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Smooth day-night transitions

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This commit is contained in:
Perttu Ahola 2012-12-02 18:02:04 +02:00
parent 041585a78e
commit 804a7875a2
7 changed files with 87 additions and 23 deletions
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28
src/light.h
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@ -85,6 +85,24 @@ inline u8 decode_light(u8 light)
return light_decode_table[light];
}
// 0.0 <= light <= 1.0
// 0.0 <= return value <= 1.0
inline float decode_light_f(float light_f)
{
s32 i = (u32)(light_f * LIGHT_MAX + 0.5);
if(i <= 0)
return (float)light_decode_table[0] / 255.0;
if(i >= LIGHT_MAX)
return (float)light_decode_table[LIGHT_MAX] / 255.0;
float v1 = (float)light_decode_table[i-1] / 255.0;
float v2 = (float)light_decode_table[i] / 255.0;
float f0 = (float)i - 0.5;
float f = light_f * LIGHT_MAX - f0;
return f * v2 + (1.0 - f) * v1;
}
// 0 <= daylight_factor <= 1000
// 0 <= lightday, lightnight <= LIGHT_SUN
// 0 <= return value <= LIGHT_SUN
@ -97,5 +115,15 @@ inline u8 blend_light(u32 daylight_factor, u8 lightday, u8 lightnight)
return l;
}
// 0.0 <= daylight_factor <= 1.0
// 0 <= lightday, lightnight <= LIGHT_SUN
// 0 <= return value <= 255
inline u8 blend_light_f1(float daylight_factor, u8 lightday, u8 lightnight)
{
u8 l = ((daylight_factor * decode_light(lightday) +
(1.0-daylight_factor) * decode_light(lightnight)));
return l;
}
#endif