| /* |
| * Mesa 3-D graphics library |
| * Version: 6.5 |
| * |
| * Copyright (C) 2005-2006 Brian Paul All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included |
| * in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
| * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #ifndef SLANG_STORAGE_H |
| #define SLANG_STORAGE_H |
| |
| #include "slang_compile.h" |
| #include "slang_typeinfo.h" |
| |
| |
| /* |
| * Program variable data storage is kept completely transparent to the |
| * front-end compiler. It is up to the back-end how the data is |
| * actually allocated. The slang_storage_type enum provides the basic |
| * information about how the memory is interpreted. This abstract |
| * piece of memory is called a data slot. A data slot of a particular |
| * type has a fixed size. |
| * |
| * For now, only the three basic types are supported, that is bool, |
| * int and float. Other built-in types like vector or matrix can |
| * easily be decomposed into a series of basic types. |
| * |
| * If the vec4 module is enabled, 4-component vectors of floats are |
| * used when possible. 4x4 matrices are constructed of 4 vec4 slots. |
| */ |
| typedef enum slang_storage_type_ |
| { |
| /* core */ |
| SLANG_STORE_AGGREGATE, |
| SLANG_STORE_BOOL, |
| SLANG_STORE_INT, |
| SLANG_STORE_FLOAT, |
| /* vec4 */ |
| SLANG_STORE_VEC4 |
| } slang_storage_type; |
| |
| |
| /** |
| * The slang_storage_array structure groups data slots of the same |
| * type into an array. This array has a fixed length. Arrays are |
| * required to have a size equal to the sum of sizes of its |
| * elements. They are also required to support indirect |
| * addressing. That is, if B references first data slot in the array, |
| * S is the size of the data slot and I is the integral index that is |
| * not known at compile time, B+I*S references I-th data slot. |
| * |
| * This structure is also used to break down built-in data types that |
| * are not supported directly. Vectors, like vec3, are constructed |
| * from arrays of their basic types. Matrices are formed of an array |
| * of column vectors, which are in turn processed as other vectors. |
| */ |
| typedef struct slang_storage_array_ |
| { |
| slang_storage_type type; |
| struct slang_storage_aggregate_ *aggregate; |
| GLuint length; |
| } slang_storage_array; |
| |
| GLboolean slang_storage_array_construct (slang_storage_array *); |
| GLvoid slang_storage_array_destruct (slang_storage_array *); |
| |
| |
| /** |
| * The slang_storage_aggregate structure relaxes the indirect |
| * addressing requirement for slang_storage_array |
| * structure. Aggregates are always accessed statically - its member |
| * addresses are well-known at compile time. For example, user-defined |
| * types are implemented as aggregates. Aggregates can collect data of |
| * a different type. |
| */ |
| typedef struct slang_storage_aggregate_ |
| { |
| slang_storage_array *arrays; |
| GLuint count; |
| } slang_storage_aggregate; |
| |
| GLboolean slang_storage_aggregate_construct (slang_storage_aggregate *); |
| GLvoid slang_storage_aggregate_destruct (slang_storage_aggregate *); |
| |
| |
| extern GLboolean |
| _slang_aggregate_variable(slang_storage_aggregate *agg, |
| slang_type_specifier *spec, |
| GLuint array_len, |
| slang_function_scope *funcs, |
| slang_struct_scope *structs, |
| slang_variable_scope *vars, |
| slang_atom_pool *atoms); |
| |
| /* |
| * Returns the size (in machine units) of the given storage type. |
| * It is an error to pass-in SLANG_STORE_AGGREGATE. |
| * Returns 0 on error. |
| */ |
| extern GLuint |
| _slang_sizeof_type (slang_storage_type); |
| |
| |
| /** |
| * Returns total size (in machine units) of the given aggregate. |
| * Returns 0 on error. |
| */ |
| extern GLuint |
| _slang_sizeof_aggregate (const slang_storage_aggregate *); |
| |
| |
| #if 0 |
| /** |
| * Converts structured aggregate to a flat one, with arrays of generic |
| * type being one-element long. Returns GL_TRUE on success. Returns |
| * GL_FALSE otherwise. |
| */ |
| extern GLboolean |
| _slang_flatten_aggregate (slang_storage_aggregate *, |
| const slang_storage_aggregate *); |
| |
| #endif |
| |
| #endif /* SLANG_STORAGE_H */ |