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