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/*************************************************************************
* Copyright (C) 2009-2014 Tavian Barnes <tavianator@tavianator.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/>. *
*************************************************************************/
/**
* @file
* Objects.
*/
#include "dimension-internal.h"
#include <stdlib.h>
/* Allocate a dummy object */
dmnsn_object *
dmnsn_new_object(dmnsn_pool *pool)
{
dmnsn_object *object = DMNSN_PALLOC(pool, dmnsn_object);
dmnsn_init_object(object);
return object;
}
/* Initialize a dmnsn_object field */
void
dmnsn_init_object(dmnsn_object *object)
{
object->vtable = NULL;
object->texture = NULL;
object->interior = NULL;
object->trans = dmnsn_identity_matrix();
object->intrinsic_trans = dmnsn_identity_matrix();
object->children = NULL;
object->split_children = false;
object->precomputed = false;
}
/** Recursively precompute objects. */
static void
dmnsn_object_precompute_recursive(dmnsn_object *object, dmnsn_matrix pigment_trans)
{
dmnsn_assert(!object->precomputed, "Object double-precomputed.");
object->precomputed = true;
const dmnsn_object_vtable *vtable = object->vtable;
dmnsn_assert(vtable->intersection_fn, "Missing intersection function.");
dmnsn_assert(vtable->inside_fn, "Missing inside function.");
dmnsn_assert(vtable->bounding_fn || vtable->precompute_fn, "Missing bounding and precompute function.");
/* Initialize the texture */
if (!object->texture->initialized) {
dmnsn_texture_initialize(object->texture);
}
dmnsn_matrix total_trans = dmnsn_matrix_mul(object->trans, object->intrinsic_trans);
/* Precompute the object's children */
if (object->children) {
DMNSN_ARRAY_FOREACH (dmnsn_object **, child, object->children) {
dmnsn_matrix saved_trans = (*child)->trans;
(*child)->trans = dmnsn_matrix_mul(total_trans, saved_trans);
dmnsn_matrix child_pigment_trans;
if ((*child)->texture == NULL || (*child)->texture->pigment == NULL) {
/* Don't transform cascaded pigments with the child object */
child_pigment_trans = pigment_trans;
} else {
child_pigment_trans = dmnsn_matrix_inverse((*child)->trans);
}
dmnsn_texture_cascade(object->texture, &(*child)->texture);
dmnsn_interior_cascade(object->interior, &(*child)->interior);
dmnsn_object_precompute_recursive(*child, child_pigment_trans);
(*child)->trans = saved_trans;
}
}
/* Precalculate object values */
object->pigment_trans = pigment_trans;
object->trans_inv = dmnsn_matrix_inverse(total_trans);
if (vtable->bounding_fn) {
object->bounding_box = vtable->bounding_fn(object, total_trans);
}
if (vtable->precompute_fn) {
vtable->precompute_fn(object);
}
}
/* Precompute object properties */
void
dmnsn_object_precompute(dmnsn_object *object)
{
dmnsn_matrix pigment_trans = dmnsn_matrix_inverse(object->trans);
dmnsn_object_precompute_recursive(object, pigment_trans);
}
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