src/gallium/auxiliary/draw/draw_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_util.h"
  38 #include "pipe/p_inlines.h"
  39 #include "pipe/p_context.h"
  40 #include "pipe/p_defines.h"
  41 #include "pipe/p_shader_tokens.h"
  42
  43 #include "tgsi/util/tgsi_transform.h"
  44 #include "tgsi/util/tgsi_dump.h"
  45
  46 #include "draw_context.h"
  47 #include "draw_private.h"
  48
  49
  50
  51 /**
  52  * Subclass of pipe_shader_state to carry extra fragment shader info.
  53  */
  54 struct pstip_fragment_shader
  55 {
  56    struct pipe_shader_state state;
  57    void *driver_fs;
  58    void *pstip_fs;
  59 };
  60
  61
  62 /**
  63  * Subclass of draw_stage
  64  */
  65 struct pstip_stage
  66 {
  67    struct draw_stage stage;
  68
  69    void *sampler_cso;
  70    struct pipe_texture *texture;
  71    uint sampler_unit;
  72
  73    /*
  74     * Currently bound state
  75     */
  76    struct pstip_fragment_shader *fs;
  77    struct {
  78       void *sampler[PIPE_MAX_SAMPLERS];
  79       struct pipe_texture *texture[PIPE_MAX_SAMPLERS];
  80       const struct pipe_poly_stipple *stipple;
  81    } state;
  82
  83    /*
  84     * Driver interface/override functions
  85     */
  86    void * (*driver_create_fs_state)(struct pipe_context *,
  87                                     const struct pipe_shader_state *);
  88    void (*driver_bind_fs_state)(struct pipe_context *, void *);
  89    void (*driver_delete_fs_state)(struct pipe_context *, void *);
  90
  91    void (*driver_bind_sampler_state)(struct pipe_context *, unsigned, void *);
  92
  93    void (*driver_set_sampler_texture)(struct pipe_context *,
  94                                       unsigned sampler,
  95                                       struct pipe_texture *);
  96
  97    void (*driver_set_polygon_stipple)(struct pipe_context *,
  98                                       const struct pipe_poly_stipple *);
  99
 100    struct pipe_context *pipe;
 101 };
 102
 103
 104
 105 /**
 106  * Subclass of tgsi_transform_context, used for transforming the
 107  * user's fragment shader to add the special AA instructions.
 108  */
 109 struct pstip_transform_context {
 110    struct tgsi_transform_context base;
 111    uint tempsUsed;  /**< bitmask */
 112    int wincoordInput;
 113    int maxInput;
 114    int maxSampler;  /**< max sampler index found */
 115    int texTemp;  /**< temp registers */
 116    int numImmed;
 117    boolean firstInstruction;
 118 };
 119
 120
 121 /**
 122  * TGSI declaration transform callback.
 123  * Look for a free sampler, a free input attrib, and two free temp regs.
 124  */
 125 static void
 126 pstip_transform_decl(struct tgsi_transform_context *ctx,
 127                      struct tgsi_full_declaration *decl)
 128 {
 129    struct pstip_transform_context *pctx = (struct pstip_transform_context *) ctx;
 130
 131    if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
 132       if ((int) decl->u.DeclarationRange.Last > pctx->maxSampler)
 133          pctx->maxSampler = (int) decl->u.DeclarationRange.Last;
 134    }
 135    else if (decl->Declaration.File == TGSI_FILE_INPUT) {
 136       pctx->maxInput = MAX2(pctx->maxInput, (int) decl->u.DeclarationRange.Last);
 137       if (decl->Semantic.SemanticName == TGSI_SEMANTIC_POSITION)
 138          pctx->wincoordInput = (int) decl->u.DeclarationRange.First;
 139    }
 140    else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
 141       uint i;
 142       for (i = decl->u.DeclarationRange.First;
 143            i <= decl->u.DeclarationRange.Last; i++) {
 144          pctx->tempsUsed |= (1 << i);
 145       }
 146    }
 147
 148    ctx->emit_declaration(ctx, decl);
 149 }
 150
 151
 152 static void
 153 pstip_transform_immed(struct tgsi_transform_context *ctx,
 154                       struct tgsi_full_immediate *immed)
 155 {
 156    struct pstip_transform_context *pctx = (struct pstip_transform_context *) ctx;
 157    pctx->numImmed++;
 158 }
 159
 160
 161 /**
 162  * TGSI instruction transform callback.
 163  * Replace writes to result.color w/ a temp reg.
 164  * Upon END instruction, insert texture sampling code for antialiasing.
 165  */
 166 static void
 167 pstip_transform_inst(struct tgsi_transform_context *ctx,
 168                      struct tgsi_full_instruction *inst)
 169 {
 170    struct pstip_transform_context *pctx = (struct pstip_transform_context *) ctx;
 171
 172    if (pctx->firstInstruction) {
 173       /* emit our new declarations before the first instruction */
 174
 175       struct tgsi_full_declaration decl;
 176       struct tgsi_full_instruction newInst;
 177       uint i;
 178       int wincoordInput;
 179       const int sampler = pctx->maxSampler + 1;
 180
 181       if (pctx->wincoordInput < 0)
 182          wincoordInput = pctx->maxInput + 1;
 183       else
 184          wincoordInput = pctx->wincoordInput;
 185
 186       /* find one free temp reg */
 187       for (i = 0; i < 32; i++) {
 188          if ((pctx->tempsUsed & (1 << i)) == 0) {
 189             /* found a free temp */
 190             if (pctx->texTemp < 0)
 191                pctx->texTemp  = i;
 192             else
 193                break;
 194          }
 195       }
 196       assert(pctx->texTemp >= 0);
 197
 198       if (pctx->wincoordInput < 0) {
 199          /* declare new position input reg */
 200          decl = tgsi_default_full_declaration();
 201          decl.Declaration.File = TGSI_FILE_INPUT;
 202          decl.Declaration.Semantic = 1;
 203          decl.Semantic.SemanticName = TGSI_SEMANTIC_POSITION;
 204          decl.Semantic.SemanticIndex = 0;
 205          decl.Declaration.Interpolate = 1;
 206          decl.Interpolation.Interpolate = TGSI_INTERPOLATE_LINEAR; /* XXX? */
 207          decl.u.DeclarationRange.First =
 208             decl.u.DeclarationRange.Last = wincoordInput;
 209          ctx->emit_declaration(ctx, &decl);
 210       }
 211
 212       /* declare new sampler */
 213       decl = tgsi_default_full_declaration();
 214       decl.Declaration.File = TGSI_FILE_SAMPLER;
 215       decl.u.DeclarationRange.First =
 216       decl.u.DeclarationRange.Last = sampler;
 217       ctx->emit_declaration(ctx, &decl);
 218
 219       /* declare new temp regs */
 220       decl = tgsi_default_full_declaration();
 221       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 222       decl.u.DeclarationRange.First =
 223       decl.u.DeclarationRange.Last = pctx->texTemp;
 224       ctx->emit_declaration(ctx, &decl);
 225
 226       /* emit immediate = {1/32, 1/32, 1, 1}
 227        * The index/position of this immediate will be pctx->numImmed
 228        */
 229       {
 230          static const float value[4] = { 1.0/32, 1.0/32, 1.0, 1.0 };
 231          struct tgsi_full_immediate immed;
 232          uint size = 4;
 233          immed = tgsi_default_full_immediate();
 234          immed.Immediate.Size = 1 + size; /* one for the token itself */
 235          immed.u.ImmediateFloat32 = (struct tgsi_immediate_float32 *) value;
 236          ctx->emit_immediate(ctx, &immed);
 237       }
 238
 239       pctx->firstInstruction = FALSE;
 240
 241
 242       /*
 243        * Insert new MUL/TEX/KILP instructions at start of program
 244        * Take gl_FragCoord, divide by 32 (stipple size), sample the
 245        * texture and kill fragment if needed.
 246        *
 247        * We'd like to use non-normalized texcoords to index into a RECT
 248        * texture, but we can only use GL_REPEAT wrap mode with normalized
 249        * texcoords.  Darn.
 250        */
 251
 252       /* MUL texTemp, INPUT[wincoord], 1/32; */
 253       newInst = tgsi_default_full_instruction();
 254       newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
 255       newInst.Instruction.NumDstRegs = 1;
 256       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
 257       newInst.FullDstRegisters[0].DstRegister.Index = pctx->texTemp;
 258       newInst.Instruction.NumSrcRegs = 2;
 259       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_INPUT;
 260       newInst.FullSrcRegisters[0].SrcRegister.Index = wincoordInput;
 261       newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_IMMEDIATE;
 262       newInst.FullSrcRegisters[1].SrcRegister.Index = pctx->numImmed;
 263       ctx->emit_instruction(ctx, &newInst);
 264
 265       /* TEX texTemp, texTemp, sampler; */
 266       newInst = tgsi_default_full_instruction();
 267       newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
 268       newInst.Instruction.NumDstRegs = 1;
 269       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
 270       newInst.FullDstRegisters[0].DstRegister.Index = pctx->texTemp;
 271       newInst.Instruction.NumSrcRegs = 2;
 272       newInst.InstructionExtTexture.Texture = TGSI_TEXTURE_2D;
 273       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
 274       newInst.FullSrcRegisters[0].SrcRegister.Index = pctx->texTemp;
 275       newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_SAMPLER;
 276       newInst.FullSrcRegisters[1].SrcRegister.Index = sampler;
 277       ctx->emit_instruction(ctx, &newInst);
 278
 279       /* KILP texTemp;   # if texTemp < 0, KILL fragment */
 280       newInst = tgsi_default_full_instruction();
 281       newInst.Instruction.Opcode = TGSI_OPCODE_KILP;
 282       newInst.Instruction.NumDstRegs = 0;
 283       newInst.Instruction.NumSrcRegs = 1;
 284       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
 285       newInst.FullSrcRegisters[0].SrcRegister.Index = pctx->texTemp;
 286       newInst.FullSrcRegisters[0].SrcRegister.Negate = 1;
 287       ctx->emit_instruction(ctx, &newInst);
 288    }
 289
 290    /* emit this instruction */
 291    ctx->emit_instruction(ctx, inst);
 292 }
 293
 294
 295 /**
 296  * Generate the frag shader we'll use for doing polygon stipple.
 297  * This will be the user's shader prefixed with a TEX and KIL instruction.
 298  */
 299 static void
 300 generate_pstip_fs(struct pstip_stage *pstip)
 301 {
 302    const struct pipe_shader_state *orig_fs = &pstip->fs->state;
 303    /*struct draw_context *draw = pstip->stage.draw;*/
 304    struct pipe_shader_state pstip_fs;
 305    struct pstip_transform_context transform;
 306
 307 #define MAX 1000
 308
 309    pstip_fs = *orig_fs; /* copy to init */
 310    pstip_fs.tokens = MALLOC(sizeof(struct tgsi_token) * MAX);
 311
 312    memset(&transform, 0, sizeof(transform));
 313    transform.wincoordInput = -1;
 314    transform.maxInput = -1;
 315    transform.maxSampler = -1;
 316    transform.texTemp = -1;
 317    transform.firstInstruction = TRUE;
 318    transform.base.transform_instruction = pstip_transform_inst;
 319    transform.base.transform_declaration = pstip_transform_decl;
 320    transform.base.transform_immediate = pstip_transform_immed;
 321
 322    tgsi_transform_shader(orig_fs->tokens,
 323                          (struct tgsi_token *) pstip_fs.tokens,
 324                          MAX, &transform.base);
 325
 326 #if 1 /* DEBUG */
 327    tgsi_dump(orig_fs->tokens, 0);
 328    tgsi_dump(pstip_fs.tokens, 0);
 329 #endif
 330
 331    pstip->sampler_unit = transform.maxSampler + 1;
 332
 333    if (transform.wincoordInput < 0) {
 334       pstip_fs.input_semantic_name[pstip_fs.num_inputs] = TGSI_SEMANTIC_POSITION;
 335       pstip_fs.input_semantic_index[pstip_fs.num_inputs] = (ubyte)transform.maxInput;
 336       pstip_fs.num_inputs++;
 337    }
 338
 339    pstip->fs->pstip_fs = pstip->driver_create_fs_state(pstip->pipe, &pstip_fs);
 340 }
 341
 342
 343 /**
 344  * Load texture image with current stipple pattern.
 345  */
 346 static void
 347 pstip_update_texture(struct pstip_stage *pstip)
 348 {
 349    static const uint bit31 = 1 << 31;
 350    struct pipe_context *pipe = pstip->pipe;
 351    struct pipe_surface *surface;
 352    const uint *stipple = pstip->state.stipple->stipple;
 353    uint i, j;
 354    ubyte *data;
 355
 356    surface = pipe->get_tex_surface(pipe, pstip->texture, 0, 0, 0);
 357    data = pipe_surface_map(surface);
 358
 359    /*
 360     * Load alpha texture.
 361     * Note: 0 means keep the fragment, 255 means kill it.
 362     * We'll negate the texel value and use KILP which kills if value
 363     * is negative.
 364     */
 365    for (i = 0; i < 32; i++) {
 366       for (j = 0; j < 32; j++) {
 367          if (stipple[i] & (bit31 >> j)) {
 368             /* fragment "on" */
 369             data[i * surface->pitch + j] = 0;
 370          }
 371          else {
 372             /* fragment "off" */
 373             data[i * surface->pitch + j] = 255;
 374          }
 375       }
 376    }
 377
 378    /* unmap */
 379    pipe_surface_unmap(surface);
 380    pipe_surface_reference(&surface, NULL);
 381    pipe->texture_update(pipe, pstip->texture);
 382 }
 383
 384
 385 /**
 386  * Create the texture map we'll use for stippling.
 387  */
 388 static void
 389 pstip_create_texture(struct pstip_stage *pstip)
 390 {
 391    struct pipe_context *pipe = pstip->pipe;
 392    struct pipe_texture texTemp;
 393
 394    memset(&texTemp, 0, sizeof(texTemp));
 395    texTemp.target = PIPE_TEXTURE_2D;
 396    texTemp.format = PIPE_FORMAT_U_A8; /* XXX verify supported by driver! */
 397    texTemp.last_level = 0;
 398    texTemp.width[0] = 32;
 399    texTemp.height[0] = 32;
 400    texTemp.depth[0] = 1;
 401    texTemp.cpp = 1;
 402
 403    pstip->texture = pipe->texture_create(pipe, &texTemp);
 404
 405    //pstip_update_texture(pstip);
 406 }
 407
 408
 409 /**
 410  * Create the sampler CSO that'll be used for antialiasing.
 411  * By using a mipmapped texture, we don't have to generate a different
 412  * texture image for each line size.
 413  */
 414 static void
 415 pstip_create_sampler(struct pstip_stage *pstip)
 416 {
 417    struct pipe_sampler_state sampler;
 418    struct pipe_context *pipe = pstip->pipe;
 419
 420    memset(&sampler, 0, sizeof(sampler));
 421    sampler.wrap_s = PIPE_TEX_WRAP_REPEAT;
 422    sampler.wrap_t = PIPE_TEX_WRAP_REPEAT;
 423    sampler.wrap_r = PIPE_TEX_WRAP_REPEAT;
 424    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
 425    sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
 426    sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
 427    sampler.normalized_coords = 1;
 428    sampler.min_lod = 0.0f;
 429    sampler.max_lod = 0.0f;
 430
 431    pstip->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 432 }
 433
 434
 435 /**
 436  * When we're about to draw our first AA line in a batch, this function is
 437  * called to tell the driver to bind our modified fragment shader.
 438  */
 439 static void
 440 bind_pstip_fragment_shader(struct pstip_stage *pstip)
 441 {
 442    if (!pstip->fs->pstip_fs) {
 443       generate_pstip_fs(pstip);
 444    }
 445    pstip->driver_bind_fs_state(pstip->pipe, pstip->fs->pstip_fs);
 446 }
 447
 448
 449
 450 static INLINE struct pstip_stage *
 451 pstip_stage( struct draw_stage *stage )
 452 {
 453    return (struct pstip_stage *) stage;
 454 }
 455
 456
 457 static void
 458 passthrough_point(struct draw_stage *stage, struct prim_header *header)
 459 {
 460    stage->next->point(stage->next, header);
 461 }
 462
 463
 464 static void
 465 passthrough_line(struct draw_stage *stage, struct prim_header *header)
 466 {
 467    stage->next->line(stage->next, header);
 468 }
 469
 470
 471 static void
 472 passthrough_tri(struct draw_stage *stage, struct prim_header *header)
 473 {
 474    stage->next->tri(stage->next, header);
 475 }
 476
 477
 478
 479 static void
 480 pstip_first_tri(struct draw_stage *stage, struct prim_header *header)
 481 {
 482    struct pstip_stage *pstip = pstip_stage(stage);
 483    struct draw_context *draw = stage->draw;
 484    struct pipe_context *pipe = pstip->pipe;
 485
 486    assert(draw->rasterizer->poly_stipple_enable);
 487
 488    /*
 489     * Bind our fragprog, sampler and texture
 490     */
 491    bind_pstip_fragment_shader(pstip);
 492
 493    pstip->driver_bind_sampler_state(pipe, pstip->sampler_unit, pstip->sampler_cso);
 494    pstip->driver_set_sampler_texture(pipe, pstip->sampler_unit, pstip->texture);
 495
 496    /* now really draw first line */
 497    stage->tri = passthrough_tri;
 498    stage->tri(stage, header);
 499 }
 500
 501
 502 static void
 503 pstip_flush(struct draw_stage *stage, unsigned flags)
 504 {
 505    /*struct draw_context *draw = stage->draw;*/
 506    struct pstip_stage *pstip = pstip_stage(stage);
 507    struct pipe_context *pipe = pstip->pipe;
 508
 509    stage->tri = pstip_first_tri;
 510    stage->next->flush( stage->next, flags );
 511
 512    /* restore original frag shader */
 513    pstip->driver_bind_fs_state(pipe, pstip->fs->driver_fs);
 514
 515    /* XXX restore original texture, sampler state */
 516    pstip->driver_bind_sampler_state(pipe, pstip->sampler_unit,
 517                                  pstip->state.sampler[pstip->sampler_unit]);
 518    pstip->driver_set_sampler_texture(pipe, pstip->sampler_unit,
 519                                  pstip->state.texture[pstip->sampler_unit]);
 520 }
 521
 522
 523 static void
 524 pstip_reset_stipple_counter(struct draw_stage *stage)
 525 {
 526    stage->next->reset_stipple_counter( stage->next );
 527 }
 528
 529
 530 static void
 531 pstip_destroy(struct draw_stage *stage)
 532 {
 533    draw_free_temp_verts( stage );
 534    FREE( stage );
 535 }
 536
 537
 538 static struct pstip_stage *
 539 draw_pstip_stage(struct draw_context *draw)
 540 {
 541    struct pstip_stage *pstip = CALLOC_STRUCT(pstip_stage);
 542
 543    draw_alloc_temp_verts( &pstip->stage, 8 );
 544
 545    pstip->stage.draw = draw;
 546    pstip->stage.next = NULL;
 547    pstip->stage.point = passthrough_point;
 548    pstip->stage.line = passthrough_line;
 549    pstip->stage.tri = pstip_first_tri;
 550    pstip->stage.flush = pstip_flush;
 551    pstip->stage.reset_stipple_counter = pstip_reset_stipple_counter;
 552    pstip->stage.destroy = pstip_destroy;
 553
 554    return pstip;
 555 }
 556
 557
 558 /*
 559  * XXX temporary? solution to mapping a pipe_context to a pstip_stage.
 560  */
 561
 562 #define MAX_CONTEXTS 10
 563
 564 static struct pipe_context *Pipe[MAX_CONTEXTS];
 565 static struct pstip_stage *Stage[MAX_CONTEXTS];
 566 static uint NumContexts;
 567
 568 static void
 569 add_pstip_pipe_context(struct pipe_context *pipe, struct pstip_stage *pstip)
 570 {
 571    assert(NumContexts < MAX_CONTEXTS);
 572    Pipe[NumContexts] = pipe;
 573    Stage[NumContexts] = pstip;
 574    NumContexts++;
 575 }
 576
 577 static struct pstip_stage *
 578 pstip_stage_from_pipe(struct pipe_context *pipe)
 579 {
 580    uint i;
 581    for (i = 0; i < NumContexts; i++) {
 582       if (Pipe[i] == pipe)
 583          return Stage[i];
 584    }
 585    assert(0);
 586    return NULL;
 587 }
 588
 589
 590 /**
 591  * This function overrides the driver's create_fs_state() function and
 592  * will typically be called by the state tracker.
 593  */
 594 static void *
 595 pstip_create_fs_state(struct pipe_context *pipe,
 596                        const struct pipe_shader_state *fs)
 597 {
 598    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 599    struct pstip_fragment_shader *aafs = CALLOC_STRUCT(pstip_fragment_shader);
 600
 601    if (aafs) {
 602       aafs->state = *fs;
 603
 604       /* pass-through */
 605       aafs->driver_fs = pstip->driver_create_fs_state(pstip->pipe, fs);
 606    }
 607
 608    return aafs;
 609 }
 610
 611
 612 static void
 613 pstip_bind_fs_state(struct pipe_context *pipe, void *fs)
 614 {
 615    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 616    struct pstip_fragment_shader *aafs = (struct pstip_fragment_shader *) fs;
 617    /* save current */
 618    pstip->fs = aafs;
 619    /* pass-through */
 620    pstip->driver_bind_fs_state(pstip->pipe, aafs->driver_fs);
 621 }
 622
 623
 624 static void
 625 pstip_delete_fs_state(struct pipe_context *pipe, void *fs)
 626 {
 627    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 628    struct pstip_fragment_shader *aafs = (struct pstip_fragment_shader *) fs;
 629    /* pass-through */
 630    pstip->driver_delete_fs_state(pstip->pipe, aafs->driver_fs);
 631    FREE(aafs);
 632 }
 633
 634
 635 static void
 636 pstip_bind_sampler_state(struct pipe_context *pipe,
 637                          unsigned unit, void *sampler)
 638 {
 639    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 640    /* save current */
 641    pstip->state.sampler[unit] = sampler;
 642    /* pass-through */
 643    pstip->driver_bind_sampler_state(pstip->pipe, unit, sampler);
 644 }
 645
 646
 647 static void
 648 pstip_set_sampler_texture(struct pipe_context *pipe,
 649                           unsigned sampler, struct pipe_texture *texture)
 650 {
 651    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 652    /* save current */
 653    pstip->state.texture[sampler] = texture;
 654    /* pass-through */
 655    pstip->driver_set_sampler_texture(pstip->pipe, sampler, texture);
 656 }
 657
 658
 659 static void
 660 pstip_set_polygon_stipple(struct pipe_context *pipe,
 661                           const struct pipe_poly_stipple *stipple)
 662 {
 663    struct pstip_stage *pstip = pstip_stage_from_pipe(pipe);
 664    /* save current */
 665    pstip->state.stipple = stipple;
 666    /* pass-through */
 667    pstip->driver_set_polygon_stipple(pstip->pipe, stipple);
 668
 669    pstip_update_texture(pstip);
 670 }
 671
 672
 673
 674 /**
 675  * Called by drivers that want to install this AA line prim stage
 676  * into the draw module's pipeline.  This will not be used if the
 677  * hardware has native support for AA lines.
 678  */
 679 void
 680 draw_install_pstipple_stage(struct draw_context *draw,
 681                             struct pipe_context *pipe)
 682 {
 683    struct pstip_stage *pstip;
 684
 685    /*
 686     * Create / install AA line drawing / prim stage
 687     */
 688    pstip = draw_pstip_stage( draw );
 689    assert(pstip);
 690    draw->pipeline.pstipple = &pstip->stage;
 691
 692    pstip->pipe = pipe;
 693
 694    /* create special texture, sampler state */
 695    pstip_create_texture(pstip);
 696    pstip_create_sampler(pstip);
 697
 698    /* save original driver functions */
 699    pstip->driver_create_fs_state = pipe->create_fs_state;
 700    pstip->driver_bind_fs_state = pipe->bind_fs_state;
 701    pstip->driver_delete_fs_state = pipe->delete_fs_state;
 702
 703    pstip->driver_bind_sampler_state = pipe->bind_sampler_state;
 704    pstip->driver_set_sampler_texture = pipe->set_sampler_texture;
 705    pstip->driver_set_polygon_stipple = pipe->set_polygon_stipple;
 706
 707    /* override the driver's functions */
 708    pipe->create_fs_state = pstip_create_fs_state;
 709    pipe->bind_fs_state = pstip_bind_fs_state;
 710    pipe->delete_fs_state = pstip_delete_fs_state;
 711
 712    pipe->bind_sampler_state = pstip_bind_sampler_state;
 713    pipe->set_sampler_texture = pstip_set_sampler_texture;
 714    pipe->set_polygon_stipple = pstip_set_polygon_stipple;
 715
 716    add_pstip_pipe_context(pipe, pstip);
 717 }