/*
 * $Id$
 *
 * ***** 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) 2006 Blender Foundation.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/nodes/intern/CMP_nodes/CMP_normal.c
 *  \ingroup cmpnodes
 */


#include "../CMP_util.h"


/* **************** NORMAL  ******************** */
static bNodeSocketType cmp_node_normal_in[]= {
	{	SOCK_VECTOR, 1, "Normal",	0.0f, 0.0f, 0.0f, 1.0f, -1.0f, 1.0f},
	{	-1, 0, ""	}
};

static bNodeSocketType cmp_node_normal_out[]= {
	{	SOCK_VECTOR, 0, "Normal",	0.0f, 0.0f, 1.0f, 1.0f, -1.0f, 1.0f},
	{	SOCK_VALUE, 0, "Dot",		1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
	{	-1, 0, ""	}
};

static void do_normal(bNode *node, float *out, float *in)
{
	bNodeSocket *sock= node->outputs.first;
	float *nor= sock->ns.vec;
	
	/* render normals point inside... the widget points outside */
	out[0]= -INPR(nor, in);
}

/* generates normal, does dot product */
static void node_composit_exec_normal(void *UNUSED(data), bNode *node, bNodeStack **in, bNodeStack **out)
{
	bNodeSocket *sock= node->outputs.first;
	/* stack order input:  normal */
	/* stack order output: normal, value */
	
	/* input no image? then only vector op */
	if(in[0]->data==NULL) {
		VECCOPY(out[0]->vec, sock->ns.vec);
		/* render normals point inside... the widget points outside */
		out[1]->vec[0]= -INPR(out[0]->vec, in[0]->vec);
	}
	else if(out[1]->hasoutput) {
		/* make output size of input image */
		CompBuf *cbuf= in[0]->data;
		CompBuf *stackbuf= alloc_compbuf(cbuf->x, cbuf->y, CB_VAL, 1); /* allocs */
		
		composit1_pixel_processor(node, stackbuf, in[0]->data, in[0]->vec, do_normal, CB_VEC3);
		
		out[1]->data= stackbuf;
	}
	
	
}

void register_node_type_cmp_normal(ListBase *lb)
{
	static bNodeType ntype;

	node_type_base(&ntype, CMP_NODE_NORMAL, "Normal", NODE_CLASS_OP_VECTOR, NODE_OPTIONS,
		cmp_node_normal_in, cmp_node_normal_out);
	node_type_size(&ntype, 100, 60, 200);
	node_type_exec(&ntype, node_composit_exec_normal);

	nodeRegisterType(lb, &ntype);
}