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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/>.                                       *
 *************************************************************************/

/**
 * @file
 * Objects.
 */

#ifndef DIMENSION_OBJECT_H
#define DIMENSION_OBJECT_H

#include <stdbool.h>

/** A type to represent a ray-object intersection. */
typedef struct dmnsn_intersection {
  dmnsn_line ray; /**< The ray that intersected. */
  double t;       /**< The line index that intersected */

  dmnsn_vector normal; /**< The surface normal at the intersection point */

  const dmnsn_texture  *texture;  /**< The texture at the intersection point */
  const dmnsn_interior *interior; /**< The interior at the intersection point */
} dmnsn_intersection;

/* Forward-declare dmnsn_object */
typedef struct dmnsn_object dmnsn_object;

/**
 * Object initialization callback.
 * @param[in,out] object  The object to initialize.
 */
typedef void dmnsn_object_init_fn(dmnsn_object *object);

/**
 * Ray-object intersection callback.
 * @param[in]  object        The object to test.
 * @param[in]  line          The line to test.
 * @param[out] intersection  Where to store the intersection details of the
 *                           closest (if any) intersection.
 * @return Whether \p line intersected \p object.
 */
typedef bool dmnsn_object_intersection_fn(const dmnsn_object *object,
                                          dmnsn_line line,
                                          dmnsn_intersection *intersection);

/**
 * Object inside callback.
 * @param[in] object  The object to test.
 * @param[in] point   The point to test.
 * @return Whether \p point is inside \p object.
 */
typedef bool dmnsn_object_inside_fn(const dmnsn_object *object,
                                    dmnsn_vector point);

/** An object. */
struct dmnsn_object {
  dmnsn_texture *texture;   /**< Surface properties */
  dmnsn_interior *interior; /**< Interior properties */

  dmnsn_matrix trans;     /**< Transformation matrix */
  dmnsn_matrix trans_inv; /**< Inverse of the transformation matrix */

  dmnsn_bounding_box bounding_box; /**< Object bounding box */

  /** Child objects.  This array lists objects that can be split into
      sub-objects for bounding purposes (for unions and meshes, for example). */
  dmnsn_array *children;

  dmnsn_object_init_fn         *init_fn; /**< Initialization callback. */
  dmnsn_object_intersection_fn *intersection_fn; /**< Intersection callback. */
  dmnsn_object_inside_fn       *inside_fn; /**< Inside callback. */
  dmnsn_free_fn                *free_fn; /**< Destruction callback. */

  /** Generic pointer for object info */
  void *ptr;
};

/**
 * Allocate a dummy object.
 * @return The allocated object.
 */
dmnsn_object *dmnsn_new_object(void);

/**
 * Free an object
 * @param[in,out] object  The object to destroy.
 */
void dmnsn_delete_object(dmnsn_object *object);

/**
 * Initialize an object and potentially its children.
 * @param[in,out] object  The object to initialize.
 */
void dmnsn_object_init(dmnsn_object *object);

/**
 * Appropriately transform a ray, then test for an intersection.
 * @param[in]  object        The object to test.
 * @param[in]  line          The ray to test.
 * @param[out] intersection  Where to store the intersection details.
 * @return Whether there was an intersection.
 */
bool dmnsn_object_intersection(const dmnsn_object *object, dmnsn_line line,
                               dmnsn_intersection *intersection);

/**
 * Appropriately transform a point, then test for containment.
 * @param[in] object  The object to test.
 * @param[in] point   The point to test.
 * @return Whether \p point was inside \p object.
 */
bool dmnsn_object_inside(const dmnsn_object *object, dmnsn_vector point);

#endif /* DIMENSION_OBJECT_H */