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Smooth day-night transitions

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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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56
src/daynightratio.h
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@ -20,23 +20,49 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#ifndef DAYNIGHTRATIO_HEADER
#define DAYNIGHTRATIO_HEADER
inline u32 time_to_daynight_ratio(u32 time_of_day)
inline u32 time_to_daynight_ratio(float time_of_day, bool smooth)
{
s32 t = time_of_day%24000;
if(t < 4500 || t >= 19500)
return 150;
else if(t < 4750 || t >= 19250)
return 250;
else if(t < 5000 || t >= 19000)
return 350;
else if(t < 5250 || t >= 18750)
return 500;
else if(t < 5500 || t >= 18500)
return 675;
else if(t < 5750 || t >= 18250)
return 875;
else
float t = time_of_day;
if(t < 0)
t += ((int)(-t)/24000)*24000;
if(t >= 24000)
t -= ((int)(t)/24000)*24000;
if(t > 12000)
t = 24000 - t;
float values[][2] = {
{4250+125, 150},
{4500+125, 150},
{4750+125, 250},
{5000+125, 350},
{5250+125, 500},
{5500+125, 675},
{5750+125, 875},
{6000+125, 1000},
{6250+125, 1000},
};
if(!smooth){
float lastt = values[0][0];
for(u32 i=1; i<sizeof(values)/sizeof(*values); i++){
float t0 = values[i][0];
float switch_t = (t0 + lastt) / 2;
lastt = t0;
if(switch_t <= t)
continue;
return values[i][1];
}
return 1000;
} else {
for(u32 i=0; i<sizeof(values)/sizeof(*values); i++){
if(values[i][0] <= t)
continue;
if(i == 0)
return values[i][1];
float td0 = values[i][0] - values[i-1][0];
float f = (t - values[i-1][0]) / td0;
return f * values[i][1] + (1.0 - f) * values[i-1][1];
}
return 1000;
}
}
#endif