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 50
  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    int freeSampler;  /** an available sampler for the pstipple */
 141    int maxInput, maxGeneric;  /**< max input index found */
 142    int colorTemp, texTemp;  /**< temp registers */
 143 };
 144
 145
 146 /**
 147  * TGSI declaration transform callback.
 148  * Look for a free sampler, a free input attrib, and two free temp regs.
 149  */
 150 static void
 151 aa_transform_decl(struct tgsi_transform_context *ctx,
 152                   struct tgsi_full_declaration *decl)
 153 {
 154    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 155
 156    if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
 157        decl->Semantic.Name == TGSI_SEMANTIC_COLOR &&
 158        decl->Semantic.Index == 0) {
 159       aactx->colorOutput = decl->Range.First;
 160    }
 161    else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
 162       uint i;
 163       for (i = decl->Range.First;
 164            i <= decl->Range.Last; i++) {
 165          aactx->samplersUsed |= 1 << i;
 166       }
 167    }
 168    else if (decl->Declaration.File == TGSI_FILE_INPUT) {
 169       if ((int) decl->Range.Last > aactx->maxInput)
 170          aactx->maxInput = decl->Range.Last;
 171       if (decl->Semantic.Name == TGSI_SEMANTIC_GENERIC &&
 172            (int) decl->Semantic.Index > aactx->maxGeneric) {
 173          aactx->maxGeneric = decl->Semantic.Index;
 174       }
 175    }
 176    else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
 177       uint i;
 178       for (i = decl->Range.First;
 179            i <= decl->Range.Last; i++) {
 180          aactx->tempsUsed |= (1 << i);
 181       }
 182    }
 183
 184    ctx->emit_declaration(ctx, decl);
 185 }
 186
 187
 188 /**
 189  * Find the lowest zero bit in the given word, or -1 if bitfield is all ones.
 190  */
 191 static int
 192 free_bit(uint bitfield)
 193 {
 194    return ffs(~bitfield) - 1;
 195 }
 196
 197
 198 /**
 199  * TGSI transform prolog callback.
 200  */
 201 static void
 202 aa_transform_prolog(struct tgsi_transform_context *ctx)
 203 {
 204    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 205    struct tgsi_full_declaration decl;
 206    uint i;
 207
 208    /* find free sampler */
 209    aactx->freeSampler = free_bit(aactx->samplersUsed);
 210    if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
 211       aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
 212
 213    /* find two free temp regs */
 214    for (i = 0; i < 32; i++) {
 215       if ((aactx->tempsUsed & (1 << i)) == 0) {
 216       /* found a free temp */
 217       if (aactx->colorTemp < 0)
 218          aactx->colorTemp  = i;
 219       else if (aactx->texTemp < 0)
 220          aactx->texTemp  = i;
 221       else
 222          break;
 223       }
 224    }
 225    assert(aactx->colorTemp >= 0);
 226    assert(aactx->texTemp >= 0);
 227
 228    /* declare new generic input/texcoord */
 229    decl = tgsi_default_full_declaration();
 230    decl.Declaration.File = TGSI_FILE_INPUT;
 231    /* XXX this could be linear... */
 232    decl.Declaration.Interpolate = 1;
 233    decl.Declaration.Semantic = 1;
 234    decl.Semantic.Name = TGSI_SEMANTIC_GENERIC;
 235    decl.Semantic.Index = aactx->maxGeneric + 1;
 236    decl.Range.First =
 237    decl.Range.Last = aactx->maxInput + 1;
 238    decl.Interp.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
 239    ctx->emit_declaration(ctx, &decl);
 240
 241    /* declare new sampler */
 242    decl = tgsi_default_full_declaration();
 243    decl.Declaration.File = TGSI_FILE_SAMPLER;
 244    decl.Range.First =
 245    decl.Range.Last = aactx->freeSampler;
 246    ctx->emit_declaration(ctx, &decl);
 247
 248    /* declare new temp regs */
 249    decl = tgsi_default_full_declaration();
 250    decl.Declaration.File = TGSI_FILE_TEMPORARY;
 251    decl.Range.First =
 252    decl.Range.Last = aactx->texTemp;
 253    ctx->emit_declaration(ctx, &decl);
 254
 255    decl = tgsi_default_full_declaration();
 256    decl.Declaration.File = TGSI_FILE_TEMPORARY;
 257    decl.Range.First =
 258    decl.Range.Last = aactx->colorTemp;
 259    ctx->emit_declaration(ctx, &decl);
 260 }
 261
 262
 263 /**
 264  * TGSI transform epilog callback.
 265  */
 266 static void
 267 aa_transform_epilog(struct tgsi_transform_context *ctx)
 268 {
 269    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 270
 271    if (aactx->colorOutput != -1) {
 272       /* insert texture sampling code for antialiasing. */
 273       struct tgsi_full_instruction newInst;
 274
 275       /* TEX */
 276       newInst = tgsi_default_full_instruction();
 277       newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
 278       newInst.Instruction.NumDstRegs = 1;
 279       newInst.Dst[0].Register.File = TGSI_FILE_TEMPORARY;
 280       newInst.Dst[0].Register.Index = aactx->texTemp;
 281       newInst.Instruction.NumSrcRegs = 2;
 282       newInst.Instruction.Texture = TRUE;
 283       newInst.Texture.Texture = TGSI_TEXTURE_2D;
 284       newInst.Src[0].Register.File = TGSI_FILE_INPUT;
 285       newInst.Src[0].Register.Index = aactx->maxInput + 1;
 286       newInst.Src[1].Register.File = TGSI_FILE_SAMPLER;
 287       newInst.Src[1].Register.Index = aactx->freeSampler;
 288       ctx->emit_instruction(ctx, &newInst);
 289
 290       /* MOV rgb */
 291       newInst = tgsi_default_full_instruction();
 292       newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
 293       newInst.Instruction.NumDstRegs = 1;
 294       newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
 295       newInst.Dst[0].Register.Index = aactx->colorOutput;
 296       newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_XYZ;
 297       newInst.Instruction.NumSrcRegs = 1;
 298       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 299       newInst.Src[0].Register.Index = aactx->colorTemp;
 300       ctx->emit_instruction(ctx, &newInst);
 301
 302       /* MUL alpha */
 303       newInst = tgsi_default_full_instruction();
 304       newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
 305       newInst.Instruction.NumDstRegs = 1;
 306       newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
 307       newInst.Dst[0].Register.Index = aactx->colorOutput;
 308       newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_W;
 309       newInst.Instruction.NumSrcRegs = 2;
 310       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 311       newInst.Src[0].Register.Index = aactx->colorTemp;
 312       newInst.Src[1].Register.File = TGSI_FILE_TEMPORARY;
 313       newInst.Src[1].Register.Index = aactx->texTemp;
 314       ctx->emit_instruction(ctx, &newInst);
 315    }
 316 }
 317
 318
 319 /**
 320  * TGSI instruction transform callback.
 321  * Replace writes to result.color w/ a temp reg.
 322  */
 323 static void
 324 aa_transform_inst(struct tgsi_transform_context *ctx,
 325                   struct tgsi_full_instruction *inst)
 326 {
 327    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 328    uint i;
 329
 330    /*
 331     * Look for writes to result.color and replace with colorTemp reg.
 332     */
 333    for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 334       struct tgsi_full_dst_register *dst = &inst->Dst[i];
 335       if (dst->Register.File == TGSI_FILE_OUTPUT &&
 336           dst->Register.Index == aactx->colorOutput) {
 337          dst->Register.File = TGSI_FILE_TEMPORARY;
 338          dst->Register.Index = aactx->colorTemp;
 339       }
 340    }
 341
 342    ctx->emit_instruction(ctx, inst);
 343 }
 344
 345
 346 /**
 347  * Generate the frag shader we'll use for drawing AA lines.
 348  * This will be the user's shader plus some texture/modulate instructions.
 349  */
 350 static boolean
 351 generate_aaline_fs(struct aaline_stage *aaline)
 352 {
 353    struct pipe_context *pipe = aaline->stage.draw->pipe;
 354    const struct pipe_shader_state *orig_fs = &aaline->fs->state;
 355    struct pipe_shader_state aaline_fs;
 356    struct aa_transform_context transform;
 357    const uint newLen = tgsi_num_tokens(orig_fs->tokens) + NUM_NEW_TOKENS;
 358
 359    aaline_fs = *orig_fs; /* copy to init */
 360    aaline_fs.tokens = tgsi_alloc_tokens(newLen);
 361    if (aaline_fs.tokens == NULL)
 362       return FALSE;
 363
 364    memset(&transform, 0, sizeof(transform));
 365    transform.colorOutput = -1;
 366    transform.maxInput = -1;
 367    transform.maxGeneric = -1;
 368    transform.colorTemp = -1;
 369    transform.texTemp = -1;
 370    transform.base.prolog = aa_transform_prolog;
 371    transform.base.epilog = aa_transform_epilog;
 372    transform.base.transform_instruction = aa_transform_inst;
 373    transform.base.transform_declaration = aa_transform_decl;
 374
 375    tgsi_transform_shader(orig_fs->tokens,
 376                          (struct tgsi_token *) aaline_fs.tokens,
 377                          newLen, &transform.base);
 378
 379 #if 0 /* DEBUG */
 380    debug_printf("draw_aaline, orig shader:\n");
 381    tgsi_dump(orig_fs->tokens, 0);
 382    debug_printf("draw_aaline, new shader:\n");
 383    tgsi_dump(aaline_fs.tokens, 0);
 384 #endif
 385
 386    aaline->fs->sampler_unit = transform.freeSampler;
 387
 388    aaline->fs->aaline_fs = aaline->driver_create_fs_state(pipe, &aaline_fs);
 389    if (aaline->fs->aaline_fs == NULL)
 390       goto fail;
 391
 392    aaline->fs->generic_attrib = transform.maxGeneric + 1;
 393    FREE((void *)aaline_fs.tokens);
 394    return TRUE;
 395
 396 fail:
 397    FREE((void *)aaline_fs.tokens);
 398    return FALSE;
 399 }
 400
 401
 402 /**
 403  * Create the texture map we'll use for antialiasing the lines.
 404  */
 405 static boolean
 406 aaline_create_texture(struct aaline_stage *aaline)
 407 {
 408    struct pipe_context *pipe = aaline->stage.draw->pipe;
 409    struct pipe_screen *screen = pipe->screen;
 410    struct pipe_resource texTemp;
 411    struct pipe_sampler_view viewTempl;
 412    uint level;
 413
 414    memset(&texTemp, 0, sizeof(texTemp));
 415    texTemp.target = PIPE_TEXTURE_2D;
 416    texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
 417    texTemp.last_level = MAX_TEXTURE_LEVEL;
 418    texTemp.width0 = 1 << TEXTURE_SIZE_LOG2;
 419    texTemp.height0 = 1 << TEXTURE_SIZE_LOG2;
 420    texTemp.depth0 = 1;
 421    texTemp.array_size = 1;
 422    texTemp.bind = PIPE_BIND_SAMPLER_VIEW;
 423
 424    aaline->texture = screen->resource_create(screen, &texTemp);
 425    if (!aaline->texture)
 426       return FALSE;
 427
 428    u_sampler_view_default_template(&viewTempl,
 429                                    aaline->texture,
 430                                    aaline->texture->format);
 431    aaline->sampler_view = pipe->create_sampler_view(pipe,
 432                                                     aaline->texture,
 433                                                     &viewTempl);
 434    if (!aaline->sampler_view) {
 435       return FALSE;
 436    }
 437
 438    /* Fill in mipmap images.
 439     * Basically each level is solid opaque, except for the outermost
 440     * texels which are zero.  Special case the 1x1 and 2x2 levels
 441     * (though, those levels shouldn't be used - see the max_lod setting).
 442     */
 443    for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
 444       struct pipe_transfer *transfer;
 445       struct pipe_box box;
 446       const uint size = u_minify(aaline->texture->width0, level);
 447       ubyte *data;
 448       uint i, j;
 449
 450       assert(aaline->texture->width0 == aaline->texture->height0);
 451
 452       u_box_origin_2d( size, size, &box );
 453
 454       /* This texture is new, no need to flush.
 455        */
 456       data = pipe->transfer_map(pipe,
 457                                 aaline->texture,
 458                                 level,
 459                                 PIPE_TRANSFER_WRITE,
 460                                 &box, &transfer);
 461
 462       if (data == NULL)
 463          return FALSE;
 464
 465       for (i = 0; i < size; i++) {
 466          for (j = 0; j < size; j++) {
 467             ubyte d;
 468             if (size == 1) {
 469                d = 255;
 470             }
 471             else if (size == 2) {
 472                d = 200; /* tuneable */
 473             }
 474             else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
 475                d = 35;  /* edge texel */
 476             }
 477             else {
 478                d = 255;
 479             }
 480             data[i * transfer->stride + j] = d;
 481          }
 482       }
 483
 484       /* unmap */
 485       pipe->transfer_unmap(pipe, transfer);
 486    }
 487    return TRUE;
 488 }
 489
 490
 491 /**
 492  * Create the sampler CSO that'll be used for antialiasing.
 493  * By using a mipmapped texture, we don't have to generate a different
 494  * texture image for each line size.
 495  */
 496 static boolean
 497 aaline_create_sampler(struct aaline_stage *aaline)
 498 {
 499    struct pipe_sampler_state sampler;
 500    struct pipe_context *pipe = aaline->stage.draw->pipe;
 501
 502    memset(&sampler, 0, sizeof(sampler));
 503    sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 504    sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 505    sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 506    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
 507    sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
 508    sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
 509    sampler.normalized_coords = 1;
 510    sampler.min_lod = 0.0f;
 511    sampler.max_lod = MAX_TEXTURE_LEVEL;
 512
 513    aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 514    if (aaline->sampler_cso == NULL)
 515       return FALSE;
 516
 517    return TRUE;
 518 }
 519
 520
 521 /**
 522  * When we're about to draw our first AA line in a batch, this function is
 523  * called to tell the driver to bind our modified fragment shader.
 524  */
 525 static boolean
 526 bind_aaline_fragment_shader(struct aaline_stage *aaline)
 527 {
 528    struct draw_context *draw = aaline->stage.draw;
 529    struct pipe_context *pipe = draw->pipe;
 530
 531    if (!aaline->fs->aaline_fs &&
 532        !generate_aaline_fs(aaline))
 533       return FALSE;
 534
 535    draw->suspend_flushing = TRUE;
 536    aaline->driver_bind_fs_state(pipe, aaline->fs->aaline_fs);
 537    draw->suspend_flushing = FALSE;
 538
 539    return TRUE;
 540 }
 541
 542
 543
 544 static INLINE struct aaline_stage *
 545 aaline_stage( struct draw_stage *stage )
 546 {
 547    return (struct aaline_stage *) stage;
 548 }
 549
 550
 551 /**
 552  * Draw a wide line by drawing a quad, using geometry which will
 553  * fullfill GL's antialiased line requirements.
 554  */
 555 static void
 556 aaline_line(struct draw_stage *stage, struct prim_header *header)
 557 {
 558    const struct aaline_stage *aaline = aaline_stage(stage);
 559    const float half_width = aaline->half_line_width;
 560    struct prim_header tri;
 561    struct vertex_header *v[8];
 562    uint texPos = aaline->tex_slot;
 563    uint posPos = aaline->pos_slot;
 564    float *pos, *tex;
 565    float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
 566    float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
 567    double a = atan2(dy, dx);
 568    float c_a = (float) cos(a), s_a = (float) sin(a);
 569    uint i;
 570
 571    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 572    dx = 0.5F * half_width;
 573    dy = half_width;
 574
 575    /* allocate/dup new verts */
 576    for (i = 0; i < 8; i++) {
 577       v[i] = dup_vert(stage, header->v[i/4], i);
 578    }
 579
 580    /*
 581     * Quad strip for line from v0 to v1 (*=endpoints):
 582     *
 583     *  1   3                     5   7
 584     *  +---+---------------------+---+
 585     *  |                             |
 586     *  | *v0                     v1* |
 587     *  |                             |
 588     *  +---+---------------------+---+
 589     *  0   2                     4   6
 590     */
 591
 592    /* new verts */
 593    pos = v[0]->data[posPos];
 594    pos[0] += (-dx * c_a -  dy * s_a);
 595    pos[1] += (-dx * s_a +  dy * c_a);
 596
 597    pos = v[1]->data[posPos];
 598    pos[0] += (-dx * c_a - -dy * s_a);
 599    pos[1] += (-dx * s_a + -dy * c_a);
 600
 601    pos = v[2]->data[posPos];
 602    pos[0] += ( dx * c_a -  dy * s_a);
 603    pos[1] += ( dx * s_a +  dy * c_a);
 604
 605    pos = v[3]->data[posPos];
 606    pos[0] += ( dx * c_a - -dy * s_a);
 607    pos[1] += ( dx * s_a + -dy * c_a);
 608
 609    pos = v[4]->data[posPos];
 610    pos[0] += (-dx * c_a -  dy * s_a);
 611    pos[1] += (-dx * s_a +  dy * c_a);
 612
 613    pos = v[5]->data[posPos];
 614    pos[0] += (-dx * c_a - -dy * s_a);
 615    pos[1] += (-dx * s_a + -dy * c_a);
 616
 617    pos = v[6]->data[posPos];
 618    pos[0] += ( dx * c_a -  dy * s_a);
 619    pos[1] += ( dx * s_a +  dy * c_a);
 620
 621    pos = v[7]->data[posPos];
 622    pos[0] += ( dx * c_a - -dy * s_a);
 623    pos[1] += ( dx * s_a + -dy * c_a);
 624
 625    /* new texcoords */
 626    tex = v[0]->data[texPos];
 627    ASSIGN_4V(tex, 0, 0, 0, 1);
 628
 629    tex = v[1]->data[texPos];
 630    ASSIGN_4V(tex, 0, 1, 0, 1);
 631
 632    tex = v[2]->data[texPos];
 633    ASSIGN_4V(tex, .5, 0, 0, 1);
 634
 635    tex = v[3]->data[texPos];
 636    ASSIGN_4V(tex, .5, 1, 0, 1);
 637
 638    tex = v[4]->data[texPos];
 639    ASSIGN_4V(tex, .5, 0, 0, 1);
 640
 641    tex = v[5]->data[texPos];
 642    ASSIGN_4V(tex, .5, 1, 0, 1);
 643
 644    tex = v[6]->data[texPos];
 645    ASSIGN_4V(tex, 1, 0, 0, 1);
 646
 647    tex = v[7]->data[texPos];
 648    ASSIGN_4V(tex, 1, 1, 0, 1);
 649
 650    /* emit 6 tris for the quad strip */
 651    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 652    stage->next->tri( stage->next, &tri );
 653
 654    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 655    stage->next->tri( stage->next, &tri );
 656
 657    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 658    stage->next->tri( stage->next, &tri );
 659
 660    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 661    stage->next->tri( stage->next, &tri );
 662
 663    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 664    stage->next->tri( stage->next, &tri );
 665
 666    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 667    stage->next->tri( stage->next, &tri );
 668 }
 669
 670
 671 static void
 672 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 673 {
 674    auto struct aaline_stage *aaline = aaline_stage(stage);
 675    struct draw_context *draw = stage->draw;
 676    struct pipe_context *pipe = draw->pipe;
 677    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 678    uint num_samplers;
 679    void *r;
 680
 681    assert(draw->rasterizer->line_smooth);
 682
 683    if (draw->rasterizer->line_width <= 2.2)
 684       aaline->half_line_width = 1.1f;
 685    else
 686       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 687
 688    /*
 689     * Bind (generate) our fragprog, sampler and texture
 690     */
 691    if (!bind_aaline_fragment_shader(aaline)) {
 692       stage->line = draw_pipe_passthrough_line;
 693       stage->line(stage, header);
 694       return;
 695    }
 696
 697    draw_aaline_prepare_outputs(draw, draw->pipeline.aaline);
 698
 699    /* how many samplers? */
 700    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 701    num_samplers = MAX2(aaline->num_sampler_views, aaline->num_samplers);
 702    num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
 703
 704    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 705    pipe_sampler_view_reference(&aaline->state.sampler_views[aaline->fs->sampler_unit],
 706                                aaline->sampler_view);
 707
 708    draw->suspend_flushing = TRUE;
 709
 710    aaline->driver_bind_sampler_states(pipe, PIPE_SHADER_FRAGMENT, 0,
 711                                       num_samplers, aaline->state.sampler);
 712
 713    aaline->driver_set_sampler_views(pipe, PIPE_SHADER_FRAGMENT, 0,
 714                                     num_samplers, aaline->state.sampler_views);
 715
 716    /* Disable triangle culling, stippling, unfilled mode etc. */
 717    r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
 718    pipe->bind_rasterizer_state(pipe, r);
 719
 720    draw->suspend_flushing = FALSE;
 721
 722    /* now really draw first line */
 723    stage->line = aaline_line;
 724    stage->line(stage, header);
 725 }
 726
 727
 728 static void
 729 aaline_flush(struct draw_stage *stage, unsigned flags)
 730 {
 731    struct draw_context *draw = stage->draw;
 732    struct aaline_stage *aaline = aaline_stage(stage);
 733    struct pipe_context *pipe = draw->pipe;
 734
 735    stage->line = aaline_first_line;
 736    stage->next->flush( stage->next, flags );
 737
 738    /* restore original frag shader, texture, sampler state */
 739    draw->suspend_flushing = TRUE;
 740    aaline->driver_bind_fs_state(pipe, aaline->fs ? aaline->fs->driver_fs : NULL);
 741
 742    aaline->driver_bind_sampler_states(pipe, PIPE_SHADER_FRAGMENT, 0,
 743                                       aaline->num_samplers,
 744                                       aaline->state.sampler);
 745
 746    aaline->driver_set_sampler_views(pipe, PIPE_SHADER_FRAGMENT, 0,
 747                                     aaline->num_samplers,
 748                                     aaline->state.sampler_views);
 749
 750    /* restore original rasterizer state */
 751    if (draw->rast_handle) {
 752       pipe->bind_rasterizer_state(pipe, draw->rast_handle);
 753    }
 754
 755    draw->suspend_flushing = FALSE;
 756
 757    draw_remove_extra_vertex_attribs(draw);
 758 }
 759
 760
 761 static void
 762 aaline_reset_stipple_counter(struct draw_stage *stage)
 763 {
 764    stage->next->reset_stipple_counter( stage->next );
 765 }
 766
 767
 768 static void
 769 aaline_destroy(struct draw_stage *stage)
 770 {
 771    struct aaline_stage *aaline = aaline_stage(stage);
 772    struct pipe_context *pipe = stage->draw->pipe;
 773    uint i;
 774
 775    for (i = 0; i < PIPE_MAX_SHADER_SAMPLER_VIEWS; i++) {
 776       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 777    }
 778
 779    if (aaline->sampler_cso)
 780       pipe->delete_sampler_state(pipe, aaline->sampler_cso);
 781
 782    if (aaline->texture)
 783       pipe_resource_reference(&aaline->texture, NULL);
 784
 785    if (aaline->sampler_view) {
 786       pipe_sampler_view_reference(&aaline->sampler_view, NULL);
 787    }
 788
 789    draw_free_temp_verts( stage );
 790
 791    /* restore the old entry points */
 792    pipe->create_fs_state = aaline->driver_create_fs_state;
 793    pipe->bind_fs_state = aaline->driver_bind_fs_state;
 794    pipe->delete_fs_state = aaline->driver_delete_fs_state;
 795
 796    pipe->bind_sampler_states = aaline->driver_bind_sampler_states;
 797    pipe->set_sampler_views = aaline->driver_set_sampler_views;
 798
 799    FREE( stage );
 800 }
 801
 802
 803 static struct aaline_stage *
 804 draw_aaline_stage(struct draw_context *draw)
 805 {
 806    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 807    if (aaline == NULL)
 808       return NULL;
 809
 810    aaline->stage.draw = draw;
 811    aaline->stage.name = "aaline";
 812    aaline->stage.next = NULL;
 813    aaline->stage.point = draw_pipe_passthrough_point;
 814    aaline->stage.line = aaline_first_line;
 815    aaline->stage.tri = draw_pipe_passthrough_tri;
 816    aaline->stage.flush = aaline_flush;
 817    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 818    aaline->stage.destroy = aaline_destroy;
 819
 820    if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
 821       goto fail;
 822
 823    return aaline;
 824
 825  fail:
 826    if (aaline)
 827       aaline->stage.destroy(&aaline->stage);
 828
 829    return NULL;
 830 }
 831
 832
 833 static struct aaline_stage *
 834 aaline_stage_from_pipe(struct pipe_context *pipe)
 835 {
 836    struct draw_context *draw = (struct draw_context *) pipe->draw;
 837
 838    if (draw) {
 839       return aaline_stage(draw->pipeline.aaline);
 840    } else {
 841       return NULL;
 842    }
 843 }
 844
 845
 846 /**
 847  * This function overrides the driver's create_fs_state() function and
 848  * will typically be called by the state tracker.
 849  */
 850 static void *
 851 aaline_create_fs_state(struct pipe_context *pipe,
 852                        const struct pipe_shader_state *fs)
 853 {
 854    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 855    struct aaline_fragment_shader *aafs = NULL;
 856
 857    if (aaline == NULL)
 858       return NULL;
 859
 860    aafs = CALLOC_STRUCT(aaline_fragment_shader);
 861
 862    if (aafs == NULL)
 863       return NULL;
 864
 865    aafs->state.tokens = tgsi_dup_tokens(fs->tokens);
 866
 867    /* pass-through */
 868    aafs->driver_fs = aaline->driver_create_fs_state(pipe, fs);
 869
 870    return aafs;
 871 }
 872
 873
 874 static void
 875 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 876 {
 877    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 878    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 879
 880    if (aaline == NULL) {
 881       return;
 882    }
 883
 884    /* save current */
 885    aaline->fs = aafs;
 886    /* pass-through */
 887    aaline->driver_bind_fs_state(pipe, (aafs ? aafs->driver_fs : NULL));
 888 }
 889
 890
 891 static void
 892 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 893 {
 894    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 895    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 896
 897    if (aafs == NULL) {
 898       return;
 899    }
 900
 901    if (aaline != NULL) {
 902       /* pass-through */
 903       aaline->driver_delete_fs_state(pipe, aafs->driver_fs);
 904
 905       if (aafs->aaline_fs)
 906          aaline->driver_delete_fs_state(pipe, aafs->aaline_fs);
 907    }
 908
 909    FREE((void*)aafs->state.tokens);
 910    FREE(aafs);
 911 }
 912
 913
 914 static void
 915 aaline_bind_sampler_states(struct pipe_context *pipe, unsigned shader,
 916                            unsigned start, unsigned num, void **sampler)
 917 {
 918    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 919
 920    assert(start == 0);
 921
 922    if (aaline == NULL) {
 923       return;
 924    }
 925
 926    if (shader == PIPE_SHADER_FRAGMENT) {
 927       /* save current */
 928       memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 929       aaline->num_samplers = num;
 930    }
 931
 932    /* pass-through */
 933    aaline->driver_bind_sampler_states(pipe, shader, start, num, sampler);
 934 }
 935
 936
 937 static void
 938 aaline_set_sampler_views(struct pipe_context *pipe, unsigned shader,
 939                          unsigned start, unsigned num,
 940                          struct pipe_sampler_view **views)
 941 {
 942    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 943    uint i;
 944
 945    if (aaline == NULL) {
 946       return;
 947    }
 948
 949    if (shader == PIPE_SHADER_FRAGMENT) {
 950       /* save current */
 951       for (i = 0; i < num; i++) {
 952          pipe_sampler_view_reference(&aaline->state.sampler_views[start + i],
 953                                      views[i]);
 954       }
 955       aaline->num_sampler_views = num;
 956    }
 957
 958    /* pass-through */
 959    aaline->driver_set_sampler_views(pipe, shader, start, num, views);
 960 }
 961
 962
 963 void
 964 draw_aaline_prepare_outputs(struct draw_context *draw,
 965                             struct draw_stage *stage)
 966 {
 967    struct aaline_stage *aaline = aaline_stage(stage);
 968    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 969
 970    /* update vertex attrib info */
 971    aaline->pos_slot = draw_current_shader_position_output(draw);;
 972
 973    if (!rast->line_smooth)
 974       return;
 975
 976    /* allocate the extra post-transformed vertex attribute */
 977    aaline->tex_slot = draw_alloc_extra_vertex_attrib(draw,
 978                                                      TGSI_SEMANTIC_GENERIC,
 979                                                      aaline->fs->generic_attrib);
 980 }
 981
 982 /**
 983  * Called by drivers that want to install this AA line prim stage
 984  * into the draw module's pipeline.  This will not be used if the
 985  * hardware has native support for AA lines.
 986  */
 987 boolean
 988 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 989 {
 990    struct aaline_stage *aaline;
 991
 992    pipe->draw = (void *) draw;
 993
 994    /*
 995     * Create / install AA line drawing / prim stage
 996     */
 997    aaline = draw_aaline_stage( draw );
 998    if (!aaline)
 999       goto fail;
1000
1001    /* save original driver functions */
1002    aaline->driver_create_fs_state = pipe->create_fs_state;
1003    aaline->driver_bind_fs_state = pipe->bind_fs_state;
1004    aaline->driver_delete_fs_state = pipe->delete_fs_state;
1005
1006    aaline->driver_bind_sampler_states = pipe->bind_sampler_states;
1007    aaline->driver_set_sampler_views = pipe->set_sampler_views;
1008
1009    /* create special texture, sampler state */
1010    if (!aaline_create_texture(aaline))
1011       goto fail;
1012
1013    if (!aaline_create_sampler(aaline))
1014       goto fail;
1015
1016    /* override the driver's functions */
1017    pipe->create_fs_state = aaline_create_fs_state;
1018    pipe->bind_fs_state = aaline_bind_fs_state;
1019    pipe->delete_fs_state = aaline_delete_fs_state;
1020
1021    pipe->bind_sampler_states = aaline_bind_sampler_states;
1022    pipe->set_sampler_views = aaline_set_sampler_views;
1023
1024    /* Install once everything is known to be OK:
1025     */
1026    draw->pipeline.aaline = &aaline->stage;
1027
1028    return TRUE;
1029
1030  fail:
1031    if (aaline)
1032       aaline->stage.destroy( &aaline->stage );
1033
1034    return FALSE;
1035 }