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_texture *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_texture 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
 411    aaline->texture = screen->texture_create(screen, &texTemp);
 412    if (!aaline->texture)
 413       return FALSE;
 414
 415    u_sampler_view_default_template(&viewTempl,
 416                                    aaline->texture,
 417                                    aaline->texture->format);
 418    aaline->sampler_view = pipe->create_sampler_view(pipe,
 419                                                     aaline->texture,
 420                                                     &viewTempl);
 421    if (!aaline->sampler_view) {
 422       return FALSE;
 423    }
 424
 425    /* Fill in mipmap images.
 426     * Basically each level is solid opaque, except for the outermost
 427     * texels which are zero.  Special case the 1x1 and 2x2 levels.
 428     */
 429    for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
 430       struct pipe_transfer *transfer;
 431       const uint size = u_minify(aaline->texture->width0, level);
 432       ubyte *data;
 433       uint i, j;
 434
 435       assert(aaline->texture->width0 == aaline->texture->height0);
 436
 437       /* This texture is new, no need to flush.
 438        */
 439       transfer = pipe->get_tex_transfer(pipe, aaline->texture, 0, level, 0,
 440                                          PIPE_TRANSFER_WRITE, 0, 0, size, size);
 441       data = pipe->transfer_map(pipe, transfer);
 442       if (data == NULL)
 443          return FALSE;
 444
 445       for (i = 0; i < size; i++) {
 446          for (j = 0; j < size; j++) {
 447             ubyte d;
 448             if (size == 1) {
 449                d = 255;
 450             }
 451             else if (size == 2) {
 452                d = 200; /* tuneable */
 453             }
 454             else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
 455                d = 0;
 456             }
 457             else {
 458                d = 255;
 459             }
 460             data[i * transfer->stride + j] = d;
 461          }
 462       }
 463
 464       /* unmap */
 465       pipe->transfer_unmap(pipe, transfer);
 466       pipe->tex_transfer_destroy(pipe, transfer);
 467    }
 468    return TRUE;
 469 }
 470
 471
 472 /**
 473  * Create the sampler CSO that'll be used for antialiasing.
 474  * By using a mipmapped texture, we don't have to generate a different
 475  * texture image for each line size.
 476  */
 477 static boolean
 478 aaline_create_sampler(struct aaline_stage *aaline)
 479 {
 480    struct pipe_sampler_state sampler;
 481    struct pipe_context *pipe = aaline->pipe;
 482
 483    memset(&sampler, 0, sizeof(sampler));
 484    sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 485    sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 486    sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 487    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
 488    sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
 489    sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
 490    sampler.normalized_coords = 1;
 491    sampler.min_lod = 0.0f;
 492    sampler.max_lod = MAX_TEXTURE_LEVEL;
 493
 494    aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 495    if (aaline->sampler_cso == NULL)
 496       return FALSE;
 497
 498    return TRUE;
 499 }
 500
 501
 502 /**
 503  * When we're about to draw our first AA line in a batch, this function is
 504  * called to tell the driver to bind our modified fragment shader.
 505  */
 506 static boolean
 507 bind_aaline_fragment_shader(struct aaline_stage *aaline)
 508 {
 509    struct draw_context *draw = aaline->stage.draw;
 510
 511    if (!aaline->fs->aaline_fs &&
 512        !generate_aaline_fs(aaline))
 513       return FALSE;
 514
 515    draw->suspend_flushing = TRUE;
 516    aaline->driver_bind_fs_state(aaline->pipe, aaline->fs->aaline_fs);
 517    draw->suspend_flushing = FALSE;
 518
 519    return TRUE;
 520 }
 521
 522
 523
 524 static INLINE struct aaline_stage *
 525 aaline_stage( struct draw_stage *stage )
 526 {
 527    return (struct aaline_stage *) stage;
 528 }
 529
 530
 531 /**
 532  * Draw a wide line by drawing a quad, using geometry which will
 533  * fullfill GL's antialiased line requirements.
 534  */
 535 static void
 536 aaline_line(struct draw_stage *stage, struct prim_header *header)
 537 {
 538    const struct aaline_stage *aaline = aaline_stage(stage);
 539    const float half_width = aaline->half_line_width;
 540    struct prim_header tri;
 541    struct vertex_header *v[8];
 542    uint texPos = aaline->tex_slot;
 543    uint posPos = aaline->pos_slot;
 544    float *pos, *tex;
 545    float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
 546    float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
 547    double a = atan2(dy, dx);
 548    float c_a = (float) cos(a), s_a = (float) sin(a);
 549    uint i;
 550
 551    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 552    dx = 0.5F * half_width;
 553    dy = half_width;
 554
 555    /* allocate/dup new verts */
 556    for (i = 0; i < 8; i++) {
 557       v[i] = dup_vert(stage, header->v[i/4], i);
 558    }
 559
 560    /*
 561     * Quad strip for line from v0 to v1 (*=endpoints):
 562     *
 563     *  1   3                     5   7
 564     *  +---+---------------------+---+
 565     *  |                             |
 566     *  | *v0                     v1* |
 567     *  |                             |
 568     *  +---+---------------------+---+
 569     *  0   2                     4   6
 570     */
 571
 572    /* new verts */
 573    pos = v[0]->data[posPos];
 574    pos[0] += (-dx * c_a -  dy * s_a);
 575    pos[1] += (-dx * s_a +  dy * c_a);
 576
 577    pos = v[1]->data[posPos];
 578    pos[0] += (-dx * c_a - -dy * s_a);
 579    pos[1] += (-dx * s_a + -dy * c_a);
 580
 581    pos = v[2]->data[posPos];
 582    pos[0] += ( dx * c_a -  dy * s_a);
 583    pos[1] += ( dx * s_a +  dy * c_a);
 584
 585    pos = v[3]->data[posPos];
 586    pos[0] += ( dx * c_a - -dy * s_a);
 587    pos[1] += ( dx * s_a + -dy * c_a);
 588
 589    pos = v[4]->data[posPos];
 590    pos[0] += (-dx * c_a -  dy * s_a);
 591    pos[1] += (-dx * s_a +  dy * c_a);
 592
 593    pos = v[5]->data[posPos];
 594    pos[0] += (-dx * c_a - -dy * s_a);
 595    pos[1] += (-dx * s_a + -dy * c_a);
 596
 597    pos = v[6]->data[posPos];
 598    pos[0] += ( dx * c_a -  dy * s_a);
 599    pos[1] += ( dx * s_a +  dy * c_a);
 600
 601    pos = v[7]->data[posPos];
 602    pos[0] += ( dx * c_a - -dy * s_a);
 603    pos[1] += ( dx * s_a + -dy * c_a);
 604
 605    /* new texcoords */
 606    tex = v[0]->data[texPos];
 607    ASSIGN_4V(tex, 0, 0, 0, 1);
 608
 609    tex = v[1]->data[texPos];
 610    ASSIGN_4V(tex, 0, 1, 0, 1);
 611
 612    tex = v[2]->data[texPos];
 613    ASSIGN_4V(tex, .5, 0, 0, 1);
 614
 615    tex = v[3]->data[texPos];
 616    ASSIGN_4V(tex, .5, 1, 0, 1);
 617
 618    tex = v[4]->data[texPos];
 619    ASSIGN_4V(tex, .5, 0, 0, 1);
 620
 621    tex = v[5]->data[texPos];
 622    ASSIGN_4V(tex, .5, 1, 0, 1);
 623
 624    tex = v[6]->data[texPos];
 625    ASSIGN_4V(tex, 1, 0, 0, 1);
 626
 627    tex = v[7]->data[texPos];
 628    ASSIGN_4V(tex, 1, 1, 0, 1);
 629
 630    /* emit 6 tris for the quad strip */
 631    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 632    stage->next->tri( stage->next, &tri );
 633
 634    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 635    stage->next->tri( stage->next, &tri );
 636
 637    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 638    stage->next->tri( stage->next, &tri );
 639
 640    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 641    stage->next->tri( stage->next, &tri );
 642
 643    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 644    stage->next->tri( stage->next, &tri );
 645
 646    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 647    stage->next->tri( stage->next, &tri );
 648 }
 649
 650
 651 static void
 652 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 653 {
 654    auto struct aaline_stage *aaline = aaline_stage(stage);
 655    struct draw_context *draw = stage->draw;
 656    struct pipe_context *pipe = aaline->pipe;
 657    uint num_samplers;
 658
 659    assert(draw->rasterizer->line_smooth);
 660
 661    if (draw->rasterizer->line_width <= 3.0)
 662       aaline->half_line_width = 1.5f;
 663    else
 664       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 665
 666    /*
 667     * Bind (generate) our fragprog, sampler and texture
 668     */
 669    if (!bind_aaline_fragment_shader(aaline)) {
 670       stage->line = draw_pipe_passthrough_line;
 671       stage->line(stage, header);
 672       return;
 673    }
 674
 675    /* update vertex attrib info */
 676    aaline->tex_slot = draw_current_shader_outputs(draw);
 677    aaline->pos_slot = draw_current_shader_position_output(draw);;
 678
 679    /* advertise the extra post-transformed vertex attribute */
 680    draw->extra_shader_outputs.semantic_name = TGSI_SEMANTIC_GENERIC;
 681    draw->extra_shader_outputs.semantic_index = aaline->fs->generic_attrib;
 682    draw->extra_shader_outputs.slot = aaline->tex_slot;
 683
 684    /* how many samplers? */
 685    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 686    num_samplers = MAX2(aaline->num_sampler_views, aaline->num_samplers);
 687    num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
 688
 689    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 690    pipe_sampler_view_reference(&aaline->state.sampler_views[aaline->fs->sampler_unit],
 691                                aaline->sampler_view);
 692
 693    draw->suspend_flushing = TRUE;
 694    aaline->driver_bind_sampler_states(pipe, num_samplers, aaline->state.sampler);
 695    aaline->driver_set_sampler_views(pipe, num_samplers, aaline->state.sampler_views);
 696    draw->suspend_flushing = FALSE;
 697
 698    /* now really draw first line */
 699    stage->line = aaline_line;
 700    stage->line(stage, header);
 701 }
 702
 703
 704 static void
 705 aaline_flush(struct draw_stage *stage, unsigned flags)
 706 {
 707    struct draw_context *draw = stage->draw;
 708    struct aaline_stage *aaline = aaline_stage(stage);
 709    struct pipe_context *pipe = aaline->pipe;
 710
 711    stage->line = aaline_first_line;
 712    stage->next->flush( stage->next, flags );
 713
 714    /* restore original frag shader, texture, sampler state */
 715    draw->suspend_flushing = TRUE;
 716    aaline->driver_bind_fs_state(pipe, aaline->fs->driver_fs);
 717    aaline->driver_bind_sampler_states(pipe, aaline->num_samplers,
 718                                       aaline->state.sampler);
 719    aaline->driver_set_sampler_views(pipe,
 720                                     aaline->num_sampler_views,
 721                                     aaline->state.sampler_views);
 722    draw->suspend_flushing = FALSE;
 723
 724    draw->extra_shader_outputs.slot = 0;
 725 }
 726
 727
 728 static void
 729 aaline_reset_stipple_counter(struct draw_stage *stage)
 730 {
 731    stage->next->reset_stipple_counter( stage->next );
 732 }
 733
 734
 735 static void
 736 aaline_destroy(struct draw_stage *stage)
 737 {
 738    struct aaline_stage *aaline = aaline_stage(stage);
 739    uint i;
 740
 741    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 742       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 743    }
 744
 745    if (aaline->sampler_cso)
 746       aaline->pipe->delete_sampler_state(aaline->pipe, aaline->sampler_cso);
 747
 748    if (aaline->texture)
 749       pipe_texture_reference(&aaline->texture, NULL);
 750
 751    if (aaline->sampler_view) {
 752       pipe_sampler_view_reference(&aaline->sampler_view, NULL);
 753    }
 754
 755    draw_free_temp_verts( stage );
 756
 757    FREE( stage );
 758 }
 759
 760
 761 static struct aaline_stage *
 762 draw_aaline_stage(struct draw_context *draw)
 763 {
 764    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 765    if (aaline == NULL)
 766       return NULL;
 767
 768    if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
 769       goto fail;
 770
 771    aaline->stage.draw = draw;
 772    aaline->stage.name = "aaline";
 773    aaline->stage.next = NULL;
 774    aaline->stage.point = draw_pipe_passthrough_point;
 775    aaline->stage.line = aaline_first_line;
 776    aaline->stage.tri = draw_pipe_passthrough_tri;
 777    aaline->stage.flush = aaline_flush;
 778    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 779    aaline->stage.destroy = aaline_destroy;
 780
 781    return aaline;
 782
 783  fail:
 784    if (aaline)
 785       aaline_destroy(&aaline->stage);
 786
 787    return NULL;
 788 }
 789
 790
 791 static struct aaline_stage *
 792 aaline_stage_from_pipe(struct pipe_context *pipe)
 793 {
 794    struct draw_context *draw = (struct draw_context *) pipe->draw;
 795    return aaline_stage(draw->pipeline.aaline);
 796 }
 797
 798
 799 /**
 800  * This function overrides the driver's create_fs_state() function and
 801  * will typically be called by the state tracker.
 802  */
 803 static void *
 804 aaline_create_fs_state(struct pipe_context *pipe,
 805                        const struct pipe_shader_state *fs)
 806 {
 807    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 808    struct aaline_fragment_shader *aafs = CALLOC_STRUCT(aaline_fragment_shader);
 809    if (aafs == NULL)
 810       return NULL;
 811
 812    aafs->state = *fs;
 813
 814    /* pass-through */
 815    aafs->driver_fs = aaline->driver_create_fs_state(aaline->pipe, fs);
 816
 817    return aafs;
 818 }
 819
 820
 821 static void
 822 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 823 {
 824    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 825    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 826
 827    /* save current */
 828    aaline->fs = aafs;
 829    /* pass-through */
 830    aaline->driver_bind_fs_state(aaline->pipe,
 831                                 (aafs ? aafs->driver_fs : NULL));
 832 }
 833
 834
 835 static void
 836 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 837 {
 838    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 839    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 840    /* pass-through */
 841    aaline->driver_delete_fs_state(aaline->pipe, aafs->driver_fs);
 842
 843    if (aafs->aaline_fs)
 844       aaline->driver_delete_fs_state(aaline->pipe, aafs->aaline_fs);
 845
 846    FREE(aafs);
 847 }
 848
 849
 850 static void
 851 aaline_bind_sampler_states(struct pipe_context *pipe,
 852                            unsigned num, void **sampler)
 853 {
 854    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 855
 856    /* save current */
 857    memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 858    aaline->num_samplers = num;
 859
 860    /* pass-through */
 861    aaline->driver_bind_sampler_states(aaline->pipe, num, sampler);
 862 }
 863
 864
 865 static void
 866 aaline_set_sampler_views(struct pipe_context *pipe,
 867                          unsigned num,
 868                          struct pipe_sampler_view **views)
 869 {
 870    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 871    uint i;
 872
 873    /* save current */
 874    for (i = 0; i < num; i++) {
 875       pipe_sampler_view_reference(&aaline->state.sampler_views[i], views[i]);
 876    }
 877    for ( ; i < PIPE_MAX_SAMPLERS; i++) {
 878       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 879    }
 880    aaline->num_sampler_views = num;
 881
 882    /* pass-through */
 883    aaline->driver_set_sampler_views(aaline->pipe, num, views);
 884 }
 885
 886
 887 /**
 888  * Called by drivers that want to install this AA line prim stage
 889  * into the draw module's pipeline.  This will not be used if the
 890  * hardware has native support for AA lines.
 891  */
 892 boolean
 893 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 894 {
 895    struct aaline_stage *aaline;
 896
 897    pipe->draw = (void *) draw;
 898
 899    /*
 900     * Create / install AA line drawing / prim stage
 901     */
 902    aaline = draw_aaline_stage( draw );
 903    if (!aaline)
 904       goto fail;
 905
 906    aaline->pipe = pipe;
 907
 908    /* create special texture, sampler state */
 909    if (!aaline_create_texture(aaline))
 910       goto fail;
 911
 912    if (!aaline_create_sampler(aaline))
 913       goto fail;
 914
 915    /* save original driver functions */
 916    aaline->driver_create_fs_state = pipe->create_fs_state;
 917    aaline->driver_bind_fs_state = pipe->bind_fs_state;
 918    aaline->driver_delete_fs_state = pipe->delete_fs_state;
 919
 920    aaline->driver_bind_sampler_states = pipe->bind_fragment_sampler_states;
 921    aaline->driver_set_sampler_views = pipe->set_fragment_sampler_views;
 922
 923    /* override the driver's functions */
 924    pipe->create_fs_state = aaline_create_fs_state;
 925    pipe->bind_fs_state = aaline_bind_fs_state;
 926    pipe->delete_fs_state = aaline_delete_fs_state;
 927
 928    pipe->bind_fragment_sampler_states = aaline_bind_sampler_states;
 929    pipe->set_fragment_sampler_views = aaline_set_sampler_views;
 930
 931    /* Install once everything is known to be OK:
 932     */
 933    draw->pipeline.aaline = &aaline->stage;
 934
 935    return TRUE;
 936
 937  fail:
 938    if (aaline)
 939       aaline->stage.destroy( &aaline->stage );
 940
 941    return FALSE;
 942 }