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73 lines
1.9 KiB
C
73 lines
1.9 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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#pragma once
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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 < 0.0f)
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t += ((int)(-t) / 24000) * 24000.0f;
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if (t >= 24000.0f)
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t -= ((int)(t) / 24000) * 24000.0f;
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if (t > 12000.0f)
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t = 24000.0f - t;
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const float values[9][2] = {
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{4250.0f + 125.0f, 175.0f},
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{4500.0f + 125.0f, 175.0f},
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{4750.0f + 125.0f, 250.0f},
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{5000.0f + 125.0f, 350.0f},
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{5250.0f + 125.0f, 500.0f},
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{5500.0f + 125.0f, 675.0f},
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{5750.0f + 125.0f, 875.0f},
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{6000.0f + 125.0f, 1000.0f},
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{6250.0f + 125.0f, 1000.0f},
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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 < 9; i++) {
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float t0 = values[i][0];
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float switch_t = (t0 + lastt) / 2.0f;
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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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}
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if (t <= 4625.0f) // 4500 + 125
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return values[0][1];
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else if (t >= 6125.0f) // 6000 + 125
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return 1000;
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for (u32 i = 0; i < 9; i++) {
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if (values[i][0] <= t)
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continue;
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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] + (1.0f - f) * values[i - 1][1];
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}
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return 1000;
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}
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