src/gallium/auxiliary/draw/draw_pipe_aaline.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 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  * AA line stage:  AA lines are converted to texture mapped triangles.
  30  *
  31  * Authors:  Brian Paul
  32  */
  33
  34
  35 #include "pipe/p_context.h"
  36 #include "pipe/p_defines.h"
  37 #include "pipe/p_shader_tokens.h"
  38 #include "util/u_inlines.h"
  39
  40 #include "util/u_format.h"
  41 #include "util/u_math.h"
  42 #include "util/u_memory.h"
  43 #include "util/u_sampler.h"
  44
  45 #include "tgsi/tgsi_transform.h"
  46 #include "tgsi/tgsi_dump.h"
  47
  48 #include "draw_context.h"
  49 #include "draw_private.h"
  50 #include "draw_pipe.h"
  51
  52
  53 /** Approx number of new tokens for instructions in aa_transform_inst() */
  54 #define NUM_NEW_TOKENS 50
  55
  56
  57 /**
  58  * Max texture level for the alpha texture used for antialiasing
  59  */
  60 #define MAX_TEXTURE_LEVEL  5   /* 32 x 32 */
  61
  62
  63 /**
  64  * Subclass of pipe_shader_state to carry extra fragment shader info.
  65  */
  66 struct aaline_fragment_shader
  67 {
  68    struct pipe_shader_state state;
  69    void *driver_fs;
  70    void *aaline_fs;
  71    uint sampler_unit;
  72    int generic_attrib;  /**< texcoord/generic used for texture */
  73 };
  74
  75
  76 /**
  77  * Subclass of draw_stage
  78  */
  79 struct aaline_stage
  80 {
  81    struct draw_stage stage;
  82
  83    float half_line_width;
  84
  85    /** For AA lines, this is the vertex attrib slot for the new texcoords */
  86    uint tex_slot;
  87    /** position, not necessarily output zero */
  88    uint pos_slot;
  89
  90    void *sampler_cso;
  91    struct pipe_resource *texture;
  92    struct pipe_sampler_view *sampler_view;
  93    uint num_samplers;
  94    uint num_sampler_views;
  95
  96
  97    /*
  98     * Currently bound state
  99     */
 100    struct aaline_fragment_shader *fs;
 101    struct {
 102       void *sampler[PIPE_MAX_SAMPLERS];
 103       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 104    } state;
 105
 106    /*
 107     * Driver interface/override functions
 108     */
 109    void * (*driver_create_fs_state)(struct pipe_context *,
 110                                     const struct pipe_shader_state *);
 111    void (*driver_bind_fs_state)(struct pipe_context *, void *);
 112    void (*driver_delete_fs_state)(struct pipe_context *, void *);
 113
 114    void (*driver_bind_sampler_states)(struct pipe_context *, unsigned,
 115                                       void **);
 116
 117    void (*driver_set_sampler_views)(struct pipe_context *,
 118                                     unsigned,
 119                                     struct pipe_sampler_view **);
 120 };
 121
 122
 123
 124 /**
 125  * Subclass of tgsi_transform_context, used for transforming the
 126  * user's fragment shader to add the special AA instructions.
 127  */
 128 struct aa_transform_context {
 129    struct tgsi_transform_context base;
 130    uint tempsUsed;  /**< bitmask */
 131    int colorOutput; /**< which output is the primary color */
 132    uint samplersUsed;  /**< bitfield of samplers used */
 133    int freeSampler;  /** an available sampler for the pstipple */
 134    int maxInput, maxGeneric;  /**< max input index found */
 135    int colorTemp, texTemp;  /**< temp registers */
 136    boolean firstInstruction;
 137 };
 138
 139
 140 /**
 141  * TGSI declaration transform callback.
 142  * Look for a free sampler, a free input attrib, and two free temp regs.
 143  */
 144 static void
 145 aa_transform_decl(struct tgsi_transform_context *ctx,
 146                   struct tgsi_full_declaration *decl)
 147 {
 148    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 149
 150    if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
 151        decl->Semantic.Name == TGSI_SEMANTIC_COLOR &&
 152        decl->Semantic.Index == 0) {
 153       aactx->colorOutput = decl->Range.First;
 154    }
 155    else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
 156       uint i;
 157       for (i = decl->Range.First;
 158            i <= decl->Range.Last; i++) {
 159          aactx->samplersUsed |= 1 << i;
 160       }
 161    }
 162    else if (decl->Declaration.File == TGSI_FILE_INPUT) {
 163       if ((int) decl->Range.Last > aactx->maxInput)
 164          aactx->maxInput = decl->Range.Last;
 165       if (decl->Semantic.Name == TGSI_SEMANTIC_GENERIC &&
 166            (int) decl->Semantic.Index > aactx->maxGeneric) {
 167          aactx->maxGeneric = decl->Semantic.Index;
 168       }
 169    }
 170    else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
 171       uint i;
 172       for (i = decl->Range.First;
 173            i <= decl->Range.Last; i++) {
 174          aactx->tempsUsed |= (1 << i);
 175       }
 176    }
 177
 178    ctx->emit_declaration(ctx, decl);
 179 }
 180
 181
 182 /**
 183  * Find the lowest zero bit in the given word, or -1 if bitfield is all ones.
 184  */
 185 static int
 186 free_bit(uint bitfield)
 187 {
 188    return ffs(~bitfield) - 1;
 189 }
 190
 191
 192 /**
 193  * TGSI instruction transform callback.
 194  * Replace writes to result.color w/ a temp reg.
 195  * Upon END instruction, insert texture sampling code for antialiasing.
 196  */
 197 static void
 198 aa_transform_inst(struct tgsi_transform_context *ctx,
 199                   struct tgsi_full_instruction *inst)
 200 {
 201    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 202
 203    if (aactx->firstInstruction) {
 204       /* emit our new declarations before the first instruction */
 205
 206       struct tgsi_full_declaration decl;
 207       uint i;
 208
 209       /* find free sampler */
 210       aactx->freeSampler = free_bit(aactx->samplersUsed);
 211       if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
 212          aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
 213
 214       /* find two free temp regs */
 215       for (i = 0; i < 32; i++) {
 216          if ((aactx->tempsUsed & (1 << i)) == 0) {
 217             /* found a free temp */
 218             if (aactx->colorTemp < 0)
 219                aactx->colorTemp  = i;
 220             else if (aactx->texTemp < 0)
 221                aactx->texTemp  = i;
 222             else
 223                break;
 224          }
 225       }
 226       assert(aactx->colorTemp >= 0);
 227       assert(aactx->texTemp >= 0);
 228
 229       /* declare new generic input/texcoord */
 230       decl = tgsi_default_full_declaration();
 231       decl.Declaration.File = TGSI_FILE_INPUT;
 232       /* XXX this could be linear... */
 233       decl.Declaration.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
 234       decl.Declaration.Semantic = 1;
 235       decl.Semantic.Name = TGSI_SEMANTIC_GENERIC;
 236       decl.Semantic.Index = aactx->maxGeneric + 1;
 237       decl.Range.First =
 238       decl.Range.Last = aactx->maxInput + 1;
 239       ctx->emit_declaration(ctx, &decl);
 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 = aactx->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 = aactx->texTemp;
 253       ctx->emit_declaration(ctx, &decl);
 254
 255       decl = tgsi_default_full_declaration();
 256       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 257       decl.Range.First =
 258       decl.Range.Last = aactx->colorTemp;
 259       ctx->emit_declaration(ctx, &decl);
 260
 261       aactx->firstInstruction = FALSE;
 262    }
 263
 264    if (inst->Instruction.Opcode == TGSI_OPCODE_END &&
 265        aactx->colorOutput != -1) {
 266       struct tgsi_full_instruction newInst;
 267
 268       /* TEX */
 269       newInst = tgsi_default_full_instruction();
 270       newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
 271       newInst.Instruction.NumDstRegs = 1;
 272       newInst.Dst[0].Register.File = TGSI_FILE_TEMPORARY;
 273       newInst.Dst[0].Register.Index = aactx->texTemp;
 274       newInst.Instruction.NumSrcRegs = 2;
 275       newInst.Instruction.Texture = TRUE;
 276       newInst.Texture.Texture = TGSI_TEXTURE_2D;
 277       newInst.Src[0].Register.File = TGSI_FILE_INPUT;
 278       newInst.Src[0].Register.Index = aactx->maxInput + 1;
 279       newInst.Src[1].Register.File = TGSI_FILE_SAMPLER;
 280       newInst.Src[1].Register.Index = aactx->freeSampler;
 281
 282       ctx->emit_instruction(ctx, &newInst);
 283
 284       /* MOV rgb */
 285       newInst = tgsi_default_full_instruction();
 286       newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
 287       newInst.Instruction.NumDstRegs = 1;
 288       newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
 289       newInst.Dst[0].Register.Index = aactx->colorOutput;
 290       newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_XYZ;
 291       newInst.Instruction.NumSrcRegs = 1;
 292       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 293       newInst.Src[0].Register.Index = aactx->colorTemp;
 294       ctx->emit_instruction(ctx, &newInst);
 295
 296       /* MUL alpha */
 297       newInst = tgsi_default_full_instruction();
 298       newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
 299       newInst.Instruction.NumDstRegs = 1;
 300       newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
 301       newInst.Dst[0].Register.Index = aactx->colorOutput;
 302       newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_W;
 303       newInst.Instruction.NumSrcRegs = 2;
 304       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 305       newInst.Src[0].Register.Index = aactx->colorTemp;
 306       newInst.Src[1].Register.File = TGSI_FILE_TEMPORARY;
 307       newInst.Src[1].Register.Index = aactx->texTemp;
 308       ctx->emit_instruction(ctx, &newInst);
 309
 310       /* END */
 311       newInst = tgsi_default_full_instruction();
 312       newInst.Instruction.Opcode = TGSI_OPCODE_END;
 313       newInst.Instruction.NumDstRegs = 0;
 314       newInst.Instruction.NumSrcRegs = 0;
 315       ctx->emit_instruction(ctx, &newInst);
 316    }
 317    else {
 318       /* Not an END instruction.
 319        * Look for writes to result.color and replace with colorTemp reg.
 320        */
 321       uint i;
 322
 323       for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 324          struct tgsi_full_dst_register *dst = &inst->Dst[i];
 325          if (dst->Register.File == TGSI_FILE_OUTPUT &&
 326              dst->Register.Index == aactx->colorOutput) {
 327             dst->Register.File = TGSI_FILE_TEMPORARY;
 328             dst->Register.Index = aactx->colorTemp;
 329          }
 330       }
 331
 332       ctx->emit_instruction(ctx, inst);
 333    }
 334 }
 335
 336
 337 /**
 338  * Generate the frag shader we'll use for drawing AA lines.
 339  * This will be the user's shader plus some texture/modulate instructions.
 340  */
 341 static boolean
 342 generate_aaline_fs(struct aaline_stage *aaline)
 343 {
 344    struct pipe_context *pipe = aaline->stage.draw->pipe;
 345    const struct pipe_shader_state *orig_fs = &aaline->fs->state;
 346    struct pipe_shader_state aaline_fs;
 347    struct aa_transform_context transform;
 348    const uint newLen = tgsi_num_tokens(orig_fs->tokens) + NUM_NEW_TOKENS;
 349
 350    aaline_fs = *orig_fs; /* copy to init */
 351    aaline_fs.tokens = tgsi_alloc_tokens(newLen);
 352    if (aaline_fs.tokens == NULL)
 353       return FALSE;
 354
 355    memset(&transform, 0, sizeof(transform));
 356    transform.colorOutput = -1;
 357    transform.maxInput = -1;
 358    transform.maxGeneric = -1;
 359    transform.colorTemp = -1;
 360    transform.texTemp = -1;
 361    transform.firstInstruction = TRUE;
 362    transform.base.transform_instruction = aa_transform_inst;
 363    transform.base.transform_declaration = aa_transform_decl;
 364
 365    tgsi_transform_shader(orig_fs->tokens,
 366                          (struct tgsi_token *) aaline_fs.tokens,
 367                          newLen, &transform.base);
 368
 369 #if 0 /* DEBUG */
 370    tgsi_dump(orig_fs->tokens, 0);
 371    tgsi_dump(aaline_fs.tokens, 0);
 372 #endif
 373
 374    aaline->fs->sampler_unit = transform.freeSampler;
 375
 376    aaline->fs->aaline_fs
 377       = aaline->driver_create_fs_state(pipe, &aaline_fs);
 378    if (aaline->fs->aaline_fs == NULL)
 379       goto fail;
 380
 381    aaline->fs->generic_attrib = transform.maxGeneric + 1;
 382    FREE((void *)aaline_fs.tokens);
 383    return TRUE;
 384
 385 fail:
 386    FREE((void *)aaline_fs.tokens);
 387    return FALSE;
 388 }
 389
 390
 391 /**
 392  * Create the texture map we'll use for antialiasing the lines.
 393  */
 394 static boolean
 395 aaline_create_texture(struct aaline_stage *aaline)
 396 {
 397    struct pipe_context *pipe = aaline->stage.draw->pipe;
 398    struct pipe_screen *screen = pipe->screen;
 399    struct pipe_resource texTemp;
 400    struct pipe_sampler_view viewTempl;
 401    uint level;
 402
 403    memset(&texTemp, 0, sizeof(texTemp));
 404    texTemp.target = PIPE_TEXTURE_2D;
 405    texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
 406    texTemp.last_level = MAX_TEXTURE_LEVEL;
 407    texTemp.width0 = 1 << MAX_TEXTURE_LEVEL;
 408    texTemp.height0 = 1 << MAX_TEXTURE_LEVEL;
 409    texTemp.depth0 = 1;
 410    texTemp.bind = PIPE_BIND_SAMPLER_VIEW;
 411
 412    aaline->texture = screen->resource_create(screen, &texTemp);
 413    if (!aaline->texture)
 414       return FALSE;
 415
 416    u_sampler_view_default_template(&viewTempl,
 417                                    aaline->texture,
 418                                    aaline->texture->format);
 419    aaline->sampler_view = pipe->create_sampler_view(pipe,
 420                                                     aaline->texture,
 421                                                     &viewTempl);
 422    if (!aaline->sampler_view) {
 423       return FALSE;
 424    }
 425
 426    /* Fill in mipmap images.
 427     * Basically each level is solid opaque, except for the outermost
 428     * texels which are zero.  Special case the 1x1 and 2x2 levels.
 429     */
 430    for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
 431       struct pipe_transfer *transfer;
 432       struct pipe_box box;
 433       const uint size = u_minify(aaline->texture->width0, level);
 434       ubyte *data;
 435       uint i, j;
 436
 437       assert(aaline->texture->width0 == aaline->texture->height0);
 438
 439       u_box_origin_2d( size, size, &box );
 440
 441       /* This texture is new, no need to flush.
 442        */
 443       transfer = pipe->get_transfer(pipe,
 444                                     aaline->texture,
 445                                     u_subresource(0, level),
 446                                     PIPE_TRANSFER_WRITE,
 447                                     &box);
 448
 449       data = pipe->transfer_map(pipe, transfer);
 450       if (data == NULL)
 451          return FALSE;
 452
 453       for (i = 0; i < size; i++) {
 454          for (j = 0; j < size; j++) {
 455             ubyte d;
 456             if (size == 1) {
 457                d = 255;
 458             }
 459             else if (size == 2) {
 460                d = 200; /* tuneable */
 461             }
 462             else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
 463                d = 0;
 464             }
 465             else {
 466                d = 255;
 467             }
 468             data[i * transfer->stride + j] = d;
 469          }
 470       }
 471
 472       /* unmap */
 473       pipe->transfer_unmap(pipe, transfer);
 474       pipe->transfer_destroy(pipe, transfer);
 475    }
 476    return TRUE;
 477 }
 478
 479
 480 /**
 481  * Create the sampler CSO that'll be used for antialiasing.
 482  * By using a mipmapped texture, we don't have to generate a different
 483  * texture image for each line size.
 484  */
 485 static boolean
 486 aaline_create_sampler(struct aaline_stage *aaline)
 487 {
 488    struct pipe_sampler_state sampler;
 489    struct pipe_context *pipe = aaline->stage.draw->pipe;
 490
 491    memset(&sampler, 0, sizeof(sampler));
 492    sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 493    sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 494    sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 495    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
 496    sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
 497    sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
 498    sampler.normalized_coords = 1;
 499    sampler.min_lod = 0.0f;
 500    sampler.max_lod = MAX_TEXTURE_LEVEL;
 501
 502    aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 503    if (aaline->sampler_cso == NULL)
 504       return FALSE;
 505
 506    return TRUE;
 507 }
 508
 509
 510 /**
 511  * When we're about to draw our first AA line in a batch, this function is
 512  * called to tell the driver to bind our modified fragment shader.
 513  */
 514 static boolean
 515 bind_aaline_fragment_shader(struct aaline_stage *aaline)
 516 {
 517    struct draw_context *draw = aaline->stage.draw;
 518    struct pipe_context *pipe = draw->pipe;
 519
 520    if (!aaline->fs->aaline_fs &&
 521        !generate_aaline_fs(aaline))
 522       return FALSE;
 523
 524    draw->suspend_flushing = TRUE;
 525    aaline->driver_bind_fs_state(pipe, aaline->fs->aaline_fs);
 526    draw->suspend_flushing = FALSE;
 527
 528    return TRUE;
 529 }
 530
 531
 532
 533 static INLINE struct aaline_stage *
 534 aaline_stage( struct draw_stage *stage )
 535 {
 536    return (struct aaline_stage *) stage;
 537 }
 538
 539
 540 /**
 541  * Draw a wide line by drawing a quad, using geometry which will
 542  * fullfill GL's antialiased line requirements.
 543  */
 544 static void
 545 aaline_line(struct draw_stage *stage, struct prim_header *header)
 546 {
 547    const struct aaline_stage *aaline = aaline_stage(stage);
 548    const float half_width = aaline->half_line_width;
 549    struct prim_header tri;
 550    struct vertex_header *v[8];
 551    uint texPos = aaline->tex_slot;
 552    uint posPos = aaline->pos_slot;
 553    float *pos, *tex;
 554    float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
 555    float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
 556    double a = atan2(dy, dx);
 557    float c_a = (float) cos(a), s_a = (float) sin(a);
 558    uint i;
 559
 560    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 561    dx = 0.5F * half_width;
 562    dy = half_width;
 563
 564    /* allocate/dup new verts */
 565    for (i = 0; i < 8; i++) {
 566       v[i] = dup_vert(stage, header->v[i/4], i);
 567    }
 568
 569    /*
 570     * Quad strip for line from v0 to v1 (*=endpoints):
 571     *
 572     *  1   3                     5   7
 573     *  +---+---------------------+---+
 574     *  |                             |
 575     *  | *v0                     v1* |
 576     *  |                             |
 577     *  +---+---------------------+---+
 578     *  0   2                     4   6
 579     */
 580
 581    /* new verts */
 582    pos = v[0]->data[posPos];
 583    pos[0] += (-dx * c_a -  dy * s_a);
 584    pos[1] += (-dx * s_a +  dy * c_a);
 585
 586    pos = v[1]->data[posPos];
 587    pos[0] += (-dx * c_a - -dy * s_a);
 588    pos[1] += (-dx * s_a + -dy * c_a);
 589
 590    pos = v[2]->data[posPos];
 591    pos[0] += ( dx * c_a -  dy * s_a);
 592    pos[1] += ( dx * s_a +  dy * c_a);
 593
 594    pos = v[3]->data[posPos];
 595    pos[0] += ( dx * c_a - -dy * s_a);
 596    pos[1] += ( dx * s_a + -dy * c_a);
 597
 598    pos = v[4]->data[posPos];
 599    pos[0] += (-dx * c_a -  dy * s_a);
 600    pos[1] += (-dx * s_a +  dy * c_a);
 601
 602    pos = v[5]->data[posPos];
 603    pos[0] += (-dx * c_a - -dy * s_a);
 604    pos[1] += (-dx * s_a + -dy * c_a);
 605
 606    pos = v[6]->data[posPos];
 607    pos[0] += ( dx * c_a -  dy * s_a);
 608    pos[1] += ( dx * s_a +  dy * c_a);
 609
 610    pos = v[7]->data[posPos];
 611    pos[0] += ( dx * c_a - -dy * s_a);
 612    pos[1] += ( dx * s_a + -dy * c_a);
 613
 614    /* new texcoords */
 615    tex = v[0]->data[texPos];
 616    ASSIGN_4V(tex, 0, 0, 0, 1);
 617
 618    tex = v[1]->data[texPos];
 619    ASSIGN_4V(tex, 0, 1, 0, 1);
 620
 621    tex = v[2]->data[texPos];
 622    ASSIGN_4V(tex, .5, 0, 0, 1);
 623
 624    tex = v[3]->data[texPos];
 625    ASSIGN_4V(tex, .5, 1, 0, 1);
 626
 627    tex = v[4]->data[texPos];
 628    ASSIGN_4V(tex, .5, 0, 0, 1);
 629
 630    tex = v[5]->data[texPos];
 631    ASSIGN_4V(tex, .5, 1, 0, 1);
 632
 633    tex = v[6]->data[texPos];
 634    ASSIGN_4V(tex, 1, 0, 0, 1);
 635
 636    tex = v[7]->data[texPos];
 637    ASSIGN_4V(tex, 1, 1, 0, 1);
 638
 639    /* emit 6 tris for the quad strip */
 640    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 641    stage->next->tri( stage->next, &tri );
 642
 643    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 644    stage->next->tri( stage->next, &tri );
 645
 646    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 647    stage->next->tri( stage->next, &tri );
 648
 649    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 650    stage->next->tri( stage->next, &tri );
 651
 652    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 653    stage->next->tri( stage->next, &tri );
 654
 655    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 656    stage->next->tri( stage->next, &tri );
 657 }
 658
 659
 660 static void
 661 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 662 {
 663    auto struct aaline_stage *aaline = aaline_stage(stage);
 664    struct draw_context *draw = stage->draw;
 665    struct pipe_context *pipe = draw->pipe;
 666    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 667    uint num_samplers;
 668    void *r;
 669
 670    assert(draw->rasterizer->line_smooth);
 671
 672    if (draw->rasterizer->line_width <= 3.0)
 673       aaline->half_line_width = 1.5f;
 674    else
 675       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 676
 677    /*
 678     * Bind (generate) our fragprog, sampler and texture
 679     */
 680    if (!bind_aaline_fragment_shader(aaline)) {
 681       stage->line = draw_pipe_passthrough_line;
 682       stage->line(stage, header);
 683       return;
 684    }
 685
 686    /* update vertex attrib info */
 687    aaline->tex_slot = draw_current_shader_outputs(draw);
 688    aaline->pos_slot = draw_current_shader_position_output(draw);;
 689
 690    /* advertise the extra post-transformed vertex attribute */
 691    draw->extra_shader_outputs.semantic_name = TGSI_SEMANTIC_GENERIC;
 692    draw->extra_shader_outputs.semantic_index = aaline->fs->generic_attrib;
 693    draw->extra_shader_outputs.slot = aaline->tex_slot;
 694
 695    /* how many samplers? */
 696    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 697    num_samplers = MAX2(aaline->num_sampler_views, aaline->num_samplers);
 698    num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
 699
 700    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 701    pipe_sampler_view_reference(&aaline->state.sampler_views[aaline->fs->sampler_unit],
 702                                aaline->sampler_view);
 703
 704    draw->suspend_flushing = TRUE;
 705    aaline->driver_bind_sampler_states(pipe, num_samplers, aaline->state.sampler);
 706    aaline->driver_set_sampler_views(pipe, num_samplers, aaline->state.sampler_views);
 707
 708    /* Disable triangle culling, stippling, unfilled mode etc. */
 709    r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
 710    pipe->bind_rasterizer_state(pipe, r);
 711
 712    draw->suspend_flushing = FALSE;
 713
 714    /* now really draw first line */
 715    stage->line = aaline_line;
 716    stage->line(stage, header);
 717 }
 718
 719
 720 static void
 721 aaline_flush(struct draw_stage *stage, unsigned flags)
 722 {
 723    struct draw_context *draw = stage->draw;
 724    struct aaline_stage *aaline = aaline_stage(stage);
 725    struct pipe_context *pipe = draw->pipe;
 726
 727    stage->line = aaline_first_line;
 728    stage->next->flush( stage->next, flags );
 729
 730    /* restore original frag shader, texture, sampler state */
 731    draw->suspend_flushing = TRUE;
 732    aaline->driver_bind_fs_state(pipe, aaline->fs->driver_fs);
 733    aaline->driver_bind_sampler_states(pipe, aaline->num_samplers,
 734                                       aaline->state.sampler);
 735    aaline->driver_set_sampler_views(pipe,
 736                                     aaline->num_sampler_views,
 737                                     aaline->state.sampler_views);
 738
 739    /* restore original rasterizer state */
 740    if (draw->rast_handle) {
 741       pipe->bind_rasterizer_state(pipe, draw->rast_handle);
 742    }
 743
 744    draw->suspend_flushing = FALSE;
 745
 746    draw->extra_shader_outputs.slot = 0;
 747 }
 748
 749
 750 static void
 751 aaline_reset_stipple_counter(struct draw_stage *stage)
 752 {
 753    stage->next->reset_stipple_counter( stage->next );
 754 }
 755
 756
 757 static void
 758 aaline_destroy(struct draw_stage *stage)
 759 {
 760    struct aaline_stage *aaline = aaline_stage(stage);
 761    struct pipe_context *pipe = stage->draw->pipe;
 762    uint i;
 763
 764    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 765       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 766    }
 767
 768    if (aaline->sampler_cso)
 769       pipe->delete_sampler_state(pipe, aaline->sampler_cso);
 770
 771    if (aaline->texture)
 772       pipe_resource_reference(&aaline->texture, NULL);
 773
 774    if (aaline->sampler_view) {
 775       pipe_sampler_view_reference(&aaline->sampler_view, NULL);
 776    }
 777
 778    draw_free_temp_verts( stage );
 779
 780    FREE( stage );
 781 }
 782
 783
 784 static struct aaline_stage *
 785 draw_aaline_stage(struct draw_context *draw)
 786 {
 787    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 788    if (aaline == NULL)
 789       return NULL;
 790
 791    if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
 792       goto fail;
 793
 794    aaline->stage.draw = draw;
 795    aaline->stage.name = "aaline";
 796    aaline->stage.next = NULL;
 797    aaline->stage.point = draw_pipe_passthrough_point;
 798    aaline->stage.line = aaline_first_line;
 799    aaline->stage.tri = draw_pipe_passthrough_tri;
 800    aaline->stage.flush = aaline_flush;
 801    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 802    aaline->stage.destroy = aaline_destroy;
 803
 804    return aaline;
 805
 806  fail:
 807    if (aaline)
 808       aaline_destroy(&aaline->stage);
 809
 810    return NULL;
 811 }
 812
 813
 814 static struct aaline_stage *
 815 aaline_stage_from_pipe(struct pipe_context *pipe)
 816 {
 817    struct draw_context *draw = (struct draw_context *) pipe->draw;
 818    return aaline_stage(draw->pipeline.aaline);
 819 }
 820
 821
 822 /**
 823  * This function overrides the driver's create_fs_state() function and
 824  * will typically be called by the state tracker.
 825  */
 826 static void *
 827 aaline_create_fs_state(struct pipe_context *pipe,
 828                        const struct pipe_shader_state *fs)
 829 {
 830    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 831    struct aaline_fragment_shader *aafs = CALLOC_STRUCT(aaline_fragment_shader);
 832
 833    if (aafs == NULL)
 834       return NULL;
 835
 836    aafs->state = *fs;
 837
 838    /* pass-through */
 839    aafs->driver_fs = aaline->driver_create_fs_state(pipe, fs);
 840
 841    return aafs;
 842 }
 843
 844
 845 static void
 846 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 847 {
 848    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 849    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 850
 851    /* save current */
 852    aaline->fs = aafs;
 853    /* pass-through */
 854    aaline->driver_bind_fs_state(pipe, (aafs ? aafs->driver_fs : NULL));
 855 }
 856
 857
 858 static void
 859 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 860 {
 861    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 862    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 863
 864    /* pass-through */
 865    aaline->driver_delete_fs_state(pipe, aafs->driver_fs);
 866
 867    if (aafs->aaline_fs)
 868       aaline->driver_delete_fs_state(pipe, aafs->aaline_fs);
 869
 870    FREE(aafs);
 871 }
 872
 873
 874 static void
 875 aaline_bind_sampler_states(struct pipe_context *pipe,
 876                            unsigned num, void **sampler)
 877 {
 878    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 879
 880    /* save current */
 881    memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 882    aaline->num_samplers = num;
 883
 884    /* pass-through */
 885    aaline->driver_bind_sampler_states(pipe, num, sampler);
 886 }
 887
 888
 889 static void
 890 aaline_set_sampler_views(struct pipe_context *pipe,
 891                          unsigned num,
 892                          struct pipe_sampler_view **views)
 893 {
 894    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 895    uint i;
 896
 897    /* save current */
 898    for (i = 0; i < num; i++) {
 899       pipe_sampler_view_reference(&aaline->state.sampler_views[i], views[i]);
 900    }
 901    for ( ; i < PIPE_MAX_SAMPLERS; i++) {
 902       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 903    }
 904    aaline->num_sampler_views = num;
 905
 906    /* pass-through */
 907    aaline->driver_set_sampler_views(pipe, num, views);
 908 }
 909
 910
 911 /**
 912  * Called by drivers that want to install this AA line prim stage
 913  * into the draw module's pipeline.  This will not be used if the
 914  * hardware has native support for AA lines.
 915  */
 916 boolean
 917 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 918 {
 919    struct aaline_stage *aaline;
 920
 921    pipe->draw = (void *) draw;
 922
 923    /*
 924     * Create / install AA line drawing / prim stage
 925     */
 926    aaline = draw_aaline_stage( draw );
 927    if (!aaline)
 928       goto fail;
 929
 930    /* create special texture, sampler state */
 931    if (!aaline_create_texture(aaline))
 932       goto fail;
 933
 934    if (!aaline_create_sampler(aaline))
 935       goto fail;
 936
 937    /* save original driver functions */
 938    aaline->driver_create_fs_state = pipe->create_fs_state;
 939    aaline->driver_bind_fs_state = pipe->bind_fs_state;
 940    aaline->driver_delete_fs_state = pipe->delete_fs_state;
 941
 942    aaline->driver_bind_sampler_states = pipe->bind_fragment_sampler_states;
 943    aaline->driver_set_sampler_views = pipe->set_fragment_sampler_views;
 944
 945    /* override the driver's functions */
 946    pipe->create_fs_state = aaline_create_fs_state;
 947    pipe->bind_fs_state = aaline_bind_fs_state;
 948    pipe->delete_fs_state = aaline_delete_fs_state;
 949
 950    pipe->bind_fragment_sampler_states = aaline_bind_sampler_states;
 951    pipe->set_fragment_sampler_views = aaline_set_sampler_views;
 952
 953    /* Install once everything is known to be OK:
 954     */
 955    draw->pipeline.aaline = &aaline->stage;
 956
 957    return TRUE;
 958
 959  fail:
 960    if (aaline)
 961       aaline->stage.destroy( &aaline->stage );
 962
 963    return FALSE;
 964 }