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