src/compiler/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_INTERFACE,
  60    GLSL_TYPE_ARRAY,
  61    GLSL_TYPE_VOID,
  62    GLSL_TYPE_SUBROUTINE,
  63    GLSL_TYPE_FUNCTION,
  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    GLSL_INTERFACE_PACKING_STD430
  83 };
  84
  85 enum glsl_matrix_layout {
  86    /**
  87     * The layout of the matrix is inherited from the object containing the
  88     * matrix (the top level structure or the uniform block).
  89     */
  90    GLSL_MATRIX_LAYOUT_INHERITED,
  91
  92    /**
  93     * Explicit column-major layout
  94     *
  95     * If a uniform block doesn't have an explicit layout set, it will default
  96     * to this layout.
  97     */
  98    GLSL_MATRIX_LAYOUT_COLUMN_MAJOR,
  99
 100    /**
 101     * Row-major layout
 102     */
 103    GLSL_MATRIX_LAYOUT_ROW_MAJOR
 104 };
 105
 106 enum {
 107    GLSL_PRECISION_NONE = 0,
 108    GLSL_PRECISION_HIGH,
 109    GLSL_PRECISION_MEDIUM,
 110    GLSL_PRECISION_LOW
 111 };
 112
 113 #ifdef __cplusplus
 114 #include "GL/gl.h"
 115 #include "util/ralloc.h"
 116 #include "main/mtypes.h" /* for gl_texture_index, C++'s enum rules are broken */
 117
 118 struct glsl_type {
 119    GLenum gl_type;
 120    glsl_base_type base_type;
 121
 122    unsigned sampler_dimensionality:3; /**< \see glsl_sampler_dim */
 123    unsigned sampler_shadow:1;
 124    unsigned sampler_array:1;
 125    unsigned sampled_type:2;    /**< Type of data returned using this
 126                                 * sampler or image.  Only \c
 127                                 * GLSL_TYPE_FLOAT, \c GLSL_TYPE_INT,
 128                                 * and \c GLSL_TYPE_UINT are valid.
 129                                 */
 130    unsigned interface_packing:2;
 131
 132    /* Callers of this ralloc-based new need not call delete. It's
 133     * easier to just ralloc_free 'mem_ctx' (or any of its ancestors). */
 134    static void* operator new(size_t size)
 135    {
 136       mtx_lock(&glsl_type::mutex);
 137
 138       /* mem_ctx should have been created by the static members */
 139       assert(glsl_type::mem_ctx != NULL);
 140
 141       void *type;
 142
 143       type = ralloc_size(glsl_type::mem_ctx, size);
 144       assert(type != NULL);
 145
 146       mtx_unlock(&glsl_type::mutex);
 147
 148       return type;
 149    }
 150
 151    /* If the user *does* call delete, that's OK, we will just
 152     * ralloc_free in that case. */
 153    static void operator delete(void *type)
 154    {
 155       mtx_lock(&glsl_type::mutex);
 156       ralloc_free(type);
 157       mtx_unlock(&glsl_type::mutex);
 158    }
 159
 160    /**
 161     * \name Vector and matrix element counts
 162     *
 163     * For scalars, each of these values will be 1.  For non-numeric types
 164     * these will be 0.
 165     */
 166    /*@{*/
 167    uint8_t vector_elements;    /**< 1, 2, 3, or 4 vector elements. */
 168    uint8_t matrix_columns;     /**< 1, 2, 3, or 4 matrix columns. */
 169    /*@}*/
 170
 171    /**
 172     * For \c GLSL_TYPE_ARRAY, this is the length of the array.  For
 173     * \c GLSL_TYPE_STRUCT or \c GLSL_TYPE_INTERFACE, it is the number of
 174     * elements in the structure and the number of values pointed to by
 175     * \c fields.structure (below).
 176     */
 177    unsigned length;
 178
 179    /**
 180     * Name of the data type
 181     *
 182     * Will never be \c NULL.
 183     */
 184    const char *name;
 185
 186    /**
 187     * Subtype of composite data types.
 188     */
 189    union {
 190       const struct glsl_type *array;            /**< Type of array elements. */
 191       struct glsl_function_param *parameters;   /**< Parameters to function. */
 192       struct glsl_struct_field *structure;      /**< List of struct fields. */
 193    } fields;
 194
 195    /**
 196     * \name Pointers to various public type singletons
 197     */
 198    /*@{*/
 199 #undef  DECL_TYPE
 200 #define DECL_TYPE(NAME, ...) \
 201    static const glsl_type *const NAME##_type;
 202 #undef  STRUCT_TYPE
 203 #define STRUCT_TYPE(NAME) \
 204    static const glsl_type *const struct_##NAME##_type;
 205 #include "compiler/builtin_type_macros.h"
 206    /*@}*/
 207
 208    /**
 209     * Convenience accessors for vector types (shorter than get_instance()).
 210     * @{
 211     */
 212    static const glsl_type *vec(unsigned components);
 213    static const glsl_type *dvec(unsigned components);
 214    static const glsl_type *ivec(unsigned components);
 215    static const glsl_type *uvec(unsigned components);
 216    static const glsl_type *bvec(unsigned components);
 217    /**@}*/
 218
 219    /**
 220     * For numeric and boolean derived types returns the basic scalar type
 221     *
 222     * If the type is a numeric or boolean scalar, vector, or matrix type,
 223     * this function gets the scalar type of the individual components.  For
 224     * all other types, including arrays of numeric or boolean types, the
 225     * error type is returned.
 226     */
 227    const glsl_type *get_base_type() const;
 228
 229    /**
 230     * Get the basic scalar type which this type aggregates.
 231     *
 232     * If the type is a numeric or boolean scalar, vector, or matrix, or an
 233     * array of any of those, this function gets the scalar type of the
 234     * individual components.  For structs and arrays of structs, this function
 235     * returns the struct type.  For samplers and arrays of samplers, this
 236     * function returns the sampler type.
 237     */
 238    const glsl_type *get_scalar_type() const;
 239
 240    /**
 241     * Get the instance of a built-in scalar, vector, or matrix type
 242     */
 243    static const glsl_type *get_instance(unsigned base_type, unsigned rows,
 244                                         unsigned columns);
 245
 246    /**
 247     * Get the instance of a sampler type
 248     */
 249    static const glsl_type *get_sampler_instance(enum glsl_sampler_dim dim,
 250                                                 bool shadow,
 251                                                 bool array,
 252                                                 glsl_base_type type);
 253
 254    static const glsl_type *get_image_instance(enum glsl_sampler_dim dim,
 255                                               bool array, glsl_base_type type);
 256
 257    /**
 258     * Get the instance of an array type
 259     */
 260    static const glsl_type *get_array_instance(const glsl_type *base,
 261                                               unsigned elements);
 262
 263    /**
 264     * Get the instance of a record type
 265     */
 266    static const glsl_type *get_record_instance(const glsl_struct_field *fields,
 267                                                unsigned num_fields,
 268                                                const char *name);
 269
 270    /**
 271     * Get the instance of an interface block type
 272     */
 273    static const glsl_type *get_interface_instance(const glsl_struct_field *fields,
 274                                                   unsigned num_fields,
 275                                                   enum glsl_interface_packing packing,
 276                                                   const char *block_name);
 277
 278    /**
 279     * Get the instance of an subroutine type
 280     */
 281    static const glsl_type *get_subroutine_instance(const char *subroutine_name);
 282
 283    /**
 284     * Get the instance of a function type
 285     */
 286    static const glsl_type *get_function_instance(const struct glsl_type *return_type,
 287                                                  const glsl_function_param *parameters,
 288                                                  unsigned num_params);
 289
 290    /**
 291     * Get the type resulting from a multiplication of \p type_a * \p type_b
 292     */
 293    static const glsl_type *get_mul_type(const glsl_type *type_a,
 294                                         const glsl_type *type_b);
 295
 296    /**
 297     * Query the total number of scalars that make up a scalar, vector or matrix
 298     */
 299    unsigned components() const
 300    {
 301       return vector_elements * matrix_columns;
 302    }
 303
 304    /**
 305     * Calculate the number of components slots required to hold this type
 306     *
 307     * This is used to determine how many uniform or varying locations a type
 308     * might occupy.
 309     */
 310    unsigned component_slots() const;
 311
 312    /**
 313     * Calculate offset between the base location of the struct in
 314     * uniform storage and a struct member.
 315     * For the initial call, length is the index of the member to find the
 316     * offset for.
 317     */
 318    unsigned record_location_offset(unsigned length) const;
 319
 320    /**
 321     * Calculate the number of unique values from glGetUniformLocation for the
 322     * elements of the type.
 323     *
 324     * This is used to allocate slots in the UniformRemapTable, the amount of
 325     * locations may not match with actual used storage space by the driver.
 326     */
 327    unsigned uniform_locations() const;
 328
 329    /**
 330     * Used to count the number of varyings contained in the type ignoring
 331     * innermost array elements.
 332     */
 333    unsigned varying_count() const;
 334
 335    /**
 336     * Calculate the number of attribute slots required to hold this type
 337     *
 338     * This implements the language rules of GLSL 1.50 for counting the number
 339     * of slots used by a vertex attribute.  It also determines the number of
 340     * varying slots the type will use up in the absence of varying packing
 341     * (and thus, it can be used to measure the number of varying slots used by
 342     * the varyings that are generated by lower_packed_varyings).
 343     *
 344     * For vertex shader attributes - doubles only take one slot.
 345     * For inter-shader varyings - dvec3/dvec4 take two slots.
 346     */
 347    unsigned count_attribute_slots(bool is_vertex_input) const;
 348
 349    /**
 350     * Alignment in bytes of the start of this type in a std140 uniform
 351     * block.
 352     */
 353    unsigned std140_base_alignment(bool row_major) const;
 354
 355    /** Size in bytes of this type in a std140 uniform block.
 356     *
 357     * Note that this is not GL_UNIFORM_SIZE (which is the number of
 358     * elements in the array)
 359     */
 360    unsigned std140_size(bool row_major) const;
 361
 362    /**
 363     * Alignment in bytes of the start of this type in a std430 shader
 364     * storage block.
 365     */
 366    unsigned std430_base_alignment(bool row_major) const;
 367
 368    /**
 369     * Calculate array stride in bytes of this type in a std430 shader storage
 370     * block.
 371     */
 372    unsigned std430_array_stride(bool row_major) const;
 373
 374    /**
 375     * Size in bytes of this type in a std430 shader storage block.
 376     *
 377     * Note that this is not GL_BUFFER_SIZE
 378     */
 379    unsigned std430_size(bool row_major) const;
 380
 381    /**
 382     * \brief Can this type be implicitly converted to another?
 383     *
 384     * \return True if the types are identical or if this type can be converted
 385     *         to \c desired according to Section 4.1.10 of the GLSL spec.
 386     *
 387     * \verbatim
 388     * From page 25 (31 of the pdf) of the GLSL 1.50 spec, Section 4.1.10
 389     * Implicit Conversions:
 390     *
 391     *     In some situations, an expression and its type will be implicitly
 392     *     converted to a different type. The following table shows all allowed
 393     *     implicit conversions:
 394     *
 395     *     Type of expression | Can be implicitly converted to
 396     *     --------------------------------------------------
 397     *     int                  float
 398     *     uint
 399     *
 400     *     ivec2                vec2
 401     *     uvec2
 402     *
 403     *     ivec3                vec3
 404     *     uvec3
 405     *
 406     *     ivec4                vec4
 407     *     uvec4
 408     *
 409     *     There are no implicit array or structure conversions. For example,
 410     *     an array of int cannot be implicitly converted to an array of float.
 411     *     There are no implicit conversions between signed and unsigned
 412     *     integers.
 413     * \endverbatim
 414     */
 415    bool can_implicitly_convert_to(const glsl_type *desired,
 416                                   _mesa_glsl_parse_state *state) const;
 417
 418    /**
 419     * Query whether or not a type is a scalar (non-vector and non-matrix).
 420     */
 421    bool is_scalar() const
 422    {
 423       return (vector_elements == 1)
 424          && (base_type >= GLSL_TYPE_UINT)
 425          && (base_type <= GLSL_TYPE_BOOL);
 426    }
 427
 428    /**
 429     * Query whether or not a type is a vector
 430     */
 431    bool is_vector() const
 432    {
 433       return (vector_elements > 1)
 434          && (matrix_columns == 1)
 435          && (base_type >= GLSL_TYPE_UINT)
 436          && (base_type <= GLSL_TYPE_BOOL);
 437    }
 438
 439    /**
 440     * Query whether or not a type is a matrix
 441     */
 442    bool is_matrix() const
 443    {
 444       /* GLSL only has float matrices. */
 445       return (matrix_columns > 1) && (base_type == GLSL_TYPE_FLOAT || base_type == GLSL_TYPE_DOUBLE);
 446    }
 447
 448    /**
 449     * Query whether or not a type is a non-array numeric type
 450     */
 451    bool is_numeric() const
 452    {
 453       return (base_type >= GLSL_TYPE_UINT) && (base_type <= GLSL_TYPE_DOUBLE);
 454    }
 455
 456    /**
 457     * Query whether or not a type is an integral type
 458     */
 459    bool is_integer() const
 460    {
 461       return (base_type == GLSL_TYPE_UINT) || (base_type == GLSL_TYPE_INT);
 462    }
 463
 464    /**
 465     * Query whether or not type is an integral type, or for struct and array
 466     * types, contains an integral type.
 467     */
 468    bool contains_integer() const;
 469
 470    /**
 471     * Query whether or not type is a double type, or for struct and array
 472     * types, contains a double type.
 473     */
 474    bool contains_double() const;
 475
 476    /**
 477     * Query whether or not a type is a float type
 478     */
 479    bool is_float() const
 480    {
 481       return base_type == GLSL_TYPE_FLOAT;
 482    }
 483
 484    /**
 485     * Query whether or not a type is a double type
 486     */
 487    bool is_double() const
 488    {
 489       return base_type == GLSL_TYPE_DOUBLE;
 490    }
 491
 492    /**
 493     * Query whether a double takes two slots.
 494     */
 495    bool is_dual_slot_double() const
 496    {
 497       return base_type == GLSL_TYPE_DOUBLE && vector_elements > 2;
 498    }
 499
 500    /**
 501     * Query whether or not a type is a non-array boolean type
 502     */
 503    bool is_boolean() const
 504    {
 505       return base_type == GLSL_TYPE_BOOL;
 506    }
 507
 508    /**
 509     * Query whether or not a type is a sampler
 510     */
 511    bool is_sampler() const
 512    {
 513       return base_type == GLSL_TYPE_SAMPLER;
 514    }
 515
 516    /**
 517     * Query whether or not type is a sampler, or for struct and array
 518     * types, contains a sampler.
 519     */
 520    bool contains_sampler() const;
 521
 522    /**
 523     * Get the Mesa texture target index for a sampler type.
 524     */
 525    gl_texture_index sampler_index() const;
 526
 527    /**
 528     * Query whether or not type is an image, or for struct and array
 529     * types, contains an image.
 530     */
 531    bool contains_image() const;
 532
 533    /**
 534     * Query whether or not a type is an image
 535     */
 536    bool is_image() const
 537    {
 538       return base_type == GLSL_TYPE_IMAGE;
 539    }
 540
 541    /**
 542     * Query whether or not a type is an array
 543     */
 544    bool is_array() const
 545    {
 546       return base_type == GLSL_TYPE_ARRAY;
 547    }
 548
 549    bool is_array_of_arrays() const
 550    {
 551       return is_array() && fields.array->is_array();
 552    }
 553
 554    /**
 555     * Query whether or not a type is a record
 556     */
 557    bool is_record() const
 558    {
 559       return base_type == GLSL_TYPE_STRUCT;
 560    }
 561
 562    /**
 563     * Query whether or not a type is an interface
 564     */
 565    bool is_interface() const
 566    {
 567       return base_type == GLSL_TYPE_INTERFACE;
 568    }
 569
 570    /**
 571     * Query whether or not a type is the void type singleton.
 572     */
 573    bool is_void() const
 574    {
 575       return base_type == GLSL_TYPE_VOID;
 576    }
 577
 578    /**
 579     * Query whether or not a type is the error type singleton.
 580     */
 581    bool is_error() const
 582    {
 583       return base_type == GLSL_TYPE_ERROR;
 584    }
 585
 586    /**
 587     * Query if a type is unnamed/anonymous (named by the parser)
 588     */
 589
 590    bool is_subroutine() const
 591    {
 592       return base_type == GLSL_TYPE_SUBROUTINE;
 593    }
 594    bool contains_subroutine() const;
 595
 596    bool is_anonymous() const
 597    {
 598       return !strncmp(name, "#anon", 5);
 599    }
 600
 601    /**
 602     * Get the type stripped of any arrays
 603     *
 604     * \return
 605     * Pointer to the type of elements of the first non-array type for array
 606     * types, or pointer to itself for non-array types.
 607     */
 608    const glsl_type *without_array() const
 609    {
 610       const glsl_type *t = this;
 611
 612       while (t->is_array())
 613          t = t->fields.array;
 614
 615       return t;
 616    }
 617
 618    /**
 619     * Return the total number of elements in an array including the elements
 620     * in arrays of arrays.
 621     */
 622    unsigned arrays_of_arrays_size() const
 623    {
 624       if (!is_array())
 625          return 0;
 626
 627       unsigned size = length;
 628       const glsl_type *base_type = fields.array;
 629
 630       while (base_type->is_array()) {
 631          size = size * base_type->length;
 632          base_type = base_type->fields.array;
 633       }
 634       return size;
 635    }
 636
 637    /**
 638     * Return the amount of atomic counter storage required for a type.
 639     */
 640    unsigned atomic_size() const
 641    {
 642       if (base_type == GLSL_TYPE_ATOMIC_UINT)
 643          return ATOMIC_COUNTER_SIZE;
 644       else if (is_array())
 645          return length * fields.array->atomic_size();
 646       else
 647          return 0;
 648    }
 649
 650    /**
 651     * Return whether a type contains any atomic counters.
 652     */
 653    bool contains_atomic() const
 654    {
 655       return atomic_size() > 0;
 656    }
 657
 658    /**
 659     * Return whether a type contains any opaque types.
 660     */
 661    bool contains_opaque() const;
 662
 663    /**
 664     * Query the full type of a matrix row
 665     *
 666     * \return
 667     * If the type is not a matrix, \c glsl_type::error_type is returned.
 668     * Otherwise a type matching the rows of the matrix is returned.
 669     */
 670    const glsl_type *row_type() const
 671    {
 672       return is_matrix()
 673          ? get_instance(base_type, matrix_columns, 1)
 674          : error_type;
 675    }
 676
 677    /**
 678     * Query the full type of a matrix column
 679     *
 680     * \return
 681     * If the type is not a matrix, \c glsl_type::error_type is returned.
 682     * Otherwise a type matching the columns of the matrix is returned.
 683     */
 684    const glsl_type *column_type() const
 685    {
 686       return is_matrix()
 687          ? get_instance(base_type, vector_elements, 1)
 688          : error_type;
 689    }
 690
 691    /**
 692     * Get the type of a structure field
 693     *
 694     * \return
 695     * Pointer to the type of the named field.  If the type is not a structure
 696     * or the named field does not exist, \c glsl_type::error_type is returned.
 697     */
 698    const glsl_type *field_type(const char *name) const;
 699
 700    /**
 701     * Get the location of a field within a record type
 702     */
 703    int field_index(const char *name) const;
 704
 705    /**
 706     * Query the number of elements in an array type
 707     *
 708     * \return
 709     * The number of elements in the array for array types or -1 for non-array
 710     * types.  If the number of elements in the array has not yet been declared,
 711     * zero is returned.
 712     */
 713    int array_size() const
 714    {
 715       return is_array() ? length : -1;
 716    }
 717
 718    /**
 719     * Query whether the array size for all dimensions has been declared.
 720     */
 721    bool is_unsized_array() const
 722    {
 723       return is_array() && length == 0;
 724    }
 725
 726    /**
 727     * Return the number of coordinate components needed for this
 728     * sampler or image type.
 729     *
 730     * This is based purely on the sampler's dimensionality.  For example, this
 731     * returns 1 for sampler1D, and 3 for sampler2DArray.
 732     *
 733     * Note that this is often different than actual coordinate type used in
 734     * a texturing built-in function, since those pack additional values (such
 735     * as the shadow comparitor or projector) into the coordinate type.
 736     */
 737    int coordinate_components() const;
 738
 739    /**
 740     * Compare a record type against another record type.
 741     *
 742     * This is useful for matching record types declared across shader stages.
 743     * The option to not match locations is to deal with places where the
 744     * same struct is defined in a block which has a location set on it.
 745     */
 746    bool record_compare(const glsl_type *b, bool match_locations = true) const;
 747
 748    /**
 749     * Get the type interface packing.
 750     */
 751    enum glsl_interface_packing get_interface_packing() const
 752    {
 753       return (enum glsl_interface_packing)interface_packing;
 754    }
 755
 756 private:
 757
 758    static mtx_t mutex;
 759
 760    /**
 761     * ralloc context for all glsl_type allocations
 762     *
 763     * Set on the first call to \c glsl_type::new.
 764     */
 765    static void *mem_ctx;
 766
 767    void init_ralloc_type_ctx(void);
 768
 769    /** Constructor for vector and matrix types */
 770    glsl_type(GLenum gl_type,
 771              glsl_base_type base_type, unsigned vector_elements,
 772              unsigned matrix_columns, const char *name);
 773
 774    /** Constructor for sampler or image types */
 775    glsl_type(GLenum gl_type, glsl_base_type base_type,
 776              enum glsl_sampler_dim dim, bool shadow, bool array,
 777              unsigned type, const char *name);
 778
 779    /** Constructor for record types */
 780    glsl_type(const glsl_struct_field *fields, unsigned num_fields,
 781              const char *name);
 782
 783    /** Constructor for interface types */
 784    glsl_type(const glsl_struct_field *fields, unsigned num_fields,
 785              enum glsl_interface_packing packing, const char *name);
 786
 787    /** Constructor for interface types */
 788    glsl_type(const glsl_type *return_type,
 789              const glsl_function_param *params, unsigned num_params);
 790
 791    /** Constructor for array types */
 792    glsl_type(const glsl_type *array, unsigned length);
 793
 794    /** Constructor for subroutine types */
 795    glsl_type(const char *name);
 796
 797    /** Hash table containing the known array types. */
 798    static struct hash_table *array_types;
 799
 800    /** Hash table containing the known record types. */
 801    static struct hash_table *record_types;
 802
 803    /** Hash table containing the known interface types. */
 804    static struct hash_table *interface_types;
 805
 806    /** Hash table containing the known subroutine types. */
 807    static struct hash_table *subroutine_types;
 808
 809    /** Hash table containing the known function types. */
 810    static struct hash_table *function_types;
 811
 812    static bool record_key_compare(const void *a, const void *b);
 813    static unsigned record_key_hash(const void *key);
 814
 815    /**
 816     * \name Built-in type flyweights
 817     */
 818    /*@{*/
 819 #undef  DECL_TYPE
 820 #define DECL_TYPE(NAME, ...) static const glsl_type _##NAME##_type;
 821 #undef  STRUCT_TYPE
 822 #define STRUCT_TYPE(NAME)        static const glsl_type _struct_##NAME##_type;
 823 #include "compiler/builtin_type_macros.h"
 824    /*@}*/
 825
 826    /**
 827     * \name Friend functions.
 828     *
 829     * These functions are friends because they must have C linkage and the
 830     * need to call various private methods or access various private static
 831     * data.
 832     */
 833    /*@{*/
 834    friend void _mesa_glsl_initialize_types(struct _mesa_glsl_parse_state *);
 835    friend void _mesa_glsl_release_types(void);
 836    /*@}*/
 837 };
 838
 839 #undef DECL_TYPE
 840 #undef STRUCT_TYPE
 841 #endif /* __cplusplus */
 842
 843 struct glsl_struct_field {
 844    const struct glsl_type *type;
 845    const char *name;
 846
 847    /**
 848     * For interface blocks, gl_varying_slot corresponding to the input/output
 849     * if this is a built-in input/output (i.e. a member of the built-in
 850     * gl_PerVertex interface block); -1 otherwise.
 851     *
 852     * Ignored for structs.
 853     */
 854    int location;
 855
 856    /**
 857     * For interface blocks, members may have an explicit byte offset
 858     * specified; -1 otherwise. Also used for xfb_offset layout qualifier.
 859     *
 860     * Unless used for xfb_offset this field is ignored for structs.
 861     */
 862    int offset;
 863
 864    /**
 865     * For interface blocks, members may define a transform feedback buffer;
 866     * -1 otherwise.
 867     */
 868    int xfb_buffer;
 869
 870    /**
 871     * For interface blocks, members may define a transform feedback stride;
 872     * -1 otherwise.
 873     */
 874    int xfb_stride;
 875
 876    /**
 877     * For interface blocks, the interpolation mode (as in
 878     * ir_variable::interpolation).  0 otherwise.
 879     */
 880    unsigned interpolation:2;
 881
 882    /**
 883     * For interface blocks, 1 if this variable uses centroid interpolation (as
 884     * in ir_variable::centroid).  0 otherwise.
 885     */
 886    unsigned centroid:1;
 887
 888    /**
 889     * For interface blocks, 1 if this variable uses sample interpolation (as
 890     * in ir_variable::sample). 0 otherwise.
 891     */
 892    unsigned sample:1;
 893
 894    /**
 895     * Layout of the matrix.  Uses glsl_matrix_layout values.
 896     */
 897    unsigned matrix_layout:2;
 898
 899    /**
 900     * For interface blocks, 1 if this variable is a per-patch input or output
 901     * (as in ir_variable::patch). 0 otherwise.
 902     */
 903    unsigned patch:1;
 904
 905    /**
 906     * Precision qualifier
 907     */
 908    unsigned precision:2;
 909
 910    /**
 911     * Image qualifiers, applicable to buffer variables defined in shader
 912     * storage buffer objects (SSBOs)
 913     */
 914    unsigned image_read_only:1;
 915    unsigned image_write_only:1;
 916    unsigned image_coherent:1;
 917    unsigned image_volatile:1;
 918    unsigned image_restrict:1;
 919
 920    /**
 921     * Any of the xfb_* qualifiers trigger the shader to be in transform
 922     * feedback mode so we need to keep track of whether the buffer was
 923     * explicitly set or if its just been assigned the default global value.
 924     */
 925    unsigned explicit_xfb_buffer:1;
 926
 927    unsigned implicit_sized_array:1;
 928 #ifdef __cplusplus
 929    glsl_struct_field(const struct glsl_type *_type, const char *_name)
 930       : type(_type), name(_name), location(-1), interpolation(0), centroid(0),
 931         sample(0), matrix_layout(GLSL_MATRIX_LAYOUT_INHERITED), patch(0),
 932         precision(GLSL_PRECISION_NONE), image_read_only(0), image_write_only(0),
 933         image_coherent(0), image_volatile(0), image_restrict(0)
 934    {
 935       /* empty */
 936    }
 937
 938    glsl_struct_field()
 939    {
 940       /* empty */
 941    }
 942 #endif
 943 };
 944
 945 struct glsl_function_param {
 946    const struct glsl_type *type;
 947
 948    bool in;
 949    bool out;
 950 };
 951
 952 static inline unsigned int
 953 glsl_align(unsigned int a, unsigned int align)
 954 {
 955    return (a + align - 1) / align * align;
 956 }
 957
 958 #endif /* GLSL_TYPES_H */