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 static const struct internal_format_class_info gles_astc_3d_compatible_internal_formats[] = {
 234 #define ASTC_FMT(size) \
 235    {VIEW_CLASS_ASTC_##size##_RGBA, GL_COMPRESSED_RGBA_ASTC_##size##_OES}, \
 236    {VIEW_CLASS_ASTC_##size##_RGBA, GL_COMPRESSED_SRGB8_ALPHA8_ASTC_##size##_OES}
 237
 238    ASTC_FMT(3x3x3),
 239    ASTC_FMT(4x3x3),
 240    ASTC_FMT(4x4x3),
 241    ASTC_FMT(4x4x4),
 242    ASTC_FMT(5x4x4),
 243    ASTC_FMT(5x5x4),
 244    ASTC_FMT(5x5x5),
 245    ASTC_FMT(6x5x5),
 246    ASTC_FMT(6x6x5),
 247    ASTC_FMT(6x6x6),
 248 #undef ASTC_FMT
 249 };
 250
 251 GLenum
 252 _mesa_texture_view_lookup_view_class(const struct gl_context *ctx, GLenum internalformat)
 253 {
 254    GLuint i;
 255
 256    for (i = 0; i < ARRAY_SIZE(compatible_internal_formats); i++) {
 257       if (compatible_internal_formats[i].internal_format == internalformat)
 258          return compatible_internal_formats[i].view_class;
 259    }
 260
 261    if (ctx->Extensions.EXT_texture_compression_s3tc &&
 262        ctx->Extensions.EXT_texture_sRGB) {
 263       for (i = 0; i < ARRAY_SIZE(s3tc_compatible_internal_formats); i++) {
 264          if (s3tc_compatible_internal_formats[i].internal_format
 265              == internalformat)
 266             return s3tc_compatible_internal_formats[i].view_class;
 267       }
 268    }
 269
 270    if (_mesa_is_gles3(ctx)) {
 271       for (i = 0; i < ARRAY_SIZE(gles_etc2_compatible_internal_formats); i++) {
 272          if (gles_etc2_compatible_internal_formats[i].internal_format
 273              == internalformat)
 274             return gles_etc2_compatible_internal_formats[i].view_class;
 275       }
 276
 277       if (ctx->Extensions.KHR_texture_compression_astc_ldr) {
 278          for (i = 0; i < ARRAY_SIZE(gles_astc_compatible_internal_formats); i++) {
 279             if (gles_astc_compatible_internal_formats[i].internal_format
 280                 == internalformat)
 281                return gles_astc_compatible_internal_formats[i].view_class;
 282          }
 283       }
 284
 285       if (ctx->Extensions.OES_texture_compression_astc) {
 286          for (i = 0; i < ARRAY_SIZE(gles_astc_3d_compatible_internal_formats); i++) {
 287             if (gles_astc_3d_compatible_internal_formats[i].internal_format
 288                 == internalformat)
 289                return gles_astc_3d_compatible_internal_formats[i].view_class;
 290          }
 291       }
 292    }
 293    return GL_FALSE;
 294 }
 295
 296 /**
 297  * Initialize new texture's gl_texture_image structures. Will not call driver
 298  * to allocate new space, simply record relevant layer, face, format, etc.
 299  * \return GL_FALSE if any error, GL_TRUE otherwise.
 300  */
 301 static GLboolean
 302 initialize_texture_fields(struct gl_context *ctx,
 303                           GLenum target,
 304                           struct gl_texture_object *texObj,
 305                           GLint levels,
 306                           GLsizei width, GLsizei height, GLsizei depth,
 307                           GLenum internalFormat, mesa_format texFormat)
 308 {
 309    const GLuint numFaces = _mesa_num_tex_faces(target);
 310    GLint level, levelWidth = width, levelHeight = height, levelDepth = depth;
 311    GLuint face;
 312
 313    /* Pretend we are bound to initialize the gl_texture_image structs */
 314    texObj->Target = target;
 315
 316    /* Set up all the texture object's gl_texture_images */
 317    for (level = 0; level < levels; level++) {
 318       for (face = 0; face < numFaces; face++) {
 319          struct gl_texture_image *texImage;
 320          const GLenum faceTarget = _mesa_cube_face_target(target, face);
 321
 322          texImage = _mesa_get_tex_image(ctx, texObj, faceTarget, level);
 323
 324          if (!texImage) {
 325             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glTexStorage");
 326             return GL_FALSE;
 327          }
 328
 329          _mesa_init_teximage_fields(ctx, texImage,
 330                                     levelWidth, levelHeight, levelDepth,
 331                                     0, internalFormat, texFormat);
 332       }
 333
 334       _mesa_next_mipmap_level_size(target, 0,
 335                                    levelWidth, levelHeight, levelDepth,
 336                                    &levelWidth, &levelHeight, &levelDepth);
 337    }
 338
 339    /* "unbind" */
 340    texObj->Target = 0;
 341
 342    return GL_TRUE;
 343 }
 344
 345 #define RETURN_IF_SUPPORTED(t) do {             \
 346    if (newTarget == GL_ ## t)                   \
 347       return true;                              \
 348 } while (0)
 349
 350 /**
 351  * Check for compatible target
 352  * If an error is found, record it with _mesa_error()
 353  * \return false if any error, true otherwise.
 354  */
 355 static bool
 356 target_valid(struct gl_context *ctx, GLenum origTarget, GLenum newTarget)
 357 {
 358    /*
 359     * From ARB_texture_view spec:
 360    ---------------------------------------------------------------------------------------------------------
 361    | Original target              | Valid new targets |
 362    ---------------------------------------------------------------------------------------------------------
 363    | TEXTURE_1D                   | TEXTURE_1D, TEXTURE_1D_ARRAY |
 364    | ------------------------------------------------------------------------------------------------------- |
 365    | TEXTURE_2D                   | TEXTURE_2D, TEXTURE_2D_ARRAY |
 366    | ------------------------------------------------------------------------------------------------------- |
 367    | TEXTURE_3D                   | TEXTURE_3D |
 368    | ------------------------------------------------------------------------------------------------------- |
 369    | TEXTURE_CUBE_MAP             | TEXTURE_CUBE_MAP, TEXTURE_2D, TEXTURE_2D_ARRAY, TEXTURE_CUBE_MAP_ARRAY |
 370    | ------------------------------------------------------------------------------------------------------- |
 371    | TEXTURE_RECTANGLE            | TEXTURE_RECTANGLE |
 372    | ------------------------------------------------------------------------------------------------------- |
 373    | TEXTURE_BUFFER               | <none> |
 374    | ------------------------------------------------------------------------------------------------------- |
 375    | TEXTURE_1D_ARRAY             | TEXTURE_1D_ARRAY, TEXTURE_1D |
 376    | ------------------------------------------------------------------------------------------------------- |
 377    | TEXTURE_2D_ARRAY             | TEXTURE_2D_ARRAY, TEXTURE_2D, TEXTURE_CUBE_MAP, TEXTURE_CUBE_MAP_ARRAY |
 378    | ------------------------------------------------------------------------------------------------------- |
 379    | TEXTURE_CUBE_MAP_ARRAY       | TEXTURE_CUBE_MAP_ARRAY, TEXTURE_2D_ARRAY, TEXTURE_2D, TEXTURE_CUBE_MAP |
 380    | ------------------------------------------------------------------------------------------------------- |
 381    | TEXTURE_2D_MULTISAMPLE       | TEXTURE_2D_MULTISAMPLE, TEXTURE_2D_MULTISAMPLE_ARRAY |
 382    | ------------------------------------------------------------------------------------------------------- |
 383    | TEXTURE_2D_MULTISAMPLE_ARRAY | TEXTURE_2D_MULTISAMPLE, TEXTURE_2D_MULTISAMPLE_ARRAY |
 384    ---------------------------------------------------------------------------------------------------------
 385     */
 386
 387    switch (origTarget) {
 388    case GL_TEXTURE_1D:
 389    case GL_TEXTURE_1D_ARRAY:
 390       RETURN_IF_SUPPORTED(TEXTURE_1D);
 391       RETURN_IF_SUPPORTED(TEXTURE_1D_ARRAY);
 392       break;
 393    case GL_TEXTURE_2D:
 394       RETURN_IF_SUPPORTED(TEXTURE_2D);
 395       RETURN_IF_SUPPORTED(TEXTURE_2D_ARRAY);
 396       break;
 397    case GL_TEXTURE_3D:
 398       RETURN_IF_SUPPORTED(TEXTURE_3D);
 399       break;
 400    case GL_TEXTURE_RECTANGLE:
 401       RETURN_IF_SUPPORTED(TEXTURE_RECTANGLE);
 402       break;
 403    case GL_TEXTURE_CUBE_MAP:
 404    case GL_TEXTURE_2D_ARRAY:
 405    case GL_TEXTURE_CUBE_MAP_ARRAY:
 406       RETURN_IF_SUPPORTED(TEXTURE_2D);
 407       RETURN_IF_SUPPORTED(TEXTURE_2D_ARRAY);
 408       RETURN_IF_SUPPORTED(TEXTURE_CUBE_MAP);
 409       RETURN_IF_SUPPORTED(TEXTURE_CUBE_MAP_ARRAY);
 410       break;
 411    case GL_TEXTURE_2D_MULTISAMPLE:
 412    case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
 413       RETURN_IF_SUPPORTED(TEXTURE_2D_MULTISAMPLE);
 414       RETURN_IF_SUPPORTED(TEXTURE_2D_MULTISAMPLE_ARRAY);
 415       break;
 416    }
 417    _mesa_error(ctx, GL_INVALID_OPERATION,
 418                "glTextureView(illegal target=%s)",
 419                _mesa_enum_to_string(newTarget));
 420    return false;
 421 }
 422 #undef RETURN_IF_SUPPORTED
 423
 424 /**
 425  * Check for compatible format
 426  * If an error is found, record it with _mesa_error()
 427  * \return false if any error, true otherwise.
 428  */
 429 bool
 430 _mesa_texture_view_compatible_format(const struct gl_context *ctx,
 431                                      GLenum origInternalFormat,
 432                                      GLenum newInternalFormat)
 433 {
 434    unsigned int origViewClass, newViewClass;
 435
 436    /* The two textures' internal formats must be compatible according to
 437     * Table 3.X.2 (Compatible internal formats for TextureView)
 438     * if the internal format exists in that table the view class must match.
 439     * The internal formats must be identical if not in that table,
 440     * or an INVALID_OPERATION error is generated.
 441     */
 442    if (origInternalFormat == newInternalFormat)
 443       return true;
 444
 445    origViewClass = _mesa_texture_view_lookup_view_class(ctx, origInternalFormat);
 446    newViewClass = _mesa_texture_view_lookup_view_class(ctx, newInternalFormat);
 447    if ((origViewClass == newViewClass) && origViewClass != false)
 448       return true;
 449
 450    return false;
 451 }
 452
 453 /**
 454  * Helper function for TexStorage and teximagemultisample to set immutable
 455  * texture state needed by ARB_texture_view.
 456  */
 457 void
 458 _mesa_set_texture_view_state(struct gl_context *ctx,
 459                              struct gl_texture_object *texObj,
 460                              GLenum target, GLuint levels)
 461 {
 462    struct gl_texture_image *texImage;
 463
 464    /* Get a reference to what will become this View's base level */
 465    texImage = _mesa_select_tex_image(texObj, target, 0);
 466
 467    /* When an immutable texture is created via glTexStorage or
 468     * glTexImageMultisample,
 469     * TEXTURE_IMMUTABLE_FORMAT becomes TRUE.
 470     * TEXTURE_IMMUTABLE_LEVELS and TEXTURE_VIEW_NUM_LEVELS become levels.
 471     * If the texture target is TEXTURE_1D_ARRAY then
 472     * TEXTURE_VIEW_NUM_LAYERS becomes height.
 473     * If the texture target is TEXTURE_2D_ARRAY, TEXTURE_CUBE_MAP_ARRAY,
 474     * or TEXTURE_2D_MULTISAMPLE_ARRAY then TEXTURE_VIEW_NUM_LAYERS becomes
 475     * depth.
 476     * If the texture target is TEXTURE_CUBE_MAP, then
 477     * TEXTURE_VIEW_NUM_LAYERS becomes 6.
 478     * For any other texture target, TEXTURE_VIEW_NUM_LAYERS becomes 1.
 479     *
 480     * ARB_texture_multisample: Multisample textures do
 481     * not have multiple image levels.
 482     */
 483
 484    texObj->Immutable = GL_TRUE;
 485    texObj->ImmutableLevels = levels;
 486    texObj->MinLevel = 0;
 487    texObj->NumLevels = levels;
 488    texObj->MinLayer = 0;
 489    texObj->NumLayers = 1;
 490    switch (target) {
 491    case GL_TEXTURE_1D_ARRAY:
 492       texObj->NumLayers = texImage->Height;
 493       break;
 494
 495    case GL_TEXTURE_2D_MULTISAMPLE:
 496       texObj->NumLevels = 1;
 497       texObj->ImmutableLevels = 1;
 498       break;
 499
 500    case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
 501       texObj->NumLevels = 1;
 502       texObj->ImmutableLevels = 1;
 503       /* fall through to set NumLayers */
 504
 505    case GL_TEXTURE_2D_ARRAY:
 506    case GL_TEXTURE_CUBE_MAP_ARRAY:
 507       texObj->NumLayers = texImage->Depth;
 508       break;
 509
 510    case GL_TEXTURE_CUBE_MAP:
 511       texObj->NumLayers = 6;
 512       break;
 513    }
 514 }
 515
 516 /**
 517  * glTextureView (ARB_texture_view)
 518  * If an error is found, record it with _mesa_error()
 519  * \return none.
 520  */
 521 void GLAPIENTRY
 522 _mesa_TextureView(GLuint texture, GLenum target, GLuint origtexture,
 523                   GLenum internalformat,
 524                   GLuint minlevel, GLuint numlevels,
 525                   GLuint minlayer, GLuint numlayers)
 526 {
 527    struct gl_texture_object *texObj;
 528    struct gl_texture_object *origTexObj;
 529    struct gl_texture_image *origTexImage;
 530    GLuint newViewMinLevel, newViewMinLayer;
 531    GLuint newViewNumLevels, newViewNumLayers;
 532    GLsizei width, height, depth;
 533    mesa_format texFormat;
 534    GLboolean sizeOK, dimensionsOK;
 535    GLenum faceTarget;
 536
 537    GET_CURRENT_CONTEXT(ctx);
 538
 539    if (MESA_VERBOSE & (VERBOSE_API | VERBOSE_TEXTURE))
 540       _mesa_debug(ctx, "glTextureView %d %s %d %s %d %d %d %d\n",
 541                   texture, _mesa_enum_to_string(target), origtexture,
 542                   _mesa_enum_to_string(internalformat),
 543                   minlevel, numlevels, minlayer, numlayers);
 544
 545    if (origtexture == 0) {
 546       _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(origtexture = %u)",
 547                   origtexture);
 548       return;
 549    }
 550
 551    /* Need original texture information to validate arguments */
 552    origTexObj = _mesa_lookup_texture(ctx, origtexture);
 553
 554    /* If <origtexture> is not the name of a texture, INVALID_VALUE
 555     * is generated.
 556     */
 557    if (!origTexObj) {
 558       _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(origtexture = %u)",
 559                   origtexture);
 560       return;
 561    }
 562
 563    /* If <origtexture>'s TEXTURE_IMMUTABLE_FORMAT value is not TRUE,
 564     * INVALID_OPERATION is generated.
 565     */
 566    if (!origTexObj->Immutable) {
 567       _mesa_error(ctx, GL_INVALID_OPERATION,
 568                   "glTextureView(origtexture not immutable)");
 569       return;
 570    }
 571
 572    /* If <texture> is 0, INVALID_VALUE is generated. */
 573    if (texture == 0) {
 574       _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(texture = 0)");
 575       return;
 576    }
 577
 578    /* If <texture> is not a valid name returned by GenTextures,
 579     * the error INVALID_OPERATION is generated.
 580     */
 581    texObj = _mesa_lookup_texture(ctx, texture);
 582    if (texObj == NULL) {
 583       _mesa_error(ctx, GL_INVALID_OPERATION,
 584                   "glTextureView(texture = %u non-gen name)", texture);
 585       return;
 586    }
 587
 588    /* If <texture> has already been bound and given a target, then
 589     * the error INVALID_OPERATION is generated.
 590     */
 591    if (texObj->Target) {
 592       _mesa_error(ctx, GL_INVALID_OPERATION,
 593                   "glTextureView(texture = %u already bound)", texture);
 594       return;
 595    }
 596
 597    /* Check for compatible target */
 598    if (!target_valid(ctx, origTexObj->Target, target)) {
 599       return; /* error was recorded */
 600    }
 601
 602    /* minlevel and minlayer are relative to the view of origtexture.
 603     * If minlevel or minlayer is greater than level or layer, respectively,
 604     * return INVALID_VALUE.
 605     */
 606    newViewMinLevel = origTexObj->MinLevel + minlevel;
 607    newViewMinLayer = origTexObj->MinLayer + minlayer;
 608    if (newViewMinLevel >= (origTexObj->MinLevel + origTexObj->NumLevels)) {
 609       _mesa_error(ctx, GL_INVALID_VALUE,
 610                   "glTextureView(new minlevel (%d) > orig minlevel (%d)"
 611                   " + orig numlevels (%d))",
 612                   newViewMinLevel, origTexObj->MinLevel, origTexObj->NumLevels);
 613       return;
 614    }
 615
 616    if (newViewMinLayer >= (origTexObj->MinLayer + origTexObj->NumLayers)) {
 617       _mesa_error(ctx, GL_INVALID_VALUE,
 618                   "glTextureView(new minlayer (%d) > orig minlayer (%d)"
 619                   " + orig numlayers (%d))",
 620                   newViewMinLayer, origTexObj->MinLayer, origTexObj->NumLayers);
 621       return;
 622    }
 623
 624    if (!_mesa_texture_view_compatible_format(ctx,
 625                                    origTexObj->Image[0][0]->InternalFormat,
 626                                    internalformat)) {
 627       _mesa_error(ctx, GL_INVALID_OPERATION,
 628           "glTextureView(internalformat %s not compatible with origtexture %s)",
 629           _mesa_enum_to_string(internalformat),
 630           _mesa_enum_to_string(origTexObj->Image[0][0]->InternalFormat));
 631       return;
 632    }
 633
 634    texFormat = _mesa_choose_texture_format(ctx, texObj, target, 0,
 635                                            internalformat, GL_NONE, GL_NONE);
 636    if (texFormat == MESA_FORMAT_NONE) return;
 637
 638    newViewNumLevels = MIN2(numlevels, origTexObj->NumLevels - minlevel);
 639    newViewNumLayers = MIN2(numlayers, origTexObj->NumLayers - minlayer);
 640
 641    faceTarget = _mesa_cube_face_target(origTexObj->Target, minlayer);
 642
 643    /* Get a reference to what will become this View's base level */
 644    origTexImage = _mesa_select_tex_image(origTexObj, faceTarget, minlevel);
 645    width = origTexImage->Width;
 646    height = origTexImage->Height;
 647    depth = origTexImage->Depth;
 648
 649    /* Adjust width, height, depth to be appropriate for new target */
 650    switch (target) {
 651    case GL_TEXTURE_1D:
 652       height = 1;
 653       break;
 654
 655    case GL_TEXTURE_3D:
 656       break;
 657
 658    case GL_TEXTURE_1D_ARRAY:
 659       height = (GLsizei) newViewNumLayers;
 660       break;
 661
 662    case GL_TEXTURE_2D:
 663    case GL_TEXTURE_2D_MULTISAMPLE:
 664    case GL_TEXTURE_RECTANGLE:
 665       depth = 1;
 666       break;
 667    case GL_TEXTURE_CUBE_MAP:
 668       /* If the new texture's target is TEXTURE_CUBE_MAP, the clamped
 669        * <numlayers> must be equal to 6.
 670        */
 671       if (newViewNumLayers != 6) {
 672          _mesa_error(ctx, GL_INVALID_VALUE,
 673                      "glTextureView(clamped numlayers %d != 6)",
 674                      newViewNumLayers);
 675          return;
 676       }
 677       depth = 1;
 678       break;
 679
 680    case GL_TEXTURE_2D_ARRAY:
 681    case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
 682       depth = newViewNumLayers;
 683       break;
 684    case GL_TEXTURE_CUBE_MAP_ARRAY:
 685       /* If the new texture's target is TEXTURE_CUBE_MAP_ARRAY,
 686        * then <numlayers> counts layer-faces rather than layers,
 687        * and the clamped <numlayers> must be a multiple of 6.
 688        * Otherwise, the error INVALID_VALUE is generated.
 689        */
 690       if ((newViewNumLayers % 6) != 0) {
 691          _mesa_error(ctx, GL_INVALID_VALUE,
 692                      "glTextureView(clamped numlayers %d is not"
 693                      " a multiple of 6)",
 694                      newViewNumLayers);
 695          return;
 696       }
 697       depth = newViewNumLayers;
 698       break;
 699    }
 700
 701    /* If the dimensions of the original texture are larger than the maximum
 702     * supported dimensions of the new target, the error INVALID_OPERATION is
 703     * generated. For example, if the original texture has a TEXTURE_2D_ARRAY
 704     * target and its width is greater than MAX_CUBE_MAP_TEXTURE_SIZE, an error
 705     * will be generated if TextureView is called to create a TEXTURE_CUBE_MAP
 706     * view.
 707     */
 708    dimensionsOK = _mesa_legal_texture_dimensions(ctx, target, 0,
 709                                                  width, height, depth, 0);
 710    if (!dimensionsOK) {
 711       _mesa_error(ctx, GL_INVALID_OPERATION,
 712                   "glTextureView(invalid width or height or depth)");
 713       return;
 714    }
 715
 716    sizeOK = ctx->Driver.TestProxyTexImage(ctx, target, 1, 0, texFormat,
 717                                           origTexImage->NumSamples,
 718                                           width, height, depth);
 719    if (!sizeOK) {
 720       _mesa_error(ctx, GL_INVALID_OPERATION,
 721                   "glTextureView(invalid texture size)");
 722       return;
 723    }
 724
 725    /* If <target> is TEXTURE_1D, TEXTURE_2D, TEXTURE_3D, TEXTURE_RECTANGLE,
 726     * or TEXTURE_2D_MULTISAMPLE and <numlayers> does not equal 1, the error
 727     * INVALID_VALUE is generated.
 728     */
 729    switch (target) {
 730    case GL_TEXTURE_1D:
 731    case GL_TEXTURE_2D:
 732    case GL_TEXTURE_3D:
 733    case GL_TEXTURE_RECTANGLE:
 734    case GL_TEXTURE_2D_MULTISAMPLE:
 735       if (numlayers != 1) {
 736          _mesa_error(ctx, GL_INVALID_VALUE, "glTextureView(numlayers %d != 1)",
 737                      numlayers);
 738          return;
 739       }
 740       break;
 741    case GL_TEXTURE_CUBE_MAP:
 742       break;
 743    case GL_TEXTURE_CUBE_MAP_ARRAY:
 744       break;
 745    }
 746
 747    /* If the new texture's target is TEXTURE_CUBE_MAP or
 748     * TEXTURE_CUBE_MAP_ARRAY, the width and height of the original texture's
 749     * levels must be equal otherwise the error INVALID_OPERATION is generated.
 750     */
 751    if ((target == GL_TEXTURE_CUBE_MAP || target == GL_TEXTURE_CUBE_MAP_ARRAY) &&
 752        (origTexImage->Width != origTexImage->Height)) {
 753       _mesa_error(ctx, GL_INVALID_OPERATION,
 754                   "glTextureView(origtexture width (%d) != height (%d))",
 755                   origTexImage->Width, origTexImage->Height);
 756       return;
 757    }
 758
 759    /* When the original texture's target is TEXTURE_CUBE_MAP, the layer
 760     * parameters are interpreted in the same order as if it were a
 761     * TEXTURE_CUBE_MAP_ARRAY with 6 layer-faces.
 762     */
 763
 764    /* If the internal format does not exactly match the internal format of the
 765     * original texture, the contents of the memory are reinterpreted in the
 766     * same manner as for image bindings described in
 767     * section 3.9.20 (Texture Image Loads and Stores).
 768     */
 769
 770    /* TEXTURE_BASE_LEVEL and TEXTURE_MAX_LEVEL are interpreted
 771     * relative to the view and not relative to the original data store.
 772     */
 773
 774    if (!initialize_texture_fields(ctx, target, texObj, newViewNumLevels,
 775                                   width, height, depth,
 776                                   internalformat, texFormat)) {
 777       return; /* Already recorded error */
 778    }
 779
 780    texObj->MinLevel = newViewMinLevel;
 781    texObj->MinLayer = newViewMinLayer;
 782    texObj->NumLevels = newViewNumLevels;
 783    texObj->NumLayers = newViewNumLayers;
 784    texObj->Immutable = GL_TRUE;
 785    texObj->ImmutableLevels = origTexObj->ImmutableLevels;
 786    texObj->Target = target;
 787    texObj->TargetIndex = _mesa_tex_target_to_index(ctx, target);
 788    assert(texObj->TargetIndex < NUM_TEXTURE_TARGETS);
 789
 790    if (ctx->Driver.TextureView != NULL &&
 791        !ctx->Driver.TextureView(ctx, texObj, origTexObj)) {
 792       return; /* driver recorded error */
 793    }
 794 }