pctx->wincoordInput; 210 211 /* find one free temp reg */ 212 for (i = 0; i < 32; i++) { 213 if ((pctx->tempsUsed & (1 << i)) == 0) { 214 /* found a free temp */ 215 if (pctx->texTemp < 0) 216 pctx->texTemp = i; 217 else 218 break; 219 } 220 } 221 assert(pctx->texTemp >= 0); 222 223 if (pctx->wincoordInput < 0) { 224 /* declare new position input reg */ 225 decl = tgsi_default_full_declaration(); 226 decl.Declaration.File = TGSI_FILE_INPUT; 227 decl.Declaration.Interpolate = TGSI_INTERPOLATE_LINEAR; /* XXX? */ 228 decl.Declaration.Semantic = 1; 229 decl.Semantic.SemanticName = TGSI_SEMANTIC_POSITION; 230 decl.Semantic.SemanticIndex = 0; 231 decl.DeclarationRange.First = 232 decl.DeclarationRange.Last = wincoordInput; 233 ctx->emit_declaration(ctx, &decl); 234 } 235 236 /* declare new sampler */ 237 decl = tgsi_default_full_declaration(); 238 decl.Declaration.File = TGSI_FILE_SAMPLER; 239 decl.DeclarationRange.First = 240 decl.DeclarationRange.Last = pctx->freeSampler; 241 ctx->emit_declaration(ctx, &decl); 242 243 /* declare new temp regs */ 244 decl = tgsi_default_full_declaration(); 245 decl.Declaration.File = TGSI_FILE_TEMPORARY; 246 decl.DeclarationRange.First = 247 decl.DeclarationRange.Last = pctx->texTemp; 248 ctx->emit_declaration(ctx, &decl); 249 250 /* emit immediate = {1/32, 1/32, 1, 1} 251 * The index/position of this immediate will be pctx->numImmed 252 */ 253 { 254 static const float value[4] = { 1.0/32, 1.0/32, 1.0, 1.0 }; 255 struct tgsi_full_immediate immed; 256 uint size = 4; 257 immed = tgsi_default_full_immediate(); 258 immed.Immediate.NrTokens = 1 + size; /* one for the token itself */ 259 immed.u.Pointer = (void *) value; 260 ctx->emit_immediate(ctx, &immed); 261 } 262 263 pctx->firstInstruction = FALSE; 264 265 266 /* 267 * Insert new MUL/TEX/KILP instructions at start of program 268 * Take gl_FragCoord, divide by 32 (stipple size), sample the 269 * texture and kill fragment if needed. 270 * 271 * We'd like to use non-normalized texcoords to index into a RECT 272 * texture, but we can only use GL_REPEAT wrap mode with normalized 273 * texcoords. Darn. 274 */ 275 276 /* MUL texTemp, INPUT[wincoord], 1/32; */ 277 newInst = tgsi_default_full_instruction(); 278 newInst.Instruction.Opcode = TGSI_OPCODE_MUL; 279 newInst.Instruction.NumDstRegs = 1; 280 newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY; 281 newInst.FullDstRegisters[0].DstRegister.Index = pctx->texTemp; 282 newInst.Instruction.NumSrcRegs = 2; 283 newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_INPUT; 284 newInst.FullSrcRegisters[0].SrcRegister.Index = wincoordInput; 285 newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_IMMEDIATE; 286 newInst.FullSrcRegisters[1].SrcRegister.Index = pctx->numImmed; 287 ctx->emit_instruction(ctx, &newInst); 288 289 /* TEX texTemp, texTemp, sampler; */ 290 newInst = tgsi_default_full_instruction(); 291 newInst.Instruction.Opcode = TGSI_OPCODE_TEX; 292 newInst.Instruction.NumDstRegs = 1; 293 newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY; 294 newInst.FullDstRegisters[0].DstRegister.Index = pctx->texTemp; 295 newInst.Instruction.NumSrcRegs = 2; 296 newInst.InstructionExtTexture.Texture = TGSI_TEXTURE_2D; 297 newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY; 298 newInst.FullSrcRegisters[0].SrcRegister.Index = pctx->texTemp; 299 newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_SAMPLER; 300 newInst.FullSrcRegisters[1].SrcRegister.Index = pctx->freeSampler; 301 ctx->emit_instruction(ctx, &newInst); 302 303 /* KIL -texTemp; # if -texTemp < 0, KILL fragment */ 304 newInst = tgsi_default_full_instruction(); 305 newInst.Instruction.Opcode = TGSI_OPCODE_KIL; 306 newInst.Instruction.NumDstRegs = 0; 307 newInst.Instruction.NumSrcRegs = 1; 308 newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY; 309 newInst.FullSrcRegisters[0].SrcRegister.Index = pctx->texTemp; 310 newInst.FullSrcRegisters[0].SrcRegister.Negate = 1; 311 ctx->emit_instruction(ctx, &newInst); 312 } 313 314 /* emit this instruction */ 315 ctx->emit_instruction(ctx, inst); 316} 317 318 319/** 320 * Generate the frag shader we'll use for doing polygon stipple. 321 * This will be the user's shader prefixed with a TEX and KIL instruction. 322 */ 323static boolean 324generate_pstip_fs(struct pstip_stage *pstip) 325{ 326 const struct pipe_shader_state *orig_fs = &pstip->fs->state; 327 /*struct draw_context *draw = pstip->stage.draw;*/ 328 struct pipe_shader_state pstip_fs; 329 struct pstip_transform_context transform; 330 331#define MAX 1000 332 333 pstip_fs = *orig_fs; /* copy to init */ 334 pstip_fs.tokens = MALLOC(sizeof(struct tgsi_token) * MAX); 335 if (pstip_fs.tokens == NULL) 336 return FALSE; 337 338 memset(&transform, 0, sizeof(transform)); 339 transform.wincoordInput = -1; 340 transform.maxInput = -1; 341 transform.texTemp = -1; 342 transform.firstInstruction = TRUE; 343 transform.base.transform_instruction = pstip_transform_inst; 344 transform.base.transform_declaration = pstip_transform_decl; 345 transform.base.transform_immediate = pstip_transform_immed; 346 347 tgsi_transform_shader(orig_fs->tokens, 348 (struct tgsi_token *) pstip_fs.tokens, 349 MAX, &transform.base); 350 351#if 0 /* DEBUG */ 352 tgsi_dump(orig_fs->tokens, 0); 353 tgsi_dump(pstip_fs.tokens, 0); 354#endif 355 356 pstip->fs->sampler_unit = transform.freeSampler; 357 assert(pstip->fs->sampler_unit < PIPE_MAX_SAMPLERS); 358 359 pstip->fs->pstip_fs = pstip->driver_create_fs_state(pstip->pipe, &pstip_fs); 360 361 return TRUE; 362} 363 364 365/** 366 * Load texture image with current stipple pattern. 367 */ 368static void 369pstip_update_texture(struct pstip_stage *pstip) 370{ 371 static const uint bit31 = 1 << 31; 372 struct pipe_context *pipe = pstip->pipe; 373 struct pipe_screen *screen = pipe->screen; 374 struct pipe_transfer *transfer; 375 const uint *stipple = pstip->state.stipple->stipple; 376 uint i, j; 377 ubyte *data; 378 379 /* XXX: want to avoid flushing just because we use stipple: 380 */ 381 pipe->flush( pipe, PIPE_FLUSH_TEXTURE_CACHE, NULL ); 382 383 transfer = screen->get_tex_transfer(screen, pstip->texture, 0, 0, 0, 384 PIPE_TRANSFER_WRITE, 0, 0, 32, 32); 385 data = screen->transfer_map(screen, transfer); 386 387 /* 388 * Load alpha texture. 389 * Note: 0 means keep the fragment, 255 means kill it. 390 * We'll negate the texel value and use KILP which kills if value 391 * is negative. 392 */ 393 for (i = 0; i < 32; i++) { 394 for (j = 0; j < 32; j++) { 395 if (stipple[i] & (bit31 >> j)) { 396 /* fragment "on" */ 397 data[i * transfer->stride + j] = 0; 398 } 399 else { 400 /* fragment "off" */ 401 data[i * transfer->stride + j] = 255; 402 } 403 } 404 } 405 406 /* unmap */ 407 screen->transfer_unmap(screen, transfer); 408 screen->tex_transfer_destroy(transfer); 409} 410 411 412/** 413 * Create the texture map we'll use for stippling. 414 */ 415static boolean 416pstip_create_texture(struct pstip_stage *pstip) 417{ 418 struct pipe_context *pipe = pstip->pipe; 419 struct pipe_screen *screen = pipe->screen; 420 struct pipe_texture texTemp; 421 422 memset(&texTemp, 0, sizeof(texTemp)); 423 texTemp.target = PIPE_TEXTURE_2D; 424 texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */ 425 texTemp.last_level = 0; 426 texTemp.width[0] = 32; 427 texTemp.height[0] = 32; 428 texTemp.depth[0] = 1; 429 pf_get_block(texTemp.format, &texTemp.block); 430 431 pstip->texture = screen->texture_create(screen, &texTemp); 432 if (pstip->texture == NULL) 433 return FALSE; 434 435 return TRUE; 436} 437 438 439/** 440 * Create the sampler CSO that'll be used for stippling. 441 */ 442static boolean 443pstip_create_sampler(struct pstip_stage *pstip) 444{ 445 struct pipe_sampler_state sampler; 446 struct pipe_context *pipe = pstip->pipe; 447 448 memset(&sampler, 0, sizeof(sampler)); 449 sampler.wrap_s = PIPE_TEX_WRAP_REPEAT; 450 sampler.wrap_t = PIPE_TEX_WRAP_REPEAT; 451 sampler.wrap_r = PIPE_TEX_WRAP_REPEAT; 452 sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE; 453 sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST; 454 sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST; 455 sampler.normalized_coords = 1; 456 sampler.min_lod = 0.0f; 457 sampler.max_lod = 0.0f; 458 459 pstip->sampler_cso = pipe->create_sampler_state(pipe, &sampler); 460 if (pstip->sampler_cso == NULL) 461 return FALSE; 462 463 return TRUE; 464} 465 466 467/** 468 * When we're about to draw our first stipple polygon in a batch, this function 469 * is called to tell the driver to bind our modified fragment shader. 470 */ 471static boolean 472bind_pstip_fragment_shader(struct pstip_stage *pstip) 473{ 474 struct draw_context *draw = pstip->stage.draw; 475 if (!pstip->fs->pstip_fs && 476 !generate_pstip_fs(pstip)) 477 return FALSE; 478 479 draw->suspend_flushing = TRUE; 480 pstip->driver_bind_fs_state(pstip->pipe, pstip->fs->pstip_fs); 481 draw->suspend_flushing = FALSE; 482 return TRUE; 483} 484 485 486static INLINE struct pstip_stage * 487pstip_stage( struct draw_stage *stage ) 488{ 489 return (struct pstip_stage *) stage; 490} 491 492 493static void 494pstip_first_tri(struct draw_stage *stage, struct prim_header *header) 495{ 496 struct pstip_stage *pstip = pstip_stage(stage); 497 struct pipe_context *pipe = pstip->pipe; 498 struct draw_context *draw = stage->draw; 499 uint num_samplers; 500 501 assert(stage->draw->rasterizer->poly_stipple_enable); 502 503 /* bind our fragprog */ 504 if (!bind_pstip_fragment_shader(pstip)) { 505 stage->tri = draw_pipe_passthrough_tri; 506 stage->tri(stage, header); 507 return; 508 } 509 510 511 /* how many samplers? */ 512 /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */ 513 num_samplers = MAX2(pstip->num_textures, pstip->num_samplers); 514 num_samplers = MAX2(num_samplers, pstip->fs->sampler_unit + 1); 515 516 /* plug in our sampler, texture */ 517 pstip->state.samplers[pstip->fs->sampler_unit] = pstip->sampler_cso; 518 pipe_texture_reference(&pstip->state.textures[pstip->fs->sampler_unit], 519 pstip->texture); 520 521 assert(num_samplers <= PIPE_MAX_SAMPLERS); 522 523 draw->suspend_flushing = TRUE; 524 pstip->driver_bind_sampler_states(pipe, num_samplers, pstip->state.samplers); 525 pstip->driver_set_sampler_textures(pipe, num_samplers, pstip->state.textures); 526 draw->suspend_flushing = FALSE; 527 528 /* now really draw first triangle */ 529 stage->tri = draw_pipe_passthrough_tri; 530 stage->tri(stage, header); 531} 532 533 534static void 535pstip_flush(struct draw_stage *stage, unsigned flags) 536{ 537 struct draw_context *draw = stage->draw; 538 struct pstip_stage *pstip = pstip_stage(stage); 539 struct pipe_context *pipe = pstip->pipe; 540 541 stage->tri = pstip_first_tri; 542 stage->next->flush( stage->next, flags ); 543 544 /* restore original frag shader, texture, sampler state */ 545 draw->suspend_flushing = TRUE; 546 pstip->driver_bind_fs_state(pipe, pstip->fs->driver_fs); 547 pstip->driver_bind_sampler_states(pipe, pstip->num_samplers, 548 pstip->state.samplers); 549 pstip->driver_set_sampler_textures(pipe, pstip->num_textures, 550 pstip->state.textures); 551 draw->suspend_flushing = FALSE; 552} 553 554 555static void 556pstip_reset_stipple_counter(struct draw_stage *stage) 557{ 558 stage->next->reset_stipple_counter( stage->next ); 559} 560 561 562static void 563pstip_destroy(struct draw_stage *stage) 564{ 565 struct pstip_stage *pstip = pstip_stage(stage); 566 uint i; 567 568 for (i = 0; i < PIPE_MAX_SAMPLERS; i++) { 569 pipe_texture_reference(&pstip->state.textures[i], NULL); 570 } 571 572 pstip->pipe->delete_sampler_state(pstip->pipe, pstip->sampler_cso); 573 574 pipe_texture_reference(&pstip->texture, NULL); 575 576 draw_free_temp_verts( stage ); 577 FREE( stage ); 578} 579 580 581static struct pstip_stage * 582draw_pstip_stage(struct draw_context *draw) 583{ 584 struct pstip_stage *pstip = CALLOC_STRUCT(pstip_stage); 585 586 draw_alloc_temp_verts( &pstip->stage, 8 ); 587 588 pstip->stage.draw = draw; 589 pstip->stage.name = "pstip"; 590 pstip->stage.next = NULL; 591 pstip->stage.point = draw_pipe_passthrough_point; 592 pstip->stage.line = draw_pipe_passthrough_line; 593 pstip->stage.tri = pstip_first_tri; 594 pstip->stage.flush = pstip_flush; 595 pstip->stage.reset_stipple_counter = pstip_reset_stipple_counter; 596 pstip->stage.destroy = pstip_destroy; 597 598 return pstip; 599} 600 601 602static struct pstip_stage * 603pstip_stage_from_pipe(struct pipe_context *pipe) 604{ 605 struct draw_context *draw = (struct draw_context *) pipe->draw; 606 return pstip_stage(draw->pipeline.pstipple); 607} 608 609 610/** 611 * This function overrides the driver's create_fs_state() function and 612 * will typically be called by the state tracker. 613 */ 614static void * 615pstip_create_fs_state(struct pipe_context *pipe, 616 const struct pipe_shader_state *fs) 617{ 618 struct pstip_stage *pstip = pstip_stage_from_pipe(pipe); 619 struct pstip_fragment_shader *aafs = CALLOC_STRUCT(pstip_fragment_shader); 620 621 if (aafs) { 622 aafs->state = *fs; 623 624 /* pass-through */ 625 aafs->driver_fs = pstip->driver_create_fs_state(pstip->pipe, fs); 626 } 627 628 return aafs; 629} 630 631 632static void 633pstip_bind_fs_state(struct pipe_context *pipe, void *fs) 634{ 635 struct pstip_stage *pstip = pstip_stage_from_pipe(pipe); 636 struct pstip_fragment_shader *aafs = (struct pstip_fragment_shader *) fs; 637 /* save current */ 638 pstip->fs = aafs; 639 /* pass-through */ 640 pstip->driver_bind_fs_state(pstip->pipe, 641 (aafs ? aafs->driver_fs : NULL)); 642} 643 644 645static void 646pstip_delete_fs_state(struct pipe_context *pipe, void *fs) 647{ 648 struct pstip_stage *pstip = pstip_stage_from_pipe(pipe); 649 struct pstip_fragment_shader *aafs = (struct pstip_fragment_shader *) fs; 650 /* pass-through */ 651 pstip->driver_delete_fs_state(pstip->pipe, aafs->driver_fs); 652 FREE(aafs); 653} 654 655 656static void 657pstip_bind_sampler_states(struct pipe_context *pipe, 658 unsigned num, void **sampler) 659{ 660 struct pstip_stage *pstip = pstip_stage_from_pipe(pipe); 661 uint i; 662 663 /* save current */ 664 memcpy(pstip->state.samplers, sampler, num * sizeof(void *)); 665 for (i = num; i < PIPE_MAX_SAMPLERS; i++) { 666 pstip->state.samplers[i] = NULL; 667 } 668 669 pstip->num_samplers = num; 670 /* pass-through */ 671 pstip->driver_bind_sampler_states(pstip->pipe, num, sampler); 672} 673 674 675static void 676pstip_set_sampler_textures(struct pipe_context *pipe, 677 unsigned num, struct pipe_texture **texture) 678{ 679 struct pstip_stage *pstip = pstip_stage_from_pipe(pipe); 680 uint i; 681 682 /* save current */ 683 for (i = 0; i < num; i++) { 684 pipe_texture_reference(&pstip->state.textures[i], texture[i]); 685 } 686 for (; i < PIPE_MAX_SAMPLERS; i++) { 687 pipe_texture_reference(&pstip->state.textures[i], NULL); 688 } 689 690 pstip->num_textures = num; 691 692 /* pass-through */ 693 pstip->driver_set_sampler_textures(pstip->pipe, num, texture); 694} 695 696 697static void 698pstip_set_polygon_stipple(struct pipe_context *pipe, 699 const struct pipe_poly_stipple *stipple) 700{ 701 struct pstip_stage *pstip = pstip_stage_from_pipe(pipe); 702 703 /* save current */ 704 pstip->state.stipple = stipple; 705 706 /* pass-through */ 707 pstip->driver_set_polygon_stipple(pstip->pipe, stipple); 708 709 pstip_update_texture(pstip); 710} 711 712 713/** 714 * Called by drivers that want to install this polygon stipple stage 715 * into the draw module's pipeline. This will not be used if the 716 * hardware has native support for polygon stipple. 717 */ 718boolean 719draw_install_pstipple_stage(struct draw_context *draw, 720 struct pipe_context *pipe) 721{ 722 struct pstip_stage *pstip; 723 724 pipe->draw = (void *) draw; 725 726 /* 727 * Create / install pgon stipple drawing / prim stage 728 */ 729 pstip = draw_pstip_stage( draw ); 730 if (pstip == NULL) 731 goto fail; 732 733 draw->pipeline.pstipple = &pstip->stage; 734 735 pstip->pipe = pipe; 736 737 /* create special texture, sampler state */ 738 if (!pstip_create_texture(pstip)) 739 goto fail; 740 741 if (!pstip_create_sampler(pstip)) 742 goto fail; 743 744 /* save original driver functions */ 745 pstip->driver_create_fs_state = pipe->create_fs_state; 746 pstip->driver_bind_fs_state = pipe->bind_fs_state; 747 pstip->driver_delete_fs_state = pipe->delete_fs_state; 748 749 pstip->driver_bind_sampler_states = pipe->bind_sampler_states; 750 pstip->driver_set_sampler_textures = pipe->set_sampler_textures; 751 pstip->driver_set_polygon_stipple = pipe->set_polygon_stipple; 752 753 /* override the driver's functions */ 754 pipe->create_fs_state = pstip_create_fs_state; 755 pipe->bind_fs_state = pstip_bind_fs_state; 756 pipe->delete_fs_state = pstip_delete_fs_state; 757 758 pipe->bind_sampler_states = pstip_bind_sampler_states; 759 pipe->set_sampler_textures = pstip_set_sampler_textures; 760 pipe->set_polygon_stipple = pstip_set_polygon_stipple; 761 762 return TRUE; 763 764 fail: 765 if (pstip) 766 pstip->stage.destroy( &pstip->stage ); 767 768 return FALSE; 769} 770