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 <cstring>
  30 #include <cassert>
  31
  32 extern "C" {
  33 #include "GL/gl.h"
  34 #include <talloc.h>
  35 }
  36
  37 struct _mesa_glsl_parse_state;
  38 struct glsl_symbol_table;
  39
  40 extern "C" void
  41 _mesa_glsl_initialize_types(struct _mesa_glsl_parse_state *state);
  42
  43 extern "C" void
  44 _mesa_glsl_release_types(void);
  45
  46 #define GLSL_TYPE_UINT          0
  47 #define GLSL_TYPE_INT           1
  48 #define GLSL_TYPE_FLOAT         2
  49 #define GLSL_TYPE_BOOL          3
  50 #define GLSL_TYPE_SAMPLER       4
  51 #define GLSL_TYPE_STRUCT        5
  52 #define GLSL_TYPE_ARRAY         6
  53 #define GLSL_TYPE_FUNCTION      7
  54 #define GLSL_TYPE_VOID          8
  55 #define GLSL_TYPE_ERROR         9
  56
  57 enum glsl_sampler_dim {
  58    GLSL_SAMPLER_DIM_1D = 0,
  59    GLSL_SAMPLER_DIM_2D,
  60    GLSL_SAMPLER_DIM_3D,
  61    GLSL_SAMPLER_DIM_CUBE,
  62    GLSL_SAMPLER_DIM_RECT,
  63    GLSL_SAMPLER_DIM_BUF
  64 };
  65
  66
  67 struct glsl_type {
  68    GLenum gl_type;
  69    unsigned base_type:4;
  70
  71    unsigned sampler_dimensionality:3;
  72    unsigned sampler_shadow:1;
  73    unsigned sampler_array:1;
  74    unsigned sampler_type:2;    /**< Type of data returned using this sampler.
  75                                 * only \c GLSL_TYPE_FLOAT, \c GLSL_TYPE_INT,
  76                                 * and \c GLSL_TYPE_UINT are valid.
  77                                 */
  78
  79    /* Callers of this talloc-based new need not call delete. It's
  80     * easier to just talloc_free 'mem_ctx' (or any of its ancestors). */
  81    static void* operator new(size_t size)
  82    {
  83       if (glsl_type::mem_ctx == NULL) {
  84          glsl_type::mem_ctx = talloc_init("glsl_type");
  85          assert(glsl_type::mem_ctx != NULL);
  86       }
  87
  88       void *type;
  89
  90       type = talloc_size(glsl_type::mem_ctx, size);
  91       assert(type != NULL);
  92
  93       return type;
  94    }
  95
  96    /* If the user *does* call delete, that's OK, we will just
  97     * talloc_free in that case. */
  98    static void operator delete(void *type)
  99    {
 100       talloc_free(type);
 101    }
 102
 103    /**
 104     * \name Vector and matrix element counts
 105     *
 106     * For scalars, each of these values will be 1.  For non-numeric types
 107     * these will be 0.
 108     */
 109    /*@{*/
 110    unsigned vector_elements:3; /**< 1, 2, 3, or 4 vector elements. */
 111    unsigned matrix_columns:3;  /**< 1, 2, 3, or 4 matrix columns. */
 112    /*@}*/
 113
 114    /**
 115     * Name of the data type
 116     *
 117     * This may be \c NULL for anonymous structures, for arrays, or for
 118     * function types.
 119     */
 120    const char *name;
 121
 122    /**
 123     * For \c GLSL_TYPE_ARRAY, this is the length of the array.  For
 124     * \c GLSL_TYPE_STRUCT, it is the number of elements in the structure and
 125     * the number of values pointed to by \c fields.structure (below).
 126     *
 127     * For \c GLSL_TYPE_FUNCTION, it is the number of parameters to the
 128     * function.  The return value from a function is implicitly the first
 129     * parameter.  The types of the parameters are stored in
 130     * \c fields.parameters (below).
 131     */
 132    unsigned length;
 133
 134    /**
 135     * Subtype of composite data types.
 136     */
 137    union {
 138       const struct glsl_type *array;            /**< Type of array elements. */
 139       const struct glsl_type *parameters;       /**< Parameters to function. */
 140       struct glsl_struct_field *structure;      /**< List of struct fields. */
 141    } fields;
 142
 143
 144    /**
 145     * \name Pointers to various public type singletons
 146     */
 147    /*@{*/
 148    static const glsl_type *const error_type;
 149    static const glsl_type *const int_type;
 150    static const glsl_type *const ivec4_type;
 151    static const glsl_type *const uint_type;
 152    static const glsl_type *const uvec2_type;
 153    static const glsl_type *const uvec3_type;
 154    static const glsl_type *const uvec4_type;
 155    static const glsl_type *const float_type;
 156    static const glsl_type *const vec2_type;
 157    static const glsl_type *const vec3_type;
 158    static const glsl_type *const vec4_type;
 159    static const glsl_type *const bool_type;
 160    static const glsl_type *const mat2_type;
 161    static const glsl_type *const mat2x3_type;
 162    static const glsl_type *const mat2x4_type;
 163    static const glsl_type *const mat3x2_type;
 164    static const glsl_type *const mat3_type;
 165    static const glsl_type *const mat3x4_type;
 166    static const glsl_type *const mat4x2_type;
 167    static const glsl_type *const mat4x3_type;
 168    static const glsl_type *const mat4_type;
 169    /*@}*/
 170
 171
 172    /**
 173     * For numeric and boolean derrived types returns the basic scalar type
 174     *
 175     * If the type is a numeric or boolean scalar, vector, or matrix type,
 176     * this function gets the scalar type of the individual components.  For
 177     * all other types, including arrays of numeric or boolean types, the
 178     * error type is returned.
 179     */
 180    const glsl_type *get_base_type() const;
 181
 182    /**
 183     * Query the type of elements in an array
 184     *
 185     * \return
 186     * Pointer to the type of elements in the array for array types, or \c NULL
 187     * for non-array types.
 188     */
 189    const glsl_type *element_type() const
 190    {
 191       return is_array() ? fields.array : NULL;
 192    }
 193
 194    /**
 195     * Get the instance of a built-in scalar, vector, or matrix type
 196     */
 197    static const glsl_type *get_instance(unsigned base_type, unsigned rows,
 198                                         unsigned columns);
 199
 200    /**
 201     * Get the instance of an array type
 202     */
 203    static const glsl_type *get_array_instance(const glsl_type *base,
 204                                               unsigned elements);
 205
 206    /**
 207     * Get the instance of a record type
 208     */
 209    static const glsl_type *get_record_instance(const glsl_struct_field *fields,
 210                                                unsigned num_fields,
 211                                                const char *name);
 212
 213    /**
 214     * Query the total number of scalars that make up a scalar, vector or matrix
 215     */
 216    unsigned components() const
 217    {
 218       return vector_elements * matrix_columns;
 219    }
 220
 221    /**
 222     * Calculate the number of components slots required to hold this type
 223     *
 224     * This is used to determine how many uniform or varying locations a type
 225     * might occupy.
 226     */
 227    unsigned component_slots() const;
 228
 229
 230    /**
 231     * Query whether or not a type is a scalar (non-vector and non-matrix).
 232     */
 233    bool is_scalar() const
 234    {
 235       return (vector_elements == 1)
 236          && (base_type >= GLSL_TYPE_UINT)
 237          && (base_type <= GLSL_TYPE_BOOL);
 238    }
 239
 240    /**
 241     * Query whether or not a type is a vector
 242     */
 243    bool is_vector() const
 244    {
 245       return (vector_elements > 1)
 246          && (matrix_columns == 1)
 247          && (base_type >= GLSL_TYPE_UINT)
 248          && (base_type <= GLSL_TYPE_BOOL);
 249    }
 250
 251    /**
 252     * Query whether or not a type is a matrix
 253     */
 254    bool is_matrix() const
 255    {
 256       /* GLSL only has float matrices. */
 257       return (matrix_columns > 1) && (base_type == GLSL_TYPE_FLOAT);
 258    }
 259
 260    /**
 261     * Query whether or not a type is a non-array numeric type
 262     */
 263    bool is_numeric() const
 264    {
 265       return (base_type >= GLSL_TYPE_UINT) && (base_type <= GLSL_TYPE_FLOAT);
 266    }
 267
 268    /**
 269     * Query whether or not a type is an integral type
 270     */
 271    bool is_integer() const
 272    {
 273       return (base_type == GLSL_TYPE_UINT) || (base_type == GLSL_TYPE_INT);
 274    }
 275
 276    /**
 277     * Query whether or not a type is a float type
 278     */
 279    bool is_float() const
 280    {
 281       return base_type == GLSL_TYPE_FLOAT;
 282    }
 283
 284    /**
 285     * Query whether or not a type is a non-array boolean type
 286     */
 287    bool is_boolean() const
 288    {
 289       return base_type == GLSL_TYPE_BOOL;
 290    }
 291
 292    /**
 293     * Query whether or not a type is a sampler
 294     */
 295    bool is_sampler() const
 296    {
 297       return base_type == GLSL_TYPE_SAMPLER;
 298    }
 299
 300    /**
 301     * Query whether or not a type is an array
 302     */
 303    bool is_array() const
 304    {
 305       return base_type == GLSL_TYPE_ARRAY;
 306    }
 307
 308    /**
 309     * Query whether or not a type is a record
 310     */
 311    bool is_record() const
 312    {
 313       return base_type == GLSL_TYPE_STRUCT;
 314    }
 315
 316    /**
 317     * Query whether or not a type is the void type singleton.
 318     */
 319    bool is_void() const
 320    {
 321       return base_type == GLSL_TYPE_VOID;
 322    }
 323
 324    /**
 325     * Query whether or not a type is the error type singleton.
 326     */
 327    bool is_error() const
 328    {
 329       return base_type == GLSL_TYPE_ERROR;
 330    }
 331
 332    /**
 333     * Query the full type of a matrix row
 334     *
 335     * \return
 336     * If the type is not a matrix, \c glsl_type::error_type is returned.
 337     * Otherwise a type matching the rows of the matrix is returned.
 338     */
 339    const glsl_type *row_type() const
 340    {
 341       return is_matrix()
 342          ? get_instance(base_type, matrix_columns, 1)
 343          : error_type;
 344    }
 345
 346    /**
 347     * Query the full type of a matrix column
 348     *
 349     * \return
 350     * If the type is not a matrix, \c glsl_type::error_type is returned.
 351     * Otherwise a type matching the columns of the matrix is returned.
 352     */
 353    const glsl_type *column_type() const
 354    {
 355       return is_matrix()
 356          ? get_instance(base_type, vector_elements, 1)
 357          : error_type;
 358    }
 359
 360
 361    /**
 362     * Get the type of a structure field
 363     *
 364     * \return
 365     * Pointer to the type of the named field.  If the type is not a structure
 366     * or the named field does not exist, \c glsl_type::error_type is returned.
 367     */
 368    const glsl_type *field_type(const char *name) const;
 369
 370
 371    /**
 372     * Get the location of a filed within a record type
 373     */
 374    int field_index(const char *name) const;
 375
 376
 377    /**
 378     * Query the number of elements in an array type
 379     *
 380     * \return
 381     * The number of elements in the array for array types or -1 for non-array
 382     * types.  If the number of elements in the array has not yet been declared,
 383     * zero is returned.
 384     */
 385    int array_size() const
 386    {
 387       return is_array() ? length : -1;
 388    }
 389
 390 private:
 391    /**
 392     * talloc context for all glsl_type allocations
 393     *
 394     * Set on the first call to \c glsl_type::new.
 395     */
 396    static void *mem_ctx;
 397
 398    void init_talloc_type_ctx(void);
 399
 400    /** Constructor for vector and matrix types */
 401    glsl_type(GLenum gl_type,
 402              unsigned base_type, unsigned vector_elements,
 403              unsigned matrix_columns, const char *name);
 404
 405    /** Constructor for sampler types */
 406    glsl_type(GLenum gl_type,
 407              enum glsl_sampler_dim dim, bool shadow, bool array,
 408              unsigned type, const char *name);
 409
 410    /** Constructor for record types */
 411    glsl_type(const glsl_struct_field *fields, unsigned num_fields,
 412              const char *name);
 413
 414    /** Constructor for array types */
 415    glsl_type(const glsl_type *array, unsigned length);
 416
 417    /** Hash table containing the known array types. */
 418    static struct hash_table *array_types;
 419
 420    /** Hash table containing the known record types. */
 421    static struct hash_table *record_types;
 422
 423    static int record_key_compare(const void *a, const void *b);
 424    static unsigned record_key_hash(const void *key);
 425
 426    /**
 427     * \name Pointers to various type singletons
 428     */
 429    /*@{*/
 430    static const glsl_type _error_type;
 431    static const glsl_type void_type;
 432    static const glsl_type builtin_core_types[];
 433    static const glsl_type builtin_structure_types[];
 434    static const glsl_type builtin_110_deprecated_structure_types[];
 435    static const glsl_type builtin_110_types[];
 436    static const glsl_type builtin_120_types[];
 437    static const glsl_type builtin_130_types[];
 438    static const glsl_type builtin_ARB_texture_rectangle_types[];
 439    static const glsl_type builtin_EXT_texture_array_types[];
 440    static const glsl_type builtin_EXT_texture_buffer_object_types[];
 441    /*@}*/
 442
 443    /**
 444     * \name Methods to populate a symbol table with built-in types.
 445     *
 446     * \internal
 447     * This is one of the truely annoying things about C++.  Methods that are
 448     * completely internal and private to a type still have to be advertised to
 449     * the world in a public header file.
 450     */
 451    /*@{*/
 452    static void generate_100ES_types(glsl_symbol_table *);
 453    static void generate_110_types(glsl_symbol_table *);
 454    static void generate_120_types(glsl_symbol_table *);
 455    static void generate_130_types(glsl_symbol_table *);
 456    static void generate_ARB_texture_rectangle_types(glsl_symbol_table *, bool);
 457    static void generate_EXT_texture_array_types(glsl_symbol_table *, bool);
 458    /*@}*/
 459
 460    /**
 461     * \name Friend functions.
 462     *
 463     * These functions are friends because they must have C linkage and the
 464     * need to call various private methods or access various private static
 465     * data.
 466     */
 467    /*@{*/
 468    friend void _mesa_glsl_initialize_types(struct _mesa_glsl_parse_state *);
 469    friend void _mesa_glsl_release_types(void);
 470    /*@}*/
 471 };
 472
 473 struct glsl_struct_field {
 474    const struct glsl_type *type;
 475    const char *name;
 476 };
 477
 478 #endif /* GLSL_TYPES_H */