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    void (*driver_set_sampler_views)(struct pipe_context *,
 117                                     unsigned,
 118                                     struct pipe_sampler_view **);
 119
 120    struct pipe_context *pipe;
 121 };
 122
 123
 124
 125 /**
 126  * Subclass of tgsi_transform_context, used for transforming the
 127  * user's fragment shader to add the special AA instructions.
 128  */
 129 struct aa_transform_context {
 130    struct tgsi_transform_context base;
 131    uint tempsUsed;  /**< bitmask */
 132    int colorOutput; /**< which output is the primary color */
 133    uint samplersUsed;  /**< bitfield of samplers used */
 134    int freeSampler;  /** an available sampler for the pstipple */
 135    int maxInput, maxGeneric;  /**< max input index found */
 136    int colorTemp, texTemp;  /**< temp registers */
 137    boolean firstInstruction;
 138 };
 139
 140
 141 /**
 142  * TGSI declaration transform callback.
 143  * Look for a free sampler, a free input attrib, and two free temp regs.
 144  */
 145 static void
 146 aa_transform_decl(struct tgsi_transform_context *ctx,
 147                   struct tgsi_full_declaration *decl)
 148 {
 149    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 150
 151    if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
 152        decl->Semantic.Name == TGSI_SEMANTIC_COLOR &&
 153        decl->Semantic.Index == 0) {
 154       aactx->colorOutput = decl->Range.First;
 155    }
 156    else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
 157       uint i;
 158       for (i = decl->Range.First;
 159            i <= decl->Range.Last; i++) {
 160          aactx->samplersUsed |= 1 << i;
 161       }
 162    }
 163    else if (decl->Declaration.File == TGSI_FILE_INPUT) {
 164       if ((int) decl->Range.Last > aactx->maxInput)
 165          aactx->maxInput = decl->Range.Last;
 166       if (decl->Semantic.Name == TGSI_SEMANTIC_GENERIC &&
 167            (int) decl->Semantic.Index > aactx->maxGeneric) {
 168          aactx->maxGeneric = decl->Semantic.Index;
 169       }
 170    }
 171    else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
 172       uint i;
 173       for (i = decl->Range.First;
 174            i <= decl->Range.Last; i++) {
 175          aactx->tempsUsed |= (1 << i);
 176       }
 177    }
 178
 179    ctx->emit_declaration(ctx, decl);
 180 }
 181
 182
 183 /**
 184  * Find the lowest zero bit in the given word, or -1 if bitfield is all ones.
 185  */
 186 static int
 187 free_bit(uint bitfield)
 188 {
 189    return ffs(~bitfield) - 1;
 190 }
 191
 192
 193 /**
 194  * TGSI instruction transform callback.
 195  * Replace writes to result.color w/ a temp reg.
 196  * Upon END instruction, insert texture sampling code for antialiasing.
 197  */
 198 static void
 199 aa_transform_inst(struct tgsi_transform_context *ctx,
 200                   struct tgsi_full_instruction *inst)
 201 {
 202    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 203
 204    if (aactx->firstInstruction) {
 205       /* emit our new declarations before the first instruction */
 206
 207       struct tgsi_full_declaration decl;
 208       uint i;
 209
 210       /* find free sampler */
 211       aactx->freeSampler = free_bit(aactx->samplersUsed);
 212       if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
 213          aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
 214
 215       /* find two free temp regs */
 216       for (i = 0; i < 32; i++) {
 217          if ((aactx->tempsUsed & (1 << i)) == 0) {
 218             /* found a free temp */
 219             if (aactx->colorTemp < 0)
 220                aactx->colorTemp  = i;
 221             else if (aactx->texTemp < 0)
 222                aactx->texTemp  = i;
 223             else
 224                break;
 225          }
 226       }
 227       assert(aactx->colorTemp >= 0);
 228       assert(aactx->texTemp >= 0);
 229
 230       /* declare new generic input/texcoord */
 231       decl = tgsi_default_full_declaration();
 232       decl.Declaration.File = TGSI_FILE_INPUT;
 233       /* XXX this could be linear... */
 234       decl.Declaration.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
 235       decl.Declaration.Semantic = 1;
 236       decl.Semantic.Name = TGSI_SEMANTIC_GENERIC;
 237       decl.Semantic.Index = aactx->maxGeneric + 1;
 238       decl.Range.First =
 239       decl.Range.Last = aactx->maxInput + 1;
 240       ctx->emit_declaration(ctx, &decl);
 241
 242       /* declare new sampler */
 243       decl = tgsi_default_full_declaration();
 244       decl.Declaration.File = TGSI_FILE_SAMPLER;
 245       decl.Range.First =
 246       decl.Range.Last = aactx->freeSampler;
 247       ctx->emit_declaration(ctx, &decl);
 248
 249       /* declare new temp regs */
 250       decl = tgsi_default_full_declaration();
 251       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 252       decl.Range.First =
 253       decl.Range.Last = aactx->texTemp;
 254       ctx->emit_declaration(ctx, &decl);
 255
 256       decl = tgsi_default_full_declaration();
 257       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 258       decl.Range.First =
 259       decl.Range.Last = aactx->colorTemp;
 260       ctx->emit_declaration(ctx, &decl);
 261
 262       aactx->firstInstruction = FALSE;
 263    }
 264
 265    if (inst->Instruction.Opcode == TGSI_OPCODE_END &&
 266        aactx->colorOutput != -1) {
 267       struct tgsi_full_instruction newInst;
 268
 269       /* TEX */
 270       newInst = tgsi_default_full_instruction();
 271       newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
 272       newInst.Instruction.NumDstRegs = 1;
 273       newInst.Dst[0].Register.File = TGSI_FILE_TEMPORARY;
 274       newInst.Dst[0].Register.Index = aactx->texTemp;
 275       newInst.Instruction.NumSrcRegs = 2;
 276       newInst.Instruction.Texture = TRUE;
 277       newInst.Texture.Texture = TGSI_TEXTURE_2D;
 278       newInst.Src[0].Register.File = TGSI_FILE_INPUT;
 279       newInst.Src[0].Register.Index = aactx->maxInput + 1;
 280       newInst.Src[1].Register.File = TGSI_FILE_SAMPLER;
 281       newInst.Src[1].Register.Index = aactx->freeSampler;
 282
 283       ctx->emit_instruction(ctx, &newInst);
 284
 285       /* MOV rgb */
 286       newInst = tgsi_default_full_instruction();
 287       newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
 288       newInst.Instruction.NumDstRegs = 1;
 289       newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
 290       newInst.Dst[0].Register.Index = aactx->colorOutput;
 291       newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_XYZ;
 292       newInst.Instruction.NumSrcRegs = 1;
 293       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 294       newInst.Src[0].Register.Index = aactx->colorTemp;
 295       ctx->emit_instruction(ctx, &newInst);
 296
 297       /* MUL alpha */
 298       newInst = tgsi_default_full_instruction();
 299       newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
 300       newInst.Instruction.NumDstRegs = 1;
 301       newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
 302       newInst.Dst[0].Register.Index = aactx->colorOutput;
 303       newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_W;
 304       newInst.Instruction.NumSrcRegs = 2;
 305       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 306       newInst.Src[0].Register.Index = aactx->colorTemp;
 307       newInst.Src[1].Register.File = TGSI_FILE_TEMPORARY;
 308       newInst.Src[1].Register.Index = aactx->texTemp;
 309       ctx->emit_instruction(ctx, &newInst);
 310
 311       /* END */
 312       newInst = tgsi_default_full_instruction();
 313       newInst.Instruction.Opcode = TGSI_OPCODE_END;
 314       newInst.Instruction.NumDstRegs = 0;
 315       newInst.Instruction.NumSrcRegs = 0;
 316       ctx->emit_instruction(ctx, &newInst);
 317    }
 318    else {
 319       /* Not an END instruction.
 320        * Look for writes to result.color and replace with colorTemp reg.
 321        */
 322       uint i;
 323
 324       for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 325          struct tgsi_full_dst_register *dst = &inst->Dst[i];
 326          if (dst->Register.File == TGSI_FILE_OUTPUT &&
 327              dst->Register.Index == aactx->colorOutput) {
 328             dst->Register.File = TGSI_FILE_TEMPORARY;
 329             dst->Register.Index = aactx->colorTemp;
 330          }
 331       }
 332
 333       ctx->emit_instruction(ctx, inst);
 334    }
 335 }
 336
 337
 338 /**
 339  * Generate the frag shader we'll use for drawing AA lines.
 340  * This will be the user's shader plus some texture/modulate instructions.
 341  */
 342 static boolean
 343 generate_aaline_fs(struct aaline_stage *aaline)
 344 {
 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(aaline->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->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->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
 519    if (!aaline->fs->aaline_fs &&
 520        !generate_aaline_fs(aaline))
 521       return FALSE;
 522
 523    draw->suspend_flushing = TRUE;
 524    aaline->driver_bind_fs_state(aaline->pipe, aaline->fs->aaline_fs);
 525    draw->suspend_flushing = FALSE;
 526
 527    return TRUE;
 528 }
 529
 530
 531
 532 static INLINE struct aaline_stage *
 533 aaline_stage( struct draw_stage *stage )
 534 {
 535    return (struct aaline_stage *) stage;
 536 }
 537
 538
 539 /**
 540  * Draw a wide line by drawing a quad, using geometry which will
 541  * fullfill GL's antialiased line requirements.
 542  */
 543 static void
 544 aaline_line(struct draw_stage *stage, struct prim_header *header)
 545 {
 546    const struct aaline_stage *aaline = aaline_stage(stage);
 547    const float half_width = aaline->half_line_width;
 548    struct prim_header tri;
 549    struct vertex_header *v[8];
 550    uint texPos = aaline->tex_slot;
 551    uint posPos = aaline->pos_slot;
 552    float *pos, *tex;
 553    float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
 554    float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
 555    double a = atan2(dy, dx);
 556    float c_a = (float) cos(a), s_a = (float) sin(a);
 557    uint i;
 558
 559    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 560    dx = 0.5F * half_width;
 561    dy = half_width;
 562
 563    /* allocate/dup new verts */
 564    for (i = 0; i < 8; i++) {
 565       v[i] = dup_vert(stage, header->v[i/4], i);
 566    }
 567
 568    /*
 569     * Quad strip for line from v0 to v1 (*=endpoints):
 570     *
 571     *  1   3                     5   7
 572     *  +---+---------------------+---+
 573     *  |                             |
 574     *  | *v0                     v1* |
 575     *  |                             |
 576     *  +---+---------------------+---+
 577     *  0   2                     4   6
 578     */
 579
 580    /* new verts */
 581    pos = v[0]->data[posPos];
 582    pos[0] += (-dx * c_a -  dy * s_a);
 583    pos[1] += (-dx * s_a +  dy * c_a);
 584
 585    pos = v[1]->data[posPos];
 586    pos[0] += (-dx * c_a - -dy * s_a);
 587    pos[1] += (-dx * s_a + -dy * c_a);
 588
 589    pos = v[2]->data[posPos];
 590    pos[0] += ( dx * c_a -  dy * s_a);
 591    pos[1] += ( dx * s_a +  dy * c_a);
 592
 593    pos = v[3]->data[posPos];
 594    pos[0] += ( dx * c_a - -dy * s_a);
 595    pos[1] += ( dx * s_a + -dy * c_a);
 596
 597    pos = v[4]->data[posPos];
 598    pos[0] += (-dx * c_a -  dy * s_a);
 599    pos[1] += (-dx * s_a +  dy * c_a);
 600
 601    pos = v[5]->data[posPos];
 602    pos[0] += (-dx * c_a - -dy * s_a);
 603    pos[1] += (-dx * s_a + -dy * c_a);
 604
 605    pos = v[6]->data[posPos];
 606    pos[0] += ( dx * c_a -  dy * s_a);
 607    pos[1] += ( dx * s_a +  dy * c_a);
 608
 609    pos = v[7]->data[posPos];
 610    pos[0] += ( dx * c_a - -dy * s_a);
 611    pos[1] += ( dx * s_a + -dy * c_a);
 612
 613    /* new texcoords */
 614    tex = v[0]->data[texPos];
 615    ASSIGN_4V(tex, 0, 0, 0, 1);
 616
 617    tex = v[1]->data[texPos];
 618    ASSIGN_4V(tex, 0, 1, 0, 1);
 619
 620    tex = v[2]->data[texPos];
 621    ASSIGN_4V(tex, .5, 0, 0, 1);
 622
 623    tex = v[3]->data[texPos];
 624    ASSIGN_4V(tex, .5, 1, 0, 1);
 625
 626    tex = v[4]->data[texPos];
 627    ASSIGN_4V(tex, .5, 0, 0, 1);
 628
 629    tex = v[5]->data[texPos];
 630    ASSIGN_4V(tex, .5, 1, 0, 1);
 631
 632    tex = v[6]->data[texPos];
 633    ASSIGN_4V(tex, 1, 0, 0, 1);
 634
 635    tex = v[7]->data[texPos];
 636    ASSIGN_4V(tex, 1, 1, 0, 1);
 637
 638    /* emit 6 tris for the quad strip */
 639    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 640    stage->next->tri( stage->next, &tri );
 641
 642    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 643    stage->next->tri( stage->next, &tri );
 644
 645    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 646    stage->next->tri( stage->next, &tri );
 647
 648    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 649    stage->next->tri( stage->next, &tri );
 650
 651    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 652    stage->next->tri( stage->next, &tri );
 653
 654    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 655    stage->next->tri( stage->next, &tri );
 656 }
 657
 658
 659 static void
 660 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 661 {
 662    auto struct aaline_stage *aaline = aaline_stage(stage);
 663    struct draw_context *draw = stage->draw;
 664    struct pipe_context *pipe = aaline->pipe;
 665    uint num_samplers;
 666
 667    assert(draw->rasterizer->line_smooth);
 668
 669    if (draw->rasterizer->line_width <= 3.0)
 670       aaline->half_line_width = 1.5f;
 671    else
 672       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 673
 674    /*
 675     * Bind (generate) our fragprog, sampler and texture
 676     */
 677    if (!bind_aaline_fragment_shader(aaline)) {
 678       stage->line = draw_pipe_passthrough_line;
 679       stage->line(stage, header);
 680       return;
 681    }
 682
 683    /* update vertex attrib info */
 684    aaline->tex_slot = draw_current_shader_outputs(draw);
 685    aaline->pos_slot = draw_current_shader_position_output(draw);;
 686
 687    /* advertise the extra post-transformed vertex attribute */
 688    draw->extra_shader_outputs.semantic_name = TGSI_SEMANTIC_GENERIC;
 689    draw->extra_shader_outputs.semantic_index = aaline->fs->generic_attrib;
 690    draw->extra_shader_outputs.slot = aaline->tex_slot;
 691
 692    /* how many samplers? */
 693    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 694    num_samplers = MAX2(aaline->num_sampler_views, aaline->num_samplers);
 695    num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
 696
 697    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 698    pipe_sampler_view_reference(&aaline->state.sampler_views[aaline->fs->sampler_unit],
 699                                aaline->sampler_view);
 700
 701    draw->suspend_flushing = TRUE;
 702    aaline->driver_bind_sampler_states(pipe, num_samplers, aaline->state.sampler);
 703    aaline->driver_set_sampler_views(pipe, num_samplers, aaline->state.sampler_views);
 704    draw->suspend_flushing = FALSE;
 705
 706    /* now really draw first line */
 707    stage->line = aaline_line;
 708    stage->line(stage, header);
 709 }
 710
 711
 712 static void
 713 aaline_flush(struct draw_stage *stage, unsigned flags)
 714 {
 715    struct draw_context *draw = stage->draw;
 716    struct aaline_stage *aaline = aaline_stage(stage);
 717    struct pipe_context *pipe = aaline->pipe;
 718
 719    stage->line = aaline_first_line;
 720    stage->next->flush( stage->next, flags );
 721
 722    /* restore original frag shader, texture, sampler state */
 723    draw->suspend_flushing = TRUE;
 724    aaline->driver_bind_fs_state(pipe, aaline->fs->driver_fs);
 725    aaline->driver_bind_sampler_states(pipe, aaline->num_samplers,
 726                                       aaline->state.sampler);
 727    aaline->driver_set_sampler_views(pipe,
 728                                     aaline->num_sampler_views,
 729                                     aaline->state.sampler_views);
 730    draw->suspend_flushing = FALSE;
 731
 732    draw->extra_shader_outputs.slot = 0;
 733 }
 734
 735
 736 static void
 737 aaline_reset_stipple_counter(struct draw_stage *stage)
 738 {
 739    stage->next->reset_stipple_counter( stage->next );
 740 }
 741
 742
 743 static void
 744 aaline_destroy(struct draw_stage *stage)
 745 {
 746    struct aaline_stage *aaline = aaline_stage(stage);
 747    uint i;
 748
 749    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 750       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 751    }
 752
 753    if (aaline->sampler_cso)
 754       aaline->pipe->delete_sampler_state(aaline->pipe, aaline->sampler_cso);
 755
 756    if (aaline->texture)
 757       pipe_resource_reference(&aaline->texture, NULL);
 758
 759    if (aaline->sampler_view) {
 760       pipe_sampler_view_reference(&aaline->sampler_view, NULL);
 761    }
 762
 763    draw_free_temp_verts( stage );
 764
 765    FREE( stage );
 766 }
 767
 768
 769 static struct aaline_stage *
 770 draw_aaline_stage(struct draw_context *draw)
 771 {
 772    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 773    if (aaline == NULL)
 774       return NULL;
 775
 776    if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
 777       goto fail;
 778
 779    aaline->stage.draw = draw;
 780    aaline->stage.name = "aaline";
 781    aaline->stage.next = NULL;
 782    aaline->stage.point = draw_pipe_passthrough_point;
 783    aaline->stage.line = aaline_first_line;
 784    aaline->stage.tri = draw_pipe_passthrough_tri;
 785    aaline->stage.flush = aaline_flush;
 786    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 787    aaline->stage.destroy = aaline_destroy;
 788
 789    return aaline;
 790
 791  fail:
 792    if (aaline)
 793       aaline_destroy(&aaline->stage);
 794
 795    return NULL;
 796 }
 797
 798
 799 static struct aaline_stage *
 800 aaline_stage_from_pipe(struct pipe_context *pipe)
 801 {
 802    struct draw_context *draw = (struct draw_context *) pipe->draw;
 803    return aaline_stage(draw->pipeline.aaline);
 804 }
 805
 806
 807 /**
 808  * This function overrides the driver's create_fs_state() function and
 809  * will typically be called by the state tracker.
 810  */
 811 static void *
 812 aaline_create_fs_state(struct pipe_context *pipe,
 813                        const struct pipe_shader_state *fs)
 814 {
 815    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 816    struct aaline_fragment_shader *aafs = CALLOC_STRUCT(aaline_fragment_shader);
 817    if (aafs == NULL)
 818       return NULL;
 819
 820    aafs->state = *fs;
 821
 822    /* pass-through */
 823    aafs->driver_fs = aaline->driver_create_fs_state(aaline->pipe, fs);
 824
 825    return aafs;
 826 }
 827
 828
 829 static void
 830 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 831 {
 832    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 833    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 834
 835    /* save current */
 836    aaline->fs = aafs;
 837    /* pass-through */
 838    aaline->driver_bind_fs_state(aaline->pipe,
 839                                 (aafs ? aafs->driver_fs : NULL));
 840 }
 841
 842
 843 static void
 844 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 845 {
 846    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 847    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 848    /* pass-through */
 849    aaline->driver_delete_fs_state(aaline->pipe, aafs->driver_fs);
 850
 851    if (aafs->aaline_fs)
 852       aaline->driver_delete_fs_state(aaline->pipe, aafs->aaline_fs);
 853
 854    FREE(aafs);
 855 }
 856
 857
 858 static void
 859 aaline_bind_sampler_states(struct pipe_context *pipe,
 860                            unsigned num, void **sampler)
 861 {
 862    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 863
 864    /* save current */
 865    memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 866    aaline->num_samplers = num;
 867
 868    /* pass-through */
 869    aaline->driver_bind_sampler_states(aaline->pipe, num, sampler);
 870 }
 871
 872
 873 static void
 874 aaline_set_sampler_views(struct pipe_context *pipe,
 875                          unsigned num,
 876                          struct pipe_sampler_view **views)
 877 {
 878    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 879    uint i;
 880
 881    /* save current */
 882    for (i = 0; i < num; i++) {
 883       pipe_sampler_view_reference(&aaline->state.sampler_views[i], views[i]);
 884    }
 885    for ( ; i < PIPE_MAX_SAMPLERS; i++) {
 886       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 887    }
 888    aaline->num_sampler_views = num;
 889
 890    /* pass-through */
 891    aaline->driver_set_sampler_views(aaline->pipe, num, views);
 892 }
 893
 894
 895 /**
 896  * Called by drivers that want to install this AA line prim stage
 897  * into the draw module's pipeline.  This will not be used if the
 898  * hardware has native support for AA lines.
 899  */
 900 boolean
 901 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 902 {
 903    struct aaline_stage *aaline;
 904
 905    pipe->draw = (void *) draw;
 906
 907    /*
 908     * Create / install AA line drawing / prim stage
 909     */
 910    aaline = draw_aaline_stage( draw );
 911    if (!aaline)
 912       goto fail;
 913
 914    aaline->pipe = pipe;
 915
 916    /* create special texture, sampler state */
 917    if (!aaline_create_texture(aaline))
 918       goto fail;
 919
 920    if (!aaline_create_sampler(aaline))
 921       goto fail;
 922
 923    /* save original driver functions */
 924    aaline->driver_create_fs_state = pipe->create_fs_state;
 925    aaline->driver_bind_fs_state = pipe->bind_fs_state;
 926    aaline->driver_delete_fs_state = pipe->delete_fs_state;
 927
 928    aaline->driver_bind_sampler_states = pipe->bind_fragment_sampler_states;
 929    aaline->driver_set_sampler_views = pipe->set_fragment_sampler_views;
 930
 931    /* override the driver's functions */
 932    pipe->create_fs_state = aaline_create_fs_state;
 933    pipe->bind_fs_state = aaline_bind_fs_state;
 934    pipe->delete_fs_state = aaline_delete_fs_state;
 935
 936    pipe->bind_fragment_sampler_states = aaline_bind_sampler_states;
 937    pipe->set_fragment_sampler_views = aaline_set_sampler_views;
 938
 939    /* Install once everything is known to be OK:
 940     */
 941    draw->pipeline.aaline = &aaline->stage;
 942
 943    return TRUE;
 944
 945  fail:
 946    if (aaline)
 947       aaline->stage.destroy( &aaline->stage );
 948
 949    return FALSE;
 950 }