Translated using Weblate (Chinese (Simplified))

[oweals/minetest.git] / src / daynightratio.h

diff --git a/src/daynightratio.h b/src/daynightratio.h
index 1b075c4faedfd0af4022a791f21e7e8ac16b19b5..538767cad94c33ee4d762269361e9ee3bfbb9738 100644 (file)
--- a/src/daynightratio.h
+++ b/src/daynightratio.h
@@ -1,43 +1,72 @@
 /*
-Minetest-c55
-Copyright (C) 2010-2012 celeron55, Perttu Ahola <celeron55@gmail.com>
+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 General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
+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 General Public License for more details.
+GNU Lesser General Public License for more details.
 
-You should have received a copy of the GNU General Public License along
+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
+#pragma once
 
-inline u32 time_to_daynight_ratio(u32 time_of_day)
+inline u32 time_to_daynight_ratio(float time_of_day, bool smooth)
 {
-       s32 t = time_of_day%24000;
-       if(t < 4500 || t >= 19500)
-               return 150;
-       else if(t < 4750 || t >= 19250)
-               return 250;
-       else if(t < 5000 || t >= 19000)
-               return 350;
-       else if(t < 5250 || t >= 18750)
-               return 500;
-       else if(t < 5500 || t >= 18500)
-               return 675;
-       else if(t < 5750 || t >= 18250)
-               return 875;
-       else
+       float t = time_of_day;
+       if (t < 0.0f)
+               t += ((int)(-t) / 24000) * 24000.0f;
+       if (t >= 24000.0f)
+               t -= ((int)(t) / 24000) * 24000.0f;
+       if (t > 12000.0f)
+               t = 24000.0f - t;
+
+       const float values[9][2] = {
+               {4250.0f + 125.0f, 175.0f},
+               {4500.0f + 125.0f, 175.0f},
+               {4750.0f + 125.0f, 250.0f},
+               {5000.0f + 125.0f, 350.0f},
+               {5250.0f + 125.0f, 500.0f},
+               {5500.0f + 125.0f, 675.0f},
+               {5750.0f + 125.0f, 875.0f},
+               {6000.0f + 125.0f, 1000.0f},
+               {6250.0f + 125.0f, 1000.0f},
+       };
+
+       if (!smooth) {
+               float lastt = values[0][0];
+               for (u32 i = 1; i < 9; i++) {
+                       float t0 = values[i][0];
+                       float switch_t = (t0 + lastt) / 2.0f;
+                       lastt = t0;
+                       if (switch_t <= t)
+                               continue;
+
+                       return values[i][1];
+               }
                return 1000;
-}
+       }
 
-#endif
+       if (t <= 4625.0f) // 4500 + 125
+               return values[0][1];
+       else if (t >= 6125.0f) // 6000 + 125
+               return 1000;
+
+       for (u32 i = 0; i < 9; i++) {
+               if (values[i][0] <= t)
+                       continue;
 
+               float td0 = values[i][0] - values[i - 1][0];
+               float f = (t - values[i - 1][0]) / td0;
+               return f * values[i][1] + (1.0f - f) * values[i - 1][1];
+       }
+       return 1000;
+}