src/mesa/drivers/dri/i965/intel_tex_image.c

   1
   2 #include "main/macros.h"
   3 #include "main/mtypes.h"
   4 #include "main/enums.h"
   5 #include "main/bufferobj.h"
   6 #include "main/context.h"
   7 #include "main/formats.h"
   8 #include "main/glformats.h"
   9 #include "main/image.h"
  10 #include "main/pbo.h"
  11 #include "main/renderbuffer.h"
  12 #include "main/texcompress.h"
  13 #include "main/texgetimage.h"
  14 #include "main/texobj.h"
  15 #include "main/teximage.h"
  16 #include "main/texstore.h"
  17
  18 #include "drivers/common/meta.h"
  19
  20 #include "intel_mipmap_tree.h"
  21 #include "intel_buffer_objects.h"
  22 #include "intel_batchbuffer.h"
  23 #include "intel_tex.h"
  24 #include "intel_blit.h"
  25 #include "intel_fbo.h"
  26 #include "intel_image.h"
  27 #include "intel_tiled_memcpy.h"
  28 #include "brw_context.h"
  29
  30 #define FILE_DEBUG_FLAG DEBUG_TEXTURE
  31
  32 /* Work back from the specified level of the image to the baselevel and create a
  33  * miptree of that size.
  34  */
  35 struct intel_mipmap_tree *
  36 intel_miptree_create_for_teximage(struct brw_context *brw,
  37                                   struct intel_texture_object *intelObj,
  38                                   struct intel_texture_image *intelImage,
  39                                   uint32_t layout_flags)
  40 {
  41    GLuint lastLevel;
  42    int width, height, depth;
  43
  44    intel_get_image_dims(&intelImage->base.Base, &width, &height, &depth);
  45
  46    DBG("%s\n", __func__);
  47
  48    /* Figure out image dimensions at start level. */
  49    switch(intelObj->base.Target) {
  50    case GL_TEXTURE_2D_MULTISAMPLE:
  51    case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
  52    case GL_TEXTURE_RECTANGLE:
  53    case GL_TEXTURE_EXTERNAL_OES:
  54       assert(intelImage->base.Base.Level == 0);
  55       break;
  56    case GL_TEXTURE_3D:
  57       depth <<= intelImage->base.Base.Level;
  58       /* Fall through */
  59    case GL_TEXTURE_2D:
  60    case GL_TEXTURE_2D_ARRAY:
  61    case GL_TEXTURE_CUBE_MAP:
  62    case GL_TEXTURE_CUBE_MAP_ARRAY:
  63       height <<= intelImage->base.Base.Level;
  64       /* Fall through */
  65    case GL_TEXTURE_1D:
  66    case GL_TEXTURE_1D_ARRAY:
  67       width <<= intelImage->base.Base.Level;
  68       break;
  69    default:
  70       unreachable("Unexpected target");
  71    }
  72
  73    /* Guess a reasonable value for lastLevel.  This is probably going
  74     * to be wrong fairly often and might mean that we have to look at
  75     * resizable buffers, or require that buffers implement lazy
  76     * pagetable arrangements.
  77     */
  78    if ((intelObj->base.Sampler.MinFilter == GL_NEAREST ||
  79         intelObj->base.Sampler.MinFilter == GL_LINEAR) &&
  80        intelImage->base.Base.Level == 0 &&
  81        !intelObj->base.GenerateMipmap) {
  82       lastLevel = 0;
  83    } else {
  84       lastLevel = _mesa_get_tex_max_num_levels(intelObj->base.Target,
  85                                                width, height, depth) - 1;
  86    }
  87
  88    return intel_miptree_create(brw,
  89                                intelObj->base.Target,
  90                                intelImage->base.Base.TexFormat,
  91                                0,
  92                                lastLevel,
  93                                width,
  94                                height,
  95                                depth,
  96                                intelImage->base.Base.NumSamples,
  97                                layout_flags | MIPTREE_LAYOUT_TILING_ANY);
  98 }
  99
 100 static void
 101 intelTexImage(struct gl_context * ctx,
 102               GLuint dims,
 103               struct gl_texture_image *texImage,
 104               GLenum format, GLenum type, const void *pixels,
 105               const struct gl_pixelstore_attrib *unpack)
 106 {
 107    struct intel_texture_image *intelImage = intel_texture_image(texImage);
 108    bool ok;
 109
 110    bool tex_busy = intelImage->mt && drm_intel_bo_busy(intelImage->mt->bo);
 111
 112    DBG("%s mesa_format %s target %s format %s type %s level %d %dx%dx%d\n",
 113        __func__, _mesa_get_format_name(texImage->TexFormat),
 114        _mesa_enum_to_string(texImage->TexObject->Target),
 115        _mesa_enum_to_string(format), _mesa_enum_to_string(type),
 116        texImage->Level, texImage->Width, texImage->Height, texImage->Depth);
 117
 118    /* Allocate storage for texture data. */
 119    if (!ctx->Driver.AllocTextureImageBuffer(ctx, texImage)) {
 120       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glTexImage%uD", dims);
 121       return;
 122    }
 123
 124    assert(intelImage->mt);
 125
 126    if (intelImage->mt->format == MESA_FORMAT_S_UINT8)
 127       intelImage->mt->r8stencil_needs_update = true;
 128
 129    ok = _mesa_meta_pbo_TexSubImage(ctx, dims, texImage, 0, 0, 0,
 130                                    texImage->Width, texImage->Height,
 131                                    texImage->Depth,
 132                                    format, type, pixels,
 133                                    tex_busy, unpack);
 134    if (ok)
 135       return;
 136
 137    ok = intel_texsubimage_tiled_memcpy(ctx, dims, texImage,
 138                                        0, 0, 0, /*x,y,z offsets*/
 139                                        texImage->Width,
 140                                        texImage->Height,
 141                                        texImage->Depth,
 142                                        format, type, pixels, unpack,
 143                                        false /*allocate_storage*/);
 144    if (ok)
 145       return;
 146
 147    DBG("%s: upload image %dx%dx%d pixels %p\n",
 148        __func__, texImage->Width, texImage->Height, texImage->Depth,
 149        pixels);
 150
 151    _mesa_store_teximage(ctx, dims, texImage,
 152                         format, type, pixels, unpack);
 153 }
 154
 155
 156 static void
 157 intel_set_texture_image_mt(struct brw_context *brw,
 158                            struct gl_texture_image *image,
 159                            GLenum internal_format,
 160                            struct intel_mipmap_tree *mt)
 161
 162 {
 163    struct gl_texture_object *texobj = image->TexObject;
 164    struct intel_texture_object *intel_texobj = intel_texture_object(texobj);
 165    struct intel_texture_image *intel_image = intel_texture_image(image);
 166
 167    _mesa_init_teximage_fields(&brw->ctx, image,
 168                               mt->logical_width0, mt->logical_height0, 1,
 169                               0, internal_format, mt->format);
 170
 171    brw->ctx.Driver.FreeTextureImageBuffer(&brw->ctx, image);
 172
 173    intel_texobj->needs_validate = true;
 174    intel_image->base.RowStride = mt->pitch / mt->cpp;
 175    assert(mt->pitch % mt->cpp == 0);
 176
 177    intel_miptree_reference(&intel_image->mt, mt);
 178
 179    /* Immediately validate the image to the object. */
 180    intel_miptree_reference(&intel_texobj->mt, mt);
 181 }
 182
 183 static struct intel_mipmap_tree *
 184 create_mt_for_planar_dri_image(struct brw_context *brw,
 185                                GLenum target, __DRIimage *image)
 186 {
 187    struct intel_image_format *f = image->planar_format;
 188    struct intel_mipmap_tree *planar_mt;
 189
 190    for (int i = 0; i < f->nplanes; i++) {
 191       const int index = f->planes[i].buffer_index;
 192       const uint32_t dri_format = f->planes[i].dri_format;
 193       const mesa_format format = driImageFormatToGLFormat(dri_format);
 194       const uint32_t width = image->width >> f->planes[i].width_shift;
 195       const uint32_t height = image->height >> f->planes[i].height_shift;
 196
 197       /* Disable creation of the texture's aux buffers because the driver
 198        * exposes no EGL API to manage them. That is, there is no API for
 199        * resolving the aux buffer's content to the main buffer nor for
 200        * invalidating the aux buffer's content.
 201        */
 202       struct intel_mipmap_tree *mt =
 203          intel_miptree_create_for_bo(brw, image->bo, format,
 204                                      image->offsets[index],
 205                                      width, height, 1,
 206                                      image->strides[index],
 207                                      MIPTREE_LAYOUT_DISABLE_AUX);
 208       if (mt == NULL)
 209          return NULL;
 210
 211       mt->target = target;
 212       mt->total_width = width;
 213       mt->total_height = height;
 214
 215       if (i == 0)
 216          planar_mt = mt;
 217       else
 218          planar_mt->plane[i - 1] = mt;
 219    }
 220
 221    return planar_mt;
 222 }
 223
 224 /**
 225  * Binds a BO to a texture image, as if it was uploaded by glTexImage2D().
 226  *
 227  * Used for GLX_EXT_texture_from_pixmap and EGL image extensions,
 228  */
 229 static struct intel_mipmap_tree *
 230 create_mt_for_dri_image(struct brw_context *brw,
 231                         GLenum target, __DRIimage *image)
 232 {
 233    struct intel_mipmap_tree *mt;
 234    uint32_t draw_x, draw_y;
 235
 236    /* Disable creation of the texture's aux buffers because the driver exposes
 237     * no EGL API to manage them. That is, there is no API for resolving the aux
 238     * buffer's content to the main buffer nor for invalidating the aux buffer's
 239     * content.
 240     */
 241    mt = intel_miptree_create_for_bo(brw, image->bo, image->format,
 242                                     0, image->width, image->height, 1,
 243                                     image->pitch,
 244                                     MIPTREE_LAYOUT_DISABLE_AUX);
 245    if (mt == NULL)
 246       return NULL;
 247
 248    mt->target = target;
 249    mt->total_width = image->width;
 250    mt->total_height = image->height;
 251    mt->level[0].slice[0].x_offset = image->tile_x;
 252    mt->level[0].slice[0].y_offset = image->tile_y;
 253
 254    intel_miptree_get_tile_offsets(mt, 0, 0, &draw_x, &draw_y);
 255
 256    /* From "OES_EGL_image" error reporting. We report GL_INVALID_OPERATION
 257     * for EGL images from non-tile aligned sufaces in gen4 hw and earlier which has
 258     * trouble resolving back to destination image due to alignment issues.
 259     */
 260    if (!brw->has_surface_tile_offset &&
 261        (draw_x != 0 || draw_y != 0)) {
 262       _mesa_error(&brw->ctx, GL_INVALID_OPERATION, __func__);
 263       intel_miptree_release(&mt);
 264       return NULL;
 265    }
 266
 267    mt->offset = image->offset;
 268
 269    return mt;
 270 }
 271
 272 void
 273 intelSetTexBuffer2(__DRIcontext *pDRICtx, GLint target,
 274                    GLint texture_format,
 275                    __DRIdrawable *dPriv)
 276 {
 277    struct gl_framebuffer *fb = dPriv->driverPrivate;
 278    struct brw_context *brw = pDRICtx->driverPrivate;
 279    struct gl_context *ctx = &brw->ctx;
 280    struct intel_renderbuffer *rb;
 281    struct gl_texture_object *texObj;
 282    struct gl_texture_image *texImage;
 283    mesa_format texFormat = MESA_FORMAT_NONE;
 284    struct intel_mipmap_tree *mt;
 285    GLenum internal_format = 0;
 286
 287    texObj = _mesa_get_current_tex_object(ctx, target);
 288
 289    if (!texObj)
 290       return;
 291
 292    if (dPriv->lastStamp != dPriv->dri2.stamp ||
 293        !pDRICtx->driScreenPriv->dri2.useInvalidate)
 294       intel_update_renderbuffers(pDRICtx, dPriv);
 295
 296    rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 297    /* If the miptree isn't set, then intel_update_renderbuffers was unable
 298     * to get the BO for the drawable from the window system.
 299     */
 300    if (!rb || !rb->mt)
 301       return;
 302
 303    if (rb->mt->cpp == 4) {
 304       if (texture_format == __DRI_TEXTURE_FORMAT_RGB) {
 305          internal_format = GL_RGB;
 306          texFormat = MESA_FORMAT_B8G8R8X8_UNORM;
 307       }
 308       else {
 309          internal_format = GL_RGBA;
 310          texFormat = MESA_FORMAT_B8G8R8A8_UNORM;
 311       }
 312    } else if (rb->mt->cpp == 2) {
 313       internal_format = GL_RGB;
 314       texFormat = MESA_FORMAT_B5G6R5_UNORM;
 315    }
 316
 317    intel_miptree_make_shareable(brw, rb->mt);
 318    mt = intel_miptree_create_for_bo(brw, rb->mt->bo, texFormat, 0,
 319                                     rb->Base.Base.Width,
 320                                     rb->Base.Base.Height,
 321                                     1, rb->mt->pitch, 0);
 322    if (mt == NULL)
 323        return;
 324    mt->target = target;
 325    mt->total_width = rb->Base.Base.Width;
 326    mt->total_height = rb->Base.Base.Height;
 327
 328    _mesa_lock_texture(&brw->ctx, texObj);
 329    texImage = _mesa_get_tex_image(ctx, texObj, target, 0);
 330    intel_set_texture_image_mt(brw, texImage, internal_format, mt);
 331    intel_miptree_release(&mt);
 332    _mesa_unlock_texture(&brw->ctx, texObj);
 333 }
 334
 335 static GLboolean
 336 intel_bind_renderbuffer_tex_image(struct gl_context *ctx,
 337                                   struct gl_renderbuffer *rb,
 338                                   struct gl_texture_image *image)
 339 {
 340    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 341    struct intel_texture_image *intel_image = intel_texture_image(image);
 342    struct gl_texture_object *texobj = image->TexObject;
 343    struct intel_texture_object *intel_texobj = intel_texture_object(texobj);
 344
 345    /* We can only handle RB allocated with AllocRenderbufferStorage, or
 346     * window-system renderbuffers.
 347     */
 348    assert(!rb->TexImage);
 349
 350    if (!irb->mt)
 351       return false;
 352
 353    _mesa_lock_texture(ctx, texobj);
 354    _mesa_init_teximage_fields(ctx, image,
 355                               rb->Width, rb->Height, 1,
 356                               0, rb->InternalFormat, rb->Format);
 357    image->NumSamples = rb->NumSamples;
 358
 359    intel_miptree_reference(&intel_image->mt, irb->mt);
 360
 361    /* Immediately validate the image to the object. */
 362    intel_miptree_reference(&intel_texobj->mt, intel_image->mt);
 363
 364    intel_texobj->needs_validate = true;
 365    _mesa_unlock_texture(ctx, texobj);
 366
 367    return true;
 368 }
 369
 370 void
 371 intelSetTexBuffer(__DRIcontext *pDRICtx, GLint target, __DRIdrawable *dPriv)
 372 {
 373    /* The old interface didn't have the format argument, so copy our
 374     * implementation's behavior at the time.
 375     */
 376    intelSetTexBuffer2(pDRICtx, target, __DRI_TEXTURE_FORMAT_RGBA, dPriv);
 377 }
 378
 379 static void
 380 intel_image_target_texture_2d(struct gl_context *ctx, GLenum target,
 381                               struct gl_texture_object *texObj,
 382                               struct gl_texture_image *texImage,
 383                               GLeglImageOES image_handle)
 384 {
 385    struct brw_context *brw = brw_context(ctx);
 386    struct intel_mipmap_tree *mt;
 387    __DRIscreen *dri_screen = brw->screen->driScrnPriv;
 388    __DRIimage *image;
 389
 390    image = dri_screen->dri2.image->lookupEGLImage(dri_screen, image_handle,
 391                                                   dri_screen->loaderPrivate);
 392    if (image == NULL)
 393       return;
 394
 395    /* We support external textures only for EGLImages created with
 396     * EGL_EXT_image_dma_buf_import. We may lift that restriction in the future.
 397     */
 398    if (target == GL_TEXTURE_EXTERNAL_OES && !image->dma_buf_imported) {
 399       _mesa_error(ctx, GL_INVALID_OPERATION,
 400             "glEGLImageTargetTexture2DOES(external target is enabled only "
 401                "for images created with EGL_EXT_image_dma_buf_import");
 402       return;
 403    }
 404
 405    /* Disallow depth/stencil textures: we don't have a way to pass the
 406     * separate stencil miptree of a GL_DEPTH_STENCIL texture through.
 407     */
 408    if (image->has_depthstencil) {
 409       _mesa_error(ctx, GL_INVALID_OPERATION, __func__);
 410       return;
 411    }
 412
 413    if (image->planar_format && image->planar_format->nplanes > 0)
 414       mt = create_mt_for_planar_dri_image(brw, target, image);
 415    else
 416       mt = create_mt_for_dri_image(brw, target, image);
 417    if (mt == NULL)
 418       return;
 419
 420    struct intel_texture_object *intel_texobj = intel_texture_object(texObj);
 421    intel_texobj->planar_format = image->planar_format;
 422
 423    const GLenum internal_format =
 424       image->internal_format != 0 ?
 425       image->internal_format : _mesa_get_format_base_format(mt->format);
 426    intel_set_texture_image_mt(brw, texImage, internal_format, mt);
 427    intel_miptree_release(&mt);
 428 }
 429
 430 /**
 431  * \brief A fast path for glGetTexImage.
 432  *
 433  * \see intel_readpixels_tiled_memcpy()
 434  */
 435 bool
 436 intel_gettexsubimage_tiled_memcpy(struct gl_context *ctx,
 437                                   struct gl_texture_image *texImage,
 438                                   GLint xoffset, GLint yoffset,
 439                                   GLsizei width, GLsizei height,
 440                                   GLenum format, GLenum type,
 441                                   GLvoid *pixels,
 442                                   const struct gl_pixelstore_attrib *packing)
 443 {
 444    struct brw_context *brw = brw_context(ctx);
 445    struct intel_texture_image *image = intel_texture_image(texImage);
 446    int dst_pitch;
 447
 448    /* The miptree's buffer. */
 449    drm_intel_bo *bo;
 450
 451    int error = 0;
 452
 453    uint32_t cpp;
 454    mem_copy_fn mem_copy = NULL;
 455
 456    /* This fastpath is restricted to specific texture types:
 457     * a 2D BGRA, RGBA, L8 or A8 texture. It could be generalized to support
 458     * more types.
 459     *
 460     * FINISHME: The restrictions below on packing alignment and packing row
 461     * length are likely unneeded now because we calculate the destination stride
 462     * with _mesa_image_row_stride. However, before removing the restrictions
 463     * we need tests.
 464     */
 465    if (!brw->has_llc ||
 466        !(type == GL_UNSIGNED_BYTE || type == GL_UNSIGNED_INT_8_8_8_8_REV) ||
 467        !(texImage->TexObject->Target == GL_TEXTURE_2D ||
 468          texImage->TexObject->Target == GL_TEXTURE_RECTANGLE) ||
 469        pixels == NULL ||
 470        _mesa_is_bufferobj(packing->BufferObj) ||
 471        packing->Alignment > 4 ||
 472        packing->SkipPixels > 0 ||
 473        packing->SkipRows > 0 ||
 474        (packing->RowLength != 0 && packing->RowLength != width) ||
 475        packing->SwapBytes ||
 476        packing->LsbFirst ||
 477        packing->Invert)
 478       return false;
 479
 480    /* We can't handle copying from RGBX or BGRX because the tiled_memcpy
 481     * function doesn't set the last channel to 1. Note this checks BaseFormat
 482     * rather than TexFormat in case the RGBX format is being simulated with an
 483     * RGBA format.
 484     */
 485    if (texImage->_BaseFormat == GL_RGB)
 486       return false;
 487
 488    if (!intel_get_memcpy(texImage->TexFormat, format, type, &mem_copy, &cpp))
 489       return false;
 490
 491    /* If this is a nontrivial texture view, let another path handle it instead. */
 492    if (texImage->TexObject->MinLayer)
 493       return false;
 494
 495    if (!image->mt ||
 496        (image->mt->tiling != I915_TILING_X &&
 497        image->mt->tiling != I915_TILING_Y)) {
 498       /* The algorithm is written only for X- or Y-tiled memory. */
 499       return false;
 500    }
 501
 502    /* Since we are going to write raw data to the miptree, we need to resolve
 503     * any pending fast color clears before we start.
 504     */
 505    intel_miptree_resolve_color(brw, image->mt, 0);
 506
 507    bo = image->mt->bo;
 508
 509    if (drm_intel_bo_references(brw->batch.bo, bo)) {
 510       perf_debug("Flushing before mapping a referenced bo.\n");
 511       intel_batchbuffer_flush(brw);
 512    }
 513
 514    error = brw_bo_map(brw, bo, false /* write enable */, "miptree");
 515    if (error) {
 516       DBG("%s: failed to map bo\n", __func__);
 517       return false;
 518    }
 519
 520    dst_pitch = _mesa_image_row_stride(packing, width, format, type);
 521
 522    DBG("%s: level=%d x,y=(%d,%d) (w,h)=(%d,%d) format=0x%x type=0x%x "
 523        "mesa_format=0x%x tiling=%d "
 524        "packing=(alignment=%d row_length=%d skip_pixels=%d skip_rows=%d)\n",
 525        __func__, texImage->Level, xoffset, yoffset, width, height,
 526        format, type, texImage->TexFormat, image->mt->tiling,
 527        packing->Alignment, packing->RowLength, packing->SkipPixels,
 528        packing->SkipRows);
 529
 530    int level = texImage->Level + texImage->TexObject->MinLevel;
 531
 532    /* Adjust x and y offset based on miplevel */
 533    xoffset += image->mt->level[level].level_x;
 534    yoffset += image->mt->level[level].level_y;
 535
 536    tiled_to_linear(
 537       xoffset * cpp, (xoffset + width) * cpp,
 538       yoffset, yoffset + height,
 539       pixels - (ptrdiff_t) yoffset * dst_pitch - (ptrdiff_t) xoffset * cpp,
 540       bo->virtual,
 541       dst_pitch, image->mt->pitch,
 542       brw->has_swizzling,
 543       image->mt->tiling,
 544       mem_copy
 545    );
 546
 547    drm_intel_bo_unmap(bo);
 548    return true;
 549 }
 550
 551 static void
 552 intel_get_tex_sub_image(struct gl_context *ctx,
 553                         GLint xoffset, GLint yoffset, GLint zoffset,
 554                         GLsizei width, GLsizei height, GLint depth,
 555                         GLenum format, GLenum type, GLvoid *pixels,
 556                         struct gl_texture_image *texImage)
 557 {
 558    struct brw_context *brw = brw_context(ctx);
 559    bool ok;
 560
 561    DBG("%s\n", __func__);
 562
 563    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 564       if (_mesa_meta_pbo_GetTexSubImage(ctx, 3, texImage,
 565                                         xoffset, yoffset, zoffset,
 566                                         width, height, depth, format, type,
 567                                         pixels, &ctx->Pack)) {
 568          /* Flush to guarantee coherency between the render cache and other
 569           * caches the PBO could potentially be bound to after this point.
 570           * See the related comment in intelReadPixels() for a more detailed
 571           * explanation.
 572           */
 573          brw_emit_mi_flush(brw);
 574          return;
 575       }
 576
 577       perf_debug("%s: fallback to CPU mapping in PBO case\n", __func__);
 578    }
 579
 580    ok = intel_gettexsubimage_tiled_memcpy(ctx, texImage, xoffset, yoffset,
 581                                           width, height,
 582                                           format, type, pixels, &ctx->Pack);
 583
 584    if(ok)
 585       return;
 586
 587    _mesa_meta_GetTexSubImage(ctx, xoffset, yoffset, zoffset,
 588                              width, height, depth,
 589                              format, type, pixels, texImage);
 590
 591    DBG("%s - DONE\n", __func__);
 592 }
 593
 594 static void
 595 flush_astc_denorms(struct gl_context *ctx, GLuint dims,
 596                    struct gl_texture_image *texImage,
 597                    GLint xoffset, GLint yoffset, GLint zoffset,
 598                    GLsizei width, GLsizei height, GLsizei depth)
 599 {
 600    struct compressed_pixelstore store;
 601    _mesa_compute_compressed_pixelstore(dims, texImage->TexFormat,
 602                                        width, height, depth,
 603                                        &ctx->Unpack, &store);
 604
 605    for (int slice = 0; slice < store.CopySlices; slice++) {
 606
 607       /* Map dest texture buffer */
 608       GLubyte *dstMap;
 609       GLint dstRowStride;
 610       ctx->Driver.MapTextureImage(ctx, texImage, slice + zoffset,
 611                                   xoffset, yoffset, width, height,
 612                                   GL_MAP_READ_BIT | GL_MAP_WRITE_BIT,
 613                                   &dstMap, &dstRowStride);
 614       if (!dstMap)
 615          continue;
 616
 617       for (int i = 0; i < store.CopyRowsPerSlice; i++) {
 618
 619          /* An ASTC block is stored in little endian mode. The byte that
 620           * contains bits 0..7 is stored at the lower address in memory.
 621           */
 622          struct astc_void_extent {
 623             uint16_t header : 12;
 624             uint16_t dontcare[3];
 625             uint16_t R;
 626             uint16_t G;
 627             uint16_t B;
 628             uint16_t A;
 629          } *blocks = (struct astc_void_extent*) dstMap;
 630
 631          /* Iterate over every copied block in the row */
 632          for (int j = 0; j < store.CopyBytesPerRow / 16; j++) {
 633
 634             /* Check if the header matches that of an LDR void-extent block */
 635             if (blocks[j].header == 0xDFC) {
 636
 637                /* Flush UNORM16 values that would be denormalized */
 638                if (blocks[j].A < 4) blocks[j].A = 0;
 639                if (blocks[j].B < 4) blocks[j].B = 0;
 640                if (blocks[j].G < 4) blocks[j].G = 0;
 641                if (blocks[j].R < 4) blocks[j].R = 0;
 642             }
 643          }
 644
 645          dstMap += dstRowStride;
 646       }
 647
 648       ctx->Driver.UnmapTextureImage(ctx, texImage, slice + zoffset);
 649    }
 650 }
 651
 652
 653 static void
 654 intelCompressedTexSubImage(struct gl_context *ctx, GLuint dims,
 655                         struct gl_texture_image *texImage,
 656                         GLint xoffset, GLint yoffset, GLint zoffset,
 657                         GLsizei width, GLsizei height, GLsizei depth,
 658                         GLenum format,
 659                         GLsizei imageSize, const GLvoid *data)
 660 {
 661    /* Upload the compressed data blocks */
 662    _mesa_store_compressed_texsubimage(ctx, dims, texImage,
 663                                       xoffset, yoffset, zoffset,
 664                                       width, height, depth,
 665                                       format, imageSize, data);
 666
 667    /* Fix up copied ASTC blocks if necessary */
 668    GLenum gl_format = _mesa_compressed_format_to_glenum(ctx,
 669                                                         texImage->TexFormat);
 670    bool is_linear_astc = _mesa_is_astc_format(gl_format) &&
 671                         !_mesa_is_srgb_format(gl_format);
 672    struct brw_context *brw = (struct brw_context*) ctx;
 673    if (brw->gen == 9 && is_linear_astc)
 674       flush_astc_denorms(ctx, dims, texImage,
 675                          xoffset, yoffset, zoffset,
 676                          width, height, depth);
 677 }
 678
 679 void
 680 intelInitTextureImageFuncs(struct dd_function_table *functions)
 681 {
 682    functions->TexImage = intelTexImage;
 683    functions->CompressedTexSubImage = intelCompressedTexSubImage;
 684    functions->EGLImageTargetTexture2D = intel_image_target_texture_2d;
 685    functions->BindRenderbufferTexImage = intel_bind_renderbuffer_tex_image;
 686    functions->GetTexSubImage = intel_get_tex_sub_image;
 687 }