Switch the license to be LGPLv2/later, with small parts still remaining as GPLv2...

[minetest.git] / src / light.cpp

diff --git a/src/light.cpp b/src/light.cpp
index 1e4dfcdf12051f813d6e3354e6db7debd2b98287..66bceb72bcbf15ead6cdf07356d89b868e4d13e4 100644 (file)
--- a/src/light.cpp
+++ b/src/light.cpp
@@ -3,23 +3,100 @@ 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
+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.
 */
 
 #include "light.h"
 
+#if 1
+// Middle-raised variation of a_n+1 = a_n * 0.786
+// Length of LIGHT_MAX+1 means LIGHT_MAX is the last value.
+// LIGHT_SUN is read as LIGHT_MAX from here.
+u8 light_decode_table[LIGHT_MAX+1] = 
+{
+8,
+11+2,
+14+7,
+18+10,
+22+15,
+29+20,
+37+20,
+47+15,
+60+10,
+76+7,
+97+5,
+123+2,
+157,
+200,
+255,
+};
+#endif
+
+#if 0
+/*
+Made using this and:
+- adding 220 as the second last one
+- replacing the third last one (212) with 195
 
+#!/usr/bin/python
+
+from math import *
+from sys import stdout
+
+# We want 0 at light=0 and 255 at light=LIGHT_MAX
+LIGHT_MAX = 14
+#FACTOR = 0.69
+#FACTOR = 0.75
+FACTOR = 0.83
+START_FROM_ZERO = False
+
+L = []
+if START_FROM_ZERO:
+    for i in range(1,LIGHT_MAX+1):
+        L.append(int(round(255.0 * FACTOR ** (i-1))))
+    L.append(0)
+else:
+    for i in range(1,LIGHT_MAX+1):
+        L.append(int(round(255.0 * FACTOR ** (i-1))))
+    L.append(255)
+
+L.reverse()
+for i in L:
+    stdout.write(str(i)+",\n")
+*/
+u8 light_decode_table[LIGHT_MAX+1] = 
+{
+23,
+27,
+33,
+40,
+48,
+57,
+69,
+83,
+100,
+121,
+146,
+176,
+195,
+220,
+255,
+};
+#endif
+
+#if 0
+// This is good
 // a_n+1 = a_n * 0.786
 // Length of LIGHT_MAX+1 means LIGHT_MAX is the last value.
 // LIGHT_SUN is read as LIGHT_MAX from here.
@@ -41,6 +118,50 @@ u8 light_decode_table[LIGHT_MAX+1] =
 200,
 255,
 };
+#endif
+
+#if 0
+// Use for debugging in dark
+u8 light_decode_table[LIGHT_MAX+1] = 
+{
+58,
+64,
+72,
+80,
+88,
+98,
+109,
+121,
+135,
+150,
+167,
+185,
+206,
+229,
+255,
+};
+#endif
+
+// This is reasonable with classic lighting with a light source
+/*u8 light_decode_table[LIGHT_MAX+1] = 
+{
+2,
+3,
+4,
+6,
+9,
+13,
+18,
+25,
+32,
+35,
+45,
+57,
+69,
+79,
+255
+};*/
+
 
 // As in minecraft, a_n+1 = a_n * 0.8
 // NOTE: This doesn't really work that well because this defines