Data is passed into and out of shaders using variables with input or output
storage class, respectively.
User-defined inputs and outputs are connected between stages by matching
their Location
decorations.
Additionally, data can be provided by or communicated to special functions
provided by the execution environment using BuiltIn
decorations.
In many cases, the same BuiltIn
decoration can be used in multiple
shader stages with similar meaning.
The specific behavior of variables decorated as BuiltIn
is documented
in the following sections.