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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/>. *
*************************************************************************/
/*
* Objects.
*/
#ifndef DIMENSION_OBJECT_H
#define DIMENSION_OBJECT_H
#include <stdbool.h>
/* A type to represent a ray-object intersection */
typedef struct dmnsn_intersection {
/* The ray and point which intersected */
dmnsn_line ray;
double t;
/* The surface normal at the intersection point */
dmnsn_vector normal;
/* The object properties at the intersection point */
const dmnsn_texture *texture;
const dmnsn_interior *interior;
} dmnsn_intersection;
dmnsn_vector dmnsn_transform_normal(dmnsn_matrix trans, dmnsn_vector normal);
/* Forward-declare dmnsn_object */
typedef struct dmnsn_object dmnsn_object;
/* Object callback types */
typedef void dmnsn_object_precompute_fn(dmnsn_object *object);
typedef bool dmnsn_object_intersection_fn(const dmnsn_object *object,
dmnsn_line line,
dmnsn_intersection *intersection);
typedef bool dmnsn_object_inside_fn(const dmnsn_object *object,
dmnsn_vector point);
/* dmnsn_object definition */
struct dmnsn_object {
/* Surface properties */
dmnsn_texture *texture;
/* Interior properties */
dmnsn_interior *interior;
/* Transformation matrix */
dmnsn_matrix trans, trans_inv;
/* Bounding box */
dmnsn_bounding_box bounding_box;
/* Callback functions */
dmnsn_object_precompute_fn *precompute_fn;
dmnsn_object_intersection_fn *intersection_fn;
dmnsn_object_inside_fn *inside_fn;
dmnsn_free_fn *free_fn;
/* Generic pointer for object info */
void *ptr;
};
/* Allocate a dummy object */
dmnsn_object *dmnsn_new_object();
/* Free an object */
void dmnsn_delete_object(dmnsn_object *object);
void dmnsn_object_precompute(dmnsn_object *object);
#endif /* DIMENSION_OBJECT_H */
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