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/format/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 #include "util/u_memset.h"
  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 3D box from one place to another.
  62  * Position and sizes are in pixels.
  63  */
  64 void
  65 util_copy_box(ubyte * dst,
  66               enum pipe_format format,
  67               unsigned dst_stride, unsigned dst_slice_stride,
  68               unsigned dst_x, unsigned dst_y, unsigned dst_z,
  69               unsigned width, unsigned height, unsigned depth,
  70               const ubyte * src,
  71               int src_stride, unsigned src_slice_stride,
  72               unsigned src_x, unsigned src_y, unsigned src_z)
  73 {
  74    unsigned z;
  75    dst += dst_z * dst_slice_stride;
  76    src += src_z * src_slice_stride;
  77    for (z = 0; z < depth; ++z) {
  78       util_copy_rect(dst,
  79                      format,
  80                      dst_stride,
  81                      dst_x, dst_y,
  82                      width, height,
  83                      src,
  84                      src_stride,
  85                      src_x, src_y);
  86
  87       dst += dst_slice_stride;
  88       src += src_slice_stride;
  89    }
  90 }
  91
  92
  93 void
  94 util_fill_rect(ubyte * dst,
  95                enum pipe_format format,
  96                unsigned dst_stride,
  97                unsigned dst_x,
  98                unsigned dst_y,
  99                unsigned width,
 100                unsigned height,
 101                union util_color *uc)
 102 {
 103    const struct util_format_description *desc = util_format_description(format);
 104    unsigned i, j;
 105    unsigned width_size;
 106    int blocksize = desc->block.bits / 8;
 107    int blockwidth = desc->block.width;
 108    int blockheight = desc->block.height;
 109
 110    assert(blocksize > 0);
 111    assert(blockwidth > 0);
 112    assert(blockheight > 0);
 113
 114    dst_x /= blockwidth;
 115    dst_y /= blockheight;
 116    width = (width + blockwidth - 1)/blockwidth;
 117    height = (height + blockheight - 1)/blockheight;
 118
 119    dst += dst_x * blocksize;
 120    dst += dst_y * dst_stride;
 121    width_size = width * blocksize;
 122
 123    switch (blocksize) {
 124    case 1:
 125       if(dst_stride == width_size)
 126          memset(dst, uc->ub, height * width_size);
 127       else {
 128          for (i = 0; i < height; i++) {
 129             memset(dst, uc->ub, width_size);
 130             dst += dst_stride;
 131          }
 132       }
 133       break;
 134    case 2:
 135       for (i = 0; i < height; i++) {
 136          uint16_t *row = (uint16_t *)dst;
 137          for (j = 0; j < width; j++)
 138             *row++ = uc->us;
 139          dst += dst_stride;
 140       }
 141       break;
 142    case 4:
 143       for (i = 0; i < height; i++) {
 144          util_memset32(dst, uc->ui[0], width);
 145          dst += dst_stride;
 146       }
 147       break;
 148    default:
 149       for (i = 0; i < height; i++) {
 150          ubyte *row = dst;
 151          for (j = 0; j < width; j++) {
 152             memcpy(row, uc, blocksize);
 153             row += blocksize;
 154          }
 155          dst += dst_stride;
 156       }
 157       break;
 158    }
 159 }
 160
 161
 162 void
 163 util_fill_box(ubyte * dst,
 164               enum pipe_format format,
 165               unsigned stride,
 166               unsigned layer_stride,
 167               unsigned x,
 168               unsigned y,
 169               unsigned z,
 170               unsigned width,
 171               unsigned height,
 172               unsigned depth,
 173               union util_color *uc)
 174 {
 175    unsigned layer;
 176    dst += z * layer_stride;
 177    for (layer = z; layer < depth; layer++) {
 178       util_fill_rect(dst, format,
 179                      stride,
 180                      x, y, width, height, uc);
 181       dst += layer_stride;
 182    }
 183 }
 184
 185
 186 /**
 187  * Fallback function for pipe->resource_copy_region().
 188  * We support copying between different formats (including compressed/
 189  * uncompressed) if the bytes per block or pixel matches.  If copying
 190  * compressed -> uncompressed, the dst region is reduced by the block
 191  * width, height.  If copying uncompressed -> compressed, the dest region
 192  * is expanded by the block width, height.  See GL_ARB_copy_image.
 193  * Note: (X,Y)=(0,0) is always the upper-left corner.
 194  */
 195 void
 196 util_resource_copy_region(struct pipe_context *pipe,
 197                           struct pipe_resource *dst,
 198                           unsigned dst_level,
 199                           unsigned dst_x, unsigned dst_y, unsigned dst_z,
 200                           struct pipe_resource *src,
 201                           unsigned src_level,
 202                           const struct pipe_box *src_box_in)
 203 {
 204    struct pipe_transfer *src_trans, *dst_trans;
 205    uint8_t *dst_map;
 206    const uint8_t *src_map;
 207    enum pipe_format src_format;
 208    enum pipe_format dst_format;
 209    struct pipe_box src_box, dst_box;
 210    unsigned src_bs, dst_bs, src_bw, dst_bw, src_bh, dst_bh;
 211
 212    assert(src && dst);
 213    if (!src || !dst)
 214       return;
 215
 216    assert((src->target == PIPE_BUFFER && dst->target == PIPE_BUFFER) ||
 217           (src->target != PIPE_BUFFER && dst->target != PIPE_BUFFER));
 218
 219    src_format = src->format;
 220    dst_format = dst->format;
 221
 222    /* init src box */
 223    src_box = *src_box_in;
 224
 225    /* init dst box */
 226    dst_box.x = dst_x;
 227    dst_box.y = dst_y;
 228    dst_box.z = dst_z;
 229    dst_box.width  = src_box.width;
 230    dst_box.height = src_box.height;
 231    dst_box.depth  = src_box.depth;
 232
 233    src_bs = util_format_get_blocksize(src_format);
 234    src_bw = util_format_get_blockwidth(src_format);
 235    src_bh = util_format_get_blockheight(src_format);
 236    dst_bs = util_format_get_blocksize(dst_format);
 237    dst_bw = util_format_get_blockwidth(dst_format);
 238    dst_bh = util_format_get_blockheight(dst_format);
 239
 240    /* Note: all box positions and sizes are in pixels */
 241    if (src_bw > 1 && dst_bw == 1) {
 242       /* Copy from compressed to uncompressed.
 243        * Shrink dest box by the src block size.
 244        */
 245       dst_box.width /= src_bw;
 246       dst_box.height /= src_bh;
 247    }
 248    else if (src_bw == 1 && dst_bw > 1) {
 249       /* Copy from uncompressed to compressed.
 250        * Expand dest box by the dest block size.
 251        */
 252       dst_box.width *= dst_bw;
 253       dst_box.height *= dst_bh;
 254    }
 255    else {
 256       /* compressed -> compressed or uncompressed -> uncompressed copy */
 257       assert(src_bw == dst_bw);
 258       assert(src_bh == dst_bh);
 259    }
 260
 261    assert(src_bs == dst_bs);
 262    if (src_bs != dst_bs) {
 263       /* This can happen if we fail to do format checking before hand.
 264        * Don't crash below.
 265        */
 266       return;
 267    }
 268
 269    /* check that region boxes are block aligned */
 270    assert(src_box.x % src_bw == 0);
 271    assert(src_box.y % src_bh == 0);
 272    assert(dst_box.x % dst_bw == 0);
 273    assert(dst_box.y % dst_bh == 0);
 274
 275    /* check that region boxes are not out of bounds */
 276    assert(src_box.x + src_box.width <= (int)u_minify(src->width0, src_level));
 277    assert(src_box.y + src_box.height <= (int)u_minify(src->height0, src_level));
 278    assert(dst_box.x + dst_box.width <= (int)u_minify(dst->width0, dst_level));
 279    assert(dst_box.y + dst_box.height <= (int)u_minify(dst->height0, dst_level));
 280
 281    /* check that total number of src, dest bytes match */
 282    assert((src_box.width / src_bw) * (src_box.height / src_bh) * src_bs ==
 283           (dst_box.width / dst_bw) * (dst_box.height / dst_bh) * dst_bs);
 284
 285    src_map = pipe->transfer_map(pipe,
 286                                 src,
 287                                 src_level,
 288                                 PIPE_TRANSFER_READ,
 289                                 &src_box, &src_trans);
 290    assert(src_map);
 291    if (!src_map) {
 292       goto no_src_map;
 293    }
 294
 295    dst_map = pipe->transfer_map(pipe,
 296                                 dst,
 297                                 dst_level,
 298                                 PIPE_TRANSFER_WRITE |
 299                                 PIPE_TRANSFER_DISCARD_RANGE, &dst_box,
 300                                 &dst_trans);
 301    assert(dst_map);
 302    if (!dst_map) {
 303       goto no_dst_map;
 304    }
 305
 306    if (dst->target == PIPE_BUFFER && src->target == PIPE_BUFFER) {
 307       assert(src_box.height == 1);
 308       assert(src_box.depth == 1);
 309       memcpy(dst_map, src_map, src_box.width);
 310    } else {
 311       util_copy_box(dst_map,
 312                     src_format,
 313                     dst_trans->stride, dst_trans->layer_stride,
 314                     0, 0, 0,
 315                     src_box.width, src_box.height, src_box.depth,
 316                     src_map,
 317                     src_trans->stride, src_trans->layer_stride,
 318                     0, 0, 0);
 319    }
 320
 321    pipe->transfer_unmap(pipe, dst_trans);
 322 no_dst_map:
 323    pipe->transfer_unmap(pipe, src_trans);
 324 no_src_map:
 325    ;
 326 }
 327
 328 static void
 329 util_clear_color_texture_helper(struct pipe_transfer *dst_trans,
 330                                 ubyte *dst_map,
 331                                 enum pipe_format format,
 332                                 const union pipe_color_union *color,
 333                                 unsigned width, unsigned height, unsigned depth)
 334 {
 335    union util_color uc;
 336
 337    assert(dst_trans->stride > 0);
 338
 339    util_pack_color_union(format, &uc, color);
 340
 341    util_fill_box(dst_map, format,
 342                  dst_trans->stride, dst_trans->layer_stride,
 343                  0, 0, 0, width, height, depth, &uc);
 344 }
 345
 346 static void
 347 util_clear_color_texture(struct pipe_context *pipe,
 348                          struct pipe_resource *texture,
 349                          enum pipe_format format,
 350                          const union pipe_color_union *color,
 351                          unsigned level,
 352                          unsigned dstx, unsigned dsty, unsigned dstz,
 353                          unsigned width, unsigned height, unsigned depth)
 354 {
 355    struct pipe_transfer *dst_trans;
 356    ubyte *dst_map;
 357
 358    dst_map = pipe_transfer_map_3d(pipe,
 359                                   texture,
 360                                   level,
 361                                   PIPE_TRANSFER_WRITE,
 362                                   dstx, dsty, dstz,
 363                                   width, height, depth,
 364                                   &dst_trans);
 365    if (!dst_map)
 366       return;
 367
 368    if (dst_trans->stride > 0) {
 369       util_clear_color_texture_helper(dst_trans, dst_map, format, color,
 370                                       width, height, depth);
 371    }
 372    pipe->transfer_unmap(pipe, dst_trans);
 373 }
 374
 375
 376 #define UBYTE_TO_USHORT(B) ((B) | ((B) << 8))
 377
 378
 379 /**
 380  * Fallback for pipe->clear_render_target() function.
 381  * XXX this looks too hackish to be really useful.
 382  * cpp > 4 looks like a gross hack at best...
 383  * Plus can't use these transfer fallbacks when clearing
 384  * multisampled surfaces for instance.
 385  * Clears all bound layers.
 386  */
 387 void
 388 util_clear_render_target(struct pipe_context *pipe,
 389                          struct pipe_surface *dst,
 390                          const union pipe_color_union *color,
 391                          unsigned dstx, unsigned dsty,
 392                          unsigned width, unsigned height)
 393 {
 394    struct pipe_transfer *dst_trans;
 395    ubyte *dst_map;
 396
 397    assert(dst->texture);
 398    if (!dst->texture)
 399       return;
 400
 401    if (dst->texture->target == PIPE_BUFFER) {
 402       /*
 403        * The fill naturally works on the surface format, however
 404        * the transfer uses resource format which is just bytes for buffers.
 405        */
 406       unsigned dx, w;
 407       unsigned pixstride = util_format_get_blocksize(dst->format);
 408       dx = (dst->u.buf.first_element + dstx) * pixstride;
 409       w = width * pixstride;
 410       dst_map = pipe_transfer_map(pipe,
 411                                   dst->texture,
 412                                   0, 0,
 413                                   PIPE_TRANSFER_WRITE,
 414                                   dx, 0, w, 1,
 415                                   &dst_trans);
 416       if (dst_map) {
 417          util_clear_color_texture_helper(dst_trans, dst_map, dst->format,
 418                                          color, width, height, 1);
 419          pipe->transfer_unmap(pipe, dst_trans);
 420       }
 421    }
 422    else {
 423       unsigned depth = dst->u.tex.last_layer - dst->u.tex.first_layer + 1;
 424       util_clear_color_texture(pipe, dst->texture, dst->format, color,
 425                                dst->u.tex.level, dstx, dsty,
 426                                dst->u.tex.first_layer, width, height, depth);
 427    }
 428 }
 429
 430 static void
 431 util_fill_zs_rect(ubyte *dst_map,
 432                   enum pipe_format format,
 433                   bool need_rmw,
 434                   unsigned clear_flags,
 435                   unsigned dst_stride,
 436                   unsigned width,
 437                   unsigned height,
 438                   uint64_t zstencil)
 439 {
 440    unsigned i, j;
 441    switch (util_format_get_blocksize(format)) {
 442    case 1:
 443       assert(format == PIPE_FORMAT_S8_UINT);
 444       if(dst_stride == width)
 445          memset(dst_map, (uint8_t) zstencil, height * width);
 446       else {
 447          for (i = 0; i < height; i++) {
 448             memset(dst_map, (uint8_t) zstencil, width);
 449             dst_map += dst_stride;
 450          }
 451       }
 452       break;
 453    case 2:
 454       assert(format == PIPE_FORMAT_Z16_UNORM);
 455       for (i = 0; i < height; i++) {
 456          uint16_t *row = (uint16_t *)dst_map;
 457          for (j = 0; j < width; j++)
 458             *row++ = (uint16_t) zstencil;
 459          dst_map += dst_stride;
 460       }
 461       break;
 462    case 4:
 463       if (!need_rmw) {
 464          for (i = 0; i < height; i++) {
 465             util_memset32(dst_map, (uint32_t)zstencil, width);
 466             dst_map += dst_stride;
 467          }
 468       }
 469       else {
 470          uint32_t dst_mask;
 471          if (format == PIPE_FORMAT_Z24_UNORM_S8_UINT)
 472             dst_mask = 0x00ffffff;
 473          else {
 474             assert(format == PIPE_FORMAT_S8_UINT_Z24_UNORM);
 475             dst_mask = 0xffffff00;
 476          }
 477          if (clear_flags & PIPE_CLEAR_DEPTH)
 478             dst_mask = ~dst_mask;
 479          for (i = 0; i < height; i++) {
 480             uint32_t *row = (uint32_t *)dst_map;
 481             for (j = 0; j < width; j++) {
 482                uint32_t tmp = *row & dst_mask;
 483                *row++ = tmp | ((uint32_t) zstencil & ~dst_mask);
 484             }
 485             dst_map += dst_stride;
 486          }
 487       }
 488       break;
 489    case 8:
 490       if (!need_rmw) {
 491          for (i = 0; i < height; i++) {
 492             uint64_t *row = (uint64_t *)dst_map;
 493             for (j = 0; j < width; j++)
 494                *row++ = zstencil;
 495             dst_map += dst_stride;
 496          }
 497       }
 498       else {
 499          uint64_t src_mask;
 500
 501          if (clear_flags & PIPE_CLEAR_DEPTH)
 502             src_mask = 0x00000000ffffffffull;
 503          else
 504             src_mask = 0x000000ff00000000ull;
 505
 506          for (i = 0; i < height; i++) {
 507             uint64_t *row = (uint64_t *)dst_map;
 508             for (j = 0; j < width; j++) {
 509                uint64_t tmp = *row & ~src_mask;
 510                *row++ = tmp | (zstencil & src_mask);
 511             }
 512             dst_map += dst_stride;
 513          }
 514       }
 515       break;
 516    default:
 517       assert(0);
 518       break;
 519    }
 520 }
 521
 522 void
 523 util_fill_zs_box(ubyte *dst,
 524                  enum pipe_format format,
 525                  bool need_rmw,
 526                  unsigned clear_flags,
 527                  unsigned stride,
 528                  unsigned layer_stride,
 529                  unsigned width,
 530                  unsigned height,
 531                  unsigned depth,
 532                  uint64_t zstencil)
 533 {
 534    unsigned layer;
 535
 536    for (layer = 0; layer < depth; layer++) {
 537       util_fill_zs_rect(dst, format, need_rmw, clear_flags, stride,
 538                         width, height, zstencil);
 539       dst += layer_stride;
 540    }
 541 }
 542
 543 static void
 544 util_clear_depth_stencil_texture(struct pipe_context *pipe,
 545                                  struct pipe_resource *texture,
 546                                  enum pipe_format format,
 547                                  unsigned clear_flags,
 548                                  uint64_t zstencil, unsigned level,
 549                                  unsigned dstx, unsigned dsty, unsigned dstz,
 550                                  unsigned width, unsigned height, unsigned depth)
 551 {
 552    struct pipe_transfer *dst_trans;
 553    ubyte *dst_map;
 554    boolean need_rmw = FALSE;
 555
 556    if ((clear_flags & PIPE_CLEAR_DEPTHSTENCIL) &&
 557        ((clear_flags & PIPE_CLEAR_DEPTHSTENCIL) != PIPE_CLEAR_DEPTHSTENCIL) &&
 558        util_format_is_depth_and_stencil(format))
 559       need_rmw = TRUE;
 560
 561    dst_map = pipe_transfer_map_3d(pipe,
 562                                   texture,
 563                                   level,
 564                                   (need_rmw ? PIPE_TRANSFER_READ_WRITE :
 565                                               PIPE_TRANSFER_WRITE),
 566                                   dstx, dsty, dstz,
 567                                   width, height, depth, &dst_trans);
 568    assert(dst_map);
 569    if (!dst_map)
 570       return;
 571
 572    assert(dst_trans->stride > 0);
 573
 574    util_fill_zs_box(dst_map, format, need_rmw, clear_flags,
 575                     dst_trans->stride,
 576                     dst_trans->layer_stride, width, height,
 577                     depth, zstencil);
 578
 579    pipe->transfer_unmap(pipe, dst_trans);
 580 }
 581
 582
 583 void
 584 util_clear_texture(struct pipe_context *pipe,
 585                    struct pipe_resource *tex,
 586                    unsigned level,
 587                    const struct pipe_box *box,
 588                    const void *data)
 589 {
 590    const struct util_format_description *desc =
 591           util_format_description(tex->format);
 592
 593    if (level > tex->last_level)
 594       return;
 595
 596    if (util_format_is_depth_or_stencil(tex->format)) {
 597       unsigned clear = 0;
 598       float depth = 0.0f;
 599       uint8_t stencil = 0;
 600       uint64_t zstencil;
 601
 602       if (util_format_has_depth(desc)) {
 603          clear |= PIPE_CLEAR_DEPTH;
 604          util_format_unpack_z_float(tex->format, &depth, data, 1);
 605       }
 606
 607       if (util_format_has_stencil(desc)) {
 608          clear |= PIPE_CLEAR_STENCIL;
 609          util_format_unpack_s_8uint(tex->format, &stencil, data, 1);
 610       }
 611
 612       zstencil = util_pack64_z_stencil(tex->format, depth, stencil);
 613
 614       util_clear_depth_stencil_texture(pipe, tex, tex->format, clear, zstencil,
 615                                        level, box->x, box->y, box->z,
 616                                        box->width, box->height, box->depth);
 617    } else {
 618       union pipe_color_union color;
 619       util_format_unpack_rgba(tex->format, color.ui, data, 1);
 620
 621       util_clear_color_texture(pipe, tex, tex->format, &color, level,
 622                                box->x, box->y, box->z,
 623                                box->width, box->height, box->depth);
 624    }
 625 }
 626
 627
 628 /**
 629  * Fallback for pipe->clear_stencil() function.
 630  * sw fallback doesn't look terribly useful here.
 631  * Plus can't use these transfer fallbacks when clearing
 632  * multisampled surfaces for instance.
 633  * Clears all bound layers.
 634  */
 635 void
 636 util_clear_depth_stencil(struct pipe_context *pipe,
 637                          struct pipe_surface *dst,
 638                          unsigned clear_flags,
 639                          double depth,
 640                          unsigned stencil,
 641                          unsigned dstx, unsigned dsty,
 642                          unsigned width, unsigned height)
 643 {
 644    uint64_t zstencil;
 645    unsigned max_layer;
 646
 647    assert(dst->texture);
 648    if (!dst->texture)
 649       return;
 650
 651    zstencil = util_pack64_z_stencil(dst->format, depth, stencil);
 652    max_layer = dst->u.tex.last_layer - dst->u.tex.first_layer;
 653    util_clear_depth_stencil_texture(pipe, dst->texture, dst->format,
 654                                     clear_flags, zstencil, dst->u.tex.level,
 655                                     dstx, dsty, dst->u.tex.first_layer,
 656                                     width, height, max_layer + 1);
 657 }
 658
 659
 660 /* Return if the box is totally inside the resource.
 661  */
 662 static boolean
 663 is_box_inside_resource(const struct pipe_resource *res,
 664                        const struct pipe_box *box,
 665                        unsigned level)
 666 {
 667    unsigned width = 1, height = 1, depth = 1;
 668
 669    switch (res->target) {
 670    case PIPE_BUFFER:
 671       width = res->width0;
 672       height = 1;
 673       depth = 1;
 674       break;
 675    case PIPE_TEXTURE_1D:
 676       width = u_minify(res->width0, level);
 677       height = 1;
 678       depth = 1;
 679       break;
 680    case PIPE_TEXTURE_2D:
 681    case PIPE_TEXTURE_RECT:
 682       width = u_minify(res->width0, level);
 683       height = u_minify(res->height0, level);
 684       depth = 1;
 685       break;
 686    case PIPE_TEXTURE_3D:
 687       width = u_minify(res->width0, level);
 688       height = u_minify(res->height0, level);
 689       depth = u_minify(res->depth0, level);
 690       break;
 691    case PIPE_TEXTURE_CUBE:
 692       width = u_minify(res->width0, level);
 693       height = u_minify(res->height0, level);
 694       depth = 6;
 695       break;
 696    case PIPE_TEXTURE_1D_ARRAY:
 697       width = u_minify(res->width0, level);
 698       height = 1;
 699       depth = res->array_size;
 700       break;
 701    case PIPE_TEXTURE_2D_ARRAY:
 702       width = u_minify(res->width0, level);
 703       height = u_minify(res->height0, level);
 704       depth = res->array_size;
 705       break;
 706    case PIPE_TEXTURE_CUBE_ARRAY:
 707       width = u_minify(res->width0, level);
 708       height = u_minify(res->height0, level);
 709       depth = res->array_size;
 710       assert(res->array_size % 6 == 0);
 711       break;
 712    case PIPE_MAX_TEXTURE_TYPES:
 713       break;
 714    }
 715
 716    return box->x >= 0 &&
 717           box->x + box->width <= (int) width &&
 718           box->y >= 0 &&
 719           box->y + box->height <= (int) height &&
 720           box->z >= 0 &&
 721           box->z + box->depth <= (int) depth;
 722 }
 723
 724 static unsigned
 725 get_sample_count(const struct pipe_resource *res)
 726 {
 727    return res->nr_samples ? res->nr_samples : 1;
 728 }
 729
 730
 731 /**
 732  * Check if a blit() command can be implemented with a resource_copy_region().
 733  * If tight_format_check is true, only allow the resource_copy_region() if
 734  * the blit src/dst formats are identical, ignoring the resource formats.
 735  * Otherwise, check for format casting and compatibility.
 736  */
 737 boolean
 738 util_can_blit_via_copy_region(const struct pipe_blit_info *blit,
 739                               boolean tight_format_check)
 740 {
 741    const struct util_format_description *src_desc, *dst_desc;
 742
 743    src_desc = util_format_description(blit->src.resource->format);
 744    dst_desc = util_format_description(blit->dst.resource->format);
 745
 746    if (tight_format_check) {
 747       /* no format conversions allowed */
 748       if (blit->src.format != blit->dst.format) {
 749          return FALSE;
 750       }
 751    }
 752    else {
 753       /* do loose format compatibility checking */
 754       if (blit->src.resource->format != blit->src.format ||
 755           blit->dst.resource->format != blit->dst.format ||
 756           !util_is_format_compatible(src_desc, dst_desc)) {
 757          return FALSE;
 758       }
 759    }
 760
 761    unsigned mask = util_format_get_mask(blit->dst.format);
 762
 763    /* No masks, no filtering, no scissor, no blending */
 764    if ((blit->mask & mask) != mask ||
 765        blit->filter != PIPE_TEX_FILTER_NEAREST ||
 766        blit->scissor_enable ||
 767        blit->num_window_rectangles > 0 ||
 768        blit->alpha_blend) {
 769       return FALSE;
 770    }
 771
 772    /* Only the src box can have negative dims for flipping */
 773    assert(blit->dst.box.width >= 1);
 774    assert(blit->dst.box.height >= 1);
 775    assert(blit->dst.box.depth >= 1);
 776
 777    /* No scaling or flipping */
 778    if (blit->src.box.width != blit->dst.box.width ||
 779        blit->src.box.height != blit->dst.box.height ||
 780        blit->src.box.depth != blit->dst.box.depth) {
 781       return FALSE;
 782    }
 783
 784    /* No out-of-bounds access. */
 785    if (!is_box_inside_resource(blit->src.resource, &blit->src.box,
 786                                blit->src.level) ||
 787        !is_box_inside_resource(blit->dst.resource, &blit->dst.box,
 788                                blit->dst.level)) {
 789       return FALSE;
 790    }
 791
 792    /* Sample counts must match. */
 793    if (get_sample_count(blit->src.resource) !=
 794        get_sample_count(blit->dst.resource)) {
 795       return FALSE;
 796    }
 797
 798    return TRUE;
 799 }
 800
 801
 802 /**
 803  * Try to do a blit using resource_copy_region. The function calls
 804  * resource_copy_region if the blit description is compatible with it.
 805  *
 806  * It returns TRUE if the blit was done using resource_copy_region.
 807  *
 808  * It returns FALSE otherwise and the caller must fall back to a more generic
 809  * codepath for the blit operation. (e.g. by using u_blitter)
 810  */
 811 boolean
 812 util_try_blit_via_copy_region(struct pipe_context *ctx,
 813                               const struct pipe_blit_info *blit)
 814 {
 815    if (util_can_blit_via_copy_region(blit, FALSE)) {
 816       ctx->resource_copy_region(ctx, blit->dst.resource, blit->dst.level,
 817                                 blit->dst.box.x, blit->dst.box.y,
 818                                 blit->dst.box.z,
 819                                 blit->src.resource, blit->src.level,
 820                                 &blit->src.box);
 821       return TRUE;
 822    }
 823    else {
 824       return FALSE;
 825    }
 826 }