best way to change RGB but preserve alpha

Sometimes I write long code bender only to discover that it should really be oneliner. I feel that this situation is no exception,

i.e.

float = p4.a;

P4 = sample (...);

P4.a = a;

is there better way?

Swizzling allows you to turn this into a single line. Use this:

P4. RGB = sample (...). RGB;

Tags: Pixel Bender

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