Disable word wrap in vertical texts in main menu

[dragonfireclient.git] / src / light.h

diff --git a/src/light.h b/src/light.h
index b76ac3a5d7166371b08d6ff280993eed296c58a6..238acce43d2d73c52e0762f395e244c68a4ccb16 100644 (file)
--- a/src/light.h
+++ b/src/light.h
@@ -1,10 +1,46 @@
+/*
+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
+(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.
+
+You should have received a copy of the GNU 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 LIGHT_HEADER
 #define LIGHT_HEADER
 
 #include "common_irrlicht.h"
+#include "debug.h"
+
+/*
+       Day/night cache:
+       Meshes are cached for different day-to-night transition values
+*/
+
+/*#define DAYNIGHT_CACHE_COUNT 3
+// First one is day, last one is night.
+extern u32 daynight_cache_ratios[DAYNIGHT_CACHE_COUNT];*/
 
-// This directly sets the range of light
+/*
+       Lower level lighting stuff
+*/
+
+// This directly sets the range of light.
+// Actually this is not the real maximum, and this is not the
+// brightest. The brightest is LIGHT_SUN.
 #define LIGHT_MAX 14
+// Light is stored as 4 bits, thus 15 is the maximum.
 // This brightness is reserved for sunlight
 #define LIGHT_SUN 15
 
@@ -39,16 +75,27 @@ inline u8 undiminish_light(u8 light)
 
 extern u8 light_decode_table[LIGHT_MAX+1];
 
+// 0 <= light <= LIGHT_SUN
+// 0 <= return value <= 255
 inline u8 decode_light(u8 light)
 {
-       if(light == LIGHT_SUN)
-               return light_decode_table[LIGHT_MAX];
-       
        if(light > LIGHT_MAX)
-               throw;
+               light = LIGHT_MAX;
        
        return light_decode_table[light];
 }
 
+// 0 <= daylight_factor <= 1000
+// 0 <= lightday, lightnight <= LIGHT_SUN
+// 0 <= return value <= LIGHT_SUN
+inline u8 blend_light(u32 daylight_factor, u8 lightday, u8 lightnight)
+{
+       u32 c = 1000;
+       u32 l = ((daylight_factor * lightday + (c-daylight_factor) * lightnight))/c;
+       if(l > LIGHT_SUN)
+               l = LIGHT_SUN;
+       return l;
+}
+
 #endif