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float dx = bx - lx;
float dy = by - ly;
float dist = (float)sqrt(dx * dx + dy * dy);
if (dist < 1.0f)
return;
int reach = light.attr1;
int steps = (int)(reach * reach * 1.6f /
dist); // can change this for speedup/quality?
const int PRECBITS = 12;
const float PRECF = 4096.0f;
int x = (int)(lx * PRECF);
int y = (int)(ly * PRECF);
int l = light.attr2 << PRECBITS;
int stepx = (int)(dx / (float)steps * PRECF);
int stepy = (int)(dy / (float)steps * PRECF);
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float dx = bx - lx;
float dy = by - ly;
float dist = (float)sqrt(dx * dx + dy * dy);
if (dist < 1.0f)
return;
int reach = light.attr1;
int steps = (int)(reach * reach * 1.6f /
dist); // can change this for speedup/quality?
const int PRECBITS = 12;
const float PRECF = 4096.0f;
int x = (int)(lx * PRECF);
int y = (int)(ly * PRECF);
int l = light.attr2 << PRECBITS;
int stepx = (int)(dx / (float)steps * PRECF);
int stepy = (int)(dy / (float)steps * PRECF);
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y += stepy;
l -= stepl;
g -= stepg;
b -= stepb;
stepl -= 25;
stepg -= 25;
stepb -= 25;
};
};
};
};
};
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y += stepy;
l -= stepl;
g -= stepg;
b -= stepb;
stepl -= 25;
stepg -= 25;
stepb -= 25;
}
} else // white light, special optimized version
{
int dimness = rnd((255 - light.attr2) / 16 + 1);
x += stepx * dimness;
y += stepy * dimness;
if (OUTBORD(x >> PRECBITS, y >> PRECBITS))
return;
loopi(steps)
{
sqr *s = S(x >> PRECBITS, y >> PRECBITS);
int tl = (l >> PRECBITS) + s->r;
s->r = s->g = s->b = tl > 255 ? 255 : tl;
if (SOLID(s))
return;
x += stepx;
y += stepy;
l -= stepl;
stepl -= 25;
}
};
} else // the old (white) light code, here for the few people with old
// video cards that don't support overbright
{
loopi(steps)
{
sqr *s = S(x >> PRECBITS, y >> PRECBITS);
int light = l >> PRECBITS;
if (light > s->r)
s->r = s->g = s->b = (uchar)light;
if (SOLID(s))
return;
x += stepx;
y += stepy;
l -= stepl;
}
};
}
void
calclightsource(persistent_entity &l)
{
int reach = l.attr1;
int sx = l.x - reach;
int ex = l.x + reach;
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};
for (float sy2 = sy + s; sy2 <= ey - s; sy2 += s * 2) {
lightray((float)sx, sy2, l);
lightray((float)ex, sy2, l);
};
rndtime();
};
#define median(m) \
s->m = \
(s->m * 2 + SW(s, 1, 0)->m * 2 + SW(s, 0, 1)->m * 2 + \
SW(s, -1, 0)->m * 2 + SW(s, 0, -1)->m * 2 + SW(s, 1, 1)->m + \
SW(s, 1, -1)->m + SW(s, -1, 1)->m + SW(s, -1, -1)->m) / \
14; // median is 4/2/1 instead
median(r);
median(g);
median(b);
};
};
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};
for (float sy2 = sy + s; sy2 <= ey - s; sy2 += s * 2) {
lightray((float)sx, sy2, l);
lightray((float)ex, sy2, l);
};
rndtime();
}
void
postlightarea(block &a) // median filter, smooths out random noise in light and
// makes it more mipable
{
loop(x, a.xs) loop(y, a.ys) // assumes area not on edge of world
{
sqr *s = S(x + a.x, y + a.y);
#define median(m) \
s->m = \
(s->m * 2 + SW(s, 1, 0)->m * 2 + SW(s, 0, 1)->m * 2 + \
SW(s, -1, 0)->m * 2 + SW(s, 0, -1)->m * 2 + SW(s, 1, 1)->m + \
SW(s, 1, -1)->m + SW(s, -1, 1)->m + SW(s, -1, -1)->m) / \
14; // median is 4/2/1 instead
median(r);
median(g);
median(b);
}
remip(a);
}
void
calclight()
{
loop(x, ssize) loop(y, ssize)
{
sqr *s = S(x, y);
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