DX sadly doesnt support
immediate mode rendering,
immediate mode rendering,
Since When? BMAX DX is Immediate mode.
From the DX7 SDK Docs :
Direct3D has two modes: Immediate Mode and Retained Mode. Retained Mode is a high-level 3-D API for programmers who require rapid development or who want the help of the Retained Mode built-in support for hierarchies and animation.
Direct3D Immediate Mode is a low-level 3-D API that is ideal for developers who need to port games and other high-performance multimedia applications to the Windows operating system. Immediate Mode is a device-independent way for applications to communicate with accelerator hardware at a low level. Direct3D Retained Mode is built on top of Immediate Mode.