glPushDebugGroup, glPopDebugGroup, glObjectLabel, glGetObjectLabel.
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glGetObjectPtrLabel: man4/glGetObjectPtrLabel.xml
glGetObjectPtrLabel retrieves the label of the sync object identified by ptr. label is the address of a string that will be used to store the object label. bufSize specifies the number of characters in the array identified by label. length contains the address of a variable which will receive the the number of characters in the object label. If length is null, then it is ignored and no data is written. Likewise, if label is null, or if bufSize is zero then no data is written to label.