workbench/libs/mesa/src/gallium/auxiliary/draw/draw_pipe_pstipple.c

   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 using the
  31  * fragment window coordinate register and does a fragment kill for the
  32  * stipple-failing fragments.
  33  *
  34  * Authors:  Brian Paul
  35  */
  36
  37
  38 #include "pipe/p_context.h"
  39 #include "pipe/p_defines.h"
  40 #include "pipe/p_shader_tokens.h"
  41 #include "util/u_inlines.h"
  42
  43 #include "util/u_format.h"
  44 #include "util/u_math.h"
  45 #include "util/u_memory.h"
  46 #include "util/u_sampler.h"
  47
  48 #include "tgsi/tgsi_transform.h"
  49 #include "tgsi/tgsi_dump.h"
  50
  51 #include "draw_context.h"
  52 #include "draw_pipe.h"
  53
  54
  55 /** Approx number of new tokens for instructions in pstip_transform_inst() */
  56 #define NUM_NEW_TOKENS 50
  57
  58
  59 /**
  60  * Subclass of pipe_shader_state to carry extra fragment shader info.
  61  */
  62 struct pstip_fragment_shader
  63 {
  64    struct pipe_shader_state state;
  65    void *driver_fs;
  66    void *pstip_fs;
  67    uint sampler_unit;
  68 };
  69
  70
  71 /**
  72  * Subclass of draw_stage
  73  */
  74 struct pstip_stage
  75 {
  76    struct draw_stage stage;
  77
  78    void *sampler_cso;
  79    struct pipe_resource *texture;
  80    struct pipe_sampler_view *sampler_view;
  81    uint num_samplers;
  82    uint num_sampler_views;
  83
  84    /*
  85     * Currently bound state
  86     */
  87    struct pstip_fragment_shader *fs;
  88    struct {
  89       void *samplers[PIPE_MAX_SAMPLERS];
  90       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
  91       const struct pipe_poly_stipple *stipple;
  92    } state;
  93
  94    /*
  95     * Driver interface/override functions
  96     */
  97    void * (*driver_create_fs_state)(struct pipe_context *,
  98                                     const struct pipe_shader_state *);
  99    void (*driver_bind_fs_state)(struct pipe_context *, void *);
 100    void (*driver_delete_fs_state)(struct pipe_context *, void *);
 101
 102    void (*driver_bind_sampler_states)(struct pipe_context *, unsigned, void **);
 103
 104    void (*driver_set_sampler_views)(struct pipe_context *,
 105                                     unsigned,
 106                                     struct pipe_sampler_view **);
 107
 108    void (*driver_set_polygon_stipple)(struct pipe_context *,
 109                                       const struct pipe_poly_stipple *);
 110
 111    struct pipe_context *pipe;
 112 };
 113
 114
 115
 116 /**
 117  * Subclass of tgsi_transform_context, used for transforming the
 118  * user's fragment shader to add the extra texture sample and fragment kill
 119  * instructions.
 120  */
 121 struct pstip_transform_context {
 122    struct tgsi_transform_context base;
 123    uint tempsUsed;  /**< bitmask */
 124    int wincoordInput;
 125    int maxInput;
 126    uint samplersUsed;  /**< bitfield of samplers used */
 127    int freeSampler;  /** an available sampler for the pstipple */
 128    int texTemp;  /**< temp registers */
 129    int numImmed;
 130    boolean firstInstruction;
 131 };
 132
 133
 134 /**
 135  * TGSI declaration transform callback.
 136  * Look for a free sampler, a free input attrib, and two free temp regs.
 137  */
 138 static void
 139 pstip_transform_decl(struct tgsi_transform_context *ctx,
 140                      struct tgsi_full_declaration *decl)
 141 {
 142    struct pstip_transform_context *pctx = (struct pstip_transform_context *) ctx;
 143
 144    if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
 145       uint i;
 146       for (i = decl->Range.First;
 147            i <= decl->Range.Last; i++) {
 148          pctx->samplersUsed |= 1 << i;
 149       }
 150    }
 151    else if (decl->Declaration.File == TGSI_FILE_INPUT) {
 152       pctx->maxInput = MAX2(pctx->maxInput, (int) decl->Range.Last);
 153       if (decl->Semantic.Name == TGSI_SEMANTIC_POSITION)
 154          pctx->wincoordInput = (int) decl->Range.First;
 155    }
 156    else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
 157       uint i;
 158       for (i = decl->Range.First;
 159            i <= decl->Range.Last; i++) {
 160          pctx->tempsUsed |= (1 << i);
 161       }
 162    }
 163
 164    ctx->emit_declaration(ctx, decl);
 165 }
 166
 167
 168 static void
 169 pstip_transform_immed(struct tgsi_transform_context *ctx,
 170                       struct tgsi_full_immediate *immed)
 171 {
 172    struct pstip_transform_context *pctx = (struct pstip_transform_context *) ctx;
 173    pctx->numImmed++;
 174 }
 175
 176
 177 /**
 178  * Find the lowest zero bit in the given word, or -1 if bitfield is all ones.
 179  */
 180 static int
 181 free_bit(uint bitfield)
 182 {
 183    return ffs(~bitfield) - 1;
 184 }
 185
 186
 187 /**
 188  * TGSI instruction transform callback.
 189  * Replace writes to result.color w/ a temp reg.
 190  * Upon END instruction, insert texture sampling code for antialiasing.
 191  */
 192 static void
 193 pstip_transform_inst(struct tgsi_transform_context *ctx,
 194                      struct tgsi_full_instruction *inst)
 195 {
 196    struct pstip_transform_context *pctx = (struct pstip_transform_context *) ctx;
 197
 198    if (pctx->firstInstruction) {
 199       /* emit our new declarations before the first instruction */
 200
 201       struct tgsi_full_declaration decl;
 202       struct tgsi_full_instruction newInst;
 203       uint i;
 204       int wincoordInput;
 205
 206       /* find free sampler */
 207       pctx->freeSampler = free_bit(pctx->samplersUsed);
 208       if (pctx->freeSampler >= PIPE_MAX_SAMPLERS)
 209          pctx->freeSampler = PIPE_MAX_SAMPLERS - 1;
 210
 211       if (pctx->wincoordInput < 0)
 212          wincoordInput = pctx->maxInput + 1;
 213       else
 214          wincoordInput = pctx->wincoordInput;
 215
 216       /* find one free temp reg */
 217       for (i = 0; i < 32; i++) {
 218          if ((pctx->tempsUsed & (1 << i)) == 0) {
 219             /* found a free temp */
 220             if (pctx->texTemp < 0)
 221                pctx->texTemp  = i;
 222             else
 223                break;
 224          }
 225       }
 226       assert(pctx->texTemp >= 0);
 227
 228       if (pctx->wincoordInput < 0) {
 229          /* declare new position input reg */
 230          decl = tgsi_default_full_declaration();
 231          decl.Declaration.File = TGSI_FILE_INPUT;
 232          decl.Declaration.Interpolate = TGSI_INTERPOLATE_LINEAR; /* XXX? */
 233          decl.Declaration.Semantic = 1;
 234          decl.Semantic.Name = TGSI_SEMANTIC_POSITION;
 235          decl.Semantic.Index = 0;
 236          decl.Range.First =
 237             decl.Range.Last = wincoordInput;
 238          ctx->emit_declaration(ctx, &decl);
 239       }
 240
 241       /* declare new sampler */
 242       decl = tgsi_default_full_declaration();
 243       decl.Declaration.File = TGSI_FILE_SAMPLER;
 244       decl.Range.First =
 245       decl.Range.Last = pctx->freeSampler;
 246       ctx->emit_declaration(ctx, &decl);
 247
 248       /* declare new temp regs */
 249       decl = tgsi_default_full_declaration();
 250       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 251       decl.Range.First =
 252       decl.Range.Last = pctx->texTemp;
 253       ctx->emit_declaration(ctx, &decl);
 254
 255       /* emit immediate = {1/32, 1/32, 1, 1}
 256        * The index/position of this immediate will be pctx->numImmed
 257        */
 258       {
 259          static const float value[4] = { 1.0/32, 1.0/32, 1.0, 1.0 };
 260          struct tgsi_full_immediate immed;
 261          uint size = 4;
 262          immed = tgsi_default_full_immediate();
 263          immed.Immediate.NrTokens = 1 + size; /* one for the token itself */
 264          immed.u[0].Float = value[0];
 265          immed.u[1].Float = value[1];
 266          immed.u[2].Float = value[2];
 267          immed.u[3].Float = value[3];
 268          ctx->emit_immediate(ctx, &immed);
 269       }
 270
 271       pctx->firstInstruction = FALSE;
 272
 273
 274       /*
 275        * Insert new MUL/TEX/KILP instructions at start of program
 276        * Take gl_FragCoord, divide by 32 (stipple size), sample the
 277        * texture and kill fragment if needed.
 278        *
 279        * We'd like to use non-normalized texcoords to index into a RECT
 280        * texture, but we can only use GL_REPEAT wrap mode with normalized
 281        * texcoords.  Darn.
 282        */
 283
 284       /* MUL texTemp, INPUT[wincoord], 1/32; */
 285       newInst = tgsi_default_full_instruction();
 286       newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
 287       newInst.Instruction.NumDstRegs = 1;
 288       newInst.Dst[0].Register.File = TGSI_FILE_TEMPORARY;
 289       newInst.Dst[0].Register.Index = pctx->texTemp;
 290       newInst.Instruction.NumSrcRegs = 2;
 291       newInst.Src[0].Register.File = TGSI_FILE_INPUT;
 292       newInst.Src[0].Register.Index = wincoordInput;
 293       newInst.Src[1].Register.File = TGSI_FILE_IMMEDIATE;
 294       newInst.Src[1].Register.Index = pctx->numImmed;
 295       ctx->emit_instruction(ctx, &newInst);
 296
 297       /* TEX texTemp, texTemp, sampler; */
 298       newInst = tgsi_default_full_instruction();
 299       newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
 300       newInst.Instruction.NumDstRegs = 1;
 301       newInst.Dst[0].Register.File = TGSI_FILE_TEMPORARY;
 302       newInst.Dst[0].Register.Index = pctx->texTemp;
 303       newInst.Instruction.NumSrcRegs = 2;
 304       newInst.Instruction.Texture = TRUE;
 305       newInst.Texture.Texture = TGSI_TEXTURE_2D;
 306       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 307       newInst.Src[0].Register.Index = pctx->texTemp;
 308       newInst.Src[1].Register.File = TGSI_FILE_SAMPLER;
 309       newInst.Src[1].Register.Index = pctx->freeSampler;
 310       ctx->emit_instruction(ctx, &newInst);
 311
 312       /* KIL -texTemp;   # if -texTemp < 0, KILL fragment */
 313       newInst = tgsi_default_full_instruction();
 314       newInst.Instruction.Opcode = TGSI_OPCODE_KIL;
 315       newInst.Instruction.NumDstRegs = 0;
 316       newInst.Instruction.NumSrcRegs = 1;
 317       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 318       newInst.Src[0].Register.Index = pctx->texTemp;
 319       newInst.Src[0].Register.Negate = 1;
 320       ctx->emit_instruction(ctx, &newInst);
 321    }
 322
 323    /* emit this instruction */
 324    ctx->emit_instruction(ctx, inst);
 325 }
 326
 327
 328 /**
 329  * Generate the frag shader we'll use for doing polygon stipple.
 330  * This will be the user's shader prefixed with a TEX and KIL instruction.
 331  */
 332 static boolean
 333 generate_pstip_fs(struct pstip_stage *pstip)
 334 {
 335    const struct pipe_shader_state *orig_fs = &pstip->fs->state;
 336    /*struct draw_context *draw = pstip->stage.draw;*/
 337    struct pipe_shader_state pstip_fs;
 338    struct pstip_transform_context transform;
 339    const uint newLen = tgsi_num_tokens(orig_fs->tokens) + NUM_NEW_TOKENS;
 340
 341    pstip_fs = *orig_fs; /* copy to init */
 342    pstip_fs.tokens = tgsi_alloc_tokens(newLen);
 343    if (pstip_fs.tokens == NULL)
 344       return FALSE;
 345
 346    memset(&transform, 0, sizeof(transform));
 347    transform.wincoordInput = -1;
 348    transform.maxInput = -1;
 349    transform.texTemp = -1;
 350    transform.firstInstruction = TRUE;
 351    transform.base.transform_instruction = pstip_transform_inst;
 352    transform.base.transform_declaration = pstip_transform_decl;
 353    transform.base.transform_immediate = pstip_transform_immed;
 354
 355    tgsi_transform_shader(orig_fs->tokens,
 356                          (struct tgsi_token *) pstip_fs.tokens,
 357                          newLen, &transform.base);
 358
 359 #if 0 /* DEBUG */
 360    tgsi_dump(orig_fs->tokens, 0);
 361    tgsi_dump(pstip_fs.tokens, 0);
 362 #endif
 363
 364    pstip->fs->sampler_unit = transform.freeSampler;
 365    assert(pstip->fs->sampler_unit < PIPE_MAX_SAMPLERS);
 366
 367    pstip->fs->pstip_fs = pstip->driver_create_fs_state(pstip->pipe, &pstip_fs);
 368
 369    FREE((void *)pstip_fs.tokens);
 370
 371    if (!pstip->fs->pstip_fs)
 372       return FALSE;
 373
 374    return TRUE;
 375 }
 376
 377
 378 /**
 379  * Load texture image with current stipple pattern.
 380  */
 381 static void
 382 pstip_update_texture(struct pstip_stage *pstip)
 383 {
 384    static const uint bit31 = 1 << 31;
 385    struct pipe_context *pipe = pstip->pipe;
 386    struct pipe_transfer *transfer;
 387    const uint *stipple = pstip->state.stipple->stipple;
 388    uint i, j;
 389    ubyte *data;
 390
 391    transfer = pipe_get_transfer(pipe, pstip->texture, 0, 0,
 392                                 PIPE_TRANSFER_WRITE, 0, 0, 32, 32);
 393    data = pipe->transfer_map(pipe, transfer);
 394
 395    /*
 396     * Load alpha texture.
 397     * Note: 0 means keep the fragment, 255 means kill it.
 398     * We'll negate the texel value and use KILP which kills if value
 399     * is negative.
 400     */
 401    for (i = 0; i < 32; i++) {
 402       for (j = 0; j < 32; j++) {
 403          if (stipple[i] & (bit31 >> j)) {
 404             /* fragment "on" */
 405             data[i * transfer->stride + j] = 0;
 406          }
 407          else {
 408             /* fragment "off" */
 409             data[i * transfer->stride + j] = 255;
 410          }
 411       }
 412    }
 413
 414    /* unmap */
 415    pipe->transfer_unmap(pipe, transfer);
 416    pipe->transfer_destroy(pipe, transfer);
 417 }
 418
 419
 420 /**
 421  * Create the texture map we'll use for stippling.
 422  */
 423 static boolean
 424 pstip_create_texture(struct pstip_stage *pstip)
 425 {
 426    struct pipe_context *pipe = pstip->pipe;
 427    struct pipe_screen *screen = pipe->screen;
 428    struct pipe_resource texTemp;
 429    struct pipe_sampler_view viewTempl;
 430
 431    memset(&texTemp, 0, sizeof(texTemp));
 432    texTemp.target = PIPE_TEXTURE_2D;
 433    texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
 434    texTemp.last_level = 0;
 435    texTemp.width0 = 32;
 436    texTemp.height0 = 32;
 437    texTemp.depth0 = 1;
 438    texTemp.array_size = 1;
 439    texTemp.bind = PIPE_BIND_SAMPLER_VIEW;
 440
 441    pstip->texture = screen->resource_create(screen, &texTemp);
 442    if (pstip->texture == NULL)
 443       return FALSE;
 444
 445    u_sampler_view_default_template(&viewTempl,
 446                                    pstip->texture,
 447                                    pstip->texture->format);
 448    pstip->sampler_view = pipe->create_sampler_view(pipe,
 449                                                    pstip->texture,
 450                                                    &viewTempl);
 451    if (!pstip->sampler_view) {
 452       return FALSE;
 453    }
 454
 455    return TRUE;
 456 }
 457
 458
 459 /**
 460  * Create the sampler CSO that'll be used for stippling.
 461  */
 462 static boolean
 463 pstip_create_sampler(struct pstip_stage *pstip)
 464 {
 465    struct pipe_sampler_state sampler;
 466    struct pipe_context *pipe = pstip->pipe;
 467
 468    memset(&sampler, 0, sizeof(sampler));
 469    sampler.wrap_s = PIPE_TEX_WRAP_REPEAT;
 470    sampler.wrap_t = PIPE_TEX_WRAP_REPEAT;
 471    sampler.wrap_r = PIPE_TEX_WRAP_REPEAT;
 472    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 473    sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
 474    sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 475    sampler.normalized_coords = 1;
 476    sampler.min_lod = 0.0f;
 477    sampler.max_lod = 0.0f;
 478
 479    pstip->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 480    if (pstip->sampler_cso == NULL)
 481       return FALSE;
 482
 483    return TRUE;
 484 }
 485
 486
 487 /**
 488  * When we're about to draw our first stipple polygon in a batch, this function
 489  * is called to tell the driver to bind our modified fragment shader.
 490  */
 491 static boolean
 492 bind_pstip_fragment_shader(struct pstip_stage *pstip)
 493 {
 494    struct draw_context *draw = pstip->stage.draw;
 495    if (!pstip->fs->pstip_fs &&
 496        !generate_pstip_fs(pstip))
 497       return FALSE;
 498
 499    draw->suspend_flushing = TRUE;
 500    pstip->driver_bind_fs_state(pstip->pipe, pstip->fs->pstip_fs);
 501    draw->suspend_flushing = FALSE;
 502    return TRUE;
 503 }
 504
 505
 506 static INLINE struct pstip_stage *
 507 pstip_stage( struct draw_stage *stage )
 508 {
 509    return (struct pstip_stage *) stage;
 510 }
 511
 512
 513 static void
 514 pstip_first_tri(struct draw_stage *stage, struct prim_header *header)
 515 {
 516    struct pstip_stage *pstip = pstip_stage(stage);
 517    struct pipe_context *pipe = pstip->pipe;
 518    struct draw_context *draw = stage->draw;
 519    uint num_samplers;
 520
 521    assert(stage->draw->rasterizer->poly_stipple_enable);
 522
 523    /* bind our fragprog */
 524    if (!bind_pstip_fragment_shader(pstip)) {
 525       stage->tri = draw_pipe_passthrough_tri;
 526       stage->tri(stage, header);
 527       return;
 528    }
 529
 530
 531    /* how many samplers? */
 532    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 533    num_samplers = MAX2(pstip->num_sampler_views, pstip->num_samplers);
 534    num_samplers = MAX2(num_samplers, pstip->fs->sampler_unit + 1);
 535
 536    /* plug in our sampler, texture */
 537    pstip->state.samplers[pstip->fs->sampler_unit] = pstip->sampler_cso;
 538    pipe_sampler_view_reference(&pstip->state.sampler_views[pstip->fs->sampler_unit],
 539                                pstip->sampler_view);
 540
 541    assert(num_samplers <= PIPE_MAX_SAMPLERS);
 542
 543    draw->suspend_flushing = TRUE;
 544    pstip->driver_bind_sampler_states(pipe, num_samplers, pstip->state.samplers);
 545    pstip->driver_set_sampler_views(pipe, num_samplers, pstip->state.sampler_views);
 546    draw->suspend_flushing = FALSE;
 547
 548    /* now really draw first triangle */
 549    stage->tri = draw_pipe_passthrough_tri;
 550    stage->tri(stage, header);
 551 }
 552
 553
 554 static void
 555 pstip_flush(struct draw_stage *stage, unsigned flags)
 556 {
 557    struct draw_context *draw = stage->draw;
 558    struct pstip_stage *pstip = pstip_stage(stage);
 559    struct pipe_context *pipe = pstip->pipe;
 560
 561    stage->tri = pstip_first_tri;
 562    stage->next->flush( stage->next, flags );
 563
 564    /* restore original frag shader, texture, sampler state */
 565    draw->suspend_flushing = TRUE;
 566    pstip->driver_bind_fs_state(pipe, pstip->fs->driver_fs);
 567    pstip->driver_bind_sampler_states(pipe, pstip->num_samplers,
 568                                      pstip->state.samplers);
 569    pstip->driver_set_sampler_views(pipe,
 570                                    pstip->num_sampler_views,
 571                                    pstip->state.sampler_views);
 572    draw->suspend_flushing = FALSE;
 573 }
 574
 575
 576 static void
 577 pstip_reset_stipple_counter(struct draw_stage *stage)
 578 {
 579    stage->next->reset_stipple_counter( stage->next );
 580 }
 581
 582
 583 static void
 584 pstip_destroy(struct draw_stage *stage)
 585 {
 586    struct pstip_stage *pstip = pstip_stage(stage);
 587    uint i;
 588
 589    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 590       pipe_sampler_view_reference(&pstip->state.sampler_views[i], NULL);
 591    }
 592
 593    pstip->pipe->delete_sampler_state(pstip->pipe, pstip->sampler_cso);
 594
 595    pipe_resource_reference(&pstip->texture, NULL);
 596
 597    if (pstip->sampler_view) {
 598       pipe_sampler_view_reference(&pstip->sampler_view, NULL);
 599    }
 600
 601    draw_free_temp_verts( stage );
 602    FREE( stage );
 603 }
 604
 605
 606 /** Create a new polygon stipple drawing stage object */
 607 static struct pstip_stage *
 608 draw_pstip_stage(struct draw_context *draw, struct pipe_context *pipe)
 609 {
 610    struct pstip_stage *pstip = CALLOC_STRUCT(pstip_stage);
 611    if (pstip == NULL)
 612       goto fail;
 613
 614    pstip->pipe = pipe;
 615
 616    pstip->stage.draw = draw;
 617    pstip->stage.name = "pstip";
 618    pstip->stage.next = NULL;
 619    pstip->stage.point = draw_pipe_passthrough_point;
 620    pstip->stage.line = draw_pipe_passthrough_line;
 621    pstip->stage.tri = pstip_first_tri;
 622    pstip->stage.flush = pstip_flush;
 623    pstip->stage.reset_stipple_counter = pstip_reset_stipple_counter;
 624    pstip->stage.destroy = pstip_destroy;
 625
 626    if (!draw_alloc_temp_verts( &pstip->stage, 8 ))
 627       goto fail;
 628
 629    return pstip;
 630
 631 fail:
 632    if (pstip)
 633       pstip->stage.destroy( &pstip->stage );
 634
 635    return NULL;
 636 }
 637
 638
 639 static struct pstip_stage *
 640 pstip_stage_from_pipe(struct pipe_context *pipe)
 641 {
 642    struct draw_context *draw = (struct draw_context *) pipe->draw;
 643    return pstip_stage(draw->pipeline.pstipple);
 644 }
 645
 646
 647 /**
 648  * This function overrides the driver's create_fs_state() function and
 649  * will typically be called by the state tracker.
 650  */
 651 static void *
 652 pstip_create_fs_state(struct pipe_context *pipe,
 653                        const struct pipe_shader_state *fs)
 654 {
 655    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 656    struct pstip_fragment_shader *pstipfs = CALLOC_STRUCT(pstip_fragment_shader);
 657
 658    if (pstipfs) {
 659       pstipfs->state = *fs;
 660
 661       /* pass-through */
 662       pstipfs->driver_fs = pstip->driver_create_fs_state(pstip->pipe, fs);
 663    }
 664
 665    return pstipfs;
 666 }
 667
 668
 669 static void
 670 pstip_bind_fs_state(struct pipe_context *pipe, void *fs)
 671 {
 672    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 673    struct pstip_fragment_shader *pstipfs = (struct pstip_fragment_shader *) fs;
 674    /* save current */
 675    pstip->fs = pstipfs;
 676    /* pass-through */
 677    pstip->driver_bind_fs_state(pstip->pipe,
 678                                (pstipfs ? pstipfs->driver_fs : NULL));
 679 }
 680
 681
 682 static void
 683 pstip_delete_fs_state(struct pipe_context *pipe, void *fs)
 684 {
 685    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 686    struct pstip_fragment_shader *pstipfs = (struct pstip_fragment_shader *) fs;
 687    /* pass-through */
 688    pstip->driver_delete_fs_state(pstip->pipe, pstipfs->driver_fs);
 689
 690    if (pstipfs->pstip_fs)
 691       pstip->driver_delete_fs_state(pstip->pipe, pstipfs->pstip_fs);
 692
 693    FREE(pstipfs);
 694 }
 695
 696
 697 static void
 698 pstip_bind_sampler_states(struct pipe_context *pipe,
 699                           unsigned num, void **sampler)
 700 {
 701    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 702    uint i;
 703
 704    /* save current */
 705    memcpy(pstip->state.samplers, sampler, num * sizeof(void *));
 706    for (i = num; i < PIPE_MAX_SAMPLERS; i++) {
 707       pstip->state.samplers[i] = NULL;
 708    }
 709
 710    pstip->num_samplers = num;
 711    /* pass-through */
 712    pstip->driver_bind_sampler_states(pstip->pipe, num, sampler);
 713 }
 714
 715
 716 static void
 717 pstip_set_sampler_views(struct pipe_context *pipe,
 718                         unsigned num,
 719                         struct pipe_sampler_view **views)
 720 {
 721    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 722    uint i;
 723
 724    /* save current */
 725    for (i = 0; i < num; i++) {
 726       pipe_sampler_view_reference(&pstip->state.sampler_views[i], views[i]);
 727    }
 728    for (; i < PIPE_MAX_SAMPLERS; i++) {
 729       pipe_sampler_view_reference(&pstip->state.sampler_views[i], NULL);
 730    }
 731
 732    pstip->num_sampler_views = num;
 733
 734    /* pass-through */
 735    pstip->driver_set_sampler_views(pstip->pipe, num, views);
 736 }
 737
 738
 739 static void
 740 pstip_set_polygon_stipple(struct pipe_context *pipe,
 741                           const struct pipe_poly_stipple *stipple)
 742 {
 743    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 744
 745    /* save current */
 746    pstip->state.stipple = stipple;
 747
 748    /* pass-through */
 749    pstip->driver_set_polygon_stipple(pstip->pipe, stipple);
 750
 751    pstip_update_texture(pstip);
 752 }
 753
 754
 755 /**
 756  * Called by drivers that want to install this polygon stipple stage
 757  * into the draw module's pipeline.  This will not be used if the
 758  * hardware has native support for polygon stipple.
 759  */
 760 boolean
 761 draw_install_pstipple_stage(struct draw_context *draw,
 762                             struct pipe_context *pipe)
 763 {
 764    struct pstip_stage *pstip;
 765
 766    pipe->draw = (void *) draw;
 767
 768    /*
 769     * Create / install pgon stipple drawing / prim stage
 770     */
 771    pstip = draw_pstip_stage( draw, pipe );
 772    if (pstip == NULL)
 773       goto fail;
 774
 775    draw->pipeline.pstipple = &pstip->stage;
 776
 777    /* create special texture, sampler state */
 778    if (!pstip_create_texture(pstip))
 779       goto fail;
 780
 781    if (!pstip_create_sampler(pstip))
 782       goto fail;
 783
 784    /* save original driver functions */
 785    pstip->driver_create_fs_state = pipe->create_fs_state;
 786    pstip->driver_bind_fs_state = pipe->bind_fs_state;
 787    pstip->driver_delete_fs_state = pipe->delete_fs_state;
 788
 789    pstip->driver_bind_sampler_states = pipe->bind_fragment_sampler_states;
 790    pstip->driver_set_sampler_views = pipe->set_fragment_sampler_views;
 791    pstip->driver_set_polygon_stipple = pipe->set_polygon_stipple;
 792
 793    /* override the driver's functions */
 794    pipe->create_fs_state = pstip_create_fs_state;
 795    pipe->bind_fs_state = pstip_bind_fs_state;
 796    pipe->delete_fs_state = pstip_delete_fs_state;
 797
 798    pipe->bind_fragment_sampler_states = pstip_bind_sampler_states;
 799    pipe->set_fragment_sampler_views = pstip_set_sampler_views;
 800    pipe->set_polygon_stipple = pstip_set_polygon_stipple;
 801
 802    return TRUE;
 803
 804  fail:
 805    if (pstip)
 806       pstip->stage.destroy( &pstip->stage );
 807
 808    return FALSE;
 809 }