GDAL is your friend!

I'm curious why you'd need to rasterize the lat/lon points and then present the image to OpenGL rather than just projecting the points and letting OpenGL do the grunt work of rasterization? The general technique is to project from lat/lon/alt to your final east/north/up coordinate system using GDAL and the present those points to OpenGL. My development system's acting up and needs to be redone or I'd have an example for you.