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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
* Cameras.
*/
/* Forward-declare dmnsn_camera */
typedef struct dmnsn_camera dmnsn_camera;
/**
* Camera ray callback.
* @param[in] camera The camera itself.
* @param[in] x The x coordinate of the pixel (in [0, 1]).
* @param[in] y The y coordinate of the pixel (in [0, 1]).
* @return The ray through (\p x, \p y).
*/
typedef dmnsn_line dmnsn_camera_ray_fn(const dmnsn_camera *camera,
double x, double y);
/**
* Camera destruction callback.
* @param[in,out] camera The camera to delete.
*/
typedef void dmnsn_camera_free_fn(dmnsn_camera *camera);
/** A camera. */
struct dmnsn_camera {
/* Callback functions */
dmnsn_camera_ray_fn *ray_fn; /**< Camera ray callback. */
dmnsn_camera_free_fn *free_fn; /**< Destructor callback. */
dmnsn_matrix trans; /**< Transformation matrix. */
DMNSN_REFCOUNT; /**< Reference count. */
};
/**
* Create a dummy camera.
* @return The allocated camera.
*/
dmnsn_camera *dmnsn_new_camera(void);
/**
* Initialize a dmnsn_camera field.
* @param[out] camera The camera to initialize.
*/
void dmnsn_init_camera(dmnsn_camera *camera);
/**
* Delete a camera.
* @param[in,out] camera The camera to delete.
*/
void dmnsn_delete_camera(dmnsn_camera *camera);
/**
* Invoke the camera ray callback, then correctly transform the ray.
* @param[in] camera The camera itself.
* @param[in] x The x coordinate of the pixel (in [0, 1]).
* @param[in] y The y coordinate of the pixel (in [0, 1]).
* @return The ray through (\p x, \p y).
*/
dmnsn_line dmnsn_camera_ray(const dmnsn_camera *camera, double x, double y);
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