kernel vec4 blur(sampler image, float radius)
{
vec2 basePos = destCoord();
int i, j;
vec4 sum = vec4(0.0);
float radSq = radius * radius;
vec2 delta;
for (i = -10; i <= 10; ++i)
{
delta.x = float(i);
for (j = -10; j <= 10; ++j)
{
delta.y = float(j);
sum += ((dot(delta, delta) < radSq)?
sample( image, basePos + delta ) :
vec4(0));
}
}
sum.rgb /= sum.a;
sum.a = 1.0;
return sum;
}
As is, this works, albeit more slowly than I would like. But what I
don't understand is that if I change those loop limits from 10s to
20s, it doesn't just take 4 times longer, weird stuff happens. Like
the whole screen flickers, and Quartz Composer hangs, and then the
whole machine hangs requiring a forced restart. What's up with that?
By the way, someone will doubtless notice that I am essentially doing a disk blur here, and point out that Apple ships a disk blur filter. What I ultimately want to do is more complicated, this is just a learning exercise along the way.
smime.p7s
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