trust me I read through all the readme stuff...plus Lewpy has pretty cool explanation feature for the all the configurations...this is the explanation that he has for off-screen drawing......
.......
n the PSX, it is very easy to draw primitives to areas of VRAM that are not actually being displayed. These rendered images can then be re-used as textures that are actually displayed on the screen. This is emulated by using software routines to draw the primitives in the emulated PSX VRAM.
Disabled does not use any software routines. This is the fastest option, but will not display some styles of PSX rendering.
Basic uses software routines to render primitives that are determined not to be in the visible area of the PSX VRAM.
Extra takes the off-screen drawing a step further, with another level of checking. If an attempt is made to use a display buffer as a texture, then full off-screen drawing will be enabled, but only for the necessary amount of time. As soon as recursive texturing stops, the off-screen drawing falls back to Basic mode.
Extra+FBR is the same as Extra, but includes a framebuffer read at the start of full VRAM rendering, which is often necessary. This setting is designed for those that want swirly-screen effects, etc. but don't want framebuffer read access enabled all the time (note: designed with FFIX in mind!).
Full draws all primitives in to PSX VRAM using software routines at all times. It's like running a software plugin at the same time, so is obvious very processor-intensive, and can slow down emulation by a very large amount. But, it allows literally all PSX rendering techniques to be emulated.
--------------------------------------------
I've tried most of the other configurations and no luck...somebody has to use Lewpy's plugin....Lewpy you there..???