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_inlines.h"
  36 #include "pipe/p_context.h"
  37 #include "pipe/p_defines.h"
  38 #include "pipe/p_shader_tokens.h"
  39 #include "util/u_math.h"
  40 #include "util/u_memory.h"
  41
  42 #include "tgsi/tgsi_transform.h"
  43 #include "tgsi/tgsi_dump.h"
  44
  45 #include "draw_context.h"
  46 #include "draw_private.h"
  47 #include "draw_pipe.h"
  48
  49
  50 /**
  51  * Max texture level for the alpha texture used for antialiasing
  52  */
  53 #define MAX_TEXTURE_LEVEL  5   /* 32 x 32 */
  54
  55
  56 /**
  57  * Subclass of pipe_shader_state to carry extra fragment shader info.
  58  */
  59 struct aaline_fragment_shader
  60 {
  61    struct pipe_shader_state state;
  62    void *driver_fs;
  63    void *aaline_fs;
  64    void *aapoint_fs; /* not yet */
  65    void *sprite_fs; /* not yet */
  66    uint sampler_unit;
  67    int generic_attrib;  /**< texcoord/generic used for texture */
  68 };
  69
  70
  71 /**
  72  * Subclass of draw_stage
  73  */
  74 struct aaline_stage
  75 {
  76    struct draw_stage stage;
  77
  78    float half_line_width;
  79
  80    /** For AA lines, this is the vertex attrib slot for the new texcoords */
  81    uint tex_slot;
  82    /** position, not necessarily output zero */
  83    uint pos_slot;
  84
  85    void *sampler_cso;
  86    struct pipe_texture *texture;
  87    uint num_samplers;
  88    uint num_textures;
  89
  90
  91    /*
  92     * Currently bound state
  93     */
  94    struct aaline_fragment_shader *fs;
  95    struct {
  96       void *sampler[PIPE_MAX_SAMPLERS];
  97       struct pipe_texture *texture[PIPE_MAX_SAMPLERS];
  98    } state;
  99
 100    /*
 101     * Driver interface/override functions
 102     */
 103    void * (*driver_create_fs_state)(struct pipe_context *,
 104                                     const struct pipe_shader_state *);
 105    void (*driver_bind_fs_state)(struct pipe_context *, void *);
 106    void (*driver_delete_fs_state)(struct pipe_context *, void *);
 107
 108    void (*driver_bind_sampler_states)(struct pipe_context *, unsigned,
 109                                       void **);
 110    void (*driver_set_sampler_textures)(struct pipe_context *, unsigned,
 111                                        struct pipe_texture **);
 112
 113    struct pipe_context *pipe;
 114 };
 115
 116
 117
 118 /**
 119  * Subclass of tgsi_transform_context, used for transforming the
 120  * user's fragment shader to add the special AA instructions.
 121  */
 122 struct aa_transform_context {
 123    struct tgsi_transform_context base;
 124    uint tempsUsed;  /**< bitmask */
 125    int colorOutput; /**< which output is the primary color */
 126    uint samplersUsed;  /**< bitfield of samplers used */
 127    int freeSampler;  /** an available sampler for the pstipple */
 128    int maxInput, maxGeneric;  /**< max input index found */
 129    int colorTemp, texTemp;  /**< temp registers */
 130    boolean firstInstruction;
 131 };
 132
 133
 134 /**
 135  * TGSI declaration transform callback.
 136  * Look for a free sampler, a free input attrib, and two free temp regs.
 137  */
 138 static void
 139 aa_transform_decl(struct tgsi_transform_context *ctx,
 140                   struct tgsi_full_declaration *decl)
 141 {
 142    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 143
 144    if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
 145        decl->Semantic.SemanticName == TGSI_SEMANTIC_COLOR &&
 146        decl->Semantic.SemanticIndex == 0) {
 147       aactx->colorOutput = decl->DeclarationRange.First;
 148    }
 149    else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
 150       uint i;
 151       for (i = decl->DeclarationRange.First;
 152            i <= decl->DeclarationRange.Last; i++) {
 153          aactx->samplersUsed |= 1 << i;
 154       }
 155    }
 156    else if (decl->Declaration.File == TGSI_FILE_INPUT) {
 157       if ((int) decl->DeclarationRange.Last > aactx->maxInput)
 158          aactx->maxInput = decl->DeclarationRange.Last;
 159       if (decl->Semantic.SemanticName == TGSI_SEMANTIC_GENERIC &&
 160            (int) decl->Semantic.SemanticIndex > aactx->maxGeneric) {
 161          aactx->maxGeneric = decl->Semantic.SemanticIndex;
 162       }
 163    }
 164    else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
 165       uint i;
 166       for (i = decl->DeclarationRange.First;
 167            i <= decl->DeclarationRange.Last; i++) {
 168          aactx->tempsUsed |= (1 << i);
 169       }
 170    }
 171
 172    ctx->emit_declaration(ctx, decl);
 173 }
 174
 175
 176 /**
 177  * Find the lowest zero bit in the given word, or -1 if bitfield is all ones.
 178  */
 179 static int
 180 free_bit(uint bitfield)
 181 {
 182    int i;
 183    for (i = 0; i < 32; i++) {
 184       if ((bitfield & (1 << i)) == 0)
 185          return i;
 186    }
 187    return -1;
 188 }
 189
 190
 191 /**
 192  * TGSI instruction transform callback.
 193  * Replace writes to result.color w/ a temp reg.
 194  * Upon END instruction, insert texture sampling code for antialiasing.
 195  */
 196 static void
 197 aa_transform_inst(struct tgsi_transform_context *ctx,
 198                   struct tgsi_full_instruction *inst)
 199 {
 200    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 201
 202    if (aactx->firstInstruction) {
 203       /* emit our new declarations before the first instruction */
 204
 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 = TGSI_INTERPOLATE_PERSPECTIVE;
 233       decl.Declaration.Semantic = 1;
 234       decl.Semantic.SemanticName = TGSI_SEMANTIC_GENERIC;
 235       decl.Semantic.SemanticIndex = aactx->maxGeneric + 1;
 236       decl.DeclarationRange.First =
 237       decl.DeclarationRange.Last = aactx->maxInput + 1;
 238       ctx->emit_declaration(ctx, &decl);
 239
 240       /* declare new sampler */
 241       decl = tgsi_default_full_declaration();
 242       decl.Declaration.File = TGSI_FILE_SAMPLER;
 243       decl.DeclarationRange.First =
 244       decl.DeclarationRange.Last = aactx->freeSampler;
 245       ctx->emit_declaration(ctx, &decl);
 246
 247       /* declare new temp regs */
 248       decl = tgsi_default_full_declaration();
 249       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 250       decl.DeclarationRange.First =
 251       decl.DeclarationRange.Last = aactx->texTemp;
 252       ctx->emit_declaration(ctx, &decl);
 253
 254       decl = tgsi_default_full_declaration();
 255       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 256       decl.DeclarationRange.First =
 257       decl.DeclarationRange.Last = aactx->colorTemp;
 258       ctx->emit_declaration(ctx, &decl);
 259
 260       aactx->firstInstruction = FALSE;
 261    }
 262
 263    if (inst->Instruction.Opcode == TGSI_OPCODE_END &&
 264        aactx->colorOutput != -1) {
 265       struct tgsi_full_instruction newInst;
 266
 267       /* TEX */
 268       newInst = tgsi_default_full_instruction();
 269       newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
 270       newInst.Instruction.NumDstRegs = 1;
 271       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
 272       newInst.FullDstRegisters[0].DstRegister.Index = aactx->texTemp;
 273       newInst.Instruction.NumSrcRegs = 2;
 274       newInst.InstructionExtTexture.Texture = TGSI_TEXTURE_2D;
 275       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_INPUT;
 276       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->maxInput + 1;
 277       newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_SAMPLER;
 278       newInst.FullSrcRegisters[1].SrcRegister.Index = aactx->freeSampler;
 279
 280       ctx->emit_instruction(ctx, &newInst);
 281
 282       /* MOV rgb */
 283       newInst = tgsi_default_full_instruction();
 284       newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
 285       newInst.Instruction.NumDstRegs = 1;
 286       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_OUTPUT;
 287       newInst.FullDstRegisters[0].DstRegister.Index = aactx->colorOutput;
 288       newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_XYZ;
 289       newInst.Instruction.NumSrcRegs = 1;
 290       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
 291       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->colorTemp;
 292       ctx->emit_instruction(ctx, &newInst);
 293
 294       /* MUL alpha */
 295       newInst = tgsi_default_full_instruction();
 296       newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
 297       newInst.Instruction.NumDstRegs = 1;
 298       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_OUTPUT;
 299       newInst.FullDstRegisters[0].DstRegister.Index = aactx->colorOutput;
 300       newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_W;
 301       newInst.Instruction.NumSrcRegs = 2;
 302       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
 303       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->colorTemp;
 304       newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_TEMPORARY;
 305       newInst.FullSrcRegisters[1].SrcRegister.Index = aactx->texTemp;
 306       ctx->emit_instruction(ctx, &newInst);
 307
 308       /* END */
 309       newInst = tgsi_default_full_instruction();
 310       newInst.Instruction.Opcode = TGSI_OPCODE_END;
 311       newInst.Instruction.NumDstRegs = 0;
 312       newInst.Instruction.NumSrcRegs = 0;
 313       ctx->emit_instruction(ctx, &newInst);
 314    }
 315    else {
 316       /* Not an END instruction.
 317        * Look for writes to result.color and replace with colorTemp reg.
 318        */
 319       uint i;
 320
 321       for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 322          struct tgsi_full_dst_register *dst = &inst->FullDstRegisters[i];
 323          if (dst->DstRegister.File == TGSI_FILE_OUTPUT &&
 324              dst->DstRegister.Index == aactx->colorOutput) {
 325             dst->DstRegister.File = TGSI_FILE_TEMPORARY;
 326             dst->DstRegister.Index = aactx->colorTemp;
 327          }
 328       }
 329
 330       ctx->emit_instruction(ctx, inst);
 331    }
 332 }
 333
 334
 335 /**
 336  * Generate the frag shader we'll use for drawing AA lines.
 337  * This will be the user's shader plus some texture/modulate instructions.
 338  */
 339 static boolean
 340 generate_aaline_fs(struct aaline_stage *aaline)
 341 {
 342    const struct pipe_shader_state *orig_fs = &aaline->fs->state;
 343    struct pipe_shader_state aaline_fs;
 344    struct aa_transform_context transform;
 345
 346 #define MAX 1000
 347
 348    aaline_fs = *orig_fs; /* copy to init */
 349    aaline_fs.tokens = MALLOC(sizeof(struct tgsi_token) * MAX);
 350    if (aaline_fs.tokens == NULL)
 351       return FALSE;
 352
 353    memset(&transform, 0, sizeof(transform));
 354    transform.colorOutput = -1;
 355    transform.maxInput = -1;
 356    transform.maxGeneric = -1;
 357    transform.colorTemp = -1;
 358    transform.texTemp = -1;
 359    transform.firstInstruction = TRUE;
 360    transform.base.transform_instruction = aa_transform_inst;
 361    transform.base.transform_declaration = aa_transform_decl;
 362
 363    tgsi_transform_shader(orig_fs->tokens,
 364                          (struct tgsi_token *) aaline_fs.tokens,
 365                          MAX, &transform.base);
 366
 367 #if 0 /* DEBUG */
 368    tgsi_dump(orig_fs->tokens, 0);
 369    tgsi_dump(aaline_fs.tokens, 0);
 370 #endif
 371
 372    aaline->fs->sampler_unit = transform.freeSampler;
 373
 374    aaline->fs->aaline_fs
 375       = aaline->driver_create_fs_state(aaline->pipe, &aaline_fs);
 376    if (aaline->fs->aaline_fs == NULL)
 377       return FALSE;
 378
 379    aaline->fs->generic_attrib = transform.maxGeneric + 1;
 380    return TRUE;
 381 }
 382
 383
 384 /**
 385  * Create the texture map we'll use for antialiasing the lines.
 386  */
 387 static boolean
 388 aaline_create_texture(struct aaline_stage *aaline)
 389 {
 390    struct pipe_context *pipe = aaline->pipe;
 391    struct pipe_screen *screen = pipe->screen;
 392    struct pipe_texture texTemp;
 393    uint level;
 394
 395    memset(&texTemp, 0, sizeof(texTemp));
 396    texTemp.target = PIPE_TEXTURE_2D;
 397    texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
 398    texTemp.last_level = MAX_TEXTURE_LEVEL;
 399    texTemp.width[0] = 1 << MAX_TEXTURE_LEVEL;
 400    texTemp.height[0] = 1 << MAX_TEXTURE_LEVEL;
 401    texTemp.depth[0] = 1;
 402    pf_get_block(texTemp.format, &texTemp.block);
 403
 404    aaline->texture = screen->texture_create(screen, &texTemp);
 405    if (!aaline->texture)
 406       return FALSE;
 407
 408    /* Fill in mipmap images.
 409     * Basically each level is solid opaque, except for the outermost
 410     * texels which are zero.  Special case the 1x1 and 2x2 levels.
 411     */
 412    for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
 413       struct pipe_surface *surface;
 414       const uint size = aaline->texture->width[level];
 415       ubyte *data;
 416       uint i, j;
 417
 418       assert(aaline->texture->width[level] == aaline->texture->height[level]);
 419
 420       /* This texture is new, no need to flush.
 421        */
 422       surface = screen->get_tex_surface(screen, aaline->texture, 0, level, 0,
 423                                         PIPE_BUFFER_USAGE_CPU_WRITE);
 424       data = screen->surface_map(screen, surface, PIPE_BUFFER_USAGE_CPU_WRITE);
 425       if (data == NULL)
 426          return FALSE;
 427
 428       for (i = 0; i < size; i++) {
 429          for (j = 0; j < size; j++) {
 430             ubyte d;
 431             if (size == 1) {
 432                d = 255;
 433             }
 434             else if (size == 2) {
 435                d = 200; /* tuneable */
 436             }
 437             else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
 438                d = 0;
 439             }
 440             else {
 441                d = 255;
 442             }
 443             data[i * surface->stride + j] = d;
 444          }
 445       }
 446
 447       /* unmap */
 448       screen->surface_unmap(screen, surface);
 449       screen->tex_surface_release(screen, &surface);
 450    }
 451    return TRUE;
 452 }
 453
 454
 455 /**
 456  * Create the sampler CSO that'll be used for antialiasing.
 457  * By using a mipmapped texture, we don't have to generate a different
 458  * texture image for each line size.
 459  */
 460 static boolean
 461 aaline_create_sampler(struct aaline_stage *aaline)
 462 {
 463    struct pipe_sampler_state sampler;
 464    struct pipe_context *pipe = aaline->pipe;
 465
 466    memset(&sampler, 0, sizeof(sampler));
 467    sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 468    sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 469    sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 470    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
 471    sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
 472    sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
 473    sampler.normalized_coords = 1;
 474    sampler.min_lod = 0.0f;
 475    sampler.max_lod = MAX_TEXTURE_LEVEL;
 476
 477    aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 478    if (aaline->sampler_cso == NULL)
 479       return FALSE;
 480
 481    return TRUE;
 482 }
 483
 484
 485 /**
 486  * When we're about to draw our first AA line in a batch, this function is
 487  * called to tell the driver to bind our modified fragment shader.
 488  */
 489 static boolean
 490 bind_aaline_fragment_shader(struct aaline_stage *aaline)
 491 {
 492    struct draw_context *draw = aaline->stage.draw;
 493
 494    if (!aaline->fs->aaline_fs &&
 495        !generate_aaline_fs(aaline))
 496       return FALSE;
 497
 498    draw->suspend_flushing = TRUE;
 499    aaline->driver_bind_fs_state(aaline->pipe, aaline->fs->aaline_fs);
 500    draw->suspend_flushing = FALSE;
 501
 502    return TRUE;
 503 }
 504
 505
 506
 507 static INLINE struct aaline_stage *
 508 aaline_stage( struct draw_stage *stage )
 509 {
 510    return (struct aaline_stage *) stage;
 511 }
 512
 513
 514 /**
 515  * Draw a wide line by drawing a quad, using geometry which will
 516  * fullfill GL's antialiased line requirements.
 517  */
 518 static void
 519 aaline_line(struct draw_stage *stage, struct prim_header *header)
 520 {
 521    const struct aaline_stage *aaline = aaline_stage(stage);
 522    const float half_width = aaline->half_line_width;
 523    struct prim_header tri;
 524    struct vertex_header *v[8];
 525    uint texPos = aaline->tex_slot;
 526    uint posPos = aaline->pos_slot;
 527    float *pos, *tex;
 528    float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
 529    float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
 530    double a = atan2(dy, dx);
 531    float c_a = (float) cos(a), s_a = (float) sin(a);
 532    uint i;
 533
 534    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 535    dx = 0.5F * half_width;
 536    dy = half_width;
 537
 538    /* allocate/dup new verts */
 539    for (i = 0; i < 8; i++) {
 540       v[i] = dup_vert(stage, header->v[i/4], i);
 541    }
 542
 543    /*
 544     * Quad strip for line from v0 to v1 (*=endpoints):
 545     *
 546     *  1   3                     5   7
 547     *  +---+---------------------+---+
 548     *  |                             |
 549     *  | *v0                     v1* |
 550     *  |                             |
 551     *  +---+---------------------+---+
 552     *  0   2                     4   6
 553     */
 554
 555    /* new verts */
 556    pos = v[0]->data[posPos];
 557    pos[0] += (-dx * c_a -  dy * s_a);
 558    pos[1] += (-dx * s_a +  dy * c_a);
 559
 560    pos = v[1]->data[posPos];
 561    pos[0] += (-dx * c_a - -dy * s_a);
 562    pos[1] += (-dx * s_a + -dy * c_a);
 563
 564    pos = v[2]->data[posPos];
 565    pos[0] += ( dx * c_a -  dy * s_a);
 566    pos[1] += ( dx * s_a +  dy * c_a);
 567
 568    pos = v[3]->data[posPos];
 569    pos[0] += ( dx * c_a - -dy * s_a);
 570    pos[1] += ( dx * s_a + -dy * c_a);
 571
 572    pos = v[4]->data[posPos];
 573    pos[0] += (-dx * c_a -  dy * s_a);
 574    pos[1] += (-dx * s_a +  dy * c_a);
 575
 576    pos = v[5]->data[posPos];
 577    pos[0] += (-dx * c_a - -dy * s_a);
 578    pos[1] += (-dx * s_a + -dy * c_a);
 579
 580    pos = v[6]->data[posPos];
 581    pos[0] += ( dx * c_a -  dy * s_a);
 582    pos[1] += ( dx * s_a +  dy * c_a);
 583
 584    pos = v[7]->data[posPos];
 585    pos[0] += ( dx * c_a - -dy * s_a);
 586    pos[1] += ( dx * s_a + -dy * c_a);
 587
 588    /* new texcoords */
 589    tex = v[0]->data[texPos];
 590    ASSIGN_4V(tex, 0, 0, 0, 1);
 591
 592    tex = v[1]->data[texPos];
 593    ASSIGN_4V(tex, 0, 1, 0, 1);
 594
 595    tex = v[2]->data[texPos];
 596    ASSIGN_4V(tex, .5, 0, 0, 1);
 597
 598    tex = v[3]->data[texPos];
 599    ASSIGN_4V(tex, .5, 1, 0, 1);
 600
 601    tex = v[4]->data[texPos];
 602    ASSIGN_4V(tex, .5, 0, 0, 1);
 603
 604    tex = v[5]->data[texPos];
 605    ASSIGN_4V(tex, .5, 1, 0, 1);
 606
 607    tex = v[6]->data[texPos];
 608    ASSIGN_4V(tex, 1, 0, 0, 1);
 609
 610    tex = v[7]->data[texPos];
 611    ASSIGN_4V(tex, 1, 1, 0, 1);
 612
 613    /* emit 6 tris for the quad strip */
 614    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 615    stage->next->tri( stage->next, &tri );
 616
 617    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 618    stage->next->tri( stage->next, &tri );
 619
 620    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 621    stage->next->tri( stage->next, &tri );
 622
 623    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 624    stage->next->tri( stage->next, &tri );
 625
 626    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 627    stage->next->tri( stage->next, &tri );
 628
 629    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 630    stage->next->tri( stage->next, &tri );
 631 }
 632
 633
 634 static void
 635 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 636 {
 637    auto struct aaline_stage *aaline = aaline_stage(stage);
 638    struct draw_context *draw = stage->draw;
 639    struct pipe_context *pipe = aaline->pipe;
 640    uint num_samplers;
 641
 642    assert(draw->rasterizer->line_smooth);
 643
 644    if (draw->rasterizer->line_width <= 3.0)
 645       aaline->half_line_width = 1.5f;
 646    else
 647       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 648
 649    /*
 650     * Bind (generate) our fragprog, sampler and texture
 651     */
 652    if (!bind_aaline_fragment_shader(aaline)) {
 653       stage->line = draw_pipe_passthrough_line;
 654       stage->line(stage, header);
 655       return;
 656    }
 657
 658    /* update vertex attrib info */
 659    aaline->tex_slot = draw->vs.num_vs_outputs;
 660    aaline->pos_slot = draw->vs.position_output;
 661
 662    /* advertise the extra post-transformed vertex attribute */
 663    draw->extra_vp_outputs.semantic_name = TGSI_SEMANTIC_GENERIC;
 664    draw->extra_vp_outputs.semantic_index = aaline->fs->generic_attrib;
 665    draw->extra_vp_outputs.slot = aaline->tex_slot;
 666
 667    /* how many samplers? */
 668    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 669    num_samplers = MAX2(aaline->num_textures, aaline->num_samplers);
 670    num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
 671
 672    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 673    pipe_texture_reference(&aaline->state.texture[aaline->fs->sampler_unit],
 674                           aaline->texture);
 675
 676    draw->suspend_flushing = TRUE;
 677    aaline->driver_bind_sampler_states(pipe, num_samplers, aaline->state.sampler);
 678    aaline->driver_set_sampler_textures(pipe, num_samplers, aaline->state.texture);
 679    draw->suspend_flushing = FALSE;
 680
 681    /* now really draw first line */
 682    stage->line = aaline_line;
 683    stage->line(stage, header);
 684 }
 685
 686
 687 static void
 688 aaline_flush(struct draw_stage *stage, unsigned flags)
 689 {
 690    struct draw_context *draw = stage->draw;
 691    struct aaline_stage *aaline = aaline_stage(stage);
 692    struct pipe_context *pipe = aaline->pipe;
 693
 694    stage->line = aaline_first_line;
 695    stage->next->flush( stage->next, flags );
 696
 697    /* restore original frag shader, texture, sampler state */
 698    draw->suspend_flushing = TRUE;
 699    aaline->driver_bind_fs_state(pipe, aaline->fs->driver_fs);
 700    aaline->driver_bind_sampler_states(pipe, aaline->num_samplers,
 701                                       aaline->state.sampler);
 702    aaline->driver_set_sampler_textures(pipe, aaline->num_textures,
 703                                        aaline->state.texture);
 704    draw->suspend_flushing = FALSE;
 705
 706    draw->extra_vp_outputs.slot = 0;
 707 }
 708
 709
 710 static void
 711 aaline_reset_stipple_counter(struct draw_stage *stage)
 712 {
 713    stage->next->reset_stipple_counter( stage->next );
 714 }
 715
 716
 717 static void
 718 aaline_destroy(struct draw_stage *stage)
 719 {
 720    struct aaline_stage *aaline = aaline_stage(stage);
 721    uint i;
 722
 723    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 724       pipe_texture_reference(&aaline->state.texture[i], NULL);
 725    }
 726
 727    if (aaline->sampler_cso)
 728       aaline->pipe->delete_sampler_state(aaline->pipe, aaline->sampler_cso);
 729
 730    if (aaline->texture)
 731       pipe_texture_release(&aaline->texture);
 732
 733    draw_free_temp_verts( stage );
 734
 735    FREE( stage );
 736 }
 737
 738
 739 static struct aaline_stage *
 740 draw_aaline_stage(struct draw_context *draw)
 741 {
 742    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 743    if (aaline == NULL)
 744       return NULL;
 745
 746    if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
 747       goto fail;
 748
 749    aaline->stage.draw = draw;
 750    aaline->stage.next = NULL;
 751    aaline->stage.point = draw_pipe_passthrough_point;
 752    aaline->stage.line = aaline_first_line;
 753    aaline->stage.tri = draw_pipe_passthrough_tri;
 754    aaline->stage.flush = aaline_flush;
 755    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 756    aaline->stage.destroy = aaline_destroy;
 757
 758    return aaline;
 759
 760  fail:
 761    if (aaline)
 762       aaline_destroy(&aaline->stage);
 763
 764    return NULL;
 765 }
 766
 767
 768 static struct aaline_stage *
 769 aaline_stage_from_pipe(struct pipe_context *pipe)
 770 {
 771    struct draw_context *draw = (struct draw_context *) pipe->draw;
 772    return aaline_stage(draw->pipeline.aaline);
 773 }
 774
 775
 776 /**
 777  * This function overrides the driver's create_fs_state() function and
 778  * will typically be called by the state tracker.
 779  */
 780 static void *
 781 aaline_create_fs_state(struct pipe_context *pipe,
 782                        const struct pipe_shader_state *fs)
 783 {
 784    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 785    struct aaline_fragment_shader *aafs = CALLOC_STRUCT(aaline_fragment_shader);
 786    if (aafs == NULL)
 787       return NULL;
 788
 789    aafs->state = *fs;
 790
 791    /* pass-through */
 792    aafs->driver_fs = aaline->driver_create_fs_state(aaline->pipe, fs);
 793
 794    return aafs;
 795 }
 796
 797
 798 static void
 799 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 800 {
 801    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 802    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 803
 804    /* save current */
 805    aaline->fs = aafs;
 806    /* pass-through */
 807    aaline->driver_bind_fs_state(aaline->pipe,
 808                                 (aafs ? aafs->driver_fs : NULL));
 809 }
 810
 811
 812 static void
 813 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 814 {
 815    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 816    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 817    /* pass-through */
 818    aaline->driver_delete_fs_state(aaline->pipe, aafs->driver_fs);
 819    FREE(aafs);
 820 }
 821
 822
 823 static void
 824 aaline_bind_sampler_states(struct pipe_context *pipe,
 825                            unsigned num, void **sampler)
 826 {
 827    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 828
 829    /* save current */
 830    memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 831    aaline->num_samplers = num;
 832
 833    /* pass-through */
 834    aaline->driver_bind_sampler_states(aaline->pipe, num, sampler);
 835 }
 836
 837
 838 static void
 839 aaline_set_sampler_textures(struct pipe_context *pipe,
 840                             unsigned num, struct pipe_texture **texture)
 841 {
 842    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 843    uint i;
 844
 845    /* save current */
 846    for (i = 0; i < num; i++) {
 847       pipe_texture_reference(&aaline->state.texture[i], texture[i]);
 848    }
 849    for ( ; i < PIPE_MAX_SAMPLERS; i++) {
 850       pipe_texture_reference(&aaline->state.texture[i], NULL);
 851    }
 852    aaline->num_textures = num;
 853
 854    /* pass-through */
 855    aaline->driver_set_sampler_textures(aaline->pipe, num, texture);
 856 }
 857
 858
 859 /**
 860  * Called by drivers that want to install this AA line prim stage
 861  * into the draw module's pipeline.  This will not be used if the
 862  * hardware has native support for AA lines.
 863  */
 864 boolean
 865 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 866 {
 867    struct aaline_stage *aaline;
 868
 869    pipe->draw = (void *) draw;
 870
 871    /*
 872     * Create / install AA line drawing / prim stage
 873     */
 874    aaline = draw_aaline_stage( draw );
 875    if (!aaline)
 876       goto fail;
 877
 878    aaline->pipe = pipe;
 879
 880    /* create special texture, sampler state */
 881    if (!aaline_create_texture(aaline))
 882       goto fail;
 883
 884    if (!aaline_create_sampler(aaline))
 885       goto fail;
 886
 887    /* save original driver functions */
 888    aaline->driver_create_fs_state = pipe->create_fs_state;
 889    aaline->driver_bind_fs_state = pipe->bind_fs_state;
 890    aaline->driver_delete_fs_state = pipe->delete_fs_state;
 891
 892    aaline->driver_bind_sampler_states = pipe->bind_sampler_states;
 893    aaline->driver_set_sampler_textures = pipe->set_sampler_textures;
 894
 895    /* override the driver's functions */
 896    pipe->create_fs_state = aaline_create_fs_state;
 897    pipe->bind_fs_state = aaline_bind_fs_state;
 898    pipe->delete_fs_state = aaline_delete_fs_state;
 899
 900    pipe->bind_sampler_states = aaline_bind_sampler_states;
 901    pipe->set_sampler_textures = aaline_set_sampler_textures;
 902
 903    /* Install once everything is known to be OK:
 904     */
 905    draw->pipeline.aaline = &aaline->stage;
 906
 907    return TRUE;
 908
 909  fail:
 910    if (aaline)
 911       aaline->stage.destroy( &aaline->stage );
 912
 913    return FALSE;
 914 }