Flickering Light Interpolation

[RaVeN RaVeN]

In gl_rlight.c find function
void R_AnimateLight (void)

And change content to:
{
int         j, k;
float      l;
int         flight;
int         clight;
float      lerpfrac;
float      backlerp;
extern cvar_t r_interpolate_light;

// light animations //mh //mhquake
// 'm' is normal light, 'a' is no light, 'z' is double bright
flight = (int) floor (cl.time * 10);
clight = (int) ceil (cl.time * 10);
lerpfrac = (cl.time * 10) - flight;
backlerp = 1.0f - lerpfrac;

for (j = 0; j < MAX_LIGHTSTYLES; j++)
{
if (!cl_lightstyle.length)
{
// was 256, changed to 264 for consistency
d_lightstylevalue = 264;
continue;
}
else if (cl_lightstyle.length == 1)
{
// single length style so don't bother interpolating
d_lightstylevalue = 22 * (cl_lightstyle.map - 'a');
continue;
}

if (1/*r_interpolate_light.value*/)
{
// interpolate animating light
// frame just gone
k = flight % cl_lightstyle.length;
k = cl_lightstyle.map - 'a';
l = (float) (k * 22) * backlerp;

// upcoming frame
k = clight % cl_lightstyle.length;
k = cl_lightstyle.map - 'a';
l += (float) (k * 22) * lerpfrac;

d_lightstylevalue = (int) l;
}
else
{
k = flight % cl_lightstyle.length;
k = cl_lightstyle.map - 'a';
k = k * 22;
d_lightstylevalue = k;
}
}  
}