src/mesa/main/texgetimage.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (c) 2009 VMware, Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions 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 MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 /**
  28  * Code for glGetTexImage() and glGetCompressedTexImage().
  29  */
  30
  31
  32 #include "glheader.h"
  33 #include "bufferobj.h"
  34 #include "enums.h"
  35 #include "context.h"
  36 #include "formats.h"
  37 #include "format_unpack.h"
  38 #include "glformats.h"
  39 #include "image.h"
  40 #include "mtypes.h"
  41 #include "pack.h"
  42 #include "pbo.h"
  43 #include "pixelstore.h"
  44 #include "texcompress.h"
  45 #include "texgetimage.h"
  46 #include "teximage.h"
  47 #include "texobj.h"
  48 #include "texstore.h"
  49 #include "format_utils.h"
  50 #include "pixeltransfer.h"
  51
  52 /**
  53  * Can the given type represent negative values?
  54  */
  55 static inline GLboolean
  56 type_needs_clamping(GLenum type)
  57 {
  58    switch (type) {
  59    case GL_BYTE:
  60    case GL_SHORT:
  61    case GL_INT:
  62    case GL_FLOAT:
  63    case GL_HALF_FLOAT_ARB:
  64    case GL_UNSIGNED_INT_10F_11F_11F_REV:
  65    case GL_UNSIGNED_INT_5_9_9_9_REV:
  66       return GL_FALSE;
  67    default:
  68       return GL_TRUE;
  69    }
  70 }
  71
  72
  73 /**
  74  * glGetTexImage for depth/Z pixels.
  75  */
  76 static void
  77 get_tex_depth(struct gl_context *ctx, GLuint dimensions,
  78               GLint xoffset, GLint yoffset, GLint zoffset,
  79               GLsizei width, GLsizei height, GLint depth,
  80               GLenum format, GLenum type, GLvoid *pixels,
  81               struct gl_texture_image *texImage)
  82 {
  83    GLint img, row;
  84    GLfloat *depthRow = malloc(width * sizeof(GLfloat));
  85
  86    if (!depthRow) {
  87       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
  88       return;
  89    }
  90
  91    for (img = 0; img < depth; img++) {
  92       GLubyte *srcMap;
  93       GLint srcRowStride;
  94
  95       /* map src texture buffer */
  96       ctx->Driver.MapTextureImage(ctx, texImage, zoffset + img,
  97                                   xoffset, yoffset, width, height,
  98                                   GL_MAP_READ_BIT, &srcMap, &srcRowStride);
  99
 100       if (srcMap) {
 101          for (row = 0; row < height; row++) {
 102             void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 103                                              width, height, format, type,
 104                                              img, row, 0);
 105             const GLubyte *src = srcMap + row * srcRowStride;
 106             _mesa_unpack_float_z_row(texImage->TexFormat, width, src, depthRow);
 107             _mesa_pack_depth_span(ctx, width, dest, type, depthRow, &ctx->Pack);
 108          }
 109
 110          ctx->Driver.UnmapTextureImage(ctx, texImage, zoffset + img);
 111       }
 112       else {
 113          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 114          break;
 115       }
 116    }
 117
 118    free(depthRow);
 119 }
 120
 121
 122 /**
 123  * glGetTexImage for depth/stencil pixels.
 124  */
 125 static void
 126 get_tex_depth_stencil(struct gl_context *ctx, GLuint dimensions,
 127                       GLint xoffset, GLint yoffset, GLint zoffset,
 128                       GLsizei width, GLsizei height, GLint depth,
 129                       GLenum format, GLenum type, GLvoid *pixels,
 130                       struct gl_texture_image *texImage)
 131 {
 132    GLint img, row;
 133
 134    assert(format == GL_DEPTH_STENCIL);
 135    assert(type == GL_UNSIGNED_INT_24_8 ||
 136           type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
 137
 138    for (img = 0; img < depth; img++) {
 139       GLubyte *srcMap;
 140       GLint rowstride;
 141
 142       /* map src texture buffer */
 143       ctx->Driver.MapTextureImage(ctx, texImage, zoffset + img,
 144                                   xoffset, yoffset, width, height,
 145                                   GL_MAP_READ_BIT, &srcMap, &rowstride);
 146
 147       if (srcMap) {
 148          for (row = 0; row < height; row++) {
 149             const GLubyte *src = srcMap + row * rowstride;
 150             void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 151                                              width, height, format, type,
 152                                              img, row, 0);
 153             _mesa_unpack_depth_stencil_row(texImage->TexFormat,
 154                                            width,
 155                                            (const GLuint *) src,
 156                                            type, dest);
 157             if (ctx->Pack.SwapBytes) {
 158                _mesa_swap4((GLuint *) dest, width);
 159             }
 160          }
 161
 162          ctx->Driver.UnmapTextureImage(ctx, texImage, zoffset + img);
 163       }
 164       else {
 165          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 166          break;
 167       }
 168    }
 169 }
 170
 171 /**
 172  * glGetTexImage for stencil pixels.
 173  */
 174 static void
 175 get_tex_stencil(struct gl_context *ctx, GLuint dimensions,
 176                 GLint xoffset, GLint yoffset, GLint zoffset,
 177                 GLsizei width, GLsizei height, GLint depth,
 178                 GLenum format, GLenum type, GLvoid *pixels,
 179                 struct gl_texture_image *texImage)
 180 {
 181    GLint img, row;
 182
 183    assert(format == GL_STENCIL_INDEX);
 184
 185    for (img = 0; img < depth; img++) {
 186       GLubyte *srcMap;
 187       GLint rowstride;
 188
 189       /* map src texture buffer */
 190       ctx->Driver.MapTextureImage(ctx, texImage, zoffset + img,
 191                                   xoffset, yoffset, width, height,
 192                                   GL_MAP_READ_BIT,
 193                                   &srcMap, &rowstride);
 194
 195       if (srcMap) {
 196          for (row = 0; row < height; row++) {
 197             const GLubyte *src = srcMap + row * rowstride;
 198             void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 199                                              width, height, format, type,
 200                                              img, row, 0);
 201             _mesa_unpack_ubyte_stencil_row(texImage->TexFormat,
 202                                            width,
 203                                            (const GLuint *) src,
 204                                            dest);
 205          }
 206
 207          ctx->Driver.UnmapTextureImage(ctx, texImage, zoffset + img);
 208       }
 209       else {
 210          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 211          break;
 212       }
 213    }
 214 }
 215
 216
 217 /**
 218  * glGetTexImage for YCbCr pixels.
 219  */
 220 static void
 221 get_tex_ycbcr(struct gl_context *ctx, GLuint dimensions,
 222               GLint xoffset, GLint yoffset, GLint zoffset,
 223               GLsizei width, GLsizei height, GLint depth,
 224               GLenum format, GLenum type, GLvoid *pixels,
 225               struct gl_texture_image *texImage)
 226 {
 227    GLint img, row;
 228
 229    for (img = 0; img < depth; img++) {
 230       GLubyte *srcMap;
 231       GLint rowstride;
 232
 233       /* map src texture buffer */
 234       ctx->Driver.MapTextureImage(ctx, texImage, zoffset + img,
 235                                   xoffset, yoffset, width, height,
 236                                   GL_MAP_READ_BIT, &srcMap, &rowstride);
 237
 238       if (srcMap) {
 239          for (row = 0; row < height; row++) {
 240             const GLubyte *src = srcMap + row * rowstride;
 241             void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 242                                              width, height, format, type,
 243                                              img, row, 0);
 244             memcpy(dest, src, width * sizeof(GLushort));
 245
 246             /* check for byte swapping */
 247             if ((texImage->TexFormat == MESA_FORMAT_YCBCR
 248                  && type == GL_UNSIGNED_SHORT_8_8_REV_MESA) ||
 249                 (texImage->TexFormat == MESA_FORMAT_YCBCR_REV
 250                  && type == GL_UNSIGNED_SHORT_8_8_MESA)) {
 251                if (!ctx->Pack.SwapBytes)
 252                   _mesa_swap2((GLushort *) dest, width);
 253             }
 254             else if (ctx->Pack.SwapBytes) {
 255                _mesa_swap2((GLushort *) dest, width);
 256             }
 257          }
 258
 259          ctx->Driver.UnmapTextureImage(ctx, texImage, zoffset + img);
 260       }
 261       else {
 262          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 263          break;
 264       }
 265    }
 266 }
 267
 268 /**
 269  * Depending on the base format involved we may need to apply a rebase
 270  * transform (for example: if we download to a Luminance format we want
 271  * G=0 and B=0).
 272  */
 273 static bool
 274 teximage_needs_rebase(mesa_format texFormat, GLenum baseFormat,
 275                       bool is_compressed, uint8_t *rebaseSwizzle)
 276 {
 277    bool needsRebase = false;
 278
 279    if (baseFormat == GL_LUMINANCE ||
 280        baseFormat == GL_INTENSITY) {
 281       needsRebase = true;
 282       rebaseSwizzle[0] = MESA_FORMAT_SWIZZLE_X;
 283       rebaseSwizzle[1] = MESA_FORMAT_SWIZZLE_ZERO;
 284       rebaseSwizzle[2] = MESA_FORMAT_SWIZZLE_ZERO;
 285       rebaseSwizzle[3] = MESA_FORMAT_SWIZZLE_ONE;
 286    } else if (baseFormat == GL_LUMINANCE_ALPHA) {
 287       needsRebase = true;
 288       rebaseSwizzle[0] = MESA_FORMAT_SWIZZLE_X;
 289       rebaseSwizzle[1] = MESA_FORMAT_SWIZZLE_ZERO;
 290       rebaseSwizzle[2] = MESA_FORMAT_SWIZZLE_ZERO;
 291       rebaseSwizzle[3] = MESA_FORMAT_SWIZZLE_W;
 292    } else if (!is_compressed &&
 293               (baseFormat != _mesa_get_format_base_format(texFormat))) {
 294       needsRebase =
 295          _mesa_compute_rgba2base2rgba_component_mapping(baseFormat,
 296                                                         rebaseSwizzle);
 297    }
 298
 299    return needsRebase;
 300 }
 301
 302
 303 /**
 304  * Get a color texture image with decompression.
 305  */
 306 static void
 307 get_tex_rgba_compressed(struct gl_context *ctx, GLuint dimensions,
 308                         GLint xoffset, GLint yoffset, GLint zoffset,
 309                         GLsizei width, GLsizei height, GLint depth,
 310                         GLenum format, GLenum type, GLvoid *pixels,
 311                         struct gl_texture_image *texImage,
 312                         GLbitfield transferOps)
 313 {
 314    /* don't want to apply sRGB -> RGB conversion here so override the format */
 315    const mesa_format texFormat =
 316       _mesa_get_srgb_format_linear(texImage->TexFormat);
 317    const GLenum baseFormat = _mesa_get_format_base_format(texFormat);
 318    GLfloat *tempImage, *tempSlice;
 319    GLuint slice;
 320    int srcStride, dstStride;
 321    uint32_t dstFormat;
 322    bool needsRebase;
 323    uint8_t rebaseSwizzle[4];
 324
 325    /* Decompress into temp float buffer, then pack into user buffer */
 326    tempImage = malloc(width * height * depth * 4 * sizeof(GLfloat));
 327    if (!tempImage) {
 328       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage()");
 329       return;
 330    }
 331
 332    /* Decompress the texture image slices - results in 'tempImage' */
 333    for (slice = 0; slice < depth; slice++) {
 334       GLubyte *srcMap;
 335       GLint srcRowStride;
 336
 337       tempSlice = tempImage + slice * 4 * width * height;
 338
 339       ctx->Driver.MapTextureImage(ctx, texImage, zoffset + slice,
 340                                   xoffset, yoffset, width, height,
 341                                   GL_MAP_READ_BIT,
 342                                   &srcMap, &srcRowStride);
 343       if (srcMap) {
 344          _mesa_decompress_image(texFormat, width, height,
 345                                 srcMap, srcRowStride, tempSlice);
 346
 347          ctx->Driver.UnmapTextureImage(ctx, texImage, zoffset + slice);
 348       }
 349       else {
 350          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 351          free(tempImage);
 352          return;
 353       }
 354    }
 355
 356    needsRebase = teximage_needs_rebase(texFormat, baseFormat, true,
 357                                        rebaseSwizzle);
 358
 359    srcStride = 4 * width * sizeof(GLfloat);
 360    dstStride = _mesa_image_row_stride(&ctx->Pack, width, format, type);
 361    dstFormat = _mesa_format_from_format_and_type(format, type);
 362    tempSlice = tempImage;
 363    for (slice = 0; slice < depth; slice++) {
 364       void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 365                                        width, height, format, type,
 366                                        slice, 0, 0);
 367       _mesa_format_convert(dest, dstFormat, dstStride,
 368                            tempSlice, RGBA32_FLOAT, srcStride,
 369                            width, height,
 370                            needsRebase ? rebaseSwizzle : NULL);
 371
 372       /* Handle byte swapping if required */
 373       if (ctx->Pack.SwapBytes) {
 374          _mesa_swap_bytes_2d_image(format, type, &ctx->Pack,
 375                                    width, height, dest, dest);
 376       }
 377
 378       tempSlice += 4 * width * height;
 379    }
 380
 381    free(tempImage);
 382 }
 383
 384
 385 /**
 386  * Return a base GL format given the user-requested format
 387  * for glGetTexImage().
 388  */
 389 GLenum
 390 _mesa_base_pack_format(GLenum format)
 391 {
 392    switch (format) {
 393    case GL_ABGR_EXT:
 394    case GL_BGRA:
 395    case GL_BGRA_INTEGER:
 396    case GL_RGBA_INTEGER:
 397       return GL_RGBA;
 398    case GL_BGR:
 399    case GL_BGR_INTEGER:
 400    case GL_RGB_INTEGER:
 401       return GL_RGB;
 402    case GL_RED_INTEGER:
 403       return GL_RED;
 404    case GL_GREEN_INTEGER:
 405       return GL_GREEN;
 406    case GL_BLUE_INTEGER:
 407       return GL_BLUE;
 408    case GL_ALPHA_INTEGER:
 409       return GL_ALPHA;
 410    case GL_LUMINANCE_INTEGER_EXT:
 411       return GL_LUMINANCE;
 412    case GL_LUMINANCE_ALPHA_INTEGER_EXT:
 413       return GL_LUMINANCE_ALPHA;
 414    default:
 415       return format;
 416    }
 417 }
 418
 419
 420 /**
 421  * Get an uncompressed color texture image.
 422  */
 423 static void
 424 get_tex_rgba_uncompressed(struct gl_context *ctx, GLuint dimensions,
 425                           GLint xoffset, GLint yoffset, GLint zoffset,
 426                           GLsizei width, GLsizei height, GLint depth,
 427                           GLenum format, GLenum type, GLvoid *pixels,
 428                           struct gl_texture_image *texImage,
 429                           GLbitfield transferOps)
 430 {
 431    /* don't want to apply sRGB -> RGB conversion here so override the format */
 432    const mesa_format texFormat =
 433       _mesa_get_srgb_format_linear(texImage->TexFormat);
 434    GLuint img;
 435    GLboolean dst_is_integer;
 436    uint32_t dst_format;
 437    int dst_stride;
 438    uint8_t rebaseSwizzle[4];
 439    bool needsRebase;
 440    void *rgba = NULL;
 441
 442    needsRebase = teximage_needs_rebase(texFormat, texImage->_BaseFormat, false,
 443                                        rebaseSwizzle);
 444
 445    /* Describe the dst format */
 446    dst_is_integer = _mesa_is_enum_format_integer(format);
 447    dst_format = _mesa_format_from_format_and_type(format, type);
 448    dst_stride = _mesa_image_row_stride(&ctx->Pack, width, format, type);
 449
 450    /* Since _mesa_format_convert does not handle transferOps we need to handle
 451     * them before we call the function. This requires to convert to RGBA float
 452     * first so we can call _mesa_apply_rgba_transfer_ops. If the dst format is
 453     * integer then transferOps do not apply.
 454     */
 455    assert(!transferOps || (transferOps && !dst_is_integer));
 456    (void) dst_is_integer; /* silence unused var warning */
 457
 458    for (img = 0; img < depth; img++) {
 459       GLubyte *srcMap;
 460       GLint rowstride;
 461       GLubyte *img_src;
 462       void *dest;
 463       void *src;
 464       int src_stride;
 465       uint32_t src_format;
 466
 467       /* map src texture buffer */
 468       ctx->Driver.MapTextureImage(ctx, texImage, zoffset + img,
 469                                   xoffset, yoffset, width, height,
 470                                   GL_MAP_READ_BIT,
 471                                   &srcMap, &rowstride);
 472       if (!srcMap) {
 473          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 474          goto done;
 475       }
 476
 477       img_src = srcMap;
 478       dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 479                                  width, height, format, type,
 480                                  img, 0, 0);
 481
 482       if (transferOps) {
 483          uint32_t rgba_format;
 484          int rgba_stride;
 485          bool need_convert = false;
 486
 487          /* We will convert to RGBA float */
 488          rgba_format = RGBA32_FLOAT;
 489          rgba_stride = width * 4 * sizeof(GLfloat);
 490
 491          /* If we are lucky and the dst format matches the RGBA format we need
 492           * to convert to, then we can convert directly into the dst buffer
 493           * and avoid the final conversion/copy from the rgba buffer to the dst
 494           * buffer.
 495           */
 496          if (format == rgba_format) {
 497             rgba = dest;
 498          } else {
 499             need_convert = true;
 500             if (rgba == NULL) { /* Allocate the RGBA buffer only once */
 501                rgba = malloc(height * rgba_stride);
 502                if (!rgba) {
 503                   _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage()");
 504                   ctx->Driver.UnmapTextureImage(ctx, texImage, img);
 505                   return;
 506                }
 507             }
 508          }
 509
 510          _mesa_format_convert(rgba, rgba_format, rgba_stride,
 511                               img_src, texFormat, rowstride,
 512                               width, height,
 513                               needsRebase ? rebaseSwizzle : NULL);
 514
 515          /* Handle transfer ops now */
 516          _mesa_apply_rgba_transfer_ops(ctx, transferOps, width * height, rgba);
 517
 518          /* If we had to rebase, we have already handled that */
 519          needsRebase = false;
 520
 521          /* If we were lucky and our RGBA conversion matches the dst format,
 522           * then we are done.
 523           */
 524          if (!need_convert)
 525             goto do_swap;
 526
 527          /* Otherwise, we need to convert from RGBA to dst next */
 528          src = rgba;
 529          src_format = rgba_format;
 530          src_stride = rgba_stride;
 531       } else {
 532          /* No RGBA conversion needed, convert directly to dst */
 533          src = img_src;
 534          src_format = texFormat;
 535          src_stride = rowstride;
 536       }
 537
 538       /* Do the conversion to destination format */
 539       _mesa_format_convert(dest, dst_format, dst_stride,
 540                            src, src_format, src_stride,
 541                            width, height,
 542                            needsRebase ? rebaseSwizzle : NULL);
 543
 544    do_swap:
 545       /* Handle byte swapping if required */
 546       if (ctx->Pack.SwapBytes)
 547          _mesa_swap_bytes_2d_image(format, type, &ctx->Pack,
 548                                    width, height, dest, dest);
 549
 550       /* Unmap the src texture buffer */
 551       ctx->Driver.UnmapTextureImage(ctx, texImage, zoffset + img);
 552    }
 553
 554 done:
 555    free(rgba);
 556 }
 557
 558
 559 /**
 560  * glGetTexImage for color formats (RGBA, RGB, alpha, LA, etc).
 561  * Compressed textures are handled here as well.
 562  */
 563 static void
 564 get_tex_rgba(struct gl_context *ctx, GLuint dimensions,
 565              GLint xoffset, GLint yoffset, GLint zoffset,
 566              GLsizei width, GLsizei height, GLint depth,
 567              GLenum format, GLenum type, GLvoid *pixels,
 568              struct gl_texture_image *texImage)
 569 {
 570    const GLenum dataType = _mesa_get_format_datatype(texImage->TexFormat);
 571    GLbitfield transferOps = 0x0;
 572
 573    /* In general, clamping does not apply to glGetTexImage, except when
 574     * the returned type of the image can't hold negative values.
 575     */
 576    if (type_needs_clamping(type)) {
 577       /* the returned image type can't have negative values */
 578       if (dataType == GL_FLOAT ||
 579           dataType == GL_HALF_FLOAT ||
 580           dataType == GL_SIGNED_NORMALIZED ||
 581           format == GL_LUMINANCE ||
 582           format == GL_LUMINANCE_ALPHA) {
 583          transferOps |= IMAGE_CLAMP_BIT;
 584       }
 585    }
 586
 587    if (_mesa_is_format_compressed(texImage->TexFormat)) {
 588       get_tex_rgba_compressed(ctx, dimensions,
 589                               xoffset, yoffset, zoffset,
 590                               width, height, depth,
 591                               format, type,
 592                               pixels, texImage, transferOps);
 593    }
 594    else {
 595       get_tex_rgba_uncompressed(ctx, dimensions,
 596                                 xoffset, yoffset, zoffset,
 597                                 width, height, depth,
 598                                 format, type,
 599                                 pixels, texImage, transferOps);
 600    }
 601 }
 602
 603
 604 /**
 605  * Try to do glGetTexImage() with simple memcpy().
 606  * \return GL_TRUE if done, GL_FALSE otherwise
 607  */
 608 static GLboolean
 609 get_tex_memcpy(struct gl_context *ctx,
 610                GLint xoffset, GLint yoffset, GLint zoffset,
 611                GLsizei width, GLsizei height, GLint depth,
 612                GLenum format, GLenum type, GLvoid *pixels,
 613                struct gl_texture_image *texImage)
 614 {
 615    const GLenum target = texImage->TexObject->Target;
 616    GLboolean memCopy = GL_FALSE;
 617    GLenum texBaseFormat = _mesa_get_format_base_format(texImage->TexFormat);
 618
 619    /*
 620     * Check if we can use memcpy to copy from the hardware texture
 621     * format to the user's format/type.
 622     * Note that GL's pixel transfer ops don't apply to glGetTexImage()
 623     */
 624    if ((target == GL_TEXTURE_1D ||
 625         target == GL_TEXTURE_2D ||
 626         target == GL_TEXTURE_RECTANGLE ||
 627         _mesa_is_cube_face(target)) &&
 628        texBaseFormat == texImage->_BaseFormat) {
 629       memCopy = _mesa_format_matches_format_and_type(texImage->TexFormat,
 630                                                      format, type,
 631                                                      ctx->Pack.SwapBytes, NULL);
 632    }
 633
 634    if (depth > 1) {
 635       /* only a single slice is supported at this time */
 636       memCopy = FALSE;
 637    }
 638
 639    if (memCopy) {
 640       const GLuint bpp = _mesa_get_format_bytes(texImage->TexFormat);
 641       const GLint bytesPerRow = width * bpp;
 642       GLubyte *dst =
 643          _mesa_image_address2d(&ctx->Pack, pixels, width, height,
 644                                format, type, 0, 0);
 645       const GLint dstRowStride =
 646          _mesa_image_row_stride(&ctx->Pack, width, format, type);
 647       GLubyte *src;
 648       GLint srcRowStride;
 649
 650       /* map src texture buffer */
 651       ctx->Driver.MapTextureImage(ctx, texImage, zoffset,
 652                                   xoffset, yoffset, width, height,
 653                                   GL_MAP_READ_BIT, &src, &srcRowStride);
 654
 655       if (src) {
 656          if (bytesPerRow == dstRowStride && bytesPerRow == srcRowStride) {
 657             memcpy(dst, src, bytesPerRow * height);
 658          }
 659          else {
 660             GLuint row;
 661             for (row = 0; row < height; row++) {
 662                memcpy(dst, src, bytesPerRow);
 663                dst += dstRowStride;
 664                src += srcRowStride;
 665             }
 666          }
 667
 668          /* unmap src texture buffer */
 669          ctx->Driver.UnmapTextureImage(ctx, texImage, zoffset);
 670       }
 671       else {
 672          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 673       }
 674    }
 675
 676    return memCopy;
 677 }
 678
 679
 680 /**
 681  * This is the software fallback for Driver.GetTexSubImage().
 682  * All error checking will have been done before this routine is called.
 683  * We'll call ctx->Driver.MapTextureImage() to access the data, then
 684  * unmap with ctx->Driver.UnmapTextureImage().
 685  */
 686 void
 687 _mesa_GetTexSubImage_sw(struct gl_context *ctx,
 688                         GLint xoffset, GLint yoffset, GLint zoffset,
 689                         GLsizei width, GLsizei height, GLint depth,
 690                         GLenum format, GLenum type, GLvoid *pixels,
 691                         struct gl_texture_image *texImage)
 692 {
 693    const GLuint dimensions =
 694       _mesa_get_texture_dimensions(texImage->TexObject->Target);
 695
 696    /* map dest buffer, if PBO */
 697    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 698       /* Packing texture image into a PBO.
 699        * Map the (potentially) VRAM-based buffer into our process space so
 700        * we can write into it with the code below.
 701        * A hardware driver might use a sophisticated blit to move the
 702        * texture data to the PBO if the PBO is in VRAM along with the texture.
 703        */
 704       GLubyte *buf = (GLubyte *)
 705          ctx->Driver.MapBufferRange(ctx, 0, ctx->Pack.BufferObj->Size,
 706                                     GL_MAP_WRITE_BIT, ctx->Pack.BufferObj,
 707                                     MAP_INTERNAL);
 708       if (!buf) {
 709          /* out of memory or other unexpected error */
 710          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage(map PBO failed)");
 711          return;
 712       }
 713       /* <pixels> was an offset into the PBO.
 714        * Now make it a real, client-side pointer inside the mapped region.
 715        */
 716       pixels = ADD_POINTERS(buf, pixels);
 717    }
 718
 719    /* for all array textures, the Z axis selects the layer */
 720    if (texImage->TexObject->Target == GL_TEXTURE_1D_ARRAY) {
 721       depth = height;
 722       height = 1;
 723       zoffset = yoffset;
 724       yoffset = 0;
 725       assert(zoffset + depth <= texImage->Height);
 726    } else {
 727       assert(zoffset + depth <= texImage->Depth);
 728    }
 729
 730    if (get_tex_memcpy(ctx, xoffset, yoffset, zoffset, width, height, depth,
 731                       format, type, pixels, texImage)) {
 732       /* all done */
 733    }
 734    else if (format == GL_DEPTH_COMPONENT) {
 735       get_tex_depth(ctx, dimensions, xoffset, yoffset, zoffset,
 736                     width, height, depth, format, type, pixels, texImage);
 737    }
 738    else if (format == GL_DEPTH_STENCIL_EXT) {
 739       get_tex_depth_stencil(ctx, dimensions, xoffset, yoffset, zoffset,
 740                             width, height, depth, format, type, pixels,
 741                             texImage);
 742    }
 743    else if (format == GL_STENCIL_INDEX) {
 744       get_tex_stencil(ctx, dimensions, xoffset, yoffset, zoffset,
 745                       width, height, depth, format, type, pixels, texImage);
 746    }
 747    else if (format == GL_YCBCR_MESA) {
 748       get_tex_ycbcr(ctx, dimensions, xoffset, yoffset, zoffset,
 749                     width, height, depth, format, type, pixels, texImage);
 750    }
 751    else {
 752       get_tex_rgba(ctx, dimensions, xoffset, yoffset, zoffset,
 753                    width, height, depth, format, type, pixels, texImage);
 754    }
 755
 756    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 757       ctx->Driver.UnmapBuffer(ctx, ctx->Pack.BufferObj, MAP_INTERNAL);
 758    }
 759 }
 760
 761
 762
 763 /**
 764  * This function assumes that all error checking has been done.
 765  */
 766 static void
 767 get_compressed_texsubimage_sw(struct gl_context *ctx,
 768                               struct gl_texture_image *texImage,
 769                               GLint xoffset, GLint yoffset,
 770                               GLint zoffset, GLsizei width,
 771                               GLint height, GLint depth,
 772                               GLvoid *img)
 773 {
 774    const GLuint dimensions =
 775       _mesa_get_texture_dimensions(texImage->TexObject->Target);
 776    struct compressed_pixelstore store;
 777    GLint slice;
 778    GLubyte *dest;
 779
 780    _mesa_compute_compressed_pixelstore(dimensions, texImage->TexFormat,
 781                                        width, height, depth,
 782                                        &ctx->Pack, &store);
 783
 784    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 785       /* pack texture image into a PBO */
 786       dest = (GLubyte *)
 787          ctx->Driver.MapBufferRange(ctx, 0, ctx->Pack.BufferObj->Size,
 788                                     GL_MAP_WRITE_BIT, ctx->Pack.BufferObj,
 789                                     MAP_INTERNAL);
 790       if (!dest) {
 791          /* out of memory or other unexpected error */
 792          _mesa_error(ctx, GL_OUT_OF_MEMORY,
 793                      "glGetCompresssedTexImage(map PBO failed)");
 794          return;
 795       }
 796       dest = ADD_POINTERS(dest, img);
 797    } else {
 798       dest = img;
 799    }
 800
 801    dest += store.SkipBytes;
 802
 803    for (slice = 0; slice < store.CopySlices; slice++) {
 804       GLint srcRowStride;
 805       GLubyte *src;
 806
 807       /* map src texture buffer */
 808       ctx->Driver.MapTextureImage(ctx, texImage, zoffset + slice,
 809                                   xoffset, yoffset, width, height,
 810                                   GL_MAP_READ_BIT, &src, &srcRowStride);
 811
 812       if (src) {
 813          GLint i;
 814          for (i = 0; i < store.CopyRowsPerSlice; i++) {
 815             memcpy(dest, src, store.CopyBytesPerRow);
 816             dest += store.TotalBytesPerRow;
 817             src += srcRowStride;
 818          }
 819
 820          ctx->Driver.UnmapTextureImage(ctx, texImage, zoffset + slice);
 821
 822          /* Advance to next slice */
 823          dest += store.TotalBytesPerRow * (store.TotalRowsPerSlice -
 824                                            store.CopyRowsPerSlice);
 825
 826       } else {
 827          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetCompresssedTexImage");
 828       }
 829    }
 830
 831    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 832       ctx->Driver.UnmapBuffer(ctx, ctx->Pack.BufferObj, MAP_INTERNAL);
 833    }
 834 }
 835
 836
 837 /**
 838  * Validate the texture target enum supplied to glGetTex(ture)Image or
 839  * glGetCompressedTex(ture)Image.
 840  */
 841 static GLboolean
 842 legal_getteximage_target(struct gl_context *ctx, GLenum target, bool dsa)
 843 {
 844    switch (target) {
 845    case GL_TEXTURE_1D:
 846    case GL_TEXTURE_2D:
 847    case GL_TEXTURE_3D:
 848       return GL_TRUE;
 849    case GL_TEXTURE_RECTANGLE_NV:
 850       return ctx->Extensions.NV_texture_rectangle;
 851    case GL_TEXTURE_1D_ARRAY_EXT:
 852    case GL_TEXTURE_2D_ARRAY_EXT:
 853       return ctx->Extensions.EXT_texture_array;
 854    case GL_TEXTURE_CUBE_MAP_ARRAY:
 855       return ctx->Extensions.ARB_texture_cube_map_array;
 856
 857    /* Section 8.11 (Texture Queries) of the OpenGL 4.5 core profile spec
 858     * (30.10.2014) says:
 859     *    "An INVALID_ENUM error is generated if the effective target is not
 860     *    one of TEXTURE_1D, TEXTURE_2D, TEXTURE_3D, TEXTURE_1D_ARRAY,
 861     *    TEXTURE_2D_ARRAY, TEXTURE_CUBE_MAP_ARRAY, TEXTURE_RECTANGLE, one of
 862     *    the targets from table 8.19 (for GetTexImage and GetnTexImage *only*),
 863     *    or TEXTURE_CUBE_MAP (for GetTextureImage *only*)." (Emphasis added.)
 864     */
 865    case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
 866    case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
 867    case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
 868    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
 869    case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
 870    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
 871       return dsa ? GL_FALSE : ctx->Extensions.ARB_texture_cube_map;
 872    case GL_TEXTURE_CUBE_MAP:
 873       return dsa ? GL_TRUE : GL_FALSE;
 874    default:
 875       return GL_FALSE;
 876    }
 877 }
 878
 879
 880 /**
 881  * Wrapper for _mesa_select_tex_image() which can handle target being
 882  * GL_TEXTURE_CUBE_MAP in which case we use zoffset to select a cube face.
 883  * This can happen for glGetTextureImage and glGetTextureSubImage (DSA
 884  * functions).
 885  */
 886 static struct gl_texture_image *
 887 select_tex_image(const struct gl_texture_object *texObj, GLenum target,
 888                  GLint level, GLint zoffset)
 889 {
 890    assert(level >= 0);
 891    assert(level < MAX_TEXTURE_LEVELS);
 892    if (target == GL_TEXTURE_CUBE_MAP) {
 893       assert(zoffset >= 0);
 894       assert(zoffset < 6);
 895       target = GL_TEXTURE_CUBE_MAP_POSITIVE_X + zoffset;
 896    }
 897    return _mesa_select_tex_image(texObj, target, level);
 898 }
 899
 900
 901 /**
 902  * Error-check the offset and size arguments to
 903  * glGet[Compressed]TextureSubImage().  Also checks if the specified
 904  * texture image is missing.
 905  * \return true if error, false if no error.
 906  */
 907 static bool
 908 dimensions_error_check(struct gl_context *ctx,
 909                        struct gl_texture_object *texObj,
 910                        GLenum target, GLint level,
 911                        GLint xoffset, GLint yoffset, GLint zoffset,
 912                        GLsizei width, GLsizei height, GLsizei depth,
 913                        const char *caller)
 914 {
 915    const struct gl_texture_image *texImage;
 916    int i;
 917
 918    if (xoffset < 0) {
 919       _mesa_error(ctx, GL_INVALID_VALUE, "%s(xoffset = %d)", caller, xoffset);
 920       return true;
 921    }
 922
 923    if (yoffset < 0) {
 924       _mesa_error(ctx, GL_INVALID_VALUE, "%s(yoffset = %d)", caller, yoffset);
 925       return true;
 926    }
 927
 928    if (zoffset < 0) {
 929       _mesa_error(ctx, GL_INVALID_VALUE, "%s(zoffset = %d)", caller, zoffset);
 930       return true;
 931    }
 932
 933    if (width < 0) {
 934       _mesa_error(ctx, GL_INVALID_VALUE, "%s(width = %d)", caller, width);
 935       return true;
 936    }
 937
 938    if (height < 0) {
 939       _mesa_error(ctx, GL_INVALID_VALUE, "%s(height = %d)", caller, height);
 940       return true;
 941    }
 942
 943    if (depth < 0) {
 944       _mesa_error(ctx, GL_INVALID_VALUE, "%s(depth = %d)", caller, depth);
 945       return true;
 946    }
 947
 948    /* do special per-target checks */
 949    switch (target) {
 950    case GL_TEXTURE_1D:
 951       if (yoffset != 0) {
 952          _mesa_error(ctx, GL_INVALID_VALUE,
 953                      "%s(1D, yoffset = %d)", caller, yoffset);
 954          return true;
 955       }
 956       if (height > 1) {
 957          _mesa_error(ctx, GL_INVALID_VALUE,
 958                      "%s(1D, height = %d)", caller, height);
 959          return true;
 960       }
 961       /* fall-through */
 962    case GL_TEXTURE_1D_ARRAY:
 963    case GL_TEXTURE_2D:
 964    case GL_TEXTURE_RECTANGLE:
 965       if (zoffset != 0) {
 966          _mesa_error(ctx, GL_INVALID_VALUE,
 967                      "%s(zoffset = %d)", caller, zoffset);
 968          return true;
 969       }
 970       if (depth > 1) {
 971          _mesa_error(ctx, GL_INVALID_VALUE,
 972                      "%s(depth = %d)", caller, depth);
 973          return true;
 974       }
 975       break;
 976    case GL_TEXTURE_CUBE_MAP:
 977       /* Non-array cube maps are special because we have a gl_texture_image
 978        * per face.
 979        */
 980       if (zoffset + depth > 6) {
 981          _mesa_error(ctx, GL_INVALID_VALUE,
 982                      "%s(zoffset + depth = %d)", caller, zoffset + depth);
 983          return true;
 984       }
 985       /* check that the range of faces exist */
 986       for (i = 0; i < depth; i++) {
 987          GLenum face = GL_TEXTURE_CUBE_MAP_POSITIVE_X + zoffset + i;
 988          if (!_mesa_select_tex_image(texObj, face, level)) {
 989             /* non-existant face */
 990             _mesa_error(ctx, GL_INVALID_OPERATION,
 991                         "%s(missing cube face)", caller);
 992             return true;
 993          }
 994       }
 995       break;
 996    default:
 997       ; /* nothing */
 998    }
 999
1000    texImage = select_tex_image(texObj, target, level, zoffset);
1001    if (!texImage) {
1002       /* missing texture image */
1003       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(missing image)", caller);
1004       return true;
1005    }
1006
1007    if (xoffset + width > texImage->Width) {
1008       _mesa_error(ctx, GL_INVALID_VALUE,
1009                   "%s(xoffset %d + width %d > %u)",
1010                   caller, xoffset, width, texImage->Width);
1011       return true;
1012    }
1013
1014    if (yoffset + height > texImage->Height) {
1015       _mesa_error(ctx, GL_INVALID_VALUE,
1016                   "%s(yoffset %d + height %d > %u)",
1017                   caller, yoffset, height, texImage->Height);
1018       return true;
1019    }
1020
1021    if (target != GL_TEXTURE_CUBE_MAP) {
1022       /* Cube map error checking was done above */
1023       if (zoffset + depth > texImage->Depth) {
1024          _mesa_error(ctx, GL_INVALID_VALUE,
1025                      "%s(zoffset %d + depth %d > %u)",
1026                      caller, zoffset, depth, texImage->Depth);
1027          return true;
1028       }
1029    }
1030
1031    /* Extra checks for compressed textures */
1032    {
1033       GLuint bw, bh, bd;
1034       _mesa_get_format_block_size_3d(texImage->TexFormat, &bw, &bh, &bd);
1035       if (bw > 1 || bh > 1 || bd > 1) {
1036          /* offset must be multiple of block size */
1037          if (xoffset % bw != 0) {
1038             _mesa_error(ctx, GL_INVALID_VALUE,
1039                         "%s(xoffset = %d)", caller, xoffset);
1040             return true;
1041          }
1042          if (target != GL_TEXTURE_1D && target != GL_TEXTURE_1D_ARRAY) {
1043             if (yoffset % bh != 0) {
1044                _mesa_error(ctx, GL_INVALID_VALUE,
1045                            "%s(yoffset = %d)", caller, yoffset);
1046                return true;
1047             }
1048          }
1049
1050          if (zoffset % bd != 0) {
1051             _mesa_error(ctx, GL_INVALID_VALUE,
1052                         "%s(zoffset = %d)", caller, zoffset);
1053             return true;
1054          }
1055
1056          /* The size must be a multiple of bw x bh x bd, or we must be using a
1057           * offset+size that exactly hits the edge of the image.
1058           */
1059          if ((width % bw != 0) &&
1060              (xoffset + width != (GLint) texImage->Width)) {
1061             _mesa_error(ctx, GL_INVALID_VALUE,
1062                         "%s(width = %d)", caller, width);
1063             return true;
1064          }
1065
1066          if ((height % bh != 0) &&
1067              (yoffset + height != (GLint) texImage->Height)) {
1068             _mesa_error(ctx, GL_INVALID_VALUE,
1069                         "%s(height = %d)", caller, height);
1070             return true;
1071          }
1072
1073          if ((depth % bd != 0) &&
1074              (zoffset + depth != (GLint) texImage->Depth)) {
1075             _mesa_error(ctx, GL_INVALID_VALUE,
1076                         "%s(depth = %d)", caller, depth);
1077             return true;
1078          }
1079       }
1080    }
1081
1082    if (width == 0 || height == 0 || depth == 0) {
1083       /* Not an error, but nothing to do.  Return 'true' so that the
1084        * caller simply returns.
1085        */
1086       return true;
1087    }
1088
1089    return false;
1090 }
1091
1092
1093 /**
1094  * Do PBO-related error checking for getting uncompressed images.
1095  * \return true if there was an error (or the GetTexImage is to be a no-op)
1096  */
1097 static bool
1098 pbo_error_check(struct gl_context *ctx, GLenum target,
1099                 GLsizei width, GLsizei height, GLsizei depth,
1100                 GLenum format, GLenum type, GLsizei clientMemSize,
1101                 GLvoid *pixels,
1102                 const char *caller)
1103 {
1104    const GLuint dimensions = (target == GL_TEXTURE_3D) ? 3 : 2;
1105
1106    if (!_mesa_validate_pbo_access(dimensions, &ctx->Pack, width, height, depth,
1107                                   format, type, clientMemSize, pixels)) {
1108       if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
1109          _mesa_error(ctx, GL_INVALID_OPERATION,
1110                      "%s(out of bounds PBO access)", caller);
1111       } else {
1112          _mesa_error(ctx, GL_INVALID_OPERATION,
1113                      "%s(out of bounds access: bufSize (%d) is too small)",
1114                      caller, clientMemSize);
1115       }
1116       return true;
1117    }
1118
1119    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
1120       /* PBO should not be mapped */
1121       if (_mesa_check_disallowed_mapping(ctx->Pack.BufferObj)) {
1122          _mesa_error(ctx, GL_INVALID_OPERATION,
1123                      "%s(PBO is mapped)", caller);
1124          return true;
1125       }
1126    }
1127
1128    if (!_mesa_is_bufferobj(ctx->Pack.BufferObj) && !pixels) {
1129       /* not an error, do nothing */
1130       return true;
1131    }
1132
1133    return false;
1134 }
1135
1136
1137 /**
1138  * Do error checking for all (non-compressed) get-texture-image functions.
1139  * \return true if any error, false if no errors.
1140  */
1141 static bool
1142 getteximage_error_check(struct gl_context *ctx,
1143                         struct gl_texture_object *texObj,
1144                         GLenum target, GLint level,
1145                         GLint xoffset, GLint yoffset, GLint zoffset,
1146                         GLsizei width, GLsizei height, GLsizei depth,
1147                         GLenum format, GLenum type, GLsizei bufSize,
1148                         GLvoid *pixels, const char *caller)
1149 {
1150    struct gl_texture_image *texImage;
1151    GLenum baseFormat, err;
1152    GLint maxLevels;
1153
1154    assert(texObj);
1155
1156    if (texObj->Target == 0) {
1157       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(invalid texture)", caller);
1158       return true;
1159    }
1160
1161    maxLevels = _mesa_max_texture_levels(ctx, target);
1162    if (level < 0 || level >= maxLevels) {
1163       _mesa_error(ctx, GL_INVALID_VALUE, "%s(level = %d)", caller, level);
1164       return true;
1165    }
1166
1167    err = _mesa_error_check_format_and_type(ctx, format, type);
1168    if (err != GL_NO_ERROR) {
1169       _mesa_error(ctx, err, "%s(format/type)", caller);
1170       return true;
1171    }
1172
1173    if (dimensions_error_check(ctx, texObj, target, level,
1174                               xoffset, yoffset, zoffset,
1175                               width, height, depth, caller)) {
1176       return true;
1177    }
1178
1179    if (pbo_error_check(ctx, target, width, height, depth,
1180                        format, type, bufSize, pixels, caller)) {
1181       return true;
1182    }
1183
1184    texImage = select_tex_image(texObj, target, level, zoffset);
1185    assert(texImage);
1186
1187    /*
1188     * Format and type checking has been moved up to GetnTexImage and
1189     * GetTextureImage so that it happens before getting the texImage object.
1190     */
1191
1192    baseFormat = _mesa_get_format_base_format(texImage->TexFormat);
1193
1194    /* Make sure the requested image format is compatible with the
1195     * texture's format.
1196     */
1197    if (_mesa_is_color_format(format)
1198        && !_mesa_is_color_format(baseFormat)) {
1199       _mesa_error(ctx, GL_INVALID_OPERATION,
1200                   "%s(format mismatch)", caller);
1201       return true;
1202    }
1203    else if (_mesa_is_depth_format(format)
1204             && !_mesa_is_depth_format(baseFormat)
1205             && !_mesa_is_depthstencil_format(baseFormat)) {
1206       _mesa_error(ctx, GL_INVALID_OPERATION,
1207                   "%s(format mismatch)", caller);
1208       return true;
1209    }
1210    else if (_mesa_is_stencil_format(format)
1211             && !ctx->Extensions.ARB_texture_stencil8) {
1212       _mesa_error(ctx, GL_INVALID_ENUM,
1213                   "%s(format=GL_STENCIL_INDEX)", caller);
1214       return true;
1215    }
1216    else if (_mesa_is_stencil_format(format)
1217             && !_mesa_is_depthstencil_format(baseFormat)
1218             && !_mesa_is_stencil_format(baseFormat)) {
1219       _mesa_error(ctx, GL_INVALID_OPERATION,
1220                   "%s(format mismatch)", caller);
1221       return true;
1222    }
1223    else if (_mesa_is_ycbcr_format(format)
1224             && !_mesa_is_ycbcr_format(baseFormat)) {
1225       _mesa_error(ctx, GL_INVALID_OPERATION,
1226                   "%s(format mismatch)", caller);
1227       return true;
1228    }
1229    else if (_mesa_is_depthstencil_format(format)
1230             && !_mesa_is_depthstencil_format(baseFormat)) {
1231       _mesa_error(ctx, GL_INVALID_OPERATION,
1232                   "%s(format mismatch)", caller);
1233       return true;
1234    }
1235    else if (!_mesa_is_stencil_format(format) &&
1236             _mesa_is_enum_format_integer(format) !=
1237             _mesa_is_format_integer(texImage->TexFormat)) {
1238       _mesa_error(ctx, GL_INVALID_OPERATION,
1239                   "%s(format mismatch)", caller);
1240       return true;
1241    }
1242
1243    return false;
1244 }
1245
1246
1247 /**
1248  * Return the width, height and depth of a texture image.
1249  * This function must be resilient to bad parameter values since
1250  * this is called before full error checking.
1251  */
1252 static void
1253 get_texture_image_dims(const struct gl_texture_object *texObj,
1254                        GLenum target, GLint level,
1255                        GLsizei *width, GLsizei *height, GLsizei *depth)
1256 {
1257    const struct gl_texture_image *texImage = NULL;
1258
1259    if (level >= 0 && level < MAX_TEXTURE_LEVELS) {
1260       texImage = _mesa_select_tex_image(texObj, target, level);
1261    }
1262
1263    if (texImage) {
1264       *width = texImage->Width;
1265       *height = texImage->Height;
1266       if (target == GL_TEXTURE_CUBE_MAP) {
1267          *depth = 6;
1268       }
1269       else {
1270          *depth = texImage->Depth;
1271       }
1272    }
1273    else {
1274       *width = *height = *depth = 0;
1275    }
1276 }
1277
1278
1279 /**
1280  * Common code for all (uncompressed) get-texture-image functions.
1281  * \param texObj  the texture object (should not be null)
1282  * \param target  user-provided target, or 0 for DSA
1283  * \param level image level.
1284  * \param format pixel data format for returned image.
1285  * \param type pixel data type for returned image.
1286  * \param bufSize size of the pixels data buffer.
1287  * \param pixels returned pixel data.
1288  * \param caller  name of calling function
1289  */
1290 static void
1291 get_texture_image(struct gl_context *ctx,
1292                   struct gl_texture_object *texObj,
1293                   GLenum target, GLint level,
1294                   GLint xoffset, GLint yoffset, GLint zoffset,
1295                   GLsizei width, GLsizei height, GLint depth,
1296                   GLenum format, GLenum type,
1297                   GLvoid *pixels, const char *caller)
1298 {
1299    struct gl_texture_image *texImage;
1300    unsigned firstFace, numFaces, i;
1301    GLint imageStride;
1302
1303    FLUSH_VERTICES(ctx, 0);
1304
1305    texImage = select_tex_image(texObj, target, level, zoffset);
1306    assert(texImage);  /* should have been error checked already */
1307
1308    if (_mesa_is_zero_size_texture(texImage)) {
1309       /* no image data to return */
1310       return;
1311    }
1312
1313    if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE)) {
1314       _mesa_debug(ctx, "%s(tex %u) format = %s, w=%d, h=%d,"
1315                   " dstFmt=0x%x, dstType=0x%x\n",
1316                   caller, texObj->Name,
1317                   _mesa_get_format_name(texImage->TexFormat),
1318                   texImage->Width, texImage->Height,
1319                   format, type);
1320    }
1321
1322    if (target == GL_TEXTURE_CUBE_MAP) {
1323       /* Compute stride between cube faces */
1324       imageStride = _mesa_image_image_stride(&ctx->Pack, width, height,
1325                                              format, type);
1326       firstFace = zoffset;
1327       numFaces = depth;
1328       zoffset = 0;
1329       depth = 1;
1330    }
1331    else {
1332       imageStride = 0;
1333       firstFace = _mesa_tex_target_to_face(target);
1334       numFaces = 1;
1335    }
1336
1337    _mesa_lock_texture(ctx, texObj);
1338
1339    for (i = 0; i < numFaces; i++) {
1340       texImage = texObj->Image[firstFace + i][level];
1341       assert(texImage);
1342
1343       ctx->Driver.GetTexSubImage(ctx, xoffset, yoffset, zoffset,
1344                                  width, height, depth,
1345                                  format, type, pixels, texImage);
1346
1347       /* next cube face */
1348       pixels = (GLubyte *) pixels + imageStride;
1349    }
1350
1351    _mesa_unlock_texture(ctx, texObj);
1352 }
1353
1354
1355 void GLAPIENTRY
1356 _mesa_GetnTexImageARB(GLenum target, GLint level, GLenum format, GLenum type,
1357                       GLsizei bufSize, GLvoid *pixels)
1358 {
1359    GET_CURRENT_CONTEXT(ctx);
1360    static const char *caller = "glGetnTexImageARB";
1361    GLsizei width, height, depth;
1362    struct gl_texture_object *texObj;
1363
1364    if (!legal_getteximage_target(ctx, target, false)) {
1365       _mesa_error(ctx, GL_INVALID_ENUM, "%s", caller);
1366       return;
1367    }
1368
1369    texObj = _mesa_get_current_tex_object(ctx, target);
1370    assert(texObj);
1371
1372    get_texture_image_dims(texObj, target, level, &width, &height, &depth);
1373
1374    if (getteximage_error_check(ctx, texObj, target, level,
1375                                0, 0, 0, width, height, depth,
1376                                format, type, bufSize, pixels, caller)) {
1377       return;
1378    }
1379
1380    get_texture_image(ctx, texObj, target, level,
1381                      0, 0, 0, width, height, depth,
1382                      format, type, pixels, caller);
1383 }
1384
1385
1386 void GLAPIENTRY
1387 _mesa_GetTexImage(GLenum target, GLint level, GLenum format, GLenum type,
1388                   GLvoid *pixels )
1389 {
1390    GET_CURRENT_CONTEXT(ctx);
1391    static const char *caller = "glGetTexImage";
1392    GLsizei width, height, depth;
1393    struct gl_texture_object *texObj;
1394
1395    if (!legal_getteximage_target(ctx, target, false)) {
1396       _mesa_error(ctx, GL_INVALID_ENUM, "%s", caller);
1397       return;
1398    }
1399
1400    texObj = _mesa_get_current_tex_object(ctx, target);
1401    assert(texObj);
1402
1403    get_texture_image_dims(texObj, target, level, &width, &height, &depth);
1404
1405    if (getteximage_error_check(ctx, texObj, target, level,
1406                                0, 0, 0, width, height, depth,
1407                                format, type, INT_MAX, pixels, caller)) {
1408       return;
1409    }
1410
1411    get_texture_image(ctx, texObj, target, level,
1412                      0, 0, 0, width, height, depth,
1413                      format, type, pixels, caller);
1414 }
1415
1416
1417 void GLAPIENTRY
1418 _mesa_GetTextureImage(GLuint texture, GLint level, GLenum format, GLenum type,
1419                       GLsizei bufSize, GLvoid *pixels)
1420 {
1421    GET_CURRENT_CONTEXT(ctx);
1422    GLsizei width, height, depth;
1423    static const char *caller = "glGetTextureImage";
1424    struct gl_texture_object *texObj =
1425       _mesa_lookup_texture_err(ctx, texture, caller);
1426
1427    if (!texObj) {
1428       return;
1429    }
1430
1431    if (!legal_getteximage_target(ctx, texObj->Target, true)) {
1432       _mesa_error(ctx, GL_INVALID_OPERATION, "%s", caller);
1433       return;
1434    }
1435
1436    get_texture_image_dims(texObj, texObj->Target, level,
1437                           &width, &height, &depth);
1438
1439    if (getteximage_error_check(ctx, texObj, texObj->Target, level,
1440                                0, 0, 0, width, height, depth,
1441                                format, type, bufSize, pixels, caller)) {
1442       return;
1443    }
1444
1445    get_texture_image(ctx, texObj, texObj->Target, level,
1446                      0, 0, 0, width, height, depth,
1447                      format, type, pixels, caller);
1448 }
1449
1450
1451 void GLAPIENTRY
1452 _mesa_GetTextureSubImage(GLuint texture, GLint level,
1453                          GLint xoffset, GLint yoffset, GLint zoffset,
1454                          GLsizei width, GLsizei height, GLsizei depth,
1455                          GLenum format, GLenum type, GLsizei bufSize,
1456                          void *pixels)
1457 {
1458    GET_CURRENT_CONTEXT(ctx);
1459    static const char *caller = "glGetTextureSubImage";
1460    struct gl_texture_object *texObj =
1461       _mesa_lookup_texture_err(ctx, texture, caller);
1462
1463    if (!texObj) {
1464       return;
1465    }
1466
1467    if (!legal_getteximage_target(ctx, texObj->Target, true)) {
1468       _mesa_error(ctx, GL_INVALID_OPERATION,
1469                   "%s(buffer/multisample texture)", caller);
1470       return;
1471    }
1472
1473    if (getteximage_error_check(ctx, texObj, texObj->Target, level,
1474                                xoffset, yoffset, zoffset, width, height, depth,
1475                                format, type, bufSize, pixels, caller)) {
1476       return;
1477    }
1478
1479    get_texture_image(ctx, texObj, texObj->Target, level,
1480                      xoffset, yoffset, zoffset, width, height, depth,
1481                      format, type, pixels, caller);
1482 }
1483
1484
1485
1486 /**
1487  * Compute the number of bytes which will be written when retrieving
1488  * a sub-region of a compressed texture.
1489  */
1490 static GLsizei
1491 packed_compressed_size(GLuint dimensions, mesa_format format,
1492                        GLsizei width, GLsizei height, GLsizei depth,
1493                        const struct gl_pixelstore_attrib *packing)
1494 {
1495    struct compressed_pixelstore st;
1496    GLsizei totalBytes;
1497
1498    _mesa_compute_compressed_pixelstore(dimensions, format,
1499                                        width, height, depth,
1500                                        packing, &st);
1501    totalBytes =
1502       (st.CopySlices - 1) * st.TotalRowsPerSlice * st.TotalBytesPerRow +
1503       st.SkipBytes +
1504       (st.CopyRowsPerSlice - 1) * st.TotalBytesPerRow +
1505       st.CopyBytesPerRow;
1506
1507    return totalBytes;
1508 }
1509
1510
1511 /**
1512  * Do error checking for getting compressed texture images.
1513  * \return true if any error, false if no errors.
1514  */
1515 static bool
1516 getcompressedteximage_error_check(struct gl_context *ctx,
1517                                   struct gl_texture_object *texObj,
1518                                   GLenum target, GLint level,
1519                                   GLint xoffset, GLint yoffset, GLint zoffset,
1520                                   GLsizei width, GLsizei height, GLsizei depth,
1521                                   GLsizei bufSize, GLvoid *pixels,
1522                                   const char *caller)
1523 {
1524    struct gl_texture_image *texImage;
1525    GLint maxLevels;
1526    GLsizei totalBytes;
1527    GLuint dimensions;
1528
1529    assert(texObj);
1530
1531    if (texObj->Target == 0) {
1532       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(invalid texture)", caller);
1533       return true;
1534    }
1535
1536    maxLevels = _mesa_max_texture_levels(ctx, target);
1537    if (level < 0 || level >= maxLevels) {
1538       _mesa_error(ctx, GL_INVALID_VALUE,
1539                   "%s(bad level = %d)", caller, level);
1540       return true;
1541    }
1542
1543    if (dimensions_error_check(ctx, texObj, target, level,
1544                               xoffset, yoffset, zoffset,
1545                               width, height, depth, caller)) {
1546       return true;
1547    }
1548
1549    texImage = select_tex_image(texObj, target, level, zoffset);
1550    assert(texImage);
1551
1552    if (!_mesa_is_format_compressed(texImage->TexFormat)) {
1553       _mesa_error(ctx, GL_INVALID_OPERATION,
1554                   "%s(texture is not compressed)", caller);
1555       return true;
1556    }
1557
1558    /* Check for invalid pixel storage modes */
1559    dimensions = _mesa_get_texture_dimensions(texObj->Target);
1560    if (!_mesa_compressed_pixel_storage_error_check(ctx, dimensions,
1561                                                    &ctx->Pack,
1562                                                    caller)) {
1563       return true;
1564    }
1565
1566    /* Compute number of bytes that may be touched in the dest buffer */
1567    totalBytes = packed_compressed_size(dimensions, texImage->TexFormat,
1568                                        width, height, depth,
1569                                        &ctx->Pack);
1570
1571    /* Do dest buffer bounds checking */
1572    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
1573       /* do bounds checking on PBO write */
1574       if ((GLubyte *) pixels + totalBytes >
1575           (GLubyte *) ctx->Pack.BufferObj->Size) {
1576          _mesa_error(ctx, GL_INVALID_OPERATION,
1577                      "%s(out of bounds PBO access)", caller);
1578          return true;
1579       }
1580
1581       /* make sure PBO is not mapped */
1582       if (_mesa_check_disallowed_mapping(ctx->Pack.BufferObj)) {
1583          _mesa_error(ctx, GL_INVALID_OPERATION, "%s(PBO is mapped)", caller);
1584          return true;
1585       }
1586    }
1587    else {
1588       /* do bounds checking on writing to client memory */
1589       if (totalBytes > bufSize) {
1590          _mesa_error(ctx, GL_INVALID_OPERATION,
1591                      "%s(out of bounds access: bufSize (%d) is too small)",
1592                      caller, bufSize);
1593          return true;
1594       }
1595    }
1596
1597    if (!_mesa_is_bufferobj(ctx->Pack.BufferObj) && !pixels) {
1598       /* not an error, but do nothing */
1599       return true;
1600    }
1601
1602    return false;
1603 }
1604
1605
1606 /**
1607  * Common helper for all glGetCompressed-teximage functions.
1608  */
1609 static void
1610 get_compressed_texture_image(struct gl_context *ctx,
1611                              struct gl_texture_object *texObj,
1612                              GLenum target, GLint level,
1613                              GLint xoffset, GLint yoffset, GLint zoffset,
1614                              GLsizei width, GLsizei height, GLint depth,
1615                              GLvoid *pixels,
1616                              const char *caller)
1617 {
1618    struct gl_texture_image *texImage;
1619    unsigned firstFace, numFaces, i, imageStride;
1620
1621    FLUSH_VERTICES(ctx, 0);
1622
1623    texImage = select_tex_image(texObj, target, level, zoffset);
1624    assert(texImage);  /* should have been error checked already */
1625
1626    if (_mesa_is_zero_size_texture(texImage))
1627       return;
1628
1629    if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE)) {
1630       _mesa_debug(ctx,
1631                   "%s(tex %u) format = %s, w=%d, h=%d\n",
1632                   caller, texObj->Name,
1633                   _mesa_get_format_name(texImage->TexFormat),
1634                   texImage->Width, texImage->Height);
1635    }
1636
1637    if (target == GL_TEXTURE_CUBE_MAP) {
1638       struct compressed_pixelstore store;
1639
1640       /* Compute image stride between cube faces */
1641       _mesa_compute_compressed_pixelstore(2, texImage->TexFormat,
1642                                           width, height, depth,
1643                                           &ctx->Pack, &store);
1644       imageStride = store.TotalBytesPerRow * store.TotalRowsPerSlice;
1645
1646       firstFace = zoffset;
1647       numFaces = depth;
1648       zoffset = 0;
1649       depth = 1;
1650    }
1651    else {
1652       imageStride = 0;
1653       firstFace = _mesa_tex_target_to_face(target);
1654       numFaces = 1;
1655    }
1656
1657    _mesa_lock_texture(ctx, texObj);
1658
1659    for (i = 0; i < numFaces; i++) {
1660       texImage = texObj->Image[firstFace + i][level];
1661       assert(texImage);
1662
1663       get_compressed_texsubimage_sw(ctx, texImage,
1664                                     xoffset, yoffset, zoffset,
1665                                     width, height, depth, pixels);
1666
1667       /* next cube face */
1668       pixels = (GLubyte *) pixels + imageStride;
1669    }
1670
1671    _mesa_unlock_texture(ctx, texObj);
1672 }
1673
1674
1675 void GLAPIENTRY
1676 _mesa_GetnCompressedTexImageARB(GLenum target, GLint level, GLsizei bufSize,
1677                                 GLvoid *pixels)
1678 {
1679    GET_CURRENT_CONTEXT(ctx);
1680    static const char *caller = "glGetnCompressedTexImageARB";
1681    GLsizei width, height, depth;
1682    struct gl_texture_object *texObj;
1683
1684    if (!legal_getteximage_target(ctx, target, false)) {
1685       _mesa_error(ctx, GL_INVALID_ENUM, "%s", caller);
1686       return;
1687    }
1688
1689    texObj = _mesa_get_current_tex_object(ctx, target);
1690    assert(texObj);
1691
1692    get_texture_image_dims(texObj, target, level, &width, &height, &depth);
1693
1694    if (getcompressedteximage_error_check(ctx, texObj, target, level,
1695                                          0, 0, 0, width, height, depth,
1696                                          INT_MAX, pixels, caller)) {
1697       return;
1698    }
1699
1700    get_compressed_texture_image(ctx, texObj, target, level,
1701                                 0, 0, 0, width, height, depth,
1702                                 pixels, caller);
1703 }
1704
1705
1706 void GLAPIENTRY
1707 _mesa_GetCompressedTexImage(GLenum target, GLint level, GLvoid *pixels)
1708 {
1709    GET_CURRENT_CONTEXT(ctx);
1710    static const char *caller = "glGetCompressedTexImage";
1711    GLsizei width, height, depth;
1712    struct gl_texture_object *texObj;
1713
1714    if (!legal_getteximage_target(ctx, target, false)) {
1715       _mesa_error(ctx, GL_INVALID_ENUM, "%s", caller);
1716       return;
1717    }
1718
1719    texObj = _mesa_get_current_tex_object(ctx, target);
1720    assert(texObj);
1721
1722    get_texture_image_dims(texObj, target, level,
1723                           &width, &height, &depth);
1724
1725    if (getcompressedteximage_error_check(ctx, texObj, target, level,
1726                                          0, 0, 0, width, height, depth,
1727                                          INT_MAX, pixels, caller)) {
1728       return;
1729    }
1730
1731    get_compressed_texture_image(ctx, texObj, target, level,
1732                                 0, 0, 0, width, height, depth,
1733                                 pixels, caller);
1734 }
1735
1736
1737 void GLAPIENTRY
1738 _mesa_GetCompressedTextureImage(GLuint texture, GLint level,
1739                                 GLsizei bufSize, GLvoid *pixels)
1740 {
1741    GET_CURRENT_CONTEXT(ctx);
1742    static const char *caller = "glGetCompressedTextureImage";
1743    GLsizei width, height, depth;
1744    struct gl_texture_object *texObj =
1745       _mesa_lookup_texture_err(ctx, texture, caller);
1746
1747    if (!texObj) {
1748       return;
1749    }
1750
1751    get_texture_image_dims(texObj, texObj->Target, level,
1752                           &width, &height, &depth);
1753
1754    if (getcompressedteximage_error_check(ctx, texObj, texObj->Target, level,
1755                                          0, 0, 0, width, height, depth,
1756                                          bufSize, pixels, caller)) {
1757       return;
1758    }
1759
1760    get_compressed_texture_image(ctx, texObj, texObj->Target, level,
1761                                 0, 0, 0, width, height, depth,
1762                                 pixels, caller);
1763 }
1764
1765
1766 void APIENTRY
1767 _mesa_GetCompressedTextureSubImage(GLuint texture, GLint level,
1768                                    GLint xoffset, GLint yoffset,
1769                                    GLint zoffset, GLsizei width,
1770                                    GLsizei height, GLsizei depth,
1771                                    GLsizei bufSize, void *pixels)
1772 {
1773    GET_CURRENT_CONTEXT(ctx);
1774    static const char *caller = "glGetCompressedTextureImage";
1775    struct gl_texture_object *texObj = NULL;
1776
1777    texObj = _mesa_lookup_texture_err(ctx, texture, caller);
1778    if (!texObj) {
1779       return;
1780    }
1781
1782    if (getcompressedteximage_error_check(ctx, texObj, texObj->Target, level,
1783                                          xoffset, yoffset, zoffset,
1784                                          width, height, depth,
1785                                          bufSize, pixels, caller)) {
1786       return;
1787    }
1788
1789    get_compressed_texture_image(ctx, texObj, texObj->Target, level,
1790                                 xoffset, yoffset, zoffset,
1791                                 width, height, depth,
1792                                 pixels, caller);
1793 }