232 lines
10 KiB
C
232 lines
10 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/** \file
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* \ingroup blenloader
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*
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* This file contains an API that allows different parts of Blender to define what data is stored
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* in .blend files.
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*
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* Four callbacks have to be provided to fully implement .blend I/O for a piece of data. One of
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* those is related to file writing and three for file reading. Reading requires multiple
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* callbacks, due to the way linking between files works.
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*
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* Brief description of the individual callbacks:
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* - Blend Write: Define which structs and memory buffers are saved.
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* - Blend Read Data: Loads structs and memory buffers from file and updates pointers them.
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* - Blend Read Lib: Updates pointers to ID data blocks.
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* - Blend Expand: Defines which other data blocks should be loaded (possibly from other files).
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*
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* Each of these callbacks uses a different API functions.
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*
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* Some parts of Blender, e.g. modifiers, don't require you to implement all four callbacks.
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* Instead only the first two are necessary. The other two are handled by general ID management. In
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* the future, we might want to get rid of those two callbacks entirely, but for now they are
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* necessary.
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*/
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#pragma once
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/* for SDNA_TYPE_FROM_STRUCT() macro */
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#include "dna_type_offsets.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct BlendWriter BlendWriter;
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typedef struct BlendDataReader BlendDataReader;
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typedef struct BlendLibReader BlendLibReader;
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typedef struct BlendExpander BlendExpander;
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/* Blend Write API
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* ===============
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*
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* Most functions fall into one of two categories. Either they write a DNA struct or a raw memory
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* buffer to the .blend file.
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*
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* It is safe to pass NULL as data_ptr. In this case nothing will be stored.
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*
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* DNA Struct Writing
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* ------------------
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*
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* Functions dealing with DNA structs begin with BLO_write_struct_*.
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*
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* DNA struct types can be identified in different ways:
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* - Run-time Name: The name is provided as const char *.
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* - Compile-time Name: The name is provided at compile time. This is more efficient.
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* - Struct ID: Every DNA struct type has an integer ID that can be queried with
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* BLO_get_struct_id_by_name. Providing this ID can be a useful optimization when many structs
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* of the same type are stored AND if those structs are not in a continuous array.
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*
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* Often only a single instance of a struct is written at once. However, sometimes it is necessary
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* to write arrays or linked lists. Separate functions for that are provided as well.
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*
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* There is a special macro for writing id structs: BLO_write_id_struct. Those are handled
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* differently from other structs.
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*
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* Raw Data Writing
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* ----------------
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*
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* At the core there is BLO_write_raw, which can write arbitrary memory buffers to the file. The
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* code that reads this data might have to correct its byte-order. For the common cases there are
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* convenience functions that write and read arrays of simple types such as int32. Those will
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* correct endianness automatically.
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*/
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/* Mapping between names and ids. */
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int BLO_get_struct_id_by_name(BlendWriter *writer, const char *struct_name);
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#define BLO_get_struct_id(writer, struct_name) SDNA_TYPE_FROM_STRUCT(struct_name)
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/* Write single struct. */
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void BLO_write_struct_by_name(BlendWriter *writer, const char *struct_name, const void *data_ptr);
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void BLO_write_struct_by_id(BlendWriter *writer, int struct_id, const void *data_ptr);
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#define BLO_write_struct(writer, struct_name, data_ptr) \
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BLO_write_struct_by_id(writer, BLO_get_struct_id(writer, struct_name), data_ptr)
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/* Write single struct at address. */
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void BLO_write_struct_at_address_by_id(BlendWriter *writer,
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int struct_id,
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const void *address,
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const void *data_ptr);
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#define BLO_write_struct_at_address(writer, struct_name, address, data_ptr) \
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BLO_write_struct_at_address_by_id( \
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writer, BLO_get_struct_id(writer, struct_name), address, data_ptr)
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/* Write struct array. */
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void BLO_write_struct_array_by_name(BlendWriter *writer,
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const char *struct_name,
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int array_size,
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const void *data_ptr);
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void BLO_write_struct_array_by_id(BlendWriter *writer,
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int struct_id,
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int array_size,
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const void *data_ptr);
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#define BLO_write_struct_array(writer, struct_name, array_size, data_ptr) \
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BLO_write_struct_array_by_id( \
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writer, BLO_get_struct_id(writer, struct_name), array_size, data_ptr)
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/* Write struct array at address. */
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void BLO_write_struct_array_at_address_by_id(
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BlendWriter *writer, int struct_id, int array_size, const void *address, const void *data_ptr);
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#define BLO_write_struct_array_at_address(writer, struct_name, array_size, address, data_ptr) \
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BLO_write_struct_array_at_address_by_id( \
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writer, BLO_get_struct_id(writer, struct_name), array_size, address, data_ptr)
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/* Write struct list. */
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void BLO_write_struct_list_by_name(BlendWriter *writer,
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const char *struct_name,
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struct ListBase *list);
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void BLO_write_struct_list_by_id(BlendWriter *writer, int struct_id, struct ListBase *list);
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#define BLO_write_struct_list(writer, struct_name, list_ptr) \
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BLO_write_struct_list_by_id(writer, BLO_get_struct_id(writer, struct_name), list_ptr)
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/* Write id struct. */
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void blo_write_id_struct(BlendWriter *writer,
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int struct_id,
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const void *id_address,
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const struct ID *id);
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#define BLO_write_id_struct(writer, struct_name, id_address, id) \
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blo_write_id_struct(writer, BLO_get_struct_id(writer, struct_name), id_address, id)
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/* Write raw data. */
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void BLO_write_raw(BlendWriter *writer, size_t size_in_bytes, const void *data_ptr);
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void BLO_write_int32_array(BlendWriter *writer, uint num, const int32_t *data_ptr);
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void BLO_write_uint32_array(BlendWriter *writer, uint num, const uint32_t *data_ptr);
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void BLO_write_float_array(BlendWriter *writer, uint num, const float *data_ptr);
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void BLO_write_float3_array(BlendWriter *writer, uint num, const float *data_ptr);
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void BLO_write_pointer_array(BlendWriter *writer, uint num, const void *data_ptr);
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void BLO_write_string(BlendWriter *writer, const char *data_ptr);
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/* Misc. */
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bool BLO_write_is_undo(BlendWriter *writer);
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/* Blend Read Data API
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* ===================
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*
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* Generally, for every BLO_write_* call there should be a corresponding BLO_read_* call.
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*
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* Most BLO_read_* functions get a pointer to a pointer as argument. That allows the function to
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* update the pointer to its new value.
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*
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* When the given pointer points to a memory buffer that was not stored in the file, the pointer is
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* updated to be NULL. When it was pointing to NULL before, it will stay that way.
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*
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* Examples of matching calls:
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* BLO_write_struct(writer, ClothSimSettings, clmd->sim_parms);
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* BLO_read_data_address(reader, &clmd->sim_parms);
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*
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* BLO_write_struct_list(writer, TimeMarker, &action->markers);
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* BLO_read_list(reader, &action->markers);
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*
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* BLO_write_int32_array(writer, hmd->totindex, hmd->indexar);
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* BLO_read_int32_array(reader, hmd->totindex, &hmd->indexar);
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*/
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void *BLO_read_get_new_data_address(BlendDataReader *reader, const void *old_address);
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void *BLO_read_get_new_packed_address(BlendDataReader *reader, const void *old_address);
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#define BLO_read_data_address(reader, ptr_p) \
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*((void **)ptr_p) = BLO_read_get_new_data_address((reader), *(ptr_p))
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#define BLO_read_packed_address(reader, ptr_p) \
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*((void **)ptr_p) = BLO_read_get_new_packed_address((reader), *(ptr_p))
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typedef void (*BlendReadListFn)(BlendDataReader *reader, void *data);
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void BLO_read_list_cb(BlendDataReader *reader, struct ListBase *list, BlendReadListFn callback);
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void BLO_read_list(BlendDataReader *reader, struct ListBase *list);
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/* Update data pointers and correct byte-order if necessary. */
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void BLO_read_int32_array(BlendDataReader *reader, int array_size, int32_t **ptr_p);
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void BLO_read_uint32_array(BlendDataReader *reader, int array_size, uint32_t **ptr_p);
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void BLO_read_float_array(BlendDataReader *reader, int array_size, float **ptr_p);
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void BLO_read_float3_array(BlendDataReader *reader, int array_size, float **ptr_p);
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void BLO_read_double_array(BlendDataReader *reader, int array_size, double **ptr_p);
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void BLO_read_pointer_array(BlendDataReader *reader, void **ptr_p);
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/* Misc. */
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bool BLO_read_requires_endian_switch(BlendDataReader *reader);
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bool BLO_read_data_is_undo(BlendDataReader *reader);
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/* Blend Read Lib API
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* ===================
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*
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* This API does almost the same as the Blend Read Data API. However, now only pointers to ID data
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* blocks are updated.
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*/
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ID *BLO_read_get_new_id_address(BlendLibReader *reader, struct Library *lib, struct ID *id);
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#define BLO_read_id_address(reader, lib, id_ptr_p) \
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*((void **)id_ptr_p) = (void *)BLO_read_get_new_id_address((reader), (lib), (ID *)*(id_ptr_p))
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/* Misc. */
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bool BLO_read_lib_is_undo(BlendLibReader *reader);
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/* Blend Expand API
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* ===================
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*
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* BLO_expand has to be called for every data block that should be loaded. If the data block is in
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* a separate .blend file, it will be pulled from there.
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*/
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void BLO_expand_id(BlendExpander *expander, struct ID *id);
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#define BLO_expand(expander, id) BLO_expand_id(expander, (struct ID *)id)
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#ifdef __cplusplus
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}
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#endif
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