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