src/glsl/glsl_types.h

   1 /* -*- c++ -*- */
   2 /*
   3  * Copyright © 2009 Intel Corporation
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * 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
  25 #pragma once
  26 #ifndef GLSL_TYPES_H
  27 #define GLSL_TYPES_H
  28
  29 #include <string.h>
  30 #include <assert.h>
  31
  32 #ifdef __cplusplus
  33 extern "C" {
  34 #endif
  35
  36 struct _mesa_glsl_parse_state;
  37 struct glsl_symbol_table;
  38
  39 extern void
  40 _mesa_glsl_initialize_types(struct _mesa_glsl_parse_state *state);
  41
  42 extern void
  43 _mesa_glsl_release_types(void);
  44
  45 #ifdef __cplusplus
  46 }
  47 #endif
  48
  49 enum glsl_base_type {
  50    GLSL_TYPE_UINT = 0,
  51    GLSL_TYPE_INT,
  52    GLSL_TYPE_FLOAT,
  53    GLSL_TYPE_DOUBLE,
  54    GLSL_TYPE_BOOL,
  55    GLSL_TYPE_SAMPLER,
  56    GLSL_TYPE_IMAGE,
  57    GLSL_TYPE_ATOMIC_UINT,
  58    GLSL_TYPE_STRUCT,
  59    GLSL_TYPE_FUNCTION,
  60    GLSL_TYPE_INTERFACE,
  61    GLSL_TYPE_ARRAY,
  62    GLSL_TYPE_VOID,
  63    GLSL_TYPE_SUBROUTINE,
  64    GLSL_TYPE_ERROR
  65 };
  66
  67 enum glsl_sampler_dim {
  68    GLSL_SAMPLER_DIM_1D = 0,
  69    GLSL_SAMPLER_DIM_2D,
  70    GLSL_SAMPLER_DIM_3D,
  71    GLSL_SAMPLER_DIM_CUBE,
  72    GLSL_SAMPLER_DIM_RECT,
  73    GLSL_SAMPLER_DIM_BUF,
  74    GLSL_SAMPLER_DIM_EXTERNAL,
  75    GLSL_SAMPLER_DIM_MS
  76 };
  77
  78 enum glsl_interface_packing {
  79    GLSL_INTERFACE_PACKING_STD140,
  80    GLSL_INTERFACE_PACKING_SHARED,
  81    GLSL_INTERFACE_PACKING_PACKED
  82 };
  83
  84 enum glsl_matrix_layout {
  85    /**
  86     * The layout of the matrix is inherited from the object containing the
  87     * matrix (the top level structure or the uniform block).
  88     */
  89    GLSL_MATRIX_LAYOUT_INHERITED,
  90
  91    /**
  92     * Explicit column-major layout
  93     *
  94     * If a uniform block doesn't have an explicit layout set, it will default
  95     * to this layout.
  96     */
  97    GLSL_MATRIX_LAYOUT_COLUMN_MAJOR,
  98
  99    /**
 100     * Row-major layout
 101     */
 102    GLSL_MATRIX_LAYOUT_ROW_MAJOR
 103 };
 104
 105 #ifdef __cplusplus
 106 #include "GL/gl.h"
 107 #include "util/ralloc.h"
 108 #include "main/mtypes.h" /* for gl_texture_index, C++'s enum rules are broken */
 109
 110 struct glsl_type {
 111    GLenum gl_type;
 112    glsl_base_type base_type;
 113
 114    unsigned sampler_dimensionality:3; /**< \see glsl_sampler_dim */
 115    unsigned sampler_shadow:1;
 116    unsigned sampler_array:1;
 117    unsigned sampler_type:2;    /**< Type of data returned using this
 118                                 * sampler or image.  Only \c
 119                                 * GLSL_TYPE_FLOAT, \c GLSL_TYPE_INT,
 120                                 * and \c GLSL_TYPE_UINT are valid.
 121                                 */
 122    unsigned interface_packing:2;
 123
 124    /* Callers of this ralloc-based new need not call delete. It's
 125     * easier to just ralloc_free 'mem_ctx' (or any of its ancestors). */
 126    static void* operator new(size_t size)
 127    {
 128       mtx_lock(&glsl_type::mutex);
 129
 130       /* mem_ctx should have been created by the static members */
 131       assert(glsl_type::mem_ctx != NULL);
 132
 133       void *type;
 134
 135       type = ralloc_size(glsl_type::mem_ctx, size);
 136       assert(type != NULL);
 137
 138       mtx_unlock(&glsl_type::mutex);
 139
 140       return type;
 141    }
 142
 143    /* If the user *does* call delete, that's OK, we will just
 144     * ralloc_free in that case. */
 145    static void operator delete(void *type)
 146    {
 147       mtx_lock(&glsl_type::mutex);
 148       ralloc_free(type);
 149       mtx_unlock(&glsl_type::mutex);
 150    }
 151
 152    /**
 153     * \name Vector and matrix element counts
 154     *
 155     * For scalars, each of these values will be 1.  For non-numeric types
 156     * these will be 0.
 157     */
 158    /*@{*/
 159    uint8_t vector_elements;    /**< 1, 2, 3, or 4 vector elements. */
 160    uint8_t matrix_columns;     /**< 1, 2, 3, or 4 matrix columns. */
 161    /*@}*/
 162
 163    /**
 164     * For \c GLSL_TYPE_ARRAY, this is the length of the array.  For
 165     * \c GLSL_TYPE_STRUCT or \c GLSL_TYPE_INTERFACE, it is the number of
 166     * elements in the structure and the number of values pointed to by
 167     * \c fields.structure (below).
 168     */
 169    unsigned length;
 170
 171    /**
 172     * Name of the data type
 173     *
 174     * Will never be \c NULL.
 175     */
 176    const char *name;
 177
 178    /**
 179     * Subtype of composite data types.
 180     */
 181    union {
 182       const struct glsl_type *array;            /**< Type of array elements. */
 183       struct glsl_function_param *parameters;   /**< Parameters to function. */
 184       struct glsl_struct_field *structure;      /**< List of struct fields. */
 185    } fields;
 186
 187    /**
 188     * \name Pointers to various public type singletons
 189     */
 190    /*@{*/
 191 #undef  DECL_TYPE
 192 #define DECL_TYPE(NAME, ...) \
 193    static const glsl_type *const NAME##_type;
 194 #undef  STRUCT_TYPE
 195 #define STRUCT_TYPE(NAME) \
 196    static const glsl_type *const struct_##NAME##_type;
 197 #include "builtin_type_macros.h"
 198    /*@}*/
 199
 200    /**
 201     * Convenience accessors for vector types (shorter than get_instance()).
 202     * @{
 203     */
 204    static const glsl_type *vec(unsigned components);
 205    static const glsl_type *dvec(unsigned components);
 206    static const glsl_type *ivec(unsigned components);
 207    static const glsl_type *uvec(unsigned components);
 208    static const glsl_type *bvec(unsigned components);
 209    /**@}*/
 210
 211    /**
 212     * For numeric and boolean derived types returns the basic scalar type
 213     *
 214     * If the type is a numeric or boolean scalar, vector, or matrix type,
 215     * this function gets the scalar type of the individual components.  For
 216     * all other types, including arrays of numeric or boolean types, the
 217     * error type is returned.
 218     */
 219    const glsl_type *get_base_type() const;
 220
 221    /**
 222     * Get the basic scalar type which this type aggregates.
 223     *
 224     * If the type is a numeric or boolean scalar, vector, or matrix, or an
 225     * array of any of those, this function gets the scalar type of the
 226     * individual components.  For structs and arrays of structs, this function
 227     * returns the struct type.  For samplers and arrays of samplers, this
 228     * function returns the sampler type.
 229     */
 230    const glsl_type *get_scalar_type() const;
 231
 232    /**
 233     * Get the instance of a built-in scalar, vector, or matrix type
 234     */
 235    static const glsl_type *get_instance(unsigned base_type, unsigned rows,
 236                                         unsigned columns);
 237
 238    /**
 239     * Get the instance of a sampler type
 240     */
 241    static const glsl_type *get_sampler_instance(enum glsl_sampler_dim dim,
 242                                                 bool shadow,
 243                                                 bool array,
 244                                                 glsl_base_type type);
 245
 246
 247    /**
 248     * Get the instance of an array type
 249     */
 250    static const glsl_type *get_array_instance(const glsl_type *base,
 251                                               unsigned elements);
 252
 253    /**
 254     * Get the instance of a record type
 255     */
 256    static const glsl_type *get_record_instance(const glsl_struct_field *fields,
 257                                                unsigned num_fields,
 258                                                const char *name);
 259
 260    /**
 261     * Get the instance of an interface block type
 262     */
 263    static const glsl_type *get_interface_instance(const glsl_struct_field *fields,
 264                                                   unsigned num_fields,
 265                                                   enum glsl_interface_packing packing,
 266                                                   const char *block_name);
 267
 268    /**
 269     * Get the instance of a function type
 270     */
 271    static const glsl_type *get_function_instance(const struct glsl_type *return_type,
 272                                                  const glsl_function_param *parameters,
 273                                                  unsigned num_params);
 274    /**
 275     * Get the instance of an subroutine type
 276     */
 277    static const glsl_type *get_subroutine_instance(const char *subroutine_name);
 278
 279    /**
 280     * Get the type resulting from a multiplication of \p type_a * \p type_b
 281     */
 282    static const glsl_type *get_mul_type(const glsl_type *type_a,
 283                                         const glsl_type *type_b);
 284
 285    /**
 286     * Query the total number of scalars that make up a scalar, vector or matrix
 287     */
 288    unsigned components() const
 289    {
 290       return vector_elements * matrix_columns;
 291    }
 292
 293    /**
 294     * Calculate the number of components slots required to hold this type
 295     *
 296     * This is used to determine how many uniform or varying locations a type
 297     * might occupy.
 298     */
 299    unsigned component_slots() const;
 300
 301    /**
 302     * Calculate the number of unique values from glGetUniformLocation for the
 303     * elements of the type.
 304     *
 305     * This is used to allocate slots in the UniformRemapTable, the amount of
 306     * locations may not match with actual used storage space by the driver.
 307     */
 308    unsigned uniform_locations() const;
 309
 310    /**
 311     * Calculate the number of attribute slots required to hold this type
 312     *
 313     * This implements the language rules of GLSL 1.50 for counting the number
 314     * of slots used by a vertex attribute.  It also determines the number of
 315     * varying slots the type will use up in the absence of varying packing
 316     * (and thus, it can be used to measure the number of varying slots used by
 317     * the varyings that are generated by lower_packed_varyings).
 318     */
 319    unsigned count_attribute_slots() const;
 320
 321
 322    /**
 323     * Alignment in bytes of the start of this type in a std140 uniform
 324     * block.
 325     */
 326    unsigned std140_base_alignment(bool row_major) const;
 327
 328    /** Size in bytes of this type in a std140 uniform block.
 329     *
 330     * Note that this is not GL_UNIFORM_SIZE (which is the number of
 331     * elements in the array)
 332     */
 333    unsigned std140_size(bool row_major) const;
 334
 335    /**
 336     * \brief Can this type be implicitly converted to another?
 337     *
 338     * \return True if the types are identical or if this type can be converted
 339     *         to \c desired according to Section 4.1.10 of the GLSL spec.
 340     *
 341     * \verbatim
 342     * From page 25 (31 of the pdf) of the GLSL 1.50 spec, Section 4.1.10
 343     * Implicit Conversions:
 344     *
 345     *     In some situations, an expression and its type will be implicitly
 346     *     converted to a different type. The following table shows all allowed
 347     *     implicit conversions:
 348     *
 349     *     Type of expression | Can be implicitly converted to
 350     *     --------------------------------------------------
 351     *     int                  float
 352     *     uint
 353     *
 354     *     ivec2                vec2
 355     *     uvec2
 356     *
 357     *     ivec3                vec3
 358     *     uvec3
 359     *
 360     *     ivec4                vec4
 361     *     uvec4
 362     *
 363     *     There are no implicit array or structure conversions. For example,
 364     *     an array of int cannot be implicitly converted to an array of float.
 365     *     There are no implicit conversions between signed and unsigned
 366     *     integers.
 367     * \endverbatim
 368     */
 369    bool can_implicitly_convert_to(const glsl_type *desired,
 370                                   _mesa_glsl_parse_state *state) const;
 371
 372    /**
 373     * Query whether or not a type is a scalar (non-vector and non-matrix).
 374     */
 375    bool is_scalar() const
 376    {
 377       return (vector_elements == 1)
 378          && (base_type >= GLSL_TYPE_UINT)
 379          && (base_type <= GLSL_TYPE_BOOL);
 380    }
 381
 382    /**
 383     * Query whether or not a type is a vector
 384     */
 385    bool is_vector() const
 386    {
 387       return (vector_elements > 1)
 388          && (matrix_columns == 1)
 389          && (base_type >= GLSL_TYPE_UINT)
 390          && (base_type <= GLSL_TYPE_BOOL);
 391    }
 392
 393    /**
 394     * Query whether or not a type is a matrix
 395     */
 396    bool is_matrix() const
 397    {
 398       /* GLSL only has float matrices. */
 399       return (matrix_columns > 1) && (base_type == GLSL_TYPE_FLOAT || base_type == GLSL_TYPE_DOUBLE);
 400    }
 401
 402    /**
 403     * Query whether or not a type is a non-array numeric type
 404     */
 405    bool is_numeric() const
 406    {
 407       return (base_type >= GLSL_TYPE_UINT) && (base_type <= GLSL_TYPE_DOUBLE);
 408    }
 409
 410    /**
 411     * Query whether or not a type is an integral type
 412     */
 413    bool is_integer() const
 414    {
 415       return (base_type == GLSL_TYPE_UINT) || (base_type == GLSL_TYPE_INT);
 416    }
 417
 418    /**
 419     * Query whether or not type is an integral type, or for struct and array
 420     * types, contains an integral type.
 421     */
 422    bool contains_integer() const;
 423
 424    /**
 425     * Query whether or not type is a double type, or for struct and array
 426     * types, contains a double type.
 427     */
 428    bool contains_double() const;
 429
 430    /**
 431     * Query whether or not a type is a float type
 432     */
 433    bool is_float() const
 434    {
 435       return base_type == GLSL_TYPE_FLOAT;
 436    }
 437
 438    /**
 439     * Query whether or not a type is a double type
 440     */
 441    bool is_double() const
 442    {
 443       return base_type == GLSL_TYPE_DOUBLE;
 444    }
 445
 446    /**
 447     * Query whether or not a type is a non-array boolean type
 448     */
 449    bool is_boolean() const
 450    {
 451       return base_type == GLSL_TYPE_BOOL;
 452    }
 453
 454    /**
 455     * Query whether or not a type is a sampler
 456     */
 457    bool is_sampler() const
 458    {
 459       return base_type == GLSL_TYPE_SAMPLER;
 460    }
 461
 462    /**
 463     * Query whether or not type is a sampler, or for struct and array
 464     * types, contains a sampler.
 465     */
 466    bool contains_sampler() const;
 467
 468    /**
 469     * Get the Mesa texture target index for a sampler type.
 470     */
 471    gl_texture_index sampler_index() const;
 472
 473    /**
 474     * Query whether or not type is an image, or for struct and array
 475     * types, contains an image.
 476     */
 477    bool contains_image() const;
 478
 479    /**
 480     * Query whether or not a type is an image
 481     */
 482    bool is_image() const
 483    {
 484       return base_type == GLSL_TYPE_IMAGE;
 485    }
 486
 487    /**
 488     * Query whether or not a type is an array
 489     */
 490    bool is_array() const
 491    {
 492       return base_type == GLSL_TYPE_ARRAY;
 493    }
 494
 495    /**
 496     * Query whether or not a type is a record
 497     */
 498    bool is_record() const
 499    {
 500       return base_type == GLSL_TYPE_STRUCT;
 501    }
 502
 503    /**
 504     * Query whether or not a type is an interface
 505     */
 506    bool is_interface() const
 507    {
 508       return base_type == GLSL_TYPE_INTERFACE;
 509    }
 510
 511    /**
 512     * Query whether or not a type is the void type singleton.
 513     */
 514    bool is_void() const
 515    {
 516       return base_type == GLSL_TYPE_VOID;
 517    }
 518
 519    /**
 520     * Query whether or not a type is the error type singleton.
 521     */
 522    bool is_error() const
 523    {
 524       return base_type == GLSL_TYPE_ERROR;
 525    }
 526
 527    /**
 528     * Query if a type is unnamed/anonymous (named by the parser)
 529     */
 530
 531    bool is_subroutine() const
 532    {
 533       return base_type == GLSL_TYPE_SUBROUTINE;
 534    }
 535    bool contains_subroutine() const;
 536
 537    bool is_anonymous() const
 538    {
 539       return !strncmp(name, "#anon", 5);
 540    }
 541
 542    /**
 543     * Get the type stripped of any arrays
 544     *
 545     * \return
 546     * Pointer to the type of elements of the first non-array type for array
 547     * types, or pointer to itself for non-array types.
 548     */
 549    const glsl_type *without_array() const
 550    {
 551       const glsl_type *t = this;
 552
 553       while (t->is_array())
 554          t = t->fields.array;
 555
 556       return t;
 557    }
 558
 559    /**
 560     * Return the amount of atomic counter storage required for a type.
 561     */
 562    unsigned atomic_size() const
 563    {
 564       if (base_type == GLSL_TYPE_ATOMIC_UINT)
 565          return ATOMIC_COUNTER_SIZE;
 566       else if (is_array())
 567          return length * fields.array->atomic_size();
 568       else
 569          return 0;
 570    }
 571
 572    /**
 573     * Return whether a type contains any atomic counters.
 574     */
 575    bool contains_atomic() const
 576    {
 577       return atomic_size() > 0;
 578    }
 579
 580    /**
 581     * Return whether a type contains any opaque types.
 582     */
 583    bool contains_opaque() const;
 584
 585    /**
 586     * Query the full type of a matrix row
 587     *
 588     * \return
 589     * If the type is not a matrix, \c glsl_type::error_type is returned.
 590     * Otherwise a type matching the rows of the matrix is returned.
 591     */
 592    const glsl_type *row_type() const
 593    {
 594       return is_matrix()
 595          ? get_instance(base_type, matrix_columns, 1)
 596          : error_type;
 597    }
 598
 599    /**
 600     * Query the full type of a matrix column
 601     *
 602     * \return
 603     * If the type is not a matrix, \c glsl_type::error_type is returned.
 604     * Otherwise a type matching the columns of the matrix is returned.
 605     */
 606    const glsl_type *column_type() const
 607    {
 608       return is_matrix()
 609          ? get_instance(base_type, vector_elements, 1)
 610          : error_type;
 611    }
 612
 613    /**
 614     * Get the type of a structure field
 615     *
 616     * \return
 617     * Pointer to the type of the named field.  If the type is not a structure
 618     * or the named field does not exist, \c glsl_type::error_type is returned.
 619     */
 620    const glsl_type *field_type(const char *name) const;
 621
 622    /**
 623     * Get the location of a filed within a record type
 624     */
 625    int field_index(const char *name) const;
 626
 627    /**
 628     * Query the number of elements in an array type
 629     *
 630     * \return
 631     * The number of elements in the array for array types or -1 for non-array
 632     * types.  If the number of elements in the array has not yet been declared,
 633     * zero is returned.
 634     */
 635    int array_size() const
 636    {
 637       return is_array() ? length : -1;
 638    }
 639
 640    /**
 641     * Query whether the array size for all dimensions has been declared.
 642     */
 643    bool is_unsized_array() const
 644    {
 645       return is_array() && length == 0;
 646    }
 647
 648    /**
 649     * Return the number of coordinate components needed for this
 650     * sampler or image type.
 651     *
 652     * This is based purely on the sampler's dimensionality.  For example, this
 653     * returns 1 for sampler1D, and 3 for sampler2DArray.
 654     *
 655     * Note that this is often different than actual coordinate type used in
 656     * a texturing built-in function, since those pack additional values (such
 657     * as the shadow comparitor or projector) into the coordinate type.
 658     */
 659    int coordinate_components() const;
 660
 661    /**
 662     * Compare a record type against another record type.
 663     *
 664     * This is useful for matching record types declared across shader stages.
 665     */
 666    bool record_compare(const glsl_type *b) const;
 667
 668 private:
 669
 670    static mtx_t mutex;
 671
 672    /**
 673     * ralloc context for all glsl_type allocations
 674     *
 675     * Set on the first call to \c glsl_type::new.
 676     */
 677    static void *mem_ctx;
 678
 679    void init_ralloc_type_ctx(void);
 680
 681    /** Constructor for vector and matrix types */
 682    glsl_type(GLenum gl_type,
 683              glsl_base_type base_type, unsigned vector_elements,
 684              unsigned matrix_columns, const char *name);
 685
 686    /** Constructor for sampler or image types */
 687    glsl_type(GLenum gl_type, glsl_base_type base_type,
 688              enum glsl_sampler_dim dim, bool shadow, bool array,
 689              unsigned type, const char *name);
 690
 691    /** Constructor for record types */
 692    glsl_type(const glsl_struct_field *fields, unsigned num_fields,
 693              const char *name);
 694
 695    /** Constructor for interface types */
 696    glsl_type(const glsl_struct_field *fields, unsigned num_fields,
 697              enum glsl_interface_packing packing, const char *name);
 698
 699    /** Constructor for interface types */
 700    glsl_type(const glsl_type *return_type,
 701              const glsl_function_param *params, unsigned num_params);
 702
 703    /** Constructor for array types */
 704    glsl_type(const glsl_type *array, unsigned length);
 705
 706    /** Constructor for subroutine types */
 707    glsl_type(const char *name);
 708
 709    /** Hash table containing the known array types. */
 710    static struct hash_table *array_types;
 711
 712    /** Hash table containing the known record types. */
 713    static struct hash_table *record_types;
 714
 715    /** Hash table containing the known interface types. */
 716    static struct hash_table *interface_types;
 717
 718    /** Hash table containing the known function types. */
 719    static struct hash_table *function_types;
 720
 721    /** Hash table containing the known subroutine types. */
 722    static struct hash_table *subroutine_types;
 723
 724    static bool record_key_compare(const void *a, const void *b);
 725    static unsigned record_key_hash(const void *key);
 726
 727    /**
 728     * \name Built-in type flyweights
 729     */
 730    /*@{*/
 731 #undef  DECL_TYPE
 732 #define DECL_TYPE(NAME, ...) static const glsl_type _##NAME##_type;
 733 #undef  STRUCT_TYPE
 734 #define STRUCT_TYPE(NAME)        static const glsl_type _struct_##NAME##_type;
 735 #include "builtin_type_macros.h"
 736    /*@}*/
 737
 738    /**
 739     * \name Friend functions.
 740     *
 741     * These functions are friends because they must have C linkage and the
 742     * need to call various private methods or access various private static
 743     * data.
 744     */
 745    /*@{*/
 746    friend void _mesa_glsl_initialize_types(struct _mesa_glsl_parse_state *);
 747    friend void _mesa_glsl_release_types(void);
 748    /*@}*/
 749 };
 750
 751 #undef DECL_TYPE
 752 #undef STRUCT_TYPE
 753 #endif /* __cplusplus */
 754
 755 struct glsl_struct_field {
 756    const struct glsl_type *type;
 757    const char *name;
 758
 759    /**
 760     * For interface blocks, gl_varying_slot corresponding to the input/output
 761     * if this is a built-in input/output (i.e. a member of the built-in
 762     * gl_PerVertex interface block); -1 otherwise.
 763     *
 764     * Ignored for structs.
 765     */
 766    int location;
 767
 768    /**
 769     * For interface blocks, the interpolation mode (as in
 770     * ir_variable::interpolation).  0 otherwise.
 771     */
 772    unsigned interpolation:2;
 773
 774    /**
 775     * For interface blocks, 1 if this variable uses centroid interpolation (as
 776     * in ir_variable::centroid).  0 otherwise.
 777     */
 778    unsigned centroid:1;
 779
 780    /**
 781     * For interface blocks, 1 if this variable uses sample interpolation (as
 782     * in ir_variable::sample). 0 otherwise.
 783     */
 784    unsigned sample:1;
 785
 786    /**
 787     * Layout of the matrix.  Uses glsl_matrix_layout values.
 788     */
 789    unsigned matrix_layout:2;
 790
 791    /**
 792     * For interface blocks, 1 if this variable is a per-patch input or output
 793     * (as in ir_variable::patch). 0 otherwise.
 794     */
 795    unsigned patch:1;
 796
 797    /**
 798     * For interface blocks, it has a value if this variable uses multiple vertex
 799     * streams (as in ir_variable::stream). -1 otherwise.
 800     */
 801    int stream;
 802
 803 #ifdef __cplusplus
 804    glsl_struct_field(const struct glsl_type *_type, const char *_name)
 805       : type(_type), name(_name), location(-1), interpolation(0), centroid(0),
 806         sample(0), matrix_layout(GLSL_MATRIX_LAYOUT_INHERITED), patch(0),
 807         stream(-1)
 808    {
 809       /* empty */
 810    }
 811
 812    glsl_struct_field()
 813    {
 814       /* empty */
 815    }
 816 #endif
 817 };
 818
 819 struct glsl_function_param {
 820    const struct glsl_type *type;
 821
 822    bool in;
 823    bool out;
 824 };
 825
 826 static inline unsigned int
 827 glsl_align(unsigned int a, unsigned int align)
 828 {
 829    return (a + align - 1) / align * align;
 830 }
 831
 832 #endif /* GLSL_TYPES_H */