blender-archive/source/blender/blenkernel/intern/node.c

/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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) 2005 Blender Foundation.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): Bob Holcomb.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/blenkernel/intern/node.c
 *  \ingroup bke
 */

#include "MEM_guardedalloc.h"

#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <limits.h>

#include "DNA_action_types.h"
#include "DNA_anim_types.h"
#include "DNA_node_types.h"
#include "DNA_node_types.h"
#include "DNA_scene_types.h"

#include "BLI_string.h"
#include "BLI_math.h"
#include "BLI_listbase.h"
#include "BLI_path_util.h"
#include "BLI_utildefines.h"

#include "BLF_translation.h"

#include "BKE_animsys.h"
#include "BKE_action.h"
#include "BKE_fcurve.h"
#include "BKE_global.h"
#include "BKE_image.h"
#include "BKE_library.h"
#include "BKE_main.h"
#include "BKE_node.h"

#include "RNA_access.h"

#include "NOD_socket.h"
#include "NOD_composite.h"
#include "NOD_shader.h"
#include "NOD_texture.h"


bNodeTreeType *ntreeGetType(int type)
{
	static bNodeTreeType *types[NUM_NTREE_TYPES];
	static int types_init = 1;
	if (types_init) {
		types[NTREE_SHADER] = &ntreeType_Shader;
		types[NTREE_COMPOSIT] = &ntreeType_Composite;
		types[NTREE_TEXTURE] = &ntreeType_Texture;
		types_init = 0;
	}
	
	if (type >= 0 && type < NUM_NTREE_TYPES) {
		return types[type];
	}
	else {
		return NULL;
	}
}

static bNodeType *node_get_type(bNodeTree *ntree, int type)
{
	bNodeType *ntype = ntreeGetType(ntree->type)->node_types.first;
	for (; ntype; ntype = ntype->next)
		if (ntype->type == type)
			return ntype;
	
	return NULL;
}

bNodeType *ntreeGetNodeType(bNodeTree *ntree)
{
	return node_get_type(ntree, ntree->nodetype);
}

bNodeSocketType *ntreeGetSocketType(int type)
{
	static bNodeSocketType *types[NUM_SOCKET_TYPES] = {NULL};
	static int types_init = 1;

	if (types_init) {
		node_socket_type_init(types);
		types_init = 0;
	}

	if (type < NUM_SOCKET_TYPES) {
		return types[type];
	}
	else {
		return NULL;
	}
}

void ntreeInitTypes(bNodeTree *ntree)
{
	bNode *node, *next;
	
	for (node = ntree->nodes.first; node; node = next) {
		next = node->next;
		
		node->typeinfo = node_get_type(ntree, node->type);

		if (node->typeinfo == NULL) {
			printf("Error: Node type %s doesn't exist anymore, removed\n", node->name);
			nodeFreeNode(ntree, node);
		}
	}
			
	ntree->init |= NTREE_TYPE_INIT;
}

static bNodeSocket *make_socket(bNodeTree *UNUSED(ntree), int in_out, const char *name, int type)
{
	bNodeSocket *sock;
	
	sock = MEM_callocN(sizeof(bNodeSocket), "sock");
	
	BLI_strncpy(sock->name, name, NODE_MAXSTR);
	sock->limit = (in_out == SOCK_IN ? 1 : 0xFFF);
	sock->type = type;
	sock->storage = NULL;
	
	sock->default_value = node_socket_make_default_value(type);
	node_socket_init_default_value(type, sock->default_value);
	
	return sock;
}

bNodeSocket *nodeAddSocket(bNodeTree *ntree, bNode *node, int in_out, const char *name, int type)
{
	bNodeSocket *sock = make_socket(ntree, in_out, name, type);
	if (in_out == SOCK_IN)
		BLI_addtail(&node->inputs, sock);
	else if (in_out == SOCK_OUT)
		BLI_addtail(&node->outputs, sock);
	
	node->update |= NODE_UPDATE;
	
	return sock;
}

bNodeSocket *nodeInsertSocket(bNodeTree *ntree, bNode *node, int in_out, bNodeSocket *next_sock, const char *name, int type)
{
	bNodeSocket *sock = make_socket(ntree, in_out, name, type);
	if (in_out == SOCK_IN)
		BLI_insertlinkbefore(&node->inputs, next_sock, sock);
	else if (in_out == SOCK_OUT)
		BLI_insertlinkbefore(&node->outputs, next_sock, sock);
	
	node->update |= NODE_UPDATE;
	
	return sock;
}

void nodeRemoveSocket(bNodeTree *ntree, bNode *node, bNodeSocket *sock)
{
	bNodeLink *link, *next;
	
	for (link = ntree->links.first; link; link = next) {
		next = link->next;
		if (link->fromsock == sock || link->tosock == sock) {
			nodeRemLink(ntree, link);
		}
	}
	
	/* this is fast, this way we don't need an in_out argument */
	BLI_remlink(&node->inputs, sock);
	BLI_remlink(&node->outputs, sock);
	
	node_socket_free_default_value(sock->type, sock->default_value);
	MEM_freeN(sock);
	
	node->update |= NODE_UPDATE;
}

void nodeRemoveAllSockets(bNodeTree *ntree, bNode *node)
{
	bNodeSocket *sock;
	bNodeLink *link, *next;
	
	for (link = ntree->links.first; link; link = next) {
		next = link->next;
		if (link->fromnode == node || link->tonode == node) {
			nodeRemLink(ntree, link);
		}
	}
	
	for (sock = node->inputs.first; sock; sock = sock->next)
		node_socket_free_default_value(sock->type, sock->default_value);
	BLI_freelistN(&node->inputs);
	for (sock = node->outputs.first; sock; sock = sock->next)
		node_socket_free_default_value(sock->type, sock->default_value);
	BLI_freelistN(&node->outputs);
	
	node->update |= NODE_UPDATE;
}

/* finds a node based on its name */
bNode *nodeFindNodebyName(bNodeTree *ntree, const char *name)
{
	return BLI_findstring(&ntree->nodes, name, offsetof(bNode, name));
}

/* finds a node based on given socket */
int nodeFindNode(bNodeTree *ntree, bNodeSocket *sock, bNode **nodep, int *sockindex, int *in_out)
{
	bNode *node;
	bNodeSocket *tsock;
	int index = 0;
	
	for (node = ntree->nodes.first; node; node = node->next) {
		for (index = 0, tsock = node->inputs.first; tsock; tsock = tsock->next, index++) {
			if (tsock == sock) {
				if (in_out) *in_out = SOCK_IN;
				break;
			}
		}
		if (tsock)
			break;
		for (index = 0, tsock = node->outputs.first; tsock; tsock = tsock->next, index++) {
			if (tsock == sock) {
				if (in_out) *in_out = SOCK_OUT;
				break;
			}
		}
		if (tsock)
			break;
	}

	if (node) {
		*nodep = node;
		if (sockindex) *sockindex = index;
		return 1;
	}
	
	*nodep = NULL;
	return 0;
}

/* ************** Add stuff ********** */
static void node_add_sockets_from_type(bNodeTree *ntree, bNode *node, bNodeType *ntype)
{
	bNodeSocketTemplate *sockdef;
	/* bNodeSocket *sock; */ /* UNUSED */

	if (ntype->inputs) {
		sockdef = ntype->inputs;
		while (sockdef->type != -1) {
			/* sock = */ node_add_input_from_template(ntree, node, sockdef);
			
			sockdef++;
		}
	}
	if (ntype->outputs) {
		sockdef = ntype->outputs;
		while (sockdef->type != -1) {
			/* sock = */ node_add_output_from_template(ntree, node, sockdef);
			
			sockdef++;
		}
	}
}

/* Find the first available, non-duplicate name for a given node */
void nodeUniqueName(bNodeTree *ntree, bNode *node)
{
	BLI_uniquename(&ntree->nodes, node, "Node", '.', offsetof(bNode, name), sizeof(node->name));
}

bNode *nodeAddNode(bNodeTree *ntree, struct bNodeTemplate *ntemp)
{
	bNode *node;
	bNodeType *ntype;
	
	ntype = node_get_type(ntree, ntemp->type);
	if (ntype == NULL) {
		printf("nodeAddNodeType() error: '%d' type invalid\n", ntemp->type);
		return NULL;
	}
	/* validity check */
	if (!nodeValid(ntree, ntemp))
		return NULL;
	
	node = MEM_callocN(sizeof(bNode), "new node");
	node->type = ntype->type;
	node->typeinfo = ntype;
	node->flag = NODE_SELECT | ntype->flag;
	node->width = ntype->width;
	node->miniwidth = 42.0f;
	node->height = ntype->height;
	node->color[0] = node->color[1] = node->color[2] = 0.608;   /* default theme color */
	
	node_add_sockets_from_type(ntree, node, ntype);

	BLI_addtail(&ntree->nodes, node);
	
	if (ntype->initfunc != NULL)
		ntype->initfunc(ntree, node, ntemp);

	/* initialize the node name with the node label.
	 * note: do this after the initfunc so nodes get their data set which may be used in naming
	 * (node groups for example) */
	/* XXX Do not use nodeLabel() here, it returns translated content, which should *only* be used
	 *     in UI, *never* in data...
	 *     This solution may be a bit rougher than nodeLabel()'s returned string, but it's simpler
	 *     than adding a "no translate" flag to this func (and labelfunc() as well). */
	BLI_strncpy(node->name, node->typeinfo->name, NODE_MAXSTR);
	nodeUniqueName(ntree, node);
	
	ntree->update |= NTREE_UPDATE_NODES;
	
	return node;
}

/* keep socket listorder identical, for copying links */
/* ntree is the target tree */
bNode *nodeCopyNode(struct bNodeTree *ntree, struct bNode *node)
{
	bNode *nnode = MEM_callocN(sizeof(bNode), "dupli node");
	bNodeSocket *sock, *oldsock;

	*nnode = *node;
	/* can be called for nodes outside a node tree (e.g. clipboard) */
	if (ntree) {
		nodeUniqueName(ntree, nnode);

		BLI_addtail(&ntree->nodes, nnode);
	}

	BLI_duplicatelist(&nnode->inputs, &node->inputs);
	oldsock = node->inputs.first;
	for (sock = nnode->inputs.first; sock; sock = sock->next, oldsock = oldsock->next) {
		oldsock->new_sock = sock;
		sock->stack_index = 0;
		
		sock->default_value = node_socket_make_default_value(oldsock->type);
		node_socket_copy_default_value(oldsock->type, sock->default_value, oldsock->default_value);
		
		/* XXX some compositor node (e.g. image, render layers) still store
		 * some persistent buffer data here, need to clear this to avoid dangling pointers.
		 */
		sock->cache = NULL;
	}
	
	BLI_duplicatelist(&nnode->outputs, &node->outputs);
	oldsock = node->outputs.first;
	for (sock = nnode->outputs.first; sock; sock = sock->next, oldsock = oldsock->next) {
		oldsock->new_sock = sock;
		sock->stack_index = 0;
		
		sock->default_value = node_socket_make_default_value(oldsock->type);
		node_socket_copy_default_value(oldsock->type, sock->default_value, oldsock->default_value);
		
		/* XXX some compositor node (e.g. image, render layers) still store
		 * some persistent buffer data here, need to clear this to avoid dangling pointers.
		 */
		sock->cache = NULL;
	}
	
	/* don't increase node->id users, freenode doesn't decrement either */
	
	if (node->typeinfo->copystoragefunc)
		node->typeinfo->copystoragefunc(node, nnode);
	
	node->new_node = nnode;
	nnode->new_node = NULL;
	nnode->preview = NULL;
	
	if (ntree)
		ntree->update |= NTREE_UPDATE_NODES;
	
	return nnode;
}

/* also used via rna api, so we check for proper input output direction */
bNodeLink *nodeAddLink(bNodeTree *ntree, bNode *fromnode, bNodeSocket *fromsock, bNode *tonode, bNodeSocket *tosock)
{
	bNodeSocket *sock;
	bNodeLink *link = NULL;
	int from = 0, to = 0;
	
	if (fromnode) {
		/* test valid input */
		for (sock = fromnode->outputs.first; sock; sock = sock->next)
			if (sock == fromsock)
				break;
		if (sock)
			from = 1;  /* OK */
		else {
			for (sock = fromnode->inputs.first; sock; sock = sock->next)
				if (sock == fromsock)
					break;
			if (sock)
				from = -1;  /* OK but flip */
		}
	}
	else if (ntree) {
		/* check tree sockets */
		for (sock = ntree->inputs.first; sock; sock = sock->next)
			if (sock == fromsock)
				break;
		if (sock)
			from = 1;  /* OK */
		else {
			for (sock = ntree->outputs.first; sock; sock = sock->next)
				if (sock == fromsock)
					break;
			if (sock)
				from = -1;  /* OK but flip */
		}
	}
	if (tonode) {
		for (sock = tonode->inputs.first; sock; sock = sock->next)
			if (sock == tosock)
				break;
		if (sock)
			to = 1;  /* OK */
		else {
			for (sock = tonode->outputs.first; sock; sock = sock->next)
				if (sock == tosock)
					break;
			if (sock)
				to = -1;  /* OK but flip */
		}
	}
	else if (ntree) {
		/* check tree sockets */
		for (sock = ntree->outputs.first; sock; sock = sock->next)
			if (sock == tosock)
				break;
		if (sock)
			to = 1;  /* OK */
		else {
			for (sock = ntree->inputs.first; sock; sock = sock->next)
				if (sock == tosock)
					break;
			if (sock)
				to = -1;  /* OK but flip */
		}
	}
	
	if (from >= 0 && to >= 0) {
		link = MEM_callocN(sizeof(bNodeLink), "link");
		if (ntree)
			BLI_addtail(&ntree->links, link);
		link->fromnode = fromnode;
		link->fromsock = fromsock;
		link->tonode = tonode;
		link->tosock = tosock;
	}
	else if (from <= 0 && to <= 0) {
		link = MEM_callocN(sizeof(bNodeLink), "link");
		if (ntree)
			BLI_addtail(&ntree->links, link);
		link->fromnode = tonode;
		link->fromsock = tosock;
		link->tonode = fromnode;
		link->tosock = fromsock;
	}
	
	if (ntree)
		ntree->update |= NTREE_UPDATE_LINKS;
	
	return link;
}

void nodeRemLink(bNodeTree *ntree, bNodeLink *link)
{
	/* can be called for links outside a node tree (e.g. clipboard) */
	if (ntree)
		BLI_remlink(&ntree->links, link);

	if (link->tosock)
		link->tosock->link = NULL;
	MEM_freeN(link);
	
	if (ntree)
		ntree->update |= NTREE_UPDATE_LINKS;
}

void nodeRemSocketLinks(bNodeTree *ntree, bNodeSocket *sock)
{
	bNodeLink *link, *next;
	
	for (link = ntree->links.first; link; link = next) {
		next = link->next;
		if (link->fromsock == sock || link->tosock == sock) {
			nodeRemLink(ntree, link);
		}
	}
	
	ntree->update |= NTREE_UPDATE_LINKS;
}

void nodeInternalRelink(bNodeTree *ntree, bNode *node)
{
	bNodeLink *link, *link_next;
	ListBase intlinks;
	
	if (!node->typeinfo->internal_connect)
		return;
	
	intlinks = node->typeinfo->internal_connect(ntree, node);
	
	/* store link pointers in output sockets, for efficient lookup */
	for (link = intlinks.first; link; link = link->next)
		link->tosock->link = link;
	
	/* redirect downstream links */
	for (link = ntree->links.first; link; link = link_next) {
		link_next = link->next;
		
		/* do we have internal link? */
		if (link->fromnode == node) {
			if (link->fromsock->link) {
				/* get the upstream input link */
				bNodeLink *fromlink = link->fromsock->link->fromsock->link;
				/* skip the node */
				if (fromlink) {
					link->fromnode = fromlink->fromnode;
					link->fromsock = fromlink->fromsock;
					
					ntree->update |= NTREE_UPDATE_LINKS;
				}
				else
					nodeRemLink(ntree, link);
			}
			else
				nodeRemLink(ntree, link);
		}
	}
	
	/* remove remaining upstream links */
	for (link = ntree->links.first; link; link = link_next) {
		link_next = link->next;
		
		if (link->tonode == node)
			nodeRemLink(ntree, link);
	}
	
	BLI_freelistN(&intlinks);
}

void nodeToView(bNode *node, float x, float y, float *rx, float *ry)
{
	if (node->parent) {
		nodeToView(node->parent, x + node->locx, y + node->locy, rx, ry);
	}
	else {
		*rx = x + node->locx;
		*ry = y + node->locy;
	}
}

void nodeFromView(bNode *node, float x, float y, float *rx, float *ry)
{
	if (node->parent) {
		nodeFromView(node->parent, x, y, rx, ry);
		*rx -= node->locx;
		*ry -= node->locy;
	}
	else {
		*rx = x - node->locx;
		*ry = y - node->locy;
	}
}

int nodeAttachNodeCheck(bNode *node, bNode *parent)
{
	bNode *parent_recurse;
	for (parent_recurse = node; parent_recurse; parent_recurse = parent_recurse->parent) {
		if (parent_recurse == parent) {
			return TRUE;
		}
	}

	return FALSE;
}

void nodeAttachNode(bNode *node, bNode *parent)
{
	float locx, locy;

	BLI_assert(parent->type == NODE_FRAME);
	BLI_assert(nodeAttachNodeCheck(parent, node) == FALSE);

	nodeToView(node, 0.0f, 0.0f, &locx, &locy);
	
	node->parent = parent;
	/* transform to parent space */
	nodeFromView(parent, locx, locy, &node->locx, &node->locy);
}

void nodeDetachNode(struct bNode *node)
{
	float locx, locy;
	
	if (node->parent) {

		BLI_assert(node->parent->type == NODE_FRAME);

		/* transform to view space */
		nodeToView(node, 0.0f, 0.0f, &locx, &locy);
		node->locx = locx;
		node->locy = locy;
		node->parent = NULL;
	}
}

bNodeTree *ntreeAddTree(const char *name, int type, int nodetype)
{
	bNodeTree *ntree;
	bNodeType *ntype;
	
	/* trees are created as local trees if they of compositor, material or texture type,
	 * node groups and other tree types are created as library data.
	 */
	if (ELEM3(type, NTREE_COMPOSIT, NTREE_SHADER, NTREE_TEXTURE) && nodetype == 0) {
		ntree = MEM_callocN(sizeof(bNodeTree), "new node tree");
		*( (short *)ntree->id.name) = ID_NT; /* not "type", as that is ntree->type */
		BLI_strncpy(ntree->id.name + 2, name, sizeof(ntree->id.name));
	}
	else
		ntree = BKE_libblock_alloc(&G.main->nodetree, ID_NT, name);
	
	ntree->type = type;
	ntree->nodetype = nodetype;
	
	ntreeInitTypes(ntree);
	
	ntype = node_get_type(ntree, ntree->nodetype);
	if (ntype && ntype->inittreefunc)
		ntype->inittreefunc(ntree);
	
	return ntree;
}

/* Warning: this function gets called during some rather unexpected times
 *	- this gets called when executing compositing updates (for threaded previews)
 *	- when the nodetree datablock needs to be copied (i.e. when users get copied)
 *	- for scene duplication use ntreeSwapID() after so we don't have stale pointers.
 *
 * do_make_extern: keep enabled for general use, only reason _not_ to enable is when
 * copying for internal use (threads for eg), where you wont want it to modify the
 * scene data.
 */
static bNodeTree *ntreeCopyTree_internal(bNodeTree *ntree, const short do_id_user, const short do_make_extern)
{
	bNodeTree *newtree;
	bNode *node /*, *nnode */ /* UNUSED */, *last;
	bNodeLink *link;
	bNodeSocket *gsock, *oldgsock;
	
	if (ntree == NULL) return NULL;
	
	/* is ntree part of library? */
	for (newtree = G.main->nodetree.first; newtree; newtree = newtree->id.next)
		if (newtree == ntree) break;
	if (newtree) {
		newtree = BKE_libblock_copy(&ntree->id);
	}
	else {
		newtree = MEM_dupallocN(ntree);
		BKE_libblock_copy_data(&newtree->id, &ntree->id, TRUE); /* copy animdata and ID props */
	}

	id_us_plus((ID *)newtree->gpd);

	/* in case a running nodetree is copied */
	newtree->execdata = NULL;
	
	newtree->nodes.first = newtree->nodes.last = NULL;
	newtree->links.first = newtree->links.last = NULL;
	
	last = ntree->nodes.last;
	for (node = ntree->nodes.first; node; node = node->next) {

		/* ntreeUserDecrefID inline */
		if (do_id_user) {
			id_us_plus(node->id);
		}

		if (do_make_extern) {
			id_lib_extern(node->id);
		}

		node->new_node = NULL;
		/* nnode= */ nodeCopyNode(newtree, node);   /* sets node->new */
		
		/* make sure we don't copy new nodes again! */
		if (node == last)
			break;
	}
	
	/* socket definition for group usage */
	BLI_duplicatelist(&newtree->inputs, &ntree->inputs);
	for (gsock = newtree->inputs.first, oldgsock = ntree->inputs.first; gsock; gsock = gsock->next, oldgsock = oldgsock->next) {
		oldgsock->new_sock = gsock;
		gsock->groupsock = (oldgsock->groupsock ? oldgsock->groupsock->new_sock : NULL);
		gsock->default_value = node_socket_make_default_value(oldgsock->type);
		node_socket_copy_default_value(oldgsock->type, gsock->default_value, oldgsock->default_value);
	}
	BLI_duplicatelist(&newtree->outputs, &ntree->outputs);
	for (gsock = newtree->outputs.first, oldgsock = ntree->outputs.first; gsock; gsock = gsock->next, oldgsock = oldgsock->next) {
		oldgsock->new_sock = gsock;
		gsock->groupsock = (oldgsock->groupsock ? oldgsock->groupsock->new_sock : NULL);
		gsock->default_value = node_socket_make_default_value(oldgsock->type);
		node_socket_copy_default_value(oldgsock->type, gsock->default_value, oldgsock->default_value);
	}
	
	/* copy links */
	BLI_duplicatelist(&newtree->links, &ntree->links);
	for (link = newtree->links.first; link; link = link->next) {
		link->fromnode = (link->fromnode ? link->fromnode->new_node : NULL);
		link->fromsock = (link->fromsock ? link->fromsock->new_sock : NULL);
		link->tonode = (link->tonode ? link->tonode->new_node : NULL);
		link->tosock = (link->tosock ? link->tosock->new_sock : NULL);
		/* update the link socket's pointer */
		if (link->tosock)
			link->tosock->link = link;
	}
	
	/* update node->parent pointers */
	for (node = newtree->nodes.first; node; node = node->next) {
		if (node->parent)
			node->parent = node->parent->new_node;
	}
	
	return newtree;
}

bNodeTree *ntreeCopyTree_ex(bNodeTree *ntree, const short do_id_user)
{
	return ntreeCopyTree_internal(ntree, do_id_user, TRUE);
}
bNodeTree *ntreeCopyTree(bNodeTree *ntree)
{
	return ntreeCopyTree_ex(ntree, TRUE);
}

/* use when duplicating scenes */
void ntreeSwitchID_ex(bNodeTree *ntree, ID *id_from, ID *id_to, const short do_id_user)
{
	bNode *node;

	if (id_from == id_to) {
		/* should never happen but may as well skip if it does */
		return;
	}

	/* for scene duplication only */
	for (node = ntree->nodes.first; node; node = node->next) {
		if (node->id == id_from) {
			if (do_id_user) {
				id_us_min(id_from);
				id_us_plus(id_to);
			}

			node->id = id_to;
		}
	}
}
void ntreeSwitchID(bNodeTree *ntree, ID *id_from, ID *id_to)
{
	ntreeSwitchID_ex(ntree, id_from, id_to, TRUE);
}

void ntreeUserIncrefID(bNodeTree *ntree)
{
	bNode *node;
	for (node = ntree->nodes.first; node; node = node->next) {
		id_us_plus(node->id);
	}
}
void ntreeUserDecrefID(bNodeTree *ntree)
{
	bNode *node;
	for (node = ntree->nodes.first; node; node = node->next) {
		id_us_min(node->id);
	}
}

/* *************** preview *********** */
/* if node->preview, then we assume the rect to exist */

void nodeFreePreview(bNode *node)
{
	if (node->preview) {
		if (node->preview->rect)
			MEM_freeN(node->preview->rect);
		MEM_freeN(node->preview);
		node->preview = NULL;
	}	
}

static void node_init_preview(bNode *node, int xsize, int ysize)
{
	
	if (node->preview == NULL) {
		node->preview = MEM_callocN(sizeof(bNodePreview), "node preview");
		//		printf("added preview %s\n", node->name);
	}
	
	/* node previews can get added with variable size this way */
	if (xsize == 0 || ysize == 0)
		return;
	
	/* sanity checks & initialize */
	if (node->preview->rect) {
		if (node->preview->xsize != xsize && node->preview->ysize != ysize) {
			MEM_freeN(node->preview->rect);
			node->preview->rect = NULL;
		}
	}
	
	if (node->preview->rect == NULL) {
		node->preview->rect = MEM_callocN(4 * xsize + xsize * ysize * sizeof(char) * 4, "node preview rect");
		node->preview->xsize = xsize;
		node->preview->ysize = ysize;
	}
	/* no clear, makes nicer previews */
}

void ntreeInitPreview(bNodeTree *ntree, int xsize, int ysize)
{
	bNode *node;
	
	if (ntree == NULL)
		return;
	
	for (node = ntree->nodes.first; node; node = node->next) {
		if (node->typeinfo->flag & NODE_PREVIEW)    /* hrms, check for closed nodes? */
			node_init_preview(node, xsize, ysize);
		if (node->type == NODE_GROUP && (node->flag & NODE_GROUP_EDIT))
			ntreeInitPreview((bNodeTree *)node->id, xsize, ysize);
	}		
}

static void nodeClearPreview(bNode *node)
{
	if (node->preview && node->preview->rect)
		memset(node->preview->rect, 0, MEM_allocN_len(node->preview->rect));
}

/* use it to enforce clear */
void ntreeClearPreview(bNodeTree *ntree)
{
	bNode *node;
	
	if (ntree == NULL)
		return;
	
	for (node = ntree->nodes.first; node; node = node->next) {
		if (node->typeinfo->flag & NODE_PREVIEW)
			nodeClearPreview(node);
		if (node->type == NODE_GROUP && (node->flag & NODE_GROUP_EDIT))
			ntreeClearPreview((bNodeTree *)node->id);
	}		
}

/* hack warning! this function is only used for shader previews, and 
 * since it gets called multiple times per pixel for Ztransp we only
 * add the color once. Preview gets cleared before it starts render though */
void nodeAddToPreview(bNode *node, float col[4], int x, int y, int do_manage)
{
	bNodePreview *preview = node->preview;
	if (preview) {
		if (x >= 0 && y >= 0) {
			if (x < preview->xsize && y < preview->ysize) {
				unsigned char *tar = preview->rect + 4 * ((preview->xsize * y) + x);
				
				if (do_manage) {
					linearrgb_to_srgb_uchar4(tar, col);
				}
				else {
					rgba_float_to_uchar(tar, col);
				}
			}
			//else printf("prv out bound x y %d %d\n", x, y);
		}
		//else printf("prv out bound x y %d %d\n", x, y);
	}
}

/* ************** Free stuff ********** */

/* goes over entire tree */
void nodeUnlinkNode(bNodeTree *ntree, bNode *node)
{
	bNodeLink *link, *next;
	bNodeSocket *sock;
	ListBase *lb;
	
	for (link = ntree->links.first; link; link = next) {
		next = link->next;
		
		if (link->fromnode == node) {
			lb = &node->outputs;
			if (link->tonode)
				link->tonode->update |= NODE_UPDATE;
		}
		else if (link->tonode == node)
			lb = &node->inputs;
		else
			lb = NULL;

		if (lb) {
			for (sock = lb->first; sock; sock = sock->next) {
				if (link->fromsock == sock || link->tosock == sock)
					break;
			}
			if (sock) {
				nodeRemLink(ntree, link);
			}
		}
	}
}

static void node_unlink_attached(bNodeTree *ntree, bNode *parent)
{
	bNode *node;
	for (node = ntree->nodes.first; node; node = node->next) {
		if (node->parent == parent)
			nodeDetachNode(node);
	}
}

/** \note caller needs to manage node->id user */
void nodeFreeNode(bNodeTree *ntree, bNode *node)
{
	bNodeSocket *sock, *nextsock;
	
	/* can be called for nodes outside a node tree (e.g. clipboard) */
	if (ntree) {
		bNodeTreeType *treetype = ntreeGetType(ntree->type);

		/* remove all references to this node */
		nodeUnlinkNode(ntree, node);
		node_unlink_attached(ntree, node);

		BLI_remlink(&ntree->nodes, node);

		if (treetype->free_node_cache)
			treetype->free_node_cache(ntree, node);
	}
	
	/* since it is called while free database, node->id is undefined */
	
	if (node->typeinfo && node->typeinfo->freestoragefunc)
		node->typeinfo->freestoragefunc(node);
	
	for (sock = node->inputs.first; sock; sock = nextsock) {
		nextsock = sock->next;
		node_socket_free_default_value(sock->type, sock->default_value);
		MEM_freeN(sock);
	}
	for (sock = node->outputs.first; sock; sock = nextsock) {
		nextsock = sock->next;
		node_socket_free_default_value(sock->type, sock->default_value);
		MEM_freeN(sock);
	}

	nodeFreePreview(node);

	MEM_freeN(node);
	
	if (ntree)
		ntree->update |= NTREE_UPDATE_NODES;
}

/* do not free ntree itself here, BKE_libblock_free calls this function too */
void ntreeFreeTree_ex(bNodeTree *ntree, const short do_id_user)
{
	bNode *node, *next;
	bNodeSocket *sock;
	
	if (ntree == NULL) return;
	
	/* XXX hack! node trees should not store execution graphs at all.
	 * This should be removed when old tree types no longer require it.
	 * Currently the execution data for texture nodes remains in the tree
	 * after execution, until the node tree is updated or freed.
	 */
	if (ntree->execdata) {
		switch (ntree->type) {
			case NTREE_COMPOSIT:
				ntreeCompositEndExecTree(ntree->execdata, 1);
				break;
			case NTREE_SHADER:
				ntreeShaderEndExecTree(ntree->execdata, 1);
				break;
			case NTREE_TEXTURE:
				ntreeTexEndExecTree(ntree->execdata, 1);
				break;
		}
	}
	
	BKE_free_animdata((ID *)ntree);
	
	id_us_min((ID *)ntree->gpd);

	BLI_freelistN(&ntree->links);   /* do first, then unlink_node goes fast */
	
	for (node = ntree->nodes.first; node; node = next) {
		next = node->next;

		/* ntreeUserIncrefID inline */

		/* XXX, this is correct, however when freeing the entire database
		 * this ends up accessing freed data which isn't properly unlinking
		 * its self from scene nodes, SO - for now prefer invalid usercounts
		 * on free rather then bad memory access - Campbell */
#if 0
		if (do_id_user) {
			id_us_min(node->id);
		}
#else
		(void)do_id_user;
#endif

		nodeFreeNode(ntree, node);
	}
	
	for (sock = ntree->inputs.first; sock; sock = sock->next)
		node_socket_free_default_value(sock->type, sock->default_value);
	BLI_freelistN(&ntree->inputs);
	for (sock = ntree->outputs.first; sock; sock = sock->next)
		node_socket_free_default_value(sock->type, sock->default_value);
	BLI_freelistN(&ntree->outputs);
}
/* same as ntreeFreeTree_ex but always manage users */
void ntreeFreeTree(bNodeTree *ntree)
{
	ntreeFreeTree_ex(ntree, TRUE);
}

void ntreeFreeCache(bNodeTree *ntree)
{
	bNodeTreeType *treetype;
	
	if (ntree == NULL) return;
	
	treetype = ntreeGetType(ntree->type);
	if (treetype->free_cache)
		treetype->free_cache(ntree);
}

void ntreeSetOutput(bNodeTree *ntree)
{
	bNode *node;

	/* find the active outputs, might become tree type dependent handler */
	for (node = ntree->nodes.first; node; node = node->next) {
		if (node->typeinfo->nclass == NODE_CLASS_OUTPUT) {
			bNode *tnode;
			int output = 0;
			
			/* we need a check for which output node should be tagged like this, below an exception */
			if (node->type == CMP_NODE_OUTPUT_FILE)
				continue;

			/* there is more types having output class, each one is checked */
			for (tnode = ntree->nodes.first; tnode; tnode = tnode->next) {
				if (tnode->typeinfo->nclass == NODE_CLASS_OUTPUT) {
					
					if (ntree->type == NTREE_COMPOSIT) {
							
						/* same type, exception for viewer */
						if (tnode->type == node->type ||
						    (ELEM(tnode->type, CMP_NODE_VIEWER, CMP_NODE_SPLITVIEWER) &&
						     ELEM(node->type, CMP_NODE_VIEWER, CMP_NODE_SPLITVIEWER)))
						{
							if (tnode->flag & NODE_DO_OUTPUT) {
								output++;
								if (output > 1)
									tnode->flag &= ~NODE_DO_OUTPUT;
							}
						}
					}
					else {
						/* same type */
						if (tnode->type == node->type) {
							if (tnode->flag & NODE_DO_OUTPUT) {
								output++;
								if (output > 1)
									tnode->flag &= ~NODE_DO_OUTPUT;
							}
						}
					}
				}
			}
			if (output == 0)
				node->flag |= NODE_DO_OUTPUT;
		}
	}
	
	/* here we could recursively set which nodes have to be done,
	 * might be different for editor or for "real" use... */
}

typedef struct MakeLocalCallData {
	ID *group_id;
	ID *new_id;
	int lib, local;
} MakeLocalCallData;

static void ntreeMakeLocal_CheckLocal(void *calldata, ID *owner_id, bNodeTree *ntree)
{
	MakeLocalCallData *cd = (MakeLocalCallData *)calldata;
	bNode *node;
	
	/* find if group is in tree */
	for (node = ntree->nodes.first; node; node = node->next) {
		if (node->id == cd->group_id) {
			if (owner_id->lib) {
				cd->lib = TRUE;
			}
			else {
				cd->local = TRUE;
			}
		}
	}
}

static void ntreeMakeLocal_LinkNew(void *calldata, ID *owner_id, bNodeTree *ntree)
{
	MakeLocalCallData *cd = (MakeLocalCallData *)calldata;
	bNode *node;
	
	/* find if group is in tree */
	for (node = ntree->nodes.first; node; node = node->next) {
		if (node->id == cd->group_id) {
			if (owner_id->lib == NULL) {
				node->id = cd->new_id;
				cd->new_id->us++;
				cd->group_id->us--;
			}
		}
	}
}

void ntreeMakeLocal(bNodeTree *ntree)
{
	Main *bmain = G.main;
	bNodeTreeType *treetype = ntreeGetType(ntree->type);
	MakeLocalCallData cd;
	
	/* - only lib users: do nothing
	 * - only local users: set flag
	 * - mixed: make copy
	 */
	
	if (ntree->id.lib == NULL) return;
	if (ntree->id.us == 1) {
		id_clear_lib_data(bmain, (ID *)ntree);
		return;
	}
	
	/* now check users of groups... again typedepending, callback... */
	cd.group_id = &ntree->id;
	cd.new_id = NULL;
	cd.local = 0;
	cd.lib = 0;
	
	treetype->foreach_nodetree(G.main, &cd, &ntreeMakeLocal_CheckLocal);
	
	/* if all users are local, we simply make tree local */
	if (cd.local && cd.lib == 0) {
		id_clear_lib_data(bmain, (ID *)ntree);
	}
	else if (cd.local && cd.lib) {
		/* this is the mixed case, we copy the tree and assign it to local users */
		bNodeTree *newtree = ntreeCopyTree(ntree);
		
		newtree->id.us = 0;
		

		cd.new_id = &newtree->id;
		treetype->foreach_nodetree(G.main, &cd, &ntreeMakeLocal_LinkNew);
	}
}

int ntreeNodeExists(bNodeTree *ntree, bNode *testnode)
{
	bNode *node = ntree->nodes.first;
	for (; node; node = node->next)
		if (node == testnode)
			return 1;
	return 0;
}

int ntreeOutputExists(bNode *node, bNodeSocket *testsock)
{
	bNodeSocket *sock = node->outputs.first;
	for (; sock; sock = sock->next)
		if (sock == testsock)
			return 1;
	return 0;
}

/* returns localized tree for execution in threads */
bNodeTree *ntreeLocalize(bNodeTree *ntree)
{
	bNodeTreeType *ntreetype = ntreeGetType(ntree->type);

	bNodeTree *ltree;
	bNode *node;
	
	bAction *action_backup = NULL, *tmpact_backup = NULL;
	
	/* Workaround for copying an action on each render!
	 * set action to NULL so animdata actions don't get copied */
	AnimData *adt = BKE_animdata_from_id(&ntree->id);

	if (adt) {
		action_backup = adt->action;
		tmpact_backup = adt->tmpact;

		adt->action = NULL;
		adt->tmpact = NULL;
	}

	/* node copy func */
	ltree = ntreeCopyTree_internal(ntree, FALSE, FALSE);

	if (adt) {
		AnimData *ladt = BKE_animdata_from_id(&ltree->id);

		adt->action = ladt->action = action_backup;
		adt->tmpact = ladt->tmpact = tmpact_backup;

		if (action_backup) action_backup->id.us++;
		if (tmpact_backup) tmpact_backup->id.us++;
		
	}
	/* end animdata uglyness */

	/* ensures only a single output node is enabled */
	ntreeSetOutput(ntree);

	for (node = ntree->nodes.first; node; node = node->next) {
		/* store new_node pointer to original */
		node->new_node->new_node = node;
	}

	if (ntreetype->localize)
		ntreetype->localize(ltree, ntree);

	return ltree;
}

/* sync local composite with real tree */
/* local tree is supposed to be running, be careful moving previews! */
/* is called by jobs manager, outside threads, so it doesnt happen during draw */
void ntreeLocalSync(bNodeTree *localtree, bNodeTree *ntree)
{
	bNodeTreeType *ntreetype = ntreeGetType(ntree->type);

	if (ntreetype->local_sync)
		ntreetype->local_sync(localtree, ntree);
}

/* merge local tree results back, and free local tree */
/* we have to assume the editor already changed completely */
void ntreeLocalMerge(bNodeTree *localtree, bNodeTree *ntree)
{
	bNodeTreeType *ntreetype = ntreeGetType(ntree->type);
	bNode *lnode;
	
	/* move over the compbufs and previews */
	for (lnode = localtree->nodes.first; lnode; lnode = lnode->next) {
		if (ntreeNodeExists(ntree, lnode->new_node)) {
			if (lnode->preview && lnode->preview->rect) {
				nodeFreePreview(lnode->new_node);
				lnode->new_node->preview = lnode->preview;
				lnode->preview = NULL;
			}
		}
	}

	if (ntreetype->local_merge)
		ntreetype->local_merge(localtree, ntree);

	ntreeFreeTree_ex(localtree, FALSE);
	MEM_freeN(localtree);
}

/* ************ find stuff *************** */

int ntreeHasType(bNodeTree *ntree, int type)
{
	bNode *node;
	
	if (ntree)
		for (node = ntree->nodes.first; node; node = node->next)
			if (node->type == type)
				return 1;
	return 0;
}

bNodeLink *nodeFindLink(bNodeTree *ntree, bNodeSocket *from, bNodeSocket *to)
{
	bNodeLink *link;
	
	for (link = ntree->links.first; link; link = link->next) {
		if (link->fromsock == from && link->tosock == to)
			return link;
		if (link->fromsock == to && link->tosock == from) /* hrms? */
			return link;
	}
	return NULL;
}

int nodeCountSocketLinks(bNodeTree *ntree, bNodeSocket *sock)
{
	bNodeLink *link;
	int tot = 0;
	
	for (link = ntree->links.first; link; link = link->next) {
		if (link->fromsock == sock || link->tosock == sock)
			tot++;
	}
	return tot;
}

bNode *nodeGetActive(bNodeTree *ntree)
{
	bNode *node;
	
	if (ntree == NULL) return NULL;
	
	for (node = ntree->nodes.first; node; node = node->next)
		if (node->flag & NODE_ACTIVE)
			break;
	return node;
}

/* two active flags, ID nodes have special flag for buttons display */
bNode *nodeGetActiveID(bNodeTree *ntree, short idtype)
{
	bNode *node;
	
	if (ntree == NULL) return NULL;

	/* check for group edit */
	for (node = ntree->nodes.first; node; node = node->next)
		if (node->flag & NODE_GROUP_EDIT)
			break;

	if (node)
		ntree = (bNodeTree *)node->id;
	
	/* now find active node with this id */
	for (node = ntree->nodes.first; node; node = node->next)
		if (node->id && GS(node->id->name) == idtype)
			if (node->flag & NODE_ACTIVE_ID)
				break;

	return node;
}

int nodeSetActiveID(bNodeTree *ntree, short idtype, ID *id)
{
	bNode *node;
	int ok = FALSE;

	if (ntree == NULL) return ok;

	/* check for group edit */
	for (node = ntree->nodes.first; node; node = node->next)
		if (node->flag & NODE_GROUP_EDIT)
			break;

	if (node)
		ntree = (bNodeTree *)node->id;

	/* now find active node with this id */
	for (node = ntree->nodes.first; node; node = node->next) {
		if (node->id && GS(node->id->name) == idtype) {
			if (id && ok == FALSE && node->id == id) {
				node->flag |= NODE_ACTIVE_ID;
				ok = TRUE;
			}
			else {
				node->flag &= ~NODE_ACTIVE_ID;
			}
		}
	}

	return ok;
}


/* two active flags, ID nodes have special flag for buttons display */
void nodeClearActiveID(bNodeTree *ntree, short idtype)
{
	bNode *node;
	
	if (ntree == NULL) return;
	
	for (node = ntree->nodes.first; node; node = node->next)
		if (node->id && GS(node->id->name) == idtype)
			node->flag &= ~NODE_ACTIVE_ID;
}

void nodeClearActive(bNodeTree *ntree)
{
	bNode *node;

	if (ntree == NULL) return;

	for (node = ntree->nodes.first; node; node = node->next)
		node->flag &= ~(NODE_ACTIVE | NODE_ACTIVE_ID);
}


/* two active flags, ID nodes have special flag for buttons display */
void nodeSetActive(bNodeTree *ntree, bNode *node)
{
	bNode *tnode;
	
	/* make sure only one node is active, and only one per ID type */
	for (tnode = ntree->nodes.first; tnode; tnode = tnode->next) {
		tnode->flag &= ~NODE_ACTIVE;
		
		if (node->id && tnode->id) {
			if (GS(node->id->name) == GS(tnode->id->name))
				tnode->flag &= ~NODE_ACTIVE_ID;
		}
		if (node->typeinfo->nclass == NODE_CLASS_TEXTURE)
			tnode->flag &= ~NODE_ACTIVE_TEXTURE;
	}
	
	node->flag |= NODE_ACTIVE;
	if (node->id)
		node->flag |= NODE_ACTIVE_ID;
	if (node->typeinfo->nclass == NODE_CLASS_TEXTURE)
		node->flag |= NODE_ACTIVE_TEXTURE;
}

int nodeSocketIsHidden(bNodeSocket *sock)
{
	return ((sock->flag & (SOCK_HIDDEN | SOCK_UNAVAIL)) != 0);
}

void nodeSocketSetType(bNodeSocket *sock, int type)
{
	int old_type = sock->type;
	void *old_default_value = sock->default_value;
	
	sock->type = type;
	
	sock->default_value = node_socket_make_default_value(sock->type);
	node_socket_init_default_value(type, sock->default_value);
	node_socket_convert_default_value(sock->type, sock->default_value, old_type, old_default_value);
	node_socket_free_default_value(old_type, old_default_value);
}

/* ************** Node Clipboard *********** */

#define USE_NODE_CB_VALIDATE

#ifdef USE_NODE_CB_VALIDATE
/**
 * This data structure is to validate the node on creation,
 * otherwise we may reference missing data.
 *
 * Currently its only used for ID's, but nodes may one day
 * reference other pointers which need validation.
 */
typedef struct bNodeClipboardExtraInfo {
	struct bNodeClipboardExtraInfo *next, *prev;
	ID  *id;
	char id_name[MAX_ID_NAME];
	char library_name[FILE_MAX];
} bNodeClipboardExtraInfo;
#endif  /* USE_NODE_CB_VALIDATE */


typedef struct bNodeClipboard {
	ListBase nodes;

#ifdef USE_NODE_CB_VALIDATE
	ListBase nodes_extra_info;
#endif

	ListBase links;
	int type;
} bNodeClipboard;

bNodeClipboard node_clipboard = {{0}};

void BKE_node_clipboard_init(struct bNodeTree *ntree)
{
	node_clipboard.type = ntree->type;
}

void BKE_node_clipboard_clear(void)
{
	bNode *node, *node_next;
	bNodeLink *link, *link_next;
	
	for (link = node_clipboard.links.first; link; link = link_next) {
		link_next = link->next;
		nodeRemLink(NULL, link);
	}
	node_clipboard.links.first = node_clipboard.links.last = NULL;
	
	for (node = node_clipboard.nodes.first; node; node = node_next) {
		node_next = node->next;
		nodeFreeNode(NULL, node);
	}
	node_clipboard.nodes.first = node_clipboard.nodes.last = NULL;

#ifdef USE_NODE_CB_VALIDATE
	BLI_freelistN(&node_clipboard.nodes_extra_info);
#endif
}

/* return FALSE when one or more ID's are lost */
int BKE_node_clipboard_validate(void)
{
	int ok = TRUE;

#ifdef USE_NODE_CB_VALIDATE
	bNodeClipboardExtraInfo *node_info;
	bNode *node;


	/* lists must be aligned */
	BLI_assert(BLI_countlist(&node_clipboard.nodes) ==
			   BLI_countlist(&node_clipboard.nodes_extra_info));

	for (node = node_clipboard.nodes.first, node_info = node_clipboard.nodes_extra_info.first;
		 node;
		 node = node->next, node_info = node_info->next)
	{
		/* validate the node against the stored node info */

		/* re-assign each loop since we may clear,
		 * open a new file where the ID is valid, and paste again */
		node->id = node_info->id;

		/* currently only validate the ID */
		if (node->id) {
			ListBase *lb = which_libbase(G.main, GS(node_info->id_name));
			BLI_assert(lb != NULL);

			if (BLI_findindex(lb, node_info->id) == -1) {
				/* may assign NULL */
				node->id = BLI_findstring(lb, node_info->id_name + 2, offsetof(ID, name) + 2);

				if (node->id == NULL) {
					ok = FALSE;
				}
			}
		}
	}
#endif  /* USE_NODE_CB_VALIDATE */

	return ok;
}

void BKE_node_clipboard_add_node(bNode *node)
{
#ifdef USE_NODE_CB_VALIDATE
	/* add extra info */
	bNodeClipboardExtraInfo *node_info = MEM_mallocN(sizeof(bNodeClipboardExtraInfo), STRINGIFY(bNodeClipboardExtraInfo));

	node_info->id = node->id;
	if (node->id) {
		BLI_strncpy(node_info->id_name, node->id->name, sizeof(node_info->id_name));
		if (node->id->lib) {
			BLI_strncpy(node_info->library_name, node->id->lib->filepath, sizeof(node_info->library_name));
		}
		else {
			node_info->library_name[0] = '\0';
		}
	}
	else {
		node_info->id_name[0] = '\0';
		node_info->library_name[0] = '\0';
	}
	BLI_addtail(&node_clipboard.nodes_extra_info, node_info);
	/* end extra info */
#endif  /* USE_NODE_CB_VALIDATE */

	/* add node */
	BLI_addtail(&node_clipboard.nodes, node);

}

void BKE_node_clipboard_add_link(bNodeLink *link)
{
	BLI_addtail(&node_clipboard.links, link);
}

const ListBase *BKE_node_clipboard_get_nodes(void)
{
	return &node_clipboard.nodes;
}

const ListBase *BKE_node_clipboard_get_links(void)
{
	return &node_clipboard.links;
}

int BKE_node_clipboard_get_type(void)
{
	return node_clipboard.type;
}

/* ************** dependency stuff *********** */

/* node is guaranteed to be not checked before */
static int node_get_deplist_recurs(bNode *node, bNode ***nsort)
{
	bNode *fromnode;
	bNodeSocket *sock;
	int level = 0xFFF;
	
	node->done = TRUE;
	
	/* check linked nodes */
	for (sock = node->inputs.first; sock; sock = sock->next) {
		if (sock->link) {
			fromnode = sock->link->fromnode;
			if (fromnode) {
				if (fromnode->done == 0)
					fromnode->level = node_get_deplist_recurs(fromnode, nsort);
				if (fromnode->level <= level)
					level = fromnode->level - 1;
			}
		}
	}
	
	/* check parent node */
	if (node->parent) {
		if (node->parent->done == 0)
			node->parent->level = node_get_deplist_recurs(node->parent, nsort);
		if (node->parent->level <= level)
			level = node->parent->level - 1;
	}
	
	if (nsort) {
		**nsort = node;
		(*nsort)++;
	}
	
	return level;
}

void ntreeGetDependencyList(struct bNodeTree *ntree, struct bNode ***deplist, int *totnodes)
{
	bNode *node, **nsort;
	
	*totnodes = 0;
	
	/* first clear data */
	for (node = ntree->nodes.first; node; node = node->next) {
		node->done = FALSE;
		(*totnodes)++;
	}
	if (*totnodes == 0) {
		*deplist = NULL;
		return;
	}
	
	nsort = *deplist = MEM_callocN((*totnodes) * sizeof(bNode *), "sorted node array");
	
	/* recursive check */
	for (node = ntree->nodes.first; node; node = node->next) {
		if (node->done == 0) {
			node->level = node_get_deplist_recurs(node, &nsort);
		}
	}
}

/* only updates node->level for detecting cycles links */
static void ntree_update_node_level(bNodeTree *ntree)
{
	bNode *node;
	
	/* first clear tag */
	for (node = ntree->nodes.first; node; node = node->next) {
		node->done = FALSE;
	}
	
	/* recursive check */
	for (node = ntree->nodes.first; node; node = node->next) {
		if (node->done == 0) {
			node->level = node_get_deplist_recurs(node, NULL);
		}
	}
}

static void ntree_update_link_pointers(bNodeTree *ntree)
{
	bNode *node;
	bNodeSocket *sock;
	bNodeLink *link;
	
	/* first clear data */
	for (node = ntree->nodes.first; node; node = node->next) {
		for (sock = node->inputs.first; sock; sock = sock->next) {
			sock->link = NULL;
			sock->flag &= ~SOCK_IN_USE;
		}
		for (sock = node->outputs.first; sock; sock = sock->next) {
			sock->flag &= ~SOCK_IN_USE;
		}
	}
	for (sock = ntree->inputs.first; sock; sock = sock->next) {
		sock->flag &= ~SOCK_IN_USE;
	}
	for (sock = ntree->outputs.first; sock; sock = sock->next) {
		sock->link = NULL;
		sock->flag &= ~SOCK_IN_USE;
	}

	for (link = ntree->links.first; link; link = link->next) {
		link->tosock->link = link;
		
		link->fromsock->flag |= SOCK_IN_USE;
		link->tosock->flag |= SOCK_IN_USE;
	}
}

static void ntree_validate_links(bNodeTree *ntree)
{
	bNodeTreeType *ntreetype = ntreeGetType(ntree->type);
	bNodeLink *link;
	
	for (link = ntree->links.first; link; link = link->next) {
		link->flag |= NODE_LINK_VALID;
		if (link->fromnode && link->tonode && link->fromnode->level <= link->tonode->level)
			link->flag &= ~NODE_LINK_VALID;
		else if (ntreetype->validate_link) {
			if (!ntreetype->validate_link(ntree, link))
				link->flag &= ~NODE_LINK_VALID;
		}
	}
}

static void ntree_verify_nodes_cb(void *calldata, struct ID *UNUSED(owner_id), struct bNodeTree *ntree)
{
	ID *id = (ID *)calldata;
	bNode *node;
	
	for (node = ntree->nodes.first; node; node = node->next)
		if (node->typeinfo->verifyfunc)
			node->typeinfo->verifyfunc(ntree, node, id);
}

void ntreeVerifyNodes(struct Main *main, struct ID *id)
{
	bNodeTreeType *ntreetype;
	bNodeTree *ntree;
	int n;
	
	for (n = 0; n < NUM_NTREE_TYPES; ++n) {
		ntreetype = ntreeGetType(n);
		if (ntreetype && ntreetype->foreach_nodetree)
			ntreetype->foreach_nodetree(main, id, ntree_verify_nodes_cb);
	}
	for (ntree = main->nodetree.first; ntree; ntree = ntree->id.next)
		ntree_verify_nodes_cb(id, NULL, ntree);
}

void ntreeUpdateTree(bNodeTree *ntree)
{
	bNodeTreeType *ntreetype = ntreeGetType(ntree->type);
	bNode *node;
	
	if (ntree->update & (NTREE_UPDATE_LINKS | NTREE_UPDATE_NODES)) {
		/* set the bNodeSocket->link pointers */
		ntree_update_link_pointers(ntree);
		
		/* update the node level from link dependencies */
		ntree_update_node_level(ntree);
	}
	
	/* update individual nodes */
	for (node = ntree->nodes.first; node; node = node->next) {
		/* node tree update tags override individual node update flags */
		if ((node->update & NODE_UPDATE) || (ntree->update & NTREE_UPDATE)) {
			if (ntreetype->update_node)
				ntreetype->update_node(ntree, node);
			else if (node->typeinfo->updatefunc)
				node->typeinfo->updatefunc(ntree, node);
		}
	}
	
	/* check link validity */
	if (ntree->update & (NTREE_UPDATE_LINKS | NTREE_UPDATE_NODES))
		ntree_validate_links(ntree);
	
	/* generic tree update callback */
	if (ntreetype->update)
		ntreetype->update(ntree);
	else {
		/* Trees can be associated with a specific node type (i.e. group nodes),
		 * in that case a tree update function may be defined by that node type.
		 */
		bNodeType *ntype = node_get_type(ntree, ntree->nodetype);
		if (ntype && ntype->updatetreefunc)
			ntype->updatetreefunc(ntree);
	}
	
	/* XXX hack, should be done by depsgraph!! */
	ntreeVerifyNodes(G.main, &ntree->id);
	
	/* clear update flags */
	for (node = ntree->nodes.first; node; node = node->next) {
		node->update = 0;
	}
	ntree->update = 0;
}

void nodeUpdate(bNodeTree *ntree, bNode *node)
{
	bNodeTreeType *ntreetype = ntreeGetType(ntree->type);
	
	if (ntreetype->update_node)
		ntreetype->update_node(ntree, node);
	else if (node->typeinfo->updatefunc)
		node->typeinfo->updatefunc(ntree, node);
	/* clear update flag */
	node->update = 0;
}

int nodeUpdateID(bNodeTree *ntree, ID *id)
{
	bNodeTreeType *ntreetype;
	bNode *node;
	int change = FALSE;
	
	if (ELEM(NULL, id, ntree))
		return change;
	
	ntreetype = ntreeGetType(ntree->type);
	
	if (ntreetype->update_node) {
		for (node = ntree->nodes.first; node; node = node->next) {
			if (node->id == id) {
				change = TRUE;
				node->update |= NODE_UPDATE_ID;
				ntreetype->update_node(ntree, node);
				/* clear update flag */
				node->update = 0;
			}
		}
	}
	else {
		for (node = ntree->nodes.first; node; node = node->next) {
			if (node->id == id) {
				change = TRUE;
				node->update |= NODE_UPDATE_ID;
				if (node->typeinfo->updatefunc)
					node->typeinfo->updatefunc(ntree, node);
				/* clear update flag */
				node->update = 0;
			}
		}
	}
	
	return change;
}


/* ************* node type access ********** */

int nodeValid(bNodeTree *ntree, bNodeTemplate *ntemp)
{
	bNodeType *ntype = node_get_type(ntree, ntemp->type);
	if (ntype) {
		if (ntype->validfunc)
			return ntype->validfunc(ntree, ntemp);
		else
			return 1;
	}
	else
		return 0;
}

const char *nodeLabel(bNode *node)
{
	if (node->label[0] != '\0')
		return node->label;
	else if (node->typeinfo->labelfunc)
		return node->typeinfo->labelfunc(node);
	else
		return IFACE_(node->typeinfo->name);
}

struct bNodeTree *nodeGroupEditGet(struct bNode *node)
{
	if (node->typeinfo->group_edit_get)
		return node->typeinfo->group_edit_get(node);
	else
		return NULL;
}

struct bNodeTree *nodeGroupEditSet(struct bNode *node, int edit)
{
	if (node->typeinfo->group_edit_set)
		return node->typeinfo->group_edit_set(node, edit);
	else if (node->typeinfo->group_edit_get)
		return node->typeinfo->group_edit_get(node);
	else
		return NULL;
}

void nodeGroupEditClear(struct bNode *node)
{
	if (node->typeinfo->group_edit_clear)
		node->typeinfo->group_edit_clear(node);
}

struct bNodeTemplate nodeMakeTemplate(struct bNode *node)
{
	bNodeTemplate ntemp;
	if (node->typeinfo->templatefunc)
		return node->typeinfo->templatefunc(node);
	else {
		ntemp.type = node->type;
		return ntemp;
	}
}

void node_type_base(bNodeTreeType *ttype, bNodeType *ntype, int type, const char *name, short nclass, short flag)
{
	memset(ntype, 0, sizeof(bNodeType));

	ntype->type = type;
	BLI_strncpy(ntype->name, name, sizeof(ntype->name));
	ntype->nclass = nclass;
	ntype->flag = flag;

	/* Default muting stuff. */
	if (ttype)
		ntype->internal_connect = ttype->internal_connect;

	/* default size values */
	ntype->width = 140;
	ntype->minwidth = 100;
	ntype->maxwidth = 320;
	ntype->height = 100;
	ntype->minheight = 30;
	ntype->maxheight = FLT_MAX;
}

void node_type_socket_templates(struct bNodeType *ntype, struct bNodeSocketTemplate *inputs, struct bNodeSocketTemplate *outputs)
{
	ntype->inputs = inputs;
	ntype->outputs = outputs;
}

void node_type_init(struct bNodeType *ntype, void (*initfunc)(struct bNodeTree *ntree, struct bNode *node, struct bNodeTemplate *ntemp))
{
	ntype->initfunc = initfunc;
}

void node_type_valid(struct bNodeType *ntype, int (*validfunc)(struct bNodeTree *ntree, struct bNodeTemplate *ntemp))
{
	ntype->validfunc = validfunc;
}

void node_type_size(struct bNodeType *ntype, int width, int minwidth, int maxwidth)
{
	ntype->width = width;
	ntype->minwidth = minwidth;
	if (maxwidth <= minwidth)
		ntype->maxwidth = FLT_MAX;
	else
		ntype->maxwidth = maxwidth;
}

void node_type_storage(bNodeType *ntype, const char *storagename, void (*freestoragefunc)(struct bNode *), void (*copystoragefunc)(struct bNode *, struct bNode *))
{
	if (storagename)
		BLI_strncpy(ntype->storagename, storagename, sizeof(ntype->storagename));
	else
		ntype->storagename[0] = '\0';
	ntype->copystoragefunc = copystoragefunc;
	ntype->freestoragefunc = freestoragefunc;
}

void node_type_label(struct bNodeType *ntype, const char *(*labelfunc)(struct bNode *))
{
	ntype->labelfunc = labelfunc;
}

void node_type_template(struct bNodeType *ntype, struct bNodeTemplate (*templatefunc)(struct bNode *))
{
	ntype->templatefunc = templatefunc;
}

void node_type_update(struct bNodeType *ntype,
                      void (*updatefunc)(struct bNodeTree *ntree, struct bNode *node),
                      void (*verifyfunc)(struct bNodeTree *ntree, struct bNode *node, struct ID *id))
{
	ntype->updatefunc = updatefunc;
	ntype->verifyfunc = verifyfunc;
}

void node_type_tree(struct bNodeType *ntype, void (*inittreefunc)(struct bNodeTree *), void (*updatetreefunc)(struct bNodeTree *))
{
	ntype->inittreefunc = inittreefunc;
	ntype->updatetreefunc = updatetreefunc;
}

void node_type_group_edit(struct bNodeType *ntype,
                          struct bNodeTree *(*group_edit_get)(struct bNode *node),
                          struct bNodeTree *(*group_edit_set)(struct bNode *node, int edit),
                          void (*group_edit_clear)(struct bNode *node))
{
	ntype->group_edit_get = group_edit_get;
	ntype->group_edit_set = group_edit_set;
	ntype->group_edit_clear = group_edit_clear;
}

void node_type_exec(struct bNodeType *ntype, void (*execfunc)(void *data, struct bNode *, struct bNodeStack **, struct bNodeStack **))
{
	ntype->execfunc = execfunc;
}

void node_type_exec_new(struct bNodeType *ntype,
                        void *(*initexecfunc)(struct bNode *node),
                        void (*freeexecfunc)(struct bNode *node, void *nodedata),
                        void (*newexecfunc)(void *data, int thread, struct bNode *, void *nodedata, struct bNodeStack **, struct bNodeStack **))
{
	ntype->initexecfunc = initexecfunc;
	ntype->freeexecfunc = freeexecfunc;
	ntype->newexecfunc = newexecfunc;
}

void node_type_internal_connect(bNodeType *ntype, ListBase (*internal_connect)(bNodeTree *, bNode *))
{
	ntype->internal_connect = internal_connect;
}

void node_type_gpu(struct bNodeType *ntype, int (*gpufunc)(struct GPUMaterial *mat, struct bNode *node, struct GPUNodeStack *in, struct GPUNodeStack *out))
{
	ntype->gpufunc = gpufunc;
}

void node_type_gpu_ext(struct bNodeType *ntype, int (*gpuextfunc)(struct GPUMaterial *mat, struct bNode *node, void *nodedata, struct GPUNodeStack *in, struct GPUNodeStack *out))
{
	ntype->gpuextfunc = gpuextfunc;
}

void node_type_compatibility(struct bNodeType *ntype, short compatibility)
{
	ntype->compatibility = compatibility;
}

static bNodeType *is_nodetype_registered(ListBase *typelist, int type) 
{
	bNodeType *ntype = typelist->first;
	
	for (; ntype; ntype = ntype->next)
		if (ntype->type == type)
			return ntype;
	
	return NULL;
}

void nodeRegisterType(bNodeTreeType *ttype, bNodeType *ntype) 
{
	ListBase *typelist = &(ttype->node_types);
	bNodeType *found = is_nodetype_registered(typelist, ntype->type);
	
	if (found == NULL)
		BLI_addtail(typelist, ntype);
}

static void registerCompositNodes(bNodeTreeType *ttype)
{
	register_node_type_frame(ttype);
	register_node_type_reroute(ttype);
	
	register_node_type_cmp_group(ttype);
//	register_node_type_cmp_forloop(ttype);
//	register_node_type_cmp_whileloop(ttype);
	
	register_node_type_cmp_rlayers(ttype);
	register_node_type_cmp_image(ttype);
	register_node_type_cmp_texture(ttype);
	register_node_type_cmp_value(ttype);
	register_node_type_cmp_rgb(ttype);
	register_node_type_cmp_curve_time(ttype);
	register_node_type_cmp_movieclip(ttype);
	
	register_node_type_cmp_composite(ttype);
	register_node_type_cmp_viewer(ttype);
	register_node_type_cmp_splitviewer(ttype);
	register_node_type_cmp_output_file(ttype);
	register_node_type_cmp_view_levels(ttype);
	
	register_node_type_cmp_curve_rgb(ttype);
	register_node_type_cmp_mix_rgb(ttype);
	register_node_type_cmp_hue_sat(ttype);
	register_node_type_cmp_brightcontrast(ttype);
	register_node_type_cmp_gamma(ttype);
	register_node_type_cmp_invert(ttype);
	register_node_type_cmp_alphaover(ttype);
	register_node_type_cmp_zcombine(ttype);
	register_node_type_cmp_colorbalance(ttype);
	register_node_type_cmp_huecorrect(ttype);
	
	register_node_type_cmp_normal(ttype);
	register_node_type_cmp_curve_vec(ttype);
	register_node_type_cmp_map_value(ttype);
	register_node_type_cmp_normalize(ttype);
	
	register_node_type_cmp_filter(ttype);
	register_node_type_cmp_blur(ttype);
	register_node_type_cmp_dblur(ttype);
	register_node_type_cmp_bilateralblur(ttype);
	register_node_type_cmp_vecblur(ttype);
	register_node_type_cmp_dilateerode(ttype);
	register_node_type_cmp_inpaint(ttype);
	register_node_type_cmp_despeckle(ttype);
	register_node_type_cmp_defocus(ttype);
	
	register_node_type_cmp_valtorgb(ttype);
	register_node_type_cmp_rgbtobw(ttype);
	register_node_type_cmp_setalpha(ttype);
	register_node_type_cmp_idmask(ttype);
	register_node_type_cmp_math(ttype);
	register_node_type_cmp_seprgba(ttype);
	register_node_type_cmp_combrgba(ttype);
	register_node_type_cmp_sephsva(ttype);
	register_node_type_cmp_combhsva(ttype);
	register_node_type_cmp_sepyuva(ttype);
	register_node_type_cmp_combyuva(ttype);
	register_node_type_cmp_sepycca(ttype);
	register_node_type_cmp_combycca(ttype);
	register_node_type_cmp_premulkey(ttype);
	
	register_node_type_cmp_diff_matte(ttype);
	register_node_type_cmp_distance_matte(ttype);
	register_node_type_cmp_chroma_matte(ttype);
	register_node_type_cmp_color_matte(ttype);
	register_node_type_cmp_channel_matte(ttype);
	register_node_type_cmp_color_spill(ttype);
	register_node_type_cmp_luma_matte(ttype);
	register_node_type_cmp_doubleedgemask(ttype);
	register_node_type_cmp_keyingscreen(ttype);
	register_node_type_cmp_keying(ttype);

	register_node_type_cmp_translate(ttype);
	register_node_type_cmp_rotate(ttype);
	register_node_type_cmp_scale(ttype);
	register_node_type_cmp_flip(ttype);
	register_node_type_cmp_crop(ttype);
	register_node_type_cmp_displace(ttype);
	register_node_type_cmp_mapuv(ttype);
	register_node_type_cmp_glare(ttype);
	register_node_type_cmp_tonemap(ttype);
	register_node_type_cmp_lensdist(ttype);
	register_node_type_cmp_transform(ttype);
	register_node_type_cmp_stabilize2d(ttype);
	register_node_type_cmp_moviedistortion(ttype);

	register_node_type_cmp_colorcorrection(ttype);
	register_node_type_cmp_boxmask(ttype);
	register_node_type_cmp_ellipsemask(ttype);
	register_node_type_cmp_bokehimage(ttype);
	register_node_type_cmp_bokehblur(ttype);
	register_node_type_cmp_switch(ttype);

	register_node_type_cmp_mask(ttype);
	register_node_type_cmp_trackpos(ttype);
}

static void registerShaderNodes(bNodeTreeType *ttype) 
{
	register_node_type_frame(ttype);
	register_node_type_reroute(ttype);
	
	register_node_type_sh_group(ttype);
	//register_node_type_sh_forloop(ttype);
	//register_node_type_sh_whileloop(ttype);

	register_node_type_sh_output(ttype);
	register_node_type_sh_material(ttype);
	register_node_type_sh_camera(ttype);
	register_node_type_sh_gamma(ttype);
	register_node_type_sh_brightcontrast(ttype);
	register_node_type_sh_value(ttype);
	register_node_type_sh_rgb(ttype);
	register_node_type_sh_mix_rgb(ttype);
	register_node_type_sh_valtorgb(ttype);
	register_node_type_sh_rgbtobw(ttype);
	register_node_type_sh_texture(ttype);
	register_node_type_sh_normal(ttype);
	register_node_type_sh_geom(ttype);
	register_node_type_sh_mapping(ttype);
	register_node_type_sh_curve_vec(ttype);
	register_node_type_sh_curve_rgb(ttype);
	register_node_type_sh_math(ttype);
	register_node_type_sh_vect_math(ttype);
	register_node_type_sh_squeeze(ttype);
	register_node_type_sh_material_ext(ttype);
	register_node_type_sh_invert(ttype);
	register_node_type_sh_seprgb(ttype);
	register_node_type_sh_combrgb(ttype);
	register_node_type_sh_hue_sat(ttype);

	register_node_type_sh_attribute(ttype);
	register_node_type_sh_geometry(ttype);
	register_node_type_sh_light_path(ttype);
	register_node_type_sh_light_falloff(ttype);
	register_node_type_sh_object_info(ttype);
	register_node_type_sh_fresnel(ttype);
	register_node_type_sh_layer_weight(ttype);
	register_node_type_sh_tex_coord(ttype);
	register_node_type_sh_particle_info(ttype);

	register_node_type_sh_background(ttype);
	register_node_type_sh_bsdf_diffuse(ttype);
	register_node_type_sh_bsdf_glossy(ttype);
	register_node_type_sh_bsdf_glass(ttype);
	register_node_type_sh_bsdf_translucent(ttype);
	register_node_type_sh_bsdf_transparent(ttype);
	register_node_type_sh_bsdf_velvet(ttype);
	register_node_type_sh_emission(ttype);
	register_node_type_sh_holdout(ttype);
	//register_node_type_sh_volume_transparent(ttype);
	//register_node_type_sh_volume_isotropic(ttype);
	register_node_type_sh_mix_shader(ttype);
	register_node_type_sh_add_shader(ttype);

	register_node_type_sh_output_lamp(ttype);
	register_node_type_sh_output_material(ttype);
	register_node_type_sh_output_world(ttype);

	register_node_type_sh_tex_image(ttype);
	register_node_type_sh_tex_environment(ttype);
	register_node_type_sh_tex_sky(ttype);
	register_node_type_sh_tex_noise(ttype);
	register_node_type_sh_tex_wave(ttype);
	register_node_type_sh_tex_voronoi(ttype);
	register_node_type_sh_tex_musgrave(ttype);
	register_node_type_sh_tex_gradient(ttype);
	register_node_type_sh_tex_magic(ttype);
	register_node_type_sh_tex_checker(ttype);
	register_node_type_sh_tex_brick(ttype);
}

static void registerTextureNodes(bNodeTreeType *ttype)
{
	register_node_type_frame(ttype);
	register_node_type_reroute(ttype);
	
	register_node_type_tex_group(ttype);
//	register_node_type_tex_forloop(ttype);
//	register_node_type_tex_whileloop(ttype);
	
	register_node_type_tex_math(ttype);
	register_node_type_tex_mix_rgb(ttype);
	register_node_type_tex_valtorgb(ttype);
	register_node_type_tex_rgbtobw(ttype);
	register_node_type_tex_valtonor(ttype);
	register_node_type_tex_curve_rgb(ttype);
	register_node_type_tex_curve_time(ttype);
	register_node_type_tex_invert(ttype);
	register_node_type_tex_hue_sat(ttype);
	register_node_type_tex_coord(ttype);
	register_node_type_tex_distance(ttype);
	register_node_type_tex_compose(ttype);
	register_node_type_tex_decompose(ttype);
	
	register_node_type_tex_output(ttype);
	register_node_type_tex_viewer(ttype);
	
	register_node_type_tex_checker(ttype);
	register_node_type_tex_texture(ttype);
	register_node_type_tex_bricks(ttype);
	register_node_type_tex_image(ttype);
	
	register_node_type_tex_rotate(ttype);
	register_node_type_tex_translate(ttype);
	register_node_type_tex_scale(ttype);
	register_node_type_tex_at(ttype);
	
	register_node_type_tex_proc_voronoi(ttype);
	register_node_type_tex_proc_blend(ttype);
	register_node_type_tex_proc_magic(ttype);
	register_node_type_tex_proc_marble(ttype);
	register_node_type_tex_proc_clouds(ttype);
	register_node_type_tex_proc_wood(ttype);
	register_node_type_tex_proc_musgrave(ttype);
	register_node_type_tex_proc_noise(ttype);
	register_node_type_tex_proc_stucci(ttype);
	register_node_type_tex_proc_distnoise(ttype);
}

static void free_typeinfos(ListBase *list)
{
	bNodeType *ntype, *next;
	for (ntype = list->first; ntype; ntype = next) {
		next = ntype->next;

		if (ntype->needs_free)
			MEM_freeN(ntype);
	}
}

void init_nodesystem(void) 
{
	/* init clipboard */
	node_clipboard.nodes.first = node_clipboard.nodes.last = NULL;
	node_clipboard.links.first = node_clipboard.links.last = NULL;
	
	registerCompositNodes(ntreeGetType(NTREE_COMPOSIT));
	registerShaderNodes(ntreeGetType(NTREE_SHADER));
	registerTextureNodes(ntreeGetType(NTREE_TEXTURE));
}

void free_nodesystem(void) 
{
	free_typeinfos(&ntreeGetType(NTREE_COMPOSIT)->node_types);
	free_typeinfos(&ntreeGetType(NTREE_SHADER)->node_types);
	free_typeinfos(&ntreeGetType(NTREE_TEXTURE)->node_types);
}

/* called from BKE_scene_unlink, when deleting a scene goes over all scenes
 * other than the input, checks if they have render layer nodes referencing
 * the to-be-deleted scene, and resets them to NULL. */

/* XXX needs to get current scene then! */
void clear_scene_in_nodes(Main *bmain, Scene *sce)
{
	Scene *sce1;
	bNode *node;

	for (sce1 = bmain->scene.first; sce1; sce1 = sce1->id.next) {
		if (sce1 != sce) {
			if (sce1->nodetree) {
				for (node = sce1->nodetree->nodes.first; node; node = node->next) {
					if (node->type == CMP_NODE_R_LAYERS) {
						Scene *nodesce = (Scene *)node->id;
						
						if (nodesce == sce) node->id = NULL;
					}
				}
			}
		}
	}
}