On his recently released “Blak and Blu” album, Gary Clark Jr. put in enough modern R&B, hip-hop flourishes, and frenetic rock ’n’ roll to avoid getting cornered as a conventional blues artist, even though the blues forms the guitarist and singer’s base. Live, Clark doesn’t need such overt gestures to make his point.

In a galvanizing two-hour concert Friday at Royale (where two planned shows at the Sinclair were moved as the Cambridge venue undergoes renovations), Clark dived headlong into blues not only with his own material but also with covers of songs associated with Jimi Hendrix and a couple of Kings (B.B. and Albert).