/*
-Minetest-c55
-Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
+Minetest
+Copyright (C) 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 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];*/
+#pragma once
+#include <cassert>
+#include "irrlichttypes.h"
/*
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.
+// Actually this is not the real maximum, and this is not the brightest, the
+// brightest is LIGHT_SUN.
+// If changed, this constant as defined in builtin/game/constants.lua must
+// also be changed.
#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
-inline u8 diminish_light(u8 light)
+#ifndef SERVER
+
+/**
+ * \internal
+ *
+ * \warning DO NOT USE this directly; it is here simply so that decode_light()
+ * can be inlined.
+ *
+ * Array size is #LIGHTMAX+1
+ *
+ * The array is a lookup table to convert the internal representation of light
+ * (brightness) to the display brightness.
+ *
+ */
+extern const u8 *light_decode_table;
+
+// 0 <= light <= LIGHT_SUN
+// 0 <= return value <= 255
+inline u8 decode_light(u8 light)
{
- if(light == 0)
- return 0;
- if(light >= LIGHT_MAX)
- return LIGHT_MAX - 1;
-
- return light - 1;
+ // assert(light <= LIGHT_SUN);
+ if (light > LIGHT_SUN)
+ light = LIGHT_SUN;
+ return light_decode_table[light];
}
-inline u8 diminish_light(u8 light, u8 distance)
-{
- if(distance >= light)
- return 0;
- return light - distance;
-}
+// 0.0 <= light <= 1.0
+// 0.0 <= return value <= 1.0
+float decode_light_f(float light_f);
-inline u8 undiminish_light(u8 light)
-{
- // We don't know if light should undiminish from this particular 0.
- // Thus, keep it at 0.
- if(light == 0)
- return 0;
- if(light == LIGHT_MAX)
- return light;
-
- return light + 1;
-}
+void set_light_table(float gamma);
-extern u8 light_decode_table[LIGHT_MAX+1];
+#endif // ifndef SERVER
-inline u8 decode_light(u8 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)
{
- if(light == LIGHT_SUN)
- return light_decode_table[LIGHT_MAX];
-
- if(light > LIGHT_MAX)
- light = LIGHT_MAX;
-
- return light_decode_table[light];
+ u32 c = 1000;
+ u32 l = ((daylight_factor * lightday + (c - daylight_factor) * lightnight)) / c;
+ if (l > LIGHT_SUN)
+ l = LIGHT_SUN;
+ return l;
}
-
-#endif
-