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/*************************************************************************
* Copyright (C) 2009-2010 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension 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 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension 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 program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
#include "dimension.h"
#include <stdlib.h>
/* Allocate a dummy object */
dmnsn_object *
dmnsn_new_object()
{
dmnsn_object *object = dmnsn_malloc(sizeof(dmnsn_object));
object->texture = NULL;
object->interior = NULL;
object->trans = dmnsn_identity_matrix();
object->children = dmnsn_new_array(sizeof(dmnsn_object *));
object->init_fn = NULL;
object->free_fn = NULL;
return object;
}
/* Free a dummy object */
void
dmnsn_delete_object(dmnsn_object *object)
{
if (object) {
DMNSN_ARRAY_FOREACH (dmnsn_object **, child, object->children) {
dmnsn_delete_object(*child);
}
dmnsn_delete_array(object->children);
dmnsn_delete_interior(object->interior);
dmnsn_delete_texture(object->texture);
if (object->free_fn) {
(*object->free_fn)(object->ptr);
}
dmnsn_free(object);
}
}
/* Precompute object properties */
void
dmnsn_object_init(dmnsn_object *object)
{
if (object->init_fn) {
(*object->init_fn)(object);
}
object->bounding_box
= dmnsn_transform_bounding_box(object->trans, object->bounding_box);
object->trans_inv = dmnsn_matrix_inverse(object->trans);
if (object->texture) {
object->texture->trans
= dmnsn_matrix_mul(object->trans, object->texture->trans);
dmnsn_texture_init(object->texture);
}
}
/* Helper function to transform a normal vector */
static inline dmnsn_vector
dmnsn_transform_normal(dmnsn_matrix trans, dmnsn_vector normal)
{
return dmnsn_vector_normalize(
dmnsn_vector_sub(
dmnsn_transform_vector(trans, normal),
/* Optimized form of dmnsn_transform_vector(trans, dmnsn_zero) */
dmnsn_vector_div(
dmnsn_new_vector(trans.n[0][3], trans.n[1][3], trans.n[2][3]),
trans.n[3][3]
)
)
);
}
bool
dmnsn_object_intersection(const dmnsn_object *object, dmnsn_line line,
dmnsn_intersection *intersection)
{
dmnsn_line line_trans = dmnsn_transform_line(object->trans_inv, line);
if ((*object->intersection_fn)(object, line_trans, intersection)) {
/* Get us back into world coordinates */
intersection->ray = line;
intersection->normal = dmnsn_transform_normal(object->trans,
intersection->normal);
return true;
} else {
return false;
}
}
bool
dmnsn_object_inside(const dmnsn_object *object, dmnsn_vector point)
{
point = dmnsn_transform_vector(object->trans_inv, point);
return (*object->inside_fn)(object, point);
}
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