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_inlines.h"
  39
  40 #include "util/u_format.h"
  41 #include "util/u_math.h"
  42 #include "util/u_memory.h"
  43 #include "util/u_sampler.h"
  44
  45 #include "tgsi/tgsi_transform.h"
  46 #include "tgsi/tgsi_dump.h"
  47
  48 #include "draw_context.h"
  49 #include "draw_private.h"
  50 #include "draw_pipe.h"
  51
  52
  53 /** Approx number of new tokens for instructions in aa_transform_inst() */
  54 #define NUM_NEW_TOKENS 50
  55
  56
  57 /**
  58  * Max texture level for the alpha texture used for antialiasing
  59  */
  60 #define MAX_TEXTURE_LEVEL  5   /* 32 x 32 */
  61
  62
  63 /**
  64  * Subclass of pipe_shader_state to carry extra fragment shader info.
  65  */
  66 struct aaline_fragment_shader
  67 {
  68    struct pipe_shader_state state;
  69    void *driver_fs;
  70    void *aaline_fs;
  71    uint sampler_unit;
  72    int generic_attrib;  /**< texcoord/generic used for texture */
  73 };
  74
  75
  76 /**
  77  * Subclass of draw_stage
  78  */
  79 struct aaline_stage
  80 {
  81    struct draw_stage stage;
  82
  83    float half_line_width;
  84
  85    /** For AA lines, this is the vertex attrib slot for the new texcoords */
  86    uint tex_slot;
  87    /** position, not necessarily output zero */
  88    uint pos_slot;
  89
  90    void *sampler_cso;
  91    struct pipe_resource *texture;
  92    struct pipe_sampler_view *sampler_view;
  93    uint num_samplers;
  94    uint num_sampler_views;
  95
  96
  97    /*
  98     * Currently bound state
  99     */
 100    struct aaline_fragment_shader *fs;
 101    struct {
 102       void *sampler[PIPE_MAX_SAMPLERS];
 103       struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 104    } state;
 105
 106    /*
 107     * Driver interface/override functions
 108     */
 109    void * (*driver_create_fs_state)(struct pipe_context *,
 110                                     const struct pipe_shader_state *);
 111    void (*driver_bind_fs_state)(struct pipe_context *, void *);
 112    void (*driver_delete_fs_state)(struct pipe_context *, void *);
 113
 114    void (*driver_bind_sampler_states)(struct pipe_context *, unsigned,
 115                                       void **);
 116
 117    void (*driver_set_sampler_views)(struct pipe_context *,
 118                                     unsigned,
 119                                     struct pipe_sampler_view **);
 120 };
 121
 122
 123
 124 /**
 125  * Subclass of tgsi_transform_context, used for transforming the
 126  * user's fragment shader to add the special AA instructions.
 127  */
 128 struct aa_transform_context {
 129    struct tgsi_transform_context base;
 130    uint tempsUsed;  /**< bitmask */
 131    int colorOutput; /**< which output is the primary color */
 132    uint samplersUsed;  /**< bitfield of samplers used */
 133    int freeSampler;  /** an available sampler for the pstipple */
 134    int maxInput, maxGeneric;  /**< max input index found */
 135    int colorTemp, texTemp;  /**< temp registers */
 136    boolean firstInstruction;
 137 };
 138
 139
 140 /**
 141  * TGSI declaration transform callback.
 142  * Look for a free sampler, a free input attrib, and two free temp regs.
 143  */
 144 static void
 145 aa_transform_decl(struct tgsi_transform_context *ctx,
 146                   struct tgsi_full_declaration *decl)
 147 {
 148    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 149
 150    if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
 151        decl->Semantic.Name == TGSI_SEMANTIC_COLOR &&
 152        decl->Semantic.Index == 0) {
 153       aactx->colorOutput = decl->Range.First;
 154    }
 155    else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
 156       uint i;
 157       for (i = decl->Range.First;
 158            i <= decl->Range.Last; i++) {
 159          aactx->samplersUsed |= 1 << i;
 160       }
 161    }
 162    else if (decl->Declaration.File == TGSI_FILE_INPUT) {
 163       if ((int) decl->Range.Last > aactx->maxInput)
 164          aactx->maxInput = decl->Range.Last;
 165       if (decl->Semantic.Name == TGSI_SEMANTIC_GENERIC &&
 166            (int) decl->Semantic.Index > aactx->maxGeneric) {
 167          aactx->maxGeneric = decl->Semantic.Index;
 168       }
 169    }
 170    else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
 171       uint i;
 172       for (i = decl->Range.First;
 173            i <= decl->Range.Last; i++) {
 174          aactx->tempsUsed |= (1 << i);
 175       }
 176    }
 177
 178    ctx->emit_declaration(ctx, decl);
 179 }
 180
 181
 182 /**
 183  * Find the lowest zero bit in the given word, or -1 if bitfield is all ones.
 184  */
 185 static int
 186 free_bit(uint bitfield)
 187 {
 188    return ffs(~bitfield) - 1;
 189 }
 190
 191
 192 /**
 193  * TGSI instruction transform callback.
 194  * Replace writes to result.color w/ a temp reg.
 195  * Upon END instruction, insert texture sampling code for antialiasing.
 196  */
 197 static void
 198 aa_transform_inst(struct tgsi_transform_context *ctx,
 199                   struct tgsi_full_instruction *inst)
 200 {
 201    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 202
 203    if (aactx->firstInstruction) {
 204       /* emit our new declarations before the first instruction */
 205
 206       struct tgsi_full_declaration decl;
 207       uint i;
 208
 209       /* find free sampler */
 210       aactx->freeSampler = free_bit(aactx->samplersUsed);
 211       if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
 212          aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
 213
 214       /* find two free temp regs */
 215       for (i = 0; i < 32; i++) {
 216          if ((aactx->tempsUsed & (1 << i)) == 0) {
 217             /* found a free temp */
 218             if (aactx->colorTemp < 0)
 219                aactx->colorTemp  = i;
 220             else if (aactx->texTemp < 0)
 221                aactx->texTemp  = i;
 222             else
 223                break;
 224          }
 225       }
 226       assert(aactx->colorTemp >= 0);
 227       assert(aactx->texTemp >= 0);
 228
 229       /* declare new generic input/texcoord */
 230       decl = tgsi_default_full_declaration();
 231       decl.Declaration.File = TGSI_FILE_INPUT;
 232       /* XXX this could be linear... */
 233       decl.Declaration.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
 234       decl.Declaration.Semantic = 1;
 235       decl.Semantic.Name = TGSI_SEMANTIC_GENERIC;
 236       decl.Semantic.Index = aactx->maxGeneric + 1;
 237       decl.Range.First =
 238       decl.Range.Last = aactx->maxInput + 1;
 239       ctx->emit_declaration(ctx, &decl);
 240
 241       /* declare new sampler */
 242       decl = tgsi_default_full_declaration();
 243       decl.Declaration.File = TGSI_FILE_SAMPLER;
 244       decl.Range.First =
 245       decl.Range.Last = aactx->freeSampler;
 246       ctx->emit_declaration(ctx, &decl);
 247
 248       /* declare new temp regs */
 249       decl = tgsi_default_full_declaration();
 250       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 251       decl.Range.First =
 252       decl.Range.Last = aactx->texTemp;
 253       ctx->emit_declaration(ctx, &decl);
 254
 255       decl = tgsi_default_full_declaration();
 256       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 257       decl.Range.First =
 258       decl.Range.Last = aactx->colorTemp;
 259       ctx->emit_declaration(ctx, &decl);
 260
 261       aactx->firstInstruction = FALSE;
 262    }
 263
 264    if (inst->Instruction.Opcode == TGSI_OPCODE_END &&
 265        aactx->colorOutput != -1) {
 266       struct tgsi_full_instruction newInst;
 267
 268       /* TEX */
 269       newInst = tgsi_default_full_instruction();
 270       newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
 271       newInst.Instruction.NumDstRegs = 1;
 272       newInst.Dst[0].Register.File = TGSI_FILE_TEMPORARY;
 273       newInst.Dst[0].Register.Index = aactx->texTemp;
 274       newInst.Instruction.NumSrcRegs = 2;
 275       newInst.Instruction.Texture = TRUE;
 276       newInst.Texture.Texture = TGSI_TEXTURE_2D;
 277       newInst.Src[0].Register.File = TGSI_FILE_INPUT;
 278       newInst.Src[0].Register.Index = aactx->maxInput + 1;
 279       newInst.Src[1].Register.File = TGSI_FILE_SAMPLER;
 280       newInst.Src[1].Register.Index = aactx->freeSampler;
 281
 282       ctx->emit_instruction(ctx, &newInst);
 283
 284       /* MOV rgb */
 285       newInst = tgsi_default_full_instruction();
 286       newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
 287       newInst.Instruction.NumDstRegs = 1;
 288       newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
 289       newInst.Dst[0].Register.Index = aactx->colorOutput;
 290       newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_XYZ;
 291       newInst.Instruction.NumSrcRegs = 1;
 292       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 293       newInst.Src[0].Register.Index = aactx->colorTemp;
 294       ctx->emit_instruction(ctx, &newInst);
 295
 296       /* MUL alpha */
 297       newInst = tgsi_default_full_instruction();
 298       newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
 299       newInst.Instruction.NumDstRegs = 1;
 300       newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
 301       newInst.Dst[0].Register.Index = aactx->colorOutput;
 302       newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_W;
 303       newInst.Instruction.NumSrcRegs = 2;
 304       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 305       newInst.Src[0].Register.Index = aactx->colorTemp;
 306       newInst.Src[1].Register.File = TGSI_FILE_TEMPORARY;
 307       newInst.Src[1].Register.Index = aactx->texTemp;
 308       ctx->emit_instruction(ctx, &newInst);
 309
 310       /* END */
 311       newInst = tgsi_default_full_instruction();
 312       newInst.Instruction.Opcode = TGSI_OPCODE_END;
 313       newInst.Instruction.NumDstRegs = 0;
 314       newInst.Instruction.NumSrcRegs = 0;
 315       ctx->emit_instruction(ctx, &newInst);
 316    }
 317    else {
 318       /* Not an END instruction.
 319        * Look for writes to result.color and replace with colorTemp reg.
 320        */
 321       uint i;
 322
 323       for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 324          struct tgsi_full_dst_register *dst = &inst->Dst[i];
 325          if (dst->Register.File == TGSI_FILE_OUTPUT &&
 326              dst->Register.Index == aactx->colorOutput) {
 327             dst->Register.File = TGSI_FILE_TEMPORARY;
 328             dst->Register.Index = aactx->colorTemp;
 329          }
 330       }
 331
 332       ctx->emit_instruction(ctx, inst);
 333    }
 334 }
 335
 336
 337 /**
 338  * Generate the frag shader we'll use for drawing AA lines.
 339  * This will be the user's shader plus some texture/modulate instructions.
 340  */
 341 static boolean
 342 generate_aaline_fs(struct aaline_stage *aaline)
 343 {
 344    struct pipe_context *pipe = aaline->stage.draw->pipe;
 345    const struct pipe_shader_state *orig_fs = &aaline->fs->state;
 346    struct pipe_shader_state aaline_fs;
 347    struct aa_transform_context transform;
 348    const uint newLen = tgsi_num_tokens(orig_fs->tokens) + NUM_NEW_TOKENS;
 349
 350    aaline_fs = *orig_fs; /* copy to init */
 351    aaline_fs.tokens = tgsi_alloc_tokens(newLen);
 352    if (aaline_fs.tokens == NULL)
 353       return FALSE;
 354
 355    memset(&transform, 0, sizeof(transform));
 356    transform.colorOutput = -1;
 357    transform.maxInput = -1;
 358    transform.maxGeneric = -1;
 359    transform.colorTemp = -1;
 360    transform.texTemp = -1;
 361    transform.firstInstruction = TRUE;
 362    transform.base.transform_instruction = aa_transform_inst;
 363    transform.base.transform_declaration = aa_transform_decl;
 364
 365    tgsi_transform_shader(orig_fs->tokens,
 366                          (struct tgsi_token *) aaline_fs.tokens,
 367                          newLen, &transform.base);
 368
 369 #if 0 /* DEBUG */
 370    tgsi_dump(orig_fs->tokens, 0);
 371    tgsi_dump(aaline_fs.tokens, 0);
 372 #endif
 373
 374    aaline->fs->sampler_unit = transform.freeSampler;
 375
 376    aaline->fs->aaline_fs = aaline->driver_create_fs_state(pipe, &aaline_fs);
 377    if (aaline->fs->aaline_fs == NULL)
 378       goto fail;
 379
 380    aaline->fs->generic_attrib = transform.maxGeneric + 1;
 381    FREE((void *)aaline_fs.tokens);
 382    return TRUE;
 383
 384 fail:
 385    FREE((void *)aaline_fs.tokens);
 386    return FALSE;
 387 }
 388
 389
 390 /**
 391  * Create the texture map we'll use for antialiasing the lines.
 392  */
 393 static boolean
 394 aaline_create_texture(struct aaline_stage *aaline)
 395 {
 396    struct pipe_context *pipe = aaline->stage.draw->pipe;
 397    struct pipe_screen *screen = pipe->screen;
 398    struct pipe_resource texTemp;
 399    struct pipe_sampler_view viewTempl;
 400    uint level;
 401
 402    memset(&texTemp, 0, sizeof(texTemp));
 403    texTemp.target = PIPE_TEXTURE_2D;
 404    texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
 405    texTemp.last_level = MAX_TEXTURE_LEVEL;
 406    texTemp.width0 = 1 << MAX_TEXTURE_LEVEL;
 407    texTemp.height0 = 1 << MAX_TEXTURE_LEVEL;
 408    texTemp.depth0 = 1;
 409    texTemp.array_size = 1;
 410    texTemp.bind = PIPE_BIND_SAMPLER_VIEW;
 411
 412    aaline->texture = screen->resource_create(screen, &texTemp);
 413    if (!aaline->texture)
 414       return FALSE;
 415
 416    u_sampler_view_default_template(&viewTempl,
 417                                    aaline->texture,
 418                                    aaline->texture->format);
 419    aaline->sampler_view = pipe->create_sampler_view(pipe,
 420                                                     aaline->texture,
 421                                                     &viewTempl);
 422    if (!aaline->sampler_view) {
 423       return FALSE;
 424    }
 425
 426    /* Fill in mipmap images.
 427     * Basically each level is solid opaque, except for the outermost
 428     * texels which are zero.  Special case the 1x1 and 2x2 levels
 429     * (though, those levels shouldn't be used - see the max_lod setting).
 430     */
 431    for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
 432       struct pipe_transfer *transfer;
 433       struct pipe_box box;
 434       const uint size = u_minify(aaline->texture->width0, level);
 435       ubyte *data;
 436       uint i, j;
 437
 438       assert(aaline->texture->width0 == aaline->texture->height0);
 439
 440       u_box_origin_2d( size, size, &box );
 441
 442       /* This texture is new, no need to flush.
 443        */
 444       transfer = pipe->get_transfer(pipe,
 445                                     aaline->texture,
 446                                     level,
 447                                     PIPE_TRANSFER_WRITE,
 448                                     &box);
 449
 450       data = pipe->transfer_map(pipe, transfer);
 451       if (data == NULL)
 452          return FALSE;
 453
 454       for (i = 0; i < size; i++) {
 455          for (j = 0; j < size; j++) {
 456             ubyte d;
 457             if (size == 1) {
 458                d = 255;
 459             }
 460             else if (size == 2) {
 461                d = 200; /* tuneable */
 462             }
 463             else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
 464                d = 0;
 465             }
 466             else {
 467                d = 255;
 468             }
 469             data[i * transfer->stride + j] = d;
 470          }
 471       }
 472
 473       /* unmap */
 474       pipe->transfer_unmap(pipe, transfer);
 475       pipe->transfer_destroy(pipe, transfer);
 476    }
 477    return TRUE;
 478 }
 479
 480
 481 /**
 482  * Create the sampler CSO that'll be used for antialiasing.
 483  * By using a mipmapped texture, we don't have to generate a different
 484  * texture image for each line size.
 485  */
 486 static boolean
 487 aaline_create_sampler(struct aaline_stage *aaline)
 488 {
 489    struct pipe_sampler_state sampler;
 490    struct pipe_context *pipe = aaline->stage.draw->pipe;
 491
 492    memset(&sampler, 0, sizeof(sampler));
 493    sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 494    sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 495    sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 496    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
 497    sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
 498    sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
 499    sampler.normalized_coords = 1;
 500    sampler.min_lod = 0.0f;
 501    /* avoid using the 1x1 and 2x2 mipmap levels */
 502    sampler.max_lod = MAX_TEXTURE_LEVEL - 2;
 503
 504    aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 505    if (aaline->sampler_cso == NULL)
 506       return FALSE;
 507
 508    return TRUE;
 509 }
 510
 511
 512 /**
 513  * When we're about to draw our first AA line in a batch, this function is
 514  * called to tell the driver to bind our modified fragment shader.
 515  */
 516 static boolean
 517 bind_aaline_fragment_shader(struct aaline_stage *aaline)
 518 {
 519    struct draw_context *draw = aaline->stage.draw;
 520    struct pipe_context *pipe = draw->pipe;
 521
 522    if (!aaline->fs->aaline_fs &&
 523        !generate_aaline_fs(aaline))
 524       return FALSE;
 525
 526    draw->suspend_flushing = TRUE;
 527    aaline->driver_bind_fs_state(pipe, aaline->fs->aaline_fs);
 528    draw->suspend_flushing = FALSE;
 529
 530    return TRUE;
 531 }
 532
 533
 534
 535 static INLINE struct aaline_stage *
 536 aaline_stage( struct draw_stage *stage )
 537 {
 538    return (struct aaline_stage *) stage;
 539 }
 540
 541
 542 /**
 543  * Draw a wide line by drawing a quad, using geometry which will
 544  * fullfill GL's antialiased line requirements.
 545  */
 546 static void
 547 aaline_line(struct draw_stage *stage, struct prim_header *header)
 548 {
 549    const struct aaline_stage *aaline = aaline_stage(stage);
 550    const float half_width = aaline->half_line_width;
 551    struct prim_header tri;
 552    struct vertex_header *v[8];
 553    uint texPos = aaline->tex_slot;
 554    uint posPos = aaline->pos_slot;
 555    float *pos, *tex;
 556    float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
 557    float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
 558    double a = atan2(dy, dx);
 559    float c_a = (float) cos(a), s_a = (float) sin(a);
 560    uint i;
 561
 562    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 563    dx = 0.5F * half_width;
 564    dy = half_width;
 565
 566    /* allocate/dup new verts */
 567    for (i = 0; i < 8; i++) {
 568       v[i] = dup_vert(stage, header->v[i/4], i);
 569    }
 570
 571    /*
 572     * Quad strip for line from v0 to v1 (*=endpoints):
 573     *
 574     *  1   3                     5   7
 575     *  +---+---------------------+---+
 576     *  |                             |
 577     *  | *v0                     v1* |
 578     *  |                             |
 579     *  +---+---------------------+---+
 580     *  0   2                     4   6
 581     */
 582
 583    /* new verts */
 584    pos = v[0]->data[posPos];
 585    pos[0] += (-dx * c_a -  dy * s_a);
 586    pos[1] += (-dx * s_a +  dy * c_a);
 587
 588    pos = v[1]->data[posPos];
 589    pos[0] += (-dx * c_a - -dy * s_a);
 590    pos[1] += (-dx * s_a + -dy * c_a);
 591
 592    pos = v[2]->data[posPos];
 593    pos[0] += ( dx * c_a -  dy * s_a);
 594    pos[1] += ( dx * s_a +  dy * c_a);
 595
 596    pos = v[3]->data[posPos];
 597    pos[0] += ( dx * c_a - -dy * s_a);
 598    pos[1] += ( dx * s_a + -dy * c_a);
 599
 600    pos = v[4]->data[posPos];
 601    pos[0] += (-dx * c_a -  dy * s_a);
 602    pos[1] += (-dx * s_a +  dy * c_a);
 603
 604    pos = v[5]->data[posPos];
 605    pos[0] += (-dx * c_a - -dy * s_a);
 606    pos[1] += (-dx * s_a + -dy * c_a);
 607
 608    pos = v[6]->data[posPos];
 609    pos[0] += ( dx * c_a -  dy * s_a);
 610    pos[1] += ( dx * s_a +  dy * c_a);
 611
 612    pos = v[7]->data[posPos];
 613    pos[0] += ( dx * c_a - -dy * s_a);
 614    pos[1] += ( dx * s_a + -dy * c_a);
 615
 616    /* new texcoords */
 617    tex = v[0]->data[texPos];
 618    ASSIGN_4V(tex, 0, 0, 0, 1);
 619
 620    tex = v[1]->data[texPos];
 621    ASSIGN_4V(tex, 0, 1, 0, 1);
 622
 623    tex = v[2]->data[texPos];
 624    ASSIGN_4V(tex, .5, 0, 0, 1);
 625
 626    tex = v[3]->data[texPos];
 627    ASSIGN_4V(tex, .5, 1, 0, 1);
 628
 629    tex = v[4]->data[texPos];
 630    ASSIGN_4V(tex, .5, 0, 0, 1);
 631
 632    tex = v[5]->data[texPos];
 633    ASSIGN_4V(tex, .5, 1, 0, 1);
 634
 635    tex = v[6]->data[texPos];
 636    ASSIGN_4V(tex, 1, 0, 0, 1);
 637
 638    tex = v[7]->data[texPos];
 639    ASSIGN_4V(tex, 1, 1, 0, 1);
 640
 641    /* emit 6 tris for the quad strip */
 642    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 643    stage->next->tri( stage->next, &tri );
 644
 645    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 646    stage->next->tri( stage->next, &tri );
 647
 648    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 649    stage->next->tri( stage->next, &tri );
 650
 651    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 652    stage->next->tri( stage->next, &tri );
 653
 654    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 655    stage->next->tri( stage->next, &tri );
 656
 657    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 658    stage->next->tri( stage->next, &tri );
 659 }
 660
 661
 662 static void
 663 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 664 {
 665    auto struct aaline_stage *aaline = aaline_stage(stage);
 666    struct draw_context *draw = stage->draw;
 667    struct pipe_context *pipe = draw->pipe;
 668    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 669    uint num_samplers;
 670    void *r;
 671
 672    assert(draw->rasterizer->line_smooth);
 673
 674    if (draw->rasterizer->line_width <= 2.2)
 675       aaline->half_line_width = 1.1f;
 676    else
 677       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 678
 679    /*
 680     * Bind (generate) our fragprog, sampler and texture
 681     */
 682    if (!bind_aaline_fragment_shader(aaline)) {
 683       stage->line = draw_pipe_passthrough_line;
 684       stage->line(stage, header);
 685       return;
 686    }
 687
 688    /* update vertex attrib info */
 689    aaline->tex_slot = draw_current_shader_outputs(draw);
 690    aaline->pos_slot = draw_current_shader_position_output(draw);;
 691
 692    /* allocate the extra post-transformed vertex attribute */
 693    (void) draw_alloc_extra_vertex_attrib(draw, TGSI_SEMANTIC_GENERIC,
 694                                          aaline->fs->generic_attrib);
 695
 696    /* how many samplers? */
 697    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 698    num_samplers = MAX2(aaline->num_sampler_views, aaline->num_samplers);
 699    num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
 700
 701    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 702    pipe_sampler_view_reference(&aaline->state.sampler_views[aaline->fs->sampler_unit],
 703                                aaline->sampler_view);
 704
 705    draw->suspend_flushing = TRUE;
 706    aaline->driver_bind_sampler_states(pipe, num_samplers, aaline->state.sampler);
 707    aaline->driver_set_sampler_views(pipe, num_samplers, aaline->state.sampler_views);
 708
 709    /* Disable triangle culling, stippling, unfilled mode etc. */
 710    r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
 711    pipe->bind_rasterizer_state(pipe, r);
 712
 713    draw->suspend_flushing = FALSE;
 714
 715    /* now really draw first line */
 716    stage->line = aaline_line;
 717    stage->line(stage, header);
 718 }
 719
 720
 721 static void
 722 aaline_flush(struct draw_stage *stage, unsigned flags)
 723 {
 724    struct draw_context *draw = stage->draw;
 725    struct aaline_stage *aaline = aaline_stage(stage);
 726    struct pipe_context *pipe = draw->pipe;
 727
 728    stage->line = aaline_first_line;
 729    stage->next->flush( stage->next, flags );
 730
 731    /* restore original frag shader, texture, sampler state */
 732    draw->suspend_flushing = TRUE;
 733    aaline->driver_bind_fs_state(pipe, aaline->fs->driver_fs);
 734    aaline->driver_bind_sampler_states(pipe, aaline->num_samplers,
 735                                       aaline->state.sampler);
 736    aaline->driver_set_sampler_views(pipe,
 737                                     aaline->num_sampler_views,
 738                                     aaline->state.sampler_views);
 739
 740    /* restore original rasterizer state */
 741    if (draw->rast_handle) {
 742       pipe->bind_rasterizer_state(pipe, draw->rast_handle);
 743    }
 744
 745    draw->suspend_flushing = FALSE;
 746
 747    draw_remove_extra_vertex_attribs(draw);
 748 }
 749
 750
 751 static void
 752 aaline_reset_stipple_counter(struct draw_stage *stage)
 753 {
 754    stage->next->reset_stipple_counter( stage->next );
 755 }
 756
 757
 758 static void
 759 aaline_destroy(struct draw_stage *stage)
 760 {
 761    struct aaline_stage *aaline = aaline_stage(stage);
 762    struct pipe_context *pipe = stage->draw->pipe;
 763    uint i;
 764
 765    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 766       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 767    }
 768
 769    if (aaline->sampler_cso)
 770       pipe->delete_sampler_state(pipe, aaline->sampler_cso);
 771
 772    if (aaline->texture)
 773       pipe_resource_reference(&aaline->texture, NULL);
 774
 775    if (aaline->sampler_view) {
 776       pipe_sampler_view_reference(&aaline->sampler_view, NULL);
 777    }
 778
 779    draw_free_temp_verts( stage );
 780
 781    FREE( stage );
 782 }
 783
 784
 785 static struct aaline_stage *
 786 draw_aaline_stage(struct draw_context *draw)
 787 {
 788    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 789    if (aaline == NULL)
 790       return NULL;
 791
 792    aaline->stage.draw = draw;
 793    aaline->stage.name = "aaline";
 794    aaline->stage.next = NULL;
 795    aaline->stage.point = draw_pipe_passthrough_point;
 796    aaline->stage.line = aaline_first_line;
 797    aaline->stage.tri = draw_pipe_passthrough_tri;
 798    aaline->stage.flush = aaline_flush;
 799    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 800    aaline->stage.destroy = aaline_destroy;
 801
 802    if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
 803       goto fail;
 804
 805    return aaline;
 806
 807  fail:
 808    if (aaline)
 809       aaline->stage.destroy(&aaline->stage);
 810
 811    return NULL;
 812 }
 813
 814
 815 static struct aaline_stage *
 816 aaline_stage_from_pipe(struct pipe_context *pipe)
 817 {
 818    struct draw_context *draw = (struct draw_context *) pipe->draw;
 819    return aaline_stage(draw->pipeline.aaline);
 820 }
 821
 822
 823 /**
 824  * This function overrides the driver's create_fs_state() function and
 825  * will typically be called by the state tracker.
 826  */
 827 static void *
 828 aaline_create_fs_state(struct pipe_context *pipe,
 829                        const struct pipe_shader_state *fs)
 830 {
 831    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 832    struct aaline_fragment_shader *aafs = CALLOC_STRUCT(aaline_fragment_shader);
 833
 834    if (aafs == NULL)
 835       return NULL;
 836
 837    aafs->state = *fs;
 838
 839    /* pass-through */
 840    aafs->driver_fs = aaline->driver_create_fs_state(pipe, fs);
 841
 842    return aafs;
 843 }
 844
 845
 846 static void
 847 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 848 {
 849    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 850    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 851
 852    /* save current */
 853    aaline->fs = aafs;
 854    /* pass-through */
 855    aaline->driver_bind_fs_state(pipe, (aafs ? aafs->driver_fs : NULL));
 856 }
 857
 858
 859 static void
 860 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 861 {
 862    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 863    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 864
 865    /* pass-through */
 866    aaline->driver_delete_fs_state(pipe, aafs->driver_fs);
 867
 868    if (aafs->aaline_fs)
 869       aaline->driver_delete_fs_state(pipe, aafs->aaline_fs);
 870
 871    FREE(aafs);
 872 }
 873
 874
 875 static void
 876 aaline_bind_sampler_states(struct pipe_context *pipe,
 877                            unsigned num, void **sampler)
 878 {
 879    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 880
 881    /* save current */
 882    memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 883    aaline->num_samplers = num;
 884
 885    /* pass-through */
 886    aaline->driver_bind_sampler_states(pipe, num, sampler);
 887 }
 888
 889
 890 static void
 891 aaline_set_sampler_views(struct pipe_context *pipe,
 892                          unsigned num,
 893                          struct pipe_sampler_view **views)
 894 {
 895    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 896    uint i;
 897
 898    /* save current */
 899    for (i = 0; i < num; i++) {
 900       pipe_sampler_view_reference(&aaline->state.sampler_views[i], views[i]);
 901    }
 902    for ( ; i < PIPE_MAX_SAMPLERS; i++) {
 903       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 904    }
 905    aaline->num_sampler_views = num;
 906
 907    /* pass-through */
 908    aaline->driver_set_sampler_views(pipe, num, views);
 909 }
 910
 911
 912 /**
 913  * Called by drivers that want to install this AA line prim stage
 914  * into the draw module's pipeline.  This will not be used if the
 915  * hardware has native support for AA lines.
 916  */
 917 boolean
 918 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 919 {
 920    struct aaline_stage *aaline;
 921
 922    pipe->draw = (void *) draw;
 923
 924    /*
 925     * Create / install AA line drawing / prim stage
 926     */
 927    aaline = draw_aaline_stage( draw );
 928    if (!aaline)
 929       goto fail;
 930
 931    /* create special texture, sampler state */
 932    if (!aaline_create_texture(aaline))
 933       goto fail;
 934
 935    if (!aaline_create_sampler(aaline))
 936       goto fail;
 937
 938    /* save original driver functions */
 939    aaline->driver_create_fs_state = pipe->create_fs_state;
 940    aaline->driver_bind_fs_state = pipe->bind_fs_state;
 941    aaline->driver_delete_fs_state = pipe->delete_fs_state;
 942
 943    aaline->driver_bind_sampler_states = pipe->bind_fragment_sampler_states;
 944    aaline->driver_set_sampler_views = pipe->set_fragment_sampler_views;
 945
 946    /* override the driver's functions */
 947    pipe->create_fs_state = aaline_create_fs_state;
 948    pipe->bind_fs_state = aaline_bind_fs_state;
 949    pipe->delete_fs_state = aaline_delete_fs_state;
 950
 951    pipe->bind_fragment_sampler_states = aaline_bind_sampler_states;
 952    pipe->set_fragment_sampler_views = aaline_set_sampler_views;
 953
 954    /* Install once everything is known to be OK:
 955     */
 956    draw->pipeline.aaline = &aaline->stage;
 957
 958    return TRUE;
 959
 960  fail:
 961    if (aaline)
 962       aaline->stage.destroy( &aaline->stage );
 963
 964    return FALSE;
 965 }