test/source/blender/editors/space_node/node_templates.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.
 *
 * Contributor(s): Blender Foundation 2009.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/editors/space_node/node_templates.c
 *  \ingroup edinterface
 */

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

#include "MEM_guardedalloc.h"

#include "DNA_node_types.h"
#include "DNA_screen_types.h"

#include "BLI_array.h"
#include "BLI_listbase.h"
#include "BLI_string.h"

#include "BLT_translation.h"

#include "BKE_context.h"
#include "BKE_global.h"
#include "BKE_library.h"
#include "BKE_main.h"
#include "BKE_scene.h"

#include "RNA_access.h"

#include "NOD_socket.h"

#include "UI_interface.h"
#include "../interface/interface_intern.h"  /* XXX bad level */

#include "ED_node.h"  /* own include */

#include "ED_undo.h"


/************************* Node Socket Manipulation **************************/

/* describes an instance of a node type and a specific socket to link */
typedef struct NodeLinkItem {
	int socket_index;			/* index for linking */
	int socket_type;			/* socket type for compatibility check */
	const char *socket_name;	/* ui label of the socket */
	const char *node_name;		/* ui label of the node */
	
	/* extra settings */
	bNodeTree *ngroup;		/* group node tree */
} NodeLinkItem;

/* Compare an existing node to a link item to see if it can be reused.
 * item must be for the same node type!
 * XXX should become a node type callback
 */
static bool node_link_item_compare(bNode *node, NodeLinkItem *item)
{
	if (node->type == NODE_GROUP) {
		return (node->id == (ID *)item->ngroup);
	}
	else
		return true;
}

static void node_link_item_apply(bNode *node, NodeLinkItem *item)
{
	if (node->type == NODE_GROUP) {
		node->id = (ID *)item->ngroup;
		ntreeUpdateTree(G.main, item->ngroup);
	}
	else {
		/* nothing to do for now */
	}
	
	if (node->id)
		id_us_plus(node->id);
}

static void node_tag_recursive(bNode *node)
{
	bNodeSocket *input;

	if (!node || (node->flag & NODE_TEST))
		return;  /* in case of cycles */

	node->flag |= NODE_TEST;

	for (input = node->inputs.first; input; input = input->next)
		if (input->link)
			node_tag_recursive(input->link->fromnode);
}

static void node_clear_recursive(bNode *node)
{
	bNodeSocket *input;

	if (!node || !(node->flag & NODE_TEST))
		return;  /* in case of cycles */

	node->flag &= ~NODE_TEST;

	for (input = node->inputs.first; input; input = input->next)
		if (input->link)
			node_clear_recursive(input->link->fromnode);
}

static void node_remove_linked(bNodeTree *ntree, bNode *rem_node)
{
	bNode *node, *next;
	bNodeSocket *sock;

	if (!rem_node)
		return;

	/* tag linked nodes to be removed */
	for (node = ntree->nodes.first; node; node = node->next)
		node->flag &= ~NODE_TEST;

	node_tag_recursive(rem_node);

	/* clear tags on nodes that are still used by other nodes */
	for (node = ntree->nodes.first; node; node = node->next)
		if (!(node->flag & NODE_TEST))
			for (sock = node->inputs.first; sock; sock = sock->next)
				if (sock->link && sock->link->fromnode != rem_node)
					node_clear_recursive(sock->link->fromnode);

	/* remove nodes */
	for (node = ntree->nodes.first; node; node = next) {
		next = node->next;

		if (node->flag & NODE_TEST) {
			if (node->id)
				id_us_min(node->id);
			nodeFreeNode(ntree, node);
		}
	}
}

/* disconnect socket from the node it is connected to */
static void node_socket_disconnect(Main *bmain, bNodeTree *ntree, bNode *node_to, bNodeSocket *sock_to)
{
	if (!sock_to->link)
		return;

	nodeRemLink(ntree, sock_to->link);
	sock_to->flag |= SOCK_COLLAPSED;

	nodeUpdate(ntree, node_to);
	ntreeUpdateTree(bmain, ntree);

	ED_node_tag_update_nodetree(bmain, ntree, node_to);
}

/* remove all nodes connected to this socket, if they aren't connected to other nodes */
static void node_socket_remove(Main *bmain, bNodeTree *ntree, bNode *node_to, bNodeSocket *sock_to)
{
	if (!sock_to->link)
		return;

	node_remove_linked(ntree, sock_to->link->fromnode);
	sock_to->flag |= SOCK_COLLAPSED;

	nodeUpdate(ntree, node_to);
	ntreeUpdateTree(bmain, ntree);

	ED_node_tag_update_nodetree(bmain, ntree, node_to);
}

/* add new node connected to this socket, or replace an existing one */
static void node_socket_add_replace(const bContext *C, bNodeTree *ntree, bNode *node_to, bNodeSocket *sock_to,
                                    int type, NodeLinkItem *item)
{
	bNode *node_from;
	bNodeSocket *sock_from_tmp;
	bNode *node_prev = NULL;

	/* unlink existing node */
	if (sock_to->link) {
		node_prev = sock_to->link->fromnode;
		nodeRemLink(ntree, sock_to->link);
	}

	/* find existing node that we can use */
	for (node_from = ntree->nodes.first; node_from; node_from = node_from->next)
		if (node_from->type == type)
			break;

	if (node_from)
		if (node_from->inputs.first || node_from->typeinfo->draw_buttons || node_from->typeinfo->draw_buttons_ex)
			node_from = NULL;

	if (node_prev && node_prev->type == type && node_link_item_compare(node_prev, item)) {
		/* keep the previous node if it's the same type */
		node_from = node_prev;
	}
	else if (!node_from) {
		node_from = nodeAddStaticNode(C, ntree, type);
		if (node_prev != NULL) {
			/* If we're replacing existing node, use it's location. */
			node_from->locx = node_prev->locx;
			node_from->locy = node_prev->locy;
			node_from->offsetx = node_prev->offsetx;
			node_from->offsety = node_prev->offsety;
		}
		else {
			/* Avoid exact intersection of nodes.
			 * TODO(sergey): Still not ideal, but better than nothing.
			 */
			int index = BLI_findindex(&node_to->inputs, sock_to);
			BLI_assert(index != -1);
			node_from->locx = node_to->locx - (node_from->typeinfo->width + 50);
			node_from->locy = node_to->locy - (node_from->typeinfo->height * index);
		}
		
		node_link_item_apply(node_from, item);
	}

	nodeSetActive(ntree, node_from);

	/* add link */
	sock_from_tmp = BLI_findlink(&node_from->outputs, item->socket_index);
	nodeAddLink(ntree, node_from, sock_from_tmp, node_to, sock_to);
	sock_to->flag &= ~SOCK_COLLAPSED;

	/* copy input sockets from previous node */
	if (node_prev && node_from != node_prev) {
		bNodeSocket *sock_prev, *sock_from;

		for (sock_prev = node_prev->inputs.first; sock_prev; sock_prev = sock_prev->next) {
			for (sock_from = node_from->inputs.first; sock_from; sock_from = sock_from->next) {
				if (nodeCountSocketLinks(ntree, sock_from) >= sock_from->limit)
					continue;

				if (STREQ(sock_prev->name, sock_from->name) && sock_prev->type == sock_from->type) {
					bNodeLink *link = sock_prev->link;

					if (link && link->fromnode) {
						nodeAddLink(ntree, link->fromnode, link->fromsock, node_from, sock_from);
						nodeRemLink(ntree, link);
					}

					node_socket_copy_default_value(sock_from, sock_prev);
				}
			}
		}

		/* also preserve mapping for texture nodes */
		if (node_from->typeinfo->nclass == NODE_CLASS_TEXTURE &&
		    node_prev->typeinfo->nclass == NODE_CLASS_TEXTURE)
		{
			memcpy(node_from->storage, node_prev->storage, sizeof(NodeTexBase));
		}

		/* remove node */
		node_remove_linked(ntree, node_prev);
	}

	nodeUpdate(ntree, node_from);
	nodeUpdate(ntree, node_to);
	ntreeUpdateTree(CTX_data_main(C), ntree);

	ED_node_tag_update_nodetree(CTX_data_main(C), ntree, node_to);
}

/****************************** Node Link Menu *******************************/

// #define UI_NODE_LINK_ADD        0
#define UI_NODE_LINK_DISCONNECT -1
#define UI_NODE_LINK_REMOVE     -2

typedef struct NodeLinkArg {
	Main *bmain;
	Scene *scene;
	bNodeTree *ntree;
	bNode *node;
	bNodeSocket *sock;

	bNodeType *node_type;
	NodeLinkItem item;

	uiLayout *layout;
} NodeLinkArg;

static void ui_node_link_items(NodeLinkArg *arg, int in_out, NodeLinkItem **r_items, int *r_totitems)
{
	/* XXX this should become a callback for node types! */
	NodeLinkItem *items = NULL;
	int totitems = 0;
	
	if (arg->node_type->type == NODE_GROUP) {
		bNodeTree *ngroup;
		int i;
		
		for (ngroup = arg->bmain->nodetree.first; ngroup; ngroup = ngroup->id.next) {
			ListBase *lb = ((in_out == SOCK_IN) ? &ngroup->inputs : &ngroup->outputs);
			totitems += BLI_listbase_count(lb);
		}
		
		if (totitems > 0) {
			items = MEM_callocN(sizeof(NodeLinkItem) * totitems, "ui node link items");
			
			i = 0;
			for (ngroup = arg->bmain->nodetree.first; ngroup; ngroup = ngroup->id.next) {
				ListBase *lb = (in_out == SOCK_IN ? &ngroup->inputs : &ngroup->outputs);
				bNodeSocket *stemp;
				int index;
				for (stemp = lb->first, index = 0; stemp; stemp = stemp->next, ++index, ++i) {
					NodeLinkItem *item = &items[i];
					
					item->socket_index = index;
					/* note: int stemp->type is not fully reliable, not used for node group
					 * interface sockets. use the typeinfo->type instead.
					 */
					item->socket_type = stemp->typeinfo->type;
					item->socket_name = stemp->name;
					item->node_name = ngroup->id.name + 2;
					item->ngroup = ngroup;
				}
			}
		}
	}
	else {
		bNodeSocketTemplate *socket_templates = (in_out == SOCK_IN ? arg->node_type->inputs : arg->node_type->outputs);
		bNodeSocketTemplate *stemp;
		int i;
		
		for (stemp = socket_templates; stemp && stemp->type != -1; ++stemp)
			++totitems;
		
		if (totitems > 0) {
			items = MEM_callocN(sizeof(NodeLinkItem) * totitems, "ui node link items");
			
			i = 0;
			for (stemp = socket_templates; stemp && stemp->type != -1; ++stemp, ++i) {
				NodeLinkItem *item = &items[i];
				
				item->socket_index = i;
				item->socket_type = stemp->type;
				item->socket_name = stemp->name;
				item->node_name = arg->node_type->ui_name;
			}
		}
	}
	
	*r_items = items;
	*r_totitems = totitems;
}

static void ui_node_link(bContext *C, void *arg_p, void *event_p)
{
	NodeLinkArg *arg = (NodeLinkArg *)arg_p;
	Main *bmain = arg->bmain;
	bNode *node_to = arg->node;
	bNodeSocket *sock_to = arg->sock;
	bNodeTree *ntree = arg->ntree;
	int event = GET_INT_FROM_POINTER(event_p);

	if (event == UI_NODE_LINK_DISCONNECT)
		node_socket_disconnect(bmain, ntree, node_to, sock_to);
	else if (event == UI_NODE_LINK_REMOVE)
		node_socket_remove(bmain, ntree, node_to, sock_to);
	else
		node_socket_add_replace(C, ntree, node_to, sock_to, arg->node_type->type, &arg->item);

	ED_undo_push(C, "Node input modify");
}

static void ui_node_sock_name(bNodeTree *ntree, bNodeSocket *sock, char name[UI_MAX_NAME_STR])
{
	if (sock->link && sock->link->fromnode) {
		bNode *node = sock->link->fromnode;
		char node_name[UI_MAX_NAME_STR];

		nodeLabel(ntree, node, node_name, sizeof(node_name));

		if (BLI_listbase_is_empty(&node->inputs) &&
		    node->outputs.first != node->outputs.last)
		{
			BLI_snprintf(name, UI_MAX_NAME_STR, "%s | %s", IFACE_(node_name), IFACE_(sock->link->fromsock->name));
		}
		else {
			BLI_strncpy(name, IFACE_(node_name), UI_MAX_NAME_STR);
		}
	}
	else if (sock->type == SOCK_SHADER)
		BLI_strncpy(name, IFACE_("None"), UI_MAX_NAME_STR);
	else
		BLI_strncpy(name, IFACE_("Default"), UI_MAX_NAME_STR);
}

static int ui_compatible_sockets(int typeA, int typeB)
{
	return (typeA == typeB);
}

static int ui_node_item_name_compare(const void *a, const void *b)
{
	const bNodeType *type_a = *(const bNodeType **)a;
	const bNodeType *type_b = *(const bNodeType **)b;
	return BLI_natstrcmp(type_a->ui_name, type_b->ui_name);
}

static bool ui_node_item_special_poll(const bNodeTree *UNUSED(ntree),
                                      const bNodeType *ntype)
{
	if (STREQ(ntype->idname, "ShaderNodeUVAlongStroke")) {
		/* TODO(sergey): Currently we don't have Freestyle nodes edited from
		 * the buttons context, so can ignore it's nodes completely.
		 *
		 * However, we might want to do some extra checks here later.
		 */
		return false;
	}
	return true;
}

static void ui_node_menu_column(NodeLinkArg *arg, int nclass, const char *cname)
{
	bNodeTree *ntree = arg->ntree;
	bNodeSocket *sock = arg->sock;
	uiLayout *layout = arg->layout;
	uiLayout *column = NULL;
	uiBlock *block = uiLayoutGetBlock(layout);
	uiBut *but;
	NodeLinkArg *argN;
	int first = 1;
	int compatibility = 0;
	
	if (ntree->type == NTREE_SHADER) {
		compatibility = NODE_NEW_SHADING;
	}

	/* generate array of node types sorted by UI name */
	bNodeType **sorted_ntypes = NULL;
	BLI_array_declare(sorted_ntypes);

	NODE_TYPES_BEGIN(ntype) {
		if (compatibility && !(ntype->compatibility & compatibility)) {
			continue;
		}

		if (ntype->nclass != nclass) {
			continue;
		}

		if (!ui_node_item_special_poll(ntree, ntype)) {
			continue;
		}

		BLI_array_append(sorted_ntypes, ntype);
	}
	NODE_TYPES_END

	qsort(sorted_ntypes, BLI_array_len(sorted_ntypes), sizeof(bNodeType *), ui_node_item_name_compare);

	/* generate UI */
	for (int j = 0; j < BLI_array_len(sorted_ntypes); j++) {
		bNodeType *ntype = sorted_ntypes[j];
		NodeLinkItem *items;
		int totitems;
		char name[UI_MAX_NAME_STR];
		const char *cur_node_name = NULL;
		int i, num = 0;
		int icon = ICON_NONE;
		
		arg->node_type = ntype;
		
		ui_node_link_items(arg, SOCK_OUT, &items, &totitems);
		
		for (i = 0; i < totitems; ++i)
			if (ui_compatible_sockets(items[i].socket_type, sock->type))
				num++;
		
		for (i = 0; i < totitems; ++i) {
			if (!ui_compatible_sockets(items[i].socket_type, sock->type))
				continue;
			
			if (first) {
				column = uiLayoutColumn(layout, 0);
				UI_block_layout_set_current(block, column);
				
				uiItemL(column, IFACE_(cname), ICON_NODE);
				but = block->buttons.last;
				
				first = 0;
			}
			
			if (num > 1) {
				if (!cur_node_name || !STREQ(cur_node_name, items[i].node_name)) {
					cur_node_name = items[i].node_name;
					/* XXX Do not use uiItemL here, it would add an empty icon as we are in a menu! */
					uiDefBut(block, UI_BTYPE_LABEL, 0, IFACE_(cur_node_name), 0, 0, UI_UNIT_X * 4, UI_UNIT_Y,
					         NULL, 0.0, 0.0, 0.0, 0.0, "");
				}

				BLI_snprintf(name, UI_MAX_NAME_STR, "%s", IFACE_(items[i].socket_name));
				icon = ICON_BLANK1;
			}
			else {
				BLI_strncpy(name, IFACE_(items[i].node_name), UI_MAX_NAME_STR);
				icon = ICON_NONE;
			}
			
			but = uiDefIconTextBut(block, UI_BTYPE_BUT, 0, icon, name, 0, 0, UI_UNIT_X * 4, UI_UNIT_Y,
			                       NULL, 0.0, 0.0, 0.0, 0.0, TIP_("Add node to input"));
			
			argN = MEM_dupallocN(arg);
			argN->item = items[i];
			UI_but_funcN_set(but, ui_node_link, argN, NULL);
		}
		
		if (items)
			MEM_freeN(items);
	}

	BLI_array_free(sorted_ntypes);
}

static void node_menu_column_foreach_cb(void *calldata, int nclass, const char *name)
{
	NodeLinkArg *arg = (NodeLinkArg *)calldata;

	if (!ELEM(nclass, NODE_CLASS_GROUP, NODE_CLASS_LAYOUT))
		ui_node_menu_column(arg, nclass, name);
}

static void ui_template_node_link_menu(bContext *C, uiLayout *layout, void *but_p)
{
	Main *bmain = CTX_data_main(C);
	Scene *scene = CTX_data_scene(C);
	uiBlock *block = uiLayoutGetBlock(layout);
	uiBut *but = (uiBut *)but_p;
	uiLayout *split, *column;
	NodeLinkArg *arg = (NodeLinkArg *)but->func_argN;
	bNodeSocket *sock = arg->sock;
	bNodeTreeType *ntreetype = arg->ntree->typeinfo;

	UI_block_flag_enable(block, UI_BLOCK_NO_FLIP | UI_BLOCK_IS_FLIP);
	UI_block_layout_set_current(block, layout);
	split = uiLayoutSplit(layout, 0.0f, false);

	arg->bmain = bmain;
	arg->scene = scene;
	arg->layout = split;

	if (ntreetype && ntreetype->foreach_nodeclass)
		ntreetype->foreach_nodeclass(scene, arg, node_menu_column_foreach_cb);

	column = uiLayoutColumn(split, false);
	UI_block_layout_set_current(block, column);

	if (sock->link) {
		uiItemL(column, IFACE_("Link"), ICON_NONE);
		but = block->buttons.last;
		but->drawflag = UI_BUT_TEXT_LEFT;

		but = uiDefBut(block, UI_BTYPE_BUT, 0, IFACE_("Remove"), 0, 0, UI_UNIT_X * 4, UI_UNIT_Y,
		               NULL, 0.0, 0.0, 0.0, 0.0, TIP_("Remove nodes connected to the input"));
		UI_but_funcN_set(but, ui_node_link, MEM_dupallocN(arg), SET_INT_IN_POINTER(UI_NODE_LINK_REMOVE));

		but = uiDefBut(block, UI_BTYPE_BUT, 0, IFACE_("Disconnect"), 0, 0, UI_UNIT_X * 4, UI_UNIT_Y,
		               NULL, 0.0, 0.0, 0.0, 0.0, TIP_("Disconnect nodes connected to the input"));
		UI_but_funcN_set(but, ui_node_link, MEM_dupallocN(arg), SET_INT_IN_POINTER(UI_NODE_LINK_DISCONNECT));
	}

	ui_node_menu_column(arg, NODE_CLASS_GROUP, N_("Group"));
}

void uiTemplateNodeLink(uiLayout *layout, bNodeTree *ntree, bNode *node, bNodeSocket *sock)
{
	uiBlock *block = uiLayoutGetBlock(layout);
	NodeLinkArg *arg;
	uiBut *but;

	arg = MEM_callocN(sizeof(NodeLinkArg), "NodeLinkArg");
	arg->ntree = ntree;
	arg->node = node;
	arg->sock = sock;

	UI_block_layout_set_current(block, layout);

	if (sock->link || sock->type == SOCK_SHADER || (sock->flag & SOCK_HIDE_VALUE)) {
		char name[UI_MAX_NAME_STR];
		ui_node_sock_name(ntree, sock, name);
		but = uiDefMenuBut(block, ui_template_node_link_menu, NULL, name, 0, 0, UI_UNIT_X * 4, UI_UNIT_Y, "");
	}
	else
		but = uiDefIconMenuBut(block, ui_template_node_link_menu, NULL, ICON_NONE, 0, 0, UI_UNIT_X, UI_UNIT_Y, "");

	UI_but_type_set_menu_from_pulldown(but);

	but->flag |= UI_BUT_NODE_LINK;
	but->poin = (char *)but;
	but->func_argN = arg;

	if (sock->link && sock->link->fromnode)
		if (sock->link->fromnode->flag & NODE_ACTIVE_TEXTURE)
			but->flag |= UI_BUT_NODE_ACTIVE;
}

/**************************** Node Tree Layout *******************************/

static void ui_node_draw_input(uiLayout *layout, bContext *C,
                               bNodeTree *ntree, bNode *node, bNodeSocket *input, int depth);

static void ui_node_draw_node(uiLayout *layout, bContext *C, bNodeTree *ntree, bNode *node, int depth)
{
	bNodeSocket *input;
	uiLayout *col, *split;
	PointerRNA nodeptr;

	RNA_pointer_create(&ntree->id, &RNA_Node, node, &nodeptr);

	if (node->typeinfo->draw_buttons) {
		if (node->type != NODE_GROUP) {
			split = uiLayoutSplit(layout, 0.35f, false);
			col = uiLayoutColumn(split, false);
			col = uiLayoutColumn(split, false);

			node->typeinfo->draw_buttons(col, C, &nodeptr);
		}
	}

	for (input = node->inputs.first; input; input = input->next)
		ui_node_draw_input(layout, C, ntree, node, input, depth + 1);
}

static void ui_node_draw_input(uiLayout *layout, bContext *C, bNodeTree *ntree, bNode *node, bNodeSocket *input, int depth)
{
	PointerRNA inputptr, nodeptr;
	uiBlock *block = uiLayoutGetBlock(layout);
	uiBut *bt;
	uiLayout *split, *row, *col;
	bNode *lnode;
	char label[UI_MAX_NAME_STR];
	int i, indent = (depth > 1) ? 2 * (depth - 1) : 0;
	int dependency_loop;

	if (input->flag & SOCK_UNAVAIL)
		return;

	/* to avoid eternal loops on cyclic dependencies */
	node->flag |= NODE_TEST;
	lnode = (input->link) ? input->link->fromnode : NULL;

	dependency_loop = (lnode && (lnode->flag & NODE_TEST));
	if (dependency_loop)
		lnode = NULL;

	/* socket RNA pointer */
	RNA_pointer_create(&ntree->id, &RNA_NodeSocket, input, &inputptr);
	RNA_pointer_create(&ntree->id, &RNA_Node, node, &nodeptr);

	/* indented label */
	for (i = 0; i < indent; i++) {
		label[i] = ' ';
	}
	label[indent] = '\0';
	BLI_snprintf(label + indent, UI_MAX_NAME_STR - indent, "%s:", IFACE_(input->name));

	/* split in label and value */
	split = uiLayoutSplit(layout, 0.35f, false);

	row = uiLayoutRow(split, true);

	if (depth > 0) {
		UI_block_emboss_set(block, UI_EMBOSS_NONE);

		if (lnode && (lnode->inputs.first || (lnode->typeinfo->draw_buttons && lnode->type != NODE_GROUP))) {
			int icon = (input->flag & SOCK_COLLAPSED) ? ICON_DISCLOSURE_TRI_RIGHT : ICON_DISCLOSURE_TRI_DOWN;
			uiItemR(row, &inputptr, "show_expanded", UI_ITEM_R_ICON_ONLY, "", icon);
		}
		else
			uiItemL(row, "", ICON_BLANK1);

		bt = block->buttons.last;
		bt->rect.xmax = UI_UNIT_X / 2;

		UI_block_emboss_set(block, UI_EMBOSS);
	}

	uiItemL(row, label, ICON_NONE);
	bt = block->buttons.last;
	bt->drawflag = UI_BUT_TEXT_LEFT;

	if (dependency_loop) {
		row = uiLayoutRow(split, false);
		uiItemL(row, IFACE_("Dependency Loop"), ICON_ERROR);
	}
	else if (lnode) {
		/* input linked to a node */
		uiTemplateNodeLink(split, ntree, node, input);

		if (depth == 0 || !(input->flag & SOCK_COLLAPSED)) {
			if (depth == 0)
				uiItemS(layout);

			ui_node_draw_node(layout, C, ntree, lnode, depth);
		}
	}
	else {
		/* input not linked, show value */
		if (!(input->flag & SOCK_HIDE_VALUE)) {
			switch (input->type) {
				case SOCK_FLOAT:
				case SOCK_INT:
				case SOCK_BOOLEAN:
				case SOCK_RGBA:
				case SOCK_STRING:
					row = uiLayoutRow(split, true);
					uiItemR(row, &inputptr, "default_value", 0, "", ICON_NONE);
					break;
				case SOCK_VECTOR:
					row = uiLayoutRow(split, false);
					col = uiLayoutColumn(row, false);
					uiItemR(col, &inputptr, "default_value", 0, "", ICON_NONE);
					break;
					
				default:
					row = uiLayoutRow(split, false);
					break;
			}
		}
		else
			row = uiLayoutRow(split, false);

		uiTemplateNodeLink(row, ntree, node, input);
	}

	/* clear */
	node->flag &= ~NODE_TEST;
}

void uiTemplateNodeView(uiLayout *layout, bContext *C, bNodeTree *ntree, bNode *node, bNodeSocket *input)
{
	bNode *tnode;

	if (!ntree)
		return;

	/* clear for cycle check */
	for (tnode = ntree->nodes.first; tnode; tnode = tnode->next)
		tnode->flag &= ~NODE_TEST;

	if (input)
		ui_node_draw_input(layout, C, ntree, node, input, 0);
	else
		ui_node_draw_node(layout, C, ntree, node, 0);
}