title: Is it possible to make a shader extend another shader in Unity
body: <p>I want to make a couple of GPU textures using perlin noise and whatnot, so I have this big shader that have all those perlin, simplex, voronoi noises functions and then just make a new shader that extends the big one having just one function with stuff like: </p>
  
  <p>color = perlin(x, y, z) + perlin(x*10, y*10, z*10) / voronoi(x,y,z);</p>
  
  <p>Is it possible? What is the best approach? I will end up making one shader per texture, so it will be a lot of shaders and I would prefer to avoid having to copy/paste all of these functions, especially if I ever need to remake one of them</p>