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_util.h"
  36 #include "pipe/p_inlines.h"
  37 #include "pipe/p_context.h"
  38 #include "pipe/p_defines.h"
  39 #include "pipe/p_shader_tokens.h"
  40
  41 #include "tgsi/util/tgsi_transform.h"
  42 #include "tgsi/util/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    void *aapoint_fs; /* not yet */
  64    void *sprite_fs; /* not yet */
  65    uint sampler_unit;
  66    int generic_attrib;  /**< texcoord/generic used for texture */
  67 };
  68
  69
  70 /**
  71  * Subclass of draw_stage
  72  */
  73 struct aaline_stage
  74 {
  75    struct draw_stage stage;
  76
  77    float half_line_width;
  78
  79    /** For AA lines, this is the vertex attrib slot for the new texcoords */
  80    uint tex_slot;
  81    /** position, not necessarily output zero */
  82    uint pos_slot;
  83
  84    void *sampler_cso;
  85    struct pipe_texture *texture;
  86    uint num_samplers;
  87    uint num_textures;
  88
  89
  90    /*
  91     * Currently bound state
  92     */
  93    struct aaline_fragment_shader *fs;
  94    struct {
  95       void *sampler[PIPE_MAX_SAMPLERS];
  96       struct pipe_texture *texture[PIPE_MAX_SAMPLERS];
  97    } state;
  98
  99    /*
 100     * Driver interface/override functions
 101     */
 102    void * (*driver_create_fs_state)(struct pipe_context *,
 103                                     const struct pipe_shader_state *);
 104    void (*driver_bind_fs_state)(struct pipe_context *, void *);
 105    void (*driver_delete_fs_state)(struct pipe_context *, void *);
 106
 107    void (*driver_bind_sampler_states)(struct pipe_context *, unsigned,
 108                                       void **);
 109    void (*driver_set_sampler_textures)(struct pipe_context *, unsigned,
 110                                        struct pipe_texture **);
 111
 112    struct pipe_context *pipe;
 113 };
 114
 115
 116
 117 /**
 118  * Subclass of tgsi_transform_context, used for transforming the
 119  * user's fragment shader to add the special AA instructions.
 120  */
 121 struct aa_transform_context {
 122    struct tgsi_transform_context base;
 123    uint tempsUsed;  /**< bitmask */
 124    int colorOutput; /**< which output is the primary color */
 125    uint samplersUsed;  /**< bitfield of samplers used */
 126    int freeSampler;  /** an available sampler for the pstipple */
 127    int maxInput, maxGeneric;  /**< max input index found */
 128    int colorTemp, texTemp;  /**< temp registers */
 129    boolean firstInstruction;
 130 };
 131
 132
 133 /**
 134  * TGSI declaration transform callback.
 135  * Look for a free sampler, a free input attrib, and two free temp regs.
 136  */
 137 static void
 138 aa_transform_decl(struct tgsi_transform_context *ctx,
 139                   struct tgsi_full_declaration *decl)
 140 {
 141    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 142
 143    if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
 144        decl->Semantic.SemanticName == TGSI_SEMANTIC_COLOR &&
 145        decl->Semantic.SemanticIndex == 0) {
 146       aactx->colorOutput = decl->DeclarationRange.First;
 147    }
 148    else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
 149       uint i;
 150       for (i = decl->DeclarationRange.First;
 151            i <= decl->DeclarationRange.Last; i++) {
 152          aactx->samplersUsed |= 1 << i;
 153       }
 154    }
 155    else if (decl->Declaration.File == TGSI_FILE_INPUT) {
 156       if ((int) decl->DeclarationRange.Last > aactx->maxInput)
 157          aactx->maxInput = decl->DeclarationRange.Last;
 158       if (decl->Semantic.SemanticName == TGSI_SEMANTIC_GENERIC &&
 159            (int) decl->Semantic.SemanticIndex > aactx->maxGeneric) {
 160          aactx->maxGeneric = decl->Semantic.SemanticIndex;
 161       }
 162    }
 163    else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
 164       uint i;
 165       for (i = decl->DeclarationRange.First;
 166            i <= decl->DeclarationRange.Last; i++) {
 167          aactx->tempsUsed |= (1 << i);
 168       }
 169    }
 170
 171    ctx->emit_declaration(ctx, decl);
 172 }
 173
 174
 175 /**
 176  * Find the lowest zero bit in the given word, or -1 if bitfield is all ones.
 177  */
 178 static int
 179 free_bit(uint bitfield)
 180 {
 181    int i;
 182    for (i = 0; i < 32; i++) {
 183       if ((bitfield & (1 << i)) == 0)
 184          return i;
 185    }
 186    return -1;
 187 }
 188
 189
 190 /**
 191  * TGSI instruction transform callback.
 192  * Replace writes to result.color w/ a temp reg.
 193  * Upon END instruction, insert texture sampling code for antialiasing.
 194  */
 195 static void
 196 aa_transform_inst(struct tgsi_transform_context *ctx,
 197                   struct tgsi_full_instruction *inst)
 198 {
 199    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 200
 201    if (aactx->firstInstruction) {
 202       /* emit our new declarations before the first instruction */
 203
 204       struct tgsi_full_declaration decl;
 205       uint i;
 206
 207       /* find free sampler */
 208       aactx->freeSampler = free_bit(aactx->samplersUsed);
 209       if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
 210          aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
 211
 212       /* find two free temp regs */
 213       for (i = 0; i < 32; i++) {
 214          if ((aactx->tempsUsed & (1 << i)) == 0) {
 215             /* found a free temp */
 216             if (aactx->colorTemp < 0)
 217                aactx->colorTemp  = i;
 218             else if (aactx->texTemp < 0)
 219                aactx->texTemp  = i;
 220             else
 221                break;
 222          }
 223       }
 224       assert(aactx->colorTemp >= 0);
 225       assert(aactx->texTemp >= 0);
 226
 227       /* declare new generic input/texcoord */
 228       decl = tgsi_default_full_declaration();
 229       decl.Declaration.File = TGSI_FILE_INPUT;
 230       /* XXX this could be linear... */
 231       decl.Declaration.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
 232       decl.Declaration.Semantic = 1;
 233       decl.Semantic.SemanticName = TGSI_SEMANTIC_GENERIC;
 234       decl.Semantic.SemanticIndex = aactx->maxGeneric + 1;
 235       decl.DeclarationRange.First =
 236       decl.DeclarationRange.Last = aactx->maxInput + 1;
 237       ctx->emit_declaration(ctx, &decl);
 238
 239       /* declare new sampler */
 240       decl = tgsi_default_full_declaration();
 241       decl.Declaration.File = TGSI_FILE_SAMPLER;
 242       decl.DeclarationRange.First =
 243       decl.DeclarationRange.Last = aactx->freeSampler;
 244       ctx->emit_declaration(ctx, &decl);
 245
 246       /* declare new temp regs */
 247       decl = tgsi_default_full_declaration();
 248       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 249       decl.DeclarationRange.First =
 250       decl.DeclarationRange.Last = aactx->texTemp;
 251       ctx->emit_declaration(ctx, &decl);
 252
 253       decl = tgsi_default_full_declaration();
 254       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 255       decl.DeclarationRange.First =
 256       decl.DeclarationRange.Last = aactx->colorTemp;
 257       ctx->emit_declaration(ctx, &decl);
 258
 259       aactx->firstInstruction = FALSE;
 260    }
 261
 262    if (inst->Instruction.Opcode == TGSI_OPCODE_END &&
 263        aactx->colorOutput != -1) {
 264       struct tgsi_full_instruction newInst;
 265
 266       /* TEX */
 267       newInst = tgsi_default_full_instruction();
 268       newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
 269       newInst.Instruction.NumDstRegs = 1;
 270       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
 271       newInst.FullDstRegisters[0].DstRegister.Index = aactx->texTemp;
 272       newInst.Instruction.NumSrcRegs = 2;
 273       newInst.InstructionExtTexture.Texture = TGSI_TEXTURE_2D;
 274       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_INPUT;
 275       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->maxInput + 1;
 276       newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_SAMPLER;
 277       newInst.FullSrcRegisters[1].SrcRegister.Index = aactx->freeSampler;
 278
 279       ctx->emit_instruction(ctx, &newInst);
 280
 281       /* MOV rgb */
 282       newInst = tgsi_default_full_instruction();
 283       newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
 284       newInst.Instruction.NumDstRegs = 1;
 285       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_OUTPUT;
 286       newInst.FullDstRegisters[0].DstRegister.Index = aactx->colorOutput;
 287       newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_XYZ;
 288       newInst.Instruction.NumSrcRegs = 1;
 289       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
 290       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->colorTemp;
 291       ctx->emit_instruction(ctx, &newInst);
 292
 293       /* MUL alpha */
 294       newInst = tgsi_default_full_instruction();
 295       newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
 296       newInst.Instruction.NumDstRegs = 1;
 297       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_OUTPUT;
 298       newInst.FullDstRegisters[0].DstRegister.Index = aactx->colorOutput;
 299       newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_W;
 300       newInst.Instruction.NumSrcRegs = 2;
 301       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
 302       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->colorTemp;
 303       newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_TEMPORARY;
 304       newInst.FullSrcRegisters[1].SrcRegister.Index = aactx->texTemp;
 305       ctx->emit_instruction(ctx, &newInst);
 306
 307       /* END */
 308       newInst = tgsi_default_full_instruction();
 309       newInst.Instruction.Opcode = TGSI_OPCODE_END;
 310       newInst.Instruction.NumDstRegs = 0;
 311       newInst.Instruction.NumSrcRegs = 0;
 312       ctx->emit_instruction(ctx, &newInst);
 313    }
 314    else {
 315       /* Not an END instruction.
 316        * Look for writes to result.color and replace with colorTemp reg.
 317        */
 318       uint i;
 319
 320       for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 321          struct tgsi_full_dst_register *dst = &inst->FullDstRegisters[i];
 322          if (dst->DstRegister.File == TGSI_FILE_OUTPUT &&
 323              dst->DstRegister.Index == aactx->colorOutput) {
 324             dst->DstRegister.File = TGSI_FILE_TEMPORARY;
 325             dst->DstRegister.Index = aactx->colorTemp;
 326          }
 327       }
 328
 329       ctx->emit_instruction(ctx, inst);
 330    }
 331 }
 332
 333
 334 /**
 335  * Generate the frag shader we'll use for drawing AA lines.
 336  * This will be the user's shader plus some texture/modulate instructions.
 337  */
 338 static boolean
 339 generate_aaline_fs(struct aaline_stage *aaline)
 340 {
 341    const struct pipe_shader_state *orig_fs = &aaline->fs->state;
 342    struct pipe_shader_state aaline_fs;
 343    struct aa_transform_context transform;
 344
 345 #define MAX 1000
 346
 347    aaline_fs = *orig_fs; /* copy to init */
 348    aaline_fs.tokens = MALLOC(sizeof(struct tgsi_token) * MAX);
 349    if (aaline_fs.tokens == NULL)
 350       return FALSE;
 351
 352    memset(&transform, 0, sizeof(transform));
 353    transform.colorOutput = -1;
 354    transform.maxInput = -1;
 355    transform.maxGeneric = -1;
 356    transform.colorTemp = -1;
 357    transform.texTemp = -1;
 358    transform.firstInstruction = TRUE;
 359    transform.base.transform_instruction = aa_transform_inst;
 360    transform.base.transform_declaration = aa_transform_decl;
 361
 362    tgsi_transform_shader(orig_fs->tokens,
 363                          (struct tgsi_token *) aaline_fs.tokens,
 364                          MAX, &transform.base);
 365
 366 #if 0 /* DEBUG */
 367    tgsi_dump(orig_fs->tokens, 0);
 368    tgsi_dump(aaline_fs.tokens, 0);
 369 #endif
 370
 371    aaline->fs->sampler_unit = transform.freeSampler;
 372
 373    aaline->fs->aaline_fs
 374       = aaline->driver_create_fs_state(aaline->pipe, &aaline_fs);
 375    if (aaline->fs->aaline_fs == NULL)
 376       return FALSE;
 377
 378    aaline->fs->generic_attrib = transform.maxGeneric + 1;
 379    return TRUE;
 380 }
 381
 382
 383 /**
 384  * Create the texture map we'll use for antialiasing the lines.
 385  */
 386 static boolean
 387 aaline_create_texture(struct aaline_stage *aaline)
 388 {
 389    struct pipe_context *pipe = aaline->pipe;
 390    struct pipe_screen *screen = pipe->screen;
 391    struct pipe_texture texTemp;
 392    uint level;
 393
 394    memset(&texTemp, 0, sizeof(texTemp));
 395    texTemp.target = PIPE_TEXTURE_2D;
 396    texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
 397    texTemp.last_level = MAX_TEXTURE_LEVEL;
 398    texTemp.width[0] = 1 << MAX_TEXTURE_LEVEL;
 399    texTemp.height[0] = 1 << MAX_TEXTURE_LEVEL;
 400    texTemp.depth[0] = 1;
 401    pf_get_block(texTemp.format, &texTemp.block);
 402
 403    aaline->texture = screen->texture_create(screen, &texTemp);
 404    if (!aaline->texture)
 405       return FALSE;
 406
 407    /* Fill in mipmap images.
 408     * Basically each level is solid opaque, except for the outermost
 409     * texels which are zero.  Special case the 1x1 and 2x2 levels.
 410     */
 411    for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
 412       struct pipe_surface *surface;
 413       const uint size = aaline->texture->width[level];
 414       ubyte *data;
 415       uint i, j;
 416
 417       assert(aaline->texture->width[level] == aaline->texture->height[level]);
 418
 419       /* This texture is new, no need to flush.
 420        */
 421       surface = screen->get_tex_surface(screen, aaline->texture, 0, level, 0,
 422                                         PIPE_BUFFER_USAGE_CPU_WRITE);
 423       data = screen->surface_map(screen, surface, PIPE_BUFFER_USAGE_CPU_WRITE);
 424       if (data == NULL)
 425          return FALSE;
 426
 427       for (i = 0; i < size; i++) {
 428          for (j = 0; j < size; j++) {
 429             ubyte d;
 430             if (size == 1) {
 431                d = 255;
 432             }
 433             else if (size == 2) {
 434                d = 200; /* tuneable */
 435             }
 436             else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
 437                d = 0;
 438             }
 439             else {
 440                d = 255;
 441             }
 442             data[i * surface->stride + j] = d;
 443          }
 444       }
 445
 446       /* unmap */
 447       screen->surface_unmap(screen, surface);
 448       screen->tex_surface_release(screen, &surface);
 449    }
 450    return TRUE;
 451 }
 452
 453
 454 /**
 455  * Create the sampler CSO that'll be used for antialiasing.
 456  * By using a mipmapped texture, we don't have to generate a different
 457  * texture image for each line size.
 458  */
 459 static boolean
 460 aaline_create_sampler(struct aaline_stage *aaline)
 461 {
 462    struct pipe_sampler_state sampler;
 463    struct pipe_context *pipe = aaline->pipe;
 464
 465    memset(&sampler, 0, sizeof(sampler));
 466    sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 467    sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 468    sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 469    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
 470    sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
 471    sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
 472    sampler.normalized_coords = 1;
 473    sampler.min_lod = 0.0f;
 474    sampler.max_lod = MAX_TEXTURE_LEVEL;
 475
 476    aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 477    if (aaline->sampler_cso == NULL)
 478       return FALSE;
 479
 480    return TRUE;
 481 }
 482
 483
 484 /**
 485  * When we're about to draw our first AA line in a batch, this function is
 486  * called to tell the driver to bind our modified fragment shader.
 487  */
 488 static boolean
 489 bind_aaline_fragment_shader(struct aaline_stage *aaline)
 490 {
 491    struct draw_context *draw = aaline->stage.draw;
 492
 493    if (!aaline->fs->aaline_fs &&
 494        !generate_aaline_fs(aaline))
 495       return FALSE;
 496
 497    draw->suspend_flushing = TRUE;
 498    aaline->driver_bind_fs_state(aaline->pipe, aaline->fs->aaline_fs);
 499    draw->suspend_flushing = FALSE;
 500
 501    return TRUE;
 502 }
 503
 504
 505
 506 static INLINE struct aaline_stage *
 507 aaline_stage( struct draw_stage *stage )
 508 {
 509    return (struct aaline_stage *) stage;
 510 }
 511
 512
 513 /**
 514  * Draw a wide line by drawing a quad, using geometry which will
 515  * fullfill GL's antialiased line requirements.
 516  */
 517 static void
 518 aaline_line(struct draw_stage *stage, struct prim_header *header)
 519 {
 520    const struct aaline_stage *aaline = aaline_stage(stage);
 521    const float half_width = aaline->half_line_width;
 522    struct prim_header tri;
 523    struct vertex_header *v[8];
 524    uint texPos = aaline->tex_slot;
 525    uint posPos = aaline->pos_slot;
 526    float *pos, *tex;
 527    float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
 528    float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
 529    double a = atan2(dy, dx);
 530    float c_a = (float) cos(a), s_a = (float) sin(a);
 531    uint i;
 532
 533    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 534    dx = 0.5F * half_width;
 535    dy = half_width;
 536
 537    /* allocate/dup new verts */
 538    for (i = 0; i < 8; i++) {
 539       v[i] = dup_vert(stage, header->v[i/4], i);
 540    }
 541
 542    /*
 543     * Quad strip for line from v0 to v1 (*=endpoints):
 544     *
 545     *  1   3                     5   7
 546     *  +---+---------------------+---+
 547     *  |                             |
 548     *  | *v0                     v1* |
 549     *  |                             |
 550     *  +---+---------------------+---+
 551     *  0   2                     4   6
 552     */
 553
 554    /* new verts */
 555    pos = v[0]->data[posPos];
 556    pos[0] += (-dx * c_a -  dy * s_a);
 557    pos[1] += (-dx * s_a +  dy * c_a);
 558
 559    pos = v[1]->data[posPos];
 560    pos[0] += (-dx * c_a - -dy * s_a);
 561    pos[1] += (-dx * s_a + -dy * c_a);
 562
 563    pos = v[2]->data[posPos];
 564    pos[0] += ( dx * c_a -  dy * s_a);
 565    pos[1] += ( dx * s_a +  dy * c_a);
 566
 567    pos = v[3]->data[posPos];
 568    pos[0] += ( dx * c_a - -dy * s_a);
 569    pos[1] += ( dx * s_a + -dy * c_a);
 570
 571    pos = v[4]->data[posPos];
 572    pos[0] += (-dx * c_a -  dy * s_a);
 573    pos[1] += (-dx * s_a +  dy * c_a);
 574
 575    pos = v[5]->data[posPos];
 576    pos[0] += (-dx * c_a - -dy * s_a);
 577    pos[1] += (-dx * s_a + -dy * c_a);
 578
 579    pos = v[6]->data[posPos];
 580    pos[0] += ( dx * c_a -  dy * s_a);
 581    pos[1] += ( dx * s_a +  dy * c_a);
 582
 583    pos = v[7]->data[posPos];
 584    pos[0] += ( dx * c_a - -dy * s_a);
 585    pos[1] += ( dx * s_a + -dy * c_a);
 586
 587    /* new texcoords */
 588    tex = v[0]->data[texPos];
 589    ASSIGN_4V(tex, 0, 0, 0, 1);
 590
 591    tex = v[1]->data[texPos];
 592    ASSIGN_4V(tex, 0, 1, 0, 1);
 593
 594    tex = v[2]->data[texPos];
 595    ASSIGN_4V(tex, .5, 0, 0, 1);
 596
 597    tex = v[3]->data[texPos];
 598    ASSIGN_4V(tex, .5, 1, 0, 1);
 599
 600    tex = v[4]->data[texPos];
 601    ASSIGN_4V(tex, .5, 0, 0, 1);
 602
 603    tex = v[5]->data[texPos];
 604    ASSIGN_4V(tex, .5, 1, 0, 1);
 605
 606    tex = v[6]->data[texPos];
 607    ASSIGN_4V(tex, 1, 0, 0, 1);
 608
 609    tex = v[7]->data[texPos];
 610    ASSIGN_4V(tex, 1, 1, 0, 1);
 611
 612    /* emit 6 tris for the quad strip */
 613    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 614    stage->next->tri( stage->next, &tri );
 615
 616    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 617    stage->next->tri( stage->next, &tri );
 618
 619    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 620    stage->next->tri( stage->next, &tri );
 621
 622    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 623    stage->next->tri( stage->next, &tri );
 624
 625    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 626    stage->next->tri( stage->next, &tri );
 627
 628    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 629    stage->next->tri( stage->next, &tri );
 630 }
 631
 632
 633 static void
 634 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 635 {
 636    auto struct aaline_stage *aaline = aaline_stage(stage);
 637    struct draw_context *draw = stage->draw;
 638    struct pipe_context *pipe = aaline->pipe;
 639    uint num_samplers;
 640
 641    assert(draw->rasterizer->line_smooth);
 642
 643    if (draw->rasterizer->line_width <= 3.0)
 644       aaline->half_line_width = 1.5f;
 645    else
 646       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 647
 648    /*
 649     * Bind (generate) our fragprog, sampler and texture
 650     */
 651    if (!bind_aaline_fragment_shader(aaline)) {
 652       stage->line = draw_pipe_passthrough_line;
 653       stage->line(stage, header);
 654       return;
 655    }
 656
 657    /* update vertex attrib info */
 658    aaline->tex_slot = draw->vs.num_vs_outputs;
 659    aaline->pos_slot = draw->vs.position_output;
 660
 661    /* advertise the extra post-transformed vertex attribute */
 662    draw->extra_vp_outputs.semantic_name = TGSI_SEMANTIC_GENERIC;
 663    draw->extra_vp_outputs.semantic_index = aaline->fs->generic_attrib;
 664    draw->extra_vp_outputs.slot = aaline->tex_slot;
 665
 666    /* how many samplers? */
 667    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 668    num_samplers = MAX2(aaline->num_textures, aaline->num_samplers);
 669    num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
 670
 671    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 672    pipe_texture_reference(&aaline->state.texture[aaline->fs->sampler_unit],
 673                           aaline->texture);
 674
 675    draw->suspend_flushing = TRUE;
 676    aaline->driver_bind_sampler_states(pipe, num_samplers, aaline->state.sampler);
 677    aaline->driver_set_sampler_textures(pipe, num_samplers, aaline->state.texture);
 678    draw->suspend_flushing = FALSE;
 679
 680    /* now really draw first line */
 681    stage->line = aaline_line;
 682    stage->line(stage, header);
 683 }
 684
 685
 686 static void
 687 aaline_flush(struct draw_stage *stage, unsigned flags)
 688 {
 689    struct draw_context *draw = stage->draw;
 690    struct aaline_stage *aaline = aaline_stage(stage);
 691    struct pipe_context *pipe = aaline->pipe;
 692
 693    stage->line = aaline_first_line;
 694    stage->next->flush( stage->next, flags );
 695
 696    /* restore original frag shader, texture, sampler state */
 697    draw->suspend_flushing = TRUE;
 698    aaline->driver_bind_fs_state(pipe, aaline->fs->driver_fs);
 699    aaline->driver_bind_sampler_states(pipe, aaline->num_samplers,
 700                                       aaline->state.sampler);
 701    aaline->driver_set_sampler_textures(pipe, aaline->num_textures,
 702                                        aaline->state.texture);
 703    draw->suspend_flushing = FALSE;
 704
 705    draw->extra_vp_outputs.slot = 0;
 706 }
 707
 708
 709 static void
 710 aaline_reset_stipple_counter(struct draw_stage *stage)
 711 {
 712    stage->next->reset_stipple_counter( stage->next );
 713 }
 714
 715
 716 static void
 717 aaline_destroy(struct draw_stage *stage)
 718 {
 719    struct aaline_stage *aaline = aaline_stage(stage);
 720    uint i;
 721
 722    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 723       pipe_texture_reference(&aaline->state.texture[i], NULL);
 724    }
 725
 726    if (aaline->sampler_cso)
 727       aaline->pipe->delete_sampler_state(aaline->pipe, aaline->sampler_cso);
 728
 729    if (aaline->texture)
 730       pipe_texture_release(&aaline->texture);
 731
 732    draw_free_temp_verts( stage );
 733
 734    FREE( stage );
 735 }
 736
 737
 738 static struct aaline_stage *
 739 draw_aaline_stage(struct draw_context *draw)
 740 {
 741    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 742    if (aaline == NULL)
 743       return NULL;
 744
 745    if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
 746       goto fail;
 747
 748    aaline->stage.draw = draw;
 749    aaline->stage.next = NULL;
 750    aaline->stage.point = draw_pipe_passthrough_point;
 751    aaline->stage.line = aaline_first_line;
 752    aaline->stage.tri = draw_pipe_passthrough_tri;
 753    aaline->stage.flush = aaline_flush;
 754    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 755    aaline->stage.destroy = aaline_destroy;
 756
 757    return aaline;
 758
 759  fail:
 760    if (aaline)
 761       aaline_destroy(&aaline->stage);
 762
 763    return NULL;
 764 }
 765
 766
 767 static struct aaline_stage *
 768 aaline_stage_from_pipe(struct pipe_context *pipe)
 769 {
 770    struct draw_context *draw = (struct draw_context *) pipe->draw;
 771    return aaline_stage(draw->pipeline.aaline);
 772 }
 773
 774
 775 /**
 776  * This function overrides the driver's create_fs_state() function and
 777  * will typically be called by the state tracker.
 778  */
 779 static void *
 780 aaline_create_fs_state(struct pipe_context *pipe,
 781                        const struct pipe_shader_state *fs)
 782 {
 783    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 784    struct aaline_fragment_shader *aafs = CALLOC_STRUCT(aaline_fragment_shader);
 785    if (aafs == NULL)
 786       return NULL;
 787
 788    aafs->state = *fs;
 789
 790    /* pass-through */
 791    aafs->driver_fs = aaline->driver_create_fs_state(aaline->pipe, fs);
 792
 793    return aafs;
 794 }
 795
 796
 797 static void
 798 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 799 {
 800    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 801    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 802
 803    /* save current */
 804    aaline->fs = aafs;
 805    /* pass-through */
 806    aaline->driver_bind_fs_state(aaline->pipe,
 807                                 (aafs ? aafs->driver_fs : NULL));
 808 }
 809
 810
 811 static void
 812 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 813 {
 814    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 815    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 816    /* pass-through */
 817    aaline->driver_delete_fs_state(aaline->pipe, aafs->driver_fs);
 818    FREE(aafs);
 819 }
 820
 821
 822 static void
 823 aaline_bind_sampler_states(struct pipe_context *pipe,
 824                            unsigned num, void **sampler)
 825 {
 826    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 827
 828    /* save current */
 829    memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 830    aaline->num_samplers = num;
 831
 832    /* pass-through */
 833    aaline->driver_bind_sampler_states(aaline->pipe, num, sampler);
 834 }
 835
 836
 837 static void
 838 aaline_set_sampler_textures(struct pipe_context *pipe,
 839                             unsigned num, struct pipe_texture **texture)
 840 {
 841    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 842    uint i;
 843
 844    /* save current */
 845    for (i = 0; i < num; i++) {
 846       pipe_texture_reference(&aaline->state.texture[i], texture[i]);
 847    }
 848    for ( ; i < PIPE_MAX_SAMPLERS; i++) {
 849       pipe_texture_reference(&aaline->state.texture[i], NULL);
 850    }
 851    aaline->num_textures = num;
 852
 853    /* pass-through */
 854    aaline->driver_set_sampler_textures(aaline->pipe, num, texture);
 855 }
 856
 857
 858 /**
 859  * Called by drivers that want to install this AA line prim stage
 860  * into the draw module's pipeline.  This will not be used if the
 861  * hardware has native support for AA lines.
 862  */
 863 boolean
 864 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 865 {
 866    struct aaline_stage *aaline;
 867
 868    pipe->draw = (void *) draw;
 869
 870    /*
 871     * Create / install AA line drawing / prim stage
 872     */
 873    aaline = draw_aaline_stage( draw );
 874    if (!aaline)
 875       goto fail;
 876
 877    aaline->pipe = pipe;
 878
 879    /* create special texture, sampler state */
 880    if (!aaline_create_texture(aaline))
 881       goto fail;
 882
 883    if (!aaline_create_sampler(aaline))
 884       goto fail;
 885
 886    /* save original driver functions */
 887    aaline->driver_create_fs_state = pipe->create_fs_state;
 888    aaline->driver_bind_fs_state = pipe->bind_fs_state;
 889    aaline->driver_delete_fs_state = pipe->delete_fs_state;
 890
 891    aaline->driver_bind_sampler_states = pipe->bind_sampler_states;
 892    aaline->driver_set_sampler_textures = pipe->set_sampler_textures;
 893
 894    /* override the driver's functions */
 895    pipe->create_fs_state = aaline_create_fs_state;
 896    pipe->bind_fs_state = aaline_bind_fs_state;
 897    pipe->delete_fs_state = aaline_delete_fs_state;
 898
 899    pipe->bind_sampler_states = aaline_bind_sampler_states;
 900    pipe->set_sampler_textures = aaline_set_sampler_textures;
 901
 902    /* Install once everything is known to be OK:
 903     */
 904    draw->pipeline.aaline = &aaline->stage;
 905
 906    return TRUE;
 907
 908  fail:
 909    if (aaline)
 910       aaline->stage.destroy( &aaline->stage );
 911
 912    return FALSE;
 913 }