src/gallium/auxiliary/draw/draw_pipe_aaline.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /**
  29  * AA line stage:  AA lines are converted to texture mapped triangles.
  30  *
  31  * Authors:  Brian Paul
  32  */
  33
  34
  35 #include "pipe/p_context.h"
  36 #include "pipe/p_defines.h"
  37 #include "pipe/p_shader_tokens.h"
  38 #include "util/u_math.h"
  39 #include "util/u_memory.h"
  40
  41 #include "tgsi/tgsi_transform.h"
  42 #include "tgsi/tgsi_dump.h"
  43
  44 #include "draw_context.h"
  45 #include "draw_private.h"
  46 #include "draw_pipe.h"
  47
  48
  49 /**
  50  * Max texture level for the alpha texture used for antialiasing
  51  */
  52 #define MAX_TEXTURE_LEVEL  5   /* 32 x 32 */
  53
  54
  55 /**
  56  * Subclass of pipe_shader_state to carry extra fragment shader info.
  57  */
  58 struct aaline_fragment_shader
  59 {
  60    struct pipe_shader_state state;
  61    void *driver_fs;
  62    void *aaline_fs;
  63    uint sampler_unit;
  64    int generic_attrib;  /**< texcoord/generic used for texture */
  65 };
  66
  67
  68 /**
  69  * Subclass of draw_stage
  70  */
  71 struct aaline_stage
  72 {
  73    struct draw_stage stage;
  74
  75    float half_line_width;
  76
  77    /** For AA lines, this is the vertex attrib slot for the new texcoords */
  78    uint tex_slot;
  79    /** position, not necessarily output zero */
  80    uint pos_slot;
  81
  82    void *sampler_cso;
  83    struct pipe_texture *texture;
  84    uint num_samplers;
  85    uint num_textures;
  86
  87
  88    /*
  89     * Currently bound state
  90     */
  91    struct aaline_fragment_shader *fs;
  92    struct {
  93       void *sampler[PIPE_MAX_SAMPLERS];
  94       struct pipe_texture *texture[PIPE_MAX_SAMPLERS];
  95    } state;
  96
  97    /*
  98     * Driver interface/override functions
  99     */
 100    void * (*driver_create_fs_state)(struct pipe_context *,
 101                                     const struct pipe_shader_state *);
 102    void (*driver_bind_fs_state)(struct pipe_context *, void *);
 103    void (*driver_delete_fs_state)(struct pipe_context *, void *);
 104
 105    void (*driver_bind_sampler_states)(struct pipe_context *, unsigned,
 106                                       void **);
 107    void (*driver_set_sampler_textures)(struct pipe_context *, unsigned,
 108                                        struct pipe_texture **);
 109
 110    struct pipe_context *pipe;
 111 };
 112
 113
 114
 115 /**
 116  * Subclass of tgsi_transform_context, used for transforming the
 117  * user's fragment shader to add the special AA instructions.
 118  */
 119 struct aa_transform_context {
 120    struct tgsi_transform_context base;
 121    uint tempsUsed;  /**< bitmask */
 122    int colorOutput; /**< which output is the primary color */
 123    uint samplersUsed;  /**< bitfield of samplers used */
 124    int freeSampler;  /** an available sampler for the pstipple */
 125    int maxInput, maxGeneric;  /**< max input index found */
 126    int colorTemp, texTemp;  /**< temp registers */
 127    boolean firstInstruction;
 128 };
 129
 130
 131 /**
 132  * TGSI declaration transform callback.
 133  * Look for a free sampler, a free input attrib, and two free temp regs.
 134  */
 135 static void
 136 aa_transform_decl(struct tgsi_transform_context *ctx,
 137                   struct tgsi_full_declaration *decl)
 138 {
 139    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 140
 141    if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
 142        decl->Semantic.SemanticName == TGSI_SEMANTIC_COLOR &&
 143        decl->Semantic.SemanticIndex == 0) {
 144       aactx->colorOutput = decl->DeclarationRange.First;
 145    }
 146    else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
 147       uint i;
 148       for (i = decl->DeclarationRange.First;
 149            i <= decl->DeclarationRange.Last; i++) {
 150          aactx->samplersUsed |= 1 << i;
 151       }
 152    }
 153    else if (decl->Declaration.File == TGSI_FILE_INPUT) {
 154       if ((int) decl->DeclarationRange.Last > aactx->maxInput)
 155          aactx->maxInput = decl->DeclarationRange.Last;
 156       if (decl->Semantic.SemanticName == TGSI_SEMANTIC_GENERIC &&
 157            (int) decl->Semantic.SemanticIndex > aactx->maxGeneric) {
 158          aactx->maxGeneric = decl->Semantic.SemanticIndex;
 159       }
 160    }
 161    else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
 162       uint i;
 163       for (i = decl->DeclarationRange.First;
 164            i <= decl->DeclarationRange.Last; i++) {
 165          aactx->tempsUsed |= (1 << i);
 166       }
 167    }
 168
 169    ctx->emit_declaration(ctx, decl);
 170 }
 171
 172
 173 /**
 174  * Find the lowest zero bit in the given word, or -1 if bitfield is all ones.
 175  */
 176 static int
 177 free_bit(uint bitfield)
 178 {
 179    int i;
 180    for (i = 0; i < 32; i++) {
 181       if ((bitfield & (1 << i)) == 0)
 182          return i;
 183    }
 184    return -1;
 185 }
 186
 187
 188 /**
 189  * TGSI instruction transform callback.
 190  * Replace writes to result.color w/ a temp reg.
 191  * Upon END instruction, insert texture sampling code for antialiasing.
 192  */
 193 static void
 194 aa_transform_inst(struct tgsi_transform_context *ctx,
 195                   struct tgsi_full_instruction *inst)
 196 {
 197    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 198
 199    if (aactx->firstInstruction) {
 200       /* emit our new declarations before the first instruction */
 201
 202       struct tgsi_full_declaration decl;
 203       uint i;
 204
 205       /* find free sampler */
 206       aactx->freeSampler = free_bit(aactx->samplersUsed);
 207       if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
 208          aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
 209
 210       /* find two free temp regs */
 211       for (i = 0; i < 32; i++) {
 212          if ((aactx->tempsUsed & (1 << i)) == 0) {
 213             /* found a free temp */
 214             if (aactx->colorTemp < 0)
 215                aactx->colorTemp  = i;
 216             else if (aactx->texTemp < 0)
 217                aactx->texTemp  = i;
 218             else
 219                break;
 220          }
 221       }
 222       assert(aactx->colorTemp >= 0);
 223       assert(aactx->texTemp >= 0);
 224
 225       /* declare new generic input/texcoord */
 226       decl = tgsi_default_full_declaration();
 227       decl.Declaration.File = TGSI_FILE_INPUT;
 228       /* XXX this could be linear... */
 229       decl.Declaration.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
 230       decl.Declaration.Semantic = 1;
 231       decl.Semantic.SemanticName = TGSI_SEMANTIC_GENERIC;
 232       decl.Semantic.SemanticIndex = aactx->maxGeneric + 1;
 233       decl.DeclarationRange.First =
 234       decl.DeclarationRange.Last = aactx->maxInput + 1;
 235       ctx->emit_declaration(ctx, &decl);
 236
 237       /* declare new sampler */
 238       decl = tgsi_default_full_declaration();
 239       decl.Declaration.File = TGSI_FILE_SAMPLER;
 240       decl.DeclarationRange.First =
 241       decl.DeclarationRange.Last = aactx->freeSampler;
 242       ctx->emit_declaration(ctx, &decl);
 243
 244       /* declare new temp regs */
 245       decl = tgsi_default_full_declaration();
 246       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 247       decl.DeclarationRange.First =
 248       decl.DeclarationRange.Last = aactx->texTemp;
 249       ctx->emit_declaration(ctx, &decl);
 250
 251       decl = tgsi_default_full_declaration();
 252       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 253       decl.DeclarationRange.First =
 254       decl.DeclarationRange.Last = aactx->colorTemp;
 255       ctx->emit_declaration(ctx, &decl);
 256
 257       aactx->firstInstruction = FALSE;
 258    }
 259
 260    if (inst->Instruction.Opcode == TGSI_OPCODE_END &&
 261        aactx->colorOutput != -1) {
 262       struct tgsi_full_instruction newInst;
 263
 264       /* TEX */
 265       newInst = tgsi_default_full_instruction();
 266       newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
 267       newInst.Instruction.NumDstRegs = 1;
 268       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
 269       newInst.FullDstRegisters[0].DstRegister.Index = aactx->texTemp;
 270       newInst.Instruction.NumSrcRegs = 2;
 271       newInst.InstructionExtTexture.Texture = TGSI_TEXTURE_2D;
 272       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_INPUT;
 273       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->maxInput + 1;
 274       newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_SAMPLER;
 275       newInst.FullSrcRegisters[1].SrcRegister.Index = aactx->freeSampler;
 276
 277       ctx->emit_instruction(ctx, &newInst);
 278
 279       /* MOV rgb */
 280       newInst = tgsi_default_full_instruction();
 281       newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
 282       newInst.Instruction.NumDstRegs = 1;
 283       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_OUTPUT;
 284       newInst.FullDstRegisters[0].DstRegister.Index = aactx->colorOutput;
 285       newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_XYZ;
 286       newInst.Instruction.NumSrcRegs = 1;
 287       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
 288       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->colorTemp;
 289       ctx->emit_instruction(ctx, &newInst);
 290
 291       /* MUL alpha */
 292       newInst = tgsi_default_full_instruction();
 293       newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
 294       newInst.Instruction.NumDstRegs = 1;
 295       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_OUTPUT;
 296       newInst.FullDstRegisters[0].DstRegister.Index = aactx->colorOutput;
 297       newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_W;
 298       newInst.Instruction.NumSrcRegs = 2;
 299       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
 300       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->colorTemp;
 301       newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_TEMPORARY;
 302       newInst.FullSrcRegisters[1].SrcRegister.Index = aactx->texTemp;
 303       ctx->emit_instruction(ctx, &newInst);
 304
 305       /* END */
 306       newInst = tgsi_default_full_instruction();
 307       newInst.Instruction.Opcode = TGSI_OPCODE_END;
 308       newInst.Instruction.NumDstRegs = 0;
 309       newInst.Instruction.NumSrcRegs = 0;
 310       ctx->emit_instruction(ctx, &newInst);
 311    }
 312    else {
 313       /* Not an END instruction.
 314        * Look for writes to result.color and replace with colorTemp reg.
 315        */
 316       uint i;
 317
 318       for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 319          struct tgsi_full_dst_register *dst = &inst->FullDstRegisters[i];
 320          if (dst->DstRegister.File == TGSI_FILE_OUTPUT &&
 321              dst->DstRegister.Index == aactx->colorOutput) {
 322             dst->DstRegister.File = TGSI_FILE_TEMPORARY;
 323             dst->DstRegister.Index = aactx->colorTemp;
 324          }
 325       }
 326
 327       ctx->emit_instruction(ctx, inst);
 328    }
 329 }
 330
 331
 332 /**
 333  * Generate the frag shader we'll use for drawing AA lines.
 334  * This will be the user's shader plus some texture/modulate instructions.
 335  */
 336 static boolean
 337 generate_aaline_fs(struct aaline_stage *aaline)
 338 {
 339    const struct pipe_shader_state *orig_fs = &aaline->fs->state;
 340    struct pipe_shader_state aaline_fs;
 341    struct aa_transform_context transform;
 342
 343 #define MAX 1000
 344
 345    aaline_fs = *orig_fs; /* copy to init */
 346    aaline_fs.tokens = MALLOC(sizeof(struct tgsi_token) * MAX);
 347    if (aaline_fs.tokens == NULL)
 348       return FALSE;
 349
 350    memset(&transform, 0, sizeof(transform));
 351    transform.colorOutput = -1;
 352    transform.maxInput = -1;
 353    transform.maxGeneric = -1;
 354    transform.colorTemp = -1;
 355    transform.texTemp = -1;
 356    transform.firstInstruction = TRUE;
 357    transform.base.transform_instruction = aa_transform_inst;
 358    transform.base.transform_declaration = aa_transform_decl;
 359
 360    tgsi_transform_shader(orig_fs->tokens,
 361                          (struct tgsi_token *) aaline_fs.tokens,
 362                          MAX, &transform.base);
 363
 364 #if 0 /* DEBUG */
 365    tgsi_dump(orig_fs->tokens, 0);
 366    tgsi_dump(aaline_fs.tokens, 0);
 367 #endif
 368
 369    aaline->fs->sampler_unit = transform.freeSampler;
 370
 371    aaline->fs->aaline_fs
 372       = aaline->driver_create_fs_state(aaline->pipe, &aaline_fs);
 373    if (aaline->fs->aaline_fs == NULL)
 374       goto fail;
 375
 376    aaline->fs->generic_attrib = transform.maxGeneric + 1;
 377    FREE((void *)aaline_fs.tokens);
 378    return TRUE;
 379
 380 fail:
 381    FREE((void *)aaline_fs.tokens);
 382    return FALSE;
 383 }
 384
 385
 386 /**
 387  * Create the texture map we'll use for antialiasing the lines.
 388  */
 389 static boolean
 390 aaline_create_texture(struct aaline_stage *aaline)
 391 {
 392    struct pipe_context *pipe = aaline->pipe;
 393    struct pipe_screen *screen = pipe->screen;
 394    struct pipe_texture texTemp;
 395    uint level;
 396
 397    memset(&texTemp, 0, sizeof(texTemp));
 398    texTemp.target = PIPE_TEXTURE_2D;
 399    texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
 400    texTemp.last_level = MAX_TEXTURE_LEVEL;
 401    texTemp.width0 = 1 << MAX_TEXTURE_LEVEL;
 402    texTemp.height0 = 1 << MAX_TEXTURE_LEVEL;
 403    texTemp.depth0 = 1;
 404    pf_get_block(texTemp.format, &texTemp.block);
 405
 406    aaline->texture = screen->texture_create(screen, &texTemp);
 407    if (!aaline->texture)
 408       return FALSE;
 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     */
 414    for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
 415       struct pipe_transfer *transfer;
 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       /* This texture is new, no need to flush.
 423        */
 424       transfer = screen->get_tex_transfer(screen, aaline->texture, 0, level, 0,
 425                                          PIPE_TRANSFER_WRITE, 0, 0, size, size);
 426       data = screen->transfer_map(screen, transfer);
 427       if (data == NULL)
 428          return FALSE;
 429
 430       for (i = 0; i < size; i++) {
 431          for (j = 0; j < size; j++) {
 432             ubyte d;
 433             if (size == 1) {
 434                d = 255;
 435             }
 436             else if (size == 2) {
 437                d = 200; /* tuneable */
 438             }
 439             else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
 440                d = 0;
 441             }
 442             else {
 443                d = 255;
 444             }
 445             data[i * transfer->stride + j] = d;
 446          }
 447       }
 448
 449       /* unmap */
 450       screen->transfer_unmap(screen, transfer);
 451       screen->tex_transfer_destroy(transfer);
 452    }
 453    return TRUE;
 454 }
 455
 456
 457 /**
 458  * Create the sampler CSO that'll be used for antialiasing.
 459  * By using a mipmapped texture, we don't have to generate a different
 460  * texture image for each line size.
 461  */
 462 static boolean
 463 aaline_create_sampler(struct aaline_stage *aaline)
 464 {
 465    struct pipe_sampler_state sampler;
 466    struct pipe_context *pipe = aaline->pipe;
 467
 468    memset(&sampler, 0, sizeof(sampler));
 469    sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 470    sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 471    sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 472    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
 473    sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
 474    sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
 475    sampler.normalized_coords = 1;
 476    sampler.min_lod = 0.0f;
 477    sampler.max_lod = MAX_TEXTURE_LEVEL;
 478
 479    aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 480    if (aaline->sampler_cso == NULL)
 481       return FALSE;
 482
 483    return TRUE;
 484 }
 485
 486
 487 /**
 488  * When we're about to draw our first AA line in a batch, this function is
 489  * called to tell the driver to bind our modified fragment shader.
 490  */
 491 static boolean
 492 bind_aaline_fragment_shader(struct aaline_stage *aaline)
 493 {
 494    struct draw_context *draw = aaline->stage.draw;
 495
 496    if (!aaline->fs->aaline_fs &&
 497        !generate_aaline_fs(aaline))
 498       return FALSE;
 499
 500    draw->suspend_flushing = TRUE;
 501    aaline->driver_bind_fs_state(aaline->pipe, aaline->fs->aaline_fs);
 502    draw->suspend_flushing = FALSE;
 503
 504    return TRUE;
 505 }
 506
 507
 508
 509 static INLINE struct aaline_stage *
 510 aaline_stage( struct draw_stage *stage )
 511 {
 512    return (struct aaline_stage *) stage;
 513 }
 514
 515
 516 /**
 517  * Draw a wide line by drawing a quad, using geometry which will
 518  * fullfill GL's antialiased line requirements.
 519  */
 520 static void
 521 aaline_line(struct draw_stage *stage, struct prim_header *header)
 522 {
 523    const struct aaline_stage *aaline = aaline_stage(stage);
 524    const float half_width = aaline->half_line_width;
 525    struct prim_header tri;
 526    struct vertex_header *v[8];
 527    uint texPos = aaline->tex_slot;
 528    uint posPos = aaline->pos_slot;
 529    float *pos, *tex;
 530    float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
 531    float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
 532    double a = atan2(dy, dx);
 533    float c_a = (float) cos(a), s_a = (float) sin(a);
 534    uint i;
 535
 536    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 537    dx = 0.5F * half_width;
 538    dy = half_width;
 539
 540    /* allocate/dup new verts */
 541    for (i = 0; i < 8; i++) {
 542       v[i] = dup_vert(stage, header->v[i/4], i);
 543    }
 544
 545    /*
 546     * Quad strip for line from v0 to v1 (*=endpoints):
 547     *
 548     *  1   3                     5   7
 549     *  +---+---------------------+---+
 550     *  |                             |
 551     *  | *v0                     v1* |
 552     *  |                             |
 553     *  +---+---------------------+---+
 554     *  0   2                     4   6
 555     */
 556
 557    /* new verts */
 558    pos = v[0]->data[posPos];
 559    pos[0] += (-dx * c_a -  dy * s_a);
 560    pos[1] += (-dx * s_a +  dy * c_a);
 561
 562    pos = v[1]->data[posPos];
 563    pos[0] += (-dx * c_a - -dy * s_a);
 564    pos[1] += (-dx * s_a + -dy * c_a);
 565
 566    pos = v[2]->data[posPos];
 567    pos[0] += ( dx * c_a -  dy * s_a);
 568    pos[1] += ( dx * s_a +  dy * c_a);
 569
 570    pos = v[3]->data[posPos];
 571    pos[0] += ( dx * c_a - -dy * s_a);
 572    pos[1] += ( dx * s_a + -dy * c_a);
 573
 574    pos = v[4]->data[posPos];
 575    pos[0] += (-dx * c_a -  dy * s_a);
 576    pos[1] += (-dx * s_a +  dy * c_a);
 577
 578    pos = v[5]->data[posPos];
 579    pos[0] += (-dx * c_a - -dy * s_a);
 580    pos[1] += (-dx * s_a + -dy * c_a);
 581
 582    pos = v[6]->data[posPos];
 583    pos[0] += ( dx * c_a -  dy * s_a);
 584    pos[1] += ( dx * s_a +  dy * c_a);
 585
 586    pos = v[7]->data[posPos];
 587    pos[0] += ( dx * c_a - -dy * s_a);
 588    pos[1] += ( dx * s_a + -dy * c_a);
 589
 590    /* new texcoords */
 591    tex = v[0]->data[texPos];
 592    ASSIGN_4V(tex, 0, 0, 0, 1);
 593
 594    tex = v[1]->data[texPos];
 595    ASSIGN_4V(tex, 0, 1, 0, 1);
 596
 597    tex = v[2]->data[texPos];
 598    ASSIGN_4V(tex, .5, 0, 0, 1);
 599
 600    tex = v[3]->data[texPos];
 601    ASSIGN_4V(tex, .5, 1, 0, 1);
 602
 603    tex = v[4]->data[texPos];
 604    ASSIGN_4V(tex, .5, 0, 0, 1);
 605
 606    tex = v[5]->data[texPos];
 607    ASSIGN_4V(tex, .5, 1, 0, 1);
 608
 609    tex = v[6]->data[texPos];
 610    ASSIGN_4V(tex, 1, 0, 0, 1);
 611
 612    tex = v[7]->data[texPos];
 613    ASSIGN_4V(tex, 1, 1, 0, 1);
 614
 615    /* emit 6 tris for the quad strip */
 616    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 617    stage->next->tri( stage->next, &tri );
 618
 619    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 620    stage->next->tri( stage->next, &tri );
 621
 622    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 623    stage->next->tri( stage->next, &tri );
 624
 625    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 626    stage->next->tri( stage->next, &tri );
 627
 628    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 629    stage->next->tri( stage->next, &tri );
 630
 631    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 632    stage->next->tri( stage->next, &tri );
 633 }
 634
 635
 636 static void
 637 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 638 {
 639    auto struct aaline_stage *aaline = aaline_stage(stage);
 640    struct draw_context *draw = stage->draw;
 641    struct pipe_context *pipe = aaline->pipe;
 642    uint num_samplers;
 643
 644    assert(draw->rasterizer->line_smooth);
 645
 646    if (draw->rasterizer->line_width <= 3.0)
 647       aaline->half_line_width = 1.5f;
 648    else
 649       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 650
 651    /*
 652     * Bind (generate) our fragprog, sampler and texture
 653     */
 654    if (!bind_aaline_fragment_shader(aaline)) {
 655       stage->line = draw_pipe_passthrough_line;
 656       stage->line(stage, header);
 657       return;
 658    }
 659
 660    /* update vertex attrib info */
 661    aaline->tex_slot = draw->vs.num_vs_outputs;
 662    aaline->pos_slot = draw->vs.position_output;
 663
 664    /* advertise the extra post-transformed vertex attribute */
 665    draw->extra_vp_outputs.semantic_name = TGSI_SEMANTIC_GENERIC;
 666    draw->extra_vp_outputs.semantic_index = aaline->fs->generic_attrib;
 667    draw->extra_vp_outputs.slot = aaline->tex_slot;
 668
 669    /* how many samplers? */
 670    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 671    num_samplers = MAX2(aaline->num_textures, aaline->num_samplers);
 672    num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
 673
 674    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 675    pipe_texture_reference(&aaline->state.texture[aaline->fs->sampler_unit],
 676                           aaline->texture);
 677
 678    draw->suspend_flushing = TRUE;
 679    aaline->driver_bind_sampler_states(pipe, num_samplers, aaline->state.sampler);
 680    aaline->driver_set_sampler_textures(pipe, num_samplers, aaline->state.texture);
 681    draw->suspend_flushing = FALSE;
 682
 683    /* now really draw first line */
 684    stage->line = aaline_line;
 685    stage->line(stage, header);
 686 }
 687
 688
 689 static void
 690 aaline_flush(struct draw_stage *stage, unsigned flags)
 691 {
 692    struct draw_context *draw = stage->draw;
 693    struct aaline_stage *aaline = aaline_stage(stage);
 694    struct pipe_context *pipe = aaline->pipe;
 695
 696    stage->line = aaline_first_line;
 697    stage->next->flush( stage->next, flags );
 698
 699    /* restore original frag shader, texture, sampler state */
 700    draw->suspend_flushing = TRUE;
 701    aaline->driver_bind_fs_state(pipe, aaline->fs->driver_fs);
 702    aaline->driver_bind_sampler_states(pipe, aaline->num_samplers,
 703                                       aaline->state.sampler);
 704    aaline->driver_set_sampler_textures(pipe, aaline->num_textures,
 705                                        aaline->state.texture);
 706    draw->suspend_flushing = FALSE;
 707
 708    draw->extra_vp_outputs.slot = 0;
 709 }
 710
 711
 712 static void
 713 aaline_reset_stipple_counter(struct draw_stage *stage)
 714 {
 715    stage->next->reset_stipple_counter( stage->next );
 716 }
 717
 718
 719 static void
 720 aaline_destroy(struct draw_stage *stage)
 721 {
 722    struct aaline_stage *aaline = aaline_stage(stage);
 723    uint i;
 724
 725    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 726       pipe_texture_reference(&aaline->state.texture[i], NULL);
 727    }
 728
 729    if (aaline->sampler_cso)
 730       aaline->pipe->delete_sampler_state(aaline->pipe, aaline->sampler_cso);
 731
 732    if (aaline->texture)
 733       pipe_texture_reference(&aaline->texture, NULL);
 734
 735    draw_free_temp_verts( stage );
 736
 737    FREE( stage );
 738 }
 739
 740
 741 static struct aaline_stage *
 742 draw_aaline_stage(struct draw_context *draw)
 743 {
 744    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 745    if (aaline == NULL)
 746       return NULL;
 747
 748    if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
 749       goto fail;
 750
 751    aaline->stage.draw = draw;
 752    aaline->stage.name = "aaline";
 753    aaline->stage.next = NULL;
 754    aaline->stage.point = draw_pipe_passthrough_point;
 755    aaline->stage.line = aaline_first_line;
 756    aaline->stage.tri = draw_pipe_passthrough_tri;
 757    aaline->stage.flush = aaline_flush;
 758    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 759    aaline->stage.destroy = aaline_destroy;
 760
 761    return aaline;
 762
 763  fail:
 764    if (aaline)
 765       aaline_destroy(&aaline->stage);
 766
 767    return NULL;
 768 }
 769
 770
 771 static struct aaline_stage *
 772 aaline_stage_from_pipe(struct pipe_context *pipe)
 773 {
 774    struct draw_context *draw = (struct draw_context *) pipe->draw;
 775    return aaline_stage(draw->pipeline.aaline);
 776 }
 777
 778
 779 /**
 780  * This function overrides the driver's create_fs_state() function and
 781  * will typically be called by the state tracker.
 782  */
 783 static void *
 784 aaline_create_fs_state(struct pipe_context *pipe,
 785                        const struct pipe_shader_state *fs)
 786 {
 787    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 788    struct aaline_fragment_shader *aafs = CALLOC_STRUCT(aaline_fragment_shader);
 789    if (aafs == NULL)
 790       return NULL;
 791
 792    aafs->state = *fs;
 793
 794    /* pass-through */
 795    aafs->driver_fs = aaline->driver_create_fs_state(aaline->pipe, fs);
 796
 797    return aafs;
 798 }
 799
 800
 801 static void
 802 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 803 {
 804    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 805    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 806
 807    /* save current */
 808    aaline->fs = aafs;
 809    /* pass-through */
 810    aaline->driver_bind_fs_state(aaline->pipe,
 811                                 (aafs ? aafs->driver_fs : NULL));
 812 }
 813
 814
 815 static void
 816 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 817 {
 818    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 819    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 820    /* pass-through */
 821    aaline->driver_delete_fs_state(aaline->pipe, aafs->driver_fs);
 822
 823    if (aafs->aaline_fs)
 824       aaline->driver_delete_fs_state(aaline->pipe, aafs->aaline_fs);
 825
 826    FREE(aafs);
 827 }
 828
 829
 830 static void
 831 aaline_bind_sampler_states(struct pipe_context *pipe,
 832                            unsigned num, void **sampler)
 833 {
 834    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 835
 836    /* save current */
 837    memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 838    aaline->num_samplers = num;
 839
 840    /* pass-through */
 841    aaline->driver_bind_sampler_states(aaline->pipe, num, sampler);
 842 }
 843
 844
 845 static void
 846 aaline_set_sampler_textures(struct pipe_context *pipe,
 847                             unsigned num, struct pipe_texture **texture)
 848 {
 849    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 850    uint i;
 851
 852    /* save current */
 853    for (i = 0; i < num; i++) {
 854       pipe_texture_reference(&aaline->state.texture[i], texture[i]);
 855    }
 856    for ( ; i < PIPE_MAX_SAMPLERS; i++) {
 857       pipe_texture_reference(&aaline->state.texture[i], NULL);
 858    }
 859    aaline->num_textures = num;
 860
 861    /* pass-through */
 862    aaline->driver_set_sampler_textures(aaline->pipe, num, texture);
 863 }
 864
 865
 866 /**
 867  * Called by drivers that want to install this AA line prim stage
 868  * into the draw module's pipeline.  This will not be used if the
 869  * hardware has native support for AA lines.
 870  */
 871 boolean
 872 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 873 {
 874    struct aaline_stage *aaline;
 875
 876    pipe->draw = (void *) draw;
 877
 878    /*
 879     * Create / install AA line drawing / prim stage
 880     */
 881    aaline = draw_aaline_stage( draw );
 882    if (!aaline)
 883       goto fail;
 884
 885    aaline->pipe = pipe;
 886
 887    /* create special texture, sampler state */
 888    if (!aaline_create_texture(aaline))
 889       goto fail;
 890
 891    if (!aaline_create_sampler(aaline))
 892       goto fail;
 893
 894    /* save original driver functions */
 895    aaline->driver_create_fs_state = pipe->create_fs_state;
 896    aaline->driver_bind_fs_state = pipe->bind_fs_state;
 897    aaline->driver_delete_fs_state = pipe->delete_fs_state;
 898
 899    aaline->driver_bind_sampler_states = pipe->bind_sampler_states;
 900    aaline->driver_set_sampler_textures = pipe->set_sampler_textures;
 901
 902    /* override the driver's functions */
 903    pipe->create_fs_state = aaline_create_fs_state;
 904    pipe->bind_fs_state = aaline_bind_fs_state;
 905    pipe->delete_fs_state = aaline_delete_fs_state;
 906
 907    pipe->bind_sampler_states = aaline_bind_sampler_states;
 908    pipe->set_sampler_textures = aaline_set_sampler_textures;
 909
 910    /* Install once everything is known to be OK:
 911     */
 912    draw->pipeline.aaline = &aaline->stage;
 913
 914    return TRUE;
 915
 916  fail:
 917    if (aaline)
 918       aaline->stage.destroy( &aaline->stage );
 919
 920    return FALSE;
 921 }