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 "texcompress.h"
  44 #include "texgetimage.h"
  45 #include "teximage.h"
  46
  47
  48
  49 /**
  50  * Can the given type represent negative values?
  51  */
  52 static inline GLboolean
  53 type_needs_clamping(GLenum type)
  54 {
  55    switch (type) {
  56    case GL_BYTE:
  57    case GL_SHORT:
  58    case GL_INT:
  59    case GL_FLOAT:
  60    case GL_HALF_FLOAT_ARB:
  61    case GL_UNSIGNED_INT_10F_11F_11F_REV:
  62    case GL_UNSIGNED_INT_5_9_9_9_REV:
  63       return GL_FALSE;
  64    default:
  65       return GL_TRUE;
  66    }
  67 }
  68
  69
  70 /**
  71  * glGetTexImage for depth/Z pixels.
  72  */
  73 static void
  74 get_tex_depth(struct gl_context *ctx, GLuint dimensions,
  75               GLenum format, GLenum type, GLvoid *pixels,
  76               struct gl_texture_image *texImage)
  77 {
  78    const GLint width = texImage->Width;
  79    const GLint height = texImage->Height;
  80    const GLint depth = texImage->Depth;
  81    GLint img, row;
  82    GLfloat *depthRow = malloc(width * sizeof(GLfloat));
  83
  84    if (!depthRow) {
  85       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
  86       return;
  87    }
  88
  89    for (img = 0; img < depth; img++) {
  90       GLubyte *srcMap;
  91       GLint srcRowStride;
  92
  93       /* map src texture buffer */
  94       ctx->Driver.MapTextureImage(ctx, texImage, img,
  95                                   0, 0, width, height, GL_MAP_READ_BIT,
  96                                   &srcMap, &srcRowStride);
  97
  98       if (srcMap) {
  99          for (row = 0; row < height; row++) {
 100             void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 101                                              width, height, format, type,
 102                                              img, row, 0);
 103             const GLubyte *src = srcMap + row * srcRowStride;
 104             _mesa_unpack_float_z_row(texImage->TexFormat, width, src, depthRow);
 105             _mesa_pack_depth_span(ctx, width, dest, type, depthRow, &ctx->Pack);
 106          }
 107
 108          ctx->Driver.UnmapTextureImage(ctx, texImage, img);
 109       }
 110       else {
 111          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 112          break;
 113       }
 114    }
 115
 116    free(depthRow);
 117 }
 118
 119
 120 /**
 121  * glGetTexImage for depth/stencil pixels.
 122  */
 123 static void
 124 get_tex_depth_stencil(struct gl_context *ctx, GLuint dimensions,
 125                       GLenum format, GLenum type, GLvoid *pixels,
 126                       struct gl_texture_image *texImage)
 127 {
 128    const GLint width = texImage->Width;
 129    const GLint height = texImage->Height;
 130    const GLint depth = texImage->Depth;
 131    GLint img, row;
 132
 133    assert(format == GL_DEPTH_STENCIL);
 134    assert(type == GL_UNSIGNED_INT_24_8);
 135    /* XXX type == GL_FLOAT_32_UNSIGNED_INT_24_8_REV is not handled yet */
 136
 137    for (img = 0; img < depth; img++) {
 138       GLubyte *srcMap;
 139       GLint rowstride;
 140
 141       /* map src texture buffer */
 142       ctx->Driver.MapTextureImage(ctx, texImage, img,
 143                                   0, 0, width, height, GL_MAP_READ_BIT,
 144                                   &srcMap, &rowstride);
 145
 146       if (srcMap) {
 147          for (row = 0; row < height; row++) {
 148             const GLubyte *src = srcMap + row * rowstride;
 149             void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 150                                              width, height, format, type,
 151                                              img, row, 0);
 152             /* Unpack from texture's format to GL's z24_s8 layout */
 153             _mesa_unpack_uint_24_8_depth_stencil_row(texImage->TexFormat,
 154                                                      width,
 155                                                      (const GLuint *) src,
 156                                                      dest);
 157             if (ctx->Pack.SwapBytes) {
 158                _mesa_swap4((GLuint *) dest, width);
 159             }
 160          }
 161
 162          ctx->Driver.UnmapTextureImage(ctx, texImage, img);
 163       }
 164       else {
 165          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 166          break;
 167       }
 168    }
 169 }
 170
 171
 172 /**
 173  * glGetTexImage for YCbCr pixels.
 174  */
 175 static void
 176 get_tex_ycbcr(struct gl_context *ctx, GLuint dimensions,
 177               GLenum format, GLenum type, GLvoid *pixels,
 178               struct gl_texture_image *texImage)
 179 {
 180    const GLint width = texImage->Width;
 181    const GLint height = texImage->Height;
 182    const GLint depth = texImage->Depth;
 183    GLint img, row;
 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, img,
 191                                   0, 0, width, height, GL_MAP_READ_BIT,
 192                                   &srcMap, &rowstride);
 193
 194       if (srcMap) {
 195          for (row = 0; row < height; row++) {
 196             const GLubyte *src = srcMap + row * rowstride;
 197             void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 198                                              width, height, format, type,
 199                                              img, row, 0);
 200             memcpy(dest, src, width * sizeof(GLushort));
 201
 202             /* check for byte swapping */
 203             if ((texImage->TexFormat == MESA_FORMAT_YCBCR
 204                  && type == GL_UNSIGNED_SHORT_8_8_REV_MESA) ||
 205                 (texImage->TexFormat == MESA_FORMAT_YCBCR_REV
 206                  && type == GL_UNSIGNED_SHORT_8_8_MESA)) {
 207                if (!ctx->Pack.SwapBytes)
 208                   _mesa_swap2((GLushort *) dest, width);
 209             }
 210             else if (ctx->Pack.SwapBytes) {
 211                _mesa_swap2((GLushort *) dest, width);
 212             }
 213          }
 214
 215          ctx->Driver.UnmapTextureImage(ctx, texImage, img);
 216       }
 217       else {
 218          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 219          break;
 220       }
 221    }
 222 }
 223
 224
 225 /**
 226  * Get a color texture image with decompression.
 227  */
 228 static void
 229 get_tex_rgba_compressed(struct gl_context *ctx, GLuint dimensions,
 230                         GLenum format, GLenum type, GLvoid *pixels,
 231                         struct gl_texture_image *texImage,
 232                         GLbitfield transferOps)
 233 {
 234    /* don't want to apply sRGB -> RGB conversion here so override the format */
 235    const mesa_format texFormat =
 236       _mesa_get_srgb_format_linear(texImage->TexFormat);
 237    const GLenum baseFormat = _mesa_get_format_base_format(texFormat);
 238    const GLenum destBaseFormat = _mesa_base_tex_format(ctx, format);
 239    GLenum rebaseFormat = GL_NONE;
 240    const GLuint width = texImage->Width;
 241    const GLuint height = texImage->Height;
 242    const GLuint depth = texImage->Depth;
 243    GLfloat *tempImage, *tempSlice, *srcRow;
 244    GLuint row, slice;
 245
 246    /* Decompress into temp float buffer, then pack into user buffer */
 247    tempImage = malloc(width * height * depth
 248                                   * 4 * sizeof(GLfloat));
 249    if (!tempImage) {
 250       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage()");
 251       return;
 252    }
 253
 254    /* Decompress the texture image slices - results in 'tempImage' */
 255    for (slice = 0; slice < depth; slice++) {
 256       GLubyte *srcMap;
 257       GLint srcRowStride;
 258
 259       tempSlice = tempImage + slice * 4 * width * height;
 260
 261       ctx->Driver.MapTextureImage(ctx, texImage, slice,
 262                                   0, 0, width, height,
 263                                   GL_MAP_READ_BIT,
 264                                   &srcMap, &srcRowStride);
 265       if (srcMap) {
 266          _mesa_decompress_image(texFormat, width, height,
 267                                 srcMap, srcRowStride, tempSlice);
 268
 269          ctx->Driver.UnmapTextureImage(ctx, texImage, slice);
 270       }
 271       else {
 272          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 273          free(tempImage);
 274          return;
 275       }
 276    }
 277
 278    if (baseFormat == GL_LUMINANCE ||
 279        baseFormat == GL_INTENSITY ||
 280        baseFormat == GL_LUMINANCE_ALPHA) {
 281       /* If a luminance (or intensity) texture is read back as RGB(A), the
 282        * returned value should be (L,0,0,1), not (L,L,L,1).  Set rebaseFormat
 283        * here to get G=B=0.
 284        */
 285       rebaseFormat = texImage->_BaseFormat;
 286    }
 287    else if ((baseFormat == GL_RGBA ||
 288              baseFormat == GL_RGB  ||
 289              baseFormat == GL_RG) &&
 290             (destBaseFormat == GL_LUMINANCE ||
 291              destBaseFormat == GL_LUMINANCE_ALPHA ||
 292              destBaseFormat == GL_LUMINANCE_INTEGER_EXT ||
 293              destBaseFormat == GL_LUMINANCE_ALPHA_INTEGER_EXT)) {
 294       /* If we're reading back an RGB(A) texture as luminance then we need
 295        * to return L=tex(R).  Note, that's different from glReadPixels which
 296        * returns L=R+G+B.
 297        */
 298       rebaseFormat = GL_LUMINANCE_ALPHA; /* this covers GL_LUMINANCE too */
 299    }
 300
 301    if (rebaseFormat) {
 302       _mesa_rebase_rgba_float(width * height, (GLfloat (*)[4]) tempImage,
 303                               rebaseFormat);
 304    }
 305
 306    tempSlice = tempImage;
 307    for (slice = 0; slice < depth; slice++) {
 308       srcRow = tempSlice;
 309       for (row = 0; row < height; row++) {
 310          void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 311                                           width, height, format, type,
 312                                           slice, row, 0);
 313
 314          _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) srcRow,
 315                                     format, type, dest, &ctx->Pack, transferOps);
 316          srcRow += 4 * width;
 317       }
 318       tempSlice += 4 * width * height;
 319    }
 320
 321    free(tempImage);
 322 }
 323
 324
 325 /**
 326  * Return a base GL format given the user-requested format
 327  * for glGetTexImage().
 328  */
 329 GLenum
 330 _mesa_base_pack_format(GLenum format)
 331 {
 332    switch (format) {
 333    case GL_ABGR_EXT:
 334    case GL_BGRA:
 335    case GL_BGRA_INTEGER:
 336    case GL_RGBA_INTEGER:
 337       return GL_RGBA;
 338    case GL_BGR:
 339    case GL_BGR_INTEGER:
 340    case GL_RGB_INTEGER:
 341       return GL_RGB;
 342    case GL_RED_INTEGER:
 343       return GL_RED;
 344    case GL_GREEN_INTEGER:
 345       return GL_GREEN;
 346    case GL_BLUE_INTEGER:
 347       return GL_BLUE;
 348    case GL_ALPHA_INTEGER:
 349       return GL_ALPHA;
 350    case GL_LUMINANCE_INTEGER_EXT:
 351       return GL_LUMINANCE;
 352    case GL_LUMINANCE_ALPHA_INTEGER_EXT:
 353       return GL_LUMINANCE_ALPHA;
 354    default:
 355       return format;
 356    }
 357 }
 358
 359
 360 /**
 361  * Get an uncompressed color texture image.
 362  */
 363 static void
 364 get_tex_rgba_uncompressed(struct gl_context *ctx, GLuint dimensions,
 365                           GLenum format, GLenum type, GLvoid *pixels,
 366                           struct gl_texture_image *texImage,
 367                           GLbitfield transferOps)
 368 {
 369    /* don't want to apply sRGB -> RGB conversion here so override the format */
 370    const mesa_format texFormat =
 371       _mesa_get_srgb_format_linear(texImage->TexFormat);
 372    const GLuint width = texImage->Width;
 373    GLenum destBaseFormat = _mesa_base_pack_format(format);
 374    GLenum rebaseFormat = GL_NONE;
 375    GLuint height = texImage->Height;
 376    GLuint depth = texImage->Depth;
 377    GLuint img, row;
 378    GLfloat (*rgba)[4];
 379    GLuint (*rgba_uint)[4];
 380    GLboolean tex_is_integer = _mesa_is_format_integer_color(texImage->TexFormat);
 381    GLboolean tex_is_uint = _mesa_is_format_unsigned(texImage->TexFormat);
 382    GLenum texBaseFormat = _mesa_get_format_base_format(texImage->TexFormat);
 383
 384    /* Allocate buffer for one row of texels */
 385    rgba = malloc(4 * width * sizeof(GLfloat));
 386    rgba_uint = (GLuint (*)[4]) rgba;
 387    if (!rgba) {
 388       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage()");
 389       return;
 390    }
 391
 392    if (texImage->TexObject->Target == GL_TEXTURE_1D_ARRAY) {
 393       depth = height;
 394       height = 1;
 395    }
 396
 397    if (texImage->_BaseFormat == GL_LUMINANCE ||
 398        texImage->_BaseFormat == GL_INTENSITY ||
 399        texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {
 400       /* If a luminance (or intensity) texture is read back as RGB(A), the
 401        * returned value should be (L,0,0,1), not (L,L,L,1).  Set rebaseFormat
 402        * here to get G=B=0.
 403        */
 404       rebaseFormat = texImage->_BaseFormat;
 405    }
 406    else if ((texImage->_BaseFormat == GL_RGBA ||
 407              texImage->_BaseFormat == GL_RGB ||
 408              texImage->_BaseFormat == GL_RG) &&
 409             (destBaseFormat == GL_LUMINANCE ||
 410              destBaseFormat == GL_LUMINANCE_ALPHA ||
 411              destBaseFormat == GL_LUMINANCE_INTEGER_EXT ||
 412              destBaseFormat == GL_LUMINANCE_ALPHA_INTEGER_EXT)) {
 413       /* If we're reading back an RGB(A) texture as luminance then we need
 414        * to return L=tex(R).  Note, that's different from glReadPixels which
 415        * returns L=R+G+B.
 416        */
 417       rebaseFormat = GL_LUMINANCE_ALPHA; /* this covers GL_LUMINANCE too */
 418    }
 419    else if (texImage->_BaseFormat != texBaseFormat) {
 420       /* The internal format and the real format differ, so we can't rely
 421        * on the unpack functions setting the correct constant values.
 422        * (e.g. reading back GL_RGB8 which is actually RGBA won't set alpha=1)
 423        */
 424       switch (texImage->_BaseFormat) {
 425       case GL_RED:
 426          if ((texBaseFormat == GL_RGBA ||
 427               texBaseFormat == GL_RGB ||
 428               texBaseFormat == GL_RG) &&
 429              (destBaseFormat == GL_RGBA ||
 430               destBaseFormat == GL_RGB ||
 431               destBaseFormat == GL_RG ||
 432               destBaseFormat == GL_GREEN)) {
 433             rebaseFormat = texImage->_BaseFormat;
 434             break;
 435          }
 436          /* fall through */
 437       case GL_RG:
 438          if ((texBaseFormat == GL_RGBA ||
 439               texBaseFormat == GL_RGB) &&
 440              (destBaseFormat == GL_RGBA ||
 441               destBaseFormat == GL_RGB ||
 442               destBaseFormat == GL_BLUE)) {
 443             rebaseFormat = texImage->_BaseFormat;
 444             break;
 445          }
 446          /* fall through */
 447       case GL_RGB:
 448          if (texBaseFormat == GL_RGBA &&
 449              (destBaseFormat == GL_RGBA ||
 450               destBaseFormat == GL_ALPHA ||
 451               destBaseFormat == GL_LUMINANCE_ALPHA)) {
 452             rebaseFormat = texImage->_BaseFormat;
 453          }
 454          break;
 455
 456       case GL_ALPHA:
 457          if (destBaseFormat != GL_ALPHA) {
 458             rebaseFormat = texImage->_BaseFormat;
 459          }
 460          break;
 461       }
 462    }
 463
 464    for (img = 0; img < depth; img++) {
 465       GLubyte *srcMap;
 466       GLint rowstride;
 467
 468       /* map src texture buffer */
 469       ctx->Driver.MapTextureImage(ctx, texImage, img,
 470                                   0, 0, width, height, GL_MAP_READ_BIT,
 471                                   &srcMap, &rowstride);
 472       if (srcMap) {
 473          for (row = 0; row < height; row++) {
 474             const GLubyte *src = srcMap + row * rowstride;
 475             void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 476                                              width, height, format, type,
 477                                              img, row, 0);
 478
 479             if (tex_is_integer) {
 480                _mesa_unpack_uint_rgba_row(texFormat, width, src, rgba_uint);
 481                if (rebaseFormat)
 482                   _mesa_rebase_rgba_uint(width, rgba_uint, rebaseFormat);
 483                if (tex_is_uint) {
 484                   _mesa_pack_rgba_span_from_uints(ctx, width,
 485                                                   (GLuint (*)[4]) rgba_uint,
 486                                                   format, type, dest);
 487                } else {
 488                   _mesa_pack_rgba_span_from_ints(ctx, width,
 489                                                  (GLint (*)[4]) rgba_uint,
 490                                                  format, type, dest);
 491                }
 492             } else {
 493                _mesa_unpack_rgba_row(texFormat, width, src, rgba);
 494                if (rebaseFormat)
 495                   _mesa_rebase_rgba_float(width, rgba, rebaseFormat);
 496                _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,
 497                                           format, type, dest,
 498                                           &ctx->Pack, transferOps);
 499             }
 500          }
 501
 502          /* Unmap the src texture buffer */
 503          ctx->Driver.UnmapTextureImage(ctx, texImage, img);
 504       }
 505       else {
 506          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 507          break;
 508       }
 509    }
 510
 511    free(rgba);
 512 }
 513
 514
 515 /**
 516  * glGetTexImage for color formats (RGBA, RGB, alpha, LA, etc).
 517  * Compressed textures are handled here as well.
 518  */
 519 static void
 520 get_tex_rgba(struct gl_context *ctx, GLuint dimensions,
 521              GLenum format, GLenum type, GLvoid *pixels,
 522              struct gl_texture_image *texImage)
 523 {
 524    const GLenum dataType = _mesa_get_format_datatype(texImage->TexFormat);
 525    GLbitfield transferOps = 0x0;
 526
 527    /* In general, clamping does not apply to glGetTexImage, except when
 528     * the returned type of the image can't hold negative values.
 529     */
 530    if (type_needs_clamping(type)) {
 531       /* the returned image type can't have negative values */
 532       if (dataType == GL_FLOAT ||
 533           dataType == GL_HALF_FLOAT ||
 534           dataType == GL_SIGNED_NORMALIZED ||
 535           format == GL_LUMINANCE ||
 536           format == GL_LUMINANCE_ALPHA) {
 537          transferOps |= IMAGE_CLAMP_BIT;
 538       }
 539    }
 540
 541    if (_mesa_is_format_compressed(texImage->TexFormat)) {
 542       get_tex_rgba_compressed(ctx, dimensions, format, type,
 543                               pixels, texImage, transferOps);
 544    }
 545    else {
 546       get_tex_rgba_uncompressed(ctx, dimensions, format, type,
 547                                 pixels, texImage, transferOps);
 548    }
 549 }
 550
 551
 552 /**
 553  * Try to do glGetTexImage() with simple memcpy().
 554  * \return GL_TRUE if done, GL_FALSE otherwise
 555  */
 556 static GLboolean
 557 get_tex_memcpy(struct gl_context *ctx, GLenum format, GLenum type,
 558                GLvoid *pixels,
 559                struct gl_texture_image *texImage)
 560 {
 561    const GLenum target = texImage->TexObject->Target;
 562    GLboolean memCopy = GL_FALSE;
 563    GLenum texBaseFormat = _mesa_get_format_base_format(texImage->TexFormat);
 564
 565    /*
 566     * Check if we can use memcpy to copy from the hardware texture
 567     * format to the user's format/type.
 568     * Note that GL's pixel transfer ops don't apply to glGetTexImage()
 569     */
 570    if ((target == GL_TEXTURE_1D ||
 571         target == GL_TEXTURE_2D ||
 572         target == GL_TEXTURE_RECTANGLE ||
 573         _mesa_is_cube_face(target)) &&
 574        texBaseFormat == texImage->_BaseFormat) {
 575       memCopy = _mesa_format_matches_format_and_type(texImage->TexFormat,
 576                                                      format, type,
 577                                                      ctx->Pack.SwapBytes);
 578    }
 579
 580    if (memCopy) {
 581       const GLuint bpp = _mesa_get_format_bytes(texImage->TexFormat);
 582       const GLuint bytesPerRow = texImage->Width * bpp;
 583       GLubyte *dst =
 584          _mesa_image_address2d(&ctx->Pack, pixels, texImage->Width,
 585                                texImage->Height, format, type, 0, 0);
 586       const GLint dstRowStride =
 587          _mesa_image_row_stride(&ctx->Pack, texImage->Width, format, type);
 588       GLubyte *src;
 589       GLint srcRowStride;
 590
 591       /* map src texture buffer */
 592       ctx->Driver.MapTextureImage(ctx, texImage, 0,
 593                                   0, 0, texImage->Width, texImage->Height,
 594                                   GL_MAP_READ_BIT, &src, &srcRowStride);
 595
 596       if (src) {
 597          if (bytesPerRow == dstRowStride && bytesPerRow == srcRowStride) {
 598             memcpy(dst, src, bytesPerRow * texImage->Height);
 599          }
 600          else {
 601             GLuint row;
 602             for (row = 0; row < texImage->Height; row++) {
 603                memcpy(dst, src, bytesPerRow);
 604                dst += dstRowStride;
 605                src += srcRowStride;
 606             }
 607          }
 608
 609          /* unmap src texture buffer */
 610          ctx->Driver.UnmapTextureImage(ctx, texImage, 0);
 611       }
 612       else {
 613          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 614       }
 615    }
 616
 617    return memCopy;
 618 }
 619
 620
 621 /**
 622  * This is the software fallback for Driver.GetTexImage().
 623  * All error checking will have been done before this routine is called.
 624  * We'll call ctx->Driver.MapTextureImage() to access the data, then
 625  * unmap with ctx->Driver.UnmapTextureImage().
 626  */
 627 void
 628 _mesa_get_teximage(struct gl_context *ctx,
 629                    GLenum format, GLenum type, GLvoid *pixels,
 630                    struct gl_texture_image *texImage)
 631 {
 632    const GLuint dimensions =
 633       _mesa_get_texture_dimensions(texImage->TexObject->Target);
 634
 635    /* map dest buffer, if PBO */
 636    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 637       /* Packing texture image into a PBO.
 638        * Map the (potentially) VRAM-based buffer into our process space so
 639        * we can write into it with the code below.
 640        * A hardware driver might use a sophisticated blit to move the
 641        * texture data to the PBO if the PBO is in VRAM along with the texture.
 642        */
 643       GLubyte *buf = (GLubyte *)
 644          ctx->Driver.MapBufferRange(ctx, 0, ctx->Pack.BufferObj->Size,
 645                                     GL_MAP_WRITE_BIT, ctx->Pack.BufferObj,
 646                                     MAP_INTERNAL);
 647       if (!buf) {
 648          /* out of memory or other unexpected error */
 649          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage(map PBO failed)");
 650          return;
 651       }
 652       /* <pixels> was an offset into the PBO.
 653        * Now make it a real, client-side pointer inside the mapped region.
 654        */
 655       pixels = ADD_POINTERS(buf, pixels);
 656    }
 657
 658    if (get_tex_memcpy(ctx, format, type, pixels, texImage)) {
 659       /* all done */
 660    }
 661    else if (format == GL_DEPTH_COMPONENT) {
 662       get_tex_depth(ctx, dimensions, format, type, pixels, texImage);
 663    }
 664    else if (format == GL_DEPTH_STENCIL_EXT) {
 665       get_tex_depth_stencil(ctx, dimensions, format, type, pixels, texImage);
 666    }
 667    else if (format == GL_YCBCR_MESA) {
 668       get_tex_ycbcr(ctx, dimensions, format, type, pixels, texImage);
 669    }
 670    else {
 671       get_tex_rgba(ctx, dimensions, format, type, pixels, texImage);
 672    }
 673
 674    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 675       ctx->Driver.UnmapBuffer(ctx, ctx->Pack.BufferObj, MAP_INTERNAL);
 676    }
 677 }
 678
 679
 680
 681 /**
 682  * This is the software fallback for Driver.GetCompressedTexImage().
 683  * All error checking will have been done before this routine is called.
 684  */
 685 void
 686 _mesa_get_compressed_teximage(struct gl_context *ctx,
 687                               struct gl_texture_image *texImage,
 688                               GLvoid *img)
 689 {
 690    const GLuint row_stride =
 691       _mesa_format_row_stride(texImage->TexFormat, texImage->Width);
 692    GLuint i;
 693    GLubyte *src;
 694    GLint srcRowStride;
 695
 696    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 697       /* pack texture image into a PBO */
 698       GLubyte *buf = (GLubyte *)
 699          ctx->Driver.MapBufferRange(ctx, 0, ctx->Pack.BufferObj->Size,
 700                                     GL_MAP_WRITE_BIT, ctx->Pack.BufferObj,
 701                                     MAP_INTERNAL);
 702       if (!buf) {
 703          /* out of memory or other unexpected error */
 704          _mesa_error(ctx, GL_OUT_OF_MEMORY,
 705                      "glGetCompresssedTexImage(map PBO failed)");
 706          return;
 707       }
 708       img = ADD_POINTERS(buf, img);
 709    }
 710
 711    /* map src texture buffer */
 712    ctx->Driver.MapTextureImage(ctx, texImage, 0,
 713                                0, 0, texImage->Width, texImage->Height,
 714                                GL_MAP_READ_BIT, &src, &srcRowStride);
 715
 716    if (src) {
 717       /* no pixelstore or pixel transfer, but respect stride */
 718
 719       if (row_stride == srcRowStride) {
 720          const GLuint size = _mesa_format_image_size(texImage->TexFormat,
 721                                                      texImage->Width,
 722                                                      texImage->Height,
 723                                                      texImage->Depth);
 724          memcpy(img, src, size);
 725       }
 726       else {
 727          GLuint bw, bh;
 728          _mesa_get_format_block_size(texImage->TexFormat, &bw, &bh);
 729          for (i = 0; i < (texImage->Height + bh - 1) / bh; i++) {
 730             memcpy((GLubyte *)img + i * row_stride,
 731                    (GLubyte *)src + i * srcRowStride,
 732                    row_stride);
 733          }
 734       }
 735
 736       ctx->Driver.UnmapTextureImage(ctx, texImage, 0);
 737    }
 738    else {
 739       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetCompresssedTexImage");
 740    }
 741
 742    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 743       ctx->Driver.UnmapBuffer(ctx, ctx->Pack.BufferObj, MAP_INTERNAL);
 744    }
 745 }
 746
 747
 748 /**
 749  * Validate the texture target enum supplied to glTexImage or
 750  * glCompressedTexImage.
 751  */
 752 static GLboolean
 753 legal_getteximage_target(struct gl_context *ctx, GLenum target)
 754 {
 755    switch (target) {
 756    case GL_TEXTURE_1D:
 757    case GL_TEXTURE_2D:
 758    case GL_TEXTURE_3D:
 759       return GL_TRUE;
 760    case GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB:
 761    case GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB:
 762    case GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB:
 763    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB:
 764    case GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB:
 765    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB:
 766       return ctx->Extensions.ARB_texture_cube_map;
 767    case GL_TEXTURE_RECTANGLE_NV:
 768       return ctx->Extensions.NV_texture_rectangle;
 769    case GL_TEXTURE_1D_ARRAY_EXT:
 770    case GL_TEXTURE_2D_ARRAY_EXT:
 771       return ctx->Extensions.EXT_texture_array;
 772    case GL_TEXTURE_CUBE_MAP_ARRAY:
 773       return ctx->Extensions.ARB_texture_cube_map_array;
 774    default:
 775       return GL_FALSE;
 776    }
 777 }
 778
 779
 780 /**
 781  * Do error checking for a glGetTexImage() call.
 782  * \return GL_TRUE if any error, GL_FALSE if no errors.
 783  */
 784 static GLboolean
 785 getteximage_error_check(struct gl_context *ctx, GLenum target, GLint level,
 786                         GLenum format, GLenum type, GLsizei clientMemSize,
 787                         GLvoid *pixels )
 788 {
 789    struct gl_texture_object *texObj;
 790    struct gl_texture_image *texImage;
 791    const GLint maxLevels = _mesa_max_texture_levels(ctx, target);
 792    const GLuint dimensions = (target == GL_TEXTURE_3D) ? 3 : 2;
 793    GLenum baseFormat, err;
 794
 795    if (!legal_getteximage_target(ctx, target)) {
 796       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(target=0x%x)", target);
 797       return GL_TRUE;
 798    }
 799
 800    assert(maxLevels != 0);
 801    if (level < 0 || level >= maxLevels) {
 802       _mesa_error( ctx, GL_INVALID_VALUE, "glGetTexImage(level)" );
 803       return GL_TRUE;
 804    }
 805
 806    err = _mesa_error_check_format_and_type(ctx, format, type);
 807    if (err != GL_NO_ERROR) {
 808       _mesa_error(ctx, err, "glGetTexImage(format/type)");
 809       return GL_TRUE;
 810    }
 811
 812    texObj = _mesa_get_current_tex_object(ctx, target);
 813
 814    if (!texObj) {
 815       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(target)");
 816       return GL_TRUE;
 817    }
 818
 819    texImage = _mesa_select_tex_image(ctx, texObj, target, level);
 820    if (!texImage) {
 821       /* non-existant texture image */
 822       return GL_TRUE;
 823    }
 824
 825    baseFormat = _mesa_get_format_base_format(texImage->TexFormat);
 826
 827    /* Make sure the requested image format is compatible with the
 828     * texture's format.
 829     */
 830    if (_mesa_is_color_format(format)
 831        && !_mesa_is_color_format(baseFormat)) {
 832       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
 833       return GL_TRUE;
 834    }
 835    else if (_mesa_is_depth_format(format)
 836             && !_mesa_is_depth_format(baseFormat)
 837             && !_mesa_is_depthstencil_format(baseFormat)) {
 838       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
 839       return GL_TRUE;
 840    }
 841    else if (_mesa_is_stencil_format(format)
 842             && !ctx->Extensions.ARB_texture_stencil8) {
 843       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format=GL_STENCIL_INDEX)");
 844       return GL_TRUE;
 845    }
 846    else if (_mesa_is_ycbcr_format(format)
 847             && !_mesa_is_ycbcr_format(baseFormat)) {
 848       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
 849       return GL_TRUE;
 850    }
 851    else if (_mesa_is_depthstencil_format(format)
 852             && !_mesa_is_depthstencil_format(baseFormat)) {
 853       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
 854       return GL_TRUE;
 855    }
 856    else if (_mesa_is_dudv_format(format)
 857             && !_mesa_is_dudv_format(baseFormat)) {
 858       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
 859       return GL_TRUE;
 860    }
 861    else if (_mesa_is_enum_format_integer(format) !=
 862             _mesa_is_format_integer(texImage->TexFormat)) {
 863       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
 864       return GL_TRUE;
 865    }
 866
 867    if (!_mesa_validate_pbo_access(dimensions, &ctx->Pack, texImage->Width,
 868                                   texImage->Height, texImage->Depth,
 869                                   format, type, clientMemSize, pixels)) {
 870       if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 871          _mesa_error(ctx, GL_INVALID_OPERATION,
 872                      "glGetTexImage(out of bounds PBO access)");
 873       } else {
 874          _mesa_error(ctx, GL_INVALID_OPERATION,
 875                      "glGetnTexImageARB(out of bounds access:"
 876                      " bufSize (%d) is too small)", clientMemSize);
 877       }
 878       return GL_TRUE;
 879    }
 880
 881    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 882       /* PBO should not be mapped */
 883       if (_mesa_check_disallowed_mapping(ctx->Pack.BufferObj)) {
 884          _mesa_error(ctx, GL_INVALID_OPERATION,
 885                      "glGetTexImage(PBO is mapped)");
 886          return GL_TRUE;
 887       }
 888    }
 889
 890    return GL_FALSE;
 891 }
 892
 893
 894
 895 /**
 896  * Get texture image.  Called by glGetTexImage.
 897  *
 898  * \param target texture target.
 899  * \param level image level.
 900  * \param format pixel data format for returned image.
 901  * \param type pixel data type for returned image.
 902  * \param bufSize size of the pixels data buffer.
 903  * \param pixels returned pixel data.
 904  */
 905 void GLAPIENTRY
 906 _mesa_GetnTexImageARB( GLenum target, GLint level, GLenum format,
 907                        GLenum type, GLsizei bufSize, GLvoid *pixels )
 908 {
 909    struct gl_texture_object *texObj;
 910    struct gl_texture_image *texImage;
 911    GET_CURRENT_CONTEXT(ctx);
 912
 913    FLUSH_VERTICES(ctx, 0);
 914
 915    if (getteximage_error_check(ctx, target, level, format, type,
 916                                bufSize, pixels)) {
 917       return;
 918    }
 919
 920    if (!_mesa_is_bufferobj(ctx->Pack.BufferObj) && !pixels) {
 921       /* not an error, do nothing */
 922       return;
 923    }
 924
 925    texObj = _mesa_get_current_tex_object(ctx, target);
 926    texImage = _mesa_select_tex_image(ctx, texObj, target, level);
 927
 928    if (_mesa_is_zero_size_texture(texImage))
 929       return;
 930
 931    if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE)) {
 932       _mesa_debug(ctx, "glGetTexImage(tex %u) format = %s, w=%d, h=%d,"
 933                   " dstFmt=0x%x, dstType=0x%x\n",
 934                   texObj->Name,
 935                   _mesa_get_format_name(texImage->TexFormat),
 936                   texImage->Width, texImage->Height,
 937                   format, type);
 938    }
 939
 940    _mesa_lock_texture(ctx, texObj);
 941    {
 942       ctx->Driver.GetTexImage(ctx, format, type, pixels, texImage);
 943    }
 944    _mesa_unlock_texture(ctx, texObj);
 945 }
 946
 947
 948 void GLAPIENTRY
 949 _mesa_GetTexImage( GLenum target, GLint level, GLenum format,
 950                    GLenum type, GLvoid *pixels )
 951 {
 952    _mesa_GetnTexImageARB(target, level, format, type, INT_MAX, pixels);
 953 }
 954
 955
 956 /**
 957  * Do error checking for a glGetCompressedTexImage() call.
 958  * \return GL_TRUE if any error, GL_FALSE if no errors.
 959  */
 960 static GLboolean
 961 getcompressedteximage_error_check(struct gl_context *ctx, GLenum target,
 962                                   GLint level, GLsizei clientMemSize, GLvoid *img)
 963 {
 964    struct gl_texture_object *texObj;
 965    struct gl_texture_image *texImage;
 966    const GLint maxLevels = _mesa_max_texture_levels(ctx, target);
 967    GLuint compressedSize;
 968
 969    if (!legal_getteximage_target(ctx, target)) {
 970       _mesa_error(ctx, GL_INVALID_ENUM, "glGetCompressedTexImage(target=0x%x)",
 971                   target);
 972       return GL_TRUE;
 973    }
 974
 975    assert(maxLevels != 0);
 976    if (level < 0 || level >= maxLevels) {
 977       _mesa_error(ctx, GL_INVALID_VALUE,
 978                   "glGetCompressedTexImageARB(bad level = %d)", level);
 979       return GL_TRUE;
 980    }
 981
 982    texObj = _mesa_get_current_tex_object(ctx, target);
 983    if (!texObj) {
 984       _mesa_error(ctx, GL_INVALID_ENUM, "glGetCompressedTexImageARB(target)");
 985       return GL_TRUE;
 986    }
 987
 988    texImage = _mesa_select_tex_image(ctx, texObj, target, level);
 989
 990    if (!texImage) {
 991       /* probably invalid mipmap level */
 992       _mesa_error(ctx, GL_INVALID_VALUE,
 993                   "glGetCompressedTexImageARB(level)");
 994       return GL_TRUE;
 995    }
 996
 997    if (!_mesa_is_format_compressed(texImage->TexFormat)) {
 998       _mesa_error(ctx, GL_INVALID_OPERATION,
 999                   "glGetCompressedTexImageARB(texture is not compressed)");
1000       return GL_TRUE;
1001    }
1002
1003    compressedSize = _mesa_format_image_size(texImage->TexFormat,
1004                                             texImage->Width,
1005                                             texImage->Height,
1006                                             texImage->Depth);
1007
1008    if (!_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
1009       /* do bounds checking on writing to client memory */
1010       if (clientMemSize < (GLsizei) compressedSize) {
1011          _mesa_error(ctx, GL_INVALID_OPERATION,
1012                      "glGetnCompressedTexImageARB(out of bounds access:"
1013                      " bufSize (%d) is too small)", clientMemSize);
1014          return GL_TRUE;
1015       }
1016    } else {
1017       /* do bounds checking on PBO write */
1018       if ((const GLubyte *) img + compressedSize >
1019           (const GLubyte *) ctx->Pack.BufferObj->Size) {
1020          _mesa_error(ctx, GL_INVALID_OPERATION,
1021                      "glGetCompressedTexImage(out of bounds PBO access)");
1022          return GL_TRUE;
1023       }
1024
1025       /* make sure PBO is not mapped */
1026       if (_mesa_check_disallowed_mapping(ctx->Pack.BufferObj)) {
1027          _mesa_error(ctx, GL_INVALID_OPERATION,
1028                      "glGetCompressedTexImage(PBO is mapped)");
1029          return GL_TRUE;
1030       }
1031    }
1032
1033    return GL_FALSE;
1034 }
1035
1036
1037 void GLAPIENTRY
1038 _mesa_GetnCompressedTexImageARB(GLenum target, GLint level, GLsizei bufSize,
1039                                 GLvoid *img)
1040 {
1041    struct gl_texture_object *texObj;
1042    struct gl_texture_image *texImage;
1043    GET_CURRENT_CONTEXT(ctx);
1044
1045    FLUSH_VERTICES(ctx, 0);
1046
1047    if (getcompressedteximage_error_check(ctx, target, level, bufSize, img)) {
1048       return;
1049    }
1050
1051    if (!_mesa_is_bufferobj(ctx->Pack.BufferObj) && !img) {
1052       /* not an error, do nothing */
1053       return;
1054    }
1055
1056    texObj = _mesa_get_current_tex_object(ctx, target);
1057    texImage = _mesa_select_tex_image(ctx, texObj, target, level);
1058
1059    if (_mesa_is_zero_size_texture(texImage))
1060       return;
1061
1062    if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE)) {
1063       _mesa_debug(ctx,
1064                   "glGetCompressedTexImage(tex %u) format = %s, w=%d, h=%d\n",
1065                   texObj->Name,
1066                   _mesa_get_format_name(texImage->TexFormat),
1067                   texImage->Width, texImage->Height);
1068    }
1069
1070    _mesa_lock_texture(ctx, texObj);
1071    {
1072       ctx->Driver.GetCompressedTexImage(ctx, texImage, img);
1073    }
1074    _mesa_unlock_texture(ctx, texObj);
1075 }
1076
1077 void GLAPIENTRY
1078 _mesa_GetCompressedTexImage(GLenum target, GLint level, GLvoid *img)
1079 {
1080    _mesa_GetnCompressedTexImageARB(target, level, INT_MAX, img);
1081 }