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 |= 1u << 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    STATIC_ASSERT(sizeof(aactx->samplersUsed) * 8 >= PIPE_MAX_SAMPLERS);
 212
 213    /* find free sampler */
 214    aactx->freeSampler = free_bit(aactx->samplersUsed);
 215    if (aactx->freeSampler < 0 || aactx->freeSampler >= PIPE_MAX_SAMPLERS)
 216       aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
 217
 218    /* find two free temp regs */
 219    for (i = 0; i < 32; i++) {
 220       if ((aactx->tempsUsed & (1 << i)) == 0) {
 221       /* found a free temp */
 222       if (aactx->colorTemp < 0)
 223          aactx->colorTemp  = i;
 224       else if (aactx->texTemp < 0)
 225          aactx->texTemp  = i;
 226       else
 227          break;
 228       }
 229    }
 230    assert(aactx->colorTemp >= 0);
 231    assert(aactx->texTemp >= 0);
 232
 233    /* declare new generic input/texcoord */
 234    tgsi_transform_input_decl(ctx, aactx->maxInput + 1,
 235                              TGSI_SEMANTIC_GENERIC, aactx->maxGeneric + 1,
 236                              TGSI_INTERPOLATE_LINEAR);
 237
 238    /* declare new sampler */
 239    tgsi_transform_sampler_decl(ctx, aactx->freeSampler);
 240
 241    /* if the src shader has SVIEW decl's for each SAMP decl, we
 242     * need to continue the trend and ensure there is a matching
 243     * SVIEW for the new SAMP we just created
 244     */
 245    if (aactx->hasSview) {
 246       tgsi_transform_sampler_view_decl(ctx,
 247                                        aactx->freeSampler,
 248                                        TGSI_TEXTURE_2D,
 249                                        TGSI_RETURN_TYPE_FLOAT);
 250    }
 251
 252    /* declare new temp regs */
 253    tgsi_transform_temp_decl(ctx, aactx->texTemp);
 254    tgsi_transform_temp_decl(ctx, aactx->colorTemp);
 255 }
 256
 257
 258 /**
 259  * TGSI transform epilog callback.
 260  */
 261 static void
 262 aa_transform_epilog(struct tgsi_transform_context *ctx)
 263 {
 264    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 265
 266    if (aactx->colorOutput != -1) {
 267       /* insert texture sampling code for antialiasing. */
 268
 269       /* TEX texTemp, input_coord, sampler, 2D */
 270       tgsi_transform_tex_inst(ctx,
 271                               TGSI_FILE_TEMPORARY, aactx->texTemp,
 272                               TGSI_FILE_INPUT, aactx->maxInput + 1,
 273                               TGSI_TEXTURE_2D, aactx->freeSampler);
 274
 275       /* MOV rgb */
 276       tgsi_transform_op1_inst(ctx, TGSI_OPCODE_MOV,
 277                               TGSI_FILE_OUTPUT, aactx->colorOutput,
 278                               TGSI_WRITEMASK_XYZ,
 279                               TGSI_FILE_TEMPORARY, aactx->colorTemp);
 280
 281       /* MUL alpha */
 282       tgsi_transform_op2_inst(ctx, TGSI_OPCODE_MUL,
 283                               TGSI_FILE_OUTPUT, aactx->colorOutput,
 284                               TGSI_WRITEMASK_W,
 285                               TGSI_FILE_TEMPORARY, aactx->colorTemp,
 286                               TGSI_FILE_TEMPORARY, aactx->texTemp);
 287    }
 288 }
 289
 290
 291 /**
 292  * TGSI instruction transform callback.
 293  * Replace writes to result.color w/ a temp reg.
 294  */
 295 static void
 296 aa_transform_inst(struct tgsi_transform_context *ctx,
 297                   struct tgsi_full_instruction *inst)
 298 {
 299    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 300    uint i;
 301
 302    /*
 303     * Look for writes to result.color and replace with colorTemp reg.
 304     */
 305    for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 306       struct tgsi_full_dst_register *dst = &inst->Dst[i];
 307       if (dst->Register.File == TGSI_FILE_OUTPUT &&
 308           dst->Register.Index == aactx->colorOutput) {
 309          dst->Register.File = TGSI_FILE_TEMPORARY;
 310          dst->Register.Index = aactx->colorTemp;
 311       }
 312    }
 313
 314    ctx->emit_instruction(ctx, inst);
 315 }
 316
 317
 318 /**
 319  * Generate the frag shader we'll use for drawing AA lines.
 320  * This will be the user's shader plus some texture/modulate instructions.
 321  */
 322 static boolean
 323 generate_aaline_fs(struct aaline_stage *aaline)
 324 {
 325    struct pipe_context *pipe = aaline->stage.draw->pipe;
 326    const struct pipe_shader_state *orig_fs = &aaline->fs->state;
 327    struct pipe_shader_state aaline_fs;
 328    struct aa_transform_context transform;
 329    const uint newLen = tgsi_num_tokens(orig_fs->tokens) + NUM_NEW_TOKENS;
 330
 331    aaline_fs = *orig_fs; /* copy to init */
 332    aaline_fs.tokens = tgsi_alloc_tokens(newLen);
 333    if (aaline_fs.tokens == NULL)
 334       return FALSE;
 335
 336    memset(&transform, 0, sizeof(transform));
 337    transform.colorOutput = -1;
 338    transform.maxInput = -1;
 339    transform.maxGeneric = -1;
 340    transform.colorTemp = -1;
 341    transform.texTemp = -1;
 342    transform.base.prolog = aa_transform_prolog;
 343    transform.base.epilog = aa_transform_epilog;
 344    transform.base.transform_instruction = aa_transform_inst;
 345    transform.base.transform_declaration = aa_transform_decl;
 346
 347    tgsi_transform_shader(orig_fs->tokens,
 348                          (struct tgsi_token *) aaline_fs.tokens,
 349                          newLen, &transform.base);
 350
 351 #if 0 /* DEBUG */
 352    debug_printf("draw_aaline, orig shader:\n");
 353    tgsi_dump(orig_fs->tokens, 0);
 354    debug_printf("draw_aaline, new shader:\n");
 355    tgsi_dump(aaline_fs.tokens, 0);
 356 #endif
 357
 358    aaline->fs->sampler_unit = transform.freeSampler;
 359
 360    aaline->fs->aaline_fs = aaline->driver_create_fs_state(pipe, &aaline_fs);
 361    if (aaline->fs->aaline_fs == NULL)
 362       goto fail;
 363
 364    aaline->fs->generic_attrib = transform.maxGeneric + 1;
 365    FREE((void *)aaline_fs.tokens);
 366    return TRUE;
 367
 368 fail:
 369    FREE((void *)aaline_fs.tokens);
 370    return FALSE;
 371 }
 372
 373
 374 /**
 375  * Create the texture map we'll use for antialiasing the lines.
 376  */
 377 static boolean
 378 aaline_create_texture(struct aaline_stage *aaline)
 379 {
 380    struct pipe_context *pipe = aaline->stage.draw->pipe;
 381    struct pipe_screen *screen = pipe->screen;
 382    struct pipe_resource texTemp;
 383    struct pipe_sampler_view viewTempl;
 384    uint level;
 385
 386    memset(&texTemp, 0, sizeof(texTemp));
 387    texTemp.target = PIPE_TEXTURE_2D;
 388    texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
 389    texTemp.last_level = MAX_TEXTURE_LEVEL;
 390    texTemp.width0 = 1 << TEXTURE_SIZE_LOG2;
 391    texTemp.height0 = 1 << TEXTURE_SIZE_LOG2;
 392    texTemp.depth0 = 1;
 393    texTemp.array_size = 1;
 394    texTemp.bind = PIPE_BIND_SAMPLER_VIEW;
 395
 396    aaline->texture = screen->resource_create(screen, &texTemp);
 397    if (!aaline->texture)
 398       return FALSE;
 399
 400    u_sampler_view_default_template(&viewTempl,
 401                                    aaline->texture,
 402                                    aaline->texture->format);
 403    aaline->sampler_view = pipe->create_sampler_view(pipe,
 404                                                     aaline->texture,
 405                                                     &viewTempl);
 406    if (!aaline->sampler_view) {
 407       return FALSE;
 408    }
 409
 410    /* Fill in mipmap images.
 411     * Basically each level is solid opaque, except for the outermost
 412     * texels which are zero.  Special case the 1x1 and 2x2 levels
 413     * (though, those levels shouldn't be used - see the max_lod setting).
 414     */
 415    for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
 416       struct pipe_transfer *transfer;
 417       struct pipe_box box;
 418       const uint size = u_minify(aaline->texture->width0, level);
 419       ubyte *data;
 420       uint i, j;
 421
 422       assert(aaline->texture->width0 == aaline->texture->height0);
 423
 424       u_box_origin_2d( size, size, &box );
 425
 426       /* This texture is new, no need to flush.
 427        */
 428       data = pipe->transfer_map(pipe,
 429                                 aaline->texture,
 430                                 level,
 431                                 PIPE_TRANSFER_WRITE,
 432                                 &box, &transfer);
 433
 434       if (!data)
 435          return FALSE;
 436
 437       for (i = 0; i < size; i++) {
 438          for (j = 0; j < size; j++) {
 439             ubyte d;
 440             if (size == 1) {
 441                d = 255;
 442             }
 443             else if (size == 2) {
 444                d = 200; /* tuneable */
 445             }
 446             else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
 447                d = 35;  /* edge texel */
 448             }
 449             else {
 450                d = 255;
 451             }
 452             data[i * transfer->stride + j] = d;
 453          }
 454       }
 455
 456       /* unmap */
 457       pipe->transfer_unmap(pipe, transfer);
 458    }
 459    return TRUE;
 460 }
 461
 462
 463 /**
 464  * Create the sampler CSO that'll be used for antialiasing.
 465  * By using a mipmapped texture, we don't have to generate a different
 466  * texture image for each line size.
 467  */
 468 static boolean
 469 aaline_create_sampler(struct aaline_stage *aaline)
 470 {
 471    struct pipe_sampler_state sampler;
 472    struct pipe_context *pipe = aaline->stage.draw->pipe;
 473
 474    memset(&sampler, 0, sizeof(sampler));
 475    sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 476    sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 477    sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 478    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
 479    sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
 480    sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
 481    sampler.normalized_coords = 1;
 482    sampler.min_lod = 0.0f;
 483    sampler.max_lod = MAX_TEXTURE_LEVEL;
 484
 485    aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 486    if (aaline->sampler_cso == NULL)
 487       return FALSE;
 488
 489    return TRUE;
 490 }
 491
 492
 493 /**
 494  * When we're about to draw our first AA line in a batch, this function is
 495  * called to tell the driver to bind our modified fragment shader.
 496  */
 497 static boolean
 498 bind_aaline_fragment_shader(struct aaline_stage *aaline)
 499 {
 500    struct draw_context *draw = aaline->stage.draw;
 501    struct pipe_context *pipe = draw->pipe;
 502
 503    if (!aaline->fs->aaline_fs &&
 504        !generate_aaline_fs(aaline))
 505       return FALSE;
 506
 507    draw->suspend_flushing = TRUE;
 508    aaline->driver_bind_fs_state(pipe, aaline->fs->aaline_fs);
 509    draw->suspend_flushing = FALSE;
 510
 511    return TRUE;
 512 }
 513
 514
 515
 516 static inline struct aaline_stage *
 517 aaline_stage( struct draw_stage *stage )
 518 {
 519    return (struct aaline_stage *) stage;
 520 }
 521
 522
 523 /**
 524  * Draw a wide line by drawing a quad, using geometry which will
 525  * fullfill GL's antialiased line requirements.
 526  */
 527 static void
 528 aaline_line(struct draw_stage *stage, struct prim_header *header)
 529 {
 530    const struct aaline_stage *aaline = aaline_stage(stage);
 531    const float half_width = aaline->half_line_width;
 532    struct prim_header tri;
 533    struct vertex_header *v[8];
 534    uint texPos = aaline->tex_slot;
 535    uint posPos = aaline->pos_slot;
 536    float *pos, *tex;
 537    float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
 538    float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
 539    double a = atan2(dy, dx);
 540    float c_a = (float) cos(a), s_a = (float) sin(a);
 541    uint i;
 542
 543    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 544    dx = 0.5F * half_width;
 545    dy = half_width;
 546
 547    /* allocate/dup new verts */
 548    for (i = 0; i < 8; i++) {
 549       v[i] = dup_vert(stage, header->v[i/4], i);
 550    }
 551
 552    /*
 553     * Quad strip for line from v0 to v1 (*=endpoints):
 554     *
 555     *  1   3                     5   7
 556     *  +---+---------------------+---+
 557     *  |                             |
 558     *  | *v0                     v1* |
 559     *  |                             |
 560     *  +---+---------------------+---+
 561     *  0   2                     4   6
 562     */
 563
 564    /* new verts */
 565    pos = v[0]->data[posPos];
 566    pos[0] += (-dx * c_a -  dy * s_a);
 567    pos[1] += (-dx * s_a +  dy * c_a);
 568
 569    pos = v[1]->data[posPos];
 570    pos[0] += (-dx * c_a - -dy * s_a);
 571    pos[1] += (-dx * s_a + -dy * c_a);
 572
 573    pos = v[2]->data[posPos];
 574    pos[0] += ( dx * c_a -  dy * s_a);
 575    pos[1] += ( dx * s_a +  dy * c_a);
 576
 577    pos = v[3]->data[posPos];
 578    pos[0] += ( dx * c_a - -dy * s_a);
 579    pos[1] += ( dx * s_a + -dy * c_a);
 580
 581    pos = v[4]->data[posPos];
 582    pos[0] += (-dx * c_a -  dy * s_a);
 583    pos[1] += (-dx * s_a +  dy * c_a);
 584
 585    pos = v[5]->data[posPos];
 586    pos[0] += (-dx * c_a - -dy * s_a);
 587    pos[1] += (-dx * s_a + -dy * c_a);
 588
 589    pos = v[6]->data[posPos];
 590    pos[0] += ( dx * c_a -  dy * s_a);
 591    pos[1] += ( dx * s_a +  dy * c_a);
 592
 593    pos = v[7]->data[posPos];
 594    pos[0] += ( dx * c_a - -dy * s_a);
 595    pos[1] += ( dx * s_a + -dy * c_a);
 596
 597    /* new texcoords */
 598    tex = v[0]->data[texPos];
 599    ASSIGN_4V(tex, 0, 0, 0, 1);
 600
 601    tex = v[1]->data[texPos];
 602    ASSIGN_4V(tex, 0, 1, 0, 1);
 603
 604    tex = v[2]->data[texPos];
 605    ASSIGN_4V(tex, .5, 0, 0, 1);
 606
 607    tex = v[3]->data[texPos];
 608    ASSIGN_4V(tex, .5, 1, 0, 1);
 609
 610    tex = v[4]->data[texPos];
 611    ASSIGN_4V(tex, .5, 0, 0, 1);
 612
 613    tex = v[5]->data[texPos];
 614    ASSIGN_4V(tex, .5, 1, 0, 1);
 615
 616    tex = v[6]->data[texPos];
 617    ASSIGN_4V(tex, 1, 0, 0, 1);
 618
 619    tex = v[7]->data[texPos];
 620    ASSIGN_4V(tex, 1, 1, 0, 1);
 621
 622    /* emit 6 tris for the quad strip */
 623    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 624    stage->next->tri( stage->next, &tri );
 625
 626    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 627    stage->next->tri( stage->next, &tri );
 628
 629    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 630    stage->next->tri( stage->next, &tri );
 631
 632    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 633    stage->next->tri( stage->next, &tri );
 634
 635    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 636    stage->next->tri( stage->next, &tri );
 637
 638    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 639    stage->next->tri( stage->next, &tri );
 640 }
 641
 642
 643 static void
 644 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 645 {
 646    auto struct aaline_stage *aaline = aaline_stage(stage);
 647    struct draw_context *draw = stage->draw;
 648    struct pipe_context *pipe = draw->pipe;
 649    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 650    uint num_samplers;
 651    uint num_sampler_views;
 652    void *r;
 653
 654    assert(draw->rasterizer->line_smooth);
 655
 656    if (draw->rasterizer->line_width <= 2.2)
 657       aaline->half_line_width = 1.1f;
 658    else
 659       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 660
 661    /*
 662     * Bind (generate) our fragprog, sampler and texture
 663     */
 664    if (!bind_aaline_fragment_shader(aaline)) {
 665       stage->line = draw_pipe_passthrough_line;
 666       stage->line(stage, header);
 667       return;
 668    }
 669
 670    draw_aaline_prepare_outputs(draw, draw->pipeline.aaline);
 671
 672    /* how many samplers? */
 673    /* we'll use sampler/texture[aaline->sampler_unit] for the alpha texture */
 674    num_samplers = MAX2(aaline->num_samplers, aaline->fs->sampler_unit + 1);
 675    num_sampler_views = MAX2(num_samplers, aaline->num_sampler_views);
 676
 677    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 678    pipe_sampler_view_reference(&aaline->state.sampler_views[aaline->fs->sampler_unit],
 679                                aaline->sampler_view);
 680
 681    draw->suspend_flushing = TRUE;
 682
 683    aaline->driver_bind_sampler_states(pipe, PIPE_SHADER_FRAGMENT, 0,
 684                                       num_samplers, aaline->state.sampler);
 685
 686    aaline->driver_set_sampler_views(pipe, PIPE_SHADER_FRAGMENT, 0,
 687                                     num_sampler_views, aaline->state.sampler_views);
 688
 689    /* Disable triangle culling, stippling, unfilled mode etc. */
 690    r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
 691    pipe->bind_rasterizer_state(pipe, r);
 692
 693    draw->suspend_flushing = FALSE;
 694
 695    /* now really draw first line */
 696    stage->line = aaline_line;
 697    stage->line(stage, header);
 698 }
 699
 700
 701 static void
 702 aaline_flush(struct draw_stage *stage, unsigned flags)
 703 {
 704    struct draw_context *draw = stage->draw;
 705    struct aaline_stage *aaline = aaline_stage(stage);
 706    struct pipe_context *pipe = draw->pipe;
 707
 708    stage->line = aaline_first_line;
 709    stage->next->flush( stage->next, flags );
 710
 711    /* restore original frag shader, texture, sampler state */
 712    draw->suspend_flushing = TRUE;
 713    aaline->driver_bind_fs_state(pipe, aaline->fs ? aaline->fs->driver_fs : NULL);
 714
 715    aaline->driver_bind_sampler_states(pipe, PIPE_SHADER_FRAGMENT, 0,
 716                                       aaline->num_samplers,
 717                                       aaline->state.sampler);
 718
 719    aaline->driver_set_sampler_views(pipe, PIPE_SHADER_FRAGMENT, 0,
 720                                     aaline->num_samplers,
 721                                     aaline->state.sampler_views);
 722
 723    /* restore original rasterizer state */
 724    if (draw->rast_handle) {
 725       pipe->bind_rasterizer_state(pipe, draw->rast_handle);
 726    }
 727
 728    draw->suspend_flushing = FALSE;
 729
 730    draw_remove_extra_vertex_attribs(draw);
 731 }
 732
 733
 734 static void
 735 aaline_reset_stipple_counter(struct draw_stage *stage)
 736 {
 737    stage->next->reset_stipple_counter( stage->next );
 738 }
 739
 740
 741 static void
 742 aaline_destroy(struct draw_stage *stage)
 743 {
 744    struct aaline_stage *aaline = aaline_stage(stage);
 745    struct pipe_context *pipe = stage->draw->pipe;
 746    uint i;
 747
 748    for (i = 0; i < PIPE_MAX_SHADER_SAMPLER_VIEWS; i++) {
 749       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 750    }
 751
 752    if (aaline->sampler_cso)
 753       pipe->delete_sampler_state(pipe, aaline->sampler_cso);
 754
 755    if (aaline->texture)
 756       pipe_resource_reference(&aaline->texture, NULL);
 757
 758    if (aaline->sampler_view) {
 759       pipe_sampler_view_reference(&aaline->sampler_view, NULL);
 760    }
 761
 762    draw_free_temp_verts( stage );
 763
 764    /* restore the old entry points */
 765    pipe->create_fs_state = aaline->driver_create_fs_state;
 766    pipe->bind_fs_state = aaline->driver_bind_fs_state;
 767    pipe->delete_fs_state = aaline->driver_delete_fs_state;
 768
 769    pipe->bind_sampler_states = aaline->driver_bind_sampler_states;
 770    pipe->set_sampler_views = aaline->driver_set_sampler_views;
 771
 772    FREE( stage );
 773 }
 774
 775
 776 static struct aaline_stage *
 777 draw_aaline_stage(struct draw_context *draw)
 778 {
 779    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 780    if (!aaline)
 781       return NULL;
 782
 783    aaline->stage.draw = draw;
 784    aaline->stage.name = "aaline";
 785    aaline->stage.next = NULL;
 786    aaline->stage.point = draw_pipe_passthrough_point;
 787    aaline->stage.line = aaline_first_line;
 788    aaline->stage.tri = draw_pipe_passthrough_tri;
 789    aaline->stage.flush = aaline_flush;
 790    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 791    aaline->stage.destroy = aaline_destroy;
 792
 793    if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
 794       goto fail;
 795
 796    return aaline;
 797
 798  fail:
 799    aaline->stage.destroy(&aaline->stage);
 800
 801    return NULL;
 802 }
 803
 804
 805 static struct aaline_stage *
 806 aaline_stage_from_pipe(struct pipe_context *pipe)
 807 {
 808    struct draw_context *draw = (struct draw_context *) pipe->draw;
 809
 810    if (draw) {
 811       return aaline_stage(draw->pipeline.aaline);
 812    } else {
 813       return NULL;
 814    }
 815 }
 816
 817
 818 /**
 819  * This function overrides the driver's create_fs_state() function and
 820  * will typically be called by the state tracker.
 821  */
 822 static void *
 823 aaline_create_fs_state(struct pipe_context *pipe,
 824                        const struct pipe_shader_state *fs)
 825 {
 826    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 827    struct aaline_fragment_shader *aafs = NULL;
 828
 829    if (!aaline)
 830       return NULL;
 831
 832    aafs = CALLOC_STRUCT(aaline_fragment_shader);
 833
 834    if (!aafs)
 835       return NULL;
 836
 837    aafs->state.tokens = tgsi_dup_tokens(fs->tokens);
 838
 839    /* pass-through */
 840    aafs->driver_fs = aaline->driver_create_fs_state(pipe, fs);
 841
 842    return aafs;
 843 }
 844
 845
 846 static void
 847 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 848 {
 849    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 850    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 851
 852    if (!aaline) {
 853       return;
 854    }
 855
 856    /* save current */
 857    aaline->fs = aafs;
 858    /* pass-through */
 859    aaline->driver_bind_fs_state(pipe, (aafs ? aafs->driver_fs : NULL));
 860 }
 861
 862
 863 static void
 864 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 865 {
 866    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 867    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 868
 869    if (!aafs) {
 870       return;
 871    }
 872
 873    if (aaline) {
 874       /* pass-through */
 875       aaline->driver_delete_fs_state(pipe, aafs->driver_fs);
 876
 877       if (aafs->aaline_fs)
 878          aaline->driver_delete_fs_state(pipe, aafs->aaline_fs);
 879    }
 880
 881    FREE((void*)aafs->state.tokens);
 882    FREE(aafs);
 883 }
 884
 885
 886 static void
 887 aaline_bind_sampler_states(struct pipe_context *pipe, unsigned shader,
 888                            unsigned start, unsigned num, void **sampler)
 889 {
 890    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 891
 892    assert(start == 0);
 893
 894    if (!aaline) {
 895       return;
 896    }
 897
 898    if (shader == PIPE_SHADER_FRAGMENT) {
 899       /* save current */
 900       memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 901       aaline->num_samplers = num;
 902    }
 903
 904    /* pass-through */
 905    aaline->driver_bind_sampler_states(pipe, shader, start, num, sampler);
 906 }
 907
 908
 909 static void
 910 aaline_set_sampler_views(struct pipe_context *pipe, unsigned shader,
 911                          unsigned start, unsigned num,
 912                          struct pipe_sampler_view **views)
 913 {
 914    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 915    uint i;
 916
 917    if (!aaline) {
 918       return;
 919    }
 920
 921    if (shader == PIPE_SHADER_FRAGMENT) {
 922       /* save current */
 923       for (i = 0; i < num; i++) {
 924          pipe_sampler_view_reference(&aaline->state.sampler_views[start + i],
 925                                      views[i]);
 926       }
 927       aaline->num_sampler_views = num;
 928    }
 929
 930    /* pass-through */
 931    aaline->driver_set_sampler_views(pipe, shader, start, num, views);
 932 }
 933
 934
 935 void
 936 draw_aaline_prepare_outputs(struct draw_context *draw,
 937                             struct draw_stage *stage)
 938 {
 939    struct aaline_stage *aaline = aaline_stage(stage);
 940    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 941
 942    /* update vertex attrib info */
 943    aaline->pos_slot = draw_current_shader_position_output(draw);
 944
 945    if (!rast->line_smooth)
 946       return;
 947
 948    /* allocate the extra post-transformed vertex attribute */
 949    aaline->tex_slot = draw_alloc_extra_vertex_attrib(draw,
 950                                                      TGSI_SEMANTIC_GENERIC,
 951                                                      aaline->fs->generic_attrib);
 952 }
 953
 954 /**
 955  * Called by drivers that want to install this AA line prim stage
 956  * into the draw module's pipeline.  This will not be used if the
 957  * hardware has native support for AA lines.
 958  */
 959 boolean
 960 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 961 {
 962    struct aaline_stage *aaline;
 963
 964    pipe->draw = (void *) draw;
 965
 966    /*
 967     * Create / install AA line drawing / prim stage
 968     */
 969    aaline = draw_aaline_stage( draw );
 970    if (!aaline)
 971       goto fail;
 972
 973    /* save original driver functions */
 974    aaline->driver_create_fs_state = pipe->create_fs_state;
 975    aaline->driver_bind_fs_state = pipe->bind_fs_state;
 976    aaline->driver_delete_fs_state = pipe->delete_fs_state;
 977
 978    aaline->driver_bind_sampler_states = pipe->bind_sampler_states;
 979    aaline->driver_set_sampler_views = pipe->set_sampler_views;
 980
 981    /* create special texture, sampler state */
 982    if (!aaline_create_texture(aaline))
 983       goto fail;
 984
 985    if (!aaline_create_sampler(aaline))
 986       goto fail;
 987
 988    /* override the driver's functions */
 989    pipe->create_fs_state = aaline_create_fs_state;
 990    pipe->bind_fs_state = aaline_bind_fs_state;
 991    pipe->delete_fs_state = aaline_delete_fs_state;
 992
 993    pipe->bind_sampler_states = aaline_bind_sampler_states;
 994    pipe->set_sampler_views = aaline_set_sampler_views;
 995
 996    /* Install once everything is known to be OK:
 997     */
 998    draw->pipeline.aaline = &aaline->stage;
 999
1000    return TRUE;
1001
1002  fail:
1003    if (aaline)
1004       aaline->stage.destroy( &aaline->stage );
1005
1006    return FALSE;
1007 }