Function drmtap_render_node 

pub unsafe extern "C" fn drmtap_render_node(
    ctx: *mut drmtap_ctx,
) -> *const c_char

Render node of the device backing ctx, for handing to drmtap_open_render on the converting side of a split so it binds to the GPU that exported the frame. Owned by ctx; NULL if it has none.