summaryrefslogtreecommitdiff
path: root/src/light.h
blob: c1af7fa62dcee09929b013a3cc2da3d21e9ca52f (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
83
84
85
86
87
88
89
90
/*
Minetest-c55
Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#ifndef LIGHT_HEADER
#define LIGHT_HEADER

#include "common_irrlicht.h"
#include "debug.h"

/*
	Day/night cache:
	Meshes are cached for different day-to-night transition values
*/

/*#define DAYNIGHT_CACHE_COUNT 3
// First one is day, last one is night.
extern u32 daynight_cache_ratios[DAYNIGHT_CACHE_COUNT];*/

/*
	Lower level lighting stuff
*/

// This directly sets the range of light.
// Actually this is not the real maximum, and this is not the
// brightest. The brightest is LIGHT_SUN.
#define LIGHT_MAX 14
// Light is stored as 4 bits, thus 15 is the maximum.
// This brightness is reserved for sunlight
#define LIGHT_SUN 15

inline u8 diminish_light(u8 light)
{
	if(light == 0)
		return 0;
	if(light >= LIGHT_MAX)
		return LIGHT_MAX - 1;
		
	return light - 1;
}

inline u8 diminish_light(u8 light, u8 distance)
{
	if(distance >= light)
		return 0;
	return  light - distance;
}

inline u8 undiminish_light(u8 light)
{
	// We don't know if light should undiminish from this particular 0.
	// Thus, keep it at 0.
	if(light == 0)
		return 0;
	if(light == LIGHT_MAX)
		return light;
	
	return light + 1;
}

extern u8 light_decode_table[LIGHT_MAX+1];

inline u8 decode_light(u8 light)
{
	if(light == LIGHT_SUN)
		return light_decode_table[LIGHT_MAX];
	
	if(light > LIGHT_MAX)
		light = LIGHT_MAX;
	
	return light_decode_table[light];
}

#endif