src/gallium/auxiliary/draw/draw_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
  47
  48 /**
  49  * Max texture level for the alpha texture used for antialiasing
  50  */
  51 #define MAX_TEXTURE_LEVEL  5   /* 32 x 32 */
  52
  53
  54 /**
  55  * Subclass of pipe_shader_state to carry extra fragment shader info.
  56  */
  57 struct aaline_fragment_shader
  58 {
  59    struct pipe_shader_state state;
  60    void *driver_fs;
  61    void *aaline_fs;
  62    void *aapoint_fs; /* not yet */
  63    void *sprite_fs; /* not yet */
  64    uint sampler_unit;
  65    int generic_attrib;  /**< texcoord/generic used for texture */
  66 };
  67
  68
  69 /**
  70  * Subclass of draw_stage
  71  */
  72 struct aaline_stage
  73 {
  74    struct draw_stage stage;
  75
  76    float half_line_width;
  77
  78    /** For AA lines, this is the vertex attrib slot for the new texcoords */
  79    uint tex_slot;
  80
  81    void *sampler_cso;
  82    struct pipe_texture *texture;
  83    uint num_samplers;
  84    uint num_textures;
  85
  86
  87    /*
  88     * Currently bound state
  89     */
  90    struct aaline_fragment_shader *fs;
  91    struct {
  92       void *sampler[PIPE_MAX_SAMPLERS];
  93       struct pipe_texture *texture[PIPE_MAX_SAMPLERS];
  94    } state;
  95
  96    /*
  97     * Driver interface/override functions
  98     */
  99    void * (*driver_create_fs_state)(struct pipe_context *,
 100                                     const struct pipe_shader_state *);
 101    void (*driver_bind_fs_state)(struct pipe_context *, void *);
 102    void (*driver_delete_fs_state)(struct pipe_context *, void *);
 103
 104    void (*driver_bind_sampler_states)(struct pipe_context *, unsigned,
 105                                       void **);
 106    void (*driver_set_sampler_textures)(struct pipe_context *, unsigned,
 107                                        struct pipe_texture **);
 108
 109    struct pipe_context *pipe;
 110 };
 111
 112
 113
 114 /**
 115  * Subclass of tgsi_transform_context, used for transforming the
 116  * user's fragment shader to add the special AA instructions.
 117  */
 118 struct aa_transform_context {
 119    struct tgsi_transform_context base;
 120    uint tempsUsed;  /**< bitmask */
 121    int colorOutput; /**< which output is the primary color */
 122    uint samplersUsed;  /**< bitfield of samplers used */
 123    int freeSampler;  /** an available sampler for the pstipple */
 124    int maxInput, maxGeneric;  /**< max input index found */
 125    int colorTemp, texTemp;  /**< temp registers */
 126    boolean firstInstruction;
 127 };
 128
 129
 130 /**
 131  * TGSI declaration transform callback.
 132  * Look for a free sampler, a free input attrib, and two free temp regs.
 133  */
 134 static void
 135 aa_transform_decl(struct tgsi_transform_context *ctx,
 136                   struct tgsi_full_declaration *decl)
 137 {
 138    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 139
 140    if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
 141        decl->Semantic.SemanticName == TGSI_SEMANTIC_COLOR &&
 142        decl->Semantic.SemanticIndex == 0) {
 143       aactx->colorOutput = decl->u.DeclarationRange.First;
 144    }
 145    else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
 146       uint i;
 147       for (i = decl->u.DeclarationRange.First;
 148            i <= decl->u.DeclarationRange.Last; i++) {
 149          aactx->samplersUsed |= 1 << i;
 150       }
 151    }
 152    else if (decl->Declaration.File == TGSI_FILE_INPUT) {
 153       if ((int) decl->u.DeclarationRange.Last > aactx->maxInput)
 154          aactx->maxInput = decl->u.DeclarationRange.Last;
 155       if (decl->Semantic.SemanticName == TGSI_SEMANTIC_GENERIC &&
 156            (int) decl->Semantic.SemanticIndex > aactx->maxGeneric) {
 157          aactx->maxGeneric = decl->Semantic.SemanticIndex;
 158       }
 159    }
 160    else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
 161       uint i;
 162       for (i = decl->u.DeclarationRange.First;
 163            i <= decl->u.DeclarationRange.Last; i++) {
 164          aactx->tempsUsed |= (1 << i);
 165       }
 166    }
 167
 168    ctx->emit_declaration(ctx, decl);
 169 }
 170
 171
 172 /**
 173  * Find the lowest zero bit in the given word, or -1 if bitfield is all ones.
 174  */
 175 static int
 176 free_bit(uint bitfield)
 177 {
 178    int i;
 179    for (i = 0; i < 32; i++) {
 180       if ((bitfield & (1 << i)) == 0)
 181          return i;
 182    }
 183    return -1;
 184 }
 185
 186
 187 /**
 188  * TGSI instruction transform callback.
 189  * Replace writes to result.color w/ a temp reg.
 190  * Upon END instruction, insert texture sampling code for antialiasing.
 191  */
 192 static void
 193 aa_transform_inst(struct tgsi_transform_context *ctx,
 194                   struct tgsi_full_instruction *inst)
 195 {
 196    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 197
 198    if (aactx->firstInstruction) {
 199       /* emit our new declarations before the first instruction */
 200
 201       struct tgsi_full_declaration decl;
 202       uint i;
 203
 204       /* find free sampler */
 205       aactx->freeSampler = free_bit(aactx->samplersUsed);
 206       if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
 207          aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
 208
 209       /* find two free temp regs */
 210       for (i = 0; i < 32; i++) {
 211          if ((aactx->tempsUsed & (1 << i)) == 0) {
 212             /* found a free temp */
 213             if (aactx->colorTemp < 0)
 214                aactx->colorTemp  = i;
 215             else if (aactx->texTemp < 0)
 216                aactx->texTemp  = i;
 217             else
 218                break;
 219          }
 220       }
 221       assert(aactx->colorTemp >= 0);
 222       assert(aactx->texTemp >= 0);
 223
 224       /* declare new generic input/texcoord */
 225       decl = tgsi_default_full_declaration();
 226       decl.Declaration.File = TGSI_FILE_INPUT;
 227       decl.Declaration.Semantic = 1;
 228       decl.Semantic.SemanticName = TGSI_SEMANTIC_GENERIC;
 229       decl.Semantic.SemanticIndex = aactx->maxGeneric + 1;
 230       decl.Declaration.Interpolate = 1;
 231       /* XXX this could be linear... */
 232       decl.Interpolation.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
 233       decl.u.DeclarationRange.First =
 234       decl.u.DeclarationRange.Last = aactx->maxInput + 1;
 235       ctx->emit_declaration(ctx, &decl);
 236
 237       /* declare new sampler */
 238       decl = tgsi_default_full_declaration();
 239       decl.Declaration.File = TGSI_FILE_SAMPLER;
 240       decl.u.DeclarationRange.First =
 241       decl.u.DeclarationRange.Last = aactx->freeSampler;
 242       ctx->emit_declaration(ctx, &decl);
 243
 244       /* declare new temp regs */
 245       decl = tgsi_default_full_declaration();
 246       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 247       decl.u.DeclarationRange.First =
 248       decl.u.DeclarationRange.Last = aactx->texTemp;
 249       ctx->emit_declaration(ctx, &decl);
 250
 251       decl = tgsi_default_full_declaration();
 252       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 253       decl.u.DeclarationRange.First =
 254       decl.u.DeclarationRange.Last = aactx->colorTemp;
 255       ctx->emit_declaration(ctx, &decl);
 256
 257       aactx->firstInstruction = FALSE;
 258    }
 259
 260    if (inst->Instruction.Opcode == TGSI_OPCODE_END &&
 261        aactx->colorOutput != -1) {
 262       struct tgsi_full_instruction newInst;
 263
 264       /* TEX */
 265       newInst = tgsi_default_full_instruction();
 266       newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
 267       newInst.Instruction.NumDstRegs = 1;
 268       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
 269       newInst.FullDstRegisters[0].DstRegister.Index = aactx->texTemp;
 270       newInst.Instruction.NumSrcRegs = 2;
 271       newInst.InstructionExtTexture.Texture = TGSI_TEXTURE_2D;
 272       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_INPUT;
 273       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->maxInput + 1;
 274       newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_SAMPLER;
 275       newInst.FullSrcRegisters[1].SrcRegister.Index = aactx->freeSampler;
 276
 277       ctx->emit_instruction(ctx, &newInst);
 278
 279       /* MOV rgb */
 280       newInst = tgsi_default_full_instruction();
 281       newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
 282       newInst.Instruction.NumDstRegs = 1;
 283       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_OUTPUT;
 284       newInst.FullDstRegisters[0].DstRegister.Index = aactx->colorOutput;
 285       newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_XYZ;
 286       newInst.Instruction.NumSrcRegs = 1;
 287       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
 288       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->colorTemp;
 289       ctx->emit_instruction(ctx, &newInst);
 290
 291       /* MUL alpha */
 292       newInst = tgsi_default_full_instruction();
 293       newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
 294       newInst.Instruction.NumDstRegs = 1;
 295       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_OUTPUT;
 296       newInst.FullDstRegisters[0].DstRegister.Index = aactx->colorOutput;
 297       newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_W;
 298       newInst.Instruction.NumSrcRegs = 2;
 299       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
 300       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->colorTemp;
 301       newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_TEMPORARY;
 302       newInst.FullSrcRegisters[1].SrcRegister.Index = aactx->texTemp;
 303       ctx->emit_instruction(ctx, &newInst);
 304
 305       /* END */
 306       newInst = tgsi_default_full_instruction();
 307       newInst.Instruction.Opcode = TGSI_OPCODE_END;
 308       newInst.Instruction.NumDstRegs = 0;
 309       newInst.Instruction.NumSrcRegs = 0;
 310       ctx->emit_instruction(ctx, &newInst);
 311    }
 312    else {
 313       /* Not an END instruction.
 314        * Look for writes to result.color and replace with colorTemp reg.
 315        */
 316       uint i;
 317
 318       for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 319          struct tgsi_full_dst_register *dst = &inst->FullDstRegisters[i];
 320          if (dst->DstRegister.File == TGSI_FILE_OUTPUT &&
 321              dst->DstRegister.Index == aactx->colorOutput) {
 322             dst->DstRegister.File = TGSI_FILE_TEMPORARY;
 323             dst->DstRegister.Index = aactx->colorTemp;
 324          }
 325       }
 326
 327       ctx->emit_instruction(ctx, inst);
 328    }
 329 }
 330
 331
 332 /**
 333  * Generate the frag shader we'll use for drawing AA lines.
 334  * This will be the user's shader plus some texture/modulate instructions.
 335  */
 336 static void
 337 generate_aaline_fs(struct aaline_stage *aaline)
 338 {
 339    const struct pipe_shader_state *orig_fs = &aaline->fs->state;
 340    //struct draw_context *draw = aaline->stage.draw;
 341    struct pipe_shader_state aaline_fs;
 342    struct aa_transform_context transform;
 343
 344 #define MAX 1000
 345
 346    aaline_fs = *orig_fs; /* copy to init */
 347    aaline_fs.tokens = MALLOC(sizeof(struct tgsi_token) * MAX);
 348
 349    memset(&transform, 0, sizeof(transform));
 350    transform.colorOutput = -1;
 351    transform.maxInput = -1;
 352    transform.maxGeneric = -1;
 353    transform.colorTemp = -1;
 354    transform.texTemp = -1;
 355    transform.firstInstruction = TRUE;
 356    transform.base.transform_instruction = aa_transform_inst;
 357    transform.base.transform_declaration = aa_transform_decl;
 358
 359    tgsi_transform_shader(orig_fs->tokens,
 360                          (struct tgsi_token *) aaline_fs.tokens,
 361                          MAX, &transform.base);
 362
 363 #if 0 /* DEBUG */
 364    tgsi_dump(orig_fs->tokens, 0);
 365    tgsi_dump(aaline_fs.tokens, 0);
 366 #endif
 367
 368    aaline->fs->sampler_unit = transform.freeSampler;
 369
 370    aaline->fs->aaline_fs
 371       = aaline->driver_create_fs_state(aaline->pipe, &aaline_fs);
 372
 373    aaline->fs->generic_attrib = transform.maxGeneric + 1;
 374 }
 375
 376
 377 /**
 378  * Create the texture map we'll use for antialiasing the lines.
 379  */
 380 static void
 381 aaline_create_texture(struct aaline_stage *aaline)
 382 {
 383    struct pipe_context *pipe = aaline->pipe;
 384    struct pipe_screen *screen = pipe->screen;
 385    struct pipe_texture texTemp;
 386    uint level;
 387
 388    memset(&texTemp, 0, sizeof(texTemp));
 389    texTemp.target = PIPE_TEXTURE_2D;
 390    texTemp.format = PIPE_FORMAT_U_A8; /* XXX verify supported by driver! */
 391    texTemp.last_level = MAX_TEXTURE_LEVEL;
 392    texTemp.width[0] = 1 << MAX_TEXTURE_LEVEL;
 393    texTemp.height[0] = 1 << MAX_TEXTURE_LEVEL;
 394    texTemp.depth[0] = 1;
 395    texTemp.cpp = 1;
 396
 397    aaline->texture = screen->texture_create(screen, &texTemp);
 398
 399    /* Fill in mipmap images.
 400     * Basically each level is solid opaque, except for the outermost
 401     * texels which are zero.  Special case the 1x1 and 2x2 levels.
 402     */
 403    for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
 404       struct pipe_surface *surface;
 405       const uint size = aaline->texture->width[level];
 406       ubyte *data;
 407       uint i, j;
 408
 409       assert(aaline->texture->width[level] == aaline->texture->height[level]);
 410
 411       surface = screen->get_tex_surface(screen, aaline->texture, 0, level, 0);
 412       data = pipe_surface_map(surface);
 413
 414       for (i = 0; i < size; i++) {
 415          for (j = 0; j < size; j++) {
 416             ubyte d;
 417             if (size == 1) {
 418                d = 255;
 419             }
 420             else if (size == 2) {
 421                d = 200; /* tuneable */
 422             }
 423             else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
 424                d = 0;
 425             }
 426             else {
 427                d = 255;
 428             }
 429             data[i * surface->pitch + j] = d;
 430          }
 431       }
 432
 433       /* unmap */
 434       pipe_surface_unmap(surface);
 435       pipe_surface_reference(&surface, NULL);
 436       pipe->texture_update(pipe, aaline->texture, 0, (1 << level));
 437    }
 438 }
 439
 440
 441 /**
 442  * Create the sampler CSO that'll be used for antialiasing.
 443  * By using a mipmapped texture, we don't have to generate a different
 444  * texture image for each line size.
 445  */
 446 static void
 447 aaline_create_sampler(struct aaline_stage *aaline)
 448 {
 449    struct pipe_sampler_state sampler;
 450    struct pipe_context *pipe = aaline->pipe;
 451
 452    memset(&sampler, 0, sizeof(sampler));
 453    sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 454    sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 455    sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 456    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
 457    sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
 458    sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
 459    sampler.normalized_coords = 1;
 460    sampler.min_lod = 0.0f;
 461    sampler.max_lod = MAX_TEXTURE_LEVEL;
 462
 463    aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 464 }
 465
 466
 467 /**
 468  * When we're about to draw our first AA line in a batch, this function is
 469  * called to tell the driver to bind our modified fragment shader.
 470  */
 471 static void
 472 bind_aaline_fragment_shader(struct aaline_stage *aaline)
 473 {
 474    if (!aaline->fs->aaline_fs) {
 475       generate_aaline_fs(aaline);
 476    }
 477    aaline->driver_bind_fs_state(aaline->pipe, aaline->fs->aaline_fs);
 478 }
 479
 480
 481
 482 static INLINE struct aaline_stage *
 483 aaline_stage( struct draw_stage *stage )
 484 {
 485    return (struct aaline_stage *) stage;
 486 }
 487
 488
 489 static void
 490 passthrough_point(struct draw_stage *stage, struct prim_header *header)
 491 {
 492    stage->next->point(stage->next, header);
 493 }
 494
 495
 496 static void
 497 passthrough_tri(struct draw_stage *stage, struct prim_header *header)
 498 {
 499    stage->next->tri(stage->next, header);
 500 }
 501
 502
 503 /**
 504  * Draw a wide line by drawing a quad, using geometry which will
 505  * fullfill GL's antialiased line requirements.
 506  */
 507 static void
 508 aaline_line(struct draw_stage *stage, struct prim_header *header)
 509 {
 510    const struct aaline_stage *aaline = aaline_stage(stage);
 511    const float half_width = aaline->half_line_width;
 512    struct prim_header tri;
 513    struct vertex_header *v[8];
 514    uint texPos = aaline->tex_slot;
 515    float *pos, *tex;
 516    float dx = header->v[1]->data[0][0] - header->v[0]->data[0][0];
 517    float dy = header->v[1]->data[0][1] - header->v[0]->data[0][1];
 518    double a = atan2(dy, dx);
 519    float c_a = (float) cos(a), s_a = (float) sin(a);
 520    uint i;
 521
 522    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 523    dx = 0.5F * half_width;
 524    dy = half_width;
 525
 526    /* allocate/dup new verts */
 527    for (i = 0; i < 8; i++) {
 528       v[i] = dup_vert(stage, header->v[i/4], i);
 529    }
 530
 531    /*
 532     * Quad strip for line from v0 to v1 (*=endpoints):
 533     *
 534     *  1   3                     5   7
 535     *  +---+---------------------+---+
 536     *  |                             |
 537     *  | *v0                     v1* |
 538     *  |                             |
 539     *  +---+---------------------+---+
 540     *  0   2                     4   6
 541     */
 542
 543    /* new verts */
 544    pos = v[0]->data[0];
 545    pos[0] += (-dx * c_a -  dy * s_a);
 546    pos[1] += (-dx * s_a +  dy * c_a);
 547
 548    pos = v[1]->data[0];
 549    pos[0] += (-dx * c_a - -dy * s_a);
 550    pos[1] += (-dx * s_a + -dy * c_a);
 551
 552    pos = v[2]->data[0];
 553    pos[0] += ( dx * c_a -  dy * s_a);
 554    pos[1] += ( dx * s_a +  dy * c_a);
 555
 556    pos = v[3]->data[0];
 557    pos[0] += ( dx * c_a - -dy * s_a);
 558    pos[1] += ( dx * s_a + -dy * c_a);
 559
 560    pos = v[4]->data[0];
 561    pos[0] += (-dx * c_a -  dy * s_a);
 562    pos[1] += (-dx * s_a +  dy * c_a);
 563
 564    pos = v[5]->data[0];
 565    pos[0] += (-dx * c_a - -dy * s_a);
 566    pos[1] += (-dx * s_a + -dy * c_a);
 567
 568    pos = v[6]->data[0];
 569    pos[0] += ( dx * c_a -  dy * s_a);
 570    pos[1] += ( dx * s_a +  dy * c_a);
 571
 572    pos = v[7]->data[0];
 573    pos[0] += ( dx * c_a - -dy * s_a);
 574    pos[1] += ( dx * s_a + -dy * c_a);
 575
 576    /* new texcoords */
 577    tex = v[0]->data[texPos];
 578    ASSIGN_4V(tex, 0, 0, 0, 1);
 579
 580    tex = v[1]->data[texPos];
 581    ASSIGN_4V(tex, 0, 1, 0, 1);
 582
 583    tex = v[2]->data[texPos];
 584    ASSIGN_4V(tex, .5, 0, 0, 1);
 585
 586    tex = v[3]->data[texPos];
 587    ASSIGN_4V(tex, .5, 1, 0, 1);
 588
 589    tex = v[4]->data[texPos];
 590    ASSIGN_4V(tex, .5, 0, 0, 1);
 591
 592    tex = v[5]->data[texPos];
 593    ASSIGN_4V(tex, .5, 1, 0, 1);
 594
 595    tex = v[6]->data[texPos];
 596    ASSIGN_4V(tex, 1, 0, 0, 1);
 597
 598    tex = v[7]->data[texPos];
 599    ASSIGN_4V(tex, 1, 1, 0, 1);
 600
 601    /* emit 6 tris for the quad strip */
 602    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 603    stage->next->tri( stage->next, &tri );
 604
 605    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 606    stage->next->tri( stage->next, &tri );
 607
 608    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 609    stage->next->tri( stage->next, &tri );
 610
 611    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 612    stage->next->tri( stage->next, &tri );
 613
 614    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 615    stage->next->tri( stage->next, &tri );
 616
 617    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 618    stage->next->tri( stage->next, &tri );
 619 }
 620
 621
 622 static void
 623 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 624 {
 625    auto struct aaline_stage *aaline = aaline_stage(stage);
 626    struct draw_context *draw = stage->draw;
 627    struct pipe_context *pipe = aaline->pipe;
 628    uint num_samplers;
 629
 630    assert(draw->rasterizer->line_smooth);
 631
 632    if (draw->rasterizer->line_width <= 3.0)
 633       aaline->half_line_width = 1.5f;
 634    else
 635       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 636
 637    /*
 638     * Bind (generate) our fragprog, sampler and texture
 639     */
 640    bind_aaline_fragment_shader(aaline);
 641
 642    /* update vertex attrib info */
 643    aaline->tex_slot = draw->num_vs_outputs;
 644    assert(aaline->tex_slot > 0); /* output[0] is vertex pos */
 645
 646    /* advertise the extra post-transformed vertex attribute */
 647    draw->extra_vp_outputs.semantic_name = TGSI_SEMANTIC_GENERIC;
 648    draw->extra_vp_outputs.semantic_index = aaline->fs->generic_attrib;
 649    draw->extra_vp_outputs.slot = aaline->tex_slot;
 650
 651    /* how many samplers? */
 652    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 653    num_samplers = MAX2(aaline->num_textures, aaline->num_samplers);
 654    num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
 655
 656    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 657    pipe_texture_reference(&aaline->state.texture[aaline->fs->sampler_unit],
 658                           aaline->texture);
 659
 660    aaline->driver_bind_sampler_states(pipe, num_samplers, aaline->state.sampler);
 661    aaline->driver_set_sampler_textures(pipe, num_samplers, aaline->state.texture);
 662
 663    /* now really draw first line */
 664    stage->line = aaline_line;
 665    stage->line(stage, header);
 666 }
 667
 668
 669 static void
 670 aaline_flush(struct draw_stage *stage, unsigned flags)
 671 {
 672    struct draw_context *draw = stage->draw;
 673    struct aaline_stage *aaline = aaline_stage(stage);
 674    struct pipe_context *pipe = aaline->pipe;
 675
 676    stage->line = aaline_first_line;
 677    stage->next->flush( stage->next, flags );
 678
 679    /* restore original frag shader */
 680    aaline->driver_bind_fs_state(pipe, aaline->fs->driver_fs);
 681
 682    /* XXX restore original texture, sampler state */
 683    aaline->driver_bind_sampler_states(pipe, aaline->num_samplers,
 684                                       aaline->state.sampler);
 685    aaline->driver_set_sampler_textures(pipe, aaline->num_textures,
 686                                        aaline->state.texture);
 687
 688    draw->extra_vp_outputs.slot = 0;
 689 }
 690
 691
 692 static void
 693 aaline_reset_stipple_counter(struct draw_stage *stage)
 694 {
 695    stage->next->reset_stipple_counter( stage->next );
 696 }
 697
 698
 699 static void
 700 aaline_destroy(struct draw_stage *stage)
 701 {
 702    struct aaline_stage *aaline = aaline_stage(stage);
 703
 704    aaline->pipe->delete_sampler_state(aaline->pipe, aaline->sampler_cso);
 705
 706    pipe_texture_release(&aaline->texture);
 707
 708    draw_free_temp_verts( stage );
 709
 710    FREE( stage );
 711 }
 712
 713
 714 static struct aaline_stage *
 715 draw_aaline_stage(struct draw_context *draw)
 716 {
 717    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 718
 719    draw_alloc_temp_verts( &aaline->stage, 8 );
 720
 721    aaline->stage.draw = draw;
 722    aaline->stage.next = NULL;
 723    aaline->stage.point = passthrough_point;
 724    aaline->stage.line = aaline_first_line;
 725    aaline->stage.tri = passthrough_tri;
 726    aaline->stage.flush = aaline_flush;
 727    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 728    aaline->stage.destroy = aaline_destroy;
 729
 730    return aaline;
 731 }
 732
 733
 734 static struct aaline_stage *
 735 aaline_stage_from_pipe(struct pipe_context *pipe)
 736 {
 737    struct draw_context *draw = (struct draw_context *) pipe->draw;
 738    return aaline_stage(draw->pipeline.aaline);
 739 }
 740
 741
 742 /**
 743  * This function overrides the driver's create_fs_state() function and
 744  * will typically be called by the state tracker.
 745  */
 746 static void *
 747 aaline_create_fs_state(struct pipe_context *pipe,
 748                        const struct pipe_shader_state *fs)
 749 {
 750    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 751    struct aaline_fragment_shader *aafs = CALLOC_STRUCT(aaline_fragment_shader);
 752
 753    if (aafs) {
 754       aafs->state = *fs;
 755
 756       /* pass-through */
 757       aafs->driver_fs = aaline->driver_create_fs_state(aaline->pipe, fs);
 758    }
 759
 760    return aafs;
 761 }
 762
 763
 764 static void
 765 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 766 {
 767    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 768    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 769    /* save current */
 770    aaline->fs = aafs;
 771    /* pass-through */
 772    aaline->driver_bind_fs_state(aaline->pipe,
 773                                 (aafs ? aafs->driver_fs : NULL));
 774 }
 775
 776
 777 static void
 778 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 779 {
 780    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 781    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 782    /* pass-through */
 783    aaline->driver_delete_fs_state(aaline->pipe, aafs->driver_fs);
 784    FREE(aafs);
 785 }
 786
 787
 788 static void
 789 aaline_bind_sampler_states(struct pipe_context *pipe,
 790                            unsigned num, void **sampler)
 791 {
 792    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 793    /* save current */
 794    memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 795    aaline->num_samplers = num;
 796    /* pass-through */
 797    aaline->driver_bind_sampler_states(aaline->pipe, num, sampler);
 798 }
 799
 800
 801 static void
 802 aaline_set_sampler_textures(struct pipe_context *pipe,
 803                             unsigned num, struct pipe_texture **texture)
 804 {
 805    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 806    uint i;
 807
 808    /* save current */
 809    for (i = 0; i < num; i++) {
 810       pipe_texture_reference(&aaline->state.texture[i], texture[i]);
 811    }
 812    aaline->num_textures = num;
 813
 814    /* pass-through */
 815    aaline->driver_set_sampler_textures(aaline->pipe, num, texture);
 816 }
 817
 818
 819 /**
 820  * Called by drivers that want to install this AA line prim stage
 821  * into the draw module's pipeline.  This will not be used if the
 822  * hardware has native support for AA lines.
 823  */
 824 void
 825 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 826 {
 827    struct aaline_stage *aaline;
 828
 829    pipe->draw = (void *) draw;
 830
 831    /*
 832     * Create / install AA line drawing / prim stage
 833     */
 834    aaline = draw_aaline_stage( draw );
 835    assert(aaline);
 836    draw->pipeline.aaline = &aaline->stage;
 837
 838    aaline->pipe = pipe;
 839
 840    /* create special texture, sampler state */
 841    aaline_create_texture(aaline);
 842    aaline_create_sampler(aaline);
 843
 844    /* save original driver functions */
 845    aaline->driver_create_fs_state = pipe->create_fs_state;
 846    aaline->driver_bind_fs_state = pipe->bind_fs_state;
 847    aaline->driver_delete_fs_state = pipe->delete_fs_state;
 848
 849    aaline->driver_bind_sampler_states = pipe->bind_sampler_states;
 850    aaline->driver_set_sampler_textures = pipe->set_sampler_textures;
 851
 852    /* override the driver's functions */
 853    pipe->create_fs_state = aaline_create_fs_state;
 854    pipe->bind_fs_state = aaline_bind_fs_state;
 855    pipe->delete_fs_state = aaline_delete_fs_state;
 856
 857    pipe->bind_sampler_states = aaline_bind_sampler_states;
 858    pipe->set_sampler_textures = aaline_set_sampler_textures;
 859 }