70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/*
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Minetest
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Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef DAYNIGHTRATIO_HEADER
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#define DAYNIGHTRATIO_HEADER
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inline u32 time_to_daynight_ratio(float time_of_day, bool smooth)
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{
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float t = time_of_day;
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if(t < 0)
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t += ((int)(-t)/24000)*24000;
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if(t >= 24000)
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t -= ((int)(t)/24000)*24000;
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if(t > 12000)
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t = 24000 - t;
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float values[][2] = {
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{4250+125, 150},
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{4500+125, 150},
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{4750+125, 250},
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{5000+125, 350},
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{5250+125, 500},
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{5500+125, 675},
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{5750+125, 875},
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{6000+125, 1000},
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{6250+125, 1000},
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};
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if(!smooth){
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float lastt = values[0][0];
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for(u32 i=1; i<sizeof(values)/sizeof(*values); i++){
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float t0 = values[i][0];
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float switch_t = (t0 + lastt) / 2;
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lastt = t0;
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if(switch_t <= t)
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continue;
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return values[i][1];
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}
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return 1000;
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} else {
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for(u32 i=0; i<sizeof(values)/sizeof(*values); i++){
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if(values[i][0] <= t)
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continue;
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if(i == 0)
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return values[i][1];
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float td0 = values[i][0] - values[i-1][0];
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float f = (t - values[i-1][0]) / td0;
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return f * values[i][1] + (1.0 - f) * values[i-1][1];
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}
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return 1000;
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}
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}
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#endif
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