src/mesa/main/texstore.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (c) 2008-2009  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  * Authors:
  28  *   Brian Paul
  29  */
  30
  31 /**
  32  * The GL texture image functions in teximage.c basically just do
  33  * error checking and data structure allocation.  They in turn call
  34  * device driver functions which actually copy/convert/store the user's
  35  * texture image data.
  36  *
  37  * However, most device drivers will be able to use the fallback functions
  38  * in this file.  That is, most drivers will have the following bit of
  39  * code:
  40  *   ctx->Driver.TexImage = _mesa_store_teximage;
  41  *   ctx->Driver.TexSubImage = _mesa_store_texsubimage;
  42  *   etc...
  43  *
  44  * Texture image processing is actually kind of complicated.  We have to do:
  45  *    Format/type conversions
  46  *    pixel unpacking
  47  *    pixel transfer (scale, bais, lookup, etc)
  48  *
  49  * These functions can handle most everything, including processing full
  50  * images and sub-images.
  51  */
  52
  53
  54 #include "errors.h"
  55 #include "glheader.h"
  56 #include "bufferobj.h"
  57 #include "format_pack.h"
  58 #include "format_utils.h"
  59 #include "image.h"
  60 #include "macros.h"
  61 #include "mipmap.h"
  62 #include "mtypes.h"
  63 #include "pack.h"
  64 #include "pbo.h"
  65
  66 #include "texcompress.h"
  67 #include "texcompress_fxt1.h"
  68 #include "texcompress_rgtc.h"
  69 #include "texcompress_s3tc.h"
  70 #include "texcompress_etc.h"
  71 #include "texcompress_bptc.h"
  72 #include "teximage.h"
  73 #include "texstore.h"
  74 #include "enums.h"
  75 #include "glformats.h"
  76 #include "pixeltransfer.h"
  77 #include "util/format_rgb9e5.h"
  78 #include "util/format_r11g11b10f.h"
  79
  80
  81 enum {
  82    ZERO = 4,
  83    ONE = 5
  84 };
  85
  86
  87 /**
  88  * Texture image storage function.
  89  */
  90 typedef GLboolean (*StoreTexImageFunc)(TEXSTORE_PARAMS);
  91
  92
  93 /**
  94  * Teximage storage routine for when a simple memcpy will do.
  95  * No pixel transfer operations or special texel encodings allowed.
  96  * 1D, 2D and 3D images supported.
  97  */
  98 void
  99 _mesa_memcpy_texture(struct gl_context *ctx,
 100                      GLuint dimensions,
 101                      mesa_format dstFormat,
 102                      GLint dstRowStride,
 103                      GLubyte **dstSlices,
 104                      GLint srcWidth, GLint srcHeight, GLint srcDepth,
 105                      GLenum srcFormat, GLenum srcType,
 106                      const GLvoid *srcAddr,
 107                      const struct gl_pixelstore_attrib *srcPacking)
 108 {
 109    const GLint srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth,
 110                                                      srcFormat, srcType);
 111    const GLint srcImageStride = _mesa_image_image_stride(srcPacking,
 112                                       srcWidth, srcHeight, srcFormat, srcType);
 113    const GLubyte *srcImage = (const GLubyte *) _mesa_image_address(dimensions,
 114         srcPacking, srcAddr, srcWidth, srcHeight, srcFormat, srcType, 0, 0, 0);
 115    const GLuint texelBytes = _mesa_get_format_bytes(dstFormat);
 116    const GLint bytesPerRow = srcWidth * texelBytes;
 117
 118    if (dstRowStride == srcRowStride &&
 119        dstRowStride == bytesPerRow) {
 120       /* memcpy image by image */
 121       GLint img;
 122       for (img = 0; img < srcDepth; img++) {
 123          GLubyte *dstImage = dstSlices[img];
 124          memcpy(dstImage, srcImage, bytesPerRow * srcHeight);
 125          srcImage += srcImageStride;
 126       }
 127    }
 128    else {
 129       /* memcpy row by row */
 130       GLint img, row;
 131       for (img = 0; img < srcDepth; img++) {
 132          const GLubyte *srcRow = srcImage;
 133          GLubyte *dstRow = dstSlices[img];
 134          for (row = 0; row < srcHeight; row++) {
 135             memcpy(dstRow, srcRow, bytesPerRow);
 136             dstRow += dstRowStride;
 137             srcRow += srcRowStride;
 138          }
 139          srcImage += srcImageStride;
 140       }
 141    }
 142 }
 143
 144
 145 /**
 146  * Store a 32-bit integer or float depth component texture image.
 147  */
 148 static GLboolean
 149 _mesa_texstore_z32(TEXSTORE_PARAMS)
 150 {
 151    const GLuint depthScale = 0xffffffff;
 152    GLenum dstType;
 153    (void) dims;
 154    assert(dstFormat == MESA_FORMAT_Z_UNORM32 ||
 155           dstFormat == MESA_FORMAT_Z_FLOAT32);
 156    assert(_mesa_get_format_bytes(dstFormat) == sizeof(GLuint));
 157
 158    if (dstFormat == MESA_FORMAT_Z_UNORM32)
 159       dstType = GL_UNSIGNED_INT;
 160    else
 161       dstType = GL_FLOAT;
 162
 163    {
 164       /* general path */
 165       GLint img, row;
 166       for (img = 0; img < srcDepth; img++) {
 167          GLubyte *dstRow = dstSlices[img];
 168          for (row = 0; row < srcHeight; row++) {
 169             const GLvoid *src = _mesa_image_address(dims, srcPacking,
 170                 srcAddr, srcWidth, srcHeight, srcFormat, srcType, img, row, 0);
 171             _mesa_unpack_depth_span(ctx, srcWidth,
 172                                     dstType, dstRow,
 173                                     depthScale, srcType, src, srcPacking);
 174             dstRow += dstRowStride;
 175          }
 176       }
 177    }
 178    return GL_TRUE;
 179 }
 180
 181
 182 /**
 183  * Store a 24-bit integer depth component texture image.
 184  */
 185 static GLboolean
 186 _mesa_texstore_x8_z24(TEXSTORE_PARAMS)
 187 {
 188    const GLuint depthScale = 0xffffff;
 189
 190    (void) dims;
 191    assert(dstFormat == MESA_FORMAT_Z24_UNORM_X8_UINT);
 192
 193    {
 194       /* general path */
 195       GLint img, row;
 196       for (img = 0; img < srcDepth; img++) {
 197          GLubyte *dstRow = dstSlices[img];
 198          for (row = 0; row < srcHeight; row++) {
 199             const GLvoid *src = _mesa_image_address(dims, srcPacking,
 200                 srcAddr, srcWidth, srcHeight, srcFormat, srcType, img, row, 0);
 201             _mesa_unpack_depth_span(ctx, srcWidth,
 202                                     GL_UNSIGNED_INT, (GLuint *) dstRow,
 203                                     depthScale, srcType, src, srcPacking);
 204             dstRow += dstRowStride;
 205          }
 206       }
 207    }
 208    return GL_TRUE;
 209 }
 210
 211
 212 /**
 213  * Store a 24-bit integer depth component texture image.
 214  */
 215 static GLboolean
 216 _mesa_texstore_z24_x8(TEXSTORE_PARAMS)
 217 {
 218    const GLuint depthScale = 0xffffff;
 219
 220    (void) dims;
 221    assert(dstFormat == MESA_FORMAT_X8_UINT_Z24_UNORM);
 222
 223    {
 224       /* general path */
 225       GLint img, row;
 226       for (img = 0; img < srcDepth; img++) {
 227          GLubyte *dstRow = dstSlices[img];
 228          for (row = 0; row < srcHeight; row++) {
 229             const GLvoid *src = _mesa_image_address(dims, srcPacking,
 230                 srcAddr, srcWidth, srcHeight, srcFormat, srcType, img, row, 0);
 231             GLuint *dst = (GLuint *) dstRow;
 232             GLint i;
 233             _mesa_unpack_depth_span(ctx, srcWidth,
 234                                     GL_UNSIGNED_INT, dst,
 235                                     depthScale, srcType, src, srcPacking);
 236             for (i = 0; i < srcWidth; i++)
 237                dst[i] <<= 8;
 238             dstRow += dstRowStride;
 239          }
 240       }
 241    }
 242    return GL_TRUE;
 243 }
 244
 245
 246 /**
 247  * Store a 16-bit integer depth component texture image.
 248  */
 249 static GLboolean
 250 _mesa_texstore_z16(TEXSTORE_PARAMS)
 251 {
 252    const GLuint depthScale = 0xffff;
 253    (void) dims;
 254    assert(dstFormat == MESA_FORMAT_Z_UNORM16);
 255    assert(_mesa_get_format_bytes(dstFormat) == sizeof(GLushort));
 256
 257    {
 258       /* general path */
 259       GLint img, row;
 260       for (img = 0; img < srcDepth; img++) {
 261          GLubyte *dstRow = dstSlices[img];
 262          for (row = 0; row < srcHeight; row++) {
 263             const GLvoid *src = _mesa_image_address(dims, srcPacking,
 264                 srcAddr, srcWidth, srcHeight, srcFormat, srcType, img, row, 0);
 265             GLushort *dst16 = (GLushort *) dstRow;
 266             _mesa_unpack_depth_span(ctx, srcWidth,
 267                                     GL_UNSIGNED_SHORT, dst16, depthScale,
 268                                     srcType, src, srcPacking);
 269             dstRow += dstRowStride;
 270          }
 271       }
 272    }
 273    return GL_TRUE;
 274 }
 275
 276
 277 /**
 278  * Texstore for _mesa_texformat_ycbcr or _mesa_texformat_ycbcr_REV.
 279  */
 280 static GLboolean
 281 _mesa_texstore_ycbcr(TEXSTORE_PARAMS)
 282 {
 283    (void) ctx; (void) dims; (void) baseInternalFormat;
 284
 285    assert((dstFormat == MESA_FORMAT_YCBCR) ||
 286           (dstFormat == MESA_FORMAT_YCBCR_REV));
 287    assert(_mesa_get_format_bytes(dstFormat) == 2);
 288    assert(ctx->Extensions.MESA_ycbcr_texture);
 289    assert(srcFormat == GL_YCBCR_MESA);
 290    assert((srcType == GL_UNSIGNED_SHORT_8_8_MESA) ||
 291           (srcType == GL_UNSIGNED_SHORT_8_8_REV_MESA));
 292    assert(baseInternalFormat == GL_YCBCR_MESA);
 293
 294    /* always just memcpy since no pixel transfer ops apply */
 295    _mesa_memcpy_texture(ctx, dims,
 296                         dstFormat,
 297                         dstRowStride, dstSlices,
 298                         srcWidth, srcHeight, srcDepth, srcFormat, srcType,
 299                         srcAddr, srcPacking);
 300
 301    /* Check if we need byte swapping */
 302    /* XXX the logic here _might_ be wrong */
 303    if (srcPacking->SwapBytes ^
 304        (srcType == GL_UNSIGNED_SHORT_8_8_REV_MESA) ^
 305        (dstFormat == MESA_FORMAT_YCBCR_REV) ^
 306        !UTIL_ARCH_LITTLE_ENDIAN) {
 307       GLint img, row;
 308       for (img = 0; img < srcDepth; img++) {
 309          GLubyte *dstRow = dstSlices[img];
 310          for (row = 0; row < srcHeight; row++) {
 311             _mesa_swap2((GLushort *) dstRow, srcWidth);
 312             dstRow += dstRowStride;
 313          }
 314       }
 315    }
 316    return GL_TRUE;
 317 }
 318
 319
 320 /**
 321  * Store a combined depth/stencil texture image.
 322  */
 323 static GLboolean
 324 _mesa_texstore_z24_s8(TEXSTORE_PARAMS)
 325 {
 326    const GLuint depthScale = 0xffffff;
 327    const GLint srcRowStride
 328       = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat, srcType);
 329    GLint img, row;
 330    GLuint *depth = malloc(srcWidth * sizeof(GLuint));
 331    GLubyte *stencil = malloc(srcWidth * sizeof(GLubyte));
 332
 333    assert(dstFormat == MESA_FORMAT_S8_UINT_Z24_UNORM);
 334    assert(srcFormat == GL_DEPTH_STENCIL_EXT ||
 335           srcFormat == GL_DEPTH_COMPONENT ||
 336           srcFormat == GL_STENCIL_INDEX);
 337    assert(srcFormat != GL_DEPTH_STENCIL_EXT ||
 338           srcType == GL_UNSIGNED_INT_24_8_EXT ||
 339           srcType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
 340
 341    if (!depth || !stencil) {
 342       free(depth);
 343       free(stencil);
 344       return GL_FALSE;
 345    }
 346
 347    /* In case we only upload depth we need to preserve the stencil */
 348    for (img = 0; img < srcDepth; img++) {
 349       GLuint *dstRow = (GLuint *) dstSlices[img];
 350       const GLubyte *src
 351          = (const GLubyte *) _mesa_image_address(dims, srcPacking, srcAddr,
 352                srcWidth, srcHeight,
 353                srcFormat, srcType,
 354                img, 0, 0);
 355       for (row = 0; row < srcHeight; row++) {
 356          GLint i;
 357          GLboolean keepdepth = GL_FALSE, keepstencil = GL_FALSE;
 358
 359          if (srcFormat == GL_DEPTH_COMPONENT) { /* preserve stencil */
 360             keepstencil = GL_TRUE;
 361          }
 362          else if (srcFormat == GL_STENCIL_INDEX) { /* preserve depth */
 363             keepdepth = GL_TRUE;
 364          }
 365
 366          if (keepdepth == GL_FALSE)
 367             /* the 24 depth bits will be in the low position: */
 368             _mesa_unpack_depth_span(ctx, srcWidth,
 369                                     GL_UNSIGNED_INT, /* dst type */
 370                                     keepstencil ? depth : dstRow, /* dst addr */
 371                                     depthScale,
 372                                     srcType, src, srcPacking);
 373
 374          if (keepstencil == GL_FALSE)
 375             /* get the 8-bit stencil values */
 376             _mesa_unpack_stencil_span(ctx, srcWidth,
 377                                       GL_UNSIGNED_BYTE, /* dst type */
 378                                       stencil, /* dst addr */
 379                                       srcType, src, srcPacking,
 380                                       ctx->_ImageTransferState);
 381
 382          for (i = 0; i < srcWidth; i++) {
 383             if (keepstencil)
 384                dstRow[i] = depth[i] << 8 | (dstRow[i] & 0x000000FF);
 385             else
 386                dstRow[i] = (dstRow[i] & 0xFFFFFF00) | (stencil[i] & 0xFF);
 387          }
 388          src += srcRowStride;
 389          dstRow += dstRowStride / sizeof(GLuint);
 390       }
 391    }
 392
 393    free(depth);
 394    free(stencil);
 395    return GL_TRUE;
 396 }
 397
 398
 399 /**
 400  * Store a combined depth/stencil texture image.
 401  */
 402 static GLboolean
 403 _mesa_texstore_s8_z24(TEXSTORE_PARAMS)
 404 {
 405    const GLuint depthScale = 0xffffff;
 406    const GLint srcRowStride
 407       = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat, srcType);
 408    GLint img, row;
 409    GLuint *depth;
 410    GLubyte *stencil;
 411
 412    assert(dstFormat == MESA_FORMAT_Z24_UNORM_S8_UINT);
 413    assert(srcFormat == GL_DEPTH_STENCIL_EXT ||
 414           srcFormat == GL_DEPTH_COMPONENT ||
 415           srcFormat == GL_STENCIL_INDEX);
 416    assert(srcFormat != GL_DEPTH_STENCIL_EXT ||
 417           srcType == GL_UNSIGNED_INT_24_8_EXT ||
 418           srcType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
 419
 420    depth = malloc(srcWidth * sizeof(GLuint));
 421    stencil = malloc(srcWidth * sizeof(GLubyte));
 422
 423    if (!depth || !stencil) {
 424       free(depth);
 425       free(stencil);
 426       return GL_FALSE;
 427    }
 428
 429    for (img = 0; img < srcDepth; img++) {
 430       GLuint *dstRow = (GLuint *) dstSlices[img];
 431       const GLubyte *src
 432          = (const GLubyte *) _mesa_image_address(dims, srcPacking, srcAddr,
 433                                                 srcWidth, srcHeight,
 434                                                 srcFormat, srcType,
 435                                                 img, 0, 0);
 436       for (row = 0; row < srcHeight; row++) {
 437          GLint i;
 438          GLboolean keepdepth = GL_FALSE, keepstencil = GL_FALSE;
 439
 440          if (srcFormat == GL_DEPTH_COMPONENT) { /* preserve stencil */
 441             keepstencil = GL_TRUE;
 442          }
 443          else if (srcFormat == GL_STENCIL_INDEX) { /* preserve depth */
 444             keepdepth = GL_TRUE;
 445          }
 446
 447          if (keepdepth == GL_FALSE)
 448             /* the 24 depth bits will be in the low position: */
 449             _mesa_unpack_depth_span(ctx, srcWidth,
 450                                     GL_UNSIGNED_INT, /* dst type */
 451                                     keepstencil ? depth : dstRow, /* dst addr */
 452                                     depthScale,
 453                                     srcType, src, srcPacking);
 454
 455          if (keepstencil == GL_FALSE)
 456             /* get the 8-bit stencil values */
 457             _mesa_unpack_stencil_span(ctx, srcWidth,
 458                                       GL_UNSIGNED_BYTE, /* dst type */
 459                                       stencil, /* dst addr */
 460                                       srcType, src, srcPacking,
 461                                       ctx->_ImageTransferState);
 462
 463          /* merge stencil values into depth values */
 464          for (i = 0; i < srcWidth; i++) {
 465             if (keepstencil)
 466                dstRow[i] = depth[i] | (dstRow[i] & 0xFF000000);
 467             else
 468                dstRow[i] = (dstRow[i] & 0xFFFFFF) | (stencil[i] << 24);
 469
 470          }
 471          src += srcRowStride;
 472          dstRow += dstRowStride / sizeof(GLuint);
 473       }
 474    }
 475
 476    free(depth);
 477    free(stencil);
 478
 479    return GL_TRUE;
 480 }
 481
 482
 483 /**
 484  * Store simple 8-bit/value stencil texture data.
 485  */
 486 static GLboolean
 487 _mesa_texstore_s8(TEXSTORE_PARAMS)
 488 {
 489    assert(dstFormat == MESA_FORMAT_S_UINT8);
 490    assert(srcFormat == GL_STENCIL_INDEX);
 491
 492    {
 493       const GLint srcRowStride
 494          = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat, srcType);
 495       GLint img, row;
 496       GLubyte *stencil = malloc(srcWidth * sizeof(GLubyte));
 497
 498       if (!stencil)
 499          return GL_FALSE;
 500
 501       for (img = 0; img < srcDepth; img++) {
 502          GLubyte *dstRow = dstSlices[img];
 503          const GLubyte *src
 504             = (const GLubyte *) _mesa_image_address(dims, srcPacking, srcAddr,
 505                                                    srcWidth, srcHeight,
 506                                                    srcFormat, srcType,
 507                                                    img, 0, 0);
 508          for (row = 0; row < srcHeight; row++) {
 509             GLint i;
 510
 511             /* get the 8-bit stencil values */
 512             _mesa_unpack_stencil_span(ctx, srcWidth,
 513                                       GL_UNSIGNED_BYTE, /* dst type */
 514                                       stencil, /* dst addr */
 515                                       srcType, src, srcPacking,
 516                                       ctx->_ImageTransferState);
 517             /* merge stencil values into depth values */
 518             for (i = 0; i < srcWidth; i++)
 519                dstRow[i] = stencil[i];
 520
 521             src += srcRowStride;
 522             dstRow += dstRowStride / sizeof(GLubyte);
 523          }
 524       }
 525
 526       free(stencil);
 527    }
 528
 529    return GL_TRUE;
 530 }
 531
 532
 533 static GLboolean
 534 _mesa_texstore_z32f_x24s8(TEXSTORE_PARAMS)
 535 {
 536    GLint img, row;
 537    const GLint srcRowStride
 538       = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat, srcType)
 539          / sizeof(int32_t);
 540
 541    assert(dstFormat == MESA_FORMAT_Z32_FLOAT_S8X24_UINT);
 542    assert(srcFormat == GL_DEPTH_STENCIL ||
 543           srcFormat == GL_DEPTH_COMPONENT ||
 544           srcFormat == GL_STENCIL_INDEX);
 545    assert(srcFormat != GL_DEPTH_STENCIL ||
 546           srcType == GL_UNSIGNED_INT_24_8 ||
 547           srcType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
 548
 549    /* In case we only upload depth we need to preserve the stencil */
 550    for (img = 0; img < srcDepth; img++) {
 551       uint64_t *dstRow = (uint64_t *) dstSlices[img];
 552       const int32_t *src
 553          = (const int32_t *) _mesa_image_address(dims, srcPacking, srcAddr,
 554                srcWidth, srcHeight,
 555                srcFormat, srcType,
 556                img, 0, 0);
 557       for (row = 0; row < srcHeight; row++) {
 558          /* The unpack functions with:
 559           *    dstType = GL_FLOAT_32_UNSIGNED_INT_24_8_REV
 560           * only write their own dword, so the other dword (stencil
 561           * or depth) is preserved. */
 562          if (srcFormat != GL_STENCIL_INDEX)
 563             _mesa_unpack_depth_span(ctx, srcWidth,
 564                                     GL_FLOAT_32_UNSIGNED_INT_24_8_REV, /* dst type */
 565                                     dstRow, /* dst addr */
 566                                     ~0U, srcType, src, srcPacking);
 567
 568          if (srcFormat != GL_DEPTH_COMPONENT)
 569             _mesa_unpack_stencil_span(ctx, srcWidth,
 570                                       GL_FLOAT_32_UNSIGNED_INT_24_8_REV, /* dst type */
 571                                       dstRow, /* dst addr */
 572                                       srcType, src, srcPacking,
 573                                       ctx->_ImageTransferState);
 574
 575          src += srcRowStride;
 576          dstRow += dstRowStride / sizeof(uint64_t);
 577       }
 578    }
 579    return GL_TRUE;
 580 }
 581
 582 static GLboolean
 583 texstore_depth_stencil(TEXSTORE_PARAMS)
 584 {
 585    static StoreTexImageFunc table[MESA_FORMAT_COUNT];
 586    static GLboolean initialized = GL_FALSE;
 587
 588    if (!initialized) {
 589       memset(table, 0, sizeof table);
 590
 591       table[MESA_FORMAT_S8_UINT_Z24_UNORM] = _mesa_texstore_z24_s8;
 592       table[MESA_FORMAT_Z24_UNORM_S8_UINT] = _mesa_texstore_s8_z24;
 593       table[MESA_FORMAT_Z_UNORM16] = _mesa_texstore_z16;
 594       table[MESA_FORMAT_Z24_UNORM_X8_UINT] = _mesa_texstore_x8_z24;
 595       table[MESA_FORMAT_X8_UINT_Z24_UNORM] = _mesa_texstore_z24_x8;
 596       table[MESA_FORMAT_Z_UNORM32] = _mesa_texstore_z32;
 597       table[MESA_FORMAT_S_UINT8] = _mesa_texstore_s8;
 598       table[MESA_FORMAT_Z_FLOAT32] = _mesa_texstore_z32;
 599       table[MESA_FORMAT_Z32_FLOAT_S8X24_UINT] = _mesa_texstore_z32f_x24s8;
 600
 601       initialized = GL_TRUE;
 602    }
 603
 604    assert(table[dstFormat]);
 605    return table[dstFormat](ctx, dims, baseInternalFormat,
 606                            dstFormat, dstRowStride, dstSlices,
 607                            srcWidth, srcHeight, srcDepth,
 608                            srcFormat, srcType, srcAddr, srcPacking);
 609 }
 610
 611 static GLboolean
 612 texstore_compressed(TEXSTORE_PARAMS)
 613 {
 614    static StoreTexImageFunc table[MESA_FORMAT_COUNT];
 615    static GLboolean initialized = GL_FALSE;
 616
 617    if (!initialized) {
 618       memset(table, 0, sizeof table);
 619
 620       table[MESA_FORMAT_SRGB_DXT1] = _mesa_texstore_rgb_dxt1;
 621       table[MESA_FORMAT_SRGBA_DXT1] = _mesa_texstore_rgba_dxt1;
 622       table[MESA_FORMAT_SRGBA_DXT3] = _mesa_texstore_rgba_dxt3;
 623       table[MESA_FORMAT_SRGBA_DXT5] = _mesa_texstore_rgba_dxt5;
 624       table[MESA_FORMAT_RGB_FXT1] = _mesa_texstore_rgb_fxt1;
 625       table[MESA_FORMAT_RGBA_FXT1] = _mesa_texstore_rgba_fxt1;
 626       table[MESA_FORMAT_RGB_DXT1] = _mesa_texstore_rgb_dxt1;
 627       table[MESA_FORMAT_RGBA_DXT1] = _mesa_texstore_rgba_dxt1;
 628       table[MESA_FORMAT_RGBA_DXT3] = _mesa_texstore_rgba_dxt3;
 629       table[MESA_FORMAT_RGBA_DXT5] = _mesa_texstore_rgba_dxt5;
 630       table[MESA_FORMAT_R_RGTC1_UNORM] = _mesa_texstore_red_rgtc1;
 631       table[MESA_FORMAT_R_RGTC1_SNORM] = _mesa_texstore_signed_red_rgtc1;
 632       table[MESA_FORMAT_RG_RGTC2_UNORM] = _mesa_texstore_rg_rgtc2;
 633       table[MESA_FORMAT_RG_RGTC2_SNORM] = _mesa_texstore_signed_rg_rgtc2;
 634       table[MESA_FORMAT_L_LATC1_UNORM] = _mesa_texstore_red_rgtc1;
 635       table[MESA_FORMAT_L_LATC1_SNORM] = _mesa_texstore_signed_red_rgtc1;
 636       table[MESA_FORMAT_LA_LATC2_UNORM] = _mesa_texstore_rg_rgtc2;
 637       table[MESA_FORMAT_LA_LATC2_SNORM] = _mesa_texstore_signed_rg_rgtc2;
 638       table[MESA_FORMAT_ETC1_RGB8] = _mesa_texstore_etc1_rgb8;
 639       table[MESA_FORMAT_ETC2_RGB8] = _mesa_texstore_etc2_rgb8;
 640       table[MESA_FORMAT_ETC2_SRGB8] = _mesa_texstore_etc2_srgb8;
 641       table[MESA_FORMAT_ETC2_RGBA8_EAC] = _mesa_texstore_etc2_rgba8_eac;
 642       table[MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC] = _mesa_texstore_etc2_srgb8_alpha8_eac;
 643       table[MESA_FORMAT_ETC2_R11_EAC] = _mesa_texstore_etc2_r11_eac;
 644       table[MESA_FORMAT_ETC2_RG11_EAC] = _mesa_texstore_etc2_rg11_eac;
 645       table[MESA_FORMAT_ETC2_SIGNED_R11_EAC] = _mesa_texstore_etc2_signed_r11_eac;
 646       table[MESA_FORMAT_ETC2_SIGNED_RG11_EAC] = _mesa_texstore_etc2_signed_rg11_eac;
 647       table[MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1] =
 648          _mesa_texstore_etc2_rgb8_punchthrough_alpha1;
 649       table[MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1] =
 650          _mesa_texstore_etc2_srgb8_punchthrough_alpha1;
 651
 652       table[MESA_FORMAT_BPTC_RGBA_UNORM] =
 653          _mesa_texstore_bptc_rgba_unorm;
 654       table[MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM] =
 655          _mesa_texstore_bptc_rgba_unorm;
 656       table[MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT] =
 657          _mesa_texstore_bptc_rgb_signed_float;
 658       table[MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT] =
 659          _mesa_texstore_bptc_rgb_unsigned_float;
 660
 661       initialized = GL_TRUE;
 662    }
 663
 664    assert(table[dstFormat]);
 665    return table[dstFormat](ctx, dims, baseInternalFormat,
 666                            dstFormat, dstRowStride, dstSlices,
 667                            srcWidth, srcHeight, srcDepth,
 668                            srcFormat, srcType, srcAddr, srcPacking);
 669 }
 670
 671 static GLboolean
 672 texstore_rgba(TEXSTORE_PARAMS)
 673 {
 674    void *tempImage = NULL;
 675    int img;
 676    GLubyte *src, *dst;
 677    uint8_t rebaseSwizzle[4];
 678    bool transferOpsDone = false;
 679
 680    /* We have to handle MESA_FORMAT_YCBCR manually because it is a special case
 681     * and _mesa_format_convert does not support it. In this case the we only
 682     * allow conversions between YCBCR formats and it is mostly a memcpy.
 683     */
 684    if (dstFormat == MESA_FORMAT_YCBCR || dstFormat == MESA_FORMAT_YCBCR_REV) {
 685       return _mesa_texstore_ycbcr(ctx, dims, baseInternalFormat,
 686                                   dstFormat, dstRowStride, dstSlices,
 687                                   srcWidth, srcHeight, srcDepth,
 688                                   srcFormat, srcType, srcAddr,
 689                                   srcPacking);
 690    }
 691
 692    /* We have to deal with GL_COLOR_INDEX manually because
 693     * _mesa_format_convert does not handle this format. So what we do here is
 694     * convert it to RGBA ubyte first and then convert from that to dst as usual.
 695     */
 696    if (srcFormat == GL_COLOR_INDEX) {
 697       /* Notice that this will already handle byte swapping if necessary */
 698       tempImage =
 699          _mesa_unpack_color_index_to_rgba_ubyte(ctx, dims,
 700                                                 srcAddr, srcFormat, srcType,
 701                                                 srcWidth, srcHeight, srcDepth,
 702                                                 srcPacking,
 703                                                 ctx->_ImageTransferState);
 704       if (!tempImage)
 705          return GL_FALSE;
 706
 707       /* _mesa_unpack_color_index_to_rgba_ubyte has handled transferops
 708        * if needed.
 709        */
 710       transferOpsDone = true;
 711
 712       /* Now we only have to adjust our src info for a conversion from
 713        * the RGBA ubyte and then we continue as usual.
 714        */
 715       srcAddr = tempImage;
 716       srcFormat = GL_RGBA;
 717       srcType = GL_UNSIGNED_BYTE;
 718    } else if (srcPacking->SwapBytes) {
 719       /* We have to handle byte-swapping scenarios before calling
 720        * _mesa_format_convert
 721        */
 722       GLint swapSize = _mesa_sizeof_packed_type(srcType);
 723       if (swapSize == 2 || swapSize == 4) {
 724          int imageStride = _mesa_image_image_stride(srcPacking, srcWidth,
 725                                                     srcHeight, srcFormat,
 726                                                     srcType);
 727          int bufferSize = imageStride * srcDepth;
 728          int layer;
 729          const uint8_t *src;
 730          uint8_t *dst;
 731
 732          tempImage = malloc(bufferSize);
 733          if (!tempImage)
 734             return GL_FALSE;
 735          src = srcAddr;
 736          dst = tempImage;
 737          for (layer = 0; layer < srcDepth; layer++) {
 738             _mesa_swap_bytes_2d_image(srcFormat, srcType,
 739                                       srcPacking,
 740                                       srcWidth, srcHeight,
 741                                       dst, src);
 742             src += imageStride;
 743             dst += imageStride;
 744          }
 745          srcAddr = tempImage;
 746       }
 747    }
 748
 749    int srcRowStride =
 750       _mesa_image_row_stride(srcPacking, srcWidth, srcFormat, srcType);
 751
 752    uint32_t srcMesaFormat =
 753       _mesa_format_from_format_and_type(srcFormat, srcType);
 754
 755    dstFormat = _mesa_get_srgb_format_linear(dstFormat);
 756
 757    /* If we have transferOps then we need to convert to RGBA float first,
 758       then apply transferOps, then do the conversion to dst
 759     */
 760    void *tempRGBA = NULL;
 761    if (!transferOpsDone &&
 762        _mesa_texstore_needs_transfer_ops(ctx, baseInternalFormat, dstFormat)) {
 763       /* Allocate RGBA float image */
 764       int elementCount = srcWidth * srcHeight * srcDepth;
 765       tempRGBA = malloc(4 * elementCount * sizeof(float));
 766       if (!tempRGBA) {
 767          free(tempImage);
 768          return GL_FALSE;
 769       }
 770
 771       /* Convert from src to RGBA float */
 772       src = (GLubyte *) srcAddr;
 773       dst = (GLubyte *) tempRGBA;
 774       for (img = 0; img < srcDepth; img++) {
 775          _mesa_format_convert(dst, RGBA32_FLOAT, 4 * srcWidth * sizeof(float),
 776                               src, srcMesaFormat, srcRowStride,
 777                               srcWidth, srcHeight, NULL);
 778          src += srcHeight * srcRowStride;
 779          dst += srcHeight * 4 * srcWidth * sizeof(float);
 780       }
 781
 782       /* Apply transferOps */
 783       _mesa_apply_rgba_transfer_ops(ctx, ctx->_ImageTransferState, elementCount,
 784                                     (float(*)[4]) tempRGBA);
 785
 786       /* Now we have to adjust our src info for a conversion from
 787        * the RGBA float image and then we continue as usual.
 788        */
 789       srcAddr = tempRGBA;
 790       srcFormat = GL_RGBA;
 791       srcType = GL_FLOAT;
 792       srcRowStride = srcWidth * 4 * sizeof(float);
 793       srcMesaFormat = RGBA32_FLOAT;
 794       srcPacking = &ctx->DefaultPacking;
 795    }
 796
 797    src = (GLubyte *)
 798       _mesa_image_address(dims, srcPacking, srcAddr, srcWidth, srcHeight,
 799                           srcFormat, srcType, 0, 0, 0);
 800
 801    bool needRebase;
 802    if (_mesa_get_format_base_format(dstFormat) != baseInternalFormat) {
 803       needRebase =
 804          _mesa_compute_rgba2base2rgba_component_mapping(baseInternalFormat,
 805                                                         rebaseSwizzle);
 806    } else {
 807       needRebase = false;
 808    }
 809
 810    for (img = 0; img < srcDepth; img++) {
 811       _mesa_format_convert(dstSlices[img], dstFormat, dstRowStride,
 812                            src, srcMesaFormat, srcRowStride,
 813                            srcWidth, srcHeight,
 814                            needRebase ? rebaseSwizzle : NULL);
 815       src += srcHeight * srcRowStride;
 816    }
 817
 818    free(tempImage);
 819    free(tempRGBA);
 820
 821    return GL_TRUE;
 822 }
 823
 824 GLboolean
 825 _mesa_texstore_needs_transfer_ops(struct gl_context *ctx,
 826                                   GLenum baseInternalFormat,
 827                                   mesa_format dstFormat)
 828 {
 829    GLenum dstType;
 830
 831    /* There are different rules depending on the base format. */
 832    switch (baseInternalFormat) {
 833    case GL_DEPTH_COMPONENT:
 834    case GL_DEPTH_STENCIL:
 835       return ctx->Pixel.DepthScale != 1.0f ||
 836              ctx->Pixel.DepthBias != 0.0f;
 837
 838    case GL_STENCIL_INDEX:
 839       return GL_FALSE;
 840
 841    default:
 842       /* Color formats.
 843        * Pixel transfer ops (scale, bias, table lookup) do not apply
 844        * to integer formats.
 845        */
 846       dstType = _mesa_get_format_datatype(dstFormat);
 847
 848       return dstType != GL_INT && dstType != GL_UNSIGNED_INT &&
 849              ctx->_ImageTransferState;
 850    }
 851 }
 852
 853
 854 GLboolean
 855 _mesa_texstore_can_use_memcpy(struct gl_context *ctx,
 856                               GLenum baseInternalFormat, mesa_format dstFormat,
 857                               GLenum srcFormat, GLenum srcType,
 858                               const struct gl_pixelstore_attrib *srcPacking)
 859 {
 860    if (_mesa_texstore_needs_transfer_ops(ctx, baseInternalFormat, dstFormat)) {
 861       return GL_FALSE;
 862    }
 863
 864    /* The base internal format and the base Mesa format must match. */
 865    if (baseInternalFormat != _mesa_get_format_base_format(dstFormat)) {
 866       return GL_FALSE;
 867    }
 868
 869    /* The Mesa format must match the input format and type. */
 870    if (!_mesa_format_matches_format_and_type(dstFormat, srcFormat, srcType,
 871                                              srcPacking->SwapBytes, NULL)) {
 872       return GL_FALSE;
 873    }
 874
 875    /* Depth texture data needs clamping in following cases:
 876     * - Floating point dstFormat with signed srcType: clamp to [0.0, 1.0].
 877     * - Fixed point dstFormat with signed srcType: clamp to [0, 2^n -1].
 878     *
 879     * All the cases except one (float dstFormat with float srcType) are ruled
 880     * out by _mesa_format_matches_format_and_type() check above. Handle the
 881     * remaining case here.
 882     */
 883    if ((baseInternalFormat == GL_DEPTH_COMPONENT ||
 884         baseInternalFormat == GL_DEPTH_STENCIL) &&
 885        (srcType == GL_FLOAT ||
 886         srcType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV)) {
 887       return GL_FALSE;
 888    }
 889
 890    return GL_TRUE;
 891 }
 892
 893 static GLboolean
 894 _mesa_texstore_memcpy(TEXSTORE_PARAMS)
 895 {
 896    if (!_mesa_texstore_can_use_memcpy(ctx, baseInternalFormat, dstFormat,
 897                                       srcFormat, srcType, srcPacking)) {
 898       return GL_FALSE;
 899    }
 900
 901    _mesa_memcpy_texture(ctx, dims,
 902                         dstFormat,
 903                         dstRowStride, dstSlices,
 904                         srcWidth, srcHeight, srcDepth, srcFormat, srcType,
 905                         srcAddr, srcPacking);
 906    return GL_TRUE;
 907 }
 908
 909
 910 /**
 911  * Store user data into texture memory.
 912  * Called via glTex[Sub]Image1/2/3D()
 913  * \return GL_TRUE for success, GL_FALSE for failure (out of memory).
 914  */
 915 GLboolean
 916 _mesa_texstore(TEXSTORE_PARAMS)
 917 {
 918    if (_mesa_texstore_memcpy(ctx, dims, baseInternalFormat,
 919                              dstFormat,
 920                              dstRowStride, dstSlices,
 921                              srcWidth, srcHeight, srcDepth,
 922                              srcFormat, srcType, srcAddr, srcPacking)) {
 923       return GL_TRUE;
 924    }
 925
 926    if (_mesa_is_depth_or_stencil_format(baseInternalFormat)) {
 927       return texstore_depth_stencil(ctx, dims, baseInternalFormat,
 928                                     dstFormat, dstRowStride, dstSlices,
 929                                     srcWidth, srcHeight, srcDepth,
 930                                     srcFormat, srcType, srcAddr, srcPacking);
 931    } else if (_mesa_is_format_compressed(dstFormat)) {
 932       return texstore_compressed(ctx, dims, baseInternalFormat,
 933                                  dstFormat, dstRowStride, dstSlices,
 934                                  srcWidth, srcHeight, srcDepth,
 935                                  srcFormat, srcType, srcAddr, srcPacking);
 936    } else {
 937       return texstore_rgba(ctx, dims, baseInternalFormat,
 938                            dstFormat, dstRowStride, dstSlices,
 939                            srcWidth, srcHeight, srcDepth,
 940                            srcFormat, srcType, srcAddr, srcPacking);
 941    }
 942 }
 943
 944
 945 /**
 946  * Normally, we'll only _write_ texel data to a texture when we map it.
 947  * But if the user is providing depth or stencil values and the texture
 948  * image is a combined depth/stencil format, we'll actually read from
 949  * the texture buffer too (in order to insert the depth or stencil values.
 950  * \param userFormat  the user-provided image format
 951  * \param texFormat  the destination texture format
 952  */
 953 static GLbitfield
 954 get_read_write_mode(GLenum userFormat, mesa_format texFormat)
 955 {
 956    if ((userFormat == GL_STENCIL_INDEX || userFormat == GL_DEPTH_COMPONENT)
 957        && _mesa_get_format_base_format(texFormat) == GL_DEPTH_STENCIL)
 958       return GL_MAP_READ_BIT | GL_MAP_WRITE_BIT;
 959    else
 960       return GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_RANGE_BIT;
 961 }
 962
 963
 964 /**
 965  * Helper function for storing 1D, 2D, 3D whole and subimages into texture
 966  * memory.
 967  * The source of the image data may be user memory or a PBO.  In the later
 968  * case, we'll map the PBO, copy from it, then unmap it.
 969  */
 970 static void
 971 store_texsubimage(struct gl_context *ctx,
 972                   struct gl_texture_image *texImage,
 973                   GLint xoffset, GLint yoffset, GLint zoffset,
 974                   GLint width, GLint height, GLint depth,
 975                   GLenum format, GLenum type, const GLvoid *pixels,
 976                   const struct gl_pixelstore_attrib *packing,
 977                   const char *caller)
 978
 979 {
 980    const GLbitfield mapMode = get_read_write_mode(format, texImage->TexFormat);
 981    const GLenum target = texImage->TexObject->Target;
 982    GLboolean success = GL_FALSE;
 983    GLuint dims, slice, numSlices = 1, sliceOffset = 0;
 984    GLint srcImageStride = 0;
 985    const GLubyte *src;
 986
 987    assert(xoffset + width <= texImage->Width);
 988    assert(yoffset + height <= texImage->Height);
 989    assert(zoffset + depth <= texImage->Depth);
 990
 991    switch (target) {
 992    case GL_TEXTURE_1D:
 993       dims = 1;
 994       break;
 995    case GL_TEXTURE_2D_ARRAY:
 996    case GL_TEXTURE_CUBE_MAP_ARRAY:
 997    case GL_TEXTURE_3D:
 998       dims = 3;
 999       break;
1000    default:
1001       dims = 2;
1002    }
1003
1004    /* get pointer to src pixels (may be in a pbo which we'll map here) */
1005    src = (const GLubyte *)
1006       _mesa_validate_pbo_teximage(ctx, dims, width, height, depth,
1007                                   format, type, pixels, packing, caller);
1008    if (!src)
1009       return;
1010
1011    /* compute slice info (and do some sanity checks) */
1012    switch (target) {
1013    case GL_TEXTURE_2D:
1014    case GL_TEXTURE_2D_MULTISAMPLE:
1015    case GL_TEXTURE_RECTANGLE:
1016    case GL_TEXTURE_CUBE_MAP:
1017    case GL_TEXTURE_EXTERNAL_OES:
1018       /* one image slice, nothing special needs to be done */
1019       break;
1020    case GL_TEXTURE_1D:
1021       assert(height == 1);
1022       assert(depth == 1);
1023       assert(yoffset == 0);
1024       assert(zoffset == 0);
1025       break;
1026    case GL_TEXTURE_1D_ARRAY:
1027       assert(depth == 1);
1028       assert(zoffset == 0);
1029       numSlices = height;
1030       sliceOffset = yoffset;
1031       height = 1;
1032       yoffset = 0;
1033       srcImageStride = _mesa_image_row_stride(packing, width, format, type);
1034       break;
1035    case GL_TEXTURE_2D_ARRAY:
1036    case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
1037       numSlices = depth;
1038       sliceOffset = zoffset;
1039       depth = 1;
1040       zoffset = 0;
1041       srcImageStride = _mesa_image_image_stride(packing, width, height,
1042                                                 format, type);
1043       break;
1044    case GL_TEXTURE_3D:
1045       /* we'll store 3D images as a series of slices */
1046       numSlices = depth;
1047       sliceOffset = zoffset;
1048       srcImageStride = _mesa_image_image_stride(packing, width, height,
1049                                                 format, type);
1050       break;
1051    case GL_TEXTURE_CUBE_MAP_ARRAY:
1052       numSlices = depth;
1053       sliceOffset = zoffset;
1054       srcImageStride = _mesa_image_image_stride(packing, width, height,
1055                                                 format, type);
1056       break;
1057    default:
1058       _mesa_warning(ctx, "Unexpected target 0x%x in store_texsubimage()",
1059                     target);
1060       return;
1061    }
1062
1063    assert(numSlices == 1 || srcImageStride != 0);
1064
1065    for (slice = 0; slice < numSlices; slice++) {
1066       GLubyte *dstMap;
1067       GLint dstRowStride;
1068
1069       ctx->Driver.MapTextureImage(ctx, texImage,
1070                                   slice + sliceOffset,
1071                                   xoffset, yoffset, width, height,
1072                                   mapMode, &dstMap, &dstRowStride);
1073       if (dstMap) {
1074          /* Note: we're only storing a 2D (or 1D) slice at a time but we need
1075           * to pass the right 'dims' value so that GL_UNPACK_SKIP_IMAGES is
1076           * used for 3D images.
1077           */
1078          success = _mesa_texstore(ctx, dims, texImage->_BaseFormat,
1079                                   texImage->TexFormat,
1080                                   dstRowStride,
1081                                   &dstMap,
1082                                   width, height, 1,  /* w, h, d */
1083                                   format, type, src, packing);
1084
1085          ctx->Driver.UnmapTextureImage(ctx, texImage, slice + sliceOffset);
1086       }
1087
1088       src += srcImageStride;
1089
1090       if (!success)
1091          break;
1092    }
1093
1094    if (!success)
1095       _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", caller);
1096
1097    _mesa_unmap_teximage_pbo(ctx, packing);
1098 }
1099
1100
1101
1102 /**
1103  * Fallback code for ctx->Driver.TexImage().
1104  * Basically, allocate storage for the texture image, then copy the
1105  * user's image into it.
1106  */
1107 void
1108 _mesa_store_teximage(struct gl_context *ctx,
1109                      GLuint dims,
1110                      struct gl_texture_image *texImage,
1111                      GLenum format, GLenum type, const GLvoid *pixels,
1112                      const struct gl_pixelstore_attrib *packing)
1113 {
1114    assert(dims == 1 || dims == 2 || dims == 3);
1115
1116    if (texImage->Width == 0 || texImage->Height == 0 || texImage->Depth == 0)
1117       return;
1118
1119    /* allocate storage for texture data */
1120    if (!ctx->Driver.AllocTextureImageBuffer(ctx, texImage)) {
1121       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glTexImage%uD", dims);
1122       return;
1123    }
1124
1125    store_texsubimage(ctx, texImage,
1126                      0, 0, 0, texImage->Width, texImage->Height, texImage->Depth,
1127                      format, type, pixels, packing, "glTexImage");
1128 }
1129
1130
1131 /*
1132  * Fallback for Driver.TexSubImage().
1133  */
1134 void
1135 _mesa_store_texsubimage(struct gl_context *ctx, GLuint dims,
1136                         struct gl_texture_image *texImage,
1137                         GLint xoffset, GLint yoffset, GLint zoffset,
1138                         GLint width, GLint height, GLint depth,
1139                         GLenum format, GLenum type, const void *pixels,
1140                         const struct gl_pixelstore_attrib *packing)
1141 {
1142    store_texsubimage(ctx, texImage,
1143                      xoffset, yoffset, zoffset, width, height, depth,
1144                      format, type, pixels, packing, "glTexSubImage");
1145 }
1146
1147 static void
1148 clear_image_to_zero(GLubyte *dstMap, GLint dstRowStride,
1149                     GLsizei width, GLsizei height,
1150                     GLsizei clearValueSize)
1151 {
1152    GLsizei y;
1153
1154    for (y = 0; y < height; y++) {
1155       memset(dstMap, 0, clearValueSize * width);
1156       dstMap += dstRowStride;
1157    }
1158 }
1159
1160 static void
1161 clear_image_to_value(GLubyte *dstMap, GLint dstRowStride,
1162                      GLsizei width, GLsizei height,
1163                      const GLvoid *clearValue,
1164                      GLsizei clearValueSize)
1165 {
1166    GLsizei y, x;
1167
1168    for (y = 0; y < height; y++) {
1169       for (x = 0; x < width; x++) {
1170          memcpy(dstMap, clearValue, clearValueSize);
1171          dstMap += clearValueSize;
1172       }
1173       dstMap += dstRowStride - clearValueSize * width;
1174    }
1175 }
1176
1177 /*
1178  * Fallback for Driver.ClearTexSubImage().
1179  */
1180 void
1181 _mesa_store_cleartexsubimage(struct gl_context *ctx,
1182                              struct gl_texture_image *texImage,
1183                              GLint xoffset, GLint yoffset, GLint zoffset,
1184                              GLsizei width, GLsizei height, GLsizei depth,
1185                              const GLvoid *clearValue)
1186 {
1187    GLubyte *dstMap;
1188    GLint dstRowStride;
1189    GLsizeiptr clearValueSize;
1190    GLsizei z;
1191
1192    clearValueSize = _mesa_get_format_bytes(texImage->TexFormat);
1193
1194    for (z = 0; z < depth; z++) {
1195       ctx->Driver.MapTextureImage(ctx, texImage,
1196                                   z + zoffset, xoffset, yoffset,
1197                                   width, height,
1198                                   GL_MAP_WRITE_BIT,
1199                                   &dstMap, &dstRowStride);
1200       if (dstMap == NULL) {
1201          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glClearTex*Image");
1202          return;
1203       }
1204
1205       if (clearValue) {
1206          clear_image_to_value(dstMap, dstRowStride,
1207                               width, height,
1208                               clearValue,
1209                               clearValueSize);
1210       } else {
1211          clear_image_to_zero(dstMap, dstRowStride,
1212                              width, height,
1213                              clearValueSize);
1214       }
1215
1216       ctx->Driver.UnmapTextureImage(ctx, texImage, z + zoffset);
1217    }
1218 }
1219
1220 /**
1221  * Fallback for Driver.CompressedTexImage()
1222  */
1223 void
1224 _mesa_store_compressed_teximage(struct gl_context *ctx, GLuint dims,
1225                                 struct gl_texture_image *texImage,
1226                                 GLsizei imageSize, const GLvoid *data)
1227 {
1228    /* only 2D and 3D compressed images are supported at this time */
1229    if (dims == 1) {
1230       _mesa_problem(ctx, "Unexpected glCompressedTexImage1D call");
1231       return;
1232    }
1233
1234    /* This is pretty simple, because unlike the general texstore path we don't
1235     * have to worry about the usual image unpacking or image transfer
1236     * operations.
1237     */
1238    assert(texImage);
1239    assert(texImage->Width > 0);
1240    assert(texImage->Height > 0);
1241    assert(texImage->Depth > 0);
1242
1243    /* allocate storage for texture data */
1244    if (!ctx->Driver.AllocTextureImageBuffer(ctx, texImage)) {
1245       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCompressedTexImage%uD", dims);
1246       return;
1247    }
1248
1249    ctx->Driver.CompressedTexSubImage(ctx, dims, texImage,
1250                                      0, 0, 0,
1251                                      texImage->Width, texImage->Height, texImage->Depth,
1252                                      texImage->TexFormat,
1253                                      imageSize, data);
1254 }
1255
1256
1257 /**
1258  * Compute compressed_pixelstore parameters for copying compressed
1259  * texture data.
1260  * \param dims  number of texture image dimensions: 1, 2 or 3
1261  * \param texFormat  the compressed texture format
1262  * \param width, height, depth  size of image to copy
1263  * \param packing  pixelstore parameters describing user-space image packing
1264  * \param store  returns the compressed_pixelstore parameters
1265  */
1266 void
1267 _mesa_compute_compressed_pixelstore(GLuint dims, mesa_format texFormat,
1268                                     GLsizei width, GLsizei height,
1269                                     GLsizei depth,
1270                                     const struct gl_pixelstore_attrib *packing,
1271                                     struct compressed_pixelstore *store)
1272 {
1273    GLuint bw, bh, bd;
1274
1275    _mesa_get_format_block_size_3d(texFormat, &bw, &bh, &bd);
1276
1277    store->SkipBytes = 0;
1278    store->TotalBytesPerRow = store->CopyBytesPerRow =
1279          _mesa_format_row_stride(texFormat, width);
1280    store->TotalRowsPerSlice = store->CopyRowsPerSlice =
1281          (height + bh - 1) / bh;
1282    store->CopySlices = (depth + bd - 1) / bd;
1283
1284    if (packing->CompressedBlockWidth &&
1285        packing->CompressedBlockSize) {
1286
1287       bw = packing->CompressedBlockWidth;
1288
1289       if (packing->RowLength) {
1290          store->TotalBytesPerRow = packing->CompressedBlockSize *
1291             ((packing->RowLength + bw - 1) / bw);
1292       }
1293
1294       store->SkipBytes +=
1295          packing->SkipPixels * packing->CompressedBlockSize / bw;
1296    }
1297
1298    if (dims > 1 && packing->CompressedBlockHeight &&
1299        packing->CompressedBlockSize) {
1300
1301       bh = packing->CompressedBlockHeight;
1302
1303       store->SkipBytes += packing->SkipRows * store->TotalBytesPerRow / bh;
1304       store->CopyRowsPerSlice = (height + bh - 1) / bh;  /* rows in blocks */
1305
1306       if (packing->ImageHeight) {
1307          store->TotalRowsPerSlice = (packing->ImageHeight + bh - 1) / bh;
1308       }
1309    }
1310
1311    if (dims > 2 && packing->CompressedBlockDepth &&
1312        packing->CompressedBlockSize) {
1313
1314       int bd = packing->CompressedBlockDepth;
1315
1316       store->SkipBytes += packing->SkipImages * store->TotalBytesPerRow *
1317             store->TotalRowsPerSlice / bd;
1318    }
1319 }
1320
1321
1322 /**
1323  * Fallback for Driver.CompressedTexSubImage()
1324  */
1325 void
1326 _mesa_store_compressed_texsubimage(struct gl_context *ctx, GLuint dims,
1327                                    struct gl_texture_image *texImage,
1328                                    GLint xoffset, GLint yoffset, GLint zoffset,
1329                                    GLsizei width, GLsizei height, GLsizei depth,
1330                                    GLenum format,
1331                                    GLsizei imageSize, const GLvoid *data)
1332 {
1333    struct compressed_pixelstore store;
1334    GLint dstRowStride;
1335    GLint i, slice;
1336    GLubyte *dstMap;
1337    const GLubyte *src;
1338
1339    if (dims == 1) {
1340       _mesa_problem(ctx, "Unexpected 1D compressed texsubimage call");
1341       return;
1342    }
1343
1344    _mesa_compute_compressed_pixelstore(dims, texImage->TexFormat,
1345                                        width, height, depth,
1346                                        &ctx->Unpack, &store);
1347
1348    /* get pointer to src pixels (may be in a pbo which we'll map here) */
1349    data = _mesa_validate_pbo_compressed_teximage(ctx, dims, imageSize, data,
1350                                                  &ctx->Unpack,
1351                                                  "glCompressedTexSubImage");
1352    if (!data)
1353       return;
1354
1355    src = (const GLubyte *) data + store.SkipBytes;
1356
1357    for (slice = 0; slice < store.CopySlices; slice++) {
1358       /* Map dest texture buffer */
1359       ctx->Driver.MapTextureImage(ctx, texImage, slice + zoffset,
1360                                   xoffset, yoffset, width, height,
1361                                   GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_RANGE_BIT,
1362                                   &dstMap, &dstRowStride);
1363
1364       if (dstMap) {
1365
1366          /* copy rows of blocks */
1367          if (dstRowStride == store.TotalBytesPerRow &&
1368              dstRowStride == store.CopyBytesPerRow) {
1369             memcpy(dstMap, src, store.CopyBytesPerRow * store.CopyRowsPerSlice);
1370             src += store.CopyBytesPerRow * store.CopyRowsPerSlice;
1371          }
1372          else {
1373             for (i = 0; i < store.CopyRowsPerSlice; i++) {
1374                memcpy(dstMap, src, store.CopyBytesPerRow);
1375                dstMap += dstRowStride;
1376                src += store.TotalBytesPerRow;
1377             }
1378          }
1379
1380          ctx->Driver.UnmapTextureImage(ctx, texImage, slice + zoffset);
1381
1382          /* advance to next slice */
1383          src += store.TotalBytesPerRow * (store.TotalRowsPerSlice
1384                                           - store.CopyRowsPerSlice);
1385       }
1386       else {
1387          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCompressedTexSubImage%uD",
1388                      dims);
1389       }
1390    }
1391
1392    _mesa_unmap_teximage_pbo(ctx, &ctx->Unpack);
1393 }