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
  86 #define VIEW_CLASS_GLES(x)             (GL_VIEW_CLASS_BPTC_FLOAT + 1 + x)
  87 #define VIEW_CLASS_EAC_R11             VIEW_CLASS_GLES(0)
  88 #define VIEW_CLASS_EAC_RG11            VIEW_CLASS_GLES(1)
  89 #define VIEW_CLASS_ETC2_RGB            VIEW_CLASS_GLES(2)
  90 #define VIEW_CLASS_ETC2_RGBA           VIEW_CLASS_GLES(3)
  91 #define VIEW_CLASS_ETC2_EAC_RGBA       VIEW_CLASS_GLES(4)
  92 #define VIEW_CLASS_ASTC_4x4_RGBA       VIEW_CLASS_GLES(5)
  93 #define VIEW_CLASS_ASTC_5x4_RGBA       VIEW_CLASS_GLES(6)
  94 #define VIEW_CLASS_ASTC_5x5_RGBA       VIEW_CLASS_GLES(7)
  95 #define VIEW_CLASS_ASTC_6x5_RGBA       VIEW_CLASS_GLES(8)
  96 #define VIEW_CLASS_ASTC_6x6_RGBA       VIEW_CLASS_GLES(9)
  97 #define VIEW_CLASS_ASTC_8x5_RGBA       VIEW_CLASS_GLES(10)
  98 #define VIEW_CLASS_ASTC_8x6_RGBA       VIEW_CLASS_GLES(11)
  99 #define VIEW_CLASS_ASTC_8x8_RGBA       VIEW_CLASS_GLES(12)
 100 #define VIEW_CLASS_ASTC_10x5_RGBA      VIEW_CLASS_GLES(13)
 101 #define VIEW_CLASS_ASTC_10x6_RGBA      VIEW_CLASS_GLES(14)
 102 #define VIEW_CLASS_ASTC_10x8_RGBA      VIEW_CLASS_GLES(15)
 103 #define VIEW_CLASS_ASTC_10x10_RGBA     VIEW_CLASS_GLES(16)
 104 #define VIEW_CLASS_ASTC_12x10_RGBA     VIEW_CLASS_GLES(17)
 105 #define VIEW_CLASS_ASTC_12x12_RGBA     VIEW_CLASS_GLES(18)
 106 #define VIEW_CLASS_ASTC_3x3x3_RGBA     VIEW_CLASS_GLES(19)
 107 #define VIEW_CLASS_ASTC_4x3x3_RGBA     VIEW_CLASS_GLES(20)
 108 #define VIEW_CLASS_ASTC_4x4x3_RGBA     VIEW_CLASS_GLES(21)
 109 #define VIEW_CLASS_ASTC_4x4x4_RGBA     VIEW_CLASS_GLES(22)
 110 #define VIEW_CLASS_ASTC_5x4x4_RGBA     VIEW_CLASS_GLES(23)
 111 #define VIEW_CLASS_ASTC_5x5x4_RGBA     VIEW_CLASS_GLES(24)
 112 #define VIEW_CLASS_ASTC_5x5x5_RGBA     VIEW_CLASS_GLES(25)
 113 #define VIEW_CLASS_ASTC_6x5x5_RGBA     VIEW_CLASS_GLES(26)
 114 #define VIEW_CLASS_ASTC_6x6x5_RGBA     VIEW_CLASS_GLES(27)
 115 #define VIEW_CLASS_ASTC_6x6x6_RGBA     VIEW_CLASS_GLES(28)
 116
 117
 118 struct internal_format_class_info {
 119    GLenum view_class;
 120    GLenum internal_format;
 121 };
 122 static const struct internal_format_class_info compatible_internal_formats[] = {
 123    {GL_VIEW_CLASS_128_BITS, GL_RGBA32F},
 124    {GL_VIEW_CLASS_128_BITS, GL_RGBA32UI},
 125    {GL_VIEW_CLASS_128_BITS, GL_RGBA32I},
 126    {GL_VIEW_CLASS_96_BITS, GL_RGB32F},
 127    {GL_VIEW_CLASS_96_BITS, GL_RGB32UI},
 128    {GL_VIEW_CLASS_96_BITS, GL_RGB32I},
 129    {GL_VIEW_CLASS_64_BITS, GL_RGBA16F},
 130    {GL_VIEW_CLASS_64_BITS, GL_RG32F},
 131    {GL_VIEW_CLASS_64_BITS, GL_RGBA16UI},
 132    {GL_VIEW_CLASS_64_BITS, GL_RG32UI},
 133    {GL_VIEW_CLASS_64_BITS, GL_RGBA16I},
 134    {GL_VIEW_CLASS_64_BITS, GL_RG32I},
 135    {GL_VIEW_CLASS_64_BITS, GL_RGBA16},
 136    {GL_VIEW_CLASS_64_BITS, GL_RGBA16_SNORM},
 137    {GL_VIEW_CLASS_48_BITS, GL_RGB16},
 138    {GL_VIEW_CLASS_48_BITS, GL_RGB16_SNORM},
 139    {GL_VIEW_CLASS_48_BITS, GL_RGB16F},
 140    {GL_VIEW_CLASS_48_BITS, GL_RGB16UI},
 141    {GL_VIEW_CLASS_48_BITS, GL_RGB16I},
 142    {GL_VIEW_CLASS_32_BITS, GL_RG16F},
 143    {GL_VIEW_CLASS_32_BITS, GL_R11F_G11F_B10F},
 144    {GL_VIEW_CLASS_32_BITS, GL_R32F},
 145    {GL_VIEW_CLASS_32_BITS, GL_RGB10_A2UI},
 146    {GL_VIEW_CLASS_32_BITS, GL_RGBA8UI},
 147    {GL_VIEW_CLASS_32_BITS, GL_RG16UI},
 148    {GL_VIEW_CLASS_32_BITS, GL_R32UI},
 149    {GL_VIEW_CLASS_32_BITS, GL_RGBA8I},
 150    {GL_VIEW_CLASS_32_BITS, GL_RG16I},
 151    {GL_VIEW_CLASS_32_BITS, GL_R32I},
 152    {GL_VIEW_CLASS_32_BITS, GL_RGB10_A2},
 153    {GL_VIEW_CLASS_32_BITS, GL_RGBA8},
 154    {GL_VIEW_CLASS_32_BITS, GL_RG16},
 155    {GL_VIEW_CLASS_32_BITS, GL_RGBA8_SNORM},
 156    {GL_VIEW_CLASS_32_BITS, GL_RG16_SNORM},
 157    {GL_VIEW_CLASS_32_BITS, GL_SRGB8_ALPHA8},
 158    {GL_VIEW_CLASS_32_BITS, GL_RGB9_E5},
 159    {GL_VIEW_CLASS_24_BITS, GL_RGB8},
 160    {GL_VIEW_CLASS_24_BITS, GL_RGB8_SNORM},
 161    {GL_VIEW_CLASS_24_BITS, GL_SRGB8},
 162    {GL_VIEW_CLASS_24_BITS, GL_RGB8UI},
 163    {GL_VIEW_CLASS_24_BITS, GL_RGB8I},
 164    {GL_VIEW_CLASS_16_BITS, GL_R16F},
 165    {GL_VIEW_CLASS_16_BITS, GL_RG8UI},
 166    {GL_VIEW_CLASS_16_BITS, GL_R16UI},
 167    {GL_VIEW_CLASS_16_BITS, GL_RG8I},
 168    {GL_VIEW_CLASS_16_BITS, GL_R16I},
 169    {GL_VIEW_CLASS_16_BITS, GL_RG8},
 170    {GL_VIEW_CLASS_16_BITS, GL_R16},
 171    {GL_VIEW_CLASS_16_BITS, GL_RG8_SNORM},
 172    {GL_VIEW_CLASS_16_BITS, GL_R16_SNORM},
 173    {GL_VIEW_CLASS_8_BITS, GL_R8UI},
 174    {GL_VIEW_CLASS_8_BITS, GL_R8I},
 175    {GL_VIEW_CLASS_8_BITS, GL_R8},
 176    {GL_VIEW_CLASS_8_BITS, GL_R8_SNORM},
 177    {GL_VIEW_CLASS_RGTC1_RED, GL_COMPRESSED_RED_RGTC1},
 178    {GL_VIEW_CLASS_RGTC1_RED, GL_COMPRESSED_SIGNED_RED_RGTC1},
 179    {GL_VIEW_CLASS_RGTC2_RG, GL_COMPRESSED_RG_RGTC2},
 180    {GL_VIEW_CLASS_RGTC2_RG, GL_COMPRESSED_SIGNED_RG_RGTC2},
 181    {GL_VIEW_CLASS_BPTC_UNORM, GL_COMPRESSED_RGBA_BPTC_UNORM_ARB},
 182    {GL_VIEW_CLASS_BPTC_UNORM, GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB},
 183    {GL_VIEW_CLASS_BPTC_FLOAT, GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_ARB},
 184    {GL_VIEW_CLASS_BPTC_FLOAT, GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_ARB},
 185 };
 186
 187 static const struct internal_format_class_info s3tc_compatible_internal_formats[] = {
 188    {GL_VIEW_CLASS_S3TC_DXT1_RGB, GL_COMPRESSED_RGB_S3TC_DXT1_EXT},
 189    {GL_VIEW_CLASS_S3TC_DXT1_RGB, GL_COMPRESSED_SRGB_S3TC_DXT1_EXT},
 190    {GL_VIEW_CLASS_S3TC_DXT1_RGBA, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT},
 191    {GL_VIEW_CLASS_S3TC_DXT1_RGBA, GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT},
 192    {GL_VIEW_CLASS_S3TC_DXT3_RGBA, GL_COMPRESSED_RGBA_S3TC_DXT3_EXT},
 193    {GL_VIEW_CLASS_S3TC_DXT3_RGBA, GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT},
 194    {GL_VIEW_CLASS_S3TC_DXT5_RGBA, GL_COMPRESSED_RGBA_S3TC_DXT5_EXT},
 195    {GL_VIEW_CLASS_S3TC_DXT5_RGBA, GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT},
 196 };
 197
 198 static const struct internal_format_class_info gles_etc2_compatible_internal_formats[] = {
 199    {VIEW_CLASS_EAC_R11, GL_COMPRESSED_R11_EAC},
 200    {VIEW_CLASS_EAC_R11, GL_COMPRESSED_SIGNED_R11_EAC},
 201    {VIEW_CLASS_EAC_RG11, GL_COMPRESSED_RG11_EAC},
 202    {VIEW_CLASS_EAC_RG11, GL_COMPRESSED_SIGNED_RG11_EAC},
 203    {VIEW_CLASS_ETC2_RGB, GL_COMPRESSED_RGB8_ETC2},
 204    {VIEW_CLASS_ETC2_RGB, GL_COMPRESSED_SRGB8_ETC2},
 205    {VIEW_CLASS_ETC2_RGBA, GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2},
 206    {VIEW_CLASS_ETC2_RGBA, GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2},
 207    {VIEW_CLASS_ETC2_EAC_RGBA, GL_COMPRESSED_RGBA8_ETC2_EAC},
 208    {VIEW_CLASS_ETC2_EAC_RGBA, GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC},
 209 };
 210
 211 static const struct internal_format_class_info gles_astc_compatible_internal_formats[] = {
 212 #define ASTC_FMT(size) \
 213    {VIEW_CLASS_ASTC_##size## _RGBA, GL_COMPRESSED_RGBA_ASTC_##size##_KHR}, \
 214    {VIEW_CLASS_ASTC_##size##_RGBA, GL_COMPRESSED_SRGB8_ALPHA8_ASTC_##size##_KHR}
 215
 216    ASTC_FMT(4x4),
 217    ASTC_FMT(5x4),
 218    ASTC_FMT(5x5),
 219    ASTC_FMT(6x5),
 220    ASTC_FMT(6x6),
 221    ASTC_FMT(8x5),
 222    ASTC_FMT(8x6),
 223    ASTC_FMT(8x8),
 224    ASTC_FMT(10x5),
 225    ASTC_FMT(10x6),
 226    ASTC_FMT(10x8),
 227    ASTC_FMT(10x10),
 228    ASTC_FMT(12x10),
 229    ASTC_FMT(12x12),
 230 #undef ASTC_FMT
 231 };
 232
 233 GLenum
 234 _mesa_texture_view_lookup_view_class(const struct gl_context *ctx, GLenum internalformat)
 235 {
 236    GLuint i;
 237
 238    for (i = 0; i < ARRAY_SIZE(compatible_internal_formats); i++) {
 239       if (compatible_internal_formats[i].internal_format == internalformat)
 240          return compatible_internal_formats[i].view_class;
 241    }
 242
 243    if (ctx->Extensions.EXT_texture_compression_s3tc &&
 244        ctx->Extensions.EXT_texture_sRGB) {
 245       for (i = 0; i < ARRAY_SIZE(s3tc_compatible_internal_formats); i++) {
 246          if (s3tc_compatible_internal_formats[i].internal_format
 247              == internalformat)
 248             return s3tc_compatible_internal_formats[i].view_class;
 249       }
 250    }
 251
 252    if (_mesa_is_gles3(ctx)) {
 253       for (i = 0; i < ARRAY_SIZE(gles_etc2_compatible_internal_formats); i++) {
 254          if (gles_etc2_compatible_internal_formats[i].internal_format
 255              == internalformat)
 256             return gles_etc2_compatible_internal_formats[i].view_class;
 257       }
 258
 259       if (ctx->Extensions.KHR_texture_compression_astc_ldr) {
 260          for (i = 0; i < ARRAY_SIZE(gles_astc_compatible_internal_formats); i++) {
 261             if (gles_astc_compatible_internal_formats[i].internal_format
 262                 == internalformat)
 263                return gles_astc_compatible_internal_formats[i].view_class;
 264          }
 265       }
 266
 267       /* FINISHME: Add 3D OES formats when supported */
 268    }
 269    return GL_FALSE;
 270 }
 271
 272 /**
 273  * Initialize new texture's gl_texture_image structures. Will not call driver
 274  * to allocate new space, simply record relevant layer, face, format, etc.
 275  * \return GL_FALSE if any error, GL_TRUE otherwise.
 276  */
 277 static GLboolean
 278 initialize_texture_fields(struct gl_context *ctx,
 279                           GLenum target,
 280                           struct gl_texture_object *texObj,
 281                           GLint levels,
 282                           GLsizei width, GLsizei height, GLsizei depth,
 283                           GLenum internalFormat, mesa_format texFormat)
 284 {
 285    const GLuint numFaces = _mesa_num_tex_faces(target);
 286    GLint level, levelWidth = width, levelHeight = height, levelDepth = depth;
 287    GLuint face;
 288
 289    /* Pretend we are bound to initialize the gl_texture_image structs */
 290    texObj->Target = target;
 291
 292    /* Set up all the texture object's gl_texture_images */
 293    for (level = 0; level < levels; level++) {
 294       for (face = 0; face < numFaces; face++) {
 295          struct gl_texture_image *texImage;
 296          const GLenum faceTarget = _mesa_cube_face_target(target, face);
 297
 298          texImage = _mesa_get_tex_image(ctx, texObj, faceTarget, level);
 299
 300          if (!texImage) {
 301             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glTexStorage");
 302             return GL_FALSE;
 303          }
 304
 305          _mesa_init_teximage_fields(ctx, texImage,
 306                                     levelWidth, levelHeight, levelDepth,
 307                                     0, internalFormat, texFormat);
 308       }
 309
 310       _mesa_next_mipmap_level_size(target, 0,
 311                                    levelWidth, levelHeight, levelDepth,
 312                                    &levelWidth, &levelHeight, &levelDepth);
 313    }
 314
 315    /* "unbind" */
 316    texObj->Target = 0;
 317
 318    return GL_TRUE;
 319 }
 320
 321 #define RETURN_IF_SUPPORTED(t) do {             \
 322    if (newTarget == GL_ ## t)                   \
 323       return true;                              \
 324 } while (0)
 325
 326 /**
 327  * Check for compatible target
 328  * If an error is found, record it with _mesa_error()
 329  * \return false if any error, true otherwise.
 330  */
 331 static bool
 332 target_valid(struct gl_context *ctx, GLenum origTarget, GLenum newTarget)
 333 {
 334    /*
 335     * From ARB_texture_view spec:
 336    ---------------------------------------------------------------------------------------------------------
 337    | Original target              | Valid new targets |
 338    ---------------------------------------------------------------------------------------------------------
 339    | TEXTURE_1D                   | TEXTURE_1D, TEXTURE_1D_ARRAY |
 340    | ------------------------------------------------------------------------------------------------------- |
 341    | TEXTURE_2D                   | TEXTURE_2D, TEXTURE_2D_ARRAY |
 342    | ------------------------------------------------------------------------------------------------------- |
 343    | TEXTURE_3D                   | TEXTURE_3D |
 344    | ------------------------------------------------------------------------------------------------------- |
 345    | TEXTURE_CUBE_MAP             | TEXTURE_CUBE_MAP, TEXTURE_2D, TEXTURE_2D_ARRAY, TEXTURE_CUBE_MAP_ARRAY |
 346    | ------------------------------------------------------------------------------------------------------- |
 347    | TEXTURE_RECTANGLE            | TEXTURE_RECTANGLE |
 348    | ------------------------------------------------------------------------------------------------------- |
 349    | TEXTURE_BUFFER               | <none> |
 350    | ------------------------------------------------------------------------------------------------------- |
 351    | TEXTURE_1D_ARRAY             | TEXTURE_1D_ARRAY, TEXTURE_1D |
 352    | ------------------------------------------------------------------------------------------------------- |
 353    | TEXTURE_2D_ARRAY             | TEXTURE_2D_ARRAY, TEXTURE_2D, TEXTURE_CUBE_MAP, TEXTURE_CUBE_MAP_ARRAY |
 354    | ------------------------------------------------------------------------------------------------------- |
 355    | TEXTURE_CUBE_MAP_ARRAY       | TEXTURE_CUBE_MAP_ARRAY, TEXTURE_2D_ARRAY, TEXTURE_2D, TEXTURE_CUBE_MAP |
 356    | ------------------------------------------------------------------------------------------------------- |
 357    | TEXTURE_2D_MULTISAMPLE       | TEXTURE_2D_MULTISAMPLE, TEXTURE_2D_MULTISAMPLE_ARRAY |
 358    | ------------------------------------------------------------------------------------------------------- |
 359    | TEXTURE_2D_MULTISAMPLE_ARRAY | TEXTURE_2D_MULTISAMPLE, TEXTURE_2D_MULTISAMPLE_ARRAY |
 360    ---------------------------------------------------------------------------------------------------------
 361     */
 362
 363    switch (origTarget) {
 364    case GL_TEXTURE_1D:
 365    case GL_TEXTURE_1D_ARRAY:
 366       RETURN_IF_SUPPORTED(TEXTURE_1D);
 367       RETURN_IF_SUPPORTED(TEXTURE_1D_ARRAY);
 368       break;
 369    case GL_TEXTURE_2D:
 370       RETURN_IF_SUPPORTED(TEXTURE_2D);
 371       RETURN_IF_SUPPORTED(TEXTURE_2D_ARRAY);
 372       break;
 373    case GL_TEXTURE_3D:
 374       RETURN_IF_SUPPORTED(TEXTURE_3D);
 375       break;
 376    case GL_TEXTURE_RECTANGLE:
 377       RETURN_IF_SUPPORTED(TEXTURE_RECTANGLE);
 378       break;
 379    case GL_TEXTURE_CUBE_MAP:
 380    case GL_TEXTURE_2D_ARRAY:
 381    case GL_TEXTURE_CUBE_MAP_ARRAY:
 382       RETURN_IF_SUPPORTED(TEXTURE_2D);
 383       RETURN_IF_SUPPORTED(TEXTURE_2D_ARRAY);
 384       RETURN_IF_SUPPORTED(TEXTURE_CUBE_MAP);
 385       RETURN_IF_SUPPORTED(TEXTURE_CUBE_MAP_ARRAY);
 386       break;
 387    case GL_TEXTURE_2D_MULTISAMPLE:
 388    case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
 389       RETURN_IF_SUPPORTED(TEXTURE_2D_MULTISAMPLE);
 390       RETURN_IF_SUPPORTED(TEXTURE_2D_MULTISAMPLE_ARRAY);
 391       break;
 392    }
 393    _mesa_error(ctx, GL_INVALID_OPERATION,
 394                "glTextureView(illegal target=%s)",
 395                _mesa_enum_to_string(newTarget));
 396    return false;
 397 }
 398 #undef RETURN_IF_SUPPORTED
 399
 400 /**
 401  * Check for compatible format
 402  * If an error is found, record it with _mesa_error()
 403  * \return false if any error, true otherwise.
 404  */
 405 bool
 406 _mesa_texture_view_compatible_format(const struct gl_context *ctx,
 407                                      GLenum origInternalFormat,
 408                                      GLenum newInternalFormat)
 409 {
 410    unsigned int origViewClass, newViewClass;
 411
 412    /* The two textures' internal formats must be compatible according to
 413     * Table 3.X.2 (Compatible internal formats for TextureView)
 414     * if the internal format exists in that table the view class must match.
 415     * The internal formats must be identical if not in that table,
 416     * or an INVALID_OPERATION error is generated.
 417     */
 418    if (origInternalFormat == newInternalFormat)
 419       return true;
 420
 421    origViewClass = _mesa_texture_view_lookup_view_class(ctx, origInternalFormat);
 422    newViewClass = _mesa_texture_view_lookup_view_class(ctx, newInternalFormat);
 423    if ((origViewClass == newViewClass) && origViewClass != false)
 424       return true;
 425
 426    return false;
 427 }
 428
 429 /**
 430  * Helper function for TexStorage and teximagemultisample to set immutable
 431  * texture state needed by ARB_texture_view.
 432  */
 433 void
 434 _mesa_set_texture_view_state(struct gl_context *ctx,
 435                              struct gl_texture_object *texObj,
 436                              GLenum target, GLuint levels)
 437 {
 438    struct gl_texture_image *texImage;
 439
 440    /* Get a reference to what will become this View's base level */
 441    texImage = _mesa_select_tex_image(texObj, target, 0);
 442
 443    /* When an immutable texture is created via glTexStorage or
 444     * glTexImageMultisample,
 445     * TEXTURE_IMMUTABLE_FORMAT becomes TRUE.
 446     * TEXTURE_IMMUTABLE_LEVELS and TEXTURE_VIEW_NUM_LEVELS become levels.
 447     * If the texture target is TEXTURE_1D_ARRAY then
 448     * TEXTURE_VIEW_NUM_LAYERS becomes height.
 449     * If the texture target is TEXTURE_2D_ARRAY, TEXTURE_CUBE_MAP_ARRAY,
 450     * or TEXTURE_2D_MULTISAMPLE_ARRAY then TEXTURE_VIEW_NUM_LAYERS becomes
 451     * depth.
 452     * If the texture target is TEXTURE_CUBE_MAP, then
 453     * TEXTURE_VIEW_NUM_LAYERS becomes 6.
 454     * For any other texture target, TEXTURE_VIEW_NUM_LAYERS becomes 1.
 455     *
 456     * ARB_texture_multisample: Multisample textures do
 457     * not have multiple image levels.
 458     */
 459
 460    texObj->Immutable = GL_TRUE;
 461    texObj->ImmutableLevels = levels;
 462    texObj->MinLevel = 0;
 463    texObj->NumLevels = levels;
 464    texObj->MinLayer = 0;
 465    texObj->NumLayers = 1;
 466    switch (target) {
 467    case GL_TEXTURE_1D_ARRAY:
 468       texObj->NumLayers = texImage->Height;
 469       break;
 470
 471    case GL_TEXTURE_2D_MULTISAMPLE:
 472       texObj->NumLevels = 1;
 473       texObj->ImmutableLevels = 1;
 474       break;
 475
 476    case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
 477       texObj->NumLevels = 1;
 478       texObj->ImmutableLevels = 1;
 479       /* fall through to set NumLayers */
 480
 481    case GL_TEXTURE_2D_ARRAY:
 482    case GL_TEXTURE_CUBE_MAP_ARRAY:
 483       texObj->NumLayers = texImage->Depth;
 484       break;
 485
 486    case GL_TEXTURE_CUBE_MAP:
 487       texObj->NumLayers = 6;
 488       break;
 489    }
 490 }
 491
 492 /**
 493  * glTextureView (ARB_texture_view)
 494  * If an error is found, record it with _mesa_error()
 495  * \return none.
 496  */
 497 void GLAPIENTRY
 498 _mesa_TextureView(GLuint texture, GLenum target, GLuint origtexture,
 499                   GLenum internalformat,
 500                   GLuint minlevel, GLuint numlevels,
 501                   GLuint minlayer, GLuint numlayers)
 502 {
 503    struct gl_texture_object *texObj;
 504    struct gl_texture_object *origTexObj;
 505    struct gl_texture_image *origTexImage;
 506    GLuint newViewMinLevel, newViewMinLayer;
 507    GLuint newViewNumLevels, newViewNumLayers;
 508    GLsizei width, height, depth;
 509    mesa_format texFormat;
 510    GLboolean sizeOK, dimensionsOK;
 511    GLenum faceTarget;
 512
 513    GET_CURRENT_CONTEXT(ctx);
 514
 515    if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE))
 516       _mesa_debug(ctx, "glTextureView %d %s %d %s %d %d %d %d\n",
 517                   texture, _mesa_enum_to_string(target), origtexture,
 518                   _mesa_enum_to_string(internalformat),
 519                   minlevel, numlevels, minlayer, numlayers);
 520
 521    if (origtexture == 0) {
 522       _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(origtexture = %u)",
 523                   origtexture);
 524       return;
 525    }
 526
 527    /* Need original texture information to validate arguments */
 528    origTexObj = _mesa_lookup_texture(ctx, origtexture);
 529
 530    /* If <origtexture> is not the name of a texture, INVALID_VALUE
 531     * is generated.
 532     */
 533    if (!origTexObj) {
 534       _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(origtexture = %u)",
 535                   origtexture);
 536       return;
 537    }
 538
 539    /* If <origtexture>'s TEXTURE_IMMUTABLE_FORMAT value is not TRUE,
 540     * INVALID_OPERATION is generated.
 541     */
 542    if (!origTexObj->Immutable) {
 543       _mesa_error(ctx, GL_INVALID_OPERATION,
 544                   "glTextureView(origtexture not immutable)");
 545       return;
 546    }
 547
 548    /* If <texture> is 0, INVALID_VALUE is generated. */
 549    if (texture == 0) {
 550       _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(texture = 0)");
 551       return;
 552    }
 553
 554    /* If <texture> is not a valid name returned by GenTextures,
 555     * the error INVALID_OPERATION is generated.
 556     */
 557    texObj = _mesa_lookup_texture(ctx, texture);
 558    if (texObj == NULL) {
 559       _mesa_error(ctx, GL_INVALID_OPERATION,
 560                   "glTextureView(texture = %u non-gen name)", texture);
 561       return;
 562    }
 563
 564    /* If <texture> has already been bound and given a target, then
 565     * the error INVALID_OPERATION is generated.
 566     */
 567    if (texObj->Target) {
 568       _mesa_error(ctx, GL_INVALID_OPERATION,
 569                   "glTextureView(texture = %u already bound)", texture);
 570       return;
 571    }
 572
 573    /* Check for compatible target */
 574    if (!target_valid(ctx, origTexObj->Target, target)) {
 575       return; /* error was recorded */
 576    }
 577
 578    /* minlevel and minlayer are relative to the view of origtexture.
 579     * If minlevel or minlayer is greater than level or layer, respectively,
 580     * return INVALID_VALUE.
 581     */
 582    newViewMinLevel = origTexObj->MinLevel + minlevel;
 583    newViewMinLayer = origTexObj->MinLayer + minlayer;
 584    if (newViewMinLevel >= (origTexObj->MinLevel + origTexObj->NumLevels)) {
 585       _mesa_error(ctx, GL_INVALID_VALUE,
 586                   "glTextureView(new minlevel (%d) > orig minlevel (%d)"
 587                   " + orig numlevels (%d))",
 588                   newViewMinLevel, origTexObj->MinLevel, origTexObj->NumLevels);
 589       return;
 590    }
 591
 592    if (newViewMinLayer >= (origTexObj->MinLayer + origTexObj->NumLayers)) {
 593       _mesa_error(ctx, GL_INVALID_VALUE,
 594                   "glTextureView(new minlayer (%d) > orig minlayer (%d)"
 595                   " + orig numlayers (%d))",
 596                   newViewMinLayer, origTexObj->MinLayer, origTexObj->NumLayers);
 597       return;
 598    }
 599
 600    if (!_mesa_texture_view_compatible_format(ctx,
 601                                    origTexObj->Image[0][0]->InternalFormat,
 602                                    internalformat)) {
 603       _mesa_error(ctx, GL_INVALID_OPERATION,
 604           "glTextureView(internalformat %s not compatible with origtexture %s)",
 605           _mesa_enum_to_string(internalformat),
 606           _mesa_enum_to_string(origTexObj->Image[0][0]->InternalFormat));
 607       return;
 608    }
 609
 610    texFormat = _mesa_choose_texture_format(ctx, texObj, target, 0,
 611                                            internalformat, GL_NONE, GL_NONE);
 612    assert(texFormat != MESA_FORMAT_NONE);
 613    if (texFormat == MESA_FORMAT_NONE) return;
 614
 615    newViewNumLevels = MIN2(numlevels, origTexObj->NumLevels - minlevel);
 616    newViewNumLayers = MIN2(numlayers, origTexObj->NumLayers - minlayer);
 617
 618    faceTarget = _mesa_cube_face_target(origTexObj->Target, minlayer);
 619
 620    /* Get a reference to what will become this View's base level */
 621    origTexImage = _mesa_select_tex_image(origTexObj, faceTarget, minlevel);
 622    width = origTexImage->Width;
 623    height = origTexImage->Height;
 624    depth = origTexImage->Depth;
 625
 626    /* Adjust width, height, depth to be appropriate for new target */
 627    switch (target) {
 628    case GL_TEXTURE_1D:
 629       height = 1;
 630       break;
 631
 632    case GL_TEXTURE_3D:
 633       break;
 634
 635    case GL_TEXTURE_1D_ARRAY:
 636       height = (GLsizei) newViewNumLayers;
 637       break;
 638
 639    case GL_TEXTURE_2D:
 640    case GL_TEXTURE_2D_MULTISAMPLE:
 641    case GL_TEXTURE_RECTANGLE:
 642    case GL_TEXTURE_CUBE_MAP:
 643       depth = 1;
 644       break;
 645
 646    case GL_TEXTURE_2D_ARRAY:
 647    case GL_TEXTURE_CUBE_MAP_ARRAY:
 648    case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
 649       depth = newViewNumLayers;
 650       break;
 651    }
 652
 653    /* If the dimensions of the original texture are larger than the maximum
 654     * supported dimensions of the new target, the error INVALID_OPERATION is
 655     * generated. For example, if the original texture has a TEXTURE_2D_ARRAY
 656     * target and its width is greater than MAX_CUBE_MAP_TEXTURE_SIZE, an error
 657     * will be generated if TextureView is called to create a TEXTURE_CUBE_MAP
 658     * view.
 659     */
 660    dimensionsOK = _mesa_legal_texture_dimensions(ctx, target, 0,
 661                                                  width, height, depth, 0);
 662    if (!dimensionsOK) {
 663       _mesa_error(ctx, GL_INVALID_OPERATION,
 664                   "glTextureView(invalid width or height or depth)");
 665       return;
 666    }
 667
 668    sizeOK = ctx->Driver.TestProxyTexImage(ctx, target, 0, texFormat,
 669                                           width, height, depth, 0);
 670    if (!sizeOK) {
 671       _mesa_error(ctx, GL_INVALID_OPERATION,
 672                   "glTextureView(invalid texture size)");
 673       return;
 674    }
 675
 676    /* If <target> is TEXTURE_1D, TEXTURE_2D, TEXTURE_3D, TEXTURE_RECTANGLE,
 677     * or TEXTURE_2D_MULTISAMPLE and <numlayers> does not equal 1, the error
 678     * INVALID_VALUE is generated.
 679     */
 680    switch (target) {
 681    case GL_TEXTURE_1D:
 682    case GL_TEXTURE_2D:
 683    case GL_TEXTURE_3D:
 684    case GL_TEXTURE_RECTANGLE:
 685    case GL_TEXTURE_2D_MULTISAMPLE:
 686       if (numlayers != 1) {
 687          _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(numlayers %d != 1)",
 688                      numlayers);
 689          return;
 690       }
 691       break;
 692
 693    case GL_TEXTURE_CUBE_MAP:
 694       /* If the new texture's target is TEXTURE_CUBE_MAP, the clamped
 695        * <numlayers> must be equal to 6.
 696        */
 697       if (newViewNumLayers != 6) {
 698          _mesa_error(ctx, GL_INVALID_VALUE,
 699                      "glTextureView(clamped numlayers %d != 6)",
 700                      newViewNumLayers);
 701          return;
 702       }
 703       break;
 704
 705    case GL_TEXTURE_CUBE_MAP_ARRAY:
 706       /* If the new texture's target is TEXTURE_CUBE_MAP_ARRAY,
 707        * then <numlayers> counts layer-faces rather than layers,
 708        * and the clamped <numlayers> must be a multiple of 6.
 709        * Otherwise, the error INVALID_VALUE is generated.
 710        */
 711       if ((newViewNumLayers % 6) != 0) {
 712          _mesa_error(ctx, GL_INVALID_VALUE,
 713                      "glTextureView(clamped numlayers %d is not"
 714                      " a multiple of 6)",
 715                      newViewNumLayers);
 716          return;
 717       }
 718       break;
 719    }
 720
 721    /* If the new texture's target is TEXTURE_CUBE_MAP or
 722     * TEXTURE_CUBE_MAP_ARRAY, the width and height of the original texture's
 723     * levels must be equal otherwise the error INVALID_OPERATION is generated.
 724     */
 725    if ((target == GL_TEXTURE_CUBE_MAP || target == GL_TEXTURE_CUBE_MAP_ARRAY) &&
 726        (origTexImage->Width != origTexImage->Height)) {
 727       _mesa_error(ctx, GL_INVALID_OPERATION,
 728                   "glTextureView(origtexture width (%d) != height (%d))",
 729                   origTexImage->Width, origTexImage->Height);
 730       return;
 731    }
 732
 733    /* When the original texture's target is TEXTURE_CUBE_MAP, the layer
 734     * parameters are interpreted in the same order as if it were a
 735     * TEXTURE_CUBE_MAP_ARRAY with 6 layer-faces.
 736     */
 737
 738    /* If the internal format does not exactly match the internal format of the
 739     * original texture, the contents of the memory are reinterpreted in the
 740     * same manner as for image bindings described in
 741     * section 3.9.20 (Texture Image Loads and Stores).
 742     */
 743
 744    /* TEXTURE_BASE_LEVEL and TEXTURE_MAX_LEVEL are interpreted
 745     * relative to the view and not relative to the original data store.
 746     */
 747
 748    if (!initialize_texture_fields(ctx, target, texObj, newViewNumLevels,
 749                                   width, height, depth,
 750                                   internalformat, texFormat)) {
 751       return; /* Already recorded error */
 752    }
 753
 754    texObj->MinLevel = newViewMinLevel;
 755    texObj->MinLayer = newViewMinLayer;
 756    texObj->NumLevels = newViewNumLevels;
 757    texObj->NumLayers = newViewNumLayers;
 758    texObj->Immutable = GL_TRUE;
 759    texObj->ImmutableLevels = origTexObj->ImmutableLevels;
 760    texObj->Target = target;
 761    texObj->TargetIndex = _mesa_tex_target_to_index(ctx, target);
 762    assert(texObj->TargetIndex < NUM_TEXTURE_TARGETS);
 763
 764    if (ctx->Driver.TextureView != NULL &&
 765        !ctx->Driver.TextureView(ctx, texObj, origTexObj)) {
 766       return; /* driver recorded error */
 767    }
 768 }