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 extern "C" {
  33 #include "GL/gl.h"
  34 }
  35
  36 #include "ralloc.h"
  37
  38 struct _mesa_glsl_parse_state;
  39 struct glsl_symbol_table;
  40
  41 extern "C" void
  42 _mesa_glsl_initialize_types(struct _mesa_glsl_parse_state *state);
  43
  44 extern "C" void
  45 _mesa_glsl_release_types(void);
  46
  47 enum glsl_base_type {
  48    GLSL_TYPE_UINT = 0,
  49    GLSL_TYPE_INT,
  50    GLSL_TYPE_FLOAT,
  51    GLSL_TYPE_BOOL,
  52    GLSL_TYPE_SAMPLER,
  53    GLSL_TYPE_STRUCT,
  54    GLSL_TYPE_ARRAY,
  55    GLSL_TYPE_VOID,
  56    GLSL_TYPE_ERROR
  57 };
  58
  59 enum glsl_sampler_dim {
  60    GLSL_SAMPLER_DIM_1D = 0,
  61    GLSL_SAMPLER_DIM_2D,
  62    GLSL_SAMPLER_DIM_3D,
  63    GLSL_SAMPLER_DIM_CUBE,
  64    GLSL_SAMPLER_DIM_RECT,
  65    GLSL_SAMPLER_DIM_BUF
  66 };
  67
  68
  69 struct glsl_type {
  70    GLenum gl_type;
  71    glsl_base_type base_type;
  72
  73    unsigned sampler_dimensionality:3; /**< \see glsl_sampler_dim */
  74    unsigned sampler_shadow:1;
  75    unsigned sampler_array:1;
  76    unsigned sampler_type:2;    /**< Type of data returned using this sampler.
  77                                 * only \c GLSL_TYPE_FLOAT, \c GLSL_TYPE_INT,
  78                                 * and \c GLSL_TYPE_UINT are valid.
  79                                 */
  80
  81    /* Callers of this ralloc-based new need not call delete. It's
  82     * easier to just ralloc_free 'mem_ctx' (or any of its ancestors). */
  83    static void* operator new(size_t size)
  84    {
  85       if (glsl_type::mem_ctx == NULL) {
  86          glsl_type::mem_ctx = ralloc_context(NULL);
  87          assert(glsl_type::mem_ctx != NULL);
  88       }
  89
  90       void *type;
  91
  92       type = ralloc_size(glsl_type::mem_ctx, size);
  93       assert(type != NULL);
  94
  95       return type;
  96    }
  97
  98    /* If the user *does* call delete, that's OK, we will just
  99     * ralloc_free in that case. */
 100    static void operator delete(void *type)
 101    {
 102       ralloc_free(type);
 103    }
 104
 105    /**
 106     * \name Vector and matrix element counts
 107     *
 108     * For scalars, each of these values will be 1.  For non-numeric types
 109     * these will be 0.
 110     */
 111    /*@{*/
 112    unsigned vector_elements:3; /**< 1, 2, 3, or 4 vector elements. */
 113    unsigned matrix_columns:3;  /**< 1, 2, 3, or 4 matrix columns. */
 114    /*@}*/
 115
 116    /**
 117     * Name of the data type
 118     *
 119     * This may be \c NULL for anonymous structures, for arrays, or for
 120     * function types.
 121     */
 122    const char *name;
 123
 124    /**
 125     * For \c GLSL_TYPE_ARRAY, this is the length of the array.  For
 126     * \c GLSL_TYPE_STRUCT, it is the number of elements in the structure and
 127     * the number of values pointed to by \c fields.structure (below).
 128     */
 129    unsigned length;
 130
 131    /**
 132     * Subtype of composite data types.
 133     */
 134    union {
 135       const struct glsl_type *array;            /**< Type of array elements. */
 136       const struct glsl_type *parameters;       /**< Parameters to function. */
 137       struct glsl_struct_field *structure;      /**< List of struct fields. */
 138    } fields;
 139
 140
 141    /**
 142     * \name Pointers to various public type singletons
 143     */
 144    /*@{*/
 145    static const glsl_type *const error_type;
 146    static const glsl_type *const void_type;
 147    static const glsl_type *const int_type;
 148    static const glsl_type *const ivec4_type;
 149    static const glsl_type *const uint_type;
 150    static const glsl_type *const uvec2_type;
 151    static const glsl_type *const uvec3_type;
 152    static const glsl_type *const uvec4_type;
 153    static const glsl_type *const float_type;
 154    static const glsl_type *const vec2_type;
 155    static const glsl_type *const vec3_type;
 156    static const glsl_type *const vec4_type;
 157    static const glsl_type *const bool_type;
 158    static const glsl_type *const mat2_type;
 159    static const glsl_type *const mat2x3_type;
 160    static const glsl_type *const mat2x4_type;
 161    static const glsl_type *const mat3x2_type;
 162    static const glsl_type *const mat3_type;
 163    static const glsl_type *const mat3x4_type;
 164    static const glsl_type *const mat4x2_type;
 165    static const glsl_type *const mat4x3_type;
 166    static const glsl_type *const mat4_type;
 167    /*@}*/
 168
 169
 170    /**
 171     * For numeric and boolean derrived types returns the basic scalar type
 172     *
 173     * If the type is a numeric or boolean scalar, vector, or matrix type,
 174     * this function gets the scalar type of the individual components.  For
 175     * all other types, including arrays of numeric or boolean types, the
 176     * error type is returned.
 177     */
 178    const glsl_type *get_base_type() const;
 179
 180    /**
 181     * Query the type of elements in an array
 182     *
 183     * \return
 184     * Pointer to the type of elements in the array for array types, or \c NULL
 185     * for non-array types.
 186     */
 187    const glsl_type *element_type() const
 188    {
 189       return is_array() ? fields.array : NULL;
 190    }
 191
 192    /**
 193     * Get the instance of a built-in scalar, vector, or matrix type
 194     */
 195    static const glsl_type *get_instance(unsigned base_type, unsigned rows,
 196                                         unsigned columns);
 197
 198    /**
 199     * Get the instance of an array type
 200     */
 201    static const glsl_type *get_array_instance(const glsl_type *base,
 202                                               unsigned elements);
 203
 204    /**
 205     * Get the instance of a record type
 206     */
 207    static const glsl_type *get_record_instance(const glsl_struct_field *fields,
 208                                                unsigned num_fields,
 209                                                const char *name);
 210
 211    /**
 212     * Query the total number of scalars that make up a scalar, vector or matrix
 213     */
 214    unsigned components() const
 215    {
 216       return vector_elements * matrix_columns;
 217    }
 218
 219    /**
 220     * Calculate the number of components slots required to hold this type
 221     *
 222     * This is used to determine how many uniform or varying locations a type
 223     * might occupy.
 224     */
 225    unsigned component_slots() const;
 226
 227    /**
 228     * \brief Can this type be implicitly converted to another?
 229     *
 230     * \return True if the types are identical or if this type can be converted
 231     *         to \c desired according to Section 4.1.10 of the GLSL spec.
 232     *
 233     * \verbatim
 234     * From page 25 (31 of the pdf) of the GLSL 1.50 spec, Section 4.1.10
 235     * Implicit Conversions:
 236     *
 237     *     In some situations, an expression and its type will be implicitly
 238     *     converted to a different type. The following table shows all allowed
 239     *     implicit conversions:
 240     *
 241     *     Type of expression | Can be implicitly converted to
 242     *     --------------------------------------------------
 243     *     int                  float
 244     *     uint
 245     *
 246     *     ivec2                vec2
 247     *     uvec2
 248     *
 249     *     ivec3                vec3
 250     *     uvec3
 251     *
 252     *     ivec4                vec4
 253     *     uvec4
 254     *
 255     *     There are no implicit array or structure conversions. For example,
 256     *     an array of int cannot be implicitly converted to an array of float.
 257     *     There are no implicit conversions between signed and unsigned
 258     *     integers.
 259     * \endverbatim
 260     */
 261    bool can_implicitly_convert_to(const glsl_type *desired) const;
 262
 263    /**
 264     * Query whether or not a type is a scalar (non-vector and non-matrix).
 265     */
 266    bool is_scalar() const
 267    {
 268       return (vector_elements == 1)
 269          && (base_type >= GLSL_TYPE_UINT)
 270          && (base_type <= GLSL_TYPE_BOOL);
 271    }
 272
 273    /**
 274     * Query whether or not a type is a vector
 275     */
 276    bool is_vector() const
 277    {
 278       return (vector_elements > 1)
 279          && (matrix_columns == 1)
 280          && (base_type >= GLSL_TYPE_UINT)
 281          && (base_type <= GLSL_TYPE_BOOL);
 282    }
 283
 284    /**
 285     * Query whether or not a type is a matrix
 286     */
 287    bool is_matrix() const
 288    {
 289       /* GLSL only has float matrices. */
 290       return (matrix_columns > 1) && (base_type == GLSL_TYPE_FLOAT);
 291    }
 292
 293    /**
 294     * Query whether or not a type is a non-array numeric type
 295     */
 296    bool is_numeric() const
 297    {
 298       return (base_type >= GLSL_TYPE_UINT) && (base_type <= GLSL_TYPE_FLOAT);
 299    }
 300
 301    /**
 302     * Query whether or not a type is an integral type
 303     */
 304    bool is_integer() const
 305    {
 306       return (base_type == GLSL_TYPE_UINT) || (base_type == GLSL_TYPE_INT);
 307    }
 308
 309    /**
 310     * Query whether or not a type is a float type
 311     */
 312    bool is_float() const
 313    {
 314       return base_type == GLSL_TYPE_FLOAT;
 315    }
 316
 317    /**
 318     * Query whether or not a type is a non-array boolean type
 319     */
 320    bool is_boolean() const
 321    {
 322       return base_type == GLSL_TYPE_BOOL;
 323    }
 324
 325    /**
 326     * Query whether or not a type is a sampler
 327     */
 328    bool is_sampler() const
 329    {
 330       return base_type == GLSL_TYPE_SAMPLER;
 331    }
 332
 333    /**
 334     * Query whether or not type is a sampler, or for struct and array
 335     * types, contains a sampler.
 336     */
 337    bool contains_sampler() const;
 338
 339    /**
 340     * Query whether or not a type is an array
 341     */
 342    bool is_array() const
 343    {
 344       return base_type == GLSL_TYPE_ARRAY;
 345    }
 346
 347    /**
 348     * Query whether or not a type is a record
 349     */
 350    bool is_record() const
 351    {
 352       return base_type == GLSL_TYPE_STRUCT;
 353    }
 354
 355    /**
 356     * Query whether or not a type is the void type singleton.
 357     */
 358    bool is_void() const
 359    {
 360       return base_type == GLSL_TYPE_VOID;
 361    }
 362
 363    /**
 364     * Query whether or not a type is the error type singleton.
 365     */
 366    bool is_error() const
 367    {
 368       return base_type == GLSL_TYPE_ERROR;
 369    }
 370
 371    /**
 372     * Query the full type of a matrix row
 373     *
 374     * \return
 375     * If the type is not a matrix, \c glsl_type::error_type is returned.
 376     * Otherwise a type matching the rows of the matrix is returned.
 377     */
 378    const glsl_type *row_type() const
 379    {
 380       return is_matrix()
 381          ? get_instance(base_type, matrix_columns, 1)
 382          : error_type;
 383    }
 384
 385    /**
 386     * Query the full type of a matrix column
 387     *
 388     * \return
 389     * If the type is not a matrix, \c glsl_type::error_type is returned.
 390     * Otherwise a type matching the columns of the matrix is returned.
 391     */
 392    const glsl_type *column_type() const
 393    {
 394       return is_matrix()
 395          ? get_instance(base_type, vector_elements, 1)
 396          : error_type;
 397    }
 398
 399
 400    /**
 401     * Get the type of a structure field
 402     *
 403     * \return
 404     * Pointer to the type of the named field.  If the type is not a structure
 405     * or the named field does not exist, \c glsl_type::error_type is returned.
 406     */
 407    const glsl_type *field_type(const char *name) const;
 408
 409
 410    /**
 411     * Get the location of a filed within a record type
 412     */
 413    int field_index(const char *name) const;
 414
 415
 416    /**
 417     * Query the number of elements in an array type
 418     *
 419     * \return
 420     * The number of elements in the array for array types or -1 for non-array
 421     * types.  If the number of elements in the array has not yet been declared,
 422     * zero is returned.
 423     */
 424    int array_size() const
 425    {
 426       return is_array() ? length : -1;
 427    }
 428
 429 private:
 430    /**
 431     * ralloc context for all glsl_type allocations
 432     *
 433     * Set on the first call to \c glsl_type::new.
 434     */
 435    static void *mem_ctx;
 436
 437    void init_ralloc_type_ctx(void);
 438
 439    /** Constructor for vector and matrix types */
 440    glsl_type(GLenum gl_type,
 441              glsl_base_type base_type, unsigned vector_elements,
 442              unsigned matrix_columns, const char *name);
 443
 444    /** Constructor for sampler types */
 445    glsl_type(GLenum gl_type,
 446              enum glsl_sampler_dim dim, bool shadow, bool array,
 447              unsigned type, const char *name);
 448
 449    /** Constructor for record types */
 450    glsl_type(const glsl_struct_field *fields, unsigned num_fields,
 451              const char *name);
 452
 453    /** Constructor for array types */
 454    glsl_type(const glsl_type *array, unsigned length);
 455
 456    /** Hash table containing the known array types. */
 457    static struct hash_table *array_types;
 458
 459    /** Hash table containing the known record types. */
 460    static struct hash_table *record_types;
 461
 462    static int record_key_compare(const void *a, const void *b);
 463    static unsigned record_key_hash(const void *key);
 464
 465    /**
 466     * \name Pointers to various type singletons
 467     */
 468    /*@{*/
 469    static const glsl_type _error_type;
 470    static const glsl_type _void_type;
 471    static const glsl_type _sampler3D_type;
 472    static const glsl_type builtin_core_types[];
 473    static const glsl_type builtin_structure_types[];
 474    static const glsl_type builtin_110_deprecated_structure_types[];
 475    static const glsl_type builtin_110_types[];
 476    static const glsl_type builtin_120_types[];
 477    static const glsl_type builtin_130_types[];
 478    static const glsl_type builtin_ARB_texture_rectangle_types[];
 479    static const glsl_type builtin_EXT_texture_array_types[];
 480    static const glsl_type builtin_EXT_texture_buffer_object_types[];
 481    /*@}*/
 482
 483    /**
 484     * \name Methods to populate a symbol table with built-in types.
 485     *
 486     * \internal
 487     * This is one of the truely annoying things about C++.  Methods that are
 488     * completely internal and private to a type still have to be advertised to
 489     * the world in a public header file.
 490     */
 491    /*@{*/
 492    static void generate_100ES_types(glsl_symbol_table *);
 493    static void generate_110_types(glsl_symbol_table *);
 494    static void generate_120_types(glsl_symbol_table *);
 495    static void generate_130_types(glsl_symbol_table *);
 496    static void generate_ARB_texture_rectangle_types(glsl_symbol_table *, bool);
 497    static void generate_EXT_texture_array_types(glsl_symbol_table *, bool);
 498    static void generate_OES_texture_3D_types(glsl_symbol_table *, bool);
 499    /*@}*/
 500
 501    /**
 502     * \name Friend functions.
 503     *
 504     * These functions are friends because they must have C linkage and the
 505     * need to call various private methods or access various private static
 506     * data.
 507     */
 508    /*@{*/
 509    friend void _mesa_glsl_initialize_types(struct _mesa_glsl_parse_state *);
 510    friend void _mesa_glsl_release_types(void);
 511    /*@}*/
 512 };
 513
 514 struct glsl_struct_field {
 515    const struct glsl_type *type;
 516    const char *name;
 517 };
 518
 519 #endif /* GLSL_TYPES_H */