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