src/gallium/drivers/softpipe/sp_tile_cache.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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 VMWARE 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  * Render target tile caching.
  30  *
  31  * Author:
  32  *    Brian Paul
  33  */
  34
  35 #include "util/u_inlines.h"
  36 #include "util/format/u_format.h"
  37 #include "util/u_memory.h"
  38 #include "util/u_tile.h"
  39 #include "sp_tile_cache.h"
  40
  41 static struct softpipe_cached_tile *
  42 sp_alloc_tile(struct softpipe_tile_cache *tc);
  43
  44
  45 /**
  46  * Return the position in the cache for the tile that contains win pos (x,y).
  47  * We currently use a direct mapped cache so this is like a hack key.
  48  * At some point we should investige something more sophisticated, like
  49  * a LRU replacement policy.
  50  */
  51 #define CACHE_POS(x, y, l)                        \
  52    (((x) + (y) * 5 + (l) * 10) % NUM_ENTRIES)
  53
  54
  55 static inline int addr_to_clear_pos(union tile_address addr)
  56 {
  57    int pos;
  58    pos = addr.bits.layer * (MAX_WIDTH / TILE_SIZE) * (MAX_HEIGHT / TILE_SIZE);
  59    pos += addr.bits.y * (MAX_WIDTH / TILE_SIZE);
  60    pos += addr.bits.x;
  61    return pos;
  62 }
  63 /**
  64  * Is the tile at (x,y) in cleared state?
  65  */
  66 static inline uint
  67 is_clear_flag_set(const uint *bitvec, union tile_address addr, unsigned max)
  68 {
  69    int pos, bit;
  70    pos = addr_to_clear_pos(addr);
  71    assert(pos / 32 < max);
  72    bit = bitvec[pos / 32] & (1 << (pos & 31));
  73    return bit;
  74 }
  75
  76
  77 /**
  78  * Mark the tile at (x,y) as not cleared.
  79  */
  80 static inline void
  81 clear_clear_flag(uint *bitvec, union tile_address addr, unsigned max)
  82 {
  83    int pos;
  84    pos = addr_to_clear_pos(addr);
  85    assert(pos / 32 < max);
  86    bitvec[pos / 32] &= ~(1 << (pos & 31));
  87 }
  88
  89
  90 struct softpipe_tile_cache *
  91 sp_create_tile_cache( struct pipe_context *pipe )
  92 {
  93    struct softpipe_tile_cache *tc;
  94    uint pos;
  95
  96    /* sanity checking: max sure MAX_WIDTH/HEIGHT >= largest texture image */
  97    assert(MAX_WIDTH >= pipe->screen->get_param(pipe->screen,
  98                                                PIPE_CAP_MAX_TEXTURE_2D_SIZE));
  99
 100    STATIC_ASSERT(sizeof(union tile_address) == 4);
 101
 102    STATIC_ASSERT((TILE_SIZE << TILE_ADDR_BITS) >= MAX_WIDTH);
 103
 104    tc = CALLOC_STRUCT( softpipe_tile_cache );
 105    if (tc) {
 106       tc->pipe = pipe;
 107       for (pos = 0; pos < ARRAY_SIZE(tc->tile_addrs); pos++) {
 108          tc->tile_addrs[pos].bits.invalid = 1;
 109       }
 110       tc->last_tile_addr.bits.invalid = 1;
 111
 112       /* this allocation allows us to guarantee that allocation
 113        * failures are never fatal later
 114        */
 115       tc->tile = MALLOC_STRUCT( softpipe_cached_tile );
 116       if (!tc->tile)
 117       {
 118          FREE(tc);
 119          return NULL;
 120       }
 121
 122       /* XXX this code prevents valgrind warnings about use of uninitialized
 123        * memory in programs that don't clear the surface before rendering.
 124        * However, it breaks clearing in other situations (such as in
 125        * progs/tests/drawbuffers, see bug 24402).
 126        */
 127 #if 0
 128       /* set flags to indicate all the tiles are cleared */
 129       memset(tc->clear_flags, 255, sizeof(tc->clear_flags));
 130 #endif
 131    }
 132    return tc;
 133 }
 134
 135
 136 void
 137 sp_destroy_tile_cache(struct softpipe_tile_cache *tc)
 138 {
 139    if (tc) {
 140       uint pos;
 141
 142       for (pos = 0; pos < ARRAY_SIZE(tc->entries); pos++) {
 143          /*assert(tc->entries[pos].x < 0);*/
 144          FREE( tc->entries[pos] );
 145       }
 146       FREE( tc->tile );
 147
 148       if (tc->num_maps) {
 149          int i;
 150          for (i = 0; i < tc->num_maps; i++)
 151             if (tc->transfer[i]) {
 152                tc->pipe->transfer_unmap(tc->pipe, tc->transfer[i]);
 153             }
 154          FREE(tc->transfer);
 155          FREE(tc->transfer_map);
 156          FREE(tc->clear_flags);
 157       }
 158
 159       FREE( tc );
 160    }
 161 }
 162
 163
 164 /**
 165  * Specify the surface to cache.
 166  */
 167 void
 168 sp_tile_cache_set_surface(struct softpipe_tile_cache *tc,
 169                           struct pipe_surface *ps)
 170 {
 171    struct pipe_context *pipe = tc->pipe;
 172    int i;
 173
 174    if (tc->num_maps) {
 175       if (ps == tc->surface)
 176          return;
 177
 178       for (i = 0; i < tc->num_maps; i++) {
 179          pipe->transfer_unmap(pipe, tc->transfer[i]);
 180          tc->transfer[i] = NULL;
 181          tc->transfer_map[i] = NULL;
 182       }
 183       FREE(tc->transfer);
 184       FREE(tc->transfer_map);
 185       tc->num_maps = 0;
 186
 187       FREE(tc->clear_flags);
 188       tc->clear_flags_size = 0;
 189    }
 190
 191    tc->surface = ps;
 192
 193    if (ps) {
 194       tc->num_maps = ps->u.tex.last_layer - ps->u.tex.first_layer + 1;
 195       tc->transfer = CALLOC(tc->num_maps, sizeof(struct pipe_transfer *));
 196       tc->transfer_map = CALLOC(tc->num_maps, sizeof(void *));
 197
 198       tc->clear_flags_size = (MAX_WIDTH / TILE_SIZE) * (MAX_HEIGHT / TILE_SIZE) * tc->num_maps / 32 * sizeof(uint);
 199       tc->clear_flags = CALLOC(1, tc->clear_flags_size);
 200
 201       if (ps->texture->target != PIPE_BUFFER) {
 202          for (i = 0; i < tc->num_maps; i++) {
 203             tc->transfer_map[i] = pipe_transfer_map(pipe, ps->texture,
 204                                                     ps->u.tex.level, ps->u.tex.first_layer + i,
 205                                                     PIPE_TRANSFER_READ_WRITE |
 206                                                     PIPE_TRANSFER_UNSYNCHRONIZED,
 207                                                     0, 0, ps->width, ps->height,
 208                                                     &tc->transfer[i]);
 209          }
 210       }
 211       else {
 212          /* can't render to buffers */
 213          assert(0);
 214       }
 215
 216       tc->depth_stencil = util_format_is_depth_or_stencil(ps->format);
 217    }
 218 }
 219
 220
 221 /**
 222  * Return the transfer being cached.
 223  */
 224 struct pipe_surface *
 225 sp_tile_cache_get_surface(struct softpipe_tile_cache *tc)
 226 {
 227    return tc->surface;
 228 }
 229
 230
 231 /**
 232  * Set pixels in a tile to the given clear color/value, float.
 233  */
 234 static void
 235 clear_tile_rgba(struct softpipe_cached_tile *tile,
 236                 enum pipe_format format,
 237                 const union pipe_color_union *clear_value)
 238 {
 239    if (clear_value->f[0] == 0.0 &&
 240        clear_value->f[1] == 0.0 &&
 241        clear_value->f[2] == 0.0 &&
 242        clear_value->f[3] == 0.0) {
 243       memset(tile->data.color, 0, sizeof(tile->data.color));
 244    }
 245    else {
 246       uint i, j;
 247
 248       if (util_format_is_pure_uint(format)) {
 249          for (i = 0; i < TILE_SIZE; i++) {
 250             for (j = 0; j < TILE_SIZE; j++) {
 251                tile->data.colorui128[i][j][0] = clear_value->ui[0];
 252                tile->data.colorui128[i][j][1] = clear_value->ui[1];
 253                tile->data.colorui128[i][j][2] = clear_value->ui[2];
 254                tile->data.colorui128[i][j][3] = clear_value->ui[3];
 255             }
 256          }
 257       } else if (util_format_is_pure_sint(format)) {
 258          for (i = 0; i < TILE_SIZE; i++) {
 259             for (j = 0; j < TILE_SIZE; j++) {
 260                tile->data.colori128[i][j][0] = clear_value->i[0];
 261                tile->data.colori128[i][j][1] = clear_value->i[1];
 262                tile->data.colori128[i][j][2] = clear_value->i[2];
 263                tile->data.colori128[i][j][3] = clear_value->i[3];
 264             }
 265          }
 266       } else {
 267          for (i = 0; i < TILE_SIZE; i++) {
 268             for (j = 0; j < TILE_SIZE; j++) {
 269                tile->data.color[i][j][0] = clear_value->f[0];
 270                tile->data.color[i][j][1] = clear_value->f[1];
 271                tile->data.color[i][j][2] = clear_value->f[2];
 272                tile->data.color[i][j][3] = clear_value->f[3];
 273             }
 274          }
 275       }
 276    }
 277 }
 278
 279
 280 /**
 281  * Set a tile to a solid value/color.
 282  */
 283 static void
 284 clear_tile(struct softpipe_cached_tile *tile,
 285            enum pipe_format format,
 286            uint64_t clear_value)
 287 {
 288    uint i, j;
 289
 290    switch (util_format_get_blocksize(format)) {
 291    case 1:
 292       memset(tile->data.any, (int) clear_value, TILE_SIZE * TILE_SIZE);
 293       break;
 294    case 2:
 295       if (clear_value == 0) {
 296          memset(tile->data.any, 0, 2 * TILE_SIZE * TILE_SIZE);
 297       }
 298       else {
 299          for (i = 0; i < TILE_SIZE; i++) {
 300             for (j = 0; j < TILE_SIZE; j++) {
 301                tile->data.depth16[i][j] = (ushort) clear_value;
 302             }
 303          }
 304       }
 305       break;
 306    case 4:
 307       if (clear_value == 0) {
 308          memset(tile->data.any, 0, 4 * TILE_SIZE * TILE_SIZE);
 309       }
 310       else {
 311          for (i = 0; i < TILE_SIZE; i++) {
 312             for (j = 0; j < TILE_SIZE; j++) {
 313                tile->data.depth32[i][j] = (uint) clear_value;
 314             }
 315          }
 316       }
 317       break;
 318    case 8:
 319       if (clear_value == 0) {
 320          memset(tile->data.any, 0, 8 * TILE_SIZE * TILE_SIZE);
 321       }
 322       else {
 323          for (i = 0; i < TILE_SIZE; i++) {
 324             for (j = 0; j < TILE_SIZE; j++) {
 325                tile->data.depth64[i][j] = clear_value;
 326             }
 327          }
 328       }
 329       break;
 330    default:
 331       assert(0);
 332    }
 333 }
 334
 335
 336 /**
 337  * Actually clear the tiles which were flagged as being in a clear state.
 338  */
 339 static void
 340 sp_tile_cache_flush_clear(struct softpipe_tile_cache *tc, int layer)
 341 {
 342    struct pipe_transfer *pt = tc->transfer[layer];
 343    const uint w = tc->transfer[layer]->box.width;
 344    const uint h = tc->transfer[layer]->box.height;
 345    uint x, y;
 346    uint numCleared = 0;
 347
 348    assert(pt->resource);
 349
 350    /* clear the scratch tile to the clear value */
 351    if (tc->depth_stencil) {
 352       clear_tile(tc->tile, pt->resource->format, tc->clear_val);
 353    } else {
 354       clear_tile_rgba(tc->tile, pt->resource->format, &tc->clear_color);
 355    }
 356
 357    /* push the tile to all positions marked as clear */
 358    for (y = 0; y < h; y += TILE_SIZE) {
 359       for (x = 0; x < w; x += TILE_SIZE) {
 360          union tile_address addr = tile_address(x, y, layer);
 361
 362          if (is_clear_flag_set(tc->clear_flags, addr, tc->clear_flags_size)) {
 363             /* write the scratch tile to the surface */
 364             if (tc->depth_stencil) {
 365                pipe_put_tile_raw(pt, tc->transfer_map[layer],
 366                                  x, y, TILE_SIZE, TILE_SIZE,
 367                                  tc->tile->data.any, 0/*STRIDE*/);
 368             }
 369             else {
 370                if (util_format_is_pure_uint(tc->surface->format)) {
 371                   pipe_put_tile_ui_format(pt, tc->transfer_map[layer],
 372                                           x, y, TILE_SIZE, TILE_SIZE,
 373                                           tc->surface->format,
 374                                           (unsigned *) tc->tile->data.colorui128);
 375                } else if (util_format_is_pure_sint(tc->surface->format)) {
 376                   pipe_put_tile_i_format(pt, tc->transfer_map[layer],
 377                                          x, y, TILE_SIZE, TILE_SIZE,
 378                                          tc->surface->format,
 379                                          (int *) tc->tile->data.colori128);
 380                } else {
 381                   pipe_put_tile_rgba_format(pt, tc->transfer_map[layer],
 382                                             x, y, TILE_SIZE, TILE_SIZE,
 383                                             tc->surface->format,
 384                                             (float *) tc->tile->data.color);
 385                }
 386             }
 387             numCleared++;
 388          }
 389       }
 390    }
 391
 392
 393 #if 0
 394    debug_printf("num cleared: %u\n", numCleared);
 395 #endif
 396 }
 397
 398 static void
 399 sp_flush_tile(struct softpipe_tile_cache* tc, unsigned pos)
 400 {
 401    int layer = tc->tile_addrs[pos].bits.layer;
 402    if (!tc->tile_addrs[pos].bits.invalid) {
 403       if (tc->depth_stencil) {
 404          pipe_put_tile_raw(tc->transfer[layer], tc->transfer_map[layer],
 405                            tc->tile_addrs[pos].bits.x * TILE_SIZE,
 406                            tc->tile_addrs[pos].bits.y * TILE_SIZE,
 407                            TILE_SIZE, TILE_SIZE,
 408                            tc->entries[pos]->data.depth32, 0/*STRIDE*/);
 409       }
 410       else {
 411          if (util_format_is_pure_uint(tc->surface->format)) {
 412             pipe_put_tile_ui_format(tc->transfer[layer], tc->transfer_map[layer],
 413                                     tc->tile_addrs[pos].bits.x * TILE_SIZE,
 414                                     tc->tile_addrs[pos].bits.y * TILE_SIZE,
 415                                     TILE_SIZE, TILE_SIZE,
 416                                     tc->surface->format,
 417                                     (unsigned *) tc->entries[pos]->data.colorui128);
 418          } else if (util_format_is_pure_sint(tc->surface->format)) {
 419             pipe_put_tile_i_format(tc->transfer[layer], tc->transfer_map[layer],
 420                                    tc->tile_addrs[pos].bits.x * TILE_SIZE,
 421                                    tc->tile_addrs[pos].bits.y * TILE_SIZE,
 422                                    TILE_SIZE, TILE_SIZE,
 423                                    tc->surface->format,
 424                                    (int *) tc->entries[pos]->data.colori128);
 425          } else {
 426             pipe_put_tile_rgba_format(tc->transfer[layer], tc->transfer_map[layer],
 427                                       tc->tile_addrs[pos].bits.x * TILE_SIZE,
 428                                       tc->tile_addrs[pos].bits.y * TILE_SIZE,
 429                                       TILE_SIZE, TILE_SIZE,
 430                                       tc->surface->format,
 431                                       (float *) tc->entries[pos]->data.color);
 432          }
 433       }
 434       tc->tile_addrs[pos].bits.invalid = 1;  /* mark as empty */
 435    }
 436 }
 437
 438 /**
 439  * Flush the tile cache: write all dirty tiles back to the transfer.
 440  * any tiles "flagged" as cleared will be "really" cleared.
 441  */
 442 void
 443 sp_flush_tile_cache(struct softpipe_tile_cache *tc)
 444 {
 445    int inuse = 0, pos;
 446    int i;
 447    if (tc->num_maps) {
 448       /* caching a drawing transfer */
 449       for (pos = 0; pos < ARRAY_SIZE(tc->entries); pos++) {
 450          struct softpipe_cached_tile *tile = tc->entries[pos];
 451          if (!tile)
 452          {
 453             assert(tc->tile_addrs[pos].bits.invalid);
 454             continue;
 455          }
 456          sp_flush_tile(tc, pos);
 457          ++inuse;
 458       }
 459
 460       if (!tc->tile)
 461          tc->tile = sp_alloc_tile(tc);
 462
 463       for (i = 0; i < tc->num_maps; i++)
 464          sp_tile_cache_flush_clear(tc, i);
 465       /* reset all clear flags to zero */
 466       memset(tc->clear_flags, 0, tc->clear_flags_size);
 467
 468       tc->last_tile_addr.bits.invalid = 1;
 469    }
 470
 471 #if 0
 472    debug_printf("flushed tiles in use: %d\n", inuse);
 473 #endif
 474 }
 475
 476 static struct softpipe_cached_tile *
 477 sp_alloc_tile(struct softpipe_tile_cache *tc)
 478 {
 479    struct softpipe_cached_tile * tile = MALLOC_STRUCT(softpipe_cached_tile);
 480    if (!tile)
 481    {
 482       /* in this case, steal an existing tile */
 483       if (!tc->tile)
 484       {
 485          unsigned pos;
 486          for (pos = 0; pos < ARRAY_SIZE(tc->entries); ++pos) {
 487             if (!tc->entries[pos])
 488                continue;
 489
 490             sp_flush_tile(tc, pos);
 491             tc->tile = tc->entries[pos];
 492             tc->entries[pos] = NULL;
 493             break;
 494          }
 495
 496          /* this should never happen */
 497          if (!tc->tile)
 498             abort();
 499       }
 500
 501       tile = tc->tile;
 502       tc->tile = NULL;
 503
 504       tc->last_tile_addr.bits.invalid = 1;
 505    }
 506    return tile;
 507 }
 508
 509 /**
 510  * Get a tile from the cache.
 511  * \param x, y  position of tile, in pixels
 512  */
 513 struct softpipe_cached_tile *
 514 sp_find_cached_tile(struct softpipe_tile_cache *tc,
 515                     union tile_address addr )
 516 {
 517    struct pipe_transfer *pt;
 518    /* cache pos/entry: */
 519    const int pos = CACHE_POS(addr.bits.x,
 520                              addr.bits.y, addr.bits.layer);
 521    struct softpipe_cached_tile *tile = tc->entries[pos];
 522    int layer;
 523    if (!tile) {
 524       tile = sp_alloc_tile(tc);
 525       tc->entries[pos] = tile;
 526    }
 527
 528    if (addr.value != tc->tile_addrs[pos].value) {
 529
 530       layer = tc->tile_addrs[pos].bits.layer;
 531       if (tc->tile_addrs[pos].bits.invalid == 0) {
 532          /* put dirty tile back in framebuffer */
 533          if (tc->depth_stencil) {
 534             pipe_put_tile_raw(tc->transfer[layer], tc->transfer_map[layer],
 535                               tc->tile_addrs[pos].bits.x * TILE_SIZE,
 536                               tc->tile_addrs[pos].bits.y * TILE_SIZE,
 537                               TILE_SIZE, TILE_SIZE,
 538                               tile->data.depth32, 0/*STRIDE*/);
 539          }
 540          else {
 541             if (util_format_is_pure_uint(tc->surface->format)) {
 542                pipe_put_tile_ui_format(tc->transfer[layer], tc->transfer_map[layer],
 543                                       tc->tile_addrs[pos].bits.x * TILE_SIZE,
 544                                       tc->tile_addrs[pos].bits.y * TILE_SIZE,
 545                                       TILE_SIZE, TILE_SIZE,
 546                                       tc->surface->format,
 547                                       (unsigned *) tile->data.colorui128);
 548             } else if (util_format_is_pure_sint(tc->surface->format)) {
 549                pipe_put_tile_i_format(tc->transfer[layer], tc->transfer_map[layer],
 550                                       tc->tile_addrs[pos].bits.x * TILE_SIZE,
 551                                       tc->tile_addrs[pos].bits.y * TILE_SIZE,
 552                                       TILE_SIZE, TILE_SIZE,
 553                                       tc->surface->format,
 554                                       (int *) tile->data.colori128);
 555             } else {
 556                pipe_put_tile_rgba_format(tc->transfer[layer], tc->transfer_map[layer],
 557                                          tc->tile_addrs[pos].bits.x * TILE_SIZE,
 558                                          tc->tile_addrs[pos].bits.y * TILE_SIZE,
 559                                          TILE_SIZE, TILE_SIZE,
 560                                          tc->surface->format,
 561                                          (float *) tile->data.color);
 562             }
 563          }
 564       }
 565
 566       tc->tile_addrs[pos] = addr;
 567
 568       layer = tc->tile_addrs[pos].bits.layer;
 569       pt = tc->transfer[layer];
 570       assert(pt->resource);
 571
 572       if (is_clear_flag_set(tc->clear_flags, addr, tc->clear_flags_size)) {
 573          /* don't get tile from framebuffer, just clear it */
 574          if (tc->depth_stencil) {
 575             clear_tile(tile, pt->resource->format, tc->clear_val);
 576          }
 577          else {
 578             clear_tile_rgba(tile, pt->resource->format, &tc->clear_color);
 579          }
 580          clear_clear_flag(tc->clear_flags, addr, tc->clear_flags_size);
 581       }
 582       else {
 583          /* get new tile data from transfer */
 584          if (tc->depth_stencil) {
 585             pipe_get_tile_raw(tc->transfer[layer], tc->transfer_map[layer],
 586                               tc->tile_addrs[pos].bits.x * TILE_SIZE,
 587                               tc->tile_addrs[pos].bits.y * TILE_SIZE,
 588                               TILE_SIZE, TILE_SIZE,
 589                               tile->data.depth32, 0/*STRIDE*/);
 590          }
 591          else {
 592             if (util_format_is_pure_uint(tc->surface->format)) {
 593                pipe_get_tile_ui_format(tc->transfer[layer], tc->transfer_map[layer],
 594                                          tc->tile_addrs[pos].bits.x * TILE_SIZE,
 595                                          tc->tile_addrs[pos].bits.y * TILE_SIZE,
 596                                          TILE_SIZE, TILE_SIZE,
 597                                          tc->surface->format,
 598                                          (unsigned *) tile->data.colorui128);
 599             } else if (util_format_is_pure_sint(tc->surface->format)) {
 600                pipe_get_tile_i_format(tc->transfer[layer], tc->transfer_map[layer],
 601                                          tc->tile_addrs[pos].bits.x * TILE_SIZE,
 602                                          tc->tile_addrs[pos].bits.y * TILE_SIZE,
 603                                          TILE_SIZE, TILE_SIZE,
 604                                          tc->surface->format,
 605                                          (int *) tile->data.colori128);
 606             } else {
 607                pipe_get_tile_rgba_format(tc->transfer[layer], tc->transfer_map[layer],
 608                                          tc->tile_addrs[pos].bits.x * TILE_SIZE,
 609                                          tc->tile_addrs[pos].bits.y * TILE_SIZE,
 610                                          TILE_SIZE, TILE_SIZE,
 611                                          tc->surface->format,
 612                                          (float *) tile->data.color);
 613             }
 614          }
 615       }
 616    }
 617
 618    tc->last_tile = tile;
 619    tc->last_tile_addr = addr;
 620    return tile;
 621 }
 622
 623
 624
 625
 626
 627 /**
 628  * When a whole surface is being cleared to a value we can avoid
 629  * fetching tiles above.
 630  * Save the color and set a 'clearflag' for each tile of the screen.
 631  */
 632 void
 633 sp_tile_cache_clear(struct softpipe_tile_cache *tc,
 634                     const union pipe_color_union *color,
 635                     uint64_t clearValue)
 636 {
 637    uint pos;
 638
 639    tc->clear_color = *color;
 640
 641    tc->clear_val = clearValue;
 642
 643    /* set flags to indicate all the tiles are cleared */
 644    memset(tc->clear_flags, 255, tc->clear_flags_size);
 645
 646    for (pos = 0; pos < ARRAY_SIZE(tc->tile_addrs); pos++) {
 647       tc->tile_addrs[pos].bits.invalid = 1;
 648    }
 649    tc->last_tile_addr.bits.invalid = 1;
 650 }