code: func DrawElementsInstancedBaseVertex(mode uint32, count int32, xtype uint32, indices unsafe.Pointer, instancecount int32, basevertex int32) {
  	syscall.Syscall6(gpDrawElementsInstancedBaseVertex, 6, uintptr(mode), uintptr(count), uintptr(xtype), uintptr(indices), uintptr(instancecount), uintptr(basevertex))
  }
docs: // render multiple instances of a set of primitives from array data with a per-element offset