Sample projection and depth extraction.
Sample projection and depth extraction.

We project the view-space position of the sample into NDC space. This
gives us UV coordinates, from which we can read and linearize the scene
depth at the same point.


Former-commit-id: 4c798ca56085d52f1bf7af55f8a620f8c0e557a9
kosua20/GL_Template,kosua20/GL_Template