src/gallium/auxiliary/draw/draw_pipe_aaline.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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 VMWARE 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 53
  55
  56
  57 /**
  58  * Size for the alpha texture used for antialiasing
  59  */
  60 #define TEXTURE_SIZE_LOG2  5   /* 32 x 32 */
  61
  62 /**
  63  * Max texture level for the alpha texture used for antialiasing
  64  *
  65  * Don't use the 1x1 and 2x2 mipmap levels.
  66  */
  67 #define MAX_TEXTURE_LEVEL  (TEXTURE_SIZE_LOG2 - 2)
  68
  69
  70 /**
  71  * Subclass of pipe_shader_state to carry extra fragment shader info.
  72  */
  73 struct aaline_fragment_shader
  74 {
  75    struct pipe_shader_state state;
  76    void *driver_fs;
  77    void *aaline_fs;
  78    uint sampler_unit;
  79    int generic_attrib;  /**< texcoord/generic used for texture */
  80 };
  81
  82
  83 /**
  84  * Subclass of draw_stage
  85  */
  86 struct aaline_stage
  87 {
  88    struct draw_stage stage;
  89
  90    float half_line_width;
  91
  92    /** For AA lines, this is the vertex attrib slot for the new texcoords */
  93    uint tex_slot;
  94    /** position, not necessarily output zero */
  95    uint pos_slot;
  96
  97    void *sampler_cso;
  98    struct pipe_resource *texture;
  99    struct pipe_sampler_view *sampler_view;
 100    uint num_samplers;
 101    uint num_sampler_views;
 102
 103
 104    /*
 105     * Currently bound state
 106     */
 107    struct aaline_fragment_shader *fs;
 108    struct {
 109       void *sampler[PIPE_MAX_SAMPLERS];
 110       struct pipe_sampler_view *sampler_views[PIPE_MAX_SHADER_SAMPLER_VIEWS];
 111    } state;
 112
 113    /*
 114     * Driver interface/override functions
 115     */
 116    void * (*driver_create_fs_state)(struct pipe_context *,
 117                                     const struct pipe_shader_state *);
 118    void (*driver_bind_fs_state)(struct pipe_context *, void *);
 119    void (*driver_delete_fs_state)(struct pipe_context *, void *);
 120
 121    void (*driver_bind_sampler_states)(struct pipe_context *, unsigned, unsigned,
 122                                       unsigned, void **);
 123
 124    void (*driver_set_sampler_views)(struct pipe_context *, unsigned shader,
 125                                     unsigned start, unsigned count,
 126                                     struct pipe_sampler_view **);
 127 };
 128
 129
 130
 131 /**
 132  * Subclass of tgsi_transform_context, used for transforming the
 133  * user's fragment shader to add the special AA instructions.
 134  */
 135 struct aa_transform_context {
 136    struct tgsi_transform_context base;
 137    uint tempsUsed;  /**< bitmask */
 138    int colorOutput; /**< which output is the primary color */
 139    uint samplersUsed;  /**< bitfield of samplers used */
 140    bool hasSview;
 141    int freeSampler;  /** an available sampler for the pstipple */
 142    int maxInput, maxGeneric;  /**< max input index found */
 143    int colorTemp, texTemp;  /**< temp registers */
 144 };
 145
 146
 147 /**
 148  * TGSI declaration transform callback.
 149  * Look for a free sampler, a free input attrib, and two free temp regs.
 150  */
 151 static void
 152 aa_transform_decl(struct tgsi_transform_context *ctx,
 153                   struct tgsi_full_declaration *decl)
 154 {
 155    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 156
 157    if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
 158        decl->Semantic.Name == TGSI_SEMANTIC_COLOR &&
 159        decl->Semantic.Index == 0) {
 160       aactx->colorOutput = decl->Range.First;
 161    }
 162    else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
 163       uint i;
 164       for (i = decl->Range.First;
 165            i <= decl->Range.Last; i++) {
 166          aactx->samplersUsed |= 1 << i;
 167       }
 168    }
 169    else if (decl->Declaration.File == TGSI_FILE_SAMPLER_VIEW) {
 170       aactx->hasSview = true;
 171    }
 172    else if (decl->Declaration.File == TGSI_FILE_INPUT) {
 173       if ((int) decl->Range.Last > aactx->maxInput)
 174          aactx->maxInput = decl->Range.Last;
 175       if (decl->Semantic.Name == TGSI_SEMANTIC_GENERIC &&
 176            (int) decl->Semantic.Index > aactx->maxGeneric) {
 177          aactx->maxGeneric = decl->Semantic.Index;
 178       }
 179    }
 180    else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
 181       uint i;
 182       for (i = decl->Range.First;
 183            i <= decl->Range.Last; i++) {
 184          aactx->tempsUsed |= (1 << i);
 185       }
 186    }
 187
 188    ctx->emit_declaration(ctx, decl);
 189 }
 190
 191
 192 /**
 193  * Find the lowest zero bit in the given word, or -1 if bitfield is all ones.
 194  */
 195 static int
 196 free_bit(uint bitfield)
 197 {
 198    return ffs(~bitfield) - 1;
 199 }
 200
 201
 202 /**
 203  * TGSI transform prolog callback.
 204  */
 205 static void
 206 aa_transform_prolog(struct tgsi_transform_context *ctx)
 207 {
 208    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 209    uint i;
 210
 211    /* find free sampler */
 212    aactx->freeSampler = free_bit(aactx->samplersUsed);
 213    if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
 214       aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
 215
 216    /* find two free temp regs */
 217    for (i = 0; i < 32; i++) {
 218       if ((aactx->tempsUsed & (1 << i)) == 0) {
 219       /* found a free temp */
 220       if (aactx->colorTemp < 0)
 221          aactx->colorTemp  = i;
 222       else if (aactx->texTemp < 0)
 223          aactx->texTemp  = i;
 224       else
 225          break;
 226       }
 227    }
 228    assert(aactx->colorTemp >= 0);
 229    assert(aactx->texTemp >= 0);
 230
 231    /* declare new generic input/texcoord */
 232    tgsi_transform_input_decl(ctx, aactx->maxInput + 1,
 233                              TGSI_SEMANTIC_GENERIC, aactx->maxGeneric + 1,
 234                              TGSI_INTERPOLATE_LINEAR);
 235
 236    /* declare new sampler */
 237    tgsi_transform_sampler_decl(ctx, aactx->freeSampler);
 238
 239    /* if the src shader has SVIEW decl's for each SAMP decl, we
 240     * need to continue the trend and ensure there is a matching
 241     * SVIEW for the new SAMP we just created
 242     */
 243    if (aactx->hasSview) {
 244       tgsi_transform_sampler_view_decl(ctx,
 245                                        aactx->freeSampler,
 246                                        TGSI_TEXTURE_2D,
 247                                        TGSI_RETURN_TYPE_FLOAT);
 248    }
 249
 250    /* declare new temp regs */
 251    tgsi_transform_temp_decl(ctx, aactx->texTemp);
 252    tgsi_transform_temp_decl(ctx, aactx->colorTemp);
 253 }
 254
 255
 256 /**
 257  * TGSI transform epilog callback.
 258  */
 259 static void
 260 aa_transform_epilog(struct tgsi_transform_context *ctx)
 261 {
 262    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 263
 264    if (aactx->colorOutput != -1) {
 265       /* insert texture sampling code for antialiasing. */
 266
 267       /* TEX texTemp, input_coord, sampler, 2D */
 268       tgsi_transform_tex_inst(ctx,
 269                               TGSI_FILE_TEMPORARY, aactx->texTemp,
 270                               TGSI_FILE_INPUT, aactx->maxInput + 1,
 271                               TGSI_TEXTURE_2D, aactx->freeSampler);
 272
 273       /* MOV rgb */
 274       tgsi_transform_op1_inst(ctx, TGSI_OPCODE_MOV,
 275                               TGSI_FILE_OUTPUT, aactx->colorOutput,
 276                               TGSI_WRITEMASK_XYZ,
 277                               TGSI_FILE_TEMPORARY, aactx->colorTemp);
 278
 279       /* MUL alpha */
 280       tgsi_transform_op2_inst(ctx, TGSI_OPCODE_MUL,
 281                               TGSI_FILE_OUTPUT, aactx->colorOutput,
 282                               TGSI_WRITEMASK_W,
 283                               TGSI_FILE_TEMPORARY, aactx->colorTemp,
 284                               TGSI_FILE_TEMPORARY, aactx->texTemp);
 285    }
 286 }
 287
 288
 289 /**
 290  * TGSI instruction transform callback.
 291  * Replace writes to result.color w/ a temp reg.
 292  */
 293 static void
 294 aa_transform_inst(struct tgsi_transform_context *ctx,
 295                   struct tgsi_full_instruction *inst)
 296 {
 297    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 298    uint i;
 299
 300    /*
 301     * Look for writes to result.color and replace with colorTemp reg.
 302     */
 303    for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 304       struct tgsi_full_dst_register *dst = &inst->Dst[i];
 305       if (dst->Register.File == TGSI_FILE_OUTPUT &&
 306           dst->Register.Index == aactx->colorOutput) {
 307          dst->Register.File = TGSI_FILE_TEMPORARY;
 308          dst->Register.Index = aactx->colorTemp;
 309       }
 310    }
 311
 312    ctx->emit_instruction(ctx, inst);
 313 }
 314
 315
 316 /**
 317  * Generate the frag shader we'll use for drawing AA lines.
 318  * This will be the user's shader plus some texture/modulate instructions.
 319  */
 320 static boolean
 321 generate_aaline_fs(struct aaline_stage *aaline)
 322 {
 323    struct pipe_context *pipe = aaline->stage.draw->pipe;
 324    const struct pipe_shader_state *orig_fs = &aaline->fs->state;
 325    struct pipe_shader_state aaline_fs;
 326    struct aa_transform_context transform;
 327    const uint newLen = tgsi_num_tokens(orig_fs->tokens) + NUM_NEW_TOKENS;
 328
 329    aaline_fs = *orig_fs; /* copy to init */
 330    aaline_fs.tokens = tgsi_alloc_tokens(newLen);
 331    if (aaline_fs.tokens == NULL)
 332       return FALSE;
 333
 334    memset(&transform, 0, sizeof(transform));
 335    transform.colorOutput = -1;
 336    transform.maxInput = -1;
 337    transform.maxGeneric = -1;
 338    transform.colorTemp = -1;
 339    transform.texTemp = -1;
 340    transform.base.prolog = aa_transform_prolog;
 341    transform.base.epilog = aa_transform_epilog;
 342    transform.base.transform_instruction = aa_transform_inst;
 343    transform.base.transform_declaration = aa_transform_decl;
 344
 345    tgsi_transform_shader(orig_fs->tokens,
 346                          (struct tgsi_token *) aaline_fs.tokens,
 347                          newLen, &transform.base);
 348
 349 #if 0 /* DEBUG */
 350    debug_printf("draw_aaline, orig shader:\n");
 351    tgsi_dump(orig_fs->tokens, 0);
 352    debug_printf("draw_aaline, new shader:\n");
 353    tgsi_dump(aaline_fs.tokens, 0);
 354 #endif
 355
 356    aaline->fs->sampler_unit = transform.freeSampler;
 357
 358    aaline->fs->aaline_fs = aaline->driver_create_fs_state(pipe, &aaline_fs);
 359    if (aaline->fs->aaline_fs == NULL)
 360       goto fail;
 361
 362    aaline->fs->generic_attrib = transform.maxGeneric + 1;
 363    FREE((void *)aaline_fs.tokens);
 364    return TRUE;
 365
 366 fail:
 367    FREE((void *)aaline_fs.tokens);
 368    return FALSE;
 369 }
 370
 371
 372 /**
 373  * Create the texture map we'll use for antialiasing the lines.
 374  */
 375 static boolean
 376 aaline_create_texture(struct aaline_stage *aaline)
 377 {
 378    struct pipe_context *pipe = aaline->stage.draw->pipe;
 379    struct pipe_screen *screen = pipe->screen;
 380    struct pipe_resource texTemp;
 381    struct pipe_sampler_view viewTempl;
 382    uint level;
 383
 384    memset(&texTemp, 0, sizeof(texTemp));
 385    texTemp.target = PIPE_TEXTURE_2D;
 386    texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
 387    texTemp.last_level = MAX_TEXTURE_LEVEL;
 388    texTemp.width0 = 1 << TEXTURE_SIZE_LOG2;
 389    texTemp.height0 = 1 << TEXTURE_SIZE_LOG2;
 390    texTemp.depth0 = 1;
 391    texTemp.array_size = 1;
 392    texTemp.bind = PIPE_BIND_SAMPLER_VIEW;
 393
 394    aaline->texture = screen->resource_create(screen, &texTemp);
 395    if (!aaline->texture)
 396       return FALSE;
 397
 398    u_sampler_view_default_template(&viewTempl,
 399                                    aaline->texture,
 400                                    aaline->texture->format);
 401    aaline->sampler_view = pipe->create_sampler_view(pipe,
 402                                                     aaline->texture,
 403                                                     &viewTempl);
 404    if (!aaline->sampler_view) {
 405       return FALSE;
 406    }
 407
 408    /* Fill in mipmap images.
 409     * Basically each level is solid opaque, except for the outermost
 410     * texels which are zero.  Special case the 1x1 and 2x2 levels
 411     * (though, those levels shouldn't be used - see the max_lod setting).
 412     */
 413    for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
 414       struct pipe_transfer *transfer;
 415       struct pipe_box box;
 416       const uint size = u_minify(aaline->texture->width0, level);
 417       ubyte *data;
 418       uint i, j;
 419
 420       assert(aaline->texture->width0 == aaline->texture->height0);
 421
 422       u_box_origin_2d( size, size, &box );
 423
 424       /* This texture is new, no need to flush.
 425        */
 426       data = pipe->transfer_map(pipe,
 427                                 aaline->texture,
 428                                 level,
 429                                 PIPE_TRANSFER_WRITE,
 430                                 &box, &transfer);
 431
 432       if (!data)
 433          return FALSE;
 434
 435       for (i = 0; i < size; i++) {
 436          for (j = 0; j < size; j++) {
 437             ubyte d;
 438             if (size == 1) {
 439                d = 255;
 440             }
 441             else if (size == 2) {
 442                d = 200; /* tuneable */
 443             }
 444             else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
 445                d = 35;  /* edge texel */
 446             }
 447             else {
 448                d = 255;
 449             }
 450             data[i * transfer->stride + j] = d;
 451          }
 452       }
 453
 454       /* unmap */
 455       pipe->transfer_unmap(pipe, transfer);
 456    }
 457    return TRUE;
 458 }
 459
 460
 461 /**
 462  * Create the sampler CSO that'll be used for antialiasing.
 463  * By using a mipmapped texture, we don't have to generate a different
 464  * texture image for each line size.
 465  */
 466 static boolean
 467 aaline_create_sampler(struct aaline_stage *aaline)
 468 {
 469    struct pipe_sampler_state sampler;
 470    struct pipe_context *pipe = aaline->stage.draw->pipe;
 471
 472    memset(&sampler, 0, sizeof(sampler));
 473    sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 474    sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 475    sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 476    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
 477    sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
 478    sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
 479    sampler.normalized_coords = 1;
 480    sampler.min_lod = 0.0f;
 481    sampler.max_lod = MAX_TEXTURE_LEVEL;
 482
 483    aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 484    if (aaline->sampler_cso == NULL)
 485       return FALSE;
 486
 487    return TRUE;
 488 }
 489
 490
 491 /**
 492  * When we're about to draw our first AA line in a batch, this function is
 493  * called to tell the driver to bind our modified fragment shader.
 494  */
 495 static boolean
 496 bind_aaline_fragment_shader(struct aaline_stage *aaline)
 497 {
 498    struct draw_context *draw = aaline->stage.draw;
 499    struct pipe_context *pipe = draw->pipe;
 500
 501    if (!aaline->fs->aaline_fs &&
 502        !generate_aaline_fs(aaline))
 503       return FALSE;
 504
 505    draw->suspend_flushing = TRUE;
 506    aaline->driver_bind_fs_state(pipe, aaline->fs->aaline_fs);
 507    draw->suspend_flushing = FALSE;
 508
 509    return TRUE;
 510 }
 511
 512
 513
 514 static inline struct aaline_stage *
 515 aaline_stage( struct draw_stage *stage )
 516 {
 517    return (struct aaline_stage *) stage;
 518 }
 519
 520
 521 /**
 522  * Draw a wide line by drawing a quad, using geometry which will
 523  * fullfill GL's antialiased line requirements.
 524  */
 525 static void
 526 aaline_line(struct draw_stage *stage, struct prim_header *header)
 527 {
 528    const struct aaline_stage *aaline = aaline_stage(stage);
 529    const float half_width = aaline->half_line_width;
 530    struct prim_header tri;
 531    struct vertex_header *v[8];
 532    uint texPos = aaline->tex_slot;
 533    uint posPos = aaline->pos_slot;
 534    float *pos, *tex;
 535    float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
 536    float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
 537    double a = atan2(dy, dx);
 538    float c_a = (float) cos(a), s_a = (float) sin(a);
 539    uint i;
 540
 541    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 542    dx = 0.5F * half_width;
 543    dy = half_width;
 544
 545    /* allocate/dup new verts */
 546    for (i = 0; i < 8; i++) {
 547       v[i] = dup_vert(stage, header->v[i/4], i);
 548    }
 549
 550    /*
 551     * Quad strip for line from v0 to v1 (*=endpoints):
 552     *
 553     *  1   3                     5   7
 554     *  +---+---------------------+---+
 555     *  |                             |
 556     *  | *v0                     v1* |
 557     *  |                             |
 558     *  +---+---------------------+---+
 559     *  0   2                     4   6
 560     */
 561
 562    /* new verts */
 563    pos = v[0]->data[posPos];
 564    pos[0] += (-dx * c_a -  dy * s_a);
 565    pos[1] += (-dx * s_a +  dy * c_a);
 566
 567    pos = v[1]->data[posPos];
 568    pos[0] += (-dx * c_a - -dy * s_a);
 569    pos[1] += (-dx * s_a + -dy * c_a);
 570
 571    pos = v[2]->data[posPos];
 572    pos[0] += ( dx * c_a -  dy * s_a);
 573    pos[1] += ( dx * s_a +  dy * c_a);
 574
 575    pos = v[3]->data[posPos];
 576    pos[0] += ( dx * c_a - -dy * s_a);
 577    pos[1] += ( dx * s_a + -dy * c_a);
 578
 579    pos = v[4]->data[posPos];
 580    pos[0] += (-dx * c_a -  dy * s_a);
 581    pos[1] += (-dx * s_a +  dy * c_a);
 582
 583    pos = v[5]->data[posPos];
 584    pos[0] += (-dx * c_a - -dy * s_a);
 585    pos[1] += (-dx * s_a + -dy * c_a);
 586
 587    pos = v[6]->data[posPos];
 588    pos[0] += ( dx * c_a -  dy * s_a);
 589    pos[1] += ( dx * s_a +  dy * c_a);
 590
 591    pos = v[7]->data[posPos];
 592    pos[0] += ( dx * c_a - -dy * s_a);
 593    pos[1] += ( dx * s_a + -dy * c_a);
 594
 595    /* new texcoords */
 596    tex = v[0]->data[texPos];
 597    ASSIGN_4V(tex, 0, 0, 0, 1);
 598
 599    tex = v[1]->data[texPos];
 600    ASSIGN_4V(tex, 0, 1, 0, 1);
 601
 602    tex = v[2]->data[texPos];
 603    ASSIGN_4V(tex, .5, 0, 0, 1);
 604
 605    tex = v[3]->data[texPos];
 606    ASSIGN_4V(tex, .5, 1, 0, 1);
 607
 608    tex = v[4]->data[texPos];
 609    ASSIGN_4V(tex, .5, 0, 0, 1);
 610
 611    tex = v[5]->data[texPos];
 612    ASSIGN_4V(tex, .5, 1, 0, 1);
 613
 614    tex = v[6]->data[texPos];
 615    ASSIGN_4V(tex, 1, 0, 0, 1);
 616
 617    tex = v[7]->data[texPos];
 618    ASSIGN_4V(tex, 1, 1, 0, 1);
 619
 620    /* emit 6 tris for the quad strip */
 621    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 622    stage->next->tri( stage->next, &tri );
 623
 624    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 625    stage->next->tri( stage->next, &tri );
 626
 627    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 628    stage->next->tri( stage->next, &tri );
 629
 630    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 631    stage->next->tri( stage->next, &tri );
 632
 633    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 634    stage->next->tri( stage->next, &tri );
 635
 636    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 637    stage->next->tri( stage->next, &tri );
 638 }
 639
 640
 641 static void
 642 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 643 {
 644    auto struct aaline_stage *aaline = aaline_stage(stage);
 645    struct draw_context *draw = stage->draw;
 646    struct pipe_context *pipe = draw->pipe;
 647    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 648    uint num_samplers;
 649    uint num_sampler_views;
 650    void *r;
 651
 652    assert(draw->rasterizer->line_smooth);
 653
 654    if (draw->rasterizer->line_width <= 2.2)
 655       aaline->half_line_width = 1.1f;
 656    else
 657       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 658
 659    /*
 660     * Bind (generate) our fragprog, sampler and texture
 661     */
 662    if (!bind_aaline_fragment_shader(aaline)) {
 663       stage->line = draw_pipe_passthrough_line;
 664       stage->line(stage, header);
 665       return;
 666    }
 667
 668    draw_aaline_prepare_outputs(draw, draw->pipeline.aaline);
 669
 670    /* how many samplers? */
 671    /* we'll use sampler/texture[aaline->sampler_unit] for the alpha texture */
 672    num_samplers = MAX2(aaline->num_samplers, aaline->fs->sampler_unit + 1);
 673    num_sampler_views = MAX2(num_samplers, aaline->num_sampler_views);
 674
 675    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 676    pipe_sampler_view_reference(&aaline->state.sampler_views[aaline->fs->sampler_unit],
 677                                aaline->sampler_view);
 678
 679    draw->suspend_flushing = TRUE;
 680
 681    aaline->driver_bind_sampler_states(pipe, PIPE_SHADER_FRAGMENT, 0,
 682                                       num_samplers, aaline->state.sampler);
 683
 684    aaline->driver_set_sampler_views(pipe, PIPE_SHADER_FRAGMENT, 0,
 685                                     num_sampler_views, aaline->state.sampler_views);
 686
 687    /* Disable triangle culling, stippling, unfilled mode etc. */
 688    r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
 689    pipe->bind_rasterizer_state(pipe, r);
 690
 691    draw->suspend_flushing = FALSE;
 692
 693    /* now really draw first line */
 694    stage->line = aaline_line;
 695    stage->line(stage, header);
 696 }
 697
 698
 699 static void
 700 aaline_flush(struct draw_stage *stage, unsigned flags)
 701 {
 702    struct draw_context *draw = stage->draw;
 703    struct aaline_stage *aaline = aaline_stage(stage);
 704    struct pipe_context *pipe = draw->pipe;
 705
 706    stage->line = aaline_first_line;
 707    stage->next->flush( stage->next, flags );
 708
 709    /* restore original frag shader, texture, sampler state */
 710    draw->suspend_flushing = TRUE;
 711    aaline->driver_bind_fs_state(pipe, aaline->fs ? aaline->fs->driver_fs : NULL);
 712
 713    aaline->driver_bind_sampler_states(pipe, PIPE_SHADER_FRAGMENT, 0,
 714                                       aaline->num_samplers,
 715                                       aaline->state.sampler);
 716
 717    aaline->driver_set_sampler_views(pipe, PIPE_SHADER_FRAGMENT, 0,
 718                                     aaline->num_samplers,
 719                                     aaline->state.sampler_views);
 720
 721    /* restore original rasterizer state */
 722    if (draw->rast_handle) {
 723       pipe->bind_rasterizer_state(pipe, draw->rast_handle);
 724    }
 725
 726    draw->suspend_flushing = FALSE;
 727
 728    draw_remove_extra_vertex_attribs(draw);
 729 }
 730
 731
 732 static void
 733 aaline_reset_stipple_counter(struct draw_stage *stage)
 734 {
 735    stage->next->reset_stipple_counter( stage->next );
 736 }
 737
 738
 739 static void
 740 aaline_destroy(struct draw_stage *stage)
 741 {
 742    struct aaline_stage *aaline = aaline_stage(stage);
 743    struct pipe_context *pipe = stage->draw->pipe;
 744    uint i;
 745
 746    for (i = 0; i < PIPE_MAX_SHADER_SAMPLER_VIEWS; i++) {
 747       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 748    }
 749
 750    if (aaline->sampler_cso)
 751       pipe->delete_sampler_state(pipe, aaline->sampler_cso);
 752
 753    if (aaline->texture)
 754       pipe_resource_reference(&aaline->texture, NULL);
 755
 756    if (aaline->sampler_view) {
 757       pipe_sampler_view_reference(&aaline->sampler_view, NULL);
 758    }
 759
 760    draw_free_temp_verts( stage );
 761
 762    /* restore the old entry points */
 763    pipe->create_fs_state = aaline->driver_create_fs_state;
 764    pipe->bind_fs_state = aaline->driver_bind_fs_state;
 765    pipe->delete_fs_state = aaline->driver_delete_fs_state;
 766
 767    pipe->bind_sampler_states = aaline->driver_bind_sampler_states;
 768    pipe->set_sampler_views = aaline->driver_set_sampler_views;
 769
 770    FREE( stage );
 771 }
 772
 773
 774 static struct aaline_stage *
 775 draw_aaline_stage(struct draw_context *draw)
 776 {
 777    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 778    if (!aaline)
 779       return NULL;
 780
 781    aaline->stage.draw = draw;
 782    aaline->stage.name = "aaline";
 783    aaline->stage.next = NULL;
 784    aaline->stage.point = draw_pipe_passthrough_point;
 785    aaline->stage.line = aaline_first_line;
 786    aaline->stage.tri = draw_pipe_passthrough_tri;
 787    aaline->stage.flush = aaline_flush;
 788    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 789    aaline->stage.destroy = aaline_destroy;
 790
 791    if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
 792       goto fail;
 793
 794    return aaline;
 795
 796  fail:
 797    aaline->stage.destroy(&aaline->stage);
 798
 799    return NULL;
 800 }
 801
 802
 803 static struct aaline_stage *
 804 aaline_stage_from_pipe(struct pipe_context *pipe)
 805 {
 806    struct draw_context *draw = (struct draw_context *) pipe->draw;
 807
 808    if (draw) {
 809       return aaline_stage(draw->pipeline.aaline);
 810    } else {
 811       return NULL;
 812    }
 813 }
 814
 815
 816 /**
 817  * This function overrides the driver's create_fs_state() function and
 818  * will typically be called by the state tracker.
 819  */
 820 static void *
 821 aaline_create_fs_state(struct pipe_context *pipe,
 822                        const struct pipe_shader_state *fs)
 823 {
 824    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 825    struct aaline_fragment_shader *aafs = NULL;
 826
 827    if (!aaline)
 828       return NULL;
 829
 830    aafs = CALLOC_STRUCT(aaline_fragment_shader);
 831
 832    if (!aafs)
 833       return NULL;
 834
 835    aafs->state.tokens = tgsi_dup_tokens(fs->tokens);
 836
 837    /* pass-through */
 838    aafs->driver_fs = aaline->driver_create_fs_state(pipe, fs);
 839
 840    return aafs;
 841 }
 842
 843
 844 static void
 845 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 846 {
 847    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 848    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 849
 850    if (!aaline) {
 851       return;
 852    }
 853
 854    /* save current */
 855    aaline->fs = aafs;
 856    /* pass-through */
 857    aaline->driver_bind_fs_state(pipe, (aafs ? aafs->driver_fs : NULL));
 858 }
 859
 860
 861 static void
 862 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 863 {
 864    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 865    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 866
 867    if (!aafs) {
 868       return;
 869    }
 870
 871    if (aaline) {
 872       /* pass-through */
 873       aaline->driver_delete_fs_state(pipe, aafs->driver_fs);
 874
 875       if (aafs->aaline_fs)
 876          aaline->driver_delete_fs_state(pipe, aafs->aaline_fs);
 877    }
 878
 879    FREE((void*)aafs->state.tokens);
 880    FREE(aafs);
 881 }
 882
 883
 884 static void
 885 aaline_bind_sampler_states(struct pipe_context *pipe, unsigned shader,
 886                            unsigned start, unsigned num, void **sampler)
 887 {
 888    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 889
 890    assert(start == 0);
 891
 892    if (!aaline) {
 893       return;
 894    }
 895
 896    if (shader == PIPE_SHADER_FRAGMENT) {
 897       /* save current */
 898       memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 899       aaline->num_samplers = num;
 900    }
 901
 902    /* pass-through */
 903    aaline->driver_bind_sampler_states(pipe, shader, start, num, sampler);
 904 }
 905
 906
 907 static void
 908 aaline_set_sampler_views(struct pipe_context *pipe, unsigned shader,
 909                          unsigned start, unsigned num,
 910                          struct pipe_sampler_view **views)
 911 {
 912    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 913    uint i;
 914
 915    if (!aaline) {
 916       return;
 917    }
 918
 919    if (shader == PIPE_SHADER_FRAGMENT) {
 920       /* save current */
 921       for (i = 0; i < num; i++) {
 922          pipe_sampler_view_reference(&aaline->state.sampler_views[start + i],
 923                                      views[i]);
 924       }
 925       aaline->num_sampler_views = num;
 926    }
 927
 928    /* pass-through */
 929    aaline->driver_set_sampler_views(pipe, shader, start, num, views);
 930 }
 931
 932
 933 void
 934 draw_aaline_prepare_outputs(struct draw_context *draw,
 935                             struct draw_stage *stage)
 936 {
 937    struct aaline_stage *aaline = aaline_stage(stage);
 938    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 939
 940    /* update vertex attrib info */
 941    aaline->pos_slot = draw_current_shader_position_output(draw);
 942
 943    if (!rast->line_smooth)
 944       return;
 945
 946    /* allocate the extra post-transformed vertex attribute */
 947    aaline->tex_slot = draw_alloc_extra_vertex_attrib(draw,
 948                                                      TGSI_SEMANTIC_GENERIC,
 949                                                      aaline->fs->generic_attrib);
 950 }
 951
 952 /**
 953  * Called by drivers that want to install this AA line prim stage
 954  * into the draw module's pipeline.  This will not be used if the
 955  * hardware has native support for AA lines.
 956  */
 957 boolean
 958 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 959 {
 960    struct aaline_stage *aaline;
 961
 962    pipe->draw = (void *) draw;
 963
 964    /*
 965     * Create / install AA line drawing / prim stage
 966     */
 967    aaline = draw_aaline_stage( draw );
 968    if (!aaline)
 969       goto fail;
 970
 971    /* save original driver functions */
 972    aaline->driver_create_fs_state = pipe->create_fs_state;
 973    aaline->driver_bind_fs_state = pipe->bind_fs_state;
 974    aaline->driver_delete_fs_state = pipe->delete_fs_state;
 975
 976    aaline->driver_bind_sampler_states = pipe->bind_sampler_states;
 977    aaline->driver_set_sampler_views = pipe->set_sampler_views;
 978
 979    /* create special texture, sampler state */
 980    if (!aaline_create_texture(aaline))
 981       goto fail;
 982
 983    if (!aaline_create_sampler(aaline))
 984       goto fail;
 985
 986    /* override the driver's functions */
 987    pipe->create_fs_state = aaline_create_fs_state;
 988    pipe->bind_fs_state = aaline_bind_fs_state;
 989    pipe->delete_fs_state = aaline_delete_fs_state;
 990
 991    pipe->bind_sampler_states = aaline_bind_sampler_states;
 992    pipe->set_sampler_views = aaline_set_sampler_views;
 993
 994    /* Install once everything is known to be OK:
 995     */
 996    draw->pipeline.aaline = &aaline->stage;
 997
 998    return TRUE;
 999
1000  fail:
1001    if (aaline)
1002       aaline->stage.destroy( &aaline->stage );
1003
1004    return FALSE;
1005 }