Assembler source is always generated by the compiler. You can prevent it from being deleted with the -r switch. At the console the compiler is invoked like this:
fbc -r -dylib SoundscapeGLSLf.bas
To get a listing of all the compiler options:
fbc
It's quite interesting to view the asm file. For things like Opengl, and general SDK coding, the assembler looks really simple. The Basic itself does not introduce any baggage so there is little to be gained by writing one's own assembler for these sections of code.
