drawimage+OpenGL draw poly

Is it possible to use the drawimage command to draw a sprite to the screen buffer and then
use OpenGL commands to draw triangles on top of this image on the same screen buffer?

I`m looking to draw shadows on top of a 2d picture and
I`d like to use the drawimage command to draw the
picture and openGL to draw the shadows.

Thanks,

I would believe so. I've mixed the native Blitzmax draw commands with OpenGL several times. I think the only catch was I had to set the graphics driver to GLMax2DDriver(). That allowed me to use the max drawImage/drawText/etc commands while still using openGL calls.