mirror of
https://github.com/minetest/minetest.git
synced 2024-12-02 04:23:45 +01:00
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/*
|
|
Minetest
|
|
Copyright (C) 2010-2013 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 Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 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 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, write to the Free Software Foundation, Inc.,
|
|
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#ifndef DAYNIGHTRATIO_HEADER
|
|
#define DAYNIGHTRATIO_HEADER
|
|
|
|
inline u32 time_to_daynight_ratio(float time_of_day, bool smooth)
|
|
{
|
|
float t = time_of_day;
|
|
if(t < 0)
|
|
t += ((int)(-t)/24000)*24000;
|
|
if(t >= 24000)
|
|
t -= ((int)(t)/24000)*24000;
|
|
if(t > 12000)
|
|
t = 24000 - t;
|
|
float values[][2] = {
|
|
{4250+125, 150},
|
|
{4500+125, 150},
|
|
{4750+125, 250},
|
|
{5000+125, 350},
|
|
{5250+125, 500},
|
|
{5500+125, 675},
|
|
{5750+125, 875},
|
|
{6000+125, 1000},
|
|
{6250+125, 1000},
|
|
};
|
|
if(!smooth){
|
|
float lastt = values[0][0];
|
|
for(u32 i=1; i<sizeof(values)/sizeof(*values); i++){
|
|
float t0 = values[i][0];
|
|
float switch_t = (t0 + lastt) / 2;
|
|
lastt = t0;
|
|
if(switch_t <= t)
|
|
continue;
|
|
return values[i][1];
|
|
}
|
|
return 1000;
|
|
} else {
|
|
for(u32 i=0; i<sizeof(values)/sizeof(*values); i++){
|
|
if(values[i][0] <= t)
|
|
continue;
|
|
if(i == 0)
|
|
return values[i][1];
|
|
float td0 = values[i][0] - values[i-1][0];
|
|
float f = (t - values[i-1][0]) / td0;
|
|
return f * values[i][1] + (1.0 - f) * values[i-1][1];
|
|
}
|
|
return 1000;
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|