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.
*/
#ifndef LIGHT_HEADER
#define LIGHT_HEADER
-#include "common_irrlicht.h"
+#include "irrlichttypes.h"
#include "debug.h"
/*
Lower level lighting stuff
*/
-// This directly sets the range of light
+// 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
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)
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