src/mesa/main/texgetimage.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.7
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  * Copyright (c) 2009 VMware, Inc.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR 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 "image.h"
  38 #include "pack.h"
  39 #include "texgetimage.h"
  40 #include "teximage.h"
  41
  42
  43
  44 /**
  45  * Can the given type represent negative values?
  46  */
  47 static INLINE GLboolean
  48 type_with_negative_values(GLenum type)
  49 {
  50    switch (type) {
  51    case GL_BYTE:
  52    case GL_SHORT:
  53    case GL_INT:
  54    case GL_FLOAT:
  55    case GL_HALF_FLOAT_ARB:
  56       return GL_TRUE;
  57    default:
  58       return GL_FALSE;
  59    }
  60 }
  61
  62
  63 /**
  64  * glGetTexImage for color index pixels.
  65  */
  66 static void
  67 get_tex_color_index(struct gl_context *ctx, GLuint dimensions,
  68                     GLenum format, GLenum type, GLvoid *pixels,
  69                     const struct gl_texture_image *texImage)
  70 {
  71    const GLint width = texImage->Width;
  72    const GLint height = texImage->Height;
  73    const GLint depth = texImage->Depth;
  74    const GLuint indexBits =
  75       _mesa_get_format_bits(texImage->TexFormat, GL_TEXTURE_INDEX_SIZE_EXT);
  76    const GLbitfield transferOps = 0x0;
  77    GLint img, row, col;
  78
  79    for (img = 0; img < depth; img++) {
  80       for (row = 0; row < height; row++) {
  81          GLuint indexRow[MAX_WIDTH] = { 0 };
  82          void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
  83                                           width, height, format, type,
  84                                           img, row, 0);
  85          assert(dest);
  86
  87          if (indexBits == 8) {
  88             const GLubyte *src = (const GLubyte *) texImage->Data;
  89             src += width * (img * texImage->Height + row);
  90             for (col = 0; col < width; col++) {
  91                indexRow[col] = src[col];
  92             }
  93          }
  94          else if (indexBits == 16) {
  95             const GLushort *src = (const GLushort *) texImage->Data;
  96             src += width * (img * texImage->Height + row);
  97             for (col = 0; col < width; col++) {
  98                indexRow[col] = src[col];
  99             }
 100          }
 101          else {
 102             _mesa_problem(ctx, "Color index problem in _mesa_GetTexImage");
 103          }
 104          _mesa_pack_index_span(ctx, width, type, dest,
 105                                indexRow, &ctx->Pack, transferOps);
 106       }
 107    }
 108 }
 109
 110
 111 /**
 112  * glGetTexImage for depth/Z pixels.
 113  */
 114 static void
 115 get_tex_depth(struct gl_context *ctx, GLuint dimensions,
 116               GLenum format, GLenum type, GLvoid *pixels,
 117               const struct gl_texture_image *texImage)
 118 {
 119    const GLint width = texImage->Width;
 120    const GLint height = texImage->Height;
 121    const GLint depth = texImage->Depth;
 122    GLint img, row, col;
 123    GLfloat *depthRow = (GLfloat *) malloc(width * sizeof(GLfloat));
 124
 125    if (!depthRow) {
 126       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 127       return;
 128    }
 129
 130    for (img = 0; img < depth; img++) {
 131       for (row = 0; row < height; row++) {
 132          void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 133                                           width, height, format, type,
 134                                           img, row, 0);
 135          assert(dest);
 136
 137          for (col = 0; col < width; col++) {
 138             texImage->FetchTexelf(texImage, col, row, img, depthRow + col);
 139          }
 140          _mesa_pack_depth_span(ctx, width, dest, type, depthRow, &ctx->Pack);
 141       }
 142    }
 143
 144    free(depthRow);
 145 }
 146
 147
 148 /**
 149  * glGetTexImage for depth/stencil pixels.
 150  */
 151 static void
 152 get_tex_depth_stencil(struct gl_context *ctx, GLuint dimensions,
 153                       GLenum format, GLenum type, GLvoid *pixels,
 154                       const struct gl_texture_image *texImage)
 155 {
 156    const GLint width = texImage->Width;
 157    const GLint height = texImage->Height;
 158    const GLint depth = texImage->Depth;
 159    const GLuint *src = (const GLuint *) texImage->Data;
 160    GLint img, row;
 161
 162    for (img = 0; img < depth; img++) {
 163       for (row = 0; row < height; row++) {
 164          void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 165                                           width, height, format, type,
 166                                           img, row, 0);
 167          memcpy(dest, src, width * sizeof(GLuint));
 168          if (ctx->Pack.SwapBytes) {
 169             _mesa_swap4((GLuint *) dest, width);
 170          }
 171
 172          src += width * row + width * height * img;
 173       }
 174    }
 175 }
 176
 177
 178 /**
 179  * glGetTexImage for YCbCr pixels.
 180  */
 181 static void
 182 get_tex_ycbcr(struct gl_context *ctx, GLuint dimensions,
 183               GLenum format, GLenum type, GLvoid *pixels,
 184               const struct gl_texture_image *texImage)
 185 {
 186    const GLint width = texImage->Width;
 187    const GLint height = texImage->Height;
 188    const GLint depth = texImage->Depth;
 189    const GLint rowstride = texImage->RowStride;
 190    const GLushort *src = (const GLushort *) texImage->Data;
 191    GLint img, row;
 192
 193    for (img = 0; img < depth; img++) {
 194       for (row = 0; row < height; row++) {
 195          void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 196                                           width, height, format, type,
 197                                           img, row, 0);
 198          memcpy(dest, src, width * sizeof(GLushort));
 199
 200          /* check for byte swapping */
 201          if ((texImage->TexFormat == MESA_FORMAT_YCBCR
 202               && type == GL_UNSIGNED_SHORT_8_8_REV_MESA) ||
 203              (texImage->TexFormat == MESA_FORMAT_YCBCR_REV
 204               && type == GL_UNSIGNED_SHORT_8_8_MESA)) {
 205             if (!ctx->Pack.SwapBytes)
 206                _mesa_swap2((GLushort *) dest, width);
 207          }
 208          else if (ctx->Pack.SwapBytes) {
 209             _mesa_swap2((GLushort *) dest, width);
 210          }
 211
 212          src += rowstride;
 213       }
 214    }
 215 }
 216
 217
 218 #if FEATURE_EXT_texture_sRGB
 219
 220
 221 /**
 222  * Convert a float value from linear space to a
 223  * non-linear sRGB value in [0, 255].
 224  * Not terribly efficient.
 225  */
 226 static INLINE GLfloat
 227 linear_to_nonlinear(GLfloat cl)
 228 {
 229    /* can't have values outside [0, 1] */
 230    GLfloat cs;
 231    if (cl < 0.0031308f) {
 232       cs = 12.92f * cl;
 233    }
 234    else {
 235       cs = (GLfloat)(1.055 * pow(cl, 0.41666) - 0.055);
 236    }
 237    return cs;
 238 }
 239
 240
 241 /**
 242  * glGetTexImagefor sRGB pixels;
 243  */
 244 static void
 245 get_tex_srgb(struct gl_context *ctx, GLuint dimensions,
 246              GLenum format, GLenum type, GLvoid *pixels,
 247              const struct gl_texture_image *texImage)
 248 {
 249    const GLint width = texImage->Width;
 250    const GLint height = texImage->Height;
 251    const GLint depth = texImage->Depth;
 252    const GLbitfield transferOps = 0x0;
 253    GLint img, row;
 254    GLfloat (*rgba)[4] = (GLfloat (*)[4]) malloc(4 * width * sizeof(GLfloat));
 255
 256    if (!rgba) {
 257       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 258       return;
 259    }
 260
 261    for (img = 0; img < depth; img++) {
 262       for (row = 0; row < height; row++) {
 263          void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 264                                           width, height, format, type,
 265                                           img, row, 0);
 266
 267          GLint col;
 268
 269          /* convert row to RGBA format */
 270          for (col = 0; col < width; col++) {
 271             texImage->FetchTexelf(texImage, col, row, img, rgba[col]);
 272             if (texImage->_BaseFormat == GL_LUMINANCE) {
 273                rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]);
 274                rgba[col][GCOMP] = 0.0;
 275                rgba[col][BCOMP] = 0.0;
 276             }
 277             else if (texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {
 278                rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]);
 279                rgba[col][GCOMP] = 0.0;
 280                rgba[col][BCOMP] = 0.0;
 281             }
 282             else if (texImage->_BaseFormat == GL_RGB ||
 283                      texImage->_BaseFormat == GL_RGBA) {
 284                rgba[col][RCOMP] = linear_to_nonlinear(rgba[col][RCOMP]);
 285                rgba[col][GCOMP] = linear_to_nonlinear(rgba[col][GCOMP]);
 286                rgba[col][BCOMP] = linear_to_nonlinear(rgba[col][BCOMP]);
 287             }
 288          }
 289          _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,
 290                                     format, type, dest,
 291                                     &ctx->Pack, transferOps);
 292       }
 293    }
 294
 295    free(rgba);
 296 }
 297
 298
 299 #else /* FEATURE_EXT_texture_sRGB */
 300
 301
 302 static INLINE void
 303 get_tex_srgb(struct gl_context *ctx, GLuint dimensions,
 304              GLenum format, GLenum type, GLvoid *pixels,
 305              const struct gl_texture_image *texImage)
 306 {
 307    ASSERT_NO_FEATURE();
 308 }
 309
 310
 311 #endif /* FEATURE_EXT_texture_sRGB */
 312
 313
 314 /**
 315  * glGetTexImagefor RGBA, Luminance, etc. pixels.
 316  * This is the slow way since we use texture sampling.
 317  */
 318 static void
 319 get_tex_rgba(struct gl_context *ctx, GLuint dimensions,
 320              GLenum format, GLenum type, GLvoid *pixels,
 321              const struct gl_texture_image *texImage)
 322 {
 323    const GLint width = texImage->Width;
 324    const GLint height = texImage->Height;
 325    const GLint depth = texImage->Depth;
 326    /* Normally, no pixel transfer ops are performed during glGetTexImage.
 327     * The only possible exception is component clamping to [0,1].
 328     */
 329    GLbitfield transferOps = 0x0;
 330    GLint img, row;
 331    GLfloat (*rgba)[4] = (GLfloat (*)[4]) malloc(4 * width * sizeof(GLfloat));
 332
 333    if (!rgba) {
 334       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage");
 335       return;
 336    }
 337
 338    for (img = 0; img < depth; img++) {
 339       for (row = 0; row < height; row++) {
 340          void *dest = _mesa_image_address(dimensions, &ctx->Pack, pixels,
 341                                           width, height, format, type,
 342                                           img, row, 0);
 343          GLint col;
 344          GLenum dataType = _mesa_get_format_datatype(texImage->TexFormat);
 345
 346          /* clamp does not apply to GetTexImage (final conversion)?
 347           * Looks like we need clamp though when going from format
 348           * containing negative values to unsigned format.
 349           */
 350          if (format == GL_LUMINANCE || format == GL_LUMINANCE_ALPHA) {
 351             transferOps |= IMAGE_CLAMP_BIT;
 352          }
 353          else if (!type_with_negative_values(type) &&
 354                   (dataType == GL_FLOAT ||
 355                    dataType == GL_SIGNED_NORMALIZED)) {
 356             transferOps |= IMAGE_CLAMP_BIT;
 357          }
 358
 359          for (col = 0; col < width; col++) {
 360             texImage->FetchTexelf(texImage, col, row, img, rgba[col]);
 361             if (texImage->_BaseFormat == GL_ALPHA) {
 362                rgba[col][RCOMP] = 0.0F;
 363                rgba[col][GCOMP] = 0.0F;
 364                rgba[col][BCOMP] = 0.0F;
 365             }
 366             else if (texImage->_BaseFormat == GL_LUMINANCE) {
 367                rgba[col][GCOMP] = 0.0F;
 368                rgba[col][BCOMP] = 0.0F;
 369                rgba[col][ACOMP] = 1.0F;
 370             }
 371             else if (texImage->_BaseFormat == GL_LUMINANCE_ALPHA) {
 372                rgba[col][GCOMP] = 0.0F;
 373                rgba[col][BCOMP] = 0.0F;
 374             }
 375             else if (texImage->_BaseFormat == GL_INTENSITY) {
 376                rgba[col][GCOMP] = 0.0F;
 377                rgba[col][BCOMP] = 0.0F;
 378                rgba[col][ACOMP] = 1.0F;
 379             }
 380          }
 381          _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba,
 382                                     format, type, dest,
 383                                     &ctx->Pack, transferOps);
 384       }
 385    }
 386
 387    free(rgba);
 388 }
 389
 390
 391 /**
 392  * Try to do glGetTexImage() with simple memcpy().
 393  * \return GL_TRUE if done, GL_FALSE otherwise
 394  */
 395 static GLboolean
 396 get_tex_memcpy(struct gl_context *ctx, GLenum format, GLenum type, GLvoid *pixels,
 397                const struct gl_texture_object *texObj,
 398                const struct gl_texture_image *texImage)
 399 {
 400    GLboolean memCopy = GL_FALSE;
 401
 402    /* Texture image should have been mapped already */
 403    assert(texImage->Data);
 404
 405    /*
 406     * Check if the src/dst formats are compatible.
 407     * Also note that GL's pixel transfer ops don't apply to glGetTexImage()
 408     * so we don't have to worry about those.
 409     * XXX more format combinations could be supported here.
 410     */
 411    if ((texObj->Target == GL_TEXTURE_1D ||
 412         texObj->Target == GL_TEXTURE_2D ||
 413         texObj->Target == GL_TEXTURE_RECTANGLE ||
 414         (texObj->Target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X &&
 415          texObj->Target <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z))) {
 416       if (texImage->TexFormat == MESA_FORMAT_ARGB8888 &&
 417           format == GL_BGRA &&
 418           type == GL_UNSIGNED_BYTE &&
 419           !ctx->Pack.SwapBytes &&
 420           _mesa_little_endian()) {
 421          memCopy = GL_TRUE;
 422       }
 423       else if (texImage->TexFormat == MESA_FORMAT_AL88 &&
 424                format == GL_LUMINANCE_ALPHA &&
 425                type == GL_UNSIGNED_BYTE &&
 426                !ctx->Pack.SwapBytes &&
 427                _mesa_little_endian()) {
 428          memCopy = GL_TRUE;
 429       }
 430       else if (texImage->TexFormat == MESA_FORMAT_L8 &&
 431                format == GL_LUMINANCE &&
 432                type == GL_UNSIGNED_BYTE) {
 433          memCopy = GL_TRUE;
 434       }
 435       else if (texImage->TexFormat == MESA_FORMAT_A8 &&
 436                format == GL_ALPHA &&
 437                type == GL_UNSIGNED_BYTE) {
 438          memCopy = GL_TRUE;
 439       }
 440    }
 441
 442    if (memCopy) {
 443       const GLuint bpp = _mesa_get_format_bytes(texImage->TexFormat);
 444       const GLuint bytesPerRow = texImage->Width * bpp;
 445       GLubyte *dst =
 446          _mesa_image_address2d(&ctx->Pack, pixels, texImage->Width,
 447                                texImage->Height, format, type, 0, 0);
 448       const GLint dstRowStride =
 449          _mesa_image_row_stride(&ctx->Pack, texImage->Width, format, type);
 450       const GLubyte *src = texImage->Data;
 451       const GLint srcRowStride = texImage->RowStride * bpp;
 452       GLuint row;
 453
 454       if (bytesPerRow == dstRowStride && bytesPerRow == srcRowStride) {
 455          memcpy(dst, src, bytesPerRow * texImage->Height);
 456       }
 457       else {
 458          for (row = 0; row < texImage->Height; row++) {
 459             memcpy(dst, src, bytesPerRow);
 460             dst += dstRowStride;
 461             src += srcRowStride;
 462          }
 463       }
 464    }
 465
 466    return memCopy;
 467 }
 468
 469
 470 /**
 471  * This is the software fallback for Driver.GetTexImage().
 472  * All error checking will have been done before this routine is called.
 473  * The texture image must be mapped.
 474  */
 475 void
 476 _mesa_get_teximage(struct gl_context *ctx, GLenum target, GLint level,
 477                    GLenum format, GLenum type, GLvoid *pixels,
 478                    struct gl_texture_object *texObj,
 479                    struct gl_texture_image *texImage)
 480 {
 481    GLuint dimensions;
 482
 483    /* If we get here, the texture image should be mapped */
 484    assert(texImage->Data);
 485
 486    switch (target) {
 487    case GL_TEXTURE_1D:
 488       dimensions = 1;
 489       break;
 490    case GL_TEXTURE_3D:
 491       dimensions = 3;
 492       break;
 493    default:
 494       dimensions = 2;
 495    }
 496
 497    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 498       /* Packing texture image into a PBO.
 499        * Map the (potentially) VRAM-based buffer into our process space so
 500        * we can write into it with the code below.
 501        * A hardware driver might use a sophisticated blit to move the
 502        * texture data to the PBO if the PBO is in VRAM along with the texture.
 503        */
 504       GLubyte *buf = (GLubyte *)
 505          ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
 506                                GL_WRITE_ONLY_ARB, ctx->Pack.BufferObj);
 507       if (!buf) {
 508          /* out of memory or other unexpected error */
 509          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage(map PBO failed)");
 510          return;
 511       }
 512       /* <pixels> was an offset into the PBO.
 513        * Now make it a real, client-side pointer inside the mapped region.
 514        */
 515       pixels = ADD_POINTERS(buf, pixels);
 516    }
 517
 518    if (get_tex_memcpy(ctx, format, type, pixels, texObj, texImage)) {
 519       /* all done */
 520    }
 521    else if (format == GL_COLOR_INDEX) {
 522       get_tex_color_index(ctx, dimensions, format, type, pixels, texImage);
 523    }
 524    else if (format == GL_DEPTH_COMPONENT) {
 525       get_tex_depth(ctx, dimensions, format, type, pixels, texImage);
 526    }
 527    else if (format == GL_DEPTH_STENCIL_EXT) {
 528       get_tex_depth_stencil(ctx, dimensions, format, type, pixels, texImage);
 529    }
 530    else if (format == GL_YCBCR_MESA) {
 531       get_tex_ycbcr(ctx, dimensions, format, type, pixels, texImage);
 532    }
 533    else if (_mesa_get_format_color_encoding(texImage->TexFormat) == GL_SRGB) {
 534       get_tex_srgb(ctx, dimensions, format, type, pixels, texImage);
 535    }
 536    else {
 537       get_tex_rgba(ctx, dimensions, format, type, pixels, texImage);
 538    }
 539
 540    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 541       ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
 542                               ctx->Pack.BufferObj);
 543    }
 544 }
 545
 546
 547
 548 /**
 549  * This is the software fallback for Driver.GetCompressedTexImage().
 550  * All error checking will have been done before this routine is called.
 551  */
 552 void
 553 _mesa_get_compressed_teximage(struct gl_context *ctx, GLenum target, GLint level,
 554                               GLvoid *img,
 555                               struct gl_texture_object *texObj,
 556                               struct gl_texture_image *texImage)
 557 {
 558    const GLuint row_stride = _mesa_format_row_stride(texImage->TexFormat,
 559                                                      texImage->Width);
 560    const GLuint row_stride_stored = _mesa_format_row_stride(texImage->TexFormat,
 561                                                             texImage->RowStride);
 562    GLuint i;
 563
 564    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 565       /* pack texture image into a PBO */
 566       GLubyte *buf = (GLubyte *)
 567          ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
 568                                GL_WRITE_ONLY_ARB, ctx->Pack.BufferObj);
 569       if (!buf) {
 570          /* out of memory or other unexpected error */
 571          _mesa_error(ctx, GL_OUT_OF_MEMORY,
 572                      "glGetCompresssedTexImage(map PBO failed)");
 573          return;
 574       }
 575       img = ADD_POINTERS(buf, img);
 576    }
 577
 578    /* no pixelstore or pixel transfer, but respect stride */
 579
 580    if (row_stride == row_stride_stored) {
 581       const GLuint size = _mesa_format_image_size(texImage->TexFormat,
 582                                                   texImage->Width,
 583                                                   texImage->Height,
 584                                                   texImage->Depth);
 585       memcpy(img, texImage->Data, size);
 586    }
 587    else {
 588       GLuint bw, bh;
 589       _mesa_get_format_block_size(texImage->TexFormat, &bw, &bh);
 590       for (i = 0; i < (texImage->Height + bh - 1) / bh; i++) {
 591          memcpy((GLubyte *)img + i * row_stride,
 592                 (GLubyte *)texImage->Data + i * row_stride_stored,
 593                 row_stride);
 594       }
 595    }
 596
 597    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 598       ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
 599                               ctx->Pack.BufferObj);
 600    }
 601 }
 602
 603
 604
 605 /**
 606  * Do error checking for a glGetTexImage() call.
 607  * \return GL_TRUE if any error, GL_FALSE if no errors.
 608  */
 609 static GLboolean
 610 getteximage_error_check(struct gl_context *ctx, GLenum target, GLint level,
 611                         GLenum format, GLenum type, GLvoid *pixels )
 612 {
 613    struct gl_texture_object *texObj;
 614    struct gl_texture_image *texImage;
 615    const GLint maxLevels = _mesa_max_texture_levels(ctx, target);
 616    GLenum baseFormat;
 617
 618    if (maxLevels == 0) {
 619       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(target=0x%x)", target);
 620       return GL_TRUE;
 621    }
 622
 623    if (level < 0 || level >= maxLevels) {
 624       _mesa_error( ctx, GL_INVALID_VALUE, "glGetTexImage(level)" );
 625       return GL_TRUE;
 626    }
 627
 628    if (_mesa_sizeof_packed_type(type) <= 0) {
 629       _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexImage(type)" );
 630       return GL_TRUE;
 631    }
 632
 633    if (_mesa_components_in_format(format) <= 0 ||
 634        format == GL_STENCIL_INDEX) {
 635       _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexImage(format)" );
 636       return GL_TRUE;
 637    }
 638
 639    if (!ctx->Extensions.EXT_paletted_texture && _mesa_is_index_format(format)) {
 640       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
 641       return GL_TRUE;
 642    }
 643
 644    if (!ctx->Extensions.ARB_depth_texture && _mesa_is_depth_format(format)) {
 645       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
 646       return GL_TRUE;
 647    }
 648
 649    if (!ctx->Extensions.MESA_ycbcr_texture && _mesa_is_ycbcr_format(format)) {
 650       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
 651       return GL_TRUE;
 652    }
 653
 654    if (!ctx->Extensions.EXT_packed_depth_stencil
 655        && _mesa_is_depthstencil_format(format)) {
 656       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
 657       return GL_TRUE;
 658    }
 659
 660    if (!ctx->Extensions.ATI_envmap_bumpmap
 661        && _mesa_is_dudv_format(format)) {
 662       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
 663       return GL_TRUE;
 664    }
 665
 666    texObj = _mesa_get_current_tex_object(ctx, target);
 667
 668    if (!texObj || _mesa_is_proxy_texture(target)) {
 669       _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(target)");
 670       return GL_TRUE;
 671    }
 672
 673    texImage = _mesa_select_tex_image(ctx, texObj, target, level);
 674    if (!texImage) {
 675       /* out of memory */
 676       return GL_TRUE;
 677    }
 678
 679    baseFormat = _mesa_get_format_base_format(texImage->TexFormat);
 680
 681    /* Make sure the requested image format is compatible with the
 682     * texture's format.  Note that a color index texture can be converted
 683     * to RGBA so that combo is allowed.
 684     */
 685    if (_mesa_is_color_format(format)
 686        && !_mesa_is_color_format(baseFormat)
 687        && !_mesa_is_index_format(baseFormat)) {
 688       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
 689       return GL_TRUE;
 690    }
 691    else if (_mesa_is_index_format(format)
 692             && !_mesa_is_index_format(baseFormat)) {
 693       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
 694       return GL_TRUE;
 695    }
 696    else if (_mesa_is_depth_format(format)
 697             && !_mesa_is_depth_format(baseFormat)
 698             && !_mesa_is_depthstencil_format(baseFormat)) {
 699       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
 700       return GL_TRUE;
 701    }
 702    else if (_mesa_is_ycbcr_format(format)
 703             && !_mesa_is_ycbcr_format(baseFormat)) {
 704       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
 705       return GL_TRUE;
 706    }
 707    else if (_mesa_is_depthstencil_format(format)
 708             && !_mesa_is_depthstencil_format(baseFormat)) {
 709       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
 710       return GL_TRUE;
 711    }
 712    else if (_mesa_is_dudv_format(format)
 713             && !_mesa_is_dudv_format(baseFormat)) {
 714       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexImage(format mismatch)");
 715       return GL_TRUE;
 716    }
 717
 718    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 719       /* packing texture image into a PBO */
 720       const GLuint dimensions = (target == GL_TEXTURE_3D) ? 3 : 2;
 721       if (!_mesa_validate_pbo_access(dimensions, &ctx->Pack, texImage->Width,
 722                                      texImage->Height, texImage->Depth,
 723                                      format, type, pixels)) {
 724          _mesa_error(ctx, GL_INVALID_OPERATION,
 725                      "glGetTexImage(out of bounds PBO write)");
 726          return GL_TRUE;
 727       }
 728
 729       /* PBO should not be mapped */
 730       if (_mesa_bufferobj_mapped(ctx->Pack.BufferObj)) {
 731          _mesa_error(ctx, GL_INVALID_OPERATION,
 732                      "glGetTexImage(PBO is mapped)");
 733          return GL_TRUE;
 734       }
 735    }
 736
 737    return GL_FALSE;
 738 }
 739
 740
 741
 742 /**
 743  * Get texture image.  Called by glGetTexImage.
 744  *
 745  * \param target texture target.
 746  * \param level image level.
 747  * \param format pixel data format for returned image.
 748  * \param type pixel data type for returned image.
 749  * \param pixels returned pixel data.
 750  */
 751 void GLAPIENTRY
 752 _mesa_GetTexImage( GLenum target, GLint level, GLenum format,
 753                    GLenum type, GLvoid *pixels )
 754 {
 755    struct gl_texture_object *texObj;
 756    struct gl_texture_image *texImage;
 757    GET_CURRENT_CONTEXT(ctx);
 758    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 759
 760    if (getteximage_error_check(ctx, target, level, format, type, pixels)) {
 761       return;
 762    }
 763
 764    if (!_mesa_is_bufferobj(ctx->Pack.BufferObj) && !pixels) {
 765       /* not an error, do nothing */
 766       return;
 767    }
 768
 769    texObj = _mesa_get_current_tex_object(ctx, target);
 770    texImage = _mesa_select_tex_image(ctx, texObj, target, level);
 771
 772    if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE)) {
 773       _mesa_debug(ctx, "glGetTexImage(tex %u) format = %s, w=%d, h=%d,"
 774                   " dstFmt=0x%x, dstType=0x%x\n",
 775                   texObj->Name,
 776                   _mesa_get_format_name(texImage->TexFormat),
 777                   texImage->Width, texImage->Height,
 778                   format, type);
 779    }
 780
 781    _mesa_lock_texture(ctx, texObj);
 782    {
 783       ctx->Driver.GetTexImage(ctx, target, level, format, type, pixels,
 784                               texObj, texImage);
 785    }
 786    _mesa_unlock_texture(ctx, texObj);
 787 }
 788
 789
 790
 791 /**
 792  * Do error checking for a glGetCompressedTexImage() call.
 793  * \return GL_TRUE if any error, GL_FALSE if no errors.
 794  */
 795 static GLboolean
 796 getcompressedteximage_error_check(struct gl_context *ctx, GLenum target, GLint level,
 797                                   GLvoid *img)
 798 {
 799    struct gl_texture_object *texObj;
 800    struct gl_texture_image *texImage;
 801    const GLint maxLevels = _mesa_max_texture_levels(ctx, target);
 802
 803    if (maxLevels == 0) {
 804       _mesa_error(ctx, GL_INVALID_ENUM, "glGetCompressedTexImage(target=0x%x)",
 805                   target);
 806       return GL_TRUE;
 807    }
 808
 809    if (level < 0 || level >= maxLevels) {
 810       _mesa_error(ctx, GL_INVALID_VALUE,
 811                   "glGetCompressedTexImageARB(bad level = %d)", level);
 812       return GL_TRUE;
 813    }
 814
 815    if (_mesa_is_proxy_texture(target)) {
 816       _mesa_error(ctx, GL_INVALID_ENUM,
 817                   "glGetCompressedTexImageARB(bad target = %s)",
 818                   _mesa_lookup_enum_by_nr(target));
 819       return GL_TRUE;
 820    }
 821
 822    texObj = _mesa_get_current_tex_object(ctx, target);
 823    if (!texObj) {
 824       _mesa_error(ctx, GL_INVALID_ENUM, "glGetCompressedTexImageARB(target)");
 825       return GL_TRUE;
 826    }
 827
 828    texImage = _mesa_select_tex_image(ctx, texObj, target, level);
 829
 830    if (!texImage) {
 831       /* probably invalid mipmap level */
 832       _mesa_error(ctx, GL_INVALID_VALUE,
 833                   "glGetCompressedTexImageARB(level)");
 834       return GL_TRUE;
 835    }
 836
 837    if (!_mesa_is_format_compressed(texImage->TexFormat)) {
 838       _mesa_error(ctx, GL_INVALID_OPERATION,
 839                   "glGetCompressedTexImageARB(texture is not compressed)");
 840       return GL_TRUE;
 841    }
 842
 843    if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) {
 844       GLuint compressedSize;
 845
 846       /* make sure PBO is not mapped */
 847       if (_mesa_bufferobj_mapped(ctx->Pack.BufferObj)) {
 848          _mesa_error(ctx, GL_INVALID_OPERATION,
 849                      "glGetCompressedTexImage(PBO is mapped)");
 850          return GL_TRUE;
 851       }
 852
 853       compressedSize = _mesa_format_image_size(texImage->TexFormat,
 854                                                texImage->Width,
 855                                                texImage->Height,
 856                                                texImage->Depth);
 857
 858       /* do bounds checking on PBO write */
 859       if ((const GLubyte *) img + compressedSize >
 860           (const GLubyte *) ctx->Pack.BufferObj->Size) {
 861          _mesa_error(ctx, GL_INVALID_OPERATION,
 862                      "glGetCompressedTexImage(out of bounds PBO write)");
 863          return GL_TRUE;
 864       }
 865    }
 866
 867    return GL_FALSE;
 868 }
 869
 870
 871 void GLAPIENTRY
 872 _mesa_GetCompressedTexImageARB(GLenum target, GLint level, GLvoid *img)
 873 {
 874    struct gl_texture_object *texObj;
 875    struct gl_texture_image *texImage;
 876    GET_CURRENT_CONTEXT(ctx);
 877    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 878
 879    if (getcompressedteximage_error_check(ctx, target, level, img)) {
 880       return;
 881    }
 882
 883    if (_mesa_is_bufferobj(ctx->Pack.BufferObj) && !img) {
 884       /* not an error, do nothing */
 885       return;
 886    }
 887
 888    texObj = _mesa_get_current_tex_object(ctx, target);
 889    texImage = _mesa_select_tex_image(ctx, texObj, target, level);
 890
 891    if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE)) {
 892       _mesa_debug(ctx,
 893                   "glGetCompressedTexImage(tex %u) format = %s, w=%d, h=%d\n",
 894                   texObj->Name,
 895                   _mesa_get_format_name(texImage->TexFormat),
 896                   texImage->Width, texImage->Height);
 897    }
 898
 899    _mesa_lock_texture(ctx, texObj);
 900    {
 901       ctx->Driver.GetCompressedTexImage(ctx, target, level, img,
 902                                         texObj, texImage);
 903    }
 904    _mesa_unlock_texture(ctx, texObj);
 905 }