blob: 36c724a7679b94d62963cb0283e8cb61726205cb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
/*************************************************************************
* Copyright (C) 2009-2010 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
* Lights.
*/
#include <stdbool.h>
/* Forward-declar dmnsn_light */
typedef struct dmnsn_light dmnsn_light;
/**
* Light direction callback.
* @param[in] light The light itself.
* @param[in] v The point to illuminate.
* @return The direction of light rays pointing from \p v
*/
typedef dmnsn_vector dmnsn_light_direction_fn(const dmnsn_light *light,
dmnsn_vector v);
/**
* Light illumination callback.
* @param[in] light The light itself.
* @param[in] v The point to illuminate.
* @return The color of the light at \p v.
*/
typedef dmnsn_color dmnsn_light_illumination_fn(const dmnsn_light *light,
dmnsn_vector v);
/**
* Light shadow callback.
* @param[in] light The light itself.
* @param[in] t The line index of the closest shadow ray intersection.
* @return Whether the point is in shadow.
*/
typedef bool dmnsn_light_shadow_fn(const dmnsn_light *light, double t);
/** A light. */
struct dmnsn_light {
/* Callbacks */
dmnsn_light_direction_fn *direction_fn; /**< Direction callback. */
dmnsn_light_illumination_fn *illumination_fn; /**< Illumination callback. */
dmnsn_light_shadow_fn *shadow_fn; /**< Shadow callback. */
dmnsn_free_fn *free_fn; /**< Desctructor callback. */
/** Generic pointer for light info. */
void *ptr;
/** @internal Reference count. */
dmnsn_refcount refcount;
};
/**
* Create a dummy light.
* @return The allocated light.
*/
dmnsn_light *dmnsn_new_light(void);
/**
* Delete a light.
* @param[in,out] light The light to delete.
*/
void dmnsn_delete_light(dmnsn_light *light);
|
