src/gallium/auxiliary/util/u_surface.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.  All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  20  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  **************************************************************************/
  26
  27 /**
  28  * @file
  29  * Surface utility functions.
  30  *
  31  * @author Brian Paul
  32  */
  33
  34
  35 #include "pipe/p_defines.h"
  36 #include "pipe/p_screen.h"
  37 #include "pipe/p_state.h"
  38
  39 #include "util/u_format.h"
  40 #include "util/u_inlines.h"
  41 #include "util/u_rect.h"
  42 #include "util/u_surface.h"
  43 #include "util/u_pack_color.h"
  44
  45
  46 /**
  47  * Initialize a pipe_surface object.  'view' is considered to have
  48  * uninitialized contents.
  49  */
  50 void
  51 u_surface_default_template(struct pipe_surface *surf,
  52                            const struct pipe_resource *texture)
  53 {
  54    memset(surf, 0, sizeof(*surf));
  55
  56    surf->format = texture->format;
  57 }
  58
  59
  60 /**
  61  * Copy 2D rect from one place to another.
  62  * Position and sizes are in pixels.
  63  * src_stride may be negative to do vertical flip of pixels from source.
  64  */
  65 void
  66 util_copy_rect(ubyte * dst,
  67                enum pipe_format format,
  68                unsigned dst_stride,
  69                unsigned dst_x,
  70                unsigned dst_y,
  71                unsigned width,
  72                unsigned height,
  73                const ubyte * src,
  74                int src_stride,
  75                unsigned src_x,
  76                unsigned src_y)
  77 {
  78    unsigned i;
  79    int src_stride_pos = src_stride < 0 ? -src_stride : src_stride;
  80    int blocksize = util_format_get_blocksize(format);
  81    int blockwidth = util_format_get_blockwidth(format);
  82    int blockheight = util_format_get_blockheight(format);
  83
  84    assert(blocksize > 0);
  85    assert(blockwidth > 0);
  86    assert(blockheight > 0);
  87
  88    dst_x /= blockwidth;
  89    dst_y /= blockheight;
  90    width = (width + blockwidth - 1)/blockwidth;
  91    height = (height + blockheight - 1)/blockheight;
  92    src_x /= blockwidth;
  93    src_y /= blockheight;
  94
  95    dst += dst_x * blocksize;
  96    src += src_x * blocksize;
  97    dst += dst_y * dst_stride;
  98    src += src_y * src_stride_pos;
  99    width *= blocksize;
 100
 101    if (width == dst_stride && width == src_stride)
 102       memcpy(dst, src, height * width);
 103    else {
 104       for (i = 0; i < height; i++) {
 105          memcpy(dst, src, width);
 106          dst += dst_stride;
 107          src += src_stride;
 108       }
 109    }
 110 }
 111
 112
 113 /**
 114  * Copy 3D box from one place to another.
 115  * Position and sizes are in pixels.
 116  */
 117 void
 118 util_copy_box(ubyte * dst,
 119               enum pipe_format format,
 120               unsigned dst_stride, unsigned dst_slice_stride,
 121               unsigned dst_x, unsigned dst_y, unsigned dst_z,
 122               unsigned width, unsigned height, unsigned depth,
 123               const ubyte * src,
 124               int src_stride, unsigned src_slice_stride,
 125               unsigned src_x, unsigned src_y, unsigned src_z)
 126 {
 127    unsigned z;
 128    dst += dst_z * dst_slice_stride;
 129    src += src_z * src_slice_stride;
 130    for (z = 0; z < depth; ++z) {
 131       util_copy_rect(dst,
 132                      format,
 133                      dst_stride,
 134                      dst_x, dst_y,
 135                      width, height,
 136                      src,
 137                      src_stride,
 138                      src_x, src_y);
 139
 140       dst += dst_slice_stride;
 141       src += src_slice_stride;
 142    }
 143 }
 144
 145
 146 void
 147 util_fill_rect(ubyte * dst,
 148                enum pipe_format format,
 149                unsigned dst_stride,
 150                unsigned dst_x,
 151                unsigned dst_y,
 152                unsigned width,
 153                unsigned height,
 154                union util_color *uc)
 155 {
 156    const struct util_format_description *desc = util_format_description(format);
 157    unsigned i, j;
 158    unsigned width_size;
 159    int blocksize = desc->block.bits / 8;
 160    int blockwidth = desc->block.width;
 161    int blockheight = desc->block.height;
 162
 163    assert(blocksize > 0);
 164    assert(blockwidth > 0);
 165    assert(blockheight > 0);
 166
 167    dst_x /= blockwidth;
 168    dst_y /= blockheight;
 169    width = (width + blockwidth - 1)/blockwidth;
 170    height = (height + blockheight - 1)/blockheight;
 171
 172    dst += dst_x * blocksize;
 173    dst += dst_y * dst_stride;
 174    width_size = width * blocksize;
 175
 176    switch (blocksize) {
 177    case 1:
 178       if(dst_stride == width_size)
 179          memset(dst, uc->ub, height * width_size);
 180       else {
 181          for (i = 0; i < height; i++) {
 182             memset(dst, uc->ub, width_size);
 183             dst += dst_stride;
 184          }
 185       }
 186       break;
 187    case 2:
 188       for (i = 0; i < height; i++) {
 189          uint16_t *row = (uint16_t *)dst;
 190          for (j = 0; j < width; j++)
 191             *row++ = uc->us;
 192          dst += dst_stride;
 193       }
 194       break;
 195    case 4:
 196       for (i = 0; i < height; i++) {
 197          uint32_t *row = (uint32_t *)dst;
 198          for (j = 0; j < width; j++)
 199             *row++ = uc->ui[0];
 200          dst += dst_stride;
 201       }
 202       break;
 203    default:
 204       for (i = 0; i < height; i++) {
 205          ubyte *row = dst;
 206          for (j = 0; j < width; j++) {
 207             memcpy(row, uc, blocksize);
 208             row += blocksize;
 209          }
 210          dst += dst_stride;
 211       }
 212       break;
 213    }
 214 }
 215
 216
 217 void
 218 util_fill_box(ubyte * dst,
 219               enum pipe_format format,
 220               unsigned stride,
 221               unsigned layer_stride,
 222               unsigned x,
 223               unsigned y,
 224               unsigned z,
 225               unsigned width,
 226               unsigned height,
 227               unsigned depth,
 228               union util_color *uc)
 229 {
 230    unsigned layer;
 231    dst += z * layer_stride;
 232    for (layer = z; layer < depth; layer++) {
 233       util_fill_rect(dst, format,
 234                      stride,
 235                      x, y, width, height, uc);
 236       dst += layer_stride;
 237    }
 238 }
 239
 240
 241 /** Mipmap level size computation, with minimum block size */
 242 static inline unsigned
 243 minify(unsigned value, unsigned levels, unsigned blocksize)
 244 {
 245    return MAX2(blocksize, value >> levels);
 246 }
 247
 248
 249 /**
 250  * Fallback function for pipe->resource_copy_region().
 251  * We support copying between different formats (including compressed/
 252  * uncompressed) if the bytes per block or pixel matches.  If copying
 253  * compressed -> uncompressed, the dst region is reduced by the block
 254  * width, height.  If copying uncompressed -> compressed, the dest region
 255  * is expanded by the block width, height.  See GL_ARB_copy_image.
 256  * Note: (X,Y)=(0,0) is always the upper-left corner.
 257  */
 258 void
 259 util_resource_copy_region(struct pipe_context *pipe,
 260                           struct pipe_resource *dst,
 261                           unsigned dst_level,
 262                           unsigned dst_x, unsigned dst_y, unsigned dst_z,
 263                           struct pipe_resource *src,
 264                           unsigned src_level,
 265                           const struct pipe_box *src_box_in)
 266 {
 267    struct pipe_transfer *src_trans, *dst_trans;
 268    uint8_t *dst_map;
 269    const uint8_t *src_map;
 270    MAYBE_UNUSED enum pipe_format src_format;
 271    enum pipe_format dst_format;
 272    struct pipe_box src_box, dst_box;
 273    unsigned src_bs, dst_bs, src_bw, dst_bw, src_bh, dst_bh;
 274
 275    assert(src && dst);
 276    if (!src || !dst)
 277       return;
 278
 279    assert((src->target == PIPE_BUFFER && dst->target == PIPE_BUFFER) ||
 280           (src->target != PIPE_BUFFER && dst->target != PIPE_BUFFER));
 281
 282    src_format = src->format;
 283    dst_format = dst->format;
 284
 285    /* init src box */
 286    src_box = *src_box_in;
 287
 288    /* init dst box */
 289    dst_box.x = dst_x;
 290    dst_box.y = dst_y;
 291    dst_box.z = dst_z;
 292    dst_box.width  = src_box.width;
 293    dst_box.height = src_box.height;
 294    dst_box.depth  = src_box.depth;
 295
 296    src_bs = util_format_get_blocksize(src_format);
 297    src_bw = util_format_get_blockwidth(src_format);
 298    src_bh = util_format_get_blockheight(src_format);
 299    dst_bs = util_format_get_blocksize(dst_format);
 300    dst_bw = util_format_get_blockwidth(dst_format);
 301    dst_bh = util_format_get_blockheight(dst_format);
 302
 303    /* Note: all box positions and sizes are in pixels */
 304    if (src_bw > 1 && dst_bw == 1) {
 305       /* Copy from compressed to uncompressed.
 306        * Shrink dest box by the src block size.
 307        */
 308       dst_box.width /= src_bw;
 309       dst_box.height /= src_bh;
 310    }
 311    else if (src_bw == 1 && dst_bw > 1) {
 312       /* Copy from uncompressed to compressed.
 313        * Expand dest box by the dest block size.
 314        */
 315       dst_box.width *= dst_bw;
 316       dst_box.height *= dst_bh;
 317    }
 318    else {
 319       /* compressed -> compressed or uncompressed -> uncompressed copy */
 320       assert(src_bw == dst_bw);
 321       assert(src_bh == dst_bh);
 322    }
 323
 324    assert(src_bs == dst_bs);
 325    if (src_bs != dst_bs) {
 326       /* This can happen if we fail to do format checking before hand.
 327        * Don't crash below.
 328        */
 329       return;
 330    }
 331
 332    /* check that region boxes are block aligned */
 333    assert(src_box.x % src_bw == 0);
 334    assert(src_box.y % src_bh == 0);
 335    assert(src_box.width % src_bw == 0 ||
 336           src_box.x + src_box.width == minify(src->width0, src_level, src_bw));
 337    assert(src_box.height % src_bh == 0 ||
 338           src_box.y + src_box.height == minify(src->height0, src_level, src_bh));
 339    assert(dst_box.x % dst_bw == 0);
 340    assert(dst_box.y % dst_bh == 0);
 341    assert(dst_box.width % dst_bw == 0 ||
 342           dst_box.x + dst_box.width == minify(dst->width0, dst_level, dst_bw));
 343    assert(dst_box.height % dst_bh == 0 ||
 344           dst_box.y + dst_box.height == minify(dst->height0, dst_level, dst_bh));
 345
 346    /* check that region boxes are not out of bounds */
 347    assert(src_box.x + src_box.width <=
 348           minify(src->width0, src_level, src_bw));
 349    assert(src_box.y + src_box.height <=
 350           minify(src->height0, src_level, src_bh));
 351    assert(dst_box.x + dst_box.width <=
 352           minify(dst->width0, dst_level, dst_bw));
 353    assert(dst_box.y + dst_box.height <=
 354           minify(dst->height0, dst_level, dst_bh));
 355
 356    /* check that total number of src, dest bytes match */
 357    assert((src_box.width / src_bw) * (src_box.height / src_bh) * src_bs ==
 358           (dst_box.width / dst_bw) * (dst_box.height / dst_bh) * dst_bs);
 359
 360    src_map = pipe->transfer_map(pipe,
 361                                 src,
 362                                 src_level,
 363                                 PIPE_TRANSFER_READ,
 364                                 &src_box, &src_trans);
 365    assert(src_map);
 366    if (!src_map) {
 367       goto no_src_map;
 368    }
 369
 370    dst_map = pipe->transfer_map(pipe,
 371                                 dst,
 372                                 dst_level,
 373                                 PIPE_TRANSFER_WRITE |
 374                                 PIPE_TRANSFER_DISCARD_RANGE, &dst_box,
 375                                 &dst_trans);
 376    assert(dst_map);
 377    if (!dst_map) {
 378       goto no_dst_map;
 379    }
 380
 381    if (dst->target == PIPE_BUFFER && src->target == PIPE_BUFFER) {
 382       assert(src_box.height == 1);
 383       assert(src_box.depth == 1);
 384       memcpy(dst_map, src_map, src_box.width);
 385    } else {
 386       util_copy_box(dst_map,
 387                     src_format,
 388                     dst_trans->stride, dst_trans->layer_stride,
 389                     0, 0, 0,
 390                     src_box.width, src_box.height, src_box.depth,
 391                     src_map,
 392                     src_trans->stride, src_trans->layer_stride,
 393                     0, 0, 0);
 394    }
 395
 396    pipe->transfer_unmap(pipe, dst_trans);
 397 no_dst_map:
 398    pipe->transfer_unmap(pipe, src_trans);
 399 no_src_map:
 400    ;
 401 }
 402
 403
 404
 405 #define UBYTE_TO_USHORT(B) ((B) | ((B) << 8))
 406
 407
 408 /**
 409  * Fallback for pipe->clear_render_target() function.
 410  * XXX this looks too hackish to be really useful.
 411  * cpp > 4 looks like a gross hack at best...
 412  * Plus can't use these transfer fallbacks when clearing
 413  * multisampled surfaces for instance.
 414  * Clears all bound layers.
 415  */
 416 void
 417 util_clear_render_target(struct pipe_context *pipe,
 418                          struct pipe_surface *dst,
 419                          const union pipe_color_union *color,
 420                          unsigned dstx, unsigned dsty,
 421                          unsigned width, unsigned height)
 422 {
 423    struct pipe_transfer *dst_trans;
 424    ubyte *dst_map;
 425    union util_color uc;
 426    unsigned max_layer;
 427
 428    assert(dst->texture);
 429    if (!dst->texture)
 430       return;
 431
 432    if (dst->texture->target == PIPE_BUFFER) {
 433       /*
 434        * The fill naturally works on the surface format, however
 435        * the transfer uses resource format which is just bytes for buffers.
 436        */
 437       unsigned dx, w;
 438       unsigned pixstride = util_format_get_blocksize(dst->format);
 439       dx = (dst->u.buf.first_element + dstx) * pixstride;
 440       w = width * pixstride;
 441       max_layer = 0;
 442       dst_map = pipe_transfer_map(pipe,
 443                                   dst->texture,
 444                                   0, 0,
 445                                   PIPE_TRANSFER_WRITE,
 446                                   dx, 0, w, 1,
 447                                   &dst_trans);
 448    }
 449    else {
 450       max_layer = dst->u.tex.last_layer - dst->u.tex.first_layer;
 451       dst_map = pipe_transfer_map_3d(pipe,
 452                                      dst->texture,
 453                                      dst->u.tex.level,
 454                                      PIPE_TRANSFER_WRITE,
 455                                      dstx, dsty, dst->u.tex.first_layer,
 456                                      width, height, max_layer + 1, &dst_trans);
 457    }
 458
 459    assert(dst_map);
 460
 461    if (dst_map) {
 462       enum pipe_format format = dst->format;
 463       assert(dst_trans->stride > 0);
 464
 465       if (util_format_is_pure_integer(format)) {
 466          /*
 467           * We expect int/uint clear values here, though some APIs
 468           * might disagree (but in any case util_pack_color()
 469           * couldn't handle it)...
 470           */
 471          if (util_format_is_pure_sint(format)) {
 472             util_format_write_4i(format, color->i, 0, &uc, 0, 0, 0, 1, 1);
 473          }
 474          else {
 475             assert(util_format_is_pure_uint(format));
 476             util_format_write_4ui(format, color->ui, 0, &uc, 0, 0, 0, 1, 1);
 477          }
 478       }
 479       else {
 480          util_pack_color(color->f, format, &uc);
 481       }
 482
 483       util_fill_box(dst_map, dst->format,
 484                     dst_trans->stride, dst_trans->layer_stride,
 485                     0, 0, 0, width, height, max_layer + 1, &uc);
 486
 487       pipe->transfer_unmap(pipe, dst_trans);
 488    }
 489 }
 490
 491 /**
 492  * Fallback for pipe->clear_stencil() function.
 493  * sw fallback doesn't look terribly useful here.
 494  * Plus can't use these transfer fallbacks when clearing
 495  * multisampled surfaces for instance.
 496  * Clears all bound layers.
 497  */
 498 void
 499 util_clear_depth_stencil(struct pipe_context *pipe,
 500                          struct pipe_surface *dst,
 501                          unsigned clear_flags,
 502                          double depth,
 503                          unsigned stencil,
 504                          unsigned dstx, unsigned dsty,
 505                          unsigned width, unsigned height)
 506 {
 507    enum pipe_format format = dst->format;
 508    struct pipe_transfer *dst_trans;
 509    ubyte *dst_map;
 510    boolean need_rmw = FALSE;
 511    unsigned max_layer, layer;
 512
 513    if ((clear_flags & PIPE_CLEAR_DEPTHSTENCIL) &&
 514        ((clear_flags & PIPE_CLEAR_DEPTHSTENCIL) != PIPE_CLEAR_DEPTHSTENCIL) &&
 515        util_format_is_depth_and_stencil(format))
 516       need_rmw = TRUE;
 517
 518    assert(dst->texture);
 519    if (!dst->texture)
 520       return;
 521
 522    max_layer = dst->u.tex.last_layer - dst->u.tex.first_layer;
 523    dst_map = pipe_transfer_map_3d(pipe,
 524                                   dst->texture,
 525                                   dst->u.tex.level,
 526                                   (need_rmw ? PIPE_TRANSFER_READ_WRITE :
 527                                               PIPE_TRANSFER_WRITE),
 528                                   dstx, dsty, dst->u.tex.first_layer,
 529                                   width, height, max_layer + 1, &dst_trans);
 530    assert(dst_map);
 531
 532    if (dst_map) {
 533       unsigned dst_stride = dst_trans->stride;
 534       uint64_t zstencil = util_pack64_z_stencil(format, depth, stencil);
 535       ubyte *dst_layer = dst_map;
 536       unsigned i, j;
 537       assert(dst_trans->stride > 0);
 538
 539       for (layer = 0; layer <= max_layer; layer++) {
 540          dst_map = dst_layer;
 541
 542          switch (util_format_get_blocksize(format)) {
 543          case 1:
 544             assert(format == PIPE_FORMAT_S8_UINT);
 545             if(dst_stride == width)
 546                memset(dst_map, (uint8_t) zstencil, height * width);
 547             else {
 548                for (i = 0; i < height; i++) {
 549                   memset(dst_map, (uint8_t) zstencil, width);
 550                   dst_map += dst_stride;
 551                }
 552             }
 553             break;
 554          case 2:
 555             assert(format == PIPE_FORMAT_Z16_UNORM);
 556             for (i = 0; i < height; i++) {
 557                uint16_t *row = (uint16_t *)dst_map;
 558                for (j = 0; j < width; j++)
 559                   *row++ = (uint16_t) zstencil;
 560                dst_map += dst_stride;
 561                }
 562             break;
 563          case 4:
 564             if (!need_rmw) {
 565                for (i = 0; i < height; i++) {
 566                   uint32_t *row = (uint32_t *)dst_map;
 567                   for (j = 0; j < width; j++)
 568                      *row++ = (uint32_t) zstencil;
 569                   dst_map += dst_stride;
 570                }
 571             }
 572             else {
 573                uint32_t dst_mask;
 574                if (format == PIPE_FORMAT_Z24_UNORM_S8_UINT)
 575                   dst_mask = 0x00ffffff;
 576                else {
 577                   assert(format == PIPE_FORMAT_S8_UINT_Z24_UNORM);
 578                   dst_mask = 0xffffff00;
 579                }
 580                if (clear_flags & PIPE_CLEAR_DEPTH)
 581                   dst_mask = ~dst_mask;
 582                for (i = 0; i < height; i++) {
 583                   uint32_t *row = (uint32_t *)dst_map;
 584                   for (j = 0; j < width; j++) {
 585                      uint32_t tmp = *row & dst_mask;
 586                      *row++ = tmp | ((uint32_t) zstencil & ~dst_mask);
 587                   }
 588                   dst_map += dst_stride;
 589                }
 590             }
 591             break;
 592          case 8:
 593             if (!need_rmw) {
 594                for (i = 0; i < height; i++) {
 595                   uint64_t *row = (uint64_t *)dst_map;
 596                   for (j = 0; j < width; j++)
 597                      *row++ = zstencil;
 598                   dst_map += dst_stride;
 599                }
 600             }
 601             else {
 602                uint64_t src_mask;
 603
 604                if (clear_flags & PIPE_CLEAR_DEPTH)
 605                   src_mask = 0x00000000ffffffffull;
 606                else
 607                   src_mask = 0x000000ff00000000ull;
 608
 609                for (i = 0; i < height; i++) {
 610                   uint64_t *row = (uint64_t *)dst_map;
 611                   for (j = 0; j < width; j++) {
 612                      uint64_t tmp = *row & ~src_mask;
 613                      *row++ = tmp | (zstencil & src_mask);
 614                   }
 615                   dst_map += dst_stride;
 616                }
 617             }
 618             break;
 619          default:
 620             assert(0);
 621             break;
 622          }
 623          dst_layer += dst_trans->layer_stride;
 624       }
 625
 626       pipe->transfer_unmap(pipe, dst_trans);
 627    }
 628 }
 629
 630
 631 /* Return if the box is totally inside the resource.
 632  */
 633 static boolean
 634 is_box_inside_resource(const struct pipe_resource *res,
 635                        const struct pipe_box *box,
 636                        unsigned level)
 637 {
 638    unsigned width = 1, height = 1, depth = 1;
 639
 640    switch (res->target) {
 641    case PIPE_BUFFER:
 642       width = res->width0;
 643       height = 1;
 644       depth = 1;
 645       break;
 646    case PIPE_TEXTURE_1D:
 647       width = u_minify(res->width0, level);
 648       height = 1;
 649       depth = 1;
 650       break;
 651    case PIPE_TEXTURE_2D:
 652    case PIPE_TEXTURE_RECT:
 653       width = u_minify(res->width0, level);
 654       height = u_minify(res->height0, level);
 655       depth = 1;
 656       break;
 657    case PIPE_TEXTURE_3D:
 658       width = u_minify(res->width0, level);
 659       height = u_minify(res->height0, level);
 660       depth = u_minify(res->depth0, level);
 661       break;
 662    case PIPE_TEXTURE_CUBE:
 663       width = u_minify(res->width0, level);
 664       height = u_minify(res->height0, level);
 665       depth = 6;
 666       break;
 667    case PIPE_TEXTURE_1D_ARRAY:
 668       width = u_minify(res->width0, level);
 669       height = 1;
 670       depth = res->array_size;
 671       break;
 672    case PIPE_TEXTURE_2D_ARRAY:
 673       width = u_minify(res->width0, level);
 674       height = u_minify(res->height0, level);
 675       depth = res->array_size;
 676       break;
 677    case PIPE_TEXTURE_CUBE_ARRAY:
 678       width = u_minify(res->width0, level);
 679       height = u_minify(res->height0, level);
 680       depth = res->array_size;
 681       assert(res->array_size % 6 == 0);
 682       break;
 683    case PIPE_MAX_TEXTURE_TYPES:
 684       break;
 685    }
 686
 687    return box->x >= 0 &&
 688           box->x + box->width <= (int) width &&
 689           box->y >= 0 &&
 690           box->y + box->height <= (int) height &&
 691           box->z >= 0 &&
 692           box->z + box->depth <= (int) depth;
 693 }
 694
 695 static unsigned
 696 get_sample_count(const struct pipe_resource *res)
 697 {
 698    return res->nr_samples ? res->nr_samples : 1;
 699 }
 700
 701 /**
 702  * Try to do a blit using resource_copy_region. The function calls
 703  * resource_copy_region if the blit description is compatible with it.
 704  *
 705  * It returns TRUE if the blit was done using resource_copy_region.
 706  *
 707  * It returns FALSE otherwise and the caller must fall back to a more generic
 708  * codepath for the blit operation. (e.g. by using u_blitter)
 709  */
 710 boolean
 711 util_try_blit_via_copy_region(struct pipe_context *ctx,
 712                               const struct pipe_blit_info *blit)
 713 {
 714    unsigned mask = util_format_get_mask(blit->dst.format);
 715
 716    /* No format conversions. */
 717    if (blit->src.resource->format != blit->src.format ||
 718        blit->dst.resource->format != blit->dst.format ||
 719        !util_is_format_compatible(
 720           util_format_description(blit->src.resource->format),
 721           util_format_description(blit->dst.resource->format))) {
 722       return FALSE;
 723    }
 724
 725    /* No masks, no filtering, no scissor. */
 726    if ((blit->mask & mask) != mask ||
 727        blit->filter != PIPE_TEX_FILTER_NEAREST ||
 728        blit->scissor_enable) {
 729       return FALSE;
 730    }
 731
 732    /* No flipping. */
 733    if (blit->src.box.width < 0 ||
 734        blit->src.box.height < 0 ||
 735        blit->src.box.depth < 0) {
 736       return FALSE;
 737    }
 738
 739    /* No scaling. */
 740    if (blit->src.box.width != blit->dst.box.width ||
 741        blit->src.box.height != blit->dst.box.height ||
 742        blit->src.box.depth != blit->dst.box.depth) {
 743       return FALSE;
 744    }
 745
 746    /* No out-of-bounds access. */
 747    if (!is_box_inside_resource(blit->src.resource, &blit->src.box,
 748                                blit->src.level) ||
 749        !is_box_inside_resource(blit->dst.resource, &blit->dst.box,
 750                                blit->dst.level)) {
 751       return FALSE;
 752    }
 753
 754    /* Sample counts must match. */
 755    if (get_sample_count(blit->src.resource) !=
 756        get_sample_count(blit->dst.resource)) {
 757       return FALSE;
 758    }
 759
 760    if (blit->alpha_blend)
 761       return FALSE;
 762
 763    ctx->resource_copy_region(ctx, blit->dst.resource, blit->dst.level,
 764                              blit->dst.box.x, blit->dst.box.y, blit->dst.box.z,
 765                              blit->src.resource, blit->src.level,
 766                              &blit->src.box);
 767    return TRUE;
 768 }