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/* $Id$ */
/*
libg3d - 3D object loading library
Copyright (C) 2005-2009 Markus Dahms <mad@automagically.de>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <g3d/types.h>
#include <g3d/vector.h>
#define VERTEX_ITEM(a, b) \
object->vertex_data[face->vertex_indices[a] * 3 + (b)]
EAPI
void g3d_face_free(G3DFace *face)
{
if(face->vertex_indices)
g_free(face->vertex_indices);
g_free(face);
}
EAPI
gboolean g3d_face_get_normal(G3DFace *face, G3DObject *object,
G3DVector *nx, G3DVector *ny, G3DVector *nz)
{
guint32 n = face->vertex_count - 1;
return g3d_vector_normal(
/* ax, ay, az */
VERTEX_ITEM(1, 0) - VERTEX_ITEM(0, 0),
VERTEX_ITEM(1, 1) - VERTEX_ITEM(0, 1),
VERTEX_ITEM(1, 2) - VERTEX_ITEM(0, 2),
/* bx, by, bz */
VERTEX_ITEM(n, 0) - VERTEX_ITEM(0, 0),
VERTEX_ITEM(n, 1) - VERTEX_ITEM(0, 1),
VERTEX_ITEM(n, 2) - VERTEX_ITEM(0, 2),
/* nx, ny, nz */
nx, ny, nz);
}
#undef VERTEX_ITEM
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