Use GPZBM to insert a Set Z-Buffer Protect Mask structure element into the open structure following the element pointer or to replace the element pointed at by the element pointer with a Set Z-Buffer Protect Mask structure element depending on the current edit mode.
During structure traversal, this structure elements sets the Z-Buffer Protect Mask entry of the graPHIGS API traversal state to the value specified by the parameter.
The mask value specifies a write-protect mask for the z-buffer to inhibit writing into the z-buffer during the rendering of output primitives. If a z-buffer is not present on the workstation, then this attribute is ignored.
The mask is a 32-bit integer. The mask supports two values:
The traversal default for the z-buffer protect mask is a value of 0 for all 32 bits.
GPZBM is identified as GSE 1009.
Not all GSEs are supported on all workstations. Use the Inquire List of Generalized Structure Elements (GPQGSE) subroutine to determine the GSEs which are supported by an open workstation. See also the workstation descriptors in The graPHIGS Programming Interface: Technical Reference