blender-archive/source/blender/depsgraph/DEG_depsgraph_query.h

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2013 Blender Foundation.
 * All rights reserved.
 */

/** \file
 * \ingroup depsgraph
 *
 * Public API for Querying and Filtering Depsgraph.
 */

#ifndef __DEG_DEPSGRAPH_QUERY_H__
#define __DEG_DEPSGRAPH_QUERY_H__

#include "DEG_depsgraph.h"
#include "DEG_depsgraph_build.h"

struct ID;

struct BLI_Iterator;
struct Base;
struct CustomData_MeshMasks;
struct Depsgraph;
struct DupliObject;
struct ListBase;
struct Scene;
struct ViewLayer;

#ifdef __cplusplus
extern "C" {
#endif

/* *********************** DEG input data ********************* */

/* Get scene that depsgraph was built for. */
struct Scene *DEG_get_input_scene(const Depsgraph *graph);

/* Get view layer that depsgraph was built for. */
struct ViewLayer *DEG_get_input_view_layer(const Depsgraph *graph);

/* Get evaluation mode that depsgraph was built for. */
eEvaluationMode DEG_get_mode(const Depsgraph *graph);

/* Get time that depsgraph is being evaluated or was last evaluated at. */
float DEG_get_ctime(const Depsgraph *graph);

/* ********************* DEG evaluated data ******************* */

/* Check if given ID type was tagged for update. */
bool DEG_id_type_updated(const struct Depsgraph *depsgraph, short id_type);
bool DEG_id_type_any_updated(const struct Depsgraph *depsgraph);

/* Get additional evaluation flags for the given ID. */
uint32_t DEG_get_eval_flags_for_id(const struct Depsgraph *graph, struct ID *id);

/* Get additional mesh CustomData_MeshMasks flags for the given object. */
void DEG_get_customdata_mask_for_object(const struct Depsgraph *graph,
                                        struct Object *object,
                                        struct CustomData_MeshMasks *r_mask);

/* Get scene the despgraph is created for. */
struct Scene *DEG_get_evaluated_scene(const struct Depsgraph *graph);

/* Get scene layer the despgraph is created for. */
struct ViewLayer *DEG_get_evaluated_view_layer(const struct Depsgraph *graph);

/* Get evaluated version of object for given original one. */
struct Object *DEG_get_evaluated_object(const struct Depsgraph *depsgraph,
                                        struct Object *object);

/* Get evaluated version of given ID datablock. */
struct ID *DEG_get_evaluated_id(const struct Depsgraph *depsgraph,
                                struct ID *id);

/* Get evaluated version of data pointed to by RNA pointer */
void DEG_get_evaluated_rna_pointer(const struct Depsgraph *depsgraph,
                                   struct PointerRNA *ptr,
                                   struct PointerRNA *r_ptr_eval);

/* Get original version of object for given evaluated one. */
struct Object *DEG_get_original_object(struct Object *object);

/* Get original version of given evaluated ID datablock. */
struct ID *DEG_get_original_id(struct ID *id);

/* ************************ DEG object iterators ********************* */

enum {
	DEG_ITER_OBJECT_FLAG_LINKED_DIRECTLY   = (1 << 0),
	DEG_ITER_OBJECT_FLAG_LINKED_INDIRECTLY = (1 << 1),
	DEG_ITER_OBJECT_FLAG_LINKED_VIA_SET    = (1 << 2),
	DEG_ITER_OBJECT_FLAG_VISIBLE           = (1 << 3),
	DEG_ITER_OBJECT_FLAG_DUPLI             = (1 << 4),
};

typedef struct DEGObjectIterData {
	struct Depsgraph *graph;
	int flag;

	struct Scene *scene;

	eEvaluationMode eval_mode;

	/* **** Iteration over dupli-list. *** */

	/* Object which created the dupli-list. */
	struct Object *dupli_parent;
	/* List of duplicated objects. */
	struct ListBase *dupli_list;
	/* Next duplicated object to step into. */
	struct DupliObject *dupli_object_next;
	/* Corresponds to current object: current iterator object is evaluated from
	 * this duplicated object. */
	struct DupliObject *dupli_object_current;
	/* Temporary storage to report fully populated DNA to the render engine or
	 * other users of the iterator. */
	struct Object temp_dupli_object;

	/* **** Iteration over ID nodes **** */
	size_t id_node_index;
	size_t num_id_nodes;
} DEGObjectIterData;

void DEG_iterator_objects_begin(struct BLI_Iterator *iter, DEGObjectIterData *data);
void DEG_iterator_objects_next(struct BLI_Iterator *iter);
void DEG_iterator_objects_end(struct BLI_Iterator *iter);

/**
 * Note: Be careful with DEG_ITER_OBJECT_FLAG_LINKED_INDIRECTLY objects.
 * Although they are available they have no overrides (collection_properties)
 * and will crash if you try to access it.
 */
#define DEG_OBJECT_ITER_BEGIN(graph_, instance_, flag_)                           \
	{                                                                             \
		DEGObjectIterData data_ = {                                               \
			graph_,                                                               \
			flag_,                                                                \
		};                                                                        \
                                                                                  \
		ITER_BEGIN(DEG_iterator_objects_begin,                                    \
		           DEG_iterator_objects_next,                                     \
		           DEG_iterator_objects_end,                                      \
		           &data_, Object *, instance_)

#define DEG_OBJECT_ITER_END                                                       \
		ITER_END;                                                                 \
	}

/**
 * Depsgraph objects iterator for draw manager and final render
 */
#define DEG_OBJECT_ITER_FOR_RENDER_ENGINE_BEGIN(graph_, instance_)        \
	DEG_OBJECT_ITER_BEGIN(graph_, instance_,                              \
	        DEG_ITER_OBJECT_FLAG_LINKED_DIRECTLY |                        \
	        DEG_ITER_OBJECT_FLAG_LINKED_VIA_SET |                         \
	        DEG_ITER_OBJECT_FLAG_VISIBLE |                                \
	        DEG_ITER_OBJECT_FLAG_DUPLI)

#define DEG_OBJECT_ITER_FOR_RENDER_ENGINE_END                             \
	DEG_OBJECT_ITER_END


/* ************************ DEG ID iterators ********************* */

typedef struct DEGIDIterData {
	struct Depsgraph *graph;
	bool only_updated;

	size_t id_node_index;
	size_t num_id_nodes;
} DEGIDIterData;

void DEG_iterator_ids_begin(struct BLI_Iterator *iter, DEGIDIterData *data);
void DEG_iterator_ids_next(struct BLI_Iterator *iter);
void DEG_iterator_ids_end(struct BLI_Iterator *iter);

/* ************************ DEG traversal ********************* */

typedef void (*DEGForeachIDCallback)(ID *id, void *user_data);

/* NOTE: Modifies runtime flags in depsgraph nodes, so can not be used in
 * parallel. Keep an eye on that!
 */
void DEG_foreach_ancestor_ID(const Depsgraph *depsgraph,
                             const ID *id,
                             DEGForeachIDCallback callback, void *user_data);
void DEG_foreach_dependent_ID(const Depsgraph *depsgraph,
                              const ID *id,
                              DEGForeachIDCallback callback, void *user_data);

void DEG_foreach_ID(const Depsgraph *depsgraph,
                    DEGForeachIDCallback callback, void *user_data);

/* ********************* DEG graph filtering ****************** */

/* ComponentKey for nodes we want to be able to evaluate in the filtered graph */
typedef struct DEG_FilterTarget {
	struct DEG_FilterTarget *next, *prev;

	struct ID *id;
	/* TODO: component identifiers - Component Type, Subdata/Component Name */
} DEG_FilterTarget;

typedef enum eDEG_FilterQuery_Granularity {
	DEG_FILTER_NODES_ALL           = 0,
	DEG_FILTER_NODES_NO_OPS        = 1,
	DEG_FILTER_NODES_ID_ONLY       = 2,
} eDEG_FilterQuery_Granularity;


typedef struct DEG_FilterQuery {
	/* List of DEG_FilterTarget's */
	struct ListBase targets;

	/* Level of detail in the resulting graph */
	eDEG_FilterQuery_Granularity detail_level;
} DEG_FilterQuery;

/* Obtain a new graph instance that only contains the subset of desired nodes
 * WARNING: Do NOT pass an already filtered depsgraph through this function again,
 *          as we are currently unable to accurately recreate it.
 */
Depsgraph *DEG_graph_filter(const Depsgraph *depsgraph, struct Main *bmain, DEG_FilterQuery *query);


#ifdef __cplusplus
} /* extern "C" */
#endif

#endif  /* __DEG_DEPSGRAPH_QUERY_H__ */