SPIR-V Built-In
PrimitiveCountNV
Number of primitives output by a mesh shader
PrimitiveCountNV
Decorating a variable with the PrimitiveCountNV decoration will make
that variable contain the primitive count.
The primitive count specifies the number of primitives in the output mesh
produced by the mesh shader that will be processed by subsequent pipeline
stages.
Valid Usage
VUID-PrimitiveCountNV-PrimitiveCountNV-04327
The PrimitiveCountNV decoration must be used only within the
MeshNV Execution Model
VUID-PrimitiveCountNV-PrimitiveCountNV-04328
The variable decorated with PrimitiveCountNV must be declared
using the Output Storage Class
VUID-PrimitiveCountNV-PrimitiveCountNV-04329
The variable decorated with PrimitiveCountNV must be declared as a
scalar 32-bit integer value