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
  39 #include "util/u_format.h"
  40 #include "util/u_math.h"
  41 #include "util/u_memory.h"
  42
  43 #include "tgsi/tgsi_transform.h"
  44 #include "tgsi/tgsi_dump.h"
  45
  46 #include "draw_context.h"
  47 #include "draw_private.h"
  48 #include "draw_pipe.h"
  49
  50
  51 /**
  52  * Max texture level for the alpha texture used for antialiasing
  53  */
  54 #define MAX_TEXTURE_LEVEL  5   /* 32 x 32 */
  55
  56
  57 /**
  58  * Subclass of pipe_shader_state to carry extra fragment shader info.
  59  */
  60 struct aaline_fragment_shader
  61 {
  62    struct pipe_shader_state state;
  63    void *driver_fs;
  64    void *aaline_fs;
  65    uint sampler_unit;
  66    int generic_attrib;  /**< texcoord/generic used for texture */
  67 };
  68
  69
  70 /**
  71  * Subclass of draw_stage
  72  */
  73 struct aaline_stage
  74 {
  75    struct draw_stage stage;
  76
  77    float half_line_width;
  78
  79    /** For AA lines, this is the vertex attrib slot for the new texcoords */
  80    uint tex_slot;
  81    /** position, not necessarily output zero */
  82    uint pos_slot;
  83
  84    void *sampler_cso;
  85    struct pipe_texture *texture;
  86    uint num_samplers;
  87    uint num_textures;
  88
  89
  90    /*
  91     * Currently bound state
  92     */
  93    struct aaline_fragment_shader *fs;
  94    struct {
  95       void *sampler[PIPE_MAX_SAMPLERS];
  96       struct pipe_texture *texture[PIPE_MAX_SAMPLERS];
  97    } state;
  98
  99    /*
 100     * Driver interface/override functions
 101     */
 102    void * (*driver_create_fs_state)(struct pipe_context *,
 103                                     const struct pipe_shader_state *);
 104    void (*driver_bind_fs_state)(struct pipe_context *, void *);
 105    void (*driver_delete_fs_state)(struct pipe_context *, void *);
 106
 107    void (*driver_bind_sampler_states)(struct pipe_context *, unsigned,
 108                                       void **);
 109    void (*driver_set_sampler_textures)(struct pipe_context *, unsigned,
 110                                        struct pipe_texture **);
 111
 112    struct pipe_context *pipe;
 113 };
 114
 115
 116
 117 /**
 118  * Subclass of tgsi_transform_context, used for transforming the
 119  * user's fragment shader to add the special AA instructions.
 120  */
 121 struct aa_transform_context {
 122    struct tgsi_transform_context base;
 123    uint tempsUsed;  /**< bitmask */
 124    int colorOutput; /**< which output is the primary color */
 125    uint samplersUsed;  /**< bitfield of samplers used */
 126    int freeSampler;  /** an available sampler for the pstipple */
 127    int maxInput, maxGeneric;  /**< max input index found */
 128    int colorTemp, texTemp;  /**< temp registers */
 129    boolean firstInstruction;
 130 };
 131
 132
 133 /**
 134  * TGSI declaration transform callback.
 135  * Look for a free sampler, a free input attrib, and two free temp regs.
 136  */
 137 static void
 138 aa_transform_decl(struct tgsi_transform_context *ctx,
 139                   struct tgsi_full_declaration *decl)
 140 {
 141    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 142
 143    if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
 144        decl->Semantic.Name == TGSI_SEMANTIC_COLOR &&
 145        decl->Semantic.Index == 0) {
 146       aactx->colorOutput = decl->Range.First;
 147    }
 148    else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
 149       uint i;
 150       for (i = decl->Range.First;
 151            i <= decl->Range.Last; i++) {
 152          aactx->samplersUsed |= 1 << i;
 153       }
 154    }
 155    else if (decl->Declaration.File == TGSI_FILE_INPUT) {
 156       if ((int) decl->Range.Last > aactx->maxInput)
 157          aactx->maxInput = decl->Range.Last;
 158       if (decl->Semantic.Name == TGSI_SEMANTIC_GENERIC &&
 159            (int) decl->Semantic.Index > aactx->maxGeneric) {
 160          aactx->maxGeneric = decl->Semantic.Index;
 161       }
 162    }
 163    else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
 164       uint i;
 165       for (i = decl->Range.First;
 166            i <= decl->Range.Last; i++) {
 167          aactx->tempsUsed |= (1 << i);
 168       }
 169    }
 170
 171    ctx->emit_declaration(ctx, decl);
 172 }
 173
 174
 175 /**
 176  * Find the lowest zero bit in the given word, or -1 if bitfield is all ones.
 177  */
 178 static int
 179 free_bit(uint bitfield)
 180 {
 181    int i;
 182    for (i = 0; i < 32; i++) {
 183       if ((bitfield & (1 << i)) == 0)
 184          return i;
 185    }
 186    return -1;
 187 }
 188
 189
 190 /**
 191  * TGSI instruction transform callback.
 192  * Replace writes to result.color w/ a temp reg.
 193  * Upon END instruction, insert texture sampling code for antialiasing.
 194  */
 195 static void
 196 aa_transform_inst(struct tgsi_transform_context *ctx,
 197                   struct tgsi_full_instruction *inst)
 198 {
 199    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 200
 201    if (aactx->firstInstruction) {
 202       /* emit our new declarations before the first instruction */
 203
 204       struct tgsi_full_declaration decl;
 205       uint i;
 206
 207       /* find free sampler */
 208       aactx->freeSampler = free_bit(aactx->samplersUsed);
 209       if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
 210          aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
 211
 212       /* find two free temp regs */
 213       for (i = 0; i < 32; i++) {
 214          if ((aactx->tempsUsed & (1 << i)) == 0) {
 215             /* found a free temp */
 216             if (aactx->colorTemp < 0)
 217                aactx->colorTemp  = i;
 218             else if (aactx->texTemp < 0)
 219                aactx->texTemp  = i;
 220             else
 221                break;
 222          }
 223       }
 224       assert(aactx->colorTemp >= 0);
 225       assert(aactx->texTemp >= 0);
 226
 227       /* declare new generic input/texcoord */
 228       decl = tgsi_default_full_declaration();
 229       decl.Declaration.File = TGSI_FILE_INPUT;
 230       /* XXX this could be linear... */
 231       decl.Declaration.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
 232       decl.Declaration.Semantic = 1;
 233       decl.Semantic.Name = TGSI_SEMANTIC_GENERIC;
 234       decl.Semantic.Index = aactx->maxGeneric + 1;
 235       decl.Range.First =
 236       decl.Range.Last = aactx->maxInput + 1;
 237       ctx->emit_declaration(ctx, &decl);
 238
 239       /* declare new sampler */
 240       decl = tgsi_default_full_declaration();
 241       decl.Declaration.File = TGSI_FILE_SAMPLER;
 242       decl.Range.First =
 243       decl.Range.Last = aactx->freeSampler;
 244       ctx->emit_declaration(ctx, &decl);
 245
 246       /* declare new temp regs */
 247       decl = tgsi_default_full_declaration();
 248       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 249       decl.Range.First =
 250       decl.Range.Last = aactx->texTemp;
 251       ctx->emit_declaration(ctx, &decl);
 252
 253       decl = tgsi_default_full_declaration();
 254       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 255       decl.Range.First =
 256       decl.Range.Last = aactx->colorTemp;
 257       ctx->emit_declaration(ctx, &decl);
 258
 259       aactx->firstInstruction = FALSE;
 260    }
 261
 262    if (inst->Instruction.Opcode == TGSI_OPCODE_END &&
 263        aactx->colorOutput != -1) {
 264       struct tgsi_full_instruction newInst;
 265
 266       /* TEX */
 267       newInst = tgsi_default_full_instruction();
 268       newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
 269       newInst.Instruction.NumDstRegs = 1;
 270       newInst.Dst[0].Register.File = TGSI_FILE_TEMPORARY;
 271       newInst.Dst[0].Register.Index = aactx->texTemp;
 272       newInst.Instruction.NumSrcRegs = 2;
 273       newInst.Instruction.Texture = TRUE;
 274       newInst.Texture.Texture = TGSI_TEXTURE_2D;
 275       newInst.Src[0].Register.File = TGSI_FILE_INPUT;
 276       newInst.Src[0].Register.Index = aactx->maxInput + 1;
 277       newInst.Src[1].Register.File = TGSI_FILE_SAMPLER;
 278       newInst.Src[1].Register.Index = aactx->freeSampler;
 279
 280       ctx->emit_instruction(ctx, &newInst);
 281
 282       /* MOV rgb */
 283       newInst = tgsi_default_full_instruction();
 284       newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
 285       newInst.Instruction.NumDstRegs = 1;
 286       newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
 287       newInst.Dst[0].Register.Index = aactx->colorOutput;
 288       newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_XYZ;
 289       newInst.Instruction.NumSrcRegs = 1;
 290       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 291       newInst.Src[0].Register.Index = aactx->colorTemp;
 292       ctx->emit_instruction(ctx, &newInst);
 293
 294       /* MUL alpha */
 295       newInst = tgsi_default_full_instruction();
 296       newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
 297       newInst.Instruction.NumDstRegs = 1;
 298       newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
 299       newInst.Dst[0].Register.Index = aactx->colorOutput;
 300       newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_W;
 301       newInst.Instruction.NumSrcRegs = 2;
 302       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 303       newInst.Src[0].Register.Index = aactx->colorTemp;
 304       newInst.Src[1].Register.File = TGSI_FILE_TEMPORARY;
 305       newInst.Src[1].Register.Index = aactx->texTemp;
 306       ctx->emit_instruction(ctx, &newInst);
 307
 308       /* END */
 309       newInst = tgsi_default_full_instruction();
 310       newInst.Instruction.Opcode = TGSI_OPCODE_END;
 311       newInst.Instruction.NumDstRegs = 0;
 312       newInst.Instruction.NumSrcRegs = 0;
 313       ctx->emit_instruction(ctx, &newInst);
 314    }
 315    else {
 316       /* Not an END instruction.
 317        * Look for writes to result.color and replace with colorTemp reg.
 318        */
 319       uint i;
 320
 321       for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 322          struct tgsi_full_dst_register *dst = &inst->Dst[i];
 323          if (dst->Register.File == TGSI_FILE_OUTPUT &&
 324              dst->Register.Index == aactx->colorOutput) {
 325             dst->Register.File = TGSI_FILE_TEMPORARY;
 326             dst->Register.Index = aactx->colorTemp;
 327          }
 328       }
 329
 330       ctx->emit_instruction(ctx, inst);
 331    }
 332 }
 333
 334
 335 /**
 336  * Generate the frag shader we'll use for drawing AA lines.
 337  * This will be the user's shader plus some texture/modulate instructions.
 338  */
 339 static boolean
 340 generate_aaline_fs(struct aaline_stage *aaline)
 341 {
 342    const struct pipe_shader_state *orig_fs = &aaline->fs->state;
 343    struct pipe_shader_state aaline_fs;
 344    struct aa_transform_context transform;
 345
 346 #define MAX 1000
 347
 348    aaline_fs = *orig_fs; /* copy to init */
 349    aaline_fs.tokens = MALLOC(sizeof(struct tgsi_token) * MAX);
 350    if (aaline_fs.tokens == NULL)
 351       return FALSE;
 352
 353    memset(&transform, 0, sizeof(transform));
 354    transform.colorOutput = -1;
 355    transform.maxInput = -1;
 356    transform.maxGeneric = -1;
 357    transform.colorTemp = -1;
 358    transform.texTemp = -1;
 359    transform.firstInstruction = TRUE;
 360    transform.base.transform_instruction = aa_transform_inst;
 361    transform.base.transform_declaration = aa_transform_decl;
 362
 363    tgsi_transform_shader(orig_fs->tokens,
 364                          (struct tgsi_token *) aaline_fs.tokens,
 365                          MAX, &transform.base);
 366
 367 #if 0 /* DEBUG */
 368    tgsi_dump(orig_fs->tokens, 0);
 369    tgsi_dump(aaline_fs.tokens, 0);
 370 #endif
 371
 372    aaline->fs->sampler_unit = transform.freeSampler;
 373
 374    aaline->fs->aaline_fs
 375       = aaline->driver_create_fs_state(aaline->pipe, &aaline_fs);
 376    if (aaline->fs->aaline_fs == NULL)
 377       goto fail;
 378
 379    aaline->fs->generic_attrib = transform.maxGeneric + 1;
 380    FREE((void *)aaline_fs.tokens);
 381    return TRUE;
 382
 383 fail:
 384    FREE((void *)aaline_fs.tokens);
 385    return FALSE;
 386 }
 387
 388
 389 /**
 390  * Create the texture map we'll use for antialiasing the lines.
 391  */
 392 static boolean
 393 aaline_create_texture(struct aaline_stage *aaline)
 394 {
 395    struct pipe_context *pipe = aaline->pipe;
 396    struct pipe_screen *screen = pipe->screen;
 397    struct pipe_texture texTemp;
 398    uint level;
 399
 400    memset(&texTemp, 0, sizeof(texTemp));
 401    texTemp.target = PIPE_TEXTURE_2D;
 402    texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
 403    texTemp.last_level = MAX_TEXTURE_LEVEL;
 404    texTemp.width0 = 1 << MAX_TEXTURE_LEVEL;
 405    texTemp.height0 = 1 << MAX_TEXTURE_LEVEL;
 406    texTemp.depth0 = 1;
 407
 408    aaline->texture = screen->texture_create(screen, &texTemp);
 409    if (!aaline->texture)
 410       return FALSE;
 411
 412    /* Fill in mipmap images.
 413     * Basically each level is solid opaque, except for the outermost
 414     * texels which are zero.  Special case the 1x1 and 2x2 levels.
 415     */
 416    for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
 417       struct pipe_transfer *transfer;
 418       const uint size = u_minify(aaline->texture->width0, level);
 419       ubyte *data;
 420       uint i, j;
 421
 422       assert(aaline->texture->width0 == aaline->texture->height0);
 423
 424       /* This texture is new, no need to flush.
 425        */
 426       transfer = screen->get_tex_transfer(screen, aaline->texture, 0, level, 0,
 427                                          PIPE_TRANSFER_WRITE, 0, 0, size, size);
 428       data = screen->transfer_map(screen, transfer);
 429       if (data == NULL)
 430          return FALSE;
 431
 432       for (i = 0; i < size; i++) {
 433          for (j = 0; j < size; j++) {
 434             ubyte d;
 435             if (size == 1) {
 436                d = 255;
 437             }
 438             else if (size == 2) {
 439                d = 200; /* tuneable */
 440             }
 441             else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
 442                d = 0;
 443             }
 444             else {
 445                d = 255;
 446             }
 447             data[i * transfer->stride + j] = d;
 448          }
 449       }
 450
 451       /* unmap */
 452       screen->transfer_unmap(screen, transfer);
 453       screen->tex_transfer_destroy(transfer);
 454    }
 455    return TRUE;
 456 }
 457
 458
 459 /**
 460  * Create the sampler CSO that'll be used for antialiasing.
 461  * By using a mipmapped texture, we don't have to generate a different
 462  * texture image for each line size.
 463  */
 464 static boolean
 465 aaline_create_sampler(struct aaline_stage *aaline)
 466 {
 467    struct pipe_sampler_state sampler;
 468    struct pipe_context *pipe = aaline->pipe;
 469
 470    memset(&sampler, 0, sizeof(sampler));
 471    sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 472    sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 473    sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 474    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
 475    sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
 476    sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
 477    sampler.normalized_coords = 1;
 478    sampler.min_lod = 0.0f;
 479    sampler.max_lod = MAX_TEXTURE_LEVEL;
 480
 481    aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 482    if (aaline->sampler_cso == NULL)
 483       return FALSE;
 484
 485    return TRUE;
 486 }
 487
 488
 489 /**
 490  * When we're about to draw our first AA line in a batch, this function is
 491  * called to tell the driver to bind our modified fragment shader.
 492  */
 493 static boolean
 494 bind_aaline_fragment_shader(struct aaline_stage *aaline)
 495 {
 496    struct draw_context *draw = aaline->stage.draw;
 497
 498    if (!aaline->fs->aaline_fs &&
 499        !generate_aaline_fs(aaline))
 500       return FALSE;
 501
 502    draw->suspend_flushing = TRUE;
 503    aaline->driver_bind_fs_state(aaline->pipe, aaline->fs->aaline_fs);
 504    draw->suspend_flushing = FALSE;
 505
 506    return TRUE;
 507 }
 508
 509
 510
 511 static INLINE struct aaline_stage *
 512 aaline_stage( struct draw_stage *stage )
 513 {
 514    return (struct aaline_stage *) stage;
 515 }
 516
 517
 518 /**
 519  * Draw a wide line by drawing a quad, using geometry which will
 520  * fullfill GL's antialiased line requirements.
 521  */
 522 static void
 523 aaline_line(struct draw_stage *stage, struct prim_header *header)
 524 {
 525    const struct aaline_stage *aaline = aaline_stage(stage);
 526    const float half_width = aaline->half_line_width;
 527    struct prim_header tri;
 528    struct vertex_header *v[8];
 529    uint texPos = aaline->tex_slot;
 530    uint posPos = aaline->pos_slot;
 531    float *pos, *tex;
 532    float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
 533    float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
 534    double a = atan2(dy, dx);
 535    float c_a = (float) cos(a), s_a = (float) sin(a);
 536    uint i;
 537
 538    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 539    dx = 0.5F * half_width;
 540    dy = half_width;
 541
 542    /* allocate/dup new verts */
 543    for (i = 0; i < 8; i++) {
 544       v[i] = dup_vert(stage, header->v[i/4], i);
 545    }
 546
 547    /*
 548     * Quad strip for line from v0 to v1 (*=endpoints):
 549     *
 550     *  1   3                     5   7
 551     *  +---+---------------------+---+
 552     *  |                             |
 553     *  | *v0                     v1* |
 554     *  |                             |
 555     *  +---+---------------------+---+
 556     *  0   2                     4   6
 557     */
 558
 559    /* new verts */
 560    pos = v[0]->data[posPos];
 561    pos[0] += (-dx * c_a -  dy * s_a);
 562    pos[1] += (-dx * s_a +  dy * c_a);
 563
 564    pos = v[1]->data[posPos];
 565    pos[0] += (-dx * c_a - -dy * s_a);
 566    pos[1] += (-dx * s_a + -dy * c_a);
 567
 568    pos = v[2]->data[posPos];
 569    pos[0] += ( dx * c_a -  dy * s_a);
 570    pos[1] += ( dx * s_a +  dy * c_a);
 571
 572    pos = v[3]->data[posPos];
 573    pos[0] += ( dx * c_a - -dy * s_a);
 574    pos[1] += ( dx * s_a + -dy * c_a);
 575
 576    pos = v[4]->data[posPos];
 577    pos[0] += (-dx * c_a -  dy * s_a);
 578    pos[1] += (-dx * s_a +  dy * c_a);
 579
 580    pos = v[5]->data[posPos];
 581    pos[0] += (-dx * c_a - -dy * s_a);
 582    pos[1] += (-dx * s_a + -dy * c_a);
 583
 584    pos = v[6]->data[posPos];
 585    pos[0] += ( dx * c_a -  dy * s_a);
 586    pos[1] += ( dx * s_a +  dy * c_a);
 587
 588    pos = v[7]->data[posPos];
 589    pos[0] += ( dx * c_a - -dy * s_a);
 590    pos[1] += ( dx * s_a + -dy * c_a);
 591
 592    /* new texcoords */
 593    tex = v[0]->data[texPos];
 594    ASSIGN_4V(tex, 0, 0, 0, 1);
 595
 596    tex = v[1]->data[texPos];
 597    ASSIGN_4V(tex, 0, 1, 0, 1);
 598
 599    tex = v[2]->data[texPos];
 600    ASSIGN_4V(tex, .5, 0, 0, 1);
 601
 602    tex = v[3]->data[texPos];
 603    ASSIGN_4V(tex, .5, 1, 0, 1);
 604
 605    tex = v[4]->data[texPos];
 606    ASSIGN_4V(tex, .5, 0, 0, 1);
 607
 608    tex = v[5]->data[texPos];
 609    ASSIGN_4V(tex, .5, 1, 0, 1);
 610
 611    tex = v[6]->data[texPos];
 612    ASSIGN_4V(tex, 1, 0, 0, 1);
 613
 614    tex = v[7]->data[texPos];
 615    ASSIGN_4V(tex, 1, 1, 0, 1);
 616
 617    /* emit 6 tris for the quad strip */
 618    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 619    stage->next->tri( stage->next, &tri );
 620
 621    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 622    stage->next->tri( stage->next, &tri );
 623
 624    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 625    stage->next->tri( stage->next, &tri );
 626
 627    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 628    stage->next->tri( stage->next, &tri );
 629
 630    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 631    stage->next->tri( stage->next, &tri );
 632
 633    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 634    stage->next->tri( stage->next, &tri );
 635 }
 636
 637
 638 static void
 639 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 640 {
 641    auto struct aaline_stage *aaline = aaline_stage(stage);
 642    struct draw_context *draw = stage->draw;
 643    struct pipe_context *pipe = aaline->pipe;
 644    uint num_samplers;
 645
 646    assert(draw->rasterizer->line_smooth);
 647
 648    if (draw->rasterizer->line_width <= 3.0)
 649       aaline->half_line_width = 1.5f;
 650    else
 651       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 652
 653    /*
 654     * Bind (generate) our fragprog, sampler and texture
 655     */
 656    if (!bind_aaline_fragment_shader(aaline)) {
 657       stage->line = draw_pipe_passthrough_line;
 658       stage->line(stage, header);
 659       return;
 660    }
 661
 662    /* update vertex attrib info */
 663    aaline->tex_slot = draw_current_shader_outputs(draw);
 664    aaline->pos_slot = draw_current_shader_position_output(draw);;
 665
 666    /* advertise the extra post-transformed vertex attribute */
 667    draw->extra_shader_outputs.semantic_name = TGSI_SEMANTIC_GENERIC;
 668    draw->extra_shader_outputs.semantic_index = aaline->fs->generic_attrib;
 669    draw->extra_shader_outputs.slot = aaline->tex_slot;
 670
 671    /* how many samplers? */
 672    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 673    num_samplers = MAX2(aaline->num_textures, aaline->num_samplers);
 674    num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
 675
 676    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 677    pipe_texture_reference(&aaline->state.texture[aaline->fs->sampler_unit],
 678                           aaline->texture);
 679
 680    draw->suspend_flushing = TRUE;
 681    aaline->driver_bind_sampler_states(pipe, num_samplers, aaline->state.sampler);
 682    aaline->driver_set_sampler_textures(pipe, num_samplers, aaline->state.texture);
 683    draw->suspend_flushing = FALSE;
 684
 685    /* now really draw first line */
 686    stage->line = aaline_line;
 687    stage->line(stage, header);
 688 }
 689
 690
 691 static void
 692 aaline_flush(struct draw_stage *stage, unsigned flags)
 693 {
 694    struct draw_context *draw = stage->draw;
 695    struct aaline_stage *aaline = aaline_stage(stage);
 696    struct pipe_context *pipe = aaline->pipe;
 697
 698    stage->line = aaline_first_line;
 699    stage->next->flush( stage->next, flags );
 700
 701    /* restore original frag shader, texture, sampler state */
 702    draw->suspend_flushing = TRUE;
 703    aaline->driver_bind_fs_state(pipe, aaline->fs->driver_fs);
 704    aaline->driver_bind_sampler_states(pipe, aaline->num_samplers,
 705                                       aaline->state.sampler);
 706    aaline->driver_set_sampler_textures(pipe, aaline->num_textures,
 707                                        aaline->state.texture);
 708    draw->suspend_flushing = FALSE;
 709
 710    draw->extra_shader_outputs.slot = 0;
 711 }
 712
 713
 714 static void
 715 aaline_reset_stipple_counter(struct draw_stage *stage)
 716 {
 717    stage->next->reset_stipple_counter( stage->next );
 718 }
 719
 720
 721 static void
 722 aaline_destroy(struct draw_stage *stage)
 723 {
 724    struct aaline_stage *aaline = aaline_stage(stage);
 725    uint i;
 726
 727    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 728       pipe_texture_reference(&aaline->state.texture[i], NULL);
 729    }
 730
 731    if (aaline->sampler_cso)
 732       aaline->pipe->delete_sampler_state(aaline->pipe, aaline->sampler_cso);
 733
 734    if (aaline->texture)
 735       pipe_texture_reference(&aaline->texture, NULL);
 736
 737    draw_free_temp_verts( stage );
 738
 739    FREE( stage );
 740 }
 741
 742
 743 static struct aaline_stage *
 744 draw_aaline_stage(struct draw_context *draw)
 745 {
 746    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 747    if (aaline == NULL)
 748       return NULL;
 749
 750    if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
 751       goto fail;
 752
 753    aaline->stage.draw = draw;
 754    aaline->stage.name = "aaline";
 755    aaline->stage.next = NULL;
 756    aaline->stage.point = draw_pipe_passthrough_point;
 757    aaline->stage.line = aaline_first_line;
 758    aaline->stage.tri = draw_pipe_passthrough_tri;
 759    aaline->stage.flush = aaline_flush;
 760    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 761    aaline->stage.destroy = aaline_destroy;
 762
 763    return aaline;
 764
 765  fail:
 766    if (aaline)
 767       aaline_destroy(&aaline->stage);
 768
 769    return NULL;
 770 }
 771
 772
 773 static struct aaline_stage *
 774 aaline_stage_from_pipe(struct pipe_context *pipe)
 775 {
 776    struct draw_context *draw = (struct draw_context *) pipe->draw;
 777    return aaline_stage(draw->pipeline.aaline);
 778 }
 779
 780
 781 /**
 782  * This function overrides the driver's create_fs_state() function and
 783  * will typically be called by the state tracker.
 784  */
 785 static void *
 786 aaline_create_fs_state(struct pipe_context *pipe,
 787                        const struct pipe_shader_state *fs)
 788 {
 789    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 790    struct aaline_fragment_shader *aafs = CALLOC_STRUCT(aaline_fragment_shader);
 791    if (aafs == NULL)
 792       return NULL;
 793
 794    aafs->state = *fs;
 795
 796    /* pass-through */
 797    aafs->driver_fs = aaline->driver_create_fs_state(aaline->pipe, fs);
 798
 799    return aafs;
 800 }
 801
 802
 803 static void
 804 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 805 {
 806    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 807    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 808
 809    /* save current */
 810    aaline->fs = aafs;
 811    /* pass-through */
 812    aaline->driver_bind_fs_state(aaline->pipe,
 813                                 (aafs ? aafs->driver_fs : NULL));
 814 }
 815
 816
 817 static void
 818 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 819 {
 820    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 821    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 822    /* pass-through */
 823    aaline->driver_delete_fs_state(aaline->pipe, aafs->driver_fs);
 824
 825    if (aafs->aaline_fs)
 826       aaline->driver_delete_fs_state(aaline->pipe, aafs->aaline_fs);
 827
 828    FREE(aafs);
 829 }
 830
 831
 832 static void
 833 aaline_bind_sampler_states(struct pipe_context *pipe,
 834                            unsigned num, void **sampler)
 835 {
 836    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 837
 838    /* save current */
 839    memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 840    aaline->num_samplers = num;
 841
 842    /* pass-through */
 843    aaline->driver_bind_sampler_states(aaline->pipe, num, sampler);
 844 }
 845
 846
 847 static void
 848 aaline_set_sampler_textures(struct pipe_context *pipe,
 849                             unsigned num, struct pipe_texture **texture)
 850 {
 851    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 852    uint i;
 853
 854    /* save current */
 855    for (i = 0; i < num; i++) {
 856       pipe_texture_reference(&aaline->state.texture[i], texture[i]);
 857    }
 858    for ( ; i < PIPE_MAX_SAMPLERS; i++) {
 859       pipe_texture_reference(&aaline->state.texture[i], NULL);
 860    }
 861    aaline->num_textures = num;
 862
 863    /* pass-through */
 864    aaline->driver_set_sampler_textures(aaline->pipe, num, texture);
 865 }
 866
 867
 868 /**
 869  * Called by drivers that want to install this AA line prim stage
 870  * into the draw module's pipeline.  This will not be used if the
 871  * hardware has native support for AA lines.
 872  */
 873 boolean
 874 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 875 {
 876    struct aaline_stage *aaline;
 877
 878    pipe->draw = (void *) draw;
 879
 880    /*
 881     * Create / install AA line drawing / prim stage
 882     */
 883    aaline = draw_aaline_stage( draw );
 884    if (!aaline)
 885       goto fail;
 886
 887    aaline->pipe = pipe;
 888
 889    /* create special texture, sampler state */
 890    if (!aaline_create_texture(aaline))
 891       goto fail;
 892
 893    if (!aaline_create_sampler(aaline))
 894       goto fail;
 895
 896    /* save original driver functions */
 897    aaline->driver_create_fs_state = pipe->create_fs_state;
 898    aaline->driver_bind_fs_state = pipe->bind_fs_state;
 899    aaline->driver_delete_fs_state = pipe->delete_fs_state;
 900
 901    aaline->driver_bind_sampler_states = pipe->bind_fragment_sampler_states;
 902    aaline->driver_set_sampler_textures = pipe->set_fragment_sampler_textures;
 903
 904    /* override the driver's functions */
 905    pipe->create_fs_state = aaline_create_fs_state;
 906    pipe->bind_fs_state = aaline_bind_fs_state;
 907    pipe->delete_fs_state = aaline_delete_fs_state;
 908
 909    pipe->bind_fragment_sampler_states = aaline_bind_sampler_states;
 910    pipe->set_fragment_sampler_textures = aaline_set_sampler_textures;
 911
 912    /* Install once everything is known to be OK:
 913     */
 914    draw->pipeline.aaline = &aaline->stage;
 915
 916    return TRUE;
 917
 918  fail:
 919    if (aaline)
 920       aaline->stage.destroy( &aaline->stage );
 921
 922    return FALSE;
 923 }