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  * Size for the alpha texture used for antialiasing
  59  */
  60 #define TEXTURE_SIZE_LOG2  5   /* 32 x 32 */
  61
  62 /**
  63  * Max texture level for the alpha texture used for antialiasing
  64  *
  65  * Don't use the 1x1 and 2x2 mipmap levels.
  66  */
  67 #define MAX_TEXTURE_LEVEL  (TEXTURE_SIZE_LOG2 - 2)
  68
  69
  70 /**
  71  * Subclass of pipe_shader_state to carry extra fragment shader info.
  72  */
  73 struct aaline_fragment_shader
  74 {
  75    struct pipe_shader_state state;
  76    void *driver_fs;
  77    void *aaline_fs;
  78    uint sampler_unit;
  79    int generic_attrib;  /**< texcoord/generic used for texture */
  80 };
  81
  82
  83 /**
  84  * Subclass of draw_stage
  85  */
  86 struct aaline_stage
  87 {
  88    struct draw_stage stage;
  89
  90    float half_line_width;
  91
  92    /** For AA lines, this is the vertex attrib slot for the new texcoords */
  93    uint tex_slot;
  94    /** position, not necessarily output zero */
  95    uint pos_slot;
  96
  97    void *sampler_cso;
  98    struct pipe_resource *texture;
  99    struct pipe_sampler_view *sampler_view;
 100    uint num_samplers;
 101    uint num_sampler_views;
 102
 103
 104    /*
 105     * Currently bound state
 106     */
 107    struct aaline_fragment_shader *fs;
 108    struct {
 109       void *sampler[PIPE_MAX_SAMPLERS];
 110       struct pipe_sampler_view *sampler_views[PIPE_MAX_SHADER_SAMPLER_VIEWS];
 111    } state;
 112
 113    /*
 114     * Driver interface/override functions
 115     */
 116    void * (*driver_create_fs_state)(struct pipe_context *,
 117                                     const struct pipe_shader_state *);
 118    void (*driver_bind_fs_state)(struct pipe_context *, void *);
 119    void (*driver_delete_fs_state)(struct pipe_context *, void *);
 120
 121    void (*driver_bind_fragment_sampler_states)(struct pipe_context *, unsigned,
 122                                                void **);
 123
 124    void (*driver_set_sampler_views)(struct pipe_context *,
 125                                     unsigned,
 126                                     struct pipe_sampler_view **);
 127 };
 128
 129
 130
 131 /**
 132  * Subclass of tgsi_transform_context, used for transforming the
 133  * user's fragment shader to add the special AA instructions.
 134  */
 135 struct aa_transform_context {
 136    struct tgsi_transform_context base;
 137    uint tempsUsed;  /**< bitmask */
 138    int colorOutput; /**< which output is the primary color */
 139    uint samplersUsed;  /**< bitfield of samplers used */
 140    int freeSampler;  /** an available sampler for the pstipple */
 141    int maxInput, maxGeneric;  /**< max input index found */
 142    int colorTemp, texTemp;  /**< temp registers */
 143    boolean firstInstruction;
 144 };
 145
 146
 147 /**
 148  * TGSI declaration transform callback.
 149  * Look for a free sampler, a free input attrib, and two free temp regs.
 150  */
 151 static void
 152 aa_transform_decl(struct tgsi_transform_context *ctx,
 153                   struct tgsi_full_declaration *decl)
 154 {
 155    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 156
 157    if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
 158        decl->Semantic.Name == TGSI_SEMANTIC_COLOR &&
 159        decl->Semantic.Index == 0) {
 160       aactx->colorOutput = decl->Range.First;
 161    }
 162    else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
 163       uint i;
 164       for (i = decl->Range.First;
 165            i <= decl->Range.Last; i++) {
 166          aactx->samplersUsed |= 1 << i;
 167       }
 168    }
 169    else if (decl->Declaration.File == TGSI_FILE_INPUT) {
 170       if ((int) decl->Range.Last > aactx->maxInput)
 171          aactx->maxInput = decl->Range.Last;
 172       if (decl->Semantic.Name == TGSI_SEMANTIC_GENERIC &&
 173            (int) decl->Semantic.Index > aactx->maxGeneric) {
 174          aactx->maxGeneric = decl->Semantic.Index;
 175       }
 176    }
 177    else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
 178       uint i;
 179       for (i = decl->Range.First;
 180            i <= decl->Range.Last; i++) {
 181          aactx->tempsUsed |= (1 << i);
 182       }
 183    }
 184
 185    ctx->emit_declaration(ctx, decl);
 186 }
 187
 188
 189 /**
 190  * Find the lowest zero bit in the given word, or -1 if bitfield is all ones.
 191  */
 192 static int
 193 free_bit(uint bitfield)
 194 {
 195    return ffs(~bitfield) - 1;
 196 }
 197
 198
 199 /**
 200  * TGSI instruction transform callback.
 201  * Replace writes to result.color w/ a temp reg.
 202  * Upon END instruction, insert texture sampling code for antialiasing.
 203  */
 204 static void
 205 aa_transform_inst(struct tgsi_transform_context *ctx,
 206                   struct tgsi_full_instruction *inst)
 207 {
 208    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
 209
 210    if (aactx->firstInstruction) {
 211       /* emit our new declarations before the first instruction */
 212
 213       struct tgsi_full_declaration decl;
 214       uint i;
 215
 216       /* find free sampler */
 217       aactx->freeSampler = free_bit(aactx->samplersUsed);
 218       if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
 219          aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
 220
 221       /* find two free temp regs */
 222       for (i = 0; i < 32; i++) {
 223          if ((aactx->tempsUsed & (1 << i)) == 0) {
 224             /* found a free temp */
 225             if (aactx->colorTemp < 0)
 226                aactx->colorTemp  = i;
 227             else if (aactx->texTemp < 0)
 228                aactx->texTemp  = i;
 229             else
 230                break;
 231          }
 232       }
 233       assert(aactx->colorTemp >= 0);
 234       assert(aactx->texTemp >= 0);
 235
 236       /* declare new generic input/texcoord */
 237       decl = tgsi_default_full_declaration();
 238       decl.Declaration.File = TGSI_FILE_INPUT;
 239       /* XXX this could be linear... */
 240       decl.Declaration.Interpolate = 1;
 241       decl.Declaration.Semantic = 1;
 242       decl.Semantic.Name = TGSI_SEMANTIC_GENERIC;
 243       decl.Semantic.Index = aactx->maxGeneric + 1;
 244       decl.Range.First =
 245       decl.Range.Last = aactx->maxInput + 1;
 246       decl.Interp.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
 247       ctx->emit_declaration(ctx, &decl);
 248
 249       /* declare new sampler */
 250       decl = tgsi_default_full_declaration();
 251       decl.Declaration.File = TGSI_FILE_SAMPLER;
 252       decl.Range.First =
 253       decl.Range.Last = aactx->freeSampler;
 254       ctx->emit_declaration(ctx, &decl);
 255
 256       /* declare new temp regs */
 257       decl = tgsi_default_full_declaration();
 258       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 259       decl.Range.First =
 260       decl.Range.Last = aactx->texTemp;
 261       ctx->emit_declaration(ctx, &decl);
 262
 263       decl = tgsi_default_full_declaration();
 264       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 265       decl.Range.First =
 266       decl.Range.Last = aactx->colorTemp;
 267       ctx->emit_declaration(ctx, &decl);
 268
 269       aactx->firstInstruction = FALSE;
 270    }
 271
 272    if (inst->Instruction.Opcode == TGSI_OPCODE_END &&
 273        aactx->colorOutput != -1) {
 274       struct tgsi_full_instruction newInst;
 275
 276       /* TEX */
 277       newInst = tgsi_default_full_instruction();
 278       newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
 279       newInst.Instruction.NumDstRegs = 1;
 280       newInst.Dst[0].Register.File = TGSI_FILE_TEMPORARY;
 281       newInst.Dst[0].Register.Index = aactx->texTemp;
 282       newInst.Instruction.NumSrcRegs = 2;
 283       newInst.Instruction.Texture = TRUE;
 284       newInst.Texture.Texture = TGSI_TEXTURE_2D;
 285       newInst.Src[0].Register.File = TGSI_FILE_INPUT;
 286       newInst.Src[0].Register.Index = aactx->maxInput + 1;
 287       newInst.Src[1].Register.File = TGSI_FILE_SAMPLER;
 288       newInst.Src[1].Register.Index = aactx->freeSampler;
 289
 290       ctx->emit_instruction(ctx, &newInst);
 291
 292       /* MOV rgb */
 293       newInst = tgsi_default_full_instruction();
 294       newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
 295       newInst.Instruction.NumDstRegs = 1;
 296       newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
 297       newInst.Dst[0].Register.Index = aactx->colorOutput;
 298       newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_XYZ;
 299       newInst.Instruction.NumSrcRegs = 1;
 300       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 301       newInst.Src[0].Register.Index = aactx->colorTemp;
 302       ctx->emit_instruction(ctx, &newInst);
 303
 304       /* MUL alpha */
 305       newInst = tgsi_default_full_instruction();
 306       newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
 307       newInst.Instruction.NumDstRegs = 1;
 308       newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
 309       newInst.Dst[0].Register.Index = aactx->colorOutput;
 310       newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_W;
 311       newInst.Instruction.NumSrcRegs = 2;
 312       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 313       newInst.Src[0].Register.Index = aactx->colorTemp;
 314       newInst.Src[1].Register.File = TGSI_FILE_TEMPORARY;
 315       newInst.Src[1].Register.Index = aactx->texTemp;
 316       ctx->emit_instruction(ctx, &newInst);
 317
 318       /* END */
 319       newInst = tgsi_default_full_instruction();
 320       newInst.Instruction.Opcode = TGSI_OPCODE_END;
 321       newInst.Instruction.NumDstRegs = 0;
 322       newInst.Instruction.NumSrcRegs = 0;
 323       ctx->emit_instruction(ctx, &newInst);
 324    }
 325    else {
 326       /* Not an END instruction.
 327        * Look for writes to result.color and replace with colorTemp reg.
 328        */
 329       uint i;
 330
 331       for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 332          struct tgsi_full_dst_register *dst = &inst->Dst[i];
 333          if (dst->Register.File == TGSI_FILE_OUTPUT &&
 334              dst->Register.Index == aactx->colorOutput) {
 335             dst->Register.File = TGSI_FILE_TEMPORARY;
 336             dst->Register.Index = aactx->colorTemp;
 337          }
 338       }
 339
 340       ctx->emit_instruction(ctx, inst);
 341    }
 342 }
 343
 344
 345 /**
 346  * Generate the frag shader we'll use for drawing AA lines.
 347  * This will be the user's shader plus some texture/modulate instructions.
 348  */
 349 static boolean
 350 generate_aaline_fs(struct aaline_stage *aaline)
 351 {
 352    struct pipe_context *pipe = aaline->stage.draw->pipe;
 353    const struct pipe_shader_state *orig_fs = &aaline->fs->state;
 354    struct pipe_shader_state aaline_fs;
 355    struct aa_transform_context transform;
 356    const uint newLen = tgsi_num_tokens(orig_fs->tokens) + NUM_NEW_TOKENS;
 357
 358    aaline_fs = *orig_fs; /* copy to init */
 359    aaline_fs.tokens = tgsi_alloc_tokens(newLen);
 360    if (aaline_fs.tokens == NULL)
 361       return FALSE;
 362
 363    memset(&transform, 0, sizeof(transform));
 364    transform.colorOutput = -1;
 365    transform.maxInput = -1;
 366    transform.maxGeneric = -1;
 367    transform.colorTemp = -1;
 368    transform.texTemp = -1;
 369    transform.firstInstruction = TRUE;
 370    transform.base.transform_instruction = aa_transform_inst;
 371    transform.base.transform_declaration = aa_transform_decl;
 372
 373    tgsi_transform_shader(orig_fs->tokens,
 374                          (struct tgsi_token *) aaline_fs.tokens,
 375                          newLen, &transform.base);
 376
 377 #if 0 /* DEBUG */
 378    debug_printf("draw_aaline, orig shader:\n");
 379    tgsi_dump(orig_fs->tokens, 0);
 380    debug_printf("draw_aaline, new shader:\n");
 381    tgsi_dump(aaline_fs.tokens, 0);
 382 #endif
 383
 384    aaline->fs->sampler_unit = transform.freeSampler;
 385
 386    aaline->fs->aaline_fs = aaline->driver_create_fs_state(pipe, &aaline_fs);
 387    if (aaline->fs->aaline_fs == NULL)
 388       goto fail;
 389
 390    aaline->fs->generic_attrib = transform.maxGeneric + 1;
 391    FREE((void *)aaline_fs.tokens);
 392    return TRUE;
 393
 394 fail:
 395    FREE((void *)aaline_fs.tokens);
 396    return FALSE;
 397 }
 398
 399
 400 /**
 401  * Create the texture map we'll use for antialiasing the lines.
 402  */
 403 static boolean
 404 aaline_create_texture(struct aaline_stage *aaline)
 405 {
 406    struct pipe_context *pipe = aaline->stage.draw->pipe;
 407    struct pipe_screen *screen = pipe->screen;
 408    struct pipe_resource texTemp;
 409    struct pipe_sampler_view viewTempl;
 410    uint level;
 411
 412    memset(&texTemp, 0, sizeof(texTemp));
 413    texTemp.target = PIPE_TEXTURE_2D;
 414    texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
 415    texTemp.last_level = MAX_TEXTURE_LEVEL;
 416    texTemp.width0 = 1 << TEXTURE_SIZE_LOG2;
 417    texTemp.height0 = 1 << TEXTURE_SIZE_LOG2;
 418    texTemp.depth0 = 1;
 419    texTemp.array_size = 1;
 420    texTemp.bind = PIPE_BIND_SAMPLER_VIEW;
 421
 422    aaline->texture = screen->resource_create(screen, &texTemp);
 423    if (!aaline->texture)
 424       return FALSE;
 425
 426    u_sampler_view_default_template(&viewTempl,
 427                                    aaline->texture,
 428                                    aaline->texture->format);
 429    aaline->sampler_view = pipe->create_sampler_view(pipe,
 430                                                     aaline->texture,
 431                                                     &viewTempl);
 432    if (!aaline->sampler_view) {
 433       return FALSE;
 434    }
 435
 436    /* Fill in mipmap images.
 437     * Basically each level is solid opaque, except for the outermost
 438     * texels which are zero.  Special case the 1x1 and 2x2 levels
 439     * (though, those levels shouldn't be used - see the max_lod setting).
 440     */
 441    for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
 442       struct pipe_transfer *transfer;
 443       struct pipe_box box;
 444       const uint size = u_minify(aaline->texture->width0, level);
 445       ubyte *data;
 446       uint i, j;
 447
 448       assert(aaline->texture->width0 == aaline->texture->height0);
 449
 450       u_box_origin_2d( size, size, &box );
 451
 452       /* This texture is new, no need to flush.
 453        */
 454       data = pipe->transfer_map(pipe,
 455                                 aaline->texture,
 456                                 level,
 457                                 PIPE_TRANSFER_WRITE,
 458                                 &box, &transfer);
 459
 460       if (data == NULL)
 461          return FALSE;
 462
 463       for (i = 0; i < size; i++) {
 464          for (j = 0; j < size; j++) {
 465             ubyte d;
 466             if (size == 1) {
 467                d = 255;
 468             }
 469             else if (size == 2) {
 470                d = 200; /* tuneable */
 471             }
 472             else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
 473                d = 35;  /* edge texel */
 474             }
 475             else {
 476                d = 255;
 477             }
 478             data[i * transfer->stride + j] = d;
 479          }
 480       }
 481
 482       /* unmap */
 483       pipe->transfer_unmap(pipe, transfer);
 484    }
 485    return TRUE;
 486 }
 487
 488
 489 /**
 490  * Create the sampler CSO that'll be used for antialiasing.
 491  * By using a mipmapped texture, we don't have to generate a different
 492  * texture image for each line size.
 493  */
 494 static boolean
 495 aaline_create_sampler(struct aaline_stage *aaline)
 496 {
 497    struct pipe_sampler_state sampler;
 498    struct pipe_context *pipe = aaline->stage.draw->pipe;
 499
 500    memset(&sampler, 0, sizeof(sampler));
 501    sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 502    sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 503    sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 504    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
 505    sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
 506    sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
 507    sampler.normalized_coords = 1;
 508    sampler.min_lod = 0.0f;
 509    sampler.max_lod = MAX_TEXTURE_LEVEL;
 510
 511    aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 512    if (aaline->sampler_cso == NULL)
 513       return FALSE;
 514
 515    return TRUE;
 516 }
 517
 518
 519 /**
 520  * When we're about to draw our first AA line in a batch, this function is
 521  * called to tell the driver to bind our modified fragment shader.
 522  */
 523 static boolean
 524 bind_aaline_fragment_shader(struct aaline_stage *aaline)
 525 {
 526    struct draw_context *draw = aaline->stage.draw;
 527    struct pipe_context *pipe = draw->pipe;
 528
 529    if (!aaline->fs->aaline_fs &&
 530        !generate_aaline_fs(aaline))
 531       return FALSE;
 532
 533    draw->suspend_flushing = TRUE;
 534    aaline->driver_bind_fs_state(pipe, aaline->fs->aaline_fs);
 535    draw->suspend_flushing = FALSE;
 536
 537    return TRUE;
 538 }
 539
 540
 541
 542 static INLINE struct aaline_stage *
 543 aaline_stage( struct draw_stage *stage )
 544 {
 545    return (struct aaline_stage *) stage;
 546 }
 547
 548
 549 /**
 550  * Draw a wide line by drawing a quad, using geometry which will
 551  * fullfill GL's antialiased line requirements.
 552  */
 553 static void
 554 aaline_line(struct draw_stage *stage, struct prim_header *header)
 555 {
 556    const struct aaline_stage *aaline = aaline_stage(stage);
 557    const float half_width = aaline->half_line_width;
 558    struct prim_header tri;
 559    struct vertex_header *v[8];
 560    uint texPos = aaline->tex_slot;
 561    uint posPos = aaline->pos_slot;
 562    float *pos, *tex;
 563    float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
 564    float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
 565    double a = atan2(dy, dx);
 566    float c_a = (float) cos(a), s_a = (float) sin(a);
 567    uint i;
 568
 569    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 570    dx = 0.5F * half_width;
 571    dy = half_width;
 572
 573    /* allocate/dup new verts */
 574    for (i = 0; i < 8; i++) {
 575       v[i] = dup_vert(stage, header->v[i/4], i);
 576    }
 577
 578    /*
 579     * Quad strip for line from v0 to v1 (*=endpoints):
 580     *
 581     *  1   3                     5   7
 582     *  +---+---------------------+---+
 583     *  |                             |
 584     *  | *v0                     v1* |
 585     *  |                             |
 586     *  +---+---------------------+---+
 587     *  0   2                     4   6
 588     */
 589
 590    /* new verts */
 591    pos = v[0]->data[posPos];
 592    pos[0] += (-dx * c_a -  dy * s_a);
 593    pos[1] += (-dx * s_a +  dy * c_a);
 594
 595    pos = v[1]->data[posPos];
 596    pos[0] += (-dx * c_a - -dy * s_a);
 597    pos[1] += (-dx * s_a + -dy * c_a);
 598
 599    pos = v[2]->data[posPos];
 600    pos[0] += ( dx * c_a -  dy * s_a);
 601    pos[1] += ( dx * s_a +  dy * c_a);
 602
 603    pos = v[3]->data[posPos];
 604    pos[0] += ( dx * c_a - -dy * s_a);
 605    pos[1] += ( dx * s_a + -dy * c_a);
 606
 607    pos = v[4]->data[posPos];
 608    pos[0] += (-dx * c_a -  dy * s_a);
 609    pos[1] += (-dx * s_a +  dy * c_a);
 610
 611    pos = v[5]->data[posPos];
 612    pos[0] += (-dx * c_a - -dy * s_a);
 613    pos[1] += (-dx * s_a + -dy * c_a);
 614
 615    pos = v[6]->data[posPos];
 616    pos[0] += ( dx * c_a -  dy * s_a);
 617    pos[1] += ( dx * s_a +  dy * c_a);
 618
 619    pos = v[7]->data[posPos];
 620    pos[0] += ( dx * c_a - -dy * s_a);
 621    pos[1] += ( dx * s_a + -dy * c_a);
 622
 623    /* new texcoords */
 624    tex = v[0]->data[texPos];
 625    ASSIGN_4V(tex, 0, 0, 0, 1);
 626
 627    tex = v[1]->data[texPos];
 628    ASSIGN_4V(tex, 0, 1, 0, 1);
 629
 630    tex = v[2]->data[texPos];
 631    ASSIGN_4V(tex, .5, 0, 0, 1);
 632
 633    tex = v[3]->data[texPos];
 634    ASSIGN_4V(tex, .5, 1, 0, 1);
 635
 636    tex = v[4]->data[texPos];
 637    ASSIGN_4V(tex, .5, 0, 0, 1);
 638
 639    tex = v[5]->data[texPos];
 640    ASSIGN_4V(tex, .5, 1, 0, 1);
 641
 642    tex = v[6]->data[texPos];
 643    ASSIGN_4V(tex, 1, 0, 0, 1);
 644
 645    tex = v[7]->data[texPos];
 646    ASSIGN_4V(tex, 1, 1, 0, 1);
 647
 648    /* emit 6 tris for the quad strip */
 649    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 650    stage->next->tri( stage->next, &tri );
 651
 652    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 653    stage->next->tri( stage->next, &tri );
 654
 655    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 656    stage->next->tri( stage->next, &tri );
 657
 658    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 659    stage->next->tri( stage->next, &tri );
 660
 661    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 662    stage->next->tri( stage->next, &tri );
 663
 664    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 665    stage->next->tri( stage->next, &tri );
 666 }
 667
 668
 669 static void
 670 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 671 {
 672    auto struct aaline_stage *aaline = aaline_stage(stage);
 673    struct draw_context *draw = stage->draw;
 674    struct pipe_context *pipe = draw->pipe;
 675    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 676    uint num_samplers;
 677    void *r;
 678
 679    assert(draw->rasterizer->line_smooth);
 680
 681    if (draw->rasterizer->line_width <= 2.2)
 682       aaline->half_line_width = 1.1f;
 683    else
 684       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 685
 686    /*
 687     * Bind (generate) our fragprog, sampler and texture
 688     */
 689    if (!bind_aaline_fragment_shader(aaline)) {
 690       stage->line = draw_pipe_passthrough_line;
 691       stage->line(stage, header);
 692       return;
 693    }
 694
 695    draw_aaline_prepare_outputs(draw, draw->pipeline.aaline);
 696
 697    /* how many samplers? */
 698    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 699    num_samplers = MAX2(aaline->num_sampler_views, aaline->num_samplers);
 700    num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
 701
 702    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 703    pipe_sampler_view_reference(&aaline->state.sampler_views[aaline->fs->sampler_unit],
 704                                aaline->sampler_view);
 705
 706    draw->suspend_flushing = TRUE;
 707    aaline->driver_bind_fragment_sampler_states(pipe, num_samplers, aaline->state.sampler);
 708    aaline->driver_set_sampler_views(pipe, num_samplers, aaline->state.sampler_views);
 709
 710    /* Disable triangle culling, stippling, unfilled mode etc. */
 711    r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
 712    pipe->bind_rasterizer_state(pipe, r);
 713
 714    draw->suspend_flushing = FALSE;
 715
 716    /* now really draw first line */
 717    stage->line = aaline_line;
 718    stage->line(stage, header);
 719 }
 720
 721
 722 static void
 723 aaline_flush(struct draw_stage *stage, unsigned flags)
 724 {
 725    struct draw_context *draw = stage->draw;
 726    struct aaline_stage *aaline = aaline_stage(stage);
 727    struct pipe_context *pipe = draw->pipe;
 728
 729    stage->line = aaline_first_line;
 730    stage->next->flush( stage->next, flags );
 731
 732    /* restore original frag shader, texture, sampler state */
 733    draw->suspend_flushing = TRUE;
 734    aaline->driver_bind_fs_state(pipe, aaline->fs ? aaline->fs->driver_fs : NULL);
 735    aaline->driver_bind_fragment_sampler_states(pipe, aaline->num_samplers,
 736                                                aaline->state.sampler);
 737    aaline->driver_set_sampler_views(pipe,
 738                                     aaline->num_sampler_views,
 739                                     aaline->state.sampler_views);
 740
 741    /* restore original rasterizer state */
 742    if (draw->rast_handle) {
 743       pipe->bind_rasterizer_state(pipe, draw->rast_handle);
 744    }
 745
 746    draw->suspend_flushing = FALSE;
 747
 748    draw_remove_extra_vertex_attribs(draw);
 749 }
 750
 751
 752 static void
 753 aaline_reset_stipple_counter(struct draw_stage *stage)
 754 {
 755    stage->next->reset_stipple_counter( stage->next );
 756 }
 757
 758
 759 static void
 760 aaline_destroy(struct draw_stage *stage)
 761 {
 762    struct aaline_stage *aaline = aaline_stage(stage);
 763    struct pipe_context *pipe = stage->draw->pipe;
 764    uint i;
 765
 766    for (i = 0; i < PIPE_MAX_SHADER_SAMPLER_VIEWS; i++) {
 767       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 768    }
 769
 770    if (aaline->sampler_cso)
 771       pipe->delete_sampler_state(pipe, aaline->sampler_cso);
 772
 773    if (aaline->texture)
 774       pipe_resource_reference(&aaline->texture, NULL);
 775
 776    if (aaline->sampler_view) {
 777       pipe_sampler_view_reference(&aaline->sampler_view, NULL);
 778    }
 779
 780    draw_free_temp_verts( stage );
 781
 782    /* restore the old entry points */
 783    pipe->create_fs_state = aaline->driver_create_fs_state;
 784    pipe->bind_fs_state = aaline->driver_bind_fs_state;
 785    pipe->delete_fs_state = aaline->driver_delete_fs_state;
 786
 787    pipe->bind_fragment_sampler_states = aaline->driver_bind_fragment_sampler_states;
 788    pipe->set_fragment_sampler_views = aaline->driver_set_sampler_views;
 789
 790    FREE( stage );
 791 }
 792
 793
 794 static struct aaline_stage *
 795 draw_aaline_stage(struct draw_context *draw)
 796 {
 797    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 798    if (aaline == NULL)
 799       return NULL;
 800
 801    aaline->stage.draw = draw;
 802    aaline->stage.name = "aaline";
 803    aaline->stage.next = NULL;
 804    aaline->stage.point = draw_pipe_passthrough_point;
 805    aaline->stage.line = aaline_first_line;
 806    aaline->stage.tri = draw_pipe_passthrough_tri;
 807    aaline->stage.flush = aaline_flush;
 808    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 809    aaline->stage.destroy = aaline_destroy;
 810
 811    if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
 812       goto fail;
 813
 814    return aaline;
 815
 816  fail:
 817    if (aaline)
 818       aaline->stage.destroy(&aaline->stage);
 819
 820    return NULL;
 821 }
 822
 823
 824 static struct aaline_stage *
 825 aaline_stage_from_pipe(struct pipe_context *pipe)
 826 {
 827    struct draw_context *draw = (struct draw_context *) pipe->draw;
 828
 829    if (draw) {
 830       return aaline_stage(draw->pipeline.aaline);
 831    } else {
 832       return NULL;
 833    }
 834 }
 835
 836
 837 /**
 838  * This function overrides the driver's create_fs_state() function and
 839  * will typically be called by the state tracker.
 840  */
 841 static void *
 842 aaline_create_fs_state(struct pipe_context *pipe,
 843                        const struct pipe_shader_state *fs)
 844 {
 845    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 846    struct aaline_fragment_shader *aafs = NULL;
 847
 848    if (aaline == NULL)
 849       return NULL;
 850
 851    aafs = CALLOC_STRUCT(aaline_fragment_shader);
 852
 853    if (aafs == NULL)
 854       return NULL;
 855
 856    aafs->state.tokens = tgsi_dup_tokens(fs->tokens);
 857
 858    /* pass-through */
 859    aafs->driver_fs = aaline->driver_create_fs_state(pipe, fs);
 860
 861    return aafs;
 862 }
 863
 864
 865 static void
 866 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 867 {
 868    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 869    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 870
 871    if (aaline == NULL) {
 872       return;
 873    }
 874
 875    /* save current */
 876    aaline->fs = aafs;
 877    /* pass-through */
 878    aaline->driver_bind_fs_state(pipe, (aafs ? aafs->driver_fs : NULL));
 879 }
 880
 881
 882 static void
 883 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 884 {
 885    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 886    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 887
 888    if (aafs == NULL) {
 889       return;
 890    }
 891
 892    if (aaline != NULL) {
 893       /* pass-through */
 894       aaline->driver_delete_fs_state(pipe, aafs->driver_fs);
 895
 896       if (aafs->aaline_fs)
 897          aaline->driver_delete_fs_state(pipe, aafs->aaline_fs);
 898    }
 899
 900    FREE((void*)aafs->state.tokens);
 901    FREE(aafs);
 902 }
 903
 904
 905 static void
 906 aaline_bind_fragment_sampler_states(struct pipe_context *pipe,
 907                                     unsigned num, void **sampler)
 908 {
 909    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 910
 911    if (aaline == NULL) {
 912       return;
 913    }
 914
 915    /* save current */
 916    memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 917    aaline->num_samplers = num;
 918
 919    /* pass-through */
 920    aaline->driver_bind_fragment_sampler_states(pipe, num, sampler);
 921 }
 922
 923
 924 static void
 925 aaline_set_sampler_views(struct pipe_context *pipe,
 926                          unsigned num,
 927                          struct pipe_sampler_view **views)
 928 {
 929    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 930    uint i;
 931
 932    if (aaline == NULL) {
 933       return;
 934    }
 935
 936    /* save current */
 937    for (i = 0; i < num; i++) {
 938       pipe_sampler_view_reference(&aaline->state.sampler_views[i], views[i]);
 939    }
 940    for ( ; i < PIPE_MAX_SHADER_SAMPLER_VIEWS; i++) {
 941       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 942    }
 943    aaline->num_sampler_views = num;
 944
 945    /* pass-through */
 946    aaline->driver_set_sampler_views(pipe, num, views);
 947 }
 948
 949
 950 void
 951 draw_aaline_prepare_outputs(struct draw_context *draw,
 952                             struct draw_stage *stage)
 953 {
 954    struct aaline_stage *aaline = aaline_stage(stage);
 955    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 956
 957    /* update vertex attrib info */
 958    aaline->pos_slot = draw_current_shader_position_output(draw);;
 959
 960    if (!rast->line_smooth)
 961       return;
 962
 963    /* allocate the extra post-transformed vertex attribute */
 964    aaline->tex_slot = draw_alloc_extra_vertex_attrib(draw,
 965                                                      TGSI_SEMANTIC_GENERIC,
 966                                                      aaline->fs->generic_attrib);
 967 }
 968
 969 /**
 970  * Called by drivers that want to install this AA line prim stage
 971  * into the draw module's pipeline.  This will not be used if the
 972  * hardware has native support for AA lines.
 973  */
 974 boolean
 975 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 976 {
 977    struct aaline_stage *aaline;
 978
 979    pipe->draw = (void *) draw;
 980
 981    /*
 982     * Create / install AA line drawing / prim stage
 983     */
 984    aaline = draw_aaline_stage( draw );
 985    if (!aaline)
 986       goto fail;
 987
 988    /* create special texture, sampler state */
 989    if (!aaline_create_texture(aaline))
 990       goto fail;
 991
 992    if (!aaline_create_sampler(aaline))
 993       goto fail;
 994
 995    /* save original driver functions */
 996    aaline->driver_create_fs_state = pipe->create_fs_state;
 997    aaline->driver_bind_fs_state = pipe->bind_fs_state;
 998    aaline->driver_delete_fs_state = pipe->delete_fs_state;
 999
1000    aaline->driver_bind_fragment_sampler_states = pipe->bind_fragment_sampler_states;
1001    aaline->driver_set_sampler_views = pipe->set_fragment_sampler_views;
1002
1003    /* override the driver's functions */
1004    pipe->create_fs_state = aaline_create_fs_state;
1005    pipe->bind_fs_state = aaline_bind_fs_state;
1006    pipe->delete_fs_state = aaline_delete_fs_state;
1007
1008    pipe->bind_fragment_sampler_states = aaline_bind_fragment_sampler_states;
1009    pipe->set_fragment_sampler_views = aaline_set_sampler_views;
1010
1011    /* Install once everything is known to be OK:
1012     */
1013    draw->pipeline.aaline = &aaline->stage;
1014
1015    return TRUE;
1016
1017  fail:
1018    if (aaline)
1019       aaline->stage.destroy( &aaline->stage );
1020
1021    return FALSE;
1022 }