src/gallium/drivers/i915/i915_resource_texture.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 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   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   *   Michel Dänzer <michel@tungstengraphics.com>
  31   */
  32
  33 #include "pipe/p_state.h"
  34 #include "pipe/p_context.h"
  35 #include "pipe/p_defines.h"
  36 #include "util/u_inlines.h"
  37 #include "util/u_format.h"
  38 #include "util/u_math.h"
  39 #include "util/u_memory.h"
  40
  41 #include "i915_context.h"
  42 #include "i915_resource.h"
  43 #include "i915_screen.h"
  44 #include "i915_winsys.h"
  45
  46
  47 /*
  48  * Helper function and arrays
  49  */
  50
  51
  52 /**
  53  * Initial offset for Cube map.
  54  */
  55 static const int initial_offsets[6][2] = {
  56    {0, 0},
  57    {0, 2},
  58    {1, 0},
  59    {1, 2},
  60    {1, 1},
  61    {1, 3}
  62 };
  63
  64 /**
  65  * Step offsets for Cube map.
  66  */
  67 static const int step_offsets[6][2] = {
  68    {0, 2},
  69    {0, 2},
  70    {-1, 2},
  71    {-1, 2},
  72    {-1, 1},
  73    {-1, 1}
  74 };
  75
  76 /* XXX really need twice the size if x is already pot?
  77    Otherwise just use util_next_power_of_two?
  78 */
  79 static unsigned
  80 power_of_two(unsigned x)
  81 {
  82    unsigned value = 1;
  83    while (value < x)
  84       value = value << 1;
  85    return value;
  86 }
  87
  88 /*
  89  * More advanced helper funcs
  90  */
  91
  92
  93 static void
  94 i915_texture_set_level_info(struct i915_texture *tex,
  95                              unsigned level,
  96                              unsigned nr_images,
  97                              unsigned w, unsigned h, unsigned d)
  98 {
  99    assert(level < Elements(tex->nr_images));
 100
 101    tex->nr_images[level] = nr_images;
 102
 103    /*
 104    DBG("%s level %d size: %d,%d,%d offset %d,%d (0x%x)\n", __FUNCTION__,
 105        level, w, h, d, x, y, tex->level_offset[level]);
 106    */
 107
 108    /* Not sure when this would happen, but anyway:
 109     */
 110    if (tex->image_offset[level]) {
 111       FREE(tex->image_offset[level]);
 112       tex->image_offset[level] = NULL;
 113    }
 114
 115    assert(nr_images);
 116    assert(!tex->image_offset[level]);
 117
 118    tex->image_offset[level] = (unsigned *) MALLOC(nr_images * sizeof(unsigned));
 119    tex->image_offset[level][0] = 0;
 120 }
 121
 122 static void
 123 i915_texture_set_image_offset(struct i915_texture *tex,
 124                               unsigned level, unsigned img, unsigned x, unsigned y)
 125 {
 126    if (img == 0 && level == 0)
 127       assert(x == 0 && y == 0);
 128
 129    assert(img < tex->nr_images[level]);
 130
 131    tex->image_offset[level][img] = y * tex->stride + x * util_format_get_blocksize(tex->b.b.format);
 132
 133    /*
 134    printf("%s level %d img %d pos %d,%d image_offset %x\n",
 135        __FUNCTION__, level, img, x, y, tex->image_offset[level][img]);
 136    */
 137 }
 138
 139
 140 /*
 141  * i915 layout functions, some used by i945
 142  */
 143
 144
 145 /**
 146  * Special case to deal with scanout textures.
 147  */
 148 static boolean
 149 i915_scanout_layout(struct i915_texture *tex)
 150 {
 151    struct pipe_resource *pt = &tex->b.b;
 152
 153    if (pt->last_level > 0 || util_format_get_blocksize(pt->format) != 4)
 154       return FALSE;
 155
 156    i915_texture_set_level_info(tex, 0, 1,
 157                                pt->width0,
 158                                pt->height0,
 159                                1);
 160    i915_texture_set_image_offset(tex, 0, 0, 0, 0);
 161
 162    if (pt->width0 >= 240) {
 163       tex->stride = power_of_two(util_format_get_stride(pt->format, pt->width0));
 164       tex->total_nblocksy = align(util_format_get_nblocksy(pt->format, pt->height0), 8);
 165       tex->hw_tiled = I915_TILE_X;
 166    } else if (pt->width0 == 64 && pt->height0 == 64) {
 167       tex->stride = power_of_two(util_format_get_stride(pt->format, pt->width0));
 168       tex->total_nblocksy = align(util_format_get_nblocksy(pt->format, pt->height0), 8);
 169    } else {
 170       return FALSE;
 171    }
 172
 173    debug_printf("%s size: %d,%d,%d offset %d,%d (0x%x)\n", __FUNCTION__,
 174       pt->width0, pt->height0, util_format_get_blocksize(pt->format),
 175       tex->stride, tex->total_nblocksy, tex->stride * tex->total_nblocksy);
 176
 177    return TRUE;
 178 }
 179
 180 /**
 181  * Special case to deal with shared textures.
 182  */
 183 static boolean
 184 i915_display_target_layout(struct i915_texture *tex)
 185 {
 186    struct pipe_resource *pt = &tex->b.b;
 187
 188    if (pt->last_level > 0 || util_format_get_blocksize(pt->format) != 4)
 189       return FALSE;
 190
 191    /* fallback to normal textures for small textures */
 192    if (pt->width0 < 240)
 193       return FALSE;
 194
 195    i915_texture_set_level_info(tex, 0, 1,
 196                                pt->width0,
 197                                pt->height0,
 198                                1);
 199    i915_texture_set_image_offset(tex, 0, 0, 0, 0);
 200
 201    tex->stride = power_of_two(util_format_get_stride(pt->format, pt->width0));
 202    tex->total_nblocksy = align(util_format_get_nblocksy(pt->format, pt->height0), 8);
 203    tex->hw_tiled = I915_TILE_X;
 204
 205    debug_printf("%s size: %d,%d,%d offset %d,%d (0x%x)\n", __FUNCTION__,
 206       pt->width0, pt->height0, util_format_get_blocksize(pt->format),
 207       tex->stride, tex->total_nblocksy, tex->stride * tex->total_nblocksy);
 208
 209    return TRUE;
 210 }
 211
 212 static void
 213 i915_texture_layout_2d(struct i915_texture *tex)
 214 {
 215    struct pipe_resource *pt = &tex->b.b;
 216    unsigned level;
 217    unsigned width = pt->width0;
 218    unsigned height = pt->height0;
 219    unsigned nblocksy = util_format_get_nblocksy(pt->format, pt->width0);
 220
 221    /* used for scanouts that need special layouts */
 222    if (pt->bind & PIPE_BIND_SCANOUT)
 223       if (i915_scanout_layout(tex))
 224          return;
 225
 226    /* shared buffers needs to be compatible with X servers
 227     *
 228     * XXX: need a better name than shared for this if it is to be part
 229     * of core gallium, and probably move the flag to resource.flags,
 230     * rather than bindings.
 231     */
 232    if (pt->bind & PIPE_BIND_SHARED)
 233       if (i915_display_target_layout(tex))
 234          return;
 235
 236    tex->stride = align(util_format_get_stride(pt->format, pt->width0), 4);
 237    tex->total_nblocksy = 0;
 238
 239    for (level = 0; level <= pt->last_level; level++) {
 240       i915_texture_set_level_info(tex, level, 1, width, height, 1);
 241       i915_texture_set_image_offset(tex, level, 0, 0, tex->total_nblocksy);
 242
 243       nblocksy = align(MAX2(2, nblocksy), 2);
 244
 245       tex->total_nblocksy += nblocksy;
 246
 247       width = u_minify(width, 1);
 248       height = u_minify(height, 1);
 249       nblocksy = util_format_get_nblocksy(pt->format, height);
 250    }
 251 }
 252
 253 static void
 254 i915_texture_layout_3d(struct i915_texture *tex)
 255 {
 256    struct pipe_resource *pt = &tex->b.b;
 257    unsigned level;
 258
 259    unsigned width = pt->width0;
 260    unsigned height = pt->height0;
 261    unsigned depth = pt->depth0;
 262    unsigned nblocksy = util_format_get_nblocksy(pt->format, pt->height0);
 263    unsigned stack_nblocksy = 0;
 264
 265    /* Calculate the size of a single slice.
 266     */
 267    tex->stride = align(util_format_get_stride(pt->format, pt->width0), 4);
 268
 269    /* XXX: hardware expects/requires 9 levels at minimum.
 270     */
 271    for (level = 0; level <= MAX2(8, pt->last_level); level++) {
 272       i915_texture_set_level_info(tex, level, depth, width, height, depth);
 273
 274       stack_nblocksy += MAX2(2, nblocksy);
 275
 276       width = u_minify(width, 1);
 277       height = u_minify(height, 1);
 278       nblocksy = util_format_get_nblocksy(pt->format, height);
 279    }
 280
 281    /* Fixup depth image_offsets:
 282     */
 283    for (level = 0; level <= pt->last_level; level++) {
 284       unsigned i;
 285       for (i = 0; i < depth; i++)
 286          i915_texture_set_image_offset(tex, level, i, 0, i * stack_nblocksy);
 287
 288       depth = u_minify(depth, 1);
 289    }
 290
 291    /* Multiply slice size by texture depth for total size.  It's
 292     * remarkable how wasteful of memory the i915 texture layouts
 293     * are.  They are largely fixed in the i945.
 294     */
 295    tex->total_nblocksy = stack_nblocksy * pt->depth0;
 296 }
 297
 298 static void
 299 i915_texture_layout_cube(struct i915_texture *tex)
 300 {
 301    struct pipe_resource *pt = &tex->b.b;
 302    unsigned width = pt->width0, height = pt->height0;
 303    const unsigned nblocks = util_format_get_nblocksx(pt->format, pt->width0);
 304    unsigned level;
 305    unsigned face;
 306
 307    assert(width == height); /* cubemap images are square */
 308
 309    /* double pitch for cube layouts */
 310    tex->stride = align(nblocks * util_format_get_blocksize(pt->format) * 2, 4);
 311    tex->total_nblocksy = nblocks * 4;
 312
 313    for (level = 0; level <= pt->last_level; level++) {
 314       i915_texture_set_level_info(tex, level, 6, width, height, 1);
 315       width /= 2;
 316       height /= 2;
 317    }
 318
 319    for (face = 0; face < 6; face++) {
 320       unsigned x = initial_offsets[face][0] * nblocks;
 321       unsigned y = initial_offsets[face][1] * nblocks;
 322       unsigned d = nblocks;
 323
 324       for (level = 0; level <= pt->last_level; level++) {
 325          i915_texture_set_image_offset(tex, level, face, x, y);
 326          d >>= 1;
 327          x += step_offsets[face][0] * d;
 328          y += step_offsets[face][1] * d;
 329       }
 330    }
 331 }
 332
 333 static boolean
 334 i915_texture_layout(struct i915_texture * tex)
 335 {
 336    struct pipe_resource *pt = &tex->b.b;
 337
 338    switch (pt->target) {
 339    case PIPE_TEXTURE_1D:
 340    case PIPE_TEXTURE_2D:
 341       i915_texture_layout_2d(tex);
 342       break;
 343    case PIPE_TEXTURE_3D:
 344       i915_texture_layout_3d(tex);
 345       break;
 346    case PIPE_TEXTURE_CUBE:
 347       i915_texture_layout_cube(tex);
 348       break;
 349    default:
 350       assert(0);
 351       return FALSE;
 352    }
 353
 354    return TRUE;
 355 }
 356
 357
 358 /*
 359  * i945 layout functions
 360  */
 361
 362
 363 static void
 364 i945_texture_layout_2d(struct i915_texture *tex)
 365 {
 366    struct pipe_resource *pt = &tex->b.b;
 367    const int align_x = 2, align_y = 4;
 368    unsigned level;
 369    unsigned x = 0;
 370    unsigned y = 0;
 371    unsigned width = pt->width0;
 372    unsigned height = pt->height0;
 373    unsigned nblocksx = util_format_get_nblocksx(pt->format, pt->width0);
 374    unsigned nblocksy = util_format_get_nblocksy(pt->format, pt->height0);
 375
 376    /* used for scanouts that need special layouts */
 377    if (tex->b.b.bind & PIPE_BIND_SCANOUT)
 378       if (i915_scanout_layout(tex))
 379          return;
 380
 381    /* shared buffers needs to be compatible with X servers */
 382    if (tex->b.b.bind & PIPE_BIND_SHARED)
 383       if (i915_display_target_layout(tex))
 384          return;
 385
 386    tex->stride = align(util_format_get_stride(pt->format, pt->width0), 4);
 387
 388    /* May need to adjust pitch to accomodate the placement of
 389     * the 2nd mipmap level.  This occurs when the alignment
 390     * constraints of mipmap placement push the right edge of the
 391     * 2nd mipmap level out past the width of its parent.
 392     */
 393    if (pt->last_level > 0) {
 394       unsigned mip1_nblocksx
 395          = align(util_format_get_nblocksx(pt->format, u_minify(width, 1)), align_x)
 396          + util_format_get_nblocksx(pt->format, u_minify(width, 2));
 397
 398       if (mip1_nblocksx > nblocksx)
 399          tex->stride = mip1_nblocksx * util_format_get_blocksize(pt->format);
 400    }
 401
 402    /* Pitch must be a whole number of dwords
 403     */
 404    tex->stride = align(tex->stride, 64);
 405    tex->total_nblocksy = 0;
 406
 407    for (level = 0; level <= pt->last_level; level++) {
 408       i915_texture_set_level_info(tex, level, 1, width, height, 1);
 409       i915_texture_set_image_offset(tex, level, 0, x, y);
 410
 411       nblocksy = align(nblocksy, align_y);
 412
 413       /* Because the images are packed better, the final offset
 414        * might not be the maximal one:
 415        */
 416       tex->total_nblocksy = MAX2(tex->total_nblocksy, y + nblocksy);
 417
 418       /* Layout_below: step right after second mipmap level.
 419        */
 420       if (level == 1) {
 421          x += align(nblocksx, align_x);
 422       }
 423       else {
 424          y += nblocksy;
 425       }
 426
 427       width  = u_minify(width, 1);
 428       height = u_minify(height, 1);
 429       nblocksx = util_format_get_nblocksx(pt->format, width);
 430       nblocksy = util_format_get_nblocksy(pt->format, height);
 431    }
 432 }
 433
 434 static void
 435 i945_texture_layout_3d(struct i915_texture *tex)
 436 {
 437    struct pipe_resource *pt = &tex->b.b;
 438    unsigned width = pt->width0;
 439    unsigned height = pt->height0;
 440    unsigned depth = pt->depth0;
 441    unsigned nblocksy = util_format_get_nblocksy(pt->format, pt->width0);
 442    unsigned pack_x_pitch, pack_x_nr;
 443    unsigned pack_y_pitch;
 444    unsigned level;
 445
 446    tex->stride = align(util_format_get_stride(pt->format, pt->width0), 4);
 447    tex->total_nblocksy = 0;
 448
 449    pack_y_pitch = MAX2(nblocksy, 2);
 450    pack_x_pitch = tex->stride / util_format_get_blocksize(pt->format);
 451    pack_x_nr = 1;
 452
 453    for (level = 0; level <= pt->last_level; level++) {
 454       int x = 0;
 455       int y = 0;
 456       unsigned q, j;
 457
 458       i915_texture_set_level_info(tex, level, depth, width, height, depth);
 459
 460       for (q = 0; q < depth;) {
 461          for (j = 0; j < pack_x_nr && q < depth; j++, q++) {
 462             i915_texture_set_image_offset(tex, level, q, x, y + tex->total_nblocksy);
 463             x += pack_x_pitch;
 464          }
 465
 466          x = 0;
 467          y += pack_y_pitch;
 468       }
 469
 470       tex->total_nblocksy += y;
 471
 472       if (pack_x_pitch > 4) {
 473          pack_x_pitch >>= 1;
 474          pack_x_nr <<= 1;
 475          assert(pack_x_pitch * pack_x_nr * util_format_get_blocksize(pt->format) <= tex->stride);
 476       }
 477
 478       if (pack_y_pitch > 2) {
 479          pack_y_pitch >>= 1;
 480       }
 481
 482       width = u_minify(width, 1);
 483       height = u_minify(height, 1);
 484       depth = u_minify(depth, 1);
 485       nblocksy = util_format_get_nblocksy(pt->format, height);
 486    }
 487 }
 488
 489 static void
 490 i945_texture_layout_cube(struct i915_texture *tex)
 491 {
 492    struct pipe_resource *pt = &tex->b.b;
 493    unsigned level;
 494
 495    const unsigned nblocks = util_format_get_nblocksx(pt->format, pt->width0);
 496    unsigned face;
 497    unsigned width = pt->width0;
 498    unsigned height = pt->height0;
 499
 500    /*
 501    printf("%s %i, %i\n", __FUNCTION__, pt->width0, pt->height0);
 502    */
 503
 504    assert(width == height); /* cubemap images are square */
 505
 506    /*
 507     * XXX Should only be used for compressed formats. But lets
 508     * keep this code active just in case.
 509     *
 510     * Depending on the size of the largest images, pitch can be
 511     * determined either by the old-style packing of cubemap faces,
 512     * or the final row of 4x4, 2x2 and 1x1 faces below this.
 513     */
 514    if (nblocks > 32)
 515       tex->stride = align(nblocks * util_format_get_blocksize(pt->format) * 2, 4);
 516    else
 517       tex->stride = 14 * 8 * util_format_get_blocksize(pt->format);
 518
 519    tex->total_nblocksy = nblocks * 4;
 520
 521    /* Set all the levels to effectively occupy the whole rectangular region.
 522    */
 523    for (level = 0; level <= pt->last_level; level++) {
 524       i915_texture_set_level_info(tex, level, 6, width, height, 1);
 525       width /= 2;
 526       height /= 2;
 527    }
 528
 529    for (face = 0; face < 6; face++) {
 530       unsigned x = initial_offsets[face][0] * nblocks;
 531       unsigned y = initial_offsets[face][1] * nblocks;
 532       unsigned d = nblocks;
 533
 534 #if 0 /* Fix and enable this code for compressed formats */
 535       if (nblocks == 4 && face >= 4) {
 536          y = tex->total_height - 4;
 537          x = (face - 4) * 8;
 538       }
 539       else if (nblocks < 4 && (face > 0)) {
 540          y = tex->total_height - 4;
 541          x = face * 8;
 542       }
 543 #endif
 544
 545       for (level = 0; level <= pt->last_level; level++) {
 546          i915_texture_set_image_offset(tex, level, face, x, y);
 547
 548          d >>= 1;
 549
 550 #if 0 /* Fix and enable this code for compressed formats */
 551          switch (d) {
 552             case 4:
 553                switch (face) {
 554                   case PIPE_TEX_FACE_POS_X:
 555                   case PIPE_TEX_FACE_NEG_X:
 556                      x += step_offsets[face][0] * d;
 557                      y += step_offsets[face][1] * d;
 558                      break;
 559                   case PIPE_TEX_FACE_POS_Y:
 560                   case PIPE_TEX_FACE_NEG_Y:
 561                      y += 12;
 562                      x -= 8;
 563                      break;
 564                   case PIPE_TEX_FACE_POS_Z:
 565                   case PIPE_TEX_FACE_NEG_Z:
 566                      y = tex->total_height - 4;
 567                      x = (face - 4) * 8;
 568                      break;
 569                }
 570             case 2:
 571                y = tex->total_height - 4;
 572                x = 16 + face * 8;
 573                break;
 574
 575             case 1:
 576                x += 48;
 577                break;
 578             default:
 579 #endif
 580                x += step_offsets[face][0] * d;
 581                y += step_offsets[face][1] * d;
 582 #if 0
 583                break;
 584          }
 585 #endif
 586       }
 587    }
 588 }
 589
 590 static boolean
 591 i945_texture_layout(struct i915_texture * tex)
 592 {
 593    struct pipe_resource *pt = &tex->b.b;
 594
 595    switch (pt->target) {
 596    case PIPE_TEXTURE_1D:
 597    case PIPE_TEXTURE_2D:
 598       i945_texture_layout_2d(tex);
 599       break;
 600    case PIPE_TEXTURE_3D:
 601       i945_texture_layout_3d(tex);
 602       break;
 603    case PIPE_TEXTURE_CUBE:
 604       i945_texture_layout_cube(tex);
 605       break;
 606    default:
 607       assert(0);
 608       return FALSE;
 609    }
 610
 611    return TRUE;
 612 }
 613
 614
 615
 616 /*
 617  * Screen texture functions
 618  */
 619
 620
 621
 622 static boolean
 623 i915_texture_get_handle(struct pipe_screen * screen,
 624                         struct pipe_resource *texture,
 625                         struct winsys_handle *whandle)
 626 {
 627    struct i915_screen *is = i915_screen(screen);
 628    struct i915_texture *tex = i915_texture(texture);
 629    struct i915_winsys *iws = is->iws;
 630
 631    return iws->buffer_get_handle(iws, tex->buffer, whandle, tex->stride);
 632 }
 633
 634
 635 static void
 636 i915_texture_destroy(struct pipe_screen *screen,
 637                      struct pipe_resource *pt)
 638 {
 639    struct i915_texture *tex = i915_texture(pt);
 640    struct i915_winsys *iws = i915_screen(screen)->iws;
 641    uint i;
 642
 643    /*
 644      DBG("%s deleting %p\n", __FUNCTION__, (void *) tex);
 645    */
 646
 647    iws->buffer_destroy(iws, tex->buffer);
 648
 649    for (i = 0; i < Elements(tex->image_offset); i++)
 650       if (tex->image_offset[i])
 651          FREE(tex->image_offset[i]);
 652
 653    FREE(tex);
 654 }
 655
 656 static struct pipe_transfer *
 657 i915_texture_get_transfer(struct pipe_context *context,
 658                           struct pipe_resource *resource,
 659                           struct pipe_subresource sr,
 660                           unsigned usage,
 661                           const struct pipe_box *box)
 662 {
 663    struct i915_texture *tex = i915_texture(resource);
 664    struct pipe_transfer *transfer = CALLOC_STRUCT(pipe_transfer);
 665    if (transfer == NULL)
 666       return NULL;
 667
 668    transfer->resource = resource;
 669    transfer->sr = sr;
 670    transfer->usage = usage;
 671    transfer->box = *box;
 672    transfer->stride = tex->stride;
 673
 674    return transfer;
 675 }
 676
 677
 678 static void *
 679 i915_texture_transfer_map(struct pipe_context *pipe,
 680                           struct pipe_transfer *transfer)
 681 {
 682    struct pipe_resource *resource = transfer->resource;
 683    struct i915_texture *tex = i915_texture(resource);
 684    struct i915_winsys *iws = i915_screen(pipe->screen)->iws;
 685    struct pipe_subresource sr = transfer->sr;
 686    struct pipe_box *box = &transfer->box;
 687    enum pipe_format format = resource->format;
 688    unsigned offset;
 689    char *map;
 690
 691    if (resource->target == PIPE_TEXTURE_CUBE) {
 692       offset = tex->image_offset[sr.level][sr.face];
 693    }
 694    else if (resource->target == PIPE_TEXTURE_3D) {
 695       offset = tex->image_offset[sr.level][box->z];
 696    }
 697    else {
 698       offset = tex->image_offset[sr.level][0];
 699       assert(sr.face == 0);
 700       assert(box->z == 0);
 701    }
 702
 703    map = iws->buffer_map(iws,
 704                          tex->buffer,
 705                          (transfer->usage & PIPE_TRANSFER_WRITE) ? TRUE : FALSE);
 706    if (map == NULL)
 707       return NULL;
 708
 709    return map + offset +
 710       box->y / util_format_get_blockheight(format) * transfer->stride +
 711       box->x / util_format_get_blockwidth(format) * util_format_get_blocksize(format);
 712 }
 713
 714 static void
 715 i915_texture_transfer_unmap(struct pipe_context *pipe,
 716                             struct pipe_transfer *transfer)
 717 {
 718    struct i915_texture *tex = i915_texture(transfer->resource);
 719    struct i915_winsys *iws = i915_screen(tex->b.b.screen)->iws;
 720    iws->buffer_unmap(iws, tex->buffer);
 721 }
 722
 723
 724
 725 struct u_resource_vtbl i915_texture_vtbl =
 726 {
 727    i915_texture_get_handle,           /* get_handle */
 728    i915_texture_destroy,              /* resource_destroy */
 729    NULL,                              /* is_resource_referenced */
 730    i915_texture_get_transfer,         /* get_transfer */
 731    u_default_transfer_destroy,        /* transfer_destroy */
 732    i915_texture_transfer_map,         /* transfer_map */
 733    u_default_transfer_flush_region,   /* transfer_flush_region */
 734    i915_texture_transfer_unmap,       /* transfer_unmap */
 735    u_default_transfer_inline_write    /* transfer_inline_write */
 736 };
 737
 738
 739
 740
 741 struct pipe_resource *
 742 i915_texture_create(struct pipe_screen *screen,
 743                     const struct pipe_resource *template)
 744 {
 745    struct i915_screen *is = i915_screen(screen);
 746    struct i915_winsys *iws = is->iws;
 747    struct i915_texture *tex = CALLOC_STRUCT(i915_texture);
 748    size_t tex_size;
 749    unsigned buf_usage = 0;
 750
 751    if (!tex)
 752       return NULL;
 753
 754    tex->b.b = *template;
 755    tex->b.vtbl = &i915_texture_vtbl;
 756    pipe_reference_init(&tex->b.b.reference, 1);
 757    tex->b.b.screen = screen;
 758
 759    if (is->is_i945) {
 760       if (!i945_texture_layout(tex))
 761          goto fail;
 762    } else {
 763       if (!i915_texture_layout(tex))
 764          goto fail;
 765    }
 766
 767    tex_size = tex->stride * tex->total_nblocksy;
 768
 769    /* for scanouts and cursors, cursors arn't scanouts */
 770
 771    /* XXX: use a custom flag for cursors, don't rely on magically
 772     * guessing that this is Xorg asking for a cursor
 773     */
 774    if ((template->bind & PIPE_BIND_SCANOUT) && template->width0 != 64)
 775       buf_usage = I915_NEW_SCANOUT;
 776    else
 777       buf_usage = I915_NEW_TEXTURE;
 778
 779    tex->buffer = iws->buffer_create(iws, tex_size, 64, buf_usage);
 780    if (!tex->buffer)
 781       goto fail;
 782
 783    /* setup any hw fences */
 784    if (tex->hw_tiled) {
 785       assert(tex->sw_tiled == I915_TILE_NONE);
 786       iws->buffer_set_fence_reg(iws, tex->buffer, tex->stride, tex->hw_tiled);
 787    }
 788
 789
 790 #if 0
 791    void *ptr = ws->buffer_map(ws, tex->buffer,
 792       PIPE_BUFFER_USAGE_CPU_WRITE);
 793    memset(ptr, 0x80, tex_size);
 794    ws->buffer_unmap(ws, tex->buffer);
 795 #endif
 796
 797    return &tex->b.b;
 798
 799 fail:
 800    FREE(tex);
 801    return NULL;
 802 }
 803
 804 struct pipe_resource *
 805 i915_texture_from_handle(struct pipe_screen * screen,
 806                           const struct pipe_resource *template,
 807                           struct winsys_handle *whandle)
 808 {
 809    struct i915_screen *is = i915_screen(screen);
 810    struct i915_texture *tex;
 811    struct i915_winsys *iws = is->iws;
 812    struct i915_winsys_buffer *buffer;
 813    unsigned stride;
 814
 815    assert(screen);
 816
 817    buffer = iws->buffer_from_handle(iws, whandle, &stride);
 818
 819    /* Only supports one type */
 820    if (template->target != PIPE_TEXTURE_2D ||
 821        template->last_level != 0 ||
 822        template->depth0 != 1) {
 823       return NULL;
 824    }
 825
 826    tex = CALLOC_STRUCT(i915_texture);
 827    if (!tex)
 828       return NULL;
 829
 830    tex->b.b = *template;
 831    tex->b.vtbl = &i915_texture_vtbl;
 832    pipe_reference_init(&tex->b.b.reference, 1);
 833    tex->b.b.screen = screen;
 834
 835    tex->stride = stride;
 836
 837    i915_texture_set_level_info(tex, 0, 1, template->width0, template->height0, 1);
 838    i915_texture_set_image_offset(tex, 0, 0, 0, 0);
 839
 840    tex->buffer = buffer;
 841
 842    return &tex->b.b;
 843 }
 844