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 #define GLSL_TYPE_UINT          0
  33 #define GLSL_TYPE_INT           1
  34 #define GLSL_TYPE_FLOAT         2
  35 #define GLSL_TYPE_BOOL          3
  36 #define GLSL_TYPE_SAMPLER       4
  37 #define GLSL_TYPE_STRUCT        5
  38 #define GLSL_TYPE_ARRAY         6
  39 #define GLSL_TYPE_FUNCTION      7
  40 #define GLSL_TYPE_VOID          8
  41 #define GLSL_TYPE_ERROR         9
  42
  43 enum glsl_sampler_dim {
  44    GLSL_SAMPLER_DIM_1D = 0,
  45    GLSL_SAMPLER_DIM_2D,
  46    GLSL_SAMPLER_DIM_3D,
  47    GLSL_SAMPLER_DIM_CUBE,
  48    GLSL_SAMPLER_DIM_RECT,
  49    GLSL_SAMPLER_DIM_BUF
  50 };
  51
  52
  53 struct glsl_type {
  54    unsigned base_type:4;
  55
  56    unsigned sampler_dimensionality:3;
  57    unsigned sampler_shadow:1;
  58    unsigned sampler_array:1;
  59    unsigned sampler_type:2;    /**< Type of data returned using this sampler.
  60                                 * only \c GLSL_TYPE_FLOAT, \c GLSL_TYPE_INT,
  61                                 * and \c GLSL_TYPE_UINT are valid.
  62                                 */
  63
  64    /**
  65     * \name Vector and matrix element counts
  66     *
  67     * For scalars, each of these values will be 1.  For non-numeric types
  68     * these will be 0.
  69     */
  70    /*@{*/
  71    unsigned vector_elements:3; /**< 1, 2, 3, or 4 vector elements. */
  72    unsigned matrix_columns:3;  /**< 1, 2, 3, or 4 matrix columns. */
  73    /*@}*/
  74
  75    /**
  76     * Name of the data type
  77     *
  78     * This may be \c NULL for anonymous structures, for arrays, or for
  79     * function types.
  80     */
  81    const char *name;
  82
  83    /**
  84     * For \c GLSL_TYPE_ARRAY, this is the length of the array.  For
  85     * \c GLSL_TYPE_STRUCT, it is the number of elements in the structure and
  86     * the number of values pointed to by \c fields.structure (below).
  87     *
  88     * For \c GLSL_TYPE_FUNCTION, it is the number of parameters to the
  89     * function.  The return value from a function is implicitly the first
  90     * parameter.  The types of the parameters are stored in
  91     * \c fields.parameters (below).
  92     */
  93    unsigned length;
  94
  95    /**
  96     * Subtype of composite data types.
  97     */
  98    union {
  99       const struct glsl_type *array;            /**< Type of array elements. */
 100       const struct glsl_type *parameters;       /**< Parameters to function. */
 101       const struct glsl_struct_field *structure;/**< List of struct fields. */
 102    } fields;
 103
 104
 105    /**
 106     * \name Pointers to various public type singletons
 107     */
 108    /*@{*/
 109    static const glsl_type *const error_type;
 110    static const glsl_type *const int_type;
 111    static const glsl_type *const uint_type;
 112    static const glsl_type *const float_type;
 113    static const glsl_type *const bool_type;
 114    /*@}*/
 115
 116
 117    glsl_type(unsigned base_type, unsigned vector_elements,
 118              unsigned matrix_columns, const char *name) :
 119       base_type(base_type),
 120       sampler_dimensionality(0), sampler_shadow(0), sampler_array(0),
 121       sampler_type(0),
 122       vector_elements(vector_elements), matrix_columns(matrix_columns),
 123       name(name),
 124       length(0)
 125    {
 126       /* Neither dimension is zero or both dimensions are zero.
 127        */
 128       assert((vector_elements == 0) == (matrix_columns == 0));
 129       memset(& fields, 0, sizeof(fields));
 130    }
 131
 132    glsl_type(enum glsl_sampler_dim dim, bool shadow, bool array,
 133              unsigned type, const char *name) :
 134       base_type(GLSL_TYPE_SAMPLER),
 135       sampler_dimensionality(dim), sampler_shadow(shadow),
 136       sampler_array(array), sampler_type(type),
 137       vector_elements(0), matrix_columns(0),
 138       name(name),
 139       length(0)
 140    {
 141       memset(& fields, 0, sizeof(fields));
 142    }
 143
 144    glsl_type(const glsl_struct_field *fields, unsigned num_fields,
 145              const char *name) :
 146       base_type(GLSL_TYPE_STRUCT),
 147       sampler_dimensionality(0), sampler_shadow(0), sampler_array(0),
 148       sampler_type(0),
 149       vector_elements(0), matrix_columns(0),
 150       name(name),
 151       length(num_fields)
 152    {
 153       this->fields.structure = fields;
 154    }
 155
 156    /**
 157     * For numeric and boolean derrived types returns the basic scalar type
 158     *
 159     * If the type is a numeric or boolean scalar, vector, or matrix type,
 160     * this function gets the scalar type of the individual components.  For
 161     * all other types, including arrays of numeric or boolean types, the
 162     * error type is returned.
 163     */
 164    const glsl_type *get_base_type() const;
 165
 166    /**
 167     * Get the instance of a built-in scalar, vector, or matrix type
 168     */
 169    static const glsl_type *get_instance(unsigned base_type, unsigned rows,
 170                                         unsigned columns);
 171
 172    /**
 173     * Query the total number of scalars that make up a scalar, vector or matrix
 174     */
 175    unsigned components() const
 176    {
 177       return vector_elements * matrix_columns;
 178    }
 179
 180    /**
 181     * Query whether or not a type is a scalar (non-vector and non-matrix).
 182     */
 183    bool is_scalar() const
 184    {
 185       return (vector_elements == 1)
 186          && (base_type >= GLSL_TYPE_UINT)
 187          && (base_type <= GLSL_TYPE_BOOL);
 188    }
 189
 190    /**
 191     * Query whether or not a type is a vector
 192     */
 193    bool is_vector() const
 194    {
 195       return (vector_elements > 1)
 196          && (matrix_columns == 1)
 197          && (base_type >= GLSL_TYPE_UINT)
 198          && (base_type <= GLSL_TYPE_BOOL);
 199    }
 200
 201    /**
 202     * Query whether or not a type is a matrix
 203     */
 204    bool is_matrix() const
 205    {
 206       /* GLSL only has float matrices. */
 207       return (matrix_columns > 1) && (base_type == GLSL_TYPE_FLOAT);
 208    }
 209
 210    /**
 211     * Query whether or not a type is a non-array numeric type
 212     */
 213    bool is_numeric() const
 214    {
 215       return (base_type >= GLSL_TYPE_UINT) && (base_type <= GLSL_TYPE_FLOAT);
 216    }
 217
 218    /**
 219     * Query whether or not a type is an integral type
 220     */
 221    bool is_integer() const
 222    {
 223       return (base_type == GLSL_TYPE_UINT) || (base_type == GLSL_TYPE_INT);
 224    }
 225
 226    /**
 227     * Query whether or not a type is a non-array boolean type
 228     */
 229    bool is_boolean() const
 230    {
 231       return base_type == GLSL_TYPE_BOOL;
 232    }
 233
 234    /**
 235     * Query whether or not a type is a sampler
 236     */
 237    bool is_sampler() const
 238    {
 239       return base_type == GLSL_TYPE_SAMPLER;
 240    }
 241
 242    /**
 243     * Query whether or not a type is the void type singleton.
 244     */
 245    bool is_void() const
 246    {
 247       return base_type == GLSL_TYPE_VOID;
 248    }
 249
 250    /**
 251     * Query whether or not a type is the error type singleton.
 252     */
 253    bool is_error() const
 254    {
 255       return base_type == GLSL_TYPE_ERROR;
 256    }
 257
 258    /**
 259     * Query the full type of a matrix row
 260     *
 261     * \return
 262     * If the type is not a matrix, \c glsl_type::error_type is returned.
 263     * Otherwise a type matching the rows of the matrix is returned.
 264     */
 265    const glsl_type *row_type() const
 266    {
 267       return is_matrix()
 268          ? get_instance(base_type, matrix_columns, 1)
 269          : error_type;
 270    }
 271
 272    /**
 273     * Query the full type of a matrix column
 274     *
 275     * \return
 276     * If the type is not a matrix, \c glsl_type::error_type is returned.
 277     * Otherwise a type matching the columns of the matrix is returned.
 278     */
 279    const glsl_type *column_type() const
 280    {
 281       return is_matrix()
 282          ? get_instance(base_type, vector_elements, 1)
 283          : error_type;
 284    }
 285
 286 private:
 287    /**
 288     * \name Pointers to various private type singletons
 289     */
 290    /*@{*/
 291    static const glsl_type *const mat2_type;
 292    static const glsl_type *const mat2x3_type;
 293    static const glsl_type *const mat2x4_type;
 294    static const glsl_type *const mat3x2_type;
 295    static const glsl_type *const mat3_type;
 296    static const glsl_type *const mat3x4_type;
 297    static const glsl_type *const mat4x2_type;
 298    static const glsl_type *const mat4x3_type;
 299    static const glsl_type *const mat4_type;
 300    /*@}*/
 301 };
 302
 303 struct glsl_struct_field {
 304    const struct glsl_type *type;
 305    const char *name;
 306 };
 307
 308 struct _mesa_glsl_parse_state;
 309
 310 #ifdef __cplusplus
 311 extern "C" {
 312 #endif
 313
 314 extern void
 315 _mesa_glsl_initialize_types(struct _mesa_glsl_parse_state *state);
 316
 317 extern void
 318 _mesa_glsl_initialize_constructors(struct exec_list *instructions,
 319                                    struct _mesa_glsl_parse_state *state);
 320
 321 #ifdef __cplusplus
 322 }
 323 #endif
 324
 325 #endif /* GLSL_TYPES_H */