src/gallium/auxiliary/draw/draw_pipe_aaline.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /**
  29  * AA line stage:  AA lines are converted to texture mapped triangles.
  30  *
  31  * Authors:  Brian Paul
  32  */
  33
  34
  35 #include "pipe/p_util.h"
  36 #include "pipe/p_inlines.h"
  37 #include "pipe/p_context.h"
  38 #include "pipe/p_defines.h"
  39 #include "pipe/p_shader_tokens.h"
  40
  41 #include "tgsi/util/tgsi_transform.h"
  42 #include "tgsi/util/tgsi_dump.h"
  43
  44 #include "draw_context.h"
  45 #include "draw_private.h"
  46 #include "draw_pipe.h"
  47
  48
  49 /**
  50  * Max texture level for the alpha texture used for antialiasing
  51  */
  52 #define MAX_TEXTURE_LEVEL  5   /* 32 x 32 */
  53
  54
  55 /**
  56  * Subclass of pipe_shader_state to carry extra fragment shader info.
  57  */
  58 struct aaline_fragment_shader
  59 {
  60    struct pipe_shader_state state;
  61    void *driver_fs;
  62    void *aaline_fs;
  63    void *aapoint_fs; /* not yet */
  64    void *sprite_fs; /* not yet */
  65    uint sampler_unit;
  66    int generic_attrib;  /**< texcoord/generic used for texture */
  67 };
  68
  69
  70 /**
  71  * Subclass of draw_stage
  72  */
  73 struct aaline_stage
  74 {
  75    struct draw_stage stage;
  76
  77    float half_line_width;
  78
  79    /** For AA lines, this is the vertex attrib slot for the new texcoords */
  80    uint tex_slot;
  81
  82    void *sampler_cso;
  83    struct pipe_texture *texture;
  84    uint num_samplers;
  85    uint num_textures;
  86
  87
  88    /*
  89     * Currently bound state
  90     */
  91    struct aaline_fragment_shader *fs;
  92    struct {
  93       void *sampler[PIPE_MAX_SAMPLERS];
  94       struct pipe_texture *texture[PIPE_MAX_SAMPLERS];
  95    } state;
  96
  97    /*
  98     * Driver interface/override functions
  99     */
 100    void * (*driver_create_fs_state)(struct pipe_context *,
 101                                     const struct pipe_shader_state *);
 102    void (*driver_bind_fs_state)(struct pipe_context *, void *);
 103    void (*driver_delete_fs_state)(struct pipe_context *, void *);
 104
 105    void (*driver_bind_sampler_states)(struct pipe_context *, unsigned,
 106                                       void **);
 107    void (*driver_set_sampler_textures)(struct pipe_context *, unsigned,
 108                                        struct pipe_texture **);
 109
 110    struct pipe_context *pipe;
 111 };
 112
 113
 114
 115 /**
 116  * Subclass of tgsi_transform_context, used for transforming the
 117  * user's fragment shader to add the special AA instructions.
 118  */
 119 struct aa_transform_context {
 120    struct tgsi_transform_context base;
 121    uint tempsUsed;  /**< bitmask */
 122    int colorOutput; /**< which output is the primary color */
 123    uint samplersUsed;  /**< bitfield of samplers used */
 124    int freeSampler;  /** an available sampler for the pstipple */
 125    int maxInput, maxGeneric;  /**< max input index found */
 126    int colorTemp, texTemp;  /**< temp registers */
 127    boolean firstInstruction;
 128 };
 129
 130
 131 /**
 132  * TGSI declaration transform callback.
 133  * Look for a free sampler, a free input attrib, and two free temp regs.
 134  */
 135 static void
 136 aa_transform_decl(struct tgsi_transform_context *ctx,
 137                   struct tgsi_full_declaration *decl)
 138 {
 139    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 140
 141    if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
 142        decl->Semantic.SemanticName == TGSI_SEMANTIC_COLOR &&
 143        decl->Semantic.SemanticIndex == 0) {
 144       aactx->colorOutput = decl->u.DeclarationRange.First;
 145    }
 146    else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
 147       uint i;
 148       for (i = decl->u.DeclarationRange.First;
 149            i <= decl->u.DeclarationRange.Last; i++) {
 150          aactx->samplersUsed |= 1 << i;
 151       }
 152    }
 153    else if (decl->Declaration.File == TGSI_FILE_INPUT) {
 154       if ((int) decl->u.DeclarationRange.Last > aactx->maxInput)
 155          aactx->maxInput = decl->u.DeclarationRange.Last;
 156       if (decl->Semantic.SemanticName == TGSI_SEMANTIC_GENERIC &&
 157            (int) decl->Semantic.SemanticIndex > aactx->maxGeneric) {
 158          aactx->maxGeneric = decl->Semantic.SemanticIndex;
 159       }
 160    }
 161    else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
 162       uint i;
 163       for (i = decl->u.DeclarationRange.First;
 164            i <= decl->u.DeclarationRange.Last; i++) {
 165          aactx->tempsUsed |= (1 << i);
 166       }
 167    }
 168
 169    ctx->emit_declaration(ctx, decl);
 170 }
 171
 172
 173 /**
 174  * Find the lowest zero bit in the given word, or -1 if bitfield is all ones.
 175  */
 176 static int
 177 free_bit(uint bitfield)
 178 {
 179    int i;
 180    for (i = 0; i < 32; i++) {
 181       if ((bitfield & (1 << i)) == 0)
 182          return i;
 183    }
 184    return -1;
 185 }
 186
 187
 188 /**
 189  * TGSI instruction transform callback.
 190  * Replace writes to result.color w/ a temp reg.
 191  * Upon END instruction, insert texture sampling code for antialiasing.
 192  */
 193 static void
 194 aa_transform_inst(struct tgsi_transform_context *ctx,
 195                   struct tgsi_full_instruction *inst)
 196 {
 197    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 198
 199    if (aactx->firstInstruction) {
 200       /* emit our new declarations before the first instruction */
 201
 202       struct tgsi_full_declaration decl;
 203       uint i;
 204
 205       /* find free sampler */
 206       aactx->freeSampler = free_bit(aactx->samplersUsed);
 207       if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
 208          aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
 209
 210       /* find two free temp regs */
 211       for (i = 0; i < 32; i++) {
 212          if ((aactx->tempsUsed & (1 << i)) == 0) {
 213             /* found a free temp */
 214             if (aactx->colorTemp < 0)
 215                aactx->colorTemp  = i;
 216             else if (aactx->texTemp < 0)
 217                aactx->texTemp  = i;
 218             else
 219                break;
 220          }
 221       }
 222       assert(aactx->colorTemp >= 0);
 223       assert(aactx->texTemp >= 0);
 224
 225       /* declare new generic input/texcoord */
 226       decl = tgsi_default_full_declaration();
 227       decl.Declaration.File = TGSI_FILE_INPUT;
 228       decl.Declaration.Semantic = 1;
 229       decl.Semantic.SemanticName = TGSI_SEMANTIC_GENERIC;
 230       decl.Semantic.SemanticIndex = aactx->maxGeneric + 1;
 231       decl.Declaration.Interpolate = 1;
 232       /* XXX this could be linear... */
 233       decl.Interpolation.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
 234       decl.u.DeclarationRange.First =
 235       decl.u.DeclarationRange.Last = aactx->maxInput + 1;
 236       ctx->emit_declaration(ctx, &decl);
 237
 238       /* declare new sampler */
 239       decl = tgsi_default_full_declaration();
 240       decl.Declaration.File = TGSI_FILE_SAMPLER;
 241       decl.u.DeclarationRange.First =
 242       decl.u.DeclarationRange.Last = aactx->freeSampler;
 243       ctx->emit_declaration(ctx, &decl);
 244
 245       /* declare new temp regs */
 246       decl = tgsi_default_full_declaration();
 247       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 248       decl.u.DeclarationRange.First =
 249       decl.u.DeclarationRange.Last = aactx->texTemp;
 250       ctx->emit_declaration(ctx, &decl);
 251
 252       decl = tgsi_default_full_declaration();
 253       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 254       decl.u.DeclarationRange.First =
 255       decl.u.DeclarationRange.Last = aactx->colorTemp;
 256       ctx->emit_declaration(ctx, &decl);
 257
 258       aactx->firstInstruction = FALSE;
 259    }
 260
 261    if (inst->Instruction.Opcode == TGSI_OPCODE_END &&
 262        aactx->colorOutput != -1) {
 263       struct tgsi_full_instruction newInst;
 264
 265       /* TEX */
 266       newInst = tgsi_default_full_instruction();
 267       newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
 268       newInst.Instruction.NumDstRegs = 1;
 269       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_TEMPORARY;
 270       newInst.FullDstRegisters[0].DstRegister.Index = aactx->texTemp;
 271       newInst.Instruction.NumSrcRegs = 2;
 272       newInst.InstructionExtTexture.Texture = TGSI_TEXTURE_2D;
 273       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_INPUT;
 274       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->maxInput + 1;
 275       newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_SAMPLER;
 276       newInst.FullSrcRegisters[1].SrcRegister.Index = aactx->freeSampler;
 277
 278       ctx->emit_instruction(ctx, &newInst);
 279
 280       /* MOV rgb */
 281       newInst = tgsi_default_full_instruction();
 282       newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
 283       newInst.Instruction.NumDstRegs = 1;
 284       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_OUTPUT;
 285       newInst.FullDstRegisters[0].DstRegister.Index = aactx->colorOutput;
 286       newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_XYZ;
 287       newInst.Instruction.NumSrcRegs = 1;
 288       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
 289       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->colorTemp;
 290       ctx->emit_instruction(ctx, &newInst);
 291
 292       /* MUL alpha */
 293       newInst = tgsi_default_full_instruction();
 294       newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
 295       newInst.Instruction.NumDstRegs = 1;
 296       newInst.FullDstRegisters[0].DstRegister.File = TGSI_FILE_OUTPUT;
 297       newInst.FullDstRegisters[0].DstRegister.Index = aactx->colorOutput;
 298       newInst.FullDstRegisters[0].DstRegister.WriteMask = TGSI_WRITEMASK_W;
 299       newInst.Instruction.NumSrcRegs = 2;
 300       newInst.FullSrcRegisters[0].SrcRegister.File = TGSI_FILE_TEMPORARY;
 301       newInst.FullSrcRegisters[0].SrcRegister.Index = aactx->colorTemp;
 302       newInst.FullSrcRegisters[1].SrcRegister.File = TGSI_FILE_TEMPORARY;
 303       newInst.FullSrcRegisters[1].SrcRegister.Index = aactx->texTemp;
 304       ctx->emit_instruction(ctx, &newInst);
 305
 306       /* END */
 307       newInst = tgsi_default_full_instruction();
 308       newInst.Instruction.Opcode = TGSI_OPCODE_END;
 309       newInst.Instruction.NumDstRegs = 0;
 310       newInst.Instruction.NumSrcRegs = 0;
 311       ctx->emit_instruction(ctx, &newInst);
 312    }
 313    else {
 314       /* Not an END instruction.
 315        * Look for writes to result.color and replace with colorTemp reg.
 316        */
 317       uint i;
 318
 319       for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 320          struct tgsi_full_dst_register *dst = &inst->FullDstRegisters[i];
 321          if (dst->DstRegister.File == TGSI_FILE_OUTPUT &&
 322              dst->DstRegister.Index == aactx->colorOutput) {
 323             dst->DstRegister.File = TGSI_FILE_TEMPORARY;
 324             dst->DstRegister.Index = aactx->colorTemp;
 325          }
 326       }
 327
 328       ctx->emit_instruction(ctx, inst);
 329    }
 330 }
 331
 332
 333 /**
 334  * Generate the frag shader we'll use for drawing AA lines.
 335  * This will be the user's shader plus some texture/modulate instructions.
 336  */
 337 static boolean
 338 generate_aaline_fs(struct aaline_stage *aaline)
 339 {
 340    const struct pipe_shader_state *orig_fs = &aaline->fs->state;
 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    if (aaline_fs.tokens == NULL)
 349       return FALSE;
 350
 351    memset(&transform, 0, sizeof(transform));
 352    transform.colorOutput = -1;
 353    transform.maxInput = -1;
 354    transform.maxGeneric = -1;
 355    transform.colorTemp = -1;
 356    transform.texTemp = -1;
 357    transform.firstInstruction = TRUE;
 358    transform.base.transform_instruction = aa_transform_inst;
 359    transform.base.transform_declaration = aa_transform_decl;
 360
 361    tgsi_transform_shader(orig_fs->tokens,
 362                          (struct tgsi_token *) aaline_fs.tokens,
 363                          MAX, &transform.base);
 364
 365 #if 0 /* DEBUG */
 366    tgsi_dump(orig_fs->tokens, 0);
 367    tgsi_dump(aaline_fs.tokens, 0);
 368 #endif
 369
 370    aaline->fs->sampler_unit = transform.freeSampler;
 371
 372    aaline->fs->aaline_fs
 373       = aaline->driver_create_fs_state(aaline->pipe, &aaline_fs);
 374    if (aaline->fs->aaline_fs == NULL)
 375       return FALSE;
 376
 377    aaline->fs->generic_attrib = transform.maxGeneric + 1;
 378    return TRUE;
 379 }
 380
 381
 382 /**
 383  * Create the texture map we'll use for antialiasing the lines.
 384  */
 385 static boolean
 386 aaline_create_texture(struct aaline_stage *aaline)
 387 {
 388    struct pipe_context *pipe = aaline->pipe;
 389    struct pipe_screen *screen = pipe->screen;
 390    struct pipe_texture texTemp;
 391    uint level;
 392
 393    memset(&texTemp, 0, sizeof(texTemp));
 394    texTemp.target = PIPE_TEXTURE_2D;
 395    texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
 396    texTemp.last_level = MAX_TEXTURE_LEVEL;
 397    texTemp.width[0] = 1 << MAX_TEXTURE_LEVEL;
 398    texTemp.height[0] = 1 << MAX_TEXTURE_LEVEL;
 399    texTemp.depth[0] = 1;
 400    texTemp.cpp = 1;
 401
 402    aaline->texture = screen->texture_create(screen, &texTemp);
 403    if (!aaline->texture)
 404       return FALSE;
 405
 406    /* Fill in mipmap images.
 407     * Basically each level is solid opaque, except for the outermost
 408     * texels which are zero.  Special case the 1x1 and 2x2 levels.
 409     */
 410    for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
 411       struct pipe_surface *surface;
 412       const uint size = aaline->texture->width[level];
 413       ubyte *data;
 414       uint i, j;
 415
 416       assert(aaline->texture->width[level] == aaline->texture->height[level]);
 417
 418       /* This texture is new, no need to flush.
 419        */
 420       surface = screen->get_tex_surface(screen, aaline->texture, 0, level, 0,
 421                                         PIPE_BUFFER_USAGE_CPU_WRITE);
 422       data = screen->surface_map(screen, surface, PIPE_BUFFER_USAGE_CPU_WRITE);
 423       if (data == NULL)
 424          return FALSE;
 425
 426       for (i = 0; i < size; i++) {
 427          for (j = 0; j < size; j++) {
 428             ubyte d;
 429             if (size == 1) {
 430                d = 255;
 431             }
 432             else if (size == 2) {
 433                d = 200; /* tuneable */
 434             }
 435             else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
 436                d = 0;
 437             }
 438             else {
 439                d = 255;
 440             }
 441             data[i * surface->pitch + j] = d;
 442          }
 443       }
 444
 445       /* unmap */
 446       screen->surface_unmap(screen, surface);
 447       screen->tex_surface_release(screen, &surface);
 448    }
 449    return TRUE;
 450 }
 451
 452
 453 /**
 454  * Create the sampler CSO that'll be used for antialiasing.
 455  * By using a mipmapped texture, we don't have to generate a different
 456  * texture image for each line size.
 457  */
 458 static boolean
 459 aaline_create_sampler(struct aaline_stage *aaline)
 460 {
 461    struct pipe_sampler_state sampler;
 462    struct pipe_context *pipe = aaline->pipe;
 463
 464    memset(&sampler, 0, sizeof(sampler));
 465    sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 466    sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 467    sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 468    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
 469    sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
 470    sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
 471    sampler.normalized_coords = 1;
 472    sampler.min_lod = 0.0f;
 473    sampler.max_lod = MAX_TEXTURE_LEVEL;
 474
 475    aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 476    if (aaline->sampler_cso == NULL)
 477       return FALSE;
 478
 479    return TRUE;
 480 }
 481
 482
 483 /**
 484  * When we're about to draw our first AA line in a batch, this function is
 485  * called to tell the driver to bind our modified fragment shader.
 486  */
 487 static boolean
 488 bind_aaline_fragment_shader(struct aaline_stage *aaline)
 489 {
 490    struct draw_context *draw = aaline->stage.draw;
 491
 492    if (!aaline->fs->aaline_fs &&
 493        !generate_aaline_fs(aaline))
 494       return FALSE;
 495
 496    draw->suspend_flushing = TRUE;
 497    aaline->driver_bind_fs_state(aaline->pipe, aaline->fs->aaline_fs);
 498    draw->suspend_flushing = FALSE;
 499
 500    return TRUE;
 501 }
 502
 503
 504
 505 static INLINE struct aaline_stage *
 506 aaline_stage( struct draw_stage *stage )
 507 {
 508    return (struct aaline_stage *) stage;
 509 }
 510
 511
 512 /**
 513  * Draw a wide line by drawing a quad, using geometry which will
 514  * fullfill GL's antialiased line requirements.
 515  */
 516 static void
 517 aaline_line(struct draw_stage *stage, struct prim_header *header)
 518 {
 519    const struct aaline_stage *aaline = aaline_stage(stage);
 520    const float half_width = aaline->half_line_width;
 521    struct prim_header tri;
 522    struct vertex_header *v[8];
 523    uint texPos = aaline->tex_slot;
 524    float *pos, *tex;
 525    float dx = header->v[1]->data[0][0] - header->v[0]->data[0][0];
 526    float dy = header->v[1]->data[0][1] - header->v[0]->data[0][1];
 527    double a = atan2(dy, dx);
 528    float c_a = (float) cos(a), s_a = (float) sin(a);
 529    uint i;
 530
 531    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 532    dx = 0.5F * half_width;
 533    dy = half_width;
 534
 535    /* allocate/dup new verts */
 536    for (i = 0; i < 8; i++) {
 537       v[i] = dup_vert(stage, header->v[i/4], i);
 538    }
 539
 540    /*
 541     * Quad strip for line from v0 to v1 (*=endpoints):
 542     *
 543     *  1   3                     5   7
 544     *  +---+---------------------+---+
 545     *  |                             |
 546     *  | *v0                     v1* |
 547     *  |                             |
 548     *  +---+---------------------+---+
 549     *  0   2                     4   6
 550     */
 551
 552    /* new verts */
 553    pos = v[0]->data[0];
 554    pos[0] += (-dx * c_a -  dy * s_a);
 555    pos[1] += (-dx * s_a +  dy * c_a);
 556
 557    pos = v[1]->data[0];
 558    pos[0] += (-dx * c_a - -dy * s_a);
 559    pos[1] += (-dx * s_a + -dy * c_a);
 560
 561    pos = v[2]->data[0];
 562    pos[0] += ( dx * c_a -  dy * s_a);
 563    pos[1] += ( dx * s_a +  dy * c_a);
 564
 565    pos = v[3]->data[0];
 566    pos[0] += ( dx * c_a - -dy * s_a);
 567    pos[1] += ( dx * s_a + -dy * c_a);
 568
 569    pos = v[4]->data[0];
 570    pos[0] += (-dx * c_a -  dy * s_a);
 571    pos[1] += (-dx * s_a +  dy * c_a);
 572
 573    pos = v[5]->data[0];
 574    pos[0] += (-dx * c_a - -dy * s_a);
 575    pos[1] += (-dx * s_a + -dy * c_a);
 576
 577    pos = v[6]->data[0];
 578    pos[0] += ( dx * c_a -  dy * s_a);
 579    pos[1] += ( dx * s_a +  dy * c_a);
 580
 581    pos = v[7]->data[0];
 582    pos[0] += ( dx * c_a - -dy * s_a);
 583    pos[1] += ( dx * s_a + -dy * c_a);
 584
 585    /* new texcoords */
 586    tex = v[0]->data[texPos];
 587    ASSIGN_4V(tex, 0, 0, 0, 1);
 588
 589    tex = v[1]->data[texPos];
 590    ASSIGN_4V(tex, 0, 1, 0, 1);
 591
 592    tex = v[2]->data[texPos];
 593    ASSIGN_4V(tex, .5, 0, 0, 1);
 594
 595    tex = v[3]->data[texPos];
 596    ASSIGN_4V(tex, .5, 1, 0, 1);
 597
 598    tex = v[4]->data[texPos];
 599    ASSIGN_4V(tex, .5, 0, 0, 1);
 600
 601    tex = v[5]->data[texPos];
 602    ASSIGN_4V(tex, .5, 1, 0, 1);
 603
 604    tex = v[6]->data[texPos];
 605    ASSIGN_4V(tex, 1, 0, 0, 1);
 606
 607    tex = v[7]->data[texPos];
 608    ASSIGN_4V(tex, 1, 1, 0, 1);
 609
 610    /* emit 6 tris for the quad strip */
 611    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 612    stage->next->tri( stage->next, &tri );
 613
 614    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 615    stage->next->tri( stage->next, &tri );
 616
 617    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 618    stage->next->tri( stage->next, &tri );
 619
 620    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 621    stage->next->tri( stage->next, &tri );
 622
 623    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 624    stage->next->tri( stage->next, &tri );
 625
 626    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 627    stage->next->tri( stage->next, &tri );
 628 }
 629
 630
 631 static void
 632 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 633 {
 634    auto struct aaline_stage *aaline = aaline_stage(stage);
 635    struct draw_context *draw = stage->draw;
 636    struct pipe_context *pipe = aaline->pipe;
 637    uint num_samplers;
 638
 639    assert(draw->rasterizer->line_smooth);
 640
 641    if (draw->rasterizer->line_width <= 3.0)
 642       aaline->half_line_width = 1.5f;
 643    else
 644       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 645
 646    /*
 647     * Bind (generate) our fragprog, sampler and texture
 648     */
 649    if (!bind_aaline_fragment_shader(aaline)) {
 650       stage->line = draw_pipe_passthrough_line;
 651       stage->line(stage, header);
 652       return;
 653    }
 654
 655    /* update vertex attrib info */
 656    aaline->tex_slot = draw->vs.num_vs_outputs;
 657    assert(aaline->tex_slot > 0); /* output[0] is vertex pos */
 658
 659    /* advertise the extra post-transformed vertex attribute */
 660    draw->extra_vp_outputs.semantic_name = TGSI_SEMANTIC_GENERIC;
 661    draw->extra_vp_outputs.semantic_index = aaline->fs->generic_attrib;
 662    draw->extra_vp_outputs.slot = aaline->tex_slot;
 663
 664    /* how many samplers? */
 665    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 666    num_samplers = MAX2(aaline->num_textures, aaline->num_samplers);
 667    num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
 668
 669    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 670    pipe_texture_reference(&aaline->state.texture[aaline->fs->sampler_unit],
 671                           aaline->texture);
 672
 673    draw->suspend_flushing = TRUE;
 674    aaline->driver_bind_sampler_states(pipe, num_samplers, aaline->state.sampler);
 675    aaline->driver_set_sampler_textures(pipe, num_samplers, aaline->state.texture);
 676    draw->suspend_flushing = FALSE;
 677
 678    /* now really draw first line */
 679    stage->line = aaline_line;
 680    stage->line(stage, header);
 681 }
 682
 683
 684 static void
 685 aaline_flush(struct draw_stage *stage, unsigned flags)
 686 {
 687    struct draw_context *draw = stage->draw;
 688    struct aaline_stage *aaline = aaline_stage(stage);
 689    struct pipe_context *pipe = aaline->pipe;
 690
 691    stage->line = aaline_first_line;
 692    stage->next->flush( stage->next, flags );
 693
 694    /* restore original frag shader, texture, sampler state */
 695    draw->suspend_flushing = TRUE;
 696    aaline->driver_bind_fs_state(pipe, aaline->fs->driver_fs);
 697    aaline->driver_bind_sampler_states(pipe, aaline->num_samplers,
 698                                       aaline->state.sampler);
 699    aaline->driver_set_sampler_textures(pipe, aaline->num_textures,
 700                                        aaline->state.texture);
 701    draw->suspend_flushing = FALSE;
 702
 703    draw->extra_vp_outputs.slot = 0;
 704 }
 705
 706
 707 static void
 708 aaline_reset_stipple_counter(struct draw_stage *stage)
 709 {
 710    stage->next->reset_stipple_counter( stage->next );
 711 }
 712
 713
 714 static void
 715 aaline_destroy(struct draw_stage *stage)
 716 {
 717    struct aaline_stage *aaline = aaline_stage(stage);
 718    uint i;
 719
 720    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 721       pipe_texture_reference(&aaline->state.texture[i], NULL);
 722    }
 723
 724    if (aaline->sampler_cso)
 725       aaline->pipe->delete_sampler_state(aaline->pipe, aaline->sampler_cso);
 726
 727    if (aaline->texture)
 728       pipe_texture_release(&aaline->texture);
 729
 730    draw_free_temp_verts( stage );
 731
 732    FREE( stage );
 733 }
 734
 735
 736 static struct aaline_stage *
 737 draw_aaline_stage(struct draw_context *draw)
 738 {
 739    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 740    if (aaline == NULL)
 741       return NULL;
 742
 743    if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
 744       goto fail;
 745
 746    aaline->stage.draw = draw;
 747    aaline->stage.next = NULL;
 748    aaline->stage.point = draw_pipe_passthrough_point;
 749    aaline->stage.line = aaline_first_line;
 750    aaline->stage.tri = draw_pipe_passthrough_tri;
 751    aaline->stage.flush = aaline_flush;
 752    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 753    aaline->stage.destroy = aaline_destroy;
 754
 755    return aaline;
 756
 757  fail:
 758    if (aaline)
 759       aaline_destroy(&aaline->stage);
 760
 761    return NULL;
 762 }
 763
 764
 765 static struct aaline_stage *
 766 aaline_stage_from_pipe(struct pipe_context *pipe)
 767 {
 768    struct draw_context *draw = (struct draw_context *) pipe->draw;
 769    return aaline_stage(draw->pipeline.aaline);
 770 }
 771
 772
 773 /**
 774  * This function overrides the driver's create_fs_state() function and
 775  * will typically be called by the state tracker.
 776  */
 777 static void *
 778 aaline_create_fs_state(struct pipe_context *pipe,
 779                        const struct pipe_shader_state *fs)
 780 {
 781    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 782    struct aaline_fragment_shader *aafs = CALLOC_STRUCT(aaline_fragment_shader);
 783    if (aafs == NULL)
 784       return NULL;
 785
 786    aafs->state = *fs;
 787
 788    /* pass-through */
 789    aafs->driver_fs = aaline->driver_create_fs_state(aaline->pipe, fs);
 790
 791    return aafs;
 792 }
 793
 794
 795 static void
 796 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 797 {
 798    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 799    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 800
 801    /* save current */
 802    aaline->fs = aafs;
 803    /* pass-through */
 804    aaline->driver_bind_fs_state(aaline->pipe,
 805                                 (aafs ? aafs->driver_fs : NULL));
 806 }
 807
 808
 809 static void
 810 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 811 {
 812    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 813    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 814    /* pass-through */
 815    aaline->driver_delete_fs_state(aaline->pipe, aafs->driver_fs);
 816    FREE(aafs);
 817 }
 818
 819
 820 static void
 821 aaline_bind_sampler_states(struct pipe_context *pipe,
 822                            unsigned num, void **sampler)
 823 {
 824    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 825
 826    /* save current */
 827    memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 828    aaline->num_samplers = num;
 829
 830    /* pass-through */
 831    aaline->driver_bind_sampler_states(aaline->pipe, num, sampler);
 832 }
 833
 834
 835 static void
 836 aaline_set_sampler_textures(struct pipe_context *pipe,
 837                             unsigned num, struct pipe_texture **texture)
 838 {
 839    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 840    uint i;
 841
 842    /* save current */
 843    for (i = 0; i < num; i++) {
 844       pipe_texture_reference(&aaline->state.texture[i], texture[i]);
 845    }
 846    for ( ; i < PIPE_MAX_SAMPLERS; i++) {
 847       pipe_texture_reference(&aaline->state.texture[i], NULL);
 848    }
 849    aaline->num_textures = num;
 850
 851    /* pass-through */
 852    aaline->driver_set_sampler_textures(aaline->pipe, num, texture);
 853 }
 854
 855
 856 /**
 857  * Called by drivers that want to install this AA line prim stage
 858  * into the draw module's pipeline.  This will not be used if the
 859  * hardware has native support for AA lines.
 860  */
 861 boolean
 862 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 863 {
 864    struct aaline_stage *aaline;
 865
 866    pipe->draw = (void *) draw;
 867
 868    /*
 869     * Create / install AA line drawing / prim stage
 870     */
 871    aaline = draw_aaline_stage( draw );
 872    if (!aaline)
 873       goto fail;
 874
 875    aaline->pipe = pipe;
 876
 877    /* create special texture, sampler state */
 878    if (!aaline_create_texture(aaline))
 879       goto fail;
 880
 881    if (!aaline_create_sampler(aaline))
 882       goto fail;
 883
 884    /* save original driver functions */
 885    aaline->driver_create_fs_state = pipe->create_fs_state;
 886    aaline->driver_bind_fs_state = pipe->bind_fs_state;
 887    aaline->driver_delete_fs_state = pipe->delete_fs_state;
 888
 889    aaline->driver_bind_sampler_states = pipe->bind_sampler_states;
 890    aaline->driver_set_sampler_textures = pipe->set_sampler_textures;
 891
 892    /* override the driver's functions */
 893    pipe->create_fs_state = aaline_create_fs_state;
 894    pipe->bind_fs_state = aaline_bind_fs_state;
 895    pipe->delete_fs_state = aaline_delete_fs_state;
 896
 897    pipe->bind_sampler_states = aaline_bind_sampler_states;
 898    pipe->set_sampler_textures = aaline_set_sampler_textures;
 899
 900    /* Install once everything is known to be OK:
 901     */
 902    draw->pipeline.aaline = &aaline->stage;
 903
 904    return TRUE;
 905
 906  fail:
 907    if (aaline)
 908       aaline->stage.destroy( &aaline->stage );
 909
 910    return FALSE;
 911 }