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

   1
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4
   5 #include "glheader.h"
   6 #include "macros.h"
   7 #include "mtypes.h"
   8 #include "enums.h"
   9 #include "colortab.h"
  10 #include "convolve.h"
  11 #include "context.h"
  12 #include "simple_list.h"
  13 #include "texcompress.h"
  14 #include "texformat.h"
  15 #include "texobj.h"
  16 #include "texstore.h"
  17
  18 #include "intel_context.h"
  19 #include "intel_mipmap_tree.h"
  20 #include "intel_buffer_objects.h"
  21 #include "intel_batchbuffer.h"
  22 #include "intel_tex.h"
  23 #include "intel_ioctl.h"
  24 #include "intel_blit.h"
  25
  26 #define FILE_DEBUG_FLAG DEBUG_TEXTURE
  27
  28 /* Functions to store texture images.  Where possible, mipmap_tree's
  29  * will be created or further instantiated with image data, otherwise
  30  * images will be stored in malloc'd memory.  A validation step is
  31  * required to pull those images into a mipmap tree, or otherwise
  32  * decide a fallback is required.
  33  */
  34
  35
  36 static int
  37 logbase2(int n)
  38 {
  39    GLint i = 1;
  40    GLint log2 = 0;
  41
  42    while (n > i) {
  43       i *= 2;
  44       log2++;
  45    }
  46
  47    return log2;
  48 }
  49
  50
  51 /* Otherwise, store it in memory if (Border != 0) or (any dimension ==
  52  * 1).
  53  *
  54  * Otherwise, if max_level >= level >= min_level, create tree with
  55  * space for textures from min_level down to max_level.
  56  *
  57  * Otherwise, create tree with space for textures from (level
  58  * 0)..(1x1).  Consider pruning this tree at a validation if the
  59  * saving is worth it.
  60  */
  61 static void
  62 guess_and_alloc_mipmap_tree(struct intel_context *intel,
  63                             struct intel_texture_object *intelObj,
  64                             struct intel_texture_image *intelImage)
  65 {
  66    GLuint firstLevel;
  67    GLuint lastLevel;
  68    GLuint width = intelImage->base.Width;
  69    GLuint height = intelImage->base.Height;
  70    GLuint depth = intelImage->base.Depth;
  71    GLuint l2width, l2height, l2depth;
  72    GLuint i, comp_byte = 0;
  73
  74    DBG("%s\n", __FUNCTION__);
  75
  76    if (intelImage->base.Border)
  77       return;
  78
  79    if (intelImage->level > intelObj->base.BaseLevel &&
  80        (intelImage->base.Width == 1 ||
  81         (intelObj->base.Target != GL_TEXTURE_1D &&
  82          intelImage->base.Height == 1) ||
  83         (intelObj->base.Target == GL_TEXTURE_3D &&
  84          intelImage->base.Depth == 1)))
  85       return;
  86
  87    /* If this image disrespects BaseLevel, allocate from level zero.
  88     * Usually BaseLevel == 0, so it's unlikely to happen.
  89     */
  90    if (intelImage->level < intelObj->base.BaseLevel)
  91       firstLevel = 0;
  92    else
  93       firstLevel = intelObj->base.BaseLevel;
  94
  95
  96    /* Figure out image dimensions at start level.
  97     */
  98    for (i = intelImage->level; i > firstLevel; i--) {
  99       width <<= 1;
 100       if (height != 1)
 101          height <<= 1;
 102       if (depth != 1)
 103          depth <<= 1;
 104    }
 105
 106    /* Guess a reasonable value for lastLevel.  This is probably going
 107     * to be wrong fairly often and might mean that we have to look at
 108     * resizable buffers, or require that buffers implement lazy
 109     * pagetable arrangements.
 110     */
 111    if ((intelObj->base.MinFilter == GL_NEAREST ||
 112         intelObj->base.MinFilter == GL_LINEAR) &&
 113        intelImage->level == firstLevel) {
 114       lastLevel = firstLevel;
 115    }
 116    else {
 117       l2width = logbase2(width);
 118       l2height = logbase2(height);
 119       l2depth = logbase2(depth);
 120       lastLevel = firstLevel + MAX2(MAX2(l2width, l2height), l2depth);
 121    }
 122
 123    assert(!intelObj->mt);
 124    if (intelImage->base.IsCompressed)
 125       comp_byte = intel_compressed_num_bytes(intelImage->base.TexFormat->MesaFormat);
 126    intelObj->mt = intel_miptree_create(intel,
 127                                        intelObj->base.Target,
 128                                        intelImage->base.InternalFormat,
 129                                        firstLevel,
 130                                        lastLevel,
 131                                        width,
 132                                        height,
 133                                        depth,
 134                                        intelImage->base.TexFormat->TexelBytes,
 135                                        comp_byte);
 136
 137    DBG("%s - success\n", __FUNCTION__);
 138 }
 139
 140
 141
 142
 143 static GLuint
 144 target_to_face(GLenum target)
 145 {
 146    switch (target) {
 147    case GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB:
 148    case GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB:
 149    case GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB:
 150    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB:
 151    case GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB:
 152    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB:
 153       return ((GLuint) target - (GLuint) GL_TEXTURE_CUBE_MAP_POSITIVE_X);
 154    default:
 155       return 0;
 156    }
 157 }
 158
 159 /* There are actually quite a few combinations this will work for,
 160  * more than what I've listed here.
 161  */
 162 static GLboolean
 163 check_pbo_format(GLint internalFormat,
 164                  GLenum format, GLenum type,
 165                  const struct gl_texture_format *mesa_format)
 166 {
 167    switch (internalFormat) {
 168    case 4:
 169    case GL_RGBA:
 170       return (format == GL_BGRA &&
 171               (type == GL_UNSIGNED_BYTE ||
 172                type == GL_UNSIGNED_INT_8_8_8_8_REV) &&
 173               mesa_format == &_mesa_texformat_argb8888);
 174    case 3:
 175    case GL_RGB:
 176       return (format == GL_RGB &&
 177               type == GL_UNSIGNED_SHORT_5_6_5 &&
 178               mesa_format == &_mesa_texformat_rgb565);
 179    case GL_YCBCR_MESA:
 180       return (type == GL_UNSIGNED_SHORT_8_8_MESA || type == GL_UNSIGNED_BYTE);
 181    default:
 182       return GL_FALSE;
 183    }
 184 }
 185
 186
 187 /* XXX: Do this for TexSubImage also:
 188  */
 189 static GLboolean
 190 try_pbo_upload(struct intel_context *intel,
 191                struct intel_texture_image *intelImage,
 192                const struct gl_pixelstore_attrib *unpack,
 193                GLint internalFormat,
 194                GLint width, GLint height,
 195                GLenum format, GLenum type, const void *pixels)
 196 {
 197    struct intel_buffer_object *pbo = intel_buffer_object(unpack->BufferObj);
 198    GLuint src_offset, src_stride;
 199    GLuint dst_offset, dst_stride;
 200
 201    if (!pbo ||
 202        intel->ctx._ImageTransferState ||
 203        unpack->SkipPixels || unpack->SkipRows) {
 204       _mesa_printf("%s: failure 1\n", __FUNCTION__);
 205       return GL_FALSE;
 206    }
 207
 208    src_offset = (GLuint) pixels;
 209
 210    if (unpack->RowLength > 0)
 211       src_stride = unpack->RowLength;
 212    else
 213       src_stride = width;
 214
 215    dst_offset = intel_miptree_image_offset(intelImage->mt,
 216                                            intelImage->face,
 217                                            intelImage->level);
 218
 219    dst_stride = intelImage->mt->pitch;
 220
 221    intelFlush(&intel->ctx);
 222    LOCK_HARDWARE(intel);
 223    {
 224       dri_bo *src_buffer = intel_bufferobj_buffer(intel, pbo, INTEL_READ);
 225       dri_bo *dst_buffer = intel_region_buffer(intel->intelScreen,
 226                                                intelImage->mt->region,
 227                                                INTEL_WRITE_FULL);
 228
 229
 230       intelEmitCopyBlit(intel,
 231                         intelImage->mt->cpp,
 232                         src_stride, src_buffer, src_offset,
 233                         dst_stride, dst_buffer, dst_offset,
 234                         0, 0, 0, 0, width, height,
 235                         GL_COPY);
 236
 237       intel_batchbuffer_flush(intel->batch);
 238    }
 239    UNLOCK_HARDWARE(intel);
 240
 241    return GL_TRUE;
 242 }
 243
 244
 245
 246 static GLboolean
 247 try_pbo_zcopy(struct intel_context *intel,
 248               struct intel_texture_image *intelImage,
 249               const struct gl_pixelstore_attrib *unpack,
 250               GLint internalFormat,
 251               GLint width, GLint height,
 252               GLenum format, GLenum type, const void *pixels)
 253 {
 254    struct intel_buffer_object *pbo = intel_buffer_object(unpack->BufferObj);
 255    GLuint src_offset, src_stride;
 256    GLuint dst_offset, dst_stride;
 257
 258    if (!pbo ||
 259        intel->ctx._ImageTransferState ||
 260        unpack->SkipPixels || unpack->SkipRows) {
 261       _mesa_printf("%s: failure 1\n", __FUNCTION__);
 262       return GL_FALSE;
 263    }
 264
 265    src_offset = (GLuint) pixels;
 266
 267    if (unpack->RowLength > 0)
 268       src_stride = unpack->RowLength;
 269    else
 270       src_stride = width;
 271
 272    dst_offset = intel_miptree_image_offset(intelImage->mt,
 273                                            intelImage->face,
 274                                            intelImage->level);
 275
 276    dst_stride = intelImage->mt->pitch;
 277
 278    if (src_stride != dst_stride || dst_offset != 0 || src_offset != 0) {
 279       _mesa_printf("%s: failure 2\n", __FUNCTION__);
 280       return GL_FALSE;
 281    }
 282
 283    intel_region_attach_pbo(intel->intelScreen, intelImage->mt->region, pbo);
 284
 285    return GL_TRUE;
 286 }
 287
 288
 289
 290
 291
 292
 293 static void
 294 intelTexImage(GLcontext * ctx,
 295               GLint dims,
 296               GLenum target, GLint level,
 297               GLint internalFormat,
 298               GLint width, GLint height, GLint depth,
 299               GLint border,
 300               GLenum format, GLenum type, const void *pixels,
 301               const struct gl_pixelstore_attrib *unpack,
 302               struct gl_texture_object *texObj,
 303               struct gl_texture_image *texImage, GLsizei imageSize, int compressed)
 304 {
 305    struct intel_context *intel = intel_context(ctx);
 306    struct intel_texture_object *intelObj = intel_texture_object(texObj);
 307    struct intel_texture_image *intelImage = intel_texture_image(texImage);
 308    GLint postConvWidth = width;
 309    GLint postConvHeight = height;
 310    GLint texelBytes, sizeInBytes;
 311    GLuint dstRowStride;
 312
 313
 314    DBG("%s target %s level %d %dx%dx%d border %d\n", __FUNCTION__,
 315        _mesa_lookup_enum_by_nr(target), level, width, height, depth, border);
 316
 317    intelFlush(ctx);
 318
 319    intelImage->face = target_to_face(target);
 320    intelImage->level = level;
 321
 322    if (ctx->_ImageTransferState & IMAGE_CONVOLUTION_BIT) {
 323       _mesa_adjust_image_for_convolution(ctx, dims, &postConvWidth,
 324                                          &postConvHeight);
 325    }
 326
 327    /* choose the texture format */
 328    texImage->TexFormat = intelChooseTextureFormat(ctx, internalFormat,
 329                                                   format, type);
 330
 331    _mesa_set_fetch_functions(texImage, dims);
 332
 333    if (texImage->TexFormat->TexelBytes == 0) {
 334       /* must be a compressed format */
 335       texelBytes = 0;
 336       texImage->IsCompressed = GL_TRUE;
 337       texImage->CompressedSize =
 338          ctx->Driver.CompressedTextureSize(ctx, texImage->Width,
 339                                            texImage->Height, texImage->Depth,
 340                                            texImage->TexFormat->MesaFormat);
 341    } else {
 342       texelBytes = texImage->TexFormat->TexelBytes;
 343
 344       /* Minimum pitch of 32 bytes */
 345       if (postConvWidth * texelBytes < 32) {
 346          postConvWidth = 32 / texelBytes;
 347          texImage->RowStride = postConvWidth;
 348       }
 349
 350       assert(texImage->RowStride == postConvWidth);
 351    }
 352
 353    /* Release the reference to a potentially orphaned buffer.
 354     * Release any old malloced memory.
 355     */
 356    if (intelImage->mt) {
 357       intel_miptree_release(intel, &intelImage->mt);
 358       assert(!texImage->Data);
 359    }
 360    else if (texImage->Data) {
 361       _mesa_align_free(texImage->Data);
 362    }
 363
 364    /* If this is the only texture image in the tree, could call
 365     * bmBufferData with NULL data to free the old block and avoid
 366     * waiting on any outstanding fences.
 367     */
 368    if (intelObj->mt &&
 369        intelObj->mt->first_level == level &&
 370        intelObj->mt->last_level == level &&
 371        intelObj->mt->target != GL_TEXTURE_CUBE_MAP_ARB &&
 372        !intel_miptree_match_image(intelObj->mt, &intelImage->base,
 373                                   intelImage->face, intelImage->level)) {
 374
 375       DBG("release it\n");
 376       intel_miptree_release(intel, &intelObj->mt);
 377       assert(!intelObj->mt);
 378    }
 379
 380    if (!intelObj->mt) {
 381       guess_and_alloc_mipmap_tree(intel, intelObj, intelImage);
 382       if (!intelObj->mt) {
 383          DBG("guess_and_alloc_mipmap_tree: failed\n");
 384       }
 385    }
 386
 387    assert(!intelImage->mt);
 388
 389    if (intelObj->mt &&
 390        intel_miptree_match_image(intelObj->mt, &intelImage->base,
 391                                  intelImage->face, intelImage->level)) {
 392
 393       intel_miptree_reference(&intelImage->mt, intelObj->mt);
 394       assert(intelImage->mt);
 395    }
 396
 397    if (!intelImage->mt)
 398       DBG("XXX: Image did not fit into tree - storing in local memory!\n");
 399
 400    /* PBO fastpaths:
 401     */
 402    if (dims <= 2 &&
 403        intelImage->mt &&
 404        intel_buffer_object(unpack->BufferObj) &&
 405        check_pbo_format(internalFormat, format,
 406                         type, intelImage->base.TexFormat)) {
 407
 408       DBG("trying pbo upload\n");
 409
 410       /* Attempt to texture directly from PBO data (zero copy upload).
 411        *
 412        * Currently disable as it can lead to worse as well as better
 413        * performance (in particular when intel_region_cow() is
 414        * required).
 415        */
 416       if (intelObj->mt == intelImage->mt &&
 417           intelObj->mt->first_level == level &&
 418           intelObj->mt->last_level == level) {
 419
 420          if (try_pbo_zcopy(intel, intelImage, unpack,
 421                            internalFormat,
 422                            width, height, format, type, pixels)) {
 423
 424             DBG("pbo zcopy upload succeeded\n");
 425             return;
 426          }
 427       }
 428
 429
 430       /* Otherwise, attempt to use the blitter for PBO image uploads.
 431        */
 432       if (try_pbo_upload(intel, intelImage, unpack,
 433                          internalFormat,
 434                          width, height, format, type, pixels)) {
 435          DBG("pbo upload succeeded\n");
 436          return;
 437       }
 438
 439       DBG("pbo upload failed\n");
 440    }
 441
 442
 443
 444    /* intelCopyTexImage calls this function with pixels == NULL, with
 445     * the expectation that the mipmap tree will be set up but nothing
 446     * more will be done.  This is where those calls return:
 447     */
 448    if (compressed) {
 449       pixels = _mesa_validate_pbo_compressed_teximage(ctx, imageSize, pixels,
 450                                                       unpack,
 451                                                       "glCompressedTexImage");
 452    } else {
 453       pixels = _mesa_validate_pbo_teximage(ctx, dims, width, height, 1,
 454                                            format, type,
 455                                            pixels, unpack, "glTexImage");
 456    }
 457    if (!pixels)
 458       return;
 459
 460
 461    if (intelImage->mt)
 462       intel_region_idle(intel->intelScreen, intelImage->mt->region);
 463
 464    LOCK_HARDWARE(intel);
 465
 466    if (intelImage->mt) {
 467       texImage->Data = intel_miptree_image_map(intel,
 468                                                intelImage->mt,
 469                                                intelImage->face,
 470                                                intelImage->level,
 471                                                &dstRowStride,
 472                                                intelImage->base.ImageOffsets);
 473    }
 474    else {
 475       /* Allocate regular memory and store the image there temporarily.   */
 476       if (texImage->IsCompressed) {
 477          sizeInBytes = texImage->CompressedSize;
 478          dstRowStride =
 479             _mesa_compressed_row_stride(texImage->TexFormat->MesaFormat, width);
 480          assert(dims != 3);
 481       }
 482       else {
 483          dstRowStride = postConvWidth * texelBytes;
 484          sizeInBytes = depth * dstRowStride * postConvHeight;
 485       }
 486
 487       texImage->Data = malloc(sizeInBytes);
 488    }
 489
 490    DBG("Upload image %dx%dx%d row_len %x "
 491        "pitch %x\n",
 492        width, height, depth, width * texelBytes, dstRowStride);
 493
 494    /* Copy data.  Would like to know when it's ok for us to eg. use
 495     * the blitter to copy.  Or, use the hardware to do the format
 496     * conversion and copy:
 497     */
 498    if (compressed) {
 499      memcpy(texImage->Data, pixels, imageSize);
 500    } else if (!texImage->TexFormat->StoreImage(ctx, dims,
 501                                                texImage->_BaseFormat,
 502                                                texImage->TexFormat,
 503                                                texImage->Data, 0, 0, 0, /* dstX/Y/Zoffset */
 504                                                dstRowStride,
 505                                                texImage->ImageOffsets,
 506                                                width, height, depth,
 507                                                format, type, pixels, unpack)) {
 508       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glTexImage");
 509    }
 510
 511    _mesa_unmap_teximage_pbo(ctx, unpack);
 512
 513    if (intelImage->mt) {
 514       intel_miptree_image_unmap(intel, intelImage->mt);
 515       texImage->Data = NULL;
 516    }
 517
 518    UNLOCK_HARDWARE(intel);
 519
 520 #if 0
 521    /* GL_SGIS_generate_mipmap -- this can be accelerated now.
 522     */
 523    if (level == texObj->BaseLevel && texObj->GenerateMipmap) {
 524       intel_generate_mipmap(ctx, target,
 525                             &ctx->Texture.Unit[ctx->Texture.CurrentUnit],
 526                             texObj);
 527    }
 528 #endif
 529 }
 530
 531 void
 532 intelTexImage3D(GLcontext * ctx,
 533                 GLenum target, GLint level,
 534                 GLint internalFormat,
 535                 GLint width, GLint height, GLint depth,
 536                 GLint border,
 537                 GLenum format, GLenum type, const void *pixels,
 538                 const struct gl_pixelstore_attrib *unpack,
 539                 struct gl_texture_object *texObj,
 540                 struct gl_texture_image *texImage)
 541 {
 542    intelTexImage(ctx, 3, target, level,
 543                  internalFormat, width, height, depth, border,
 544                  format, type, pixels, unpack, texObj, texImage, 0, 0);
 545 }
 546
 547
 548 void
 549 intelTexImage2D(GLcontext * ctx,
 550                 GLenum target, GLint level,
 551                 GLint internalFormat,
 552                 GLint width, GLint height, GLint border,
 553                 GLenum format, GLenum type, const void *pixels,
 554                 const struct gl_pixelstore_attrib *unpack,
 555                 struct gl_texture_object *texObj,
 556                 struct gl_texture_image *texImage)
 557 {
 558    intelTexImage(ctx, 2, target, level,
 559                  internalFormat, width, height, 1, border,
 560                  format, type, pixels, unpack, texObj, texImage, 0, 0);
 561 }
 562
 563 void
 564 intelTexImage1D(GLcontext * ctx,
 565                 GLenum target, GLint level,
 566                 GLint internalFormat,
 567                 GLint width, GLint border,
 568                 GLenum format, GLenum type, const void *pixels,
 569                 const struct gl_pixelstore_attrib *unpack,
 570                 struct gl_texture_object *texObj,
 571                 struct gl_texture_image *texImage)
 572 {
 573    intelTexImage(ctx, 1, target, level,
 574                  internalFormat, width, 1, 1, border,
 575                  format, type, pixels, unpack, texObj, texImage, 0, 0);
 576 }
 577
 578 void intelCompressedTexImage2D( GLcontext *ctx, GLenum target, GLint level,
 579                                 GLint internalFormat,
 580                                 GLint width, GLint height, GLint border,
 581                                 GLsizei imageSize, const GLvoid *data,
 582                                 struct gl_texture_object *texObj,
 583                                 struct gl_texture_image *texImage )
 584 {
 585    intelTexImage(ctx, 2, target, level,
 586                  internalFormat, width, height, 1, border,
 587                  0, 0, data, &ctx->Unpack, texObj, texImage, imageSize, 1);
 588 }
 589
 590 /**
 591  * Need to map texture image into memory before copying image data,
 592  * then unmap it.
 593  */
 594 static void
 595 intel_get_tex_image(GLcontext * ctx, GLenum target, GLint level,
 596                     GLenum format, GLenum type, GLvoid * pixels,
 597                     struct gl_texture_object *texObj,
 598                     struct gl_texture_image *texImage, int compressed)
 599 {
 600    struct intel_context *intel = intel_context(ctx);
 601    struct intel_texture_image *intelImage = intel_texture_image(texImage);
 602
 603    /* Map */
 604    if (intelImage->mt) {
 605       /* Image is stored in hardware format in a buffer managed by the
 606        * kernel.  Need to explicitly map and unmap it.
 607        */
 608       intelImage->base.Data =
 609          intel_miptree_image_map(intel,
 610                                  intelImage->mt,
 611                                  intelImage->face,
 612                                  intelImage->level,
 613                                  &intelImage->base.RowStride,
 614                                  intelImage->base.ImageOffsets);
 615       intelImage->base.RowStride /= intelImage->mt->cpp;
 616    }
 617    else {
 618       /* Otherwise, the image should actually be stored in
 619        * intelImage->base.Data.  This is pretty confusing for
 620        * everybody, I'd much prefer to separate the two functions of
 621        * texImage->Data - storage for texture images in main memory
 622        * and access (ie mappings) of images.  In other words, we'd
 623        * create a new texImage->Map field and leave Data simply for
 624        * storage.
 625        */
 626       assert(intelImage->base.Data);
 627    }
 628
 629
 630    if (compressed) {
 631       _mesa_get_compressed_teximage(ctx, target, level, pixels,
 632                                     texObj, texImage);
 633    } else {
 634       _mesa_get_teximage(ctx, target, level, format, type, pixels,
 635                          texObj, texImage);
 636    }
 637
 638
 639    /* Unmap */
 640    if (intelImage->mt) {
 641       intel_miptree_image_unmap(intel, intelImage->mt);
 642       intelImage->base.Data = NULL;
 643    }
 644 }
 645
 646 void
 647 intelGetTexImage(GLcontext * ctx, GLenum target, GLint level,
 648                  GLenum format, GLenum type, GLvoid * pixels,
 649                  struct gl_texture_object *texObj,
 650                  struct gl_texture_image *texImage)
 651 {
 652    intel_get_tex_image(ctx, target, level, format, type, pixels,
 653                        texObj, texImage, 0);
 654
 655
 656 }
 657
 658 void
 659 intelGetCompressedTexImage(GLcontext *ctx, GLenum target, GLint level,
 660                            GLvoid *pixels,
 661                            const struct gl_texture_object *texObj,
 662                            const struct gl_texture_image *texImage)
 663 {
 664    intel_get_tex_image(ctx, target, level, 0, 0, pixels,
 665                        texObj, texImage, 1);
 666
 667 }
 668
 669 void
 670 intelSetTexOffset(__DRIcontext *pDRICtx, GLint texname,
 671                   unsigned long long offset, GLint depth, GLuint pitch)
 672 {
 673    struct intel_context *intel = (struct intel_context*)
 674       ((__DRIcontextPrivate*)pDRICtx->private)->driverPrivate;
 675    struct gl_texture_object *tObj = _mesa_lookup_texture(&intel->ctx, texname);
 676    struct intel_texture_object *intelObj = intel_texture_object(tObj);
 677
 678    if (!intelObj)
 679       return;
 680
 681    if (intelObj->mt)
 682       intel_miptree_release(intel, &intelObj->mt);
 683
 684    intelObj->imageOverride = GL_TRUE;
 685    intelObj->depthOverride = depth;
 686    intelObj->pitchOverride = pitch;
 687
 688    if (offset)
 689       intelObj->textureOffset = offset;
 690 }