src/mesa/main/textureview.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2013 LunarG, Inc.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Courtney Goeltzenleuchter <courtney@lunarg.com>
  26  */
  27
  28
  29 /**
  30  * \file textureview.c
  31  * GL_ARB_texture_view functions
  32  */
  33
  34 #include "glheader.h"
  35 #include "context.h"
  36 #include "enums.h"
  37 #include "imports.h"
  38 #include "macros.h"
  39 #include "teximage.h"
  40 #include "texobj.h"
  41 #include "mipmap.h"
  42 #include "texstorage.h"
  43 #include "textureview.h"
  44 #include "stdbool.h"
  45 #include "mtypes.h"
  46
  47 /* Table 3.X.2 (Compatible internal formats for TextureView)
  48     ---------------------------------------------------------------------------
  49     | Class                 | Internal formats                                |
  50     ---------------------------------------------------------------------------
  51     | VIEW_CLASS_128_BITS   | RGBA32F, RGBA32UI, RGBA32I                      |
  52     ---------------------------------------------------------------------------
  53     | VIEW_CLASS_96_BITS    | RGB32F, RGB32UI, RGB32I                         |
  54     ---------------------------------------------------------------------------
  55     | VIEW_CLASS_64_BITS    | RGBA16F, RG32F, RGBA16UI, RG32UI, RGBA16I,      |
  56     |                       | RG32I, RGBA16, RGBA16_SNORM                     |
  57     ---------------------------------------------------------------------------
  58     | VIEW_CLASS_48_BITS    | RGB16, RGB16_SNORM, RGB16F, RGB16UI, RGB16I     |
  59     ---------------------------------------------------------------------------
  60     | VIEW_CLASS_32_BITS    | RG16F, R11F_G11F_B10F, R32F,                    |
  61     |                       | RGB10_A2UI, RGBA8UI, RG16UI, R32UI,             |
  62     |                       | RGBA8I, RG16I, R32I, RGB10_A2, RGBA8, RG16,     |
  63     |                       | RGBA8_SNORM, RG16_SNORM, SRGB8_ALPHA8, RGB9_E5  |
  64     ---------------------------------------------------------------------------
  65     | VIEW_CLASS_24_BITS    | RGB8, RGB8_SNORM, SRGB8, RGB8UI, RGB8I          |
  66     ---------------------------------------------------------------------------
  67     | VIEW_CLASS_16_BITS    | R16F, RG8UI, R16UI, RG8I, R16I, RG8, R16,       |
  68     |                       | RG8_SNORM, R16_SNORM                            |
  69     ---------------------------------------------------------------------------
  70     | VIEW_CLASS_8_BITS     | R8UI, R8I, R8, R8_SNORM                         |
  71     ---------------------------------------------------------------------------
  72     | VIEW_CLASS_RGTC1_RED  | COMPRESSED_RED_RGTC1,                           |
  73     |                       | COMPRESSED_SIGNED_RED_RGTC1                     |
  74     ---------------------------------------------------------------------------
  75     | VIEW_CLASS_RGTC2_RG   | COMPRESSED_RG_RGTC2,                            |
  76     |                       | COMPRESSED_SIGNED_RG_RGTC2                      |
  77     ---------------------------------------------------------------------------
  78     | VIEW_CLASS_BPTC_UNORM | COMPRESSED_RGBA_BPTC_UNORM,                     |
  79     |                       | COMPRESSED_SRGB_ALPHA_BPTC_UNORM                |
  80     ---------------------------------------------------------------------------
  81     | VIEW_CLASS_BPTC_FLOAT | COMPRESSED_RGB_BPTC_SIGNED_FLOAT,               |
  82     |                       | COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT              |
  83     ---------------------------------------------------------------------------
  84  */
  85 struct internal_format_class_info {
  86    GLenum view_class;
  87    GLenum internal_format;
  88 };
  89 static const struct internal_format_class_info compatible_internal_formats[] = {
  90    {GL_VIEW_CLASS_128_BITS, GL_RGBA32F},
  91    {GL_VIEW_CLASS_128_BITS, GL_RGBA32UI},
  92    {GL_VIEW_CLASS_128_BITS, GL_RGBA32I},
  93    {GL_VIEW_CLASS_96_BITS, GL_RGB32F},
  94    {GL_VIEW_CLASS_96_BITS, GL_RGB32UI},
  95    {GL_VIEW_CLASS_96_BITS, GL_RGB32I},
  96    {GL_VIEW_CLASS_64_BITS, GL_RGBA16F},
  97    {GL_VIEW_CLASS_64_BITS, GL_RG32F},
  98    {GL_VIEW_CLASS_64_BITS, GL_RGBA16UI},
  99    {GL_VIEW_CLASS_64_BITS, GL_RG32UI},
 100    {GL_VIEW_CLASS_64_BITS, GL_RGBA16I},
 101    {GL_VIEW_CLASS_64_BITS, GL_RG32I},
 102    {GL_VIEW_CLASS_64_BITS, GL_RGBA16},
 103    {GL_VIEW_CLASS_64_BITS, GL_RGBA16_SNORM},
 104    {GL_VIEW_CLASS_48_BITS, GL_RGB16},
 105    {GL_VIEW_CLASS_48_BITS, GL_RGB16_SNORM},
 106    {GL_VIEW_CLASS_48_BITS, GL_RGB16F},
 107    {GL_VIEW_CLASS_48_BITS, GL_RGB16UI},
 108    {GL_VIEW_CLASS_48_BITS, GL_RGB16I},
 109    {GL_VIEW_CLASS_32_BITS, GL_RG16F},
 110    {GL_VIEW_CLASS_32_BITS, GL_R11F_G11F_B10F},
 111    {GL_VIEW_CLASS_32_BITS, GL_R32F},
 112    {GL_VIEW_CLASS_32_BITS, GL_RGB10_A2UI},
 113    {GL_VIEW_CLASS_32_BITS, GL_RGBA8UI},
 114    {GL_VIEW_CLASS_32_BITS, GL_RG16UI},
 115    {GL_VIEW_CLASS_32_BITS, GL_R32UI},
 116    {GL_VIEW_CLASS_32_BITS, GL_RGBA8I},
 117    {GL_VIEW_CLASS_32_BITS, GL_RG16I},
 118    {GL_VIEW_CLASS_32_BITS, GL_R32I},
 119    {GL_VIEW_CLASS_32_BITS, GL_RGB10_A2},
 120    {GL_VIEW_CLASS_32_BITS, GL_RGBA8},
 121    {GL_VIEW_CLASS_32_BITS, GL_RG16},
 122    {GL_VIEW_CLASS_32_BITS, GL_RGBA8_SNORM},
 123    {GL_VIEW_CLASS_32_BITS, GL_RG16_SNORM},
 124    {GL_VIEW_CLASS_32_BITS, GL_SRGB8_ALPHA8},
 125    {GL_VIEW_CLASS_32_BITS, GL_RGB9_E5},
 126    {GL_VIEW_CLASS_24_BITS, GL_RGB8},
 127    {GL_VIEW_CLASS_24_BITS, GL_RGB8_SNORM},
 128    {GL_VIEW_CLASS_24_BITS, GL_SRGB8},
 129    {GL_VIEW_CLASS_24_BITS, GL_RGB8UI},
 130    {GL_VIEW_CLASS_24_BITS, GL_RGB8I},
 131    {GL_VIEW_CLASS_16_BITS, GL_R16F},
 132    {GL_VIEW_CLASS_16_BITS, GL_RG8UI},
 133    {GL_VIEW_CLASS_16_BITS, GL_R16UI},
 134    {GL_VIEW_CLASS_16_BITS, GL_RG8I},
 135    {GL_VIEW_CLASS_16_BITS, GL_R16I},
 136    {GL_VIEW_CLASS_16_BITS, GL_RG8},
 137    {GL_VIEW_CLASS_16_BITS, GL_R16},
 138    {GL_VIEW_CLASS_16_BITS, GL_RG8_SNORM},
 139    {GL_VIEW_CLASS_16_BITS, GL_R16_SNORM},
 140    {GL_VIEW_CLASS_8_BITS, GL_R8UI},
 141    {GL_VIEW_CLASS_8_BITS, GL_R8I},
 142    {GL_VIEW_CLASS_8_BITS, GL_R8},
 143    {GL_VIEW_CLASS_8_BITS, GL_R8_SNORM},
 144    {GL_VIEW_CLASS_RGTC1_RED, GL_COMPRESSED_RED_RGTC1},
 145    {GL_VIEW_CLASS_RGTC1_RED, GL_COMPRESSED_SIGNED_RED_RGTC1},
 146    {GL_VIEW_CLASS_RGTC2_RG, GL_COMPRESSED_RG_RGTC2},
 147    {GL_VIEW_CLASS_RGTC2_RG, GL_COMPRESSED_SIGNED_RG_RGTC2},
 148    {GL_VIEW_CLASS_BPTC_UNORM, GL_COMPRESSED_RGBA_BPTC_UNORM_ARB},
 149    {GL_VIEW_CLASS_BPTC_UNORM, GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB},
 150    {GL_VIEW_CLASS_BPTC_FLOAT, GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_ARB},
 151    {GL_VIEW_CLASS_BPTC_FLOAT, GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_ARB},
 152 };
 153
 154 static const struct internal_format_class_info s3tc_compatible_internal_formats[] = {
 155    {GL_VIEW_CLASS_S3TC_DXT1_RGB, GL_COMPRESSED_RGB_S3TC_DXT1_EXT},
 156    {GL_VIEW_CLASS_S3TC_DXT1_RGB, GL_COMPRESSED_SRGB_S3TC_DXT1_EXT},
 157    {GL_VIEW_CLASS_S3TC_DXT1_RGBA, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT},
 158    {GL_VIEW_CLASS_S3TC_DXT1_RGBA, GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT},
 159    {GL_VIEW_CLASS_S3TC_DXT3_RGBA, GL_COMPRESSED_RGBA_S3TC_DXT3_EXT},
 160    {GL_VIEW_CLASS_S3TC_DXT3_RGBA, GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT},
 161    {GL_VIEW_CLASS_S3TC_DXT5_RGBA, GL_COMPRESSED_RGBA_S3TC_DXT5_EXT},
 162    {GL_VIEW_CLASS_S3TC_DXT5_RGBA, GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT},
 163 };
 164
 165 /**
 166  * Lookup format view class based on internalformat
 167  * \return VIEW_CLASS if internalformat found in table, false otherwise.
 168  */
 169 static GLenum
 170 lookup_view_class(struct gl_context *ctx, GLenum internalformat)
 171 {
 172    GLuint i;
 173
 174    for (i = 0; i < ARRAY_SIZE(compatible_internal_formats); i++) {
 175       if (compatible_internal_formats[i].internal_format == internalformat)
 176          return compatible_internal_formats[i].view_class;
 177    }
 178
 179    if (ctx->Extensions.EXT_texture_compression_s3tc && ctx->Extensions.EXT_texture_sRGB) {
 180       for (i = 0; i < ARRAY_SIZE(s3tc_compatible_internal_formats); i++) {
 181          if (s3tc_compatible_internal_formats[i].internal_format == internalformat)
 182             return s3tc_compatible_internal_formats[i].view_class;
 183       }
 184    }
 185    return GL_FALSE;
 186 }
 187
 188 /**
 189  * Initialize new texture's gl_texture_image structures. Will not call driver
 190  * to allocate new space, simply record relevant layer, face, format, etc.
 191  * \return GL_FALSE if any error, GL_TRUE otherwise.
 192  */
 193 static GLboolean
 194 initialize_texture_fields(struct gl_context *ctx,
 195                           GLenum target,
 196                           struct gl_texture_object *texObj,
 197                           GLint levels,
 198                           GLsizei width, GLsizei height, GLsizei depth,
 199                           GLenum internalFormat, gl_format texFormat)
 200 {
 201    const GLuint numFaces = _mesa_num_tex_faces(target);
 202    GLint level, levelWidth = width, levelHeight = height, levelDepth = depth;
 203    GLuint face;
 204
 205    /* Pretend we are bound to initialize the gl_texture_image structs */
 206    texObj->Target = target;
 207
 208    /* Set up all the texture object's gl_texture_images */
 209    for (level = 0; level < levels; level++) {
 210       for (face = 0; face < numFaces; face++) {
 211          struct gl_texture_image *texImage =
 212                  _mesa_get_tex_image(ctx, texObj, face, level);
 213
 214          if (!texImage) {
 215             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glTexStorage");
 216             return GL_FALSE;
 217          }
 218
 219          _mesa_init_teximage_fields(ctx, texImage,
 220                                     levelWidth, levelHeight, levelDepth,
 221                                     0, internalFormat, texFormat);
 222       }
 223
 224       _mesa_next_mipmap_level_size(target, 0, levelWidth, levelHeight, levelDepth,
 225                                    &levelWidth, &levelHeight, &levelDepth);
 226    }
 227
 228    /* "unbind" */
 229    texObj->Target = 0;
 230
 231    return GL_TRUE;
 232 }
 233
 234 #define RETURN_IF_SUPPORTED(t) do {             \
 235    if (newTarget == GL_ ## t)                   \
 236       return true;                              \
 237 } while (0)
 238
 239 /**
 240  * Check for compatible target
 241  * If an error is found, record it with _mesa_error()
 242  * \return false if any error, true otherwise.
 243  */
 244 static bool
 245 target_valid(struct gl_context *ctx, GLenum origTarget, GLenum newTarget)
 246 {
 247    /*
 248     * From ARB_texture_view spec:
 249    ---------------------------------------------------------------------------------------------------------
 250    | Original target              | Valid new targets |
 251    ---------------------------------------------------------------------------------------------------------
 252    | TEXTURE_1D                   | TEXTURE_1D, TEXTURE_1D_ARRAY |
 253    | ------------------------------------------------------------------------------------------------------- |
 254    | TEXTURE_2D                   | TEXTURE_2D, TEXTURE_2D_ARRAY |
 255    | ------------------------------------------------------------------------------------------------------- |
 256    | TEXTURE_3D                   | TEXTURE_3D |
 257    | ------------------------------------------------------------------------------------------------------- |
 258    | TEXTURE_CUBE_MAP             | TEXTURE_CUBE_MAP, TEXTURE_2D, TEXTURE_2D_ARRAY, TEXTURE_CUBE_MAP_ARRAY |
 259    | ------------------------------------------------------------------------------------------------------- |
 260    | TEXTURE_RECTANGLE            | TEXTURE_RECTANGLE |
 261    | ------------------------------------------------------------------------------------------------------- |
 262    | TEXTURE_BUFFER               | <none> |
 263    | ------------------------------------------------------------------------------------------------------- |
 264    | TEXTURE_1D_ARRAY             | TEXTURE_1D_ARRAY, TEXTURE_1D |
 265    | ------------------------------------------------------------------------------------------------------- |
 266    | TEXTURE_2D_ARRAY             | TEXTURE_2D_ARRAY, TEXTURE_2D, TEXTURE_CUBE_MAP, TEXTURE_CUBE_MAP_ARRAY |
 267    | ------------------------------------------------------------------------------------------------------- |
 268    | TEXTURE_CUBE_MAP_ARRAY       | TEXTURE_CUBE_MAP_ARRAY, TEXTURE_2D_ARRAY, TEXTURE_2D, TEXTURE_CUBE_MAP |
 269    | ------------------------------------------------------------------------------------------------------- |
 270    | TEXTURE_2D_MULTISAMPLE       | TEXTURE_2D_MULTISAMPLE, TEXTURE_2D_MULTISAMPLE_ARRAY |
 271    | ------------------------------------------------------------------------------------------------------- |
 272    | TEXTURE_2D_MULTISAMPLE_ARRAY | TEXTURE_2D_MULTISAMPLE, TEXTURE_2D_MULTISAMPLE_ARRAY |
 273    ---------------------------------------------------------------------------------------------------------
 274     */
 275
 276    switch (origTarget) {
 277    case GL_TEXTURE_1D:
 278    case GL_TEXTURE_1D_ARRAY:
 279       RETURN_IF_SUPPORTED(TEXTURE_1D);
 280       RETURN_IF_SUPPORTED(TEXTURE_1D_ARRAY);
 281       break;
 282    case GL_TEXTURE_2D:
 283       RETURN_IF_SUPPORTED(TEXTURE_2D);
 284       RETURN_IF_SUPPORTED(TEXTURE_2D_ARRAY);
 285       break;
 286    case GL_TEXTURE_3D:
 287       RETURN_IF_SUPPORTED(TEXTURE_3D);
 288       break;
 289    case GL_TEXTURE_RECTANGLE:
 290       RETURN_IF_SUPPORTED(TEXTURE_RECTANGLE);
 291       break;
 292    case GL_TEXTURE_CUBE_MAP:
 293    case GL_TEXTURE_2D_ARRAY:
 294    case GL_TEXTURE_CUBE_MAP_ARRAY:
 295       RETURN_IF_SUPPORTED(TEXTURE_2D);
 296       RETURN_IF_SUPPORTED(TEXTURE_2D_ARRAY);
 297       RETURN_IF_SUPPORTED(TEXTURE_CUBE_MAP);
 298       RETURN_IF_SUPPORTED(TEXTURE_CUBE_MAP_ARRAY);
 299       break;
 300    case GL_TEXTURE_2D_MULTISAMPLE:
 301    case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
 302       RETURN_IF_SUPPORTED(TEXTURE_2D_MULTISAMPLE);
 303       RETURN_IF_SUPPORTED(TEXTURE_2D_MULTISAMPLE_ARRAY);
 304       break;
 305    }
 306    _mesa_error(ctx, GL_INVALID_OPERATION,
 307                "glTextureView(illegal target=%s)",
 308                _mesa_lookup_enum_by_nr(newTarget));
 309    return false;
 310 }
 311 #undef RETURN_IF_SUPPORTED
 312
 313 /**
 314  * Check for compatible format
 315  * If an error is found, record it with _mesa_error()
 316  * \return false if any error, true otherwise.
 317  */
 318 static bool
 319 compatible_format(struct gl_context *ctx, const struct gl_texture_object *origTexObj,
 320                   GLenum internalformat)
 321 {
 322    /* Level 0 of a texture created by glTextureStorage or glTextureView
 323     * is always defined.
 324     */
 325    struct gl_texture_image *texImage = origTexObj->Image[0][0];
 326    GLint origInternalFormat = texImage->InternalFormat;
 327    unsigned int origViewClass, newViewClass;
 328
 329    /* The two textures' internal formats must be compatible according to
 330     * Table 3.X.2 (Compatible internal formats for TextureView)
 331     * if the internal format exists in that table the view class must match.
 332     * The internal formats must be identical if not in that table,
 333     * or an INVALID_OPERATION error is generated.
 334     */
 335    if (origInternalFormat == internalformat)
 336       return true;
 337
 338    origViewClass = lookup_view_class(ctx, origInternalFormat);
 339    newViewClass = lookup_view_class(ctx, internalformat);
 340    if ((origViewClass == newViewClass) && origViewClass != false)
 341       return true;
 342
 343    _mesa_error(ctx, GL_INVALID_OPERATION,
 344                "glTextureView(internalformat %s not compatible with origtexture %s)",
 345                _mesa_lookup_enum_by_nr(internalformat),
 346                _mesa_lookup_enum_by_nr(origInternalFormat));
 347    return false;
 348 }
 349 /**
 350  * Helper function for TexStorage and teximagemultisample to set immutable
 351  * texture state needed by ARB_texture_view.
 352  */
 353 void
 354 _mesa_set_texture_view_state(struct gl_context *ctx,
 355                              struct gl_texture_object *texObj,
 356                              GLenum target, GLuint levels)
 357 {
 358    struct gl_texture_image *texImage;
 359
 360    /* Get a reference to what will become this View's base level */
 361    texImage = _mesa_select_tex_image(ctx, texObj, target, 0);
 362
 363    /* When an immutable texture is created via glTexStorage or glTexImageMultisample,
 364     * TEXTURE_IMMUTABLE_FORMAT becomes TRUE.
 365     * TEXTURE_IMMUTABLE_LEVELS and TEXTURE_VIEW_NUM_LEVELS become levels.
 366     * If the texture target is TEXTURE_1D_ARRAY then
 367     * TEXTURE_VIEW_NUM_LAYERS becomes height.
 368     * If the texture target is TEXTURE_2D_ARRAY, TEXTURE_CUBE_MAP_ARRAY,
 369     * or TEXTURE_2D_MULTISAMPLE_ARRAY then TEXTURE_VIEW_NUM_LAYERS becomes depth.
 370     * If the texture target is TEXTURE_CUBE_MAP, then
 371     * TEXTURE_VIEW_NUM_LAYERS becomes 6.
 372     * For any other texture target, TEXTURE_VIEW_NUM_LAYERS becomes 1.
 373     *
 374     * ARB_texture_multisample: Multisample textures do
 375     * not have multiple image levels.
 376     */
 377
 378    texObj->Immutable = GL_TRUE;
 379    texObj->ImmutableLevels = levels;
 380    texObj->MinLevel = 0;
 381    texObj->NumLevels = levels;
 382    texObj->MinLayer = 0;
 383    texObj->NumLayers = 1;
 384    switch (target) {
 385    case GL_TEXTURE_1D_ARRAY:
 386       texObj->NumLayers = texImage->Height;
 387       break;
 388
 389    case GL_TEXTURE_2D_MULTISAMPLE:
 390       texObj->NumLevels = 1;
 391       texObj->ImmutableLevels = 1;
 392       break;
 393
 394    case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
 395       texObj->NumLevels = 1;
 396       texObj->ImmutableLevels = 1;
 397       /* fall through to set NumLayers */
 398
 399    case GL_TEXTURE_2D_ARRAY:
 400    case GL_TEXTURE_CUBE_MAP_ARRAY:
 401       texObj->NumLayers = texImage->Depth;
 402       break;
 403
 404    case GL_TEXTURE_CUBE_MAP:
 405       texObj->NumLayers = 6;
 406       break;
 407
 408    }
 409 }
 410
 411 /**
 412  * glTextureView (ARB_texture_view)
 413  * If an error is found, record it with _mesa_error()
 414  * \return none.
 415  */
 416 void GLAPIENTRY
 417 _mesa_TextureView(GLuint texture, GLenum target, GLuint origtexture,
 418                   GLenum internalformat,
 419                   GLuint minlevel, GLuint numlevels,
 420                   GLuint minlayer, GLuint numlayers)
 421 {
 422    struct gl_texture_object *texObj;
 423    struct gl_texture_object *origTexObj;
 424    struct gl_texture_image *origTexImage;
 425    GLuint newViewMinLevel, newViewMinLayer;
 426    GLuint newViewNumLevels, newViewNumLayers;
 427    GLsizei width, height, depth;
 428    gl_format texFormat;
 429    GLboolean sizeOK, dimensionsOK;
 430    GLenum faceTarget;
 431
 432    GET_CURRENT_CONTEXT(ctx);
 433
 434    if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE))
 435       _mesa_debug(ctx, "glTextureView %d %s %d %s %d %d %d %d\n",
 436                   texture, _mesa_lookup_enum_by_nr(target), origtexture,
 437                   _mesa_lookup_enum_by_nr(internalformat),
 438                   minlevel, numlevels, minlayer, numlayers);
 439
 440    if (origtexture == 0) {
 441       _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(origtexture = %u)", origtexture);
 442       return;
 443    }
 444
 445    /* Need original texture information to validate arguments */
 446    origTexObj = _mesa_lookup_texture(ctx, origtexture);
 447
 448    /* If <origtexture> is not the name of a texture, INVALID_VALUE is generated. */
 449    if (!origTexObj) {
 450       _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(origtexture = %u)", origtexture);
 451       return;
 452    }
 453
 454    /* If <origtexture>'s TEXTURE_IMMUTABLE_FORMAT value is not TRUE,
 455     * INVALID_OPERATION is generated.
 456     */
 457    if (!origTexObj->Immutable) {
 458       _mesa_error(ctx, GL_INVALID_OPERATION, "glTextureView(origtexture not immutable)");
 459       return;
 460    }
 461
 462    /* If <texture> is 0, INVALID_VALUE is generated. */
 463    if (texture == 0) {
 464       _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(texture = 0)");
 465       return;
 466    }
 467
 468    /* If <texture> is not a valid name returned by GenTextures,
 469     * the error INVALID_OPERATION is generated.
 470     */
 471    texObj = _mesa_lookup_texture(ctx, texture);
 472    if (texObj == NULL) {
 473       _mesa_error(ctx, GL_INVALID_OPERATION, "glTextureView(texture = %u non-gen name)", texture);
 474       return;
 475    }
 476
 477    /* If <texture> has already been bound and given a target, then
 478     * the error INVALID_OPERATION is generated.
 479     */
 480    if (texObj->Target) {
 481       _mesa_error(ctx, GL_INVALID_OPERATION, "glTextureView(texture = %u already bound)", texture);
 482       return;
 483    }
 484
 485    /* Check for compatible target */
 486    if (!target_valid(ctx, origTexObj->Target, target)) {
 487       return; /* error was recorded */
 488    }
 489
 490    /* minlevel and minlayer are relative to the view of origtexture
 491     * If minlevel or minlayer is greater than level or layer, respectively,
 492     * of origtexture return INVALID_VALUE.
 493     */
 494    newViewMinLevel = origTexObj->MinLevel + minlevel;
 495    newViewMinLayer = origTexObj->MinLayer + minlayer;
 496    if (newViewMinLevel >= (origTexObj->MinLevel + origTexObj->NumLevels)) {
 497       _mesa_error(ctx, GL_INVALID_VALUE,
 498                   "glTextureView(new minlevel (%d) > orig minlevel (%d) + orig numlevels (%d))",
 499                   newViewMinLevel, origTexObj->MinLevel, origTexObj->NumLevels);
 500       return;
 501    }
 502
 503    if (newViewMinLayer >= (origTexObj->MinLayer + origTexObj->NumLayers)) {
 504       _mesa_error(ctx, GL_INVALID_VALUE,
 505                   "glTextureView(new minlayer (%d) > orig minlayer (%d) + orig numlayers (%d))",
 506                   newViewMinLayer, origTexObj->MinLayer, origTexObj->NumLayers);
 507       return;
 508    }
 509
 510    if (!compatible_format(ctx, origTexObj, internalformat)) {
 511       return; /* Error logged */
 512    }
 513
 514    texFormat = _mesa_choose_texture_format(ctx, texObj, target, 0,
 515                                            internalformat, GL_NONE, GL_NONE);
 516    assert(texFormat != MESA_FORMAT_NONE);
 517    if (texFormat == MESA_FORMAT_NONE) return;
 518
 519    newViewNumLevels = MIN2(numlevels, origTexObj->NumLevels - minlevel);
 520    newViewNumLayers = MIN2(numlayers, origTexObj->NumLayers - minlayer);
 521
 522    faceTarget = origTexObj->Target;
 523    if (faceTarget == GL_TEXTURE_CUBE_MAP)
 524       faceTarget = GL_TEXTURE_CUBE_MAP_POSITIVE_X + minlayer;
 525
 526    /* Get a reference to what will become this View's base level */
 527    origTexImage = _mesa_select_tex_image(ctx, origTexObj,
 528                                          faceTarget, minlevel);
 529    width = origTexImage->Width;
 530    height = origTexImage->Height;
 531    depth = origTexImage->Depth;
 532
 533    /* Adjust width, height, depth to be appropriate for new target */
 534    switch (target) {
 535    case GL_TEXTURE_1D:
 536    case GL_TEXTURE_3D:
 537       break;
 538
 539    case GL_TEXTURE_1D_ARRAY:
 540       height = (GLsizei) newViewNumLayers;
 541       break;
 542
 543    case GL_TEXTURE_2D:
 544    case GL_TEXTURE_2D_MULTISAMPLE:
 545    case GL_TEXTURE_RECTANGLE:
 546    case GL_TEXTURE_CUBE_MAP:
 547       depth = 1;
 548       break;
 549
 550    case GL_TEXTURE_2D_ARRAY:
 551    case GL_TEXTURE_CUBE_MAP_ARRAY:
 552    case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
 553       depth = newViewNumLayers;
 554       break;
 555    }
 556
 557    /* If the dimensions of the original texture are larger than the maximum
 558     * supported dimensions of the new target, the error INVALID_OPERATION is
 559     * generated. For example, if the original texture has a TEXTURE_2D_ARRAY
 560     * target and its width is greater than MAX_CUBE_MAP_TEXTURE_SIZE, an error
 561     * will be generated if TextureView is called to create a TEXTURE_CUBE_MAP
 562     * view.
 563     */
 564    dimensionsOK = _mesa_legal_texture_dimensions(ctx, target, 0,
 565                                                  width, height, depth, 0);
 566    if (!dimensionsOK) {
 567       _mesa_error(ctx, GL_INVALID_OPERATION, "glTextureView(invalid width or height or depth)");
 568       return;
 569    }
 570
 571    sizeOK = ctx->Driver.TestProxyTexImage(ctx, target, 0, texFormat,
 572                                           width, height, depth, 0);
 573    if (!sizeOK) {
 574       _mesa_error(ctx, GL_INVALID_OPERATION, "glTextureView(invalid texture size)");
 575       return;
 576    }
 577
 578    /* If <target> is TEXTURE_1D, TEXTURE_2D, TEXTURE_3D, TEXTURE_RECTANGLE,
 579     * or TEXTURE_2D_MULTISAMPLE and <numlayers> does not equal 1, the error
 580     * INVALID_VALUE is generated.
 581     */
 582    switch (target) {
 583    case GL_TEXTURE_1D:
 584    case GL_TEXTURE_2D:
 585    case GL_TEXTURE_3D:
 586    case GL_TEXTURE_RECTANGLE:
 587    case GL_TEXTURE_2D_MULTISAMPLE:
 588       if (numlayers != 1) {
 589          _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(numlayers %d != 1)", numlayers);
 590          return;
 591       }
 592       break;
 593
 594    case GL_TEXTURE_CUBE_MAP:
 595       /* If the new texture's target is TEXTURE_CUBE_MAP, the clamped <numlayers>
 596        * must be equal to 6.
 597        */
 598       if (newViewNumLayers != 6) {
 599          _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(clamped numlayers %d != 6)",
 600                      newViewNumLayers);
 601          return;
 602       }
 603       break;
 604
 605    case GL_TEXTURE_CUBE_MAP_ARRAY:
 606       /* If the new texture's target is TEXTURE_CUBE_MAP_ARRAY,
 607        * then <numlayers> counts layer-faces rather than layers,
 608        * and the clamped <numlayers> must be a multiple of 6.
 609        * Otherwise, the error INVALID_VALUE is generated.
 610        */
 611       if ((newViewNumLayers % 6) != 0) {
 612          _mesa_error(ctx, GL_INVALID_VALUE,
 613                      "glTextureView(clamped numlayers %d is not a multiple of 6)",
 614                      newViewNumLayers);
 615          return;
 616       }
 617       break;
 618    }
 619
 620    /* If the new texture's target is TEXTURE_CUBE_MAP or
 621     * TEXTURE_CUBE_MAP_ARRAY, the width and height of the original texture's
 622     * levels must be equal otherwise the error INVALID_OPERATION is generated.
 623     */
 624    if ((target == GL_TEXTURE_CUBE_MAP || target == GL_TEXTURE_CUBE_MAP_ARRAY) &&
 625        (origTexImage->Width != origTexImage->Height)) {
 626       _mesa_error(ctx, GL_INVALID_OPERATION, "glTextureView(origtexture width (%d) != height (%d))",
 627                   origTexImage->Width, origTexImage->Height);
 628       return;
 629    }
 630
 631    /* When the original texture's target is TEXTURE_CUBE_MAP, the layer
 632     * parameters are interpreted in the same order as if it were a
 633     * TEXTURE_CUBE_MAP_ARRAY with 6 layer-faces.
 634     */
 635
 636    /* If the internal format does not exactly match the internal format of the
 637     * original texture, the contents of the memory are reinterpreted in the
 638     * same manner as for image bindings described in
 639     * section 3.9.20 (Texture Image Loads and Stores).
 640     */
 641
 642    /* TEXTURE_BASE_LEVEL and TEXTURE_MAX_LEVEL are interpreted
 643     * relative to the view and not relative to the original data store.
 644     */
 645
 646    if (!initialize_texture_fields(ctx, target, texObj, newViewNumLevels,
 647                                   width, height, depth,
 648                                   internalformat, texFormat)) {
 649       return; /* Already recorded error */
 650    }
 651
 652    texObj->MinLevel = newViewMinLevel;
 653    texObj->MinLayer = newViewMinLayer;
 654    texObj->NumLevels = newViewNumLevels;
 655    texObj->NumLayers = newViewNumLayers;
 656    texObj->Immutable = GL_TRUE;
 657    texObj->ImmutableLevels = origTexObj->ImmutableLevels;
 658    texObj->Target = target;
 659
 660    if (ctx->Driver.TextureView != NULL && !ctx->Driver.TextureView(ctx, texObj, origTexObj)) {
 661       return; /* driver recorded error */
 662    }
 663 }