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_SAMPLERS];
 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_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 = TGSI_INTERPOLATE_PERSPECTIVE;
 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       ctx->emit_declaration(ctx, &decl);
 247
 248       /* declare new sampler */
 249       decl = tgsi_default_full_declaration();
 250       decl.Declaration.File = TGSI_FILE_SAMPLER;
 251       decl.Range.First =
 252       decl.Range.Last = aactx->freeSampler;
 253       ctx->emit_declaration(ctx, &decl);
 254
 255       /* declare new temp regs */
 256       decl = tgsi_default_full_declaration();
 257       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 258       decl.Range.First =
 259       decl.Range.Last = aactx->texTemp;
 260       ctx->emit_declaration(ctx, &decl);
 261
 262       decl = tgsi_default_full_declaration();
 263       decl.Declaration.File = TGSI_FILE_TEMPORARY;
 264       decl.Range.First =
 265       decl.Range.Last = aactx->colorTemp;
 266       ctx->emit_declaration(ctx, &decl);
 267
 268       aactx->firstInstruction = FALSE;
 269    }
 270
 271    if (inst->Instruction.Opcode == TGSI_OPCODE_END &&
 272        aactx->colorOutput != -1) {
 273       struct tgsi_full_instruction newInst;
 274
 275       /* TEX */
 276       newInst = tgsi_default_full_instruction();
 277       newInst.Instruction.Opcode = TGSI_OPCODE_TEX;
 278       newInst.Instruction.NumDstRegs = 1;
 279       newInst.Dst[0].Register.File = TGSI_FILE_TEMPORARY;
 280       newInst.Dst[0].Register.Index = aactx->texTemp;
 281       newInst.Instruction.NumSrcRegs = 2;
 282       newInst.Instruction.Texture = TRUE;
 283       newInst.Texture.Texture = TGSI_TEXTURE_2D;
 284       newInst.Src[0].Register.File = TGSI_FILE_INPUT;
 285       newInst.Src[0].Register.Index = aactx->maxInput + 1;
 286       newInst.Src[1].Register.File = TGSI_FILE_SAMPLER;
 287       newInst.Src[1].Register.Index = aactx->freeSampler;
 288
 289       ctx->emit_instruction(ctx, &newInst);
 290
 291       /* MOV rgb */
 292       newInst = tgsi_default_full_instruction();
 293       newInst.Instruction.Opcode = TGSI_OPCODE_MOV;
 294       newInst.Instruction.NumDstRegs = 1;
 295       newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
 296       newInst.Dst[0].Register.Index = aactx->colorOutput;
 297       newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_XYZ;
 298       newInst.Instruction.NumSrcRegs = 1;
 299       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 300       newInst.Src[0].Register.Index = aactx->colorTemp;
 301       ctx->emit_instruction(ctx, &newInst);
 302
 303       /* MUL alpha */
 304       newInst = tgsi_default_full_instruction();
 305       newInst.Instruction.Opcode = TGSI_OPCODE_MUL;
 306       newInst.Instruction.NumDstRegs = 1;
 307       newInst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
 308       newInst.Dst[0].Register.Index = aactx->colorOutput;
 309       newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_W;
 310       newInst.Instruction.NumSrcRegs = 2;
 311       newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY;
 312       newInst.Src[0].Register.Index = aactx->colorTemp;
 313       newInst.Src[1].Register.File = TGSI_FILE_TEMPORARY;
 314       newInst.Src[1].Register.Index = aactx->texTemp;
 315       ctx->emit_instruction(ctx, &newInst);
 316
 317       /* END */
 318       newInst = tgsi_default_full_instruction();
 319       newInst.Instruction.Opcode = TGSI_OPCODE_END;
 320       newInst.Instruction.NumDstRegs = 0;
 321       newInst.Instruction.NumSrcRegs = 0;
 322       ctx->emit_instruction(ctx, &newInst);
 323    }
 324    else {
 325       /* Not an END instruction.
 326        * Look for writes to result.color and replace with colorTemp reg.
 327        */
 328       uint i;
 329
 330       for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
 331          struct tgsi_full_dst_register *dst = &inst->Dst[i];
 332          if (dst->Register.File == TGSI_FILE_OUTPUT &&
 333              dst->Register.Index == aactx->colorOutput) {
 334             dst->Register.File = TGSI_FILE_TEMPORARY;
 335             dst->Register.Index = aactx->colorTemp;
 336          }
 337       }
 338
 339       ctx->emit_instruction(ctx, inst);
 340    }
 341 }
 342
 343
 344 /**
 345  * Generate the frag shader we'll use for drawing AA lines.
 346  * This will be the user's shader plus some texture/modulate instructions.
 347  */
 348 static boolean
 349 generate_aaline_fs(struct aaline_stage *aaline)
 350 {
 351    struct pipe_context *pipe = aaline->stage.draw->pipe;
 352    const struct pipe_shader_state *orig_fs = &aaline->fs->state;
 353    struct pipe_shader_state aaline_fs;
 354    struct aa_transform_context transform;
 355    const uint newLen = tgsi_num_tokens(orig_fs->tokens) + NUM_NEW_TOKENS;
 356
 357    aaline_fs = *orig_fs; /* copy to init */
 358    aaline_fs.tokens = tgsi_alloc_tokens(newLen);
 359    if (aaline_fs.tokens == NULL)
 360       return FALSE;
 361
 362    memset(&transform, 0, sizeof(transform));
 363    transform.colorOutput = -1;
 364    transform.maxInput = -1;
 365    transform.maxGeneric = -1;
 366    transform.colorTemp = -1;
 367    transform.texTemp = -1;
 368    transform.firstInstruction = TRUE;
 369    transform.base.transform_instruction = aa_transform_inst;
 370    transform.base.transform_declaration = aa_transform_decl;
 371
 372    tgsi_transform_shader(orig_fs->tokens,
 373                          (struct tgsi_token *) aaline_fs.tokens,
 374                          newLen, &transform.base);
 375
 376 #if 0 /* DEBUG */
 377    tgsi_dump(orig_fs->tokens, 0);
 378    tgsi_dump(aaline_fs.tokens, 0);
 379 #endif
 380
 381    aaline->fs->sampler_unit = transform.freeSampler;
 382
 383    aaline->fs->aaline_fs = aaline->driver_create_fs_state(pipe, &aaline_fs);
 384    if (aaline->fs->aaline_fs == NULL)
 385       goto fail;
 386
 387    aaline->fs->generic_attrib = transform.maxGeneric + 1;
 388    FREE((void *)aaline_fs.tokens);
 389    return TRUE;
 390
 391 fail:
 392    FREE((void *)aaline_fs.tokens);
 393    return FALSE;
 394 }
 395
 396
 397 /**
 398  * Create the texture map we'll use for antialiasing the lines.
 399  */
 400 static boolean
 401 aaline_create_texture(struct aaline_stage *aaline)
 402 {
 403    struct pipe_context *pipe = aaline->stage.draw->pipe;
 404    struct pipe_screen *screen = pipe->screen;
 405    struct pipe_resource texTemp;
 406    struct pipe_sampler_view viewTempl;
 407    uint level;
 408
 409    memset(&texTemp, 0, sizeof(texTemp));
 410    texTemp.target = PIPE_TEXTURE_2D;
 411    texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
 412    texTemp.last_level = MAX_TEXTURE_LEVEL;
 413    texTemp.width0 = 1 << TEXTURE_SIZE_LOG2;
 414    texTemp.height0 = 1 << TEXTURE_SIZE_LOG2;
 415    texTemp.depth0 = 1;
 416    texTemp.array_size = 1;
 417    texTemp.bind = PIPE_BIND_SAMPLER_VIEW;
 418
 419    aaline->texture = screen->resource_create(screen, &texTemp);
 420    if (!aaline->texture)
 421       return FALSE;
 422
 423    u_sampler_view_default_template(&viewTempl,
 424                                    aaline->texture,
 425                                    aaline->texture->format);
 426    aaline->sampler_view = pipe->create_sampler_view(pipe,
 427                                                     aaline->texture,
 428                                                     &viewTempl);
 429    if (!aaline->sampler_view) {
 430       return FALSE;
 431    }
 432
 433    /* Fill in mipmap images.
 434     * Basically each level is solid opaque, except for the outermost
 435     * texels which are zero.  Special case the 1x1 and 2x2 levels
 436     * (though, those levels shouldn't be used - see the max_lod setting).
 437     */
 438    for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
 439       struct pipe_transfer *transfer;
 440       struct pipe_box box;
 441       const uint size = u_minify(aaline->texture->width0, level);
 442       ubyte *data;
 443       uint i, j;
 444
 445       assert(aaline->texture->width0 == aaline->texture->height0);
 446
 447       u_box_origin_2d( size, size, &box );
 448
 449       /* This texture is new, no need to flush.
 450        */
 451       transfer = pipe->get_transfer(pipe,
 452                                     aaline->texture,
 453                                     level,
 454                                     PIPE_TRANSFER_WRITE,
 455                                     &box);
 456
 457       data = pipe->transfer_map(pipe, transfer);
 458       if (data == NULL)
 459          return FALSE;
 460
 461       for (i = 0; i < size; i++) {
 462          for (j = 0; j < size; j++) {
 463             ubyte d;
 464             if (size == 1) {
 465                d = 255;
 466             }
 467             else if (size == 2) {
 468                d = 200; /* tuneable */
 469             }
 470             else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
 471                d = 35;  /* edge texel */
 472             }
 473             else {
 474                d = 255;
 475             }
 476             data[i * transfer->stride + j] = d;
 477          }
 478       }
 479
 480       /* unmap */
 481       pipe->transfer_unmap(pipe, transfer);
 482       pipe->transfer_destroy(pipe, transfer);
 483    }
 484    return TRUE;
 485 }
 486
 487
 488 /**
 489  * Create the sampler CSO that'll be used for antialiasing.
 490  * By using a mipmapped texture, we don't have to generate a different
 491  * texture image for each line size.
 492  */
 493 static boolean
 494 aaline_create_sampler(struct aaline_stage *aaline)
 495 {
 496    struct pipe_sampler_state sampler;
 497    struct pipe_context *pipe = aaline->stage.draw->pipe;
 498
 499    memset(&sampler, 0, sizeof(sampler));
 500    sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 501    sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 502    sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 503    sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
 504    sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
 505    sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
 506    sampler.normalized_coords = 1;
 507    sampler.min_lod = 0.0f;
 508    sampler.max_lod = MAX_TEXTURE_LEVEL;
 509
 510    aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
 511    if (aaline->sampler_cso == NULL)
 512       return FALSE;
 513
 514    return TRUE;
 515 }
 516
 517
 518 /**
 519  * When we're about to draw our first AA line in a batch, this function is
 520  * called to tell the driver to bind our modified fragment shader.
 521  */
 522 static boolean
 523 bind_aaline_fragment_shader(struct aaline_stage *aaline)
 524 {
 525    struct draw_context *draw = aaline->stage.draw;
 526    struct pipe_context *pipe = draw->pipe;
 527
 528    if (!aaline->fs->aaline_fs &&
 529        !generate_aaline_fs(aaline))
 530       return FALSE;
 531
 532    draw->suspend_flushing = TRUE;
 533    aaline->driver_bind_fs_state(pipe, aaline->fs->aaline_fs);
 534    draw->suspend_flushing = FALSE;
 535
 536    return TRUE;
 537 }
 538
 539
 540
 541 static INLINE struct aaline_stage *
 542 aaline_stage( struct draw_stage *stage )
 543 {
 544    return (struct aaline_stage *) stage;
 545 }
 546
 547
 548 /**
 549  * Draw a wide line by drawing a quad, using geometry which will
 550  * fullfill GL's antialiased line requirements.
 551  */
 552 static void
 553 aaline_line(struct draw_stage *stage, struct prim_header *header)
 554 {
 555    const struct aaline_stage *aaline = aaline_stage(stage);
 556    const float half_width = aaline->half_line_width;
 557    struct prim_header tri;
 558    struct vertex_header *v[8];
 559    uint texPos = aaline->tex_slot;
 560    uint posPos = aaline->pos_slot;
 561    float *pos, *tex;
 562    float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
 563    float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
 564    double a = atan2(dy, dx);
 565    float c_a = (float) cos(a), s_a = (float) sin(a);
 566    uint i;
 567
 568    /* XXX the ends of lines aren't quite perfect yet, but probably passable */
 569    dx = 0.5F * half_width;
 570    dy = half_width;
 571
 572    /* allocate/dup new verts */
 573    for (i = 0; i < 8; i++) {
 574       v[i] = dup_vert(stage, header->v[i/4], i);
 575    }
 576
 577    /*
 578     * Quad strip for line from v0 to v1 (*=endpoints):
 579     *
 580     *  1   3                     5   7
 581     *  +---+---------------------+---+
 582     *  |                             |
 583     *  | *v0                     v1* |
 584     *  |                             |
 585     *  +---+---------------------+---+
 586     *  0   2                     4   6
 587     */
 588
 589    /* new verts */
 590    pos = v[0]->data[posPos];
 591    pos[0] += (-dx * c_a -  dy * s_a);
 592    pos[1] += (-dx * s_a +  dy * c_a);
 593
 594    pos = v[1]->data[posPos];
 595    pos[0] += (-dx * c_a - -dy * s_a);
 596    pos[1] += (-dx * s_a + -dy * c_a);
 597
 598    pos = v[2]->data[posPos];
 599    pos[0] += ( dx * c_a -  dy * s_a);
 600    pos[1] += ( dx * s_a +  dy * c_a);
 601
 602    pos = v[3]->data[posPos];
 603    pos[0] += ( dx * c_a - -dy * s_a);
 604    pos[1] += ( dx * s_a + -dy * c_a);
 605
 606    pos = v[4]->data[posPos];
 607    pos[0] += (-dx * c_a -  dy * s_a);
 608    pos[1] += (-dx * s_a +  dy * c_a);
 609
 610    pos = v[5]->data[posPos];
 611    pos[0] += (-dx * c_a - -dy * s_a);
 612    pos[1] += (-dx * s_a + -dy * c_a);
 613
 614    pos = v[6]->data[posPos];
 615    pos[0] += ( dx * c_a -  dy * s_a);
 616    pos[1] += ( dx * s_a +  dy * c_a);
 617
 618    pos = v[7]->data[posPos];
 619    pos[0] += ( dx * c_a - -dy * s_a);
 620    pos[1] += ( dx * s_a + -dy * c_a);
 621
 622    /* new texcoords */
 623    tex = v[0]->data[texPos];
 624    ASSIGN_4V(tex, 0, 0, 0, 1);
 625
 626    tex = v[1]->data[texPos];
 627    ASSIGN_4V(tex, 0, 1, 0, 1);
 628
 629    tex = v[2]->data[texPos];
 630    ASSIGN_4V(tex, .5, 0, 0, 1);
 631
 632    tex = v[3]->data[texPos];
 633    ASSIGN_4V(tex, .5, 1, 0, 1);
 634
 635    tex = v[4]->data[texPos];
 636    ASSIGN_4V(tex, .5, 0, 0, 1);
 637
 638    tex = v[5]->data[texPos];
 639    ASSIGN_4V(tex, .5, 1, 0, 1);
 640
 641    tex = v[6]->data[texPos];
 642    ASSIGN_4V(tex, 1, 0, 0, 1);
 643
 644    tex = v[7]->data[texPos];
 645    ASSIGN_4V(tex, 1, 1, 0, 1);
 646
 647    /* emit 6 tris for the quad strip */
 648    tri.v[0] = v[2];  tri.v[1] = v[1];  tri.v[2] = v[0];
 649    stage->next->tri( stage->next, &tri );
 650
 651    tri.v[0] = v[3];  tri.v[1] = v[1];  tri.v[2] = v[2];
 652    stage->next->tri( stage->next, &tri );
 653
 654    tri.v[0] = v[4];  tri.v[1] = v[3];  tri.v[2] = v[2];
 655    stage->next->tri( stage->next, &tri );
 656
 657    tri.v[0] = v[5];  tri.v[1] = v[3];  tri.v[2] = v[4];
 658    stage->next->tri( stage->next, &tri );
 659
 660    tri.v[0] = v[6];  tri.v[1] = v[5];  tri.v[2] = v[4];
 661    stage->next->tri( stage->next, &tri );
 662
 663    tri.v[0] = v[7];  tri.v[1] = v[5];  tri.v[2] = v[6];
 664    stage->next->tri( stage->next, &tri );
 665 }
 666
 667
 668 static void
 669 aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 670 {
 671    auto struct aaline_stage *aaline = aaline_stage(stage);
 672    struct draw_context *draw = stage->draw;
 673    struct pipe_context *pipe = draw->pipe;
 674    const struct pipe_rasterizer_state *rast = draw->rasterizer;
 675    uint num_samplers;
 676    void *r;
 677
 678    assert(draw->rasterizer->line_smooth);
 679
 680    if (draw->rasterizer->line_width <= 2.2)
 681       aaline->half_line_width = 1.1f;
 682    else
 683       aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
 684
 685    /*
 686     * Bind (generate) our fragprog, sampler and texture
 687     */
 688    if (!bind_aaline_fragment_shader(aaline)) {
 689       stage->line = draw_pipe_passthrough_line;
 690       stage->line(stage, header);
 691       return;
 692    }
 693
 694    /* update vertex attrib info */
 695    aaline->tex_slot = draw_current_shader_outputs(draw);
 696    aaline->pos_slot = draw_current_shader_position_output(draw);;
 697
 698    /* allocate the extra post-transformed vertex attribute */
 699    (void) draw_alloc_extra_vertex_attrib(draw, TGSI_SEMANTIC_GENERIC,
 700                                          aaline->fs->generic_attrib);
 701
 702    /* how many samplers? */
 703    /* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
 704    num_samplers = MAX2(aaline->num_sampler_views, aaline->num_samplers);
 705    num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
 706
 707    aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
 708    pipe_sampler_view_reference(&aaline->state.sampler_views[aaline->fs->sampler_unit],
 709                                aaline->sampler_view);
 710
 711    draw->suspend_flushing = TRUE;
 712    aaline->driver_bind_sampler_states(pipe, num_samplers, aaline->state.sampler);
 713    aaline->driver_set_sampler_views(pipe, num_samplers, aaline->state.sampler_views);
 714
 715    /* Disable triangle culling, stippling, unfilled mode etc. */
 716    r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
 717    pipe->bind_rasterizer_state(pipe, r);
 718
 719    draw->suspend_flushing = FALSE;
 720
 721    /* now really draw first line */
 722    stage->line = aaline_line;
 723    stage->line(stage, header);
 724 }
 725
 726
 727 static void
 728 aaline_flush(struct draw_stage *stage, unsigned flags)
 729 {
 730    struct draw_context *draw = stage->draw;
 731    struct aaline_stage *aaline = aaline_stage(stage);
 732    struct pipe_context *pipe = draw->pipe;
 733
 734    stage->line = aaline_first_line;
 735    stage->next->flush( stage->next, flags );
 736
 737    /* restore original frag shader, texture, sampler state */
 738    draw->suspend_flushing = TRUE;
 739    aaline->driver_bind_fs_state(pipe, aaline->fs->driver_fs);
 740    aaline->driver_bind_sampler_states(pipe, aaline->num_samplers,
 741                                       aaline->state.sampler);
 742    aaline->driver_set_sampler_views(pipe,
 743                                     aaline->num_sampler_views,
 744                                     aaline->state.sampler_views);
 745
 746    /* restore original rasterizer state */
 747    if (draw->rast_handle) {
 748       pipe->bind_rasterizer_state(pipe, draw->rast_handle);
 749    }
 750
 751    draw->suspend_flushing = FALSE;
 752
 753    draw_remove_extra_vertex_attribs(draw);
 754 }
 755
 756
 757 static void
 758 aaline_reset_stipple_counter(struct draw_stage *stage)
 759 {
 760    stage->next->reset_stipple_counter( stage->next );
 761 }
 762
 763
 764 static void
 765 aaline_destroy(struct draw_stage *stage)
 766 {
 767    struct aaline_stage *aaline = aaline_stage(stage);
 768    struct pipe_context *pipe = stage->draw->pipe;
 769    uint i;
 770
 771    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 772       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 773    }
 774
 775    if (aaline->sampler_cso)
 776       pipe->delete_sampler_state(pipe, aaline->sampler_cso);
 777
 778    if (aaline->texture)
 779       pipe_resource_reference(&aaline->texture, NULL);
 780
 781    if (aaline->sampler_view) {
 782       pipe_sampler_view_reference(&aaline->sampler_view, NULL);
 783    }
 784
 785    draw_free_temp_verts( stage );
 786
 787    /* restore the old entry points */
 788    pipe->create_fs_state = aaline->driver_create_fs_state;
 789    pipe->bind_fs_state = aaline->driver_bind_fs_state;
 790    pipe->delete_fs_state = aaline->driver_delete_fs_state;
 791
 792    pipe->bind_fragment_sampler_states = aaline->driver_bind_sampler_states;
 793    pipe->set_fragment_sampler_views = aaline->driver_set_sampler_views;
 794
 795    FREE( stage );
 796 }
 797
 798
 799 static struct aaline_stage *
 800 draw_aaline_stage(struct draw_context *draw)
 801 {
 802    struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
 803    if (aaline == NULL)
 804       return NULL;
 805
 806    aaline->stage.draw = draw;
 807    aaline->stage.name = "aaline";
 808    aaline->stage.next = NULL;
 809    aaline->stage.point = draw_pipe_passthrough_point;
 810    aaline->stage.line = aaline_first_line;
 811    aaline->stage.tri = draw_pipe_passthrough_tri;
 812    aaline->stage.flush = aaline_flush;
 813    aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
 814    aaline->stage.destroy = aaline_destroy;
 815
 816    if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
 817       goto fail;
 818
 819    return aaline;
 820
 821  fail:
 822    if (aaline)
 823       aaline->stage.destroy(&aaline->stage);
 824
 825    return NULL;
 826 }
 827
 828
 829 static struct aaline_stage *
 830 aaline_stage_from_pipe(struct pipe_context *pipe)
 831 {
 832    struct draw_context *draw = (struct draw_context *) pipe->draw;
 833    return aaline_stage(draw->pipeline.aaline);
 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 = CALLOC_STRUCT(aaline_fragment_shader);
 847
 848    if (aafs == NULL)
 849       return NULL;
 850
 851    aafs->state = *fs;
 852
 853    /* pass-through */
 854    aafs->driver_fs = aaline->driver_create_fs_state(pipe, fs);
 855
 856    return aafs;
 857 }
 858
 859
 860 static void
 861 aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
 862 {
 863    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 864    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 865
 866    /* save current */
 867    aaline->fs = aafs;
 868    /* pass-through */
 869    aaline->driver_bind_fs_state(pipe, (aafs ? aafs->driver_fs : NULL));
 870 }
 871
 872
 873 static void
 874 aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
 875 {
 876    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 877    struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
 878
 879    /* pass-through */
 880    aaline->driver_delete_fs_state(pipe, aafs->driver_fs);
 881
 882    if (aafs->aaline_fs)
 883       aaline->driver_delete_fs_state(pipe, aafs->aaline_fs);
 884
 885    FREE(aafs);
 886 }
 887
 888
 889 static void
 890 aaline_bind_sampler_states(struct pipe_context *pipe,
 891                            unsigned num, void **sampler)
 892 {
 893    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 894
 895    /* save current */
 896    memcpy(aaline->state.sampler, sampler, num * sizeof(void *));
 897    aaline->num_samplers = num;
 898
 899    /* pass-through */
 900    aaline->driver_bind_sampler_states(pipe, num, sampler);
 901 }
 902
 903
 904 static void
 905 aaline_set_sampler_views(struct pipe_context *pipe,
 906                          unsigned num,
 907                          struct pipe_sampler_view **views)
 908 {
 909    struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
 910    uint i;
 911
 912    /* save current */
 913    for (i = 0; i < num; i++) {
 914       pipe_sampler_view_reference(&aaline->state.sampler_views[i], views[i]);
 915    }
 916    for ( ; i < PIPE_MAX_SAMPLERS; i++) {
 917       pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
 918    }
 919    aaline->num_sampler_views = num;
 920
 921    /* pass-through */
 922    aaline->driver_set_sampler_views(pipe, num, views);
 923 }
 924
 925
 926 /**
 927  * Called by drivers that want to install this AA line prim stage
 928  * into the draw module's pipeline.  This will not be used if the
 929  * hardware has native support for AA lines.
 930  */
 931 boolean
 932 draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
 933 {
 934    struct aaline_stage *aaline;
 935
 936    pipe->draw = (void *) draw;
 937
 938    /*
 939     * Create / install AA line drawing / prim stage
 940     */
 941    aaline = draw_aaline_stage( draw );
 942    if (!aaline)
 943       goto fail;
 944
 945    /* create special texture, sampler state */
 946    if (!aaline_create_texture(aaline))
 947       goto fail;
 948
 949    if (!aaline_create_sampler(aaline))
 950       goto fail;
 951
 952    /* save original driver functions */
 953    aaline->driver_create_fs_state = pipe->create_fs_state;
 954    aaline->driver_bind_fs_state = pipe->bind_fs_state;
 955    aaline->driver_delete_fs_state = pipe->delete_fs_state;
 956
 957    aaline->driver_bind_sampler_states = pipe->bind_fragment_sampler_states;
 958    aaline->driver_set_sampler_views = pipe->set_fragment_sampler_views;
 959
 960    /* override the driver's functions */
 961    pipe->create_fs_state = aaline_create_fs_state;
 962    pipe->bind_fs_state = aaline_bind_fs_state;
 963    pipe->delete_fs_state = aaline_delete_fs_state;
 964
 965    pipe->bind_fragment_sampler_states = aaline_bind_sampler_states;
 966    pipe->set_fragment_sampler_views = aaline_set_sampler_views;
 967
 968    /* Install once everything is known to be OK:
 969     */
 970    draw->pipeline.aaline = &aaline->stage;
 971
 972    return TRUE;
 973
 974  fail:
 975    if (aaline)
 976       aaline->stage.destroy( &aaline->stage );
 977
 978    return FALSE;
 979 }