HelperInvocation
HelperInvocation
Decorating a variable with the HelperInvocation built-in decoration
will make that variable contain whether the current invocation is a helper
invocation.
This variable is non-zero if the current fragment being shaded is a helper
invocation and zero otherwise.
A helper invocation is an invocation of the shader that is produced to
satisfy internal requirements such as the generation of derivatives.
It is very likely that a helper invocation will have a value of
SampleMask fragment shader input value that is zero.
Valid Usage
VUID-HelperInvocation-HelperInvocation-04239
The HelperInvocation decoration must be used only within the
Fragment Execution Model
VUID-HelperInvocation-HelperInvocation-04240
The variable decorated with HelperInvocation must be declared
using the Input Storage Class
VUID-HelperInvocation-HelperInvocation-04241
The variable decorated with HelperInvocation must be declared as a
boolean value