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 "glheader.h"
  55 #include "bufferobj.h"
  56 #include "colormac.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 #include "imports.h"
  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 "../../gallium/auxiliary/util/u_format_rgb9e5.h"
  77 #include "../../gallium/auxiliary/util/u_format_r11g11b10f.h"
  78
  79
  80 enum {
  81    ZERO = 4,
  82    ONE = 5
  83 };
  84
  85
  86 /**
  87  * Texture image storage function.
  88  */
  89 typedef GLboolean (*StoreTexImageFunc)(TEXSTORE_PARAMS);
  90 static const GLubyte map_identity[6] = { 0, 1, 2, 3, ZERO, ONE };
  91 static const GLubyte map_3210[6] = { 3, 2, 1, 0, ZERO, ONE };
  92 static const GLubyte map_1032[6] = { 1, 0, 3, 2, ZERO, ONE };
  93
  94
  95 /**
  96  * Teximage storage routine for when a simple memcpy will do.
  97  * No pixel transfer operations or special texel encodings allowed.
  98  * 1D, 2D and 3D images supported.
  99  */
 100 static void
 101 memcpy_texture(struct gl_context *ctx,
 102                GLuint dimensions,
 103                mesa_format dstFormat,
 104                GLint dstRowStride,
 105                GLubyte **dstSlices,
 106                GLint srcWidth, GLint srcHeight, GLint srcDepth,
 107                GLenum srcFormat, GLenum srcType,
 108                const GLvoid *srcAddr,
 109                const struct gl_pixelstore_attrib *srcPacking)
 110 {
 111    const GLint srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth,
 112                                                      srcFormat, srcType);
 113    const GLint srcImageStride = _mesa_image_image_stride(srcPacking,
 114                                       srcWidth, srcHeight, srcFormat, srcType);
 115    const GLubyte *srcImage = (const GLubyte *) _mesa_image_address(dimensions,
 116         srcPacking, srcAddr, srcWidth, srcHeight, srcFormat, srcType, 0, 0, 0);
 117    const GLuint texelBytes = _mesa_get_format_bytes(dstFormat);
 118    const GLint bytesPerRow = srcWidth * texelBytes;
 119
 120    if (dstRowStride == srcRowStride &&
 121        dstRowStride == bytesPerRow) {
 122       /* memcpy image by image */
 123       GLint img;
 124       for (img = 0; img < srcDepth; img++) {
 125          GLubyte *dstImage = dstSlices[img];
 126          memcpy(dstImage, srcImage, bytesPerRow * srcHeight);
 127          srcImage += srcImageStride;
 128       }
 129    }
 130    else {
 131       /* memcpy row by row */
 132       GLint img, row;
 133       for (img = 0; img < srcDepth; img++) {
 134          const GLubyte *srcRow = srcImage;
 135          GLubyte *dstRow = dstSlices[img];
 136          for (row = 0; row < srcHeight; row++) {
 137             memcpy(dstRow, srcRow, bytesPerRow);
 138             dstRow += dstRowStride;
 139             srcRow += srcRowStride;
 140          }
 141          srcImage += srcImageStride;
 142       }
 143    }
 144 }
 145
 146
 147 /**
 148  * Store a 32-bit integer or float depth component texture image.
 149  */
 150 static GLboolean
 151 _mesa_texstore_z32(TEXSTORE_PARAMS)
 152 {
 153    const GLuint depthScale = 0xffffffff;
 154    GLenum dstType;
 155    (void) dims;
 156    ASSERT(dstFormat == MESA_FORMAT_Z_UNORM32 ||
 157           dstFormat == MESA_FORMAT_Z_FLOAT32);
 158    ASSERT(_mesa_get_format_bytes(dstFormat) == sizeof(GLuint));
 159
 160    if (dstFormat == MESA_FORMAT_Z_UNORM32)
 161       dstType = GL_UNSIGNED_INT;
 162    else
 163       dstType = GL_FLOAT;
 164
 165    {
 166       /* general path */
 167       GLint img, row;
 168       for (img = 0; img < srcDepth; img++) {
 169          GLubyte *dstRow = dstSlices[img];
 170          for (row = 0; row < srcHeight; row++) {
 171             const GLvoid *src = _mesa_image_address(dims, srcPacking,
 172                 srcAddr, srcWidth, srcHeight, srcFormat, srcType, img, row, 0);
 173             _mesa_unpack_depth_span(ctx, srcWidth,
 174                                     dstType, dstRow,
 175                                     depthScale, srcType, src, srcPacking);
 176             dstRow += dstRowStride;
 177          }
 178       }
 179    }
 180    return GL_TRUE;
 181 }
 182
 183
 184 /**
 185  * Store a 24-bit integer depth component texture image.
 186  */
 187 static GLboolean
 188 _mesa_texstore_x8_z24(TEXSTORE_PARAMS)
 189 {
 190    const GLuint depthScale = 0xffffff;
 191
 192    (void) dims;
 193    ASSERT(dstFormat == MESA_FORMAT_Z24_UNORM_X8_UINT);
 194
 195    {
 196       /* general path */
 197       GLint img, row;
 198       for (img = 0; img < srcDepth; img++) {
 199          GLubyte *dstRow = dstSlices[img];
 200          for (row = 0; row < srcHeight; row++) {
 201             const GLvoid *src = _mesa_image_address(dims, srcPacking,
 202                 srcAddr, srcWidth, srcHeight, srcFormat, srcType, img, row, 0);
 203             _mesa_unpack_depth_span(ctx, srcWidth,
 204                                     GL_UNSIGNED_INT, (GLuint *) dstRow,
 205                                     depthScale, srcType, src, srcPacking);
 206             dstRow += dstRowStride;
 207          }
 208       }
 209    }
 210    return GL_TRUE;
 211 }
 212
 213
 214 /**
 215  * Store a 24-bit integer depth component texture image.
 216  */
 217 static GLboolean
 218 _mesa_texstore_z24_x8(TEXSTORE_PARAMS)
 219 {
 220    const GLuint depthScale = 0xffffff;
 221
 222    (void) dims;
 223    ASSERT(dstFormat == MESA_FORMAT_X8_UINT_Z24_UNORM);
 224
 225    {
 226       /* general path */
 227       GLint img, row;
 228       for (img = 0; img < srcDepth; img++) {
 229          GLubyte *dstRow = dstSlices[img];
 230          for (row = 0; row < srcHeight; row++) {
 231             const GLvoid *src = _mesa_image_address(dims, srcPacking,
 232                 srcAddr, srcWidth, srcHeight, srcFormat, srcType, img, row, 0);
 233             GLuint *dst = (GLuint *) dstRow;
 234             GLint i;
 235             _mesa_unpack_depth_span(ctx, srcWidth,
 236                                     GL_UNSIGNED_INT, dst,
 237                                     depthScale, srcType, src, srcPacking);
 238             for (i = 0; i < srcWidth; i++)
 239                dst[i] <<= 8;
 240             dstRow += dstRowStride;
 241          }
 242       }
 243    }
 244    return GL_TRUE;
 245 }
 246
 247
 248 /**
 249  * Store a 16-bit integer depth component texture image.
 250  */
 251 static GLboolean
 252 _mesa_texstore_z16(TEXSTORE_PARAMS)
 253 {
 254    const GLuint depthScale = 0xffff;
 255    (void) dims;
 256    ASSERT(dstFormat == MESA_FORMAT_Z_UNORM16);
 257    ASSERT(_mesa_get_format_bytes(dstFormat) == sizeof(GLushort));
 258
 259    {
 260       /* general path */
 261       GLint img, row;
 262       for (img = 0; img < srcDepth; img++) {
 263          GLubyte *dstRow = dstSlices[img];
 264          for (row = 0; row < srcHeight; row++) {
 265             const GLvoid *src = _mesa_image_address(dims, srcPacking,
 266                 srcAddr, srcWidth, srcHeight, srcFormat, srcType, img, row, 0);
 267             GLushort *dst16 = (GLushort *) dstRow;
 268             _mesa_unpack_depth_span(ctx, srcWidth,
 269                                     GL_UNSIGNED_SHORT, dst16, depthScale,
 270                                     srcType, src, srcPacking);
 271             dstRow += dstRowStride;
 272          }
 273       }
 274    }
 275    return GL_TRUE;
 276 }
 277
 278
 279 /**
 280  * Texstore for _mesa_texformat_ycbcr or _mesa_texformat_ycbcr_REV.
 281  */
 282 static GLboolean
 283 _mesa_texstore_ycbcr(TEXSTORE_PARAMS)
 284 {
 285    const GLboolean littleEndian = _mesa_little_endian();
 286
 287    (void) ctx; (void) dims; (void) baseInternalFormat;
 288
 289    ASSERT((dstFormat == MESA_FORMAT_YCBCR) ||
 290           (dstFormat == MESA_FORMAT_YCBCR_REV));
 291    ASSERT(_mesa_get_format_bytes(dstFormat) == 2);
 292    ASSERT(ctx->Extensions.MESA_ycbcr_texture);
 293    ASSERT(srcFormat == GL_YCBCR_MESA);
 294    ASSERT((srcType == GL_UNSIGNED_SHORT_8_8_MESA) ||
 295           (srcType == GL_UNSIGNED_SHORT_8_8_REV_MESA));
 296    ASSERT(baseInternalFormat == GL_YCBCR_MESA);
 297
 298    /* always just memcpy since no pixel transfer ops apply */
 299    memcpy_texture(ctx, dims,
 300                   dstFormat,
 301                   dstRowStride, dstSlices,
 302                   srcWidth, srcHeight, srcDepth, srcFormat, srcType,
 303                   srcAddr, srcPacking);
 304
 305    /* Check if we need byte swapping */
 306    /* XXX the logic here _might_ be wrong */
 307    if (srcPacking->SwapBytes ^
 308        (srcType == GL_UNSIGNED_SHORT_8_8_REV_MESA) ^
 309        (dstFormat == MESA_FORMAT_YCBCR_REV) ^
 310        !littleEndian) {
 311       GLint img, row;
 312       for (img = 0; img < srcDepth; img++) {
 313          GLubyte *dstRow = dstSlices[img];
 314          for (row = 0; row < srcHeight; row++) {
 315             _mesa_swap2((GLushort *) dstRow, srcWidth);
 316             dstRow += dstRowStride;
 317          }
 318       }
 319    }
 320    return GL_TRUE;
 321 }
 322
 323
 324 /**
 325  * Store a combined depth/stencil texture image.
 326  */
 327 static GLboolean
 328 _mesa_texstore_z24_s8(TEXSTORE_PARAMS)
 329 {
 330    const GLuint depthScale = 0xffffff;
 331    const GLint srcRowStride
 332       = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat, srcType);
 333    GLint img, row;
 334    GLuint *depth = malloc(srcWidth * sizeof(GLuint));
 335    GLubyte *stencil = malloc(srcWidth * sizeof(GLubyte));
 336
 337    ASSERT(dstFormat == MESA_FORMAT_S8_UINT_Z24_UNORM);
 338    ASSERT(srcFormat == GL_DEPTH_STENCIL_EXT ||
 339           srcFormat == GL_DEPTH_COMPONENT ||
 340           srcFormat == GL_STENCIL_INDEX);
 341    ASSERT(srcFormat != GL_DEPTH_STENCIL_EXT ||
 342           srcType == GL_UNSIGNED_INT_24_8_EXT ||
 343           srcType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
 344
 345    if (!depth || !stencil) {
 346       free(depth);
 347       free(stencil);
 348       return GL_FALSE;
 349    }
 350
 351    /* In case we only upload depth we need to preserve the stencil */
 352    for (img = 0; img < srcDepth; img++) {
 353       GLuint *dstRow = (GLuint *) dstSlices[img];
 354       const GLubyte *src
 355          = (const GLubyte *) _mesa_image_address(dims, srcPacking, srcAddr,
 356                srcWidth, srcHeight,
 357                srcFormat, srcType,
 358                img, 0, 0);
 359       for (row = 0; row < srcHeight; row++) {
 360          GLint i;
 361          GLboolean keepdepth = GL_FALSE, keepstencil = GL_FALSE;
 362
 363          if (srcFormat == GL_DEPTH_COMPONENT) { /* preserve stencil */
 364             keepstencil = GL_TRUE;
 365          }
 366          else if (srcFormat == GL_STENCIL_INDEX) { /* preserve depth */
 367             keepdepth = GL_TRUE;
 368          }
 369
 370          if (keepdepth == GL_FALSE)
 371             /* the 24 depth bits will be in the low position: */
 372             _mesa_unpack_depth_span(ctx, srcWidth,
 373                                     GL_UNSIGNED_INT, /* dst type */
 374                                     keepstencil ? depth : dstRow, /* dst addr */
 375                                     depthScale,
 376                                     srcType, src, srcPacking);
 377
 378          if (keepstencil == GL_FALSE)
 379             /* get the 8-bit stencil values */
 380             _mesa_unpack_stencil_span(ctx, srcWidth,
 381                                       GL_UNSIGNED_BYTE, /* dst type */
 382                                       stencil, /* dst addr */
 383                                       srcType, src, srcPacking,
 384                                       ctx->_ImageTransferState);
 385
 386          for (i = 0; i < srcWidth; i++) {
 387             if (keepstencil)
 388                dstRow[i] = depth[i] << 8 | (dstRow[i] & 0x000000FF);
 389             else
 390                dstRow[i] = (dstRow[i] & 0xFFFFFF00) | (stencil[i] & 0xFF);
 391          }
 392          src += srcRowStride;
 393          dstRow += dstRowStride / sizeof(GLuint);
 394       }
 395    }
 396
 397    free(depth);
 398    free(stencil);
 399    return GL_TRUE;
 400 }
 401
 402
 403 /**
 404  * Store a combined depth/stencil texture image.
 405  */
 406 static GLboolean
 407 _mesa_texstore_s8_z24(TEXSTORE_PARAMS)
 408 {
 409    const GLuint depthScale = 0xffffff;
 410    const GLint srcRowStride
 411       = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat, srcType);
 412    GLint img, row;
 413    GLuint *depth;
 414    GLubyte *stencil;
 415
 416    ASSERT(dstFormat == MESA_FORMAT_Z24_UNORM_S8_UINT);
 417    ASSERT(srcFormat == GL_DEPTH_STENCIL_EXT ||
 418           srcFormat == GL_DEPTH_COMPONENT ||
 419           srcFormat == GL_STENCIL_INDEX);
 420    ASSERT(srcFormat != GL_DEPTH_STENCIL_EXT ||
 421           srcType == GL_UNSIGNED_INT_24_8_EXT ||
 422           srcType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
 423
 424    depth = malloc(srcWidth * sizeof(GLuint));
 425    stencil = malloc(srcWidth * sizeof(GLubyte));
 426
 427    if (!depth || !stencil) {
 428       free(depth);
 429       free(stencil);
 430       return GL_FALSE;
 431    }
 432
 433    for (img = 0; img < srcDepth; img++) {
 434       GLuint *dstRow = (GLuint *) dstSlices[img];
 435       const GLubyte *src
 436          = (const GLubyte *) _mesa_image_address(dims, srcPacking, srcAddr,
 437                                                 srcWidth, srcHeight,
 438                                                 srcFormat, srcType,
 439                                                 img, 0, 0);
 440       for (row = 0; row < srcHeight; row++) {
 441          GLint i;
 442          GLboolean keepdepth = GL_FALSE, keepstencil = GL_FALSE;
 443
 444          if (srcFormat == GL_DEPTH_COMPONENT) { /* preserve stencil */
 445             keepstencil = GL_TRUE;
 446          }
 447          else if (srcFormat == GL_STENCIL_INDEX) { /* preserve depth */
 448             keepdepth = GL_TRUE;
 449          }
 450
 451          if (keepdepth == GL_FALSE)
 452             /* the 24 depth bits will be in the low position: */
 453             _mesa_unpack_depth_span(ctx, srcWidth,
 454                                     GL_UNSIGNED_INT, /* dst type */
 455                                     keepstencil ? depth : dstRow, /* dst addr */
 456                                     depthScale,
 457                                     srcType, src, srcPacking);
 458
 459          if (keepstencil == GL_FALSE)
 460             /* get the 8-bit stencil values */
 461             _mesa_unpack_stencil_span(ctx, srcWidth,
 462                                       GL_UNSIGNED_BYTE, /* dst type */
 463                                       stencil, /* dst addr */
 464                                       srcType, src, srcPacking,
 465                                       ctx->_ImageTransferState);
 466
 467          /* merge stencil values into depth values */
 468          for (i = 0; i < srcWidth; i++) {
 469             if (keepstencil)
 470                dstRow[i] = depth[i] | (dstRow[i] & 0xFF000000);
 471             else
 472                dstRow[i] = (dstRow[i] & 0xFFFFFF) | (stencil[i] << 24);
 473
 474          }
 475          src += srcRowStride;
 476          dstRow += dstRowStride / sizeof(GLuint);
 477       }
 478    }
 479
 480    free(depth);
 481    free(stencil);
 482
 483    return GL_TRUE;
 484 }
 485
 486
 487 /**
 488  * Store simple 8-bit/value stencil texture data.
 489  */
 490 static GLboolean
 491 _mesa_texstore_s8(TEXSTORE_PARAMS)
 492 {
 493    ASSERT(dstFormat == MESA_FORMAT_S_UINT8);
 494    ASSERT(srcFormat == GL_STENCIL_INDEX);
 495
 496    {
 497       const GLint srcRowStride
 498          = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat, srcType);
 499       GLint img, row;
 500       GLubyte *stencil = malloc(srcWidth * sizeof(GLubyte));
 501
 502       if (!stencil)
 503          return GL_FALSE;
 504
 505       for (img = 0; img < srcDepth; img++) {
 506          GLubyte *dstRow = dstSlices[img];
 507          const GLubyte *src
 508             = (const GLubyte *) _mesa_image_address(dims, srcPacking, srcAddr,
 509                                                    srcWidth, srcHeight,
 510                                                    srcFormat, srcType,
 511                                                    img, 0, 0);
 512          for (row = 0; row < srcHeight; row++) {
 513             GLint i;
 514
 515             /* get the 8-bit stencil values */
 516             _mesa_unpack_stencil_span(ctx, srcWidth,
 517                                       GL_UNSIGNED_BYTE, /* dst type */
 518                                       stencil, /* dst addr */
 519                                       srcType, src, srcPacking,
 520                                       ctx->_ImageTransferState);
 521             /* merge stencil values into depth values */
 522             for (i = 0; i < srcWidth; i++)
 523                dstRow[i] = stencil[i];
 524
 525             src += srcRowStride;
 526             dstRow += dstRowStride / sizeof(GLubyte);
 527          }
 528       }
 529
 530       free(stencil);
 531    }
 532
 533    return GL_TRUE;
 534 }
 535
 536
 537 static GLboolean
 538 _mesa_texstore_z32f_x24s8(TEXSTORE_PARAMS)
 539 {
 540    GLint img, row;
 541    const GLint srcRowStride
 542       = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat, srcType)
 543       / sizeof(uint64_t);
 544
 545    ASSERT(dstFormat == MESA_FORMAT_Z32_FLOAT_S8X24_UINT);
 546    ASSERT(srcFormat == GL_DEPTH_STENCIL ||
 547           srcFormat == GL_DEPTH_COMPONENT ||
 548           srcFormat == GL_STENCIL_INDEX);
 549    ASSERT(srcFormat != GL_DEPTH_STENCIL ||
 550           srcType == GL_UNSIGNED_INT_24_8 ||
 551           srcType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
 552
 553    /* In case we only upload depth we need to preserve the stencil */
 554    for (img = 0; img < srcDepth; img++) {
 555       uint64_t *dstRow = (uint64_t *) dstSlices[img];
 556       const uint64_t *src
 557          = (const uint64_t *) _mesa_image_address(dims, srcPacking, srcAddr,
 558                srcWidth, srcHeight,
 559                srcFormat, srcType,
 560                img, 0, 0);
 561       for (row = 0; row < srcHeight; row++) {
 562          /* The unpack functions with:
 563           *    dstType = GL_FLOAT_32_UNSIGNED_INT_24_8_REV
 564           * only write their own dword, so the other dword (stencil
 565           * or depth) is preserved. */
 566          if (srcFormat != GL_STENCIL_INDEX)
 567             _mesa_unpack_depth_span(ctx, srcWidth,
 568                                     GL_FLOAT_32_UNSIGNED_INT_24_8_REV, /* dst type */
 569                                     dstRow, /* dst addr */
 570                                     ~0U, srcType, src, srcPacking);
 571
 572          if (srcFormat != GL_DEPTH_COMPONENT)
 573             _mesa_unpack_stencil_span(ctx, srcWidth,
 574                                       GL_FLOAT_32_UNSIGNED_INT_24_8_REV, /* dst type */
 575                                       dstRow, /* dst addr */
 576                                       srcType, src, srcPacking,
 577                                       ctx->_ImageTransferState);
 578
 579          src += srcRowStride;
 580          dstRow += dstRowStride / sizeof(uint64_t);
 581       }
 582    }
 583    return GL_TRUE;
 584 }
 585
 586 static GLboolean
 587 texstore_depth_stencil(TEXSTORE_PARAMS)
 588 {
 589    static StoreTexImageFunc table[MESA_FORMAT_COUNT];
 590    static GLboolean initialized = GL_FALSE;
 591
 592    if (!initialized) {
 593       memset(table, 0, sizeof table);
 594
 595       table[MESA_FORMAT_S8_UINT_Z24_UNORM] = _mesa_texstore_z24_s8;
 596       table[MESA_FORMAT_Z24_UNORM_S8_UINT] = _mesa_texstore_s8_z24;
 597       table[MESA_FORMAT_Z_UNORM16] = _mesa_texstore_z16;
 598       table[MESA_FORMAT_Z24_UNORM_X8_UINT] = _mesa_texstore_x8_z24;
 599       table[MESA_FORMAT_X8_UINT_Z24_UNORM] = _mesa_texstore_z24_x8;
 600       table[MESA_FORMAT_Z_UNORM32] = _mesa_texstore_z32;
 601       table[MESA_FORMAT_S_UINT8] = _mesa_texstore_s8;
 602       table[MESA_FORMAT_Z_FLOAT32] = _mesa_texstore_z32;
 603       table[MESA_FORMAT_Z32_FLOAT_S8X24_UINT] = _mesa_texstore_z32f_x24s8;
 604
 605       initialized = GL_TRUE;
 606    }
 607
 608    ASSERT(table[dstFormat]);
 609    return table[dstFormat](ctx, dims, baseInternalFormat,
 610                            dstFormat, dstRowStride, dstSlices,
 611                            srcWidth, srcHeight, srcDepth,
 612                            srcFormat, srcType, srcAddr, srcPacking);
 613 }
 614
 615 static GLboolean
 616 texstore_compressed(TEXSTORE_PARAMS)
 617 {
 618    static StoreTexImageFunc table[MESA_FORMAT_COUNT];
 619    static GLboolean initialized = GL_FALSE;
 620
 621    if (!initialized) {
 622       memset(table, 0, sizeof table);
 623
 624       table[MESA_FORMAT_SRGB_DXT1] = _mesa_texstore_rgb_dxt1;
 625       table[MESA_FORMAT_SRGBA_DXT1] = _mesa_texstore_rgba_dxt1;
 626       table[MESA_FORMAT_SRGBA_DXT3] = _mesa_texstore_rgba_dxt3;
 627       table[MESA_FORMAT_SRGBA_DXT5] = _mesa_texstore_rgba_dxt5;
 628       table[MESA_FORMAT_RGB_FXT1] = _mesa_texstore_rgb_fxt1;
 629       table[MESA_FORMAT_RGBA_FXT1] = _mesa_texstore_rgba_fxt1;
 630       table[MESA_FORMAT_RGB_DXT1] = _mesa_texstore_rgb_dxt1;
 631       table[MESA_FORMAT_RGBA_DXT1] = _mesa_texstore_rgba_dxt1;
 632       table[MESA_FORMAT_RGBA_DXT3] = _mesa_texstore_rgba_dxt3;
 633       table[MESA_FORMAT_RGBA_DXT5] = _mesa_texstore_rgba_dxt5;
 634       table[MESA_FORMAT_R_RGTC1_UNORM] = _mesa_texstore_red_rgtc1;
 635       table[MESA_FORMAT_R_RGTC1_SNORM] = _mesa_texstore_signed_red_rgtc1;
 636       table[MESA_FORMAT_RG_RGTC2_UNORM] = _mesa_texstore_rg_rgtc2;
 637       table[MESA_FORMAT_RG_RGTC2_SNORM] = _mesa_texstore_signed_rg_rgtc2;
 638       table[MESA_FORMAT_L_LATC1_UNORM] = _mesa_texstore_red_rgtc1;
 639       table[MESA_FORMAT_L_LATC1_SNORM] = _mesa_texstore_signed_red_rgtc1;
 640       table[MESA_FORMAT_LA_LATC2_UNORM] = _mesa_texstore_rg_rgtc2;
 641       table[MESA_FORMAT_LA_LATC2_SNORM] = _mesa_texstore_signed_rg_rgtc2;
 642       table[MESA_FORMAT_ETC1_RGB8] = _mesa_texstore_etc1_rgb8;
 643       table[MESA_FORMAT_ETC2_RGB8] = _mesa_texstore_etc2_rgb8;
 644       table[MESA_FORMAT_ETC2_SRGB8] = _mesa_texstore_etc2_srgb8;
 645       table[MESA_FORMAT_ETC2_RGBA8_EAC] = _mesa_texstore_etc2_rgba8_eac;
 646       table[MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC] = _mesa_texstore_etc2_srgb8_alpha8_eac;
 647       table[MESA_FORMAT_ETC2_R11_EAC] = _mesa_texstore_etc2_r11_eac;
 648       table[MESA_FORMAT_ETC2_RG11_EAC] = _mesa_texstore_etc2_rg11_eac;
 649       table[MESA_FORMAT_ETC2_SIGNED_R11_EAC] = _mesa_texstore_etc2_signed_r11_eac;
 650       table[MESA_FORMAT_ETC2_SIGNED_RG11_EAC] = _mesa_texstore_etc2_signed_rg11_eac;
 651       table[MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1] =
 652          _mesa_texstore_etc2_rgb8_punchthrough_alpha1;
 653       table[MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1] =
 654          _mesa_texstore_etc2_srgb8_punchthrough_alpha1;
 655
 656       table[MESA_FORMAT_BPTC_RGBA_UNORM] =
 657          _mesa_texstore_bptc_rgba_unorm;
 658       table[MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM] =
 659          _mesa_texstore_bptc_rgba_unorm;
 660       table[MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT] =
 661          _mesa_texstore_bptc_rgb_signed_float;
 662       table[MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT] =
 663          _mesa_texstore_bptc_rgb_unsigned_float;
 664
 665       initialized = GL_TRUE;
 666    }
 667
 668    ASSERT(table[dstFormat]);
 669    return table[dstFormat](ctx, dims, baseInternalFormat,
 670                            dstFormat, dstRowStride, dstSlices,
 671                            srcWidth, srcHeight, srcDepth,
 672                            srcFormat, srcType, srcAddr, srcPacking);
 673 }
 674
 675 static GLboolean
 676 texstore_rgba(TEXSTORE_PARAMS)
 677 {
 678    void *tempImage = NULL;
 679    int srcRowStride, img;
 680    GLubyte *src;
 681    uint32_t srcMesaFormat;
 682    uint8_t rebaseSwizzle[4];
 683    bool needRebase;
 684
 685    /* We have to handle MESA_FORMAT_YCBCR manually because it is a special case
 686     * and _mesa_format_convert does not support it. In this case the we only
 687     * allow conversions between YCBCR formats and it is mostly a memcpy.
 688     */
 689    if (dstFormat == MESA_FORMAT_YCBCR || dstFormat == MESA_FORMAT_YCBCR_REV) {
 690       return _mesa_texstore_ycbcr(ctx, dims, baseInternalFormat,
 691                                   dstFormat, dstRowStride, dstSlices,
 692                                   srcWidth, srcHeight, srcDepth,
 693                                   srcFormat, srcType, srcAddr,
 694                                   srcPacking);
 695    }
 696
 697    /* We have to deal with GL_COLOR_INDEX manually because
 698     * _mesa_format_convert does not handle this format. So what we do here is
 699     * convert it to RGBA ubyte first and then convert from that to dst as usual.
 700     */
 701    if (srcFormat == GL_COLOR_INDEX) {
 702       /* Notice that this will already handle byte swapping if necessary */
 703       tempImage =
 704          _mesa_unpack_color_index_to_rgba_ubyte(ctx, dims,
 705                                                 srcAddr, srcFormat, srcType,
 706                                                 srcWidth, srcHeight, srcDepth,
 707                                                 srcPacking,
 708                                                 ctx->_ImageTransferState);
 709       if (!tempImage)
 710          return GL_FALSE;
 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 components = _mesa_components_in_format(srcFormat);
 725          int elementCount = srcWidth * srcHeight * components;
 726          tempImage = malloc(elementCount * swapSize);
 727          if (!tempImage)
 728             return GL_FALSE;
 729          if (swapSize == 2)
 730             _mesa_swap2_copy(tempImage, (GLushort *) srcAddr, elementCount);
 731          else
 732             _mesa_swap4_copy(tempImage, (GLuint *) srcAddr, elementCount);
 733          srcAddr = tempImage;
 734       }
 735    }
 736
 737    srcRowStride =
 738       _mesa_image_row_stride(srcPacking, srcWidth, srcFormat, srcType);
 739
 740    src = (GLubyte *)
 741       _mesa_image_address(dims, srcPacking, srcAddr, srcWidth, srcHeight,
 742                           srcFormat, srcType, 0, 0, 0);
 743
 744    srcMesaFormat = _mesa_format_from_format_and_type(srcFormat, srcType);
 745    dstFormat = _mesa_get_srgb_format_linear(dstFormat);
 746
 747    if (_mesa_get_format_base_format(dstFormat) != baseInternalFormat) {
 748       needRebase =
 749          _mesa_compute_rgba2base2rgba_component_mapping(baseInternalFormat,
 750                                                         rebaseSwizzle);
 751    } else {
 752       needRebase = false;
 753    }
 754
 755    for (img = 0; img < srcDepth; img++) {
 756       _mesa_format_convert(dstSlices[img], dstFormat, dstRowStride,
 757                            src, srcMesaFormat, srcRowStride,
 758                            srcWidth, srcHeight,
 759                            needRebase ? rebaseSwizzle : NULL);
 760       src += srcHeight * srcRowStride;
 761    }
 762
 763    free(tempImage);
 764
 765    return GL_TRUE;
 766 }
 767
 768 GLboolean
 769 _mesa_texstore_needs_transfer_ops(struct gl_context *ctx,
 770                                   GLenum baseInternalFormat,
 771                                   mesa_format dstFormat)
 772 {
 773    GLenum dstType;
 774
 775    /* There are different rules depending on the base format. */
 776    switch (baseInternalFormat) {
 777    case GL_DEPTH_COMPONENT:
 778    case GL_DEPTH_STENCIL:
 779       return ctx->Pixel.DepthScale != 1.0f ||
 780              ctx->Pixel.DepthBias != 0.0f;
 781
 782    case GL_STENCIL_INDEX:
 783       return GL_FALSE;
 784
 785    default:
 786       /* Color formats.
 787        * Pixel transfer ops (scale, bias, table lookup) do not apply
 788        * to integer formats.
 789        */
 790       dstType = _mesa_get_format_datatype(dstFormat);
 791
 792       return dstType != GL_INT && dstType != GL_UNSIGNED_INT &&
 793              ctx->_ImageTransferState;
 794    }
 795 }
 796
 797
 798 GLboolean
 799 _mesa_texstore_can_use_memcpy(struct gl_context *ctx,
 800                               GLenum baseInternalFormat, mesa_format dstFormat,
 801                               GLenum srcFormat, GLenum srcType,
 802                               const struct gl_pixelstore_attrib *srcPacking)
 803 {
 804    if (_mesa_texstore_needs_transfer_ops(ctx, baseInternalFormat, dstFormat)) {
 805       return GL_FALSE;
 806    }
 807
 808    /* The base internal format and the base Mesa format must match. */
 809    if (baseInternalFormat != _mesa_get_format_base_format(dstFormat)) {
 810       return GL_FALSE;
 811    }
 812
 813    /* The Mesa format must match the input format and type. */
 814    if (!_mesa_format_matches_format_and_type(dstFormat, srcFormat, srcType,
 815                                              srcPacking->SwapBytes)) {
 816       return GL_FALSE;
 817    }
 818
 819    /* Depth texture data needs clamping in following cases:
 820     * - Floating point dstFormat with signed srcType: clamp to [0.0, 1.0].
 821     * - Fixed point dstFormat with signed srcType: clamp to [0, 2^n -1].
 822     *
 823     * All the cases except one (float dstFormat with float srcType) are ruled
 824     * out by _mesa_format_matches_format_and_type() check above. Handle the
 825     * remaining case here.
 826     */
 827    if ((baseInternalFormat == GL_DEPTH_COMPONENT ||
 828         baseInternalFormat == GL_DEPTH_STENCIL) &&
 829        (srcType == GL_FLOAT ||
 830         srcType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV)) {
 831       return GL_FALSE;
 832    }
 833
 834    return GL_TRUE;
 835 }
 836
 837 static GLboolean
 838 _mesa_texstore_memcpy(TEXSTORE_PARAMS)
 839 {
 840    if (!_mesa_texstore_can_use_memcpy(ctx, baseInternalFormat, dstFormat,
 841                                       srcFormat, srcType, srcPacking)) {
 842       return GL_FALSE;
 843    }
 844
 845    memcpy_texture(ctx, dims,
 846                   dstFormat,
 847                   dstRowStride, dstSlices,
 848                   srcWidth, srcHeight, srcDepth, srcFormat, srcType,
 849                   srcAddr, srcPacking);
 850    return GL_TRUE;
 851 }
 852 /**
 853  * Store user data into texture memory.
 854  * Called via glTex[Sub]Image1/2/3D()
 855  * \return GL_TRUE for success, GL_FALSE for failure (out of memory).
 856  */
 857 GLboolean
 858 _mesa_texstore(TEXSTORE_PARAMS)
 859 {
 860    if (_mesa_texstore_memcpy(ctx, dims, baseInternalFormat,
 861                              dstFormat,
 862                              dstRowStride, dstSlices,
 863                              srcWidth, srcHeight, srcDepth,
 864                              srcFormat, srcType, srcAddr, srcPacking)) {
 865       return GL_TRUE;
 866    }
 867
 868    if (_mesa_is_depth_or_stencil_format(baseInternalFormat)) {
 869       return texstore_depth_stencil(ctx, dims, baseInternalFormat,
 870                                     dstFormat, dstRowStride, dstSlices,
 871                                     srcWidth, srcHeight, srcDepth,
 872                                     srcFormat, srcType, srcAddr, srcPacking);
 873    } else if (_mesa_is_format_compressed(dstFormat)) {
 874       return texstore_compressed(ctx, dims, baseInternalFormat,
 875                                  dstFormat, dstRowStride, dstSlices,
 876                                  srcWidth, srcHeight, srcDepth,
 877                                  srcFormat, srcType, srcAddr, srcPacking);
 878    } else {
 879       return texstore_rgba(ctx, dims, baseInternalFormat,
 880                            dstFormat, dstRowStride, dstSlices,
 881                            srcWidth, srcHeight, srcDepth,
 882                            srcFormat, srcType, srcAddr, srcPacking);
 883    }
 884 }
 885
 886
 887 /**
 888  * Normally, we'll only _write_ texel data to a texture when we map it.
 889  * But if the user is providing depth or stencil values and the texture
 890  * image is a combined depth/stencil format, we'll actually read from
 891  * the texture buffer too (in order to insert the depth or stencil values.
 892  * \param userFormat  the user-provided image format
 893  * \param texFormat  the destination texture format
 894  */
 895 static GLbitfield
 896 get_read_write_mode(GLenum userFormat, mesa_format texFormat)
 897 {
 898    if ((userFormat == GL_STENCIL_INDEX || userFormat == GL_DEPTH_COMPONENT)
 899        && _mesa_get_format_base_format(texFormat) == GL_DEPTH_STENCIL)
 900       return GL_MAP_READ_BIT | GL_MAP_WRITE_BIT;
 901    else
 902       return GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_RANGE_BIT;
 903 }
 904
 905
 906 /**
 907  * Helper function for storing 1D, 2D, 3D whole and subimages into texture
 908  * memory.
 909  * The source of the image data may be user memory or a PBO.  In the later
 910  * case, we'll map the PBO, copy from it, then unmap it.
 911  */
 912 static void
 913 store_texsubimage(struct gl_context *ctx,
 914                   struct gl_texture_image *texImage,
 915                   GLint xoffset, GLint yoffset, GLint zoffset,
 916                   GLint width, GLint height, GLint depth,
 917                   GLenum format, GLenum type, const GLvoid *pixels,
 918                   const struct gl_pixelstore_attrib *packing,
 919                   const char *caller)
 920
 921 {
 922    const GLbitfield mapMode = get_read_write_mode(format, texImage->TexFormat);
 923    const GLenum target = texImage->TexObject->Target;
 924    GLboolean success = GL_FALSE;
 925    GLuint dims, slice, numSlices = 1, sliceOffset = 0;
 926    GLint srcImageStride = 0;
 927    const GLubyte *src;
 928
 929    assert(xoffset + width <= texImage->Width);
 930    assert(yoffset + height <= texImage->Height);
 931    assert(zoffset + depth <= texImage->Depth);
 932
 933    switch (target) {
 934    case GL_TEXTURE_1D:
 935       dims = 1;
 936       break;
 937    case GL_TEXTURE_2D_ARRAY:
 938    case GL_TEXTURE_CUBE_MAP_ARRAY:
 939    case GL_TEXTURE_3D:
 940       dims = 3;
 941       break;
 942    default:
 943       dims = 2;
 944    }
 945
 946    /* get pointer to src pixels (may be in a pbo which we'll map here) */
 947    src = (const GLubyte *)
 948       _mesa_validate_pbo_teximage(ctx, dims, width, height, depth,
 949                                   format, type, pixels, packing, caller);
 950    if (!src)
 951       return;
 952
 953    /* compute slice info (and do some sanity checks) */
 954    switch (target) {
 955    case GL_TEXTURE_2D:
 956    case GL_TEXTURE_RECTANGLE:
 957    case GL_TEXTURE_CUBE_MAP:
 958    case GL_TEXTURE_EXTERNAL_OES:
 959       /* one image slice, nothing special needs to be done */
 960       break;
 961    case GL_TEXTURE_1D:
 962       assert(height == 1);
 963       assert(depth == 1);
 964       assert(yoffset == 0);
 965       assert(zoffset == 0);
 966       break;
 967    case GL_TEXTURE_1D_ARRAY:
 968       assert(depth == 1);
 969       assert(zoffset == 0);
 970       numSlices = height;
 971       sliceOffset = yoffset;
 972       height = 1;
 973       yoffset = 0;
 974       srcImageStride = _mesa_image_row_stride(packing, width, format, type);
 975       break;
 976    case GL_TEXTURE_2D_ARRAY:
 977       numSlices = depth;
 978       sliceOffset = zoffset;
 979       depth = 1;
 980       zoffset = 0;
 981       srcImageStride = _mesa_image_image_stride(packing, width, height,
 982                                                 format, type);
 983       break;
 984    case GL_TEXTURE_3D:
 985       /* we'll store 3D images as a series of slices */
 986       numSlices = depth;
 987       sliceOffset = zoffset;
 988       srcImageStride = _mesa_image_image_stride(packing, width, height,
 989                                                 format, type);
 990       break;
 991    case GL_TEXTURE_CUBE_MAP_ARRAY:
 992       numSlices = depth;
 993       sliceOffset = zoffset;
 994       srcImageStride = _mesa_image_image_stride(packing, width, height,
 995                                                 format, type);
 996       break;
 997    default:
 998       _mesa_warning(ctx, "Unexpected target 0x%x in store_texsubimage()", target);
 999       return;
1000    }
1001
1002    assert(numSlices == 1 || srcImageStride != 0);
1003
1004    for (slice = 0; slice < numSlices; slice++) {
1005       GLubyte *dstMap;
1006       GLint dstRowStride;
1007
1008       ctx->Driver.MapTextureImage(ctx, texImage,
1009                                   slice + sliceOffset,
1010                                   xoffset, yoffset, width, height,
1011                                   mapMode, &dstMap, &dstRowStride);
1012       if (dstMap) {
1013          /* Note: we're only storing a 2D (or 1D) slice at a time but we need
1014           * to pass the right 'dims' value so that GL_UNPACK_SKIP_IMAGES is
1015           * used for 3D images.
1016           */
1017          success = _mesa_texstore(ctx, dims, texImage->_BaseFormat,
1018                                   texImage->TexFormat,
1019                                   dstRowStride,
1020                                   &dstMap,
1021                                   width, height, 1,  /* w, h, d */
1022                                   format, type, src, packing);
1023
1024          ctx->Driver.UnmapTextureImage(ctx, texImage, slice + sliceOffset);
1025       }
1026
1027       src += srcImageStride;
1028
1029       if (!success)
1030          break;
1031    }
1032
1033    if (!success)
1034       _mesa_error(ctx, GL_OUT_OF_MEMORY, "%s", caller);
1035
1036    _mesa_unmap_teximage_pbo(ctx, packing);
1037 }
1038
1039
1040
1041 /**
1042  * Fallback code for ctx->Driver.TexImage().
1043  * Basically, allocate storage for the texture image, then copy the
1044  * user's image into it.
1045  */
1046 void
1047 _mesa_store_teximage(struct gl_context *ctx,
1048                      GLuint dims,
1049                      struct gl_texture_image *texImage,
1050                      GLenum format, GLenum type, const GLvoid *pixels,
1051                      const struct gl_pixelstore_attrib *packing)
1052 {
1053    assert(dims == 1 || dims == 2 || dims == 3);
1054
1055    if (texImage->Width == 0 || texImage->Height == 0 || texImage->Depth == 0)
1056       return;
1057
1058    /* allocate storage for texture data */
1059    if (!ctx->Driver.AllocTextureImageBuffer(ctx, texImage)) {
1060       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glTexImage%uD", dims);
1061       return;
1062    }
1063
1064    store_texsubimage(ctx, texImage,
1065                      0, 0, 0, texImage->Width, texImage->Height, texImage->Depth,
1066                      format, type, pixels, packing, "glTexImage");
1067 }
1068
1069
1070 /*
1071  * Fallback for Driver.TexSubImage().
1072  */
1073 void
1074 _mesa_store_texsubimage(struct gl_context *ctx, GLuint dims,
1075                         struct gl_texture_image *texImage,
1076                         GLint xoffset, GLint yoffset, GLint zoffset,
1077                         GLint width, GLint height, GLint depth,
1078                         GLenum format, GLenum type, const void *pixels,
1079                         const struct gl_pixelstore_attrib *packing)
1080 {
1081    store_texsubimage(ctx, texImage,
1082                      xoffset, yoffset, zoffset, width, height, depth,
1083                      format, type, pixels, packing, "glTexSubImage");
1084 }
1085
1086 static void
1087 clear_image_to_zero(GLubyte *dstMap, GLint dstRowStride,
1088                     GLsizei width, GLsizei height,
1089                     GLsizei clearValueSize)
1090 {
1091    GLsizei y;
1092
1093    for (y = 0; y < height; y++) {
1094       memset(dstMap, 0, clearValueSize * width);
1095       dstMap += dstRowStride;
1096    }
1097 }
1098
1099 static void
1100 clear_image_to_value(GLubyte *dstMap, GLint dstRowStride,
1101                      GLsizei width, GLsizei height,
1102                      const GLvoid *clearValue,
1103                      GLsizei clearValueSize)
1104 {
1105    GLsizei y, x;
1106
1107    for (y = 0; y < height; y++) {
1108       for (x = 0; x < width; x++) {
1109          memcpy(dstMap, clearValue, clearValueSize);
1110          dstMap += clearValueSize;
1111       }
1112       dstMap += dstRowStride - clearValueSize * width;
1113    }
1114 }
1115
1116 /*
1117  * Fallback for Driver.ClearTexSubImage().
1118  */
1119 void
1120 _mesa_store_cleartexsubimage(struct gl_context *ctx,
1121                              struct gl_texture_image *texImage,
1122                              GLint xoffset, GLint yoffset, GLint zoffset,
1123                              GLsizei width, GLsizei height, GLsizei depth,
1124                              const GLvoid *clearValue)
1125 {
1126    GLubyte *dstMap;
1127    GLint dstRowStride;
1128    GLsizeiptr clearValueSize;
1129    GLsizei z;
1130
1131    clearValueSize = _mesa_get_format_bytes(texImage->TexFormat);
1132
1133    for (z = 0; z < depth; z++) {
1134       ctx->Driver.MapTextureImage(ctx, texImage,
1135                                   z + zoffset, xoffset, yoffset,
1136                                   width, height,
1137                                   GL_MAP_WRITE_BIT,
1138                                   &dstMap, &dstRowStride);
1139       if (dstMap == NULL) {
1140          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glClearTex*Image");
1141          return;
1142       }
1143
1144       if (clearValue) {
1145          clear_image_to_value(dstMap, dstRowStride,
1146                               width, height,
1147                               clearValue,
1148                               clearValueSize);
1149       } else {
1150          clear_image_to_zero(dstMap, dstRowStride,
1151                              width, height,
1152                              clearValueSize);
1153       }
1154
1155       ctx->Driver.UnmapTextureImage(ctx, texImage, z + zoffset);
1156    }
1157 }
1158
1159 /**
1160  * Fallback for Driver.CompressedTexImage()
1161  */
1162 void
1163 _mesa_store_compressed_teximage(struct gl_context *ctx, GLuint dims,
1164                                 struct gl_texture_image *texImage,
1165                                 GLsizei imageSize, const GLvoid *data)
1166 {
1167    /* only 2D and 3D compressed images are supported at this time */
1168    if (dims == 1) {
1169       _mesa_problem(ctx, "Unexpected glCompressedTexImage1D call");
1170       return;
1171    }
1172
1173    /* This is pretty simple, because unlike the general texstore path we don't
1174     * have to worry about the usual image unpacking or image transfer
1175     * operations.
1176     */
1177    ASSERT(texImage);
1178    ASSERT(texImage->Width > 0);
1179    ASSERT(texImage->Height > 0);
1180    ASSERT(texImage->Depth > 0);
1181
1182    /* allocate storage for texture data */
1183    if (!ctx->Driver.AllocTextureImageBuffer(ctx, texImage)) {
1184       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCompressedTexImage%uD", dims);
1185       return;
1186    }
1187
1188    _mesa_store_compressed_texsubimage(ctx, dims, texImage,
1189                                       0, 0, 0,
1190                                       texImage->Width, texImage->Height, texImage->Depth,
1191                                       texImage->TexFormat,
1192                                       imageSize, data);
1193 }
1194
1195
1196 /**
1197  * Compute compressed_pixelstore parameters for copying compressed
1198  * texture data.
1199  * \param dims  number of texture image dimensions: 1, 2 or 3
1200  * \param texFormat  the compressed texture format
1201  * \param width, height, depth  size of image to copy
1202  * \param packing  pixelstore parameters describing user-space image packing
1203  * \param store  returns the compressed_pixelstore parameters
1204  */
1205 void
1206 _mesa_compute_compressed_pixelstore(GLuint dims, mesa_format texFormat,
1207                                     GLsizei width, GLsizei height,
1208                                     GLsizei depth,
1209                                     const struct gl_pixelstore_attrib *packing,
1210                                     struct compressed_pixelstore *store)
1211 {
1212    GLuint bw, bh;
1213
1214    _mesa_get_format_block_size(texFormat, &bw, &bh);
1215
1216    store->SkipBytes = 0;
1217    store->TotalBytesPerRow = store->CopyBytesPerRow =
1218          _mesa_format_row_stride(texFormat, width);
1219    store->TotalRowsPerSlice = store->CopyRowsPerSlice =
1220          (height + bh - 1) / bh;
1221    store->CopySlices = depth;
1222
1223    if (packing->CompressedBlockWidth &&
1224        packing->CompressedBlockSize) {
1225
1226       bw = packing->CompressedBlockWidth;
1227
1228       if (packing->RowLength) {
1229          store->TotalBytesPerRow = packing->CompressedBlockSize *
1230             ((packing->RowLength + bw - 1) / bw);
1231       }
1232
1233       store->SkipBytes += packing->SkipPixels * packing->CompressedBlockSize / bw;
1234    }
1235
1236    if (dims > 1 && packing->CompressedBlockHeight &&
1237        packing->CompressedBlockSize) {
1238
1239       bh = packing->CompressedBlockHeight;
1240
1241       store->SkipBytes += packing->SkipRows * store->TotalBytesPerRow / bh;
1242       store->CopyRowsPerSlice = (height + bh - 1) / bh;  /* rows in blocks */
1243
1244       if (packing->ImageHeight) {
1245          store->TotalRowsPerSlice = (packing->ImageHeight + bh - 1) / bh;
1246       }
1247    }
1248
1249    if (dims > 2 && packing->CompressedBlockDepth &&
1250        packing->CompressedBlockSize) {
1251
1252       int bd = packing->CompressedBlockDepth;
1253
1254       store->SkipBytes += packing->SkipImages * store->TotalBytesPerRow *
1255             store->TotalRowsPerSlice / bd;
1256    }
1257 }
1258
1259
1260 /**
1261  * Fallback for Driver.CompressedTexSubImage()
1262  */
1263 void
1264 _mesa_store_compressed_texsubimage(struct gl_context *ctx, GLuint dims,
1265                                    struct gl_texture_image *texImage,
1266                                    GLint xoffset, GLint yoffset, GLint zoffset,
1267                                    GLsizei width, GLsizei height, GLsizei depth,
1268                                    GLenum format,
1269                                    GLsizei imageSize, const GLvoid *data)
1270 {
1271    struct compressed_pixelstore store;
1272    GLint dstRowStride;
1273    GLint i, slice;
1274    GLubyte *dstMap;
1275    const GLubyte *src;
1276
1277    if (dims == 1) {
1278       _mesa_problem(ctx, "Unexpected 1D compressed texsubimage call");
1279       return;
1280    }
1281
1282    _mesa_compute_compressed_pixelstore(dims, texImage->TexFormat,
1283                                        width, height, depth,
1284                                        &ctx->Unpack, &store);
1285
1286    /* get pointer to src pixels (may be in a pbo which we'll map here) */
1287    data = _mesa_validate_pbo_compressed_teximage(ctx, dims, imageSize, data,
1288                                                  &ctx->Unpack,
1289                                                  "glCompressedTexSubImage");
1290    if (!data)
1291       return;
1292
1293    src = (const GLubyte *) data + store.SkipBytes;
1294
1295    for (slice = 0; slice < store.CopySlices; slice++) {
1296       /* Map dest texture buffer */
1297       ctx->Driver.MapTextureImage(ctx, texImage, slice + zoffset,
1298                                   xoffset, yoffset, width, height,
1299                                   GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_RANGE_BIT,
1300                                   &dstMap, &dstRowStride);
1301
1302       if (dstMap) {
1303
1304          /* copy rows of blocks */
1305          for (i = 0; i < store.CopyRowsPerSlice; i++) {
1306             memcpy(dstMap, src, store.CopyBytesPerRow);
1307             dstMap += dstRowStride;
1308             src += store.TotalBytesPerRow;
1309          }
1310
1311          ctx->Driver.UnmapTextureImage(ctx, texImage, slice + zoffset);
1312
1313          /* advance to next slice */
1314          src += store.TotalBytesPerRow * (store.TotalRowsPerSlice - store.CopyRowsPerSlice);
1315       }
1316       else {
1317          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCompressedTexSubImage%uD",
1318                      dims);
1319       }
1320    }
1321
1322    _mesa_unmap_teximage_pbo(ctx, &ctx->Unpack);
1323 }