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