[Openmcl-devel] Foreign Function Questions

Brent Fulgham bfulg at pacbell.net
Fri Nov 24 20:48:08 PST 2006

I have a couple of questions regarding the FFI and interface  
databases.  Perhaps this is covered in the documentation, but an  
initial review did not turn up what I was looking for.

1.  Is there a way to get the correct "decorated" names of the FFI  
functions from the database?  While it's pretty easy (in many cases)  
to guess from the original C header, I can't always figure out how  
things like arrays and other pointer types are expected to be passed.

2.  I would like to define some materials for the OpenGL FFI  
interface.  In C, this might look something like:

      glMaterialfv(GL_BACK, GL_DIFFUSE, {0.396, 0.74151, 0.69102, 1.0});

      But if I attempt to call it using something like:

       (#_glMaterialfv #$GL_FRONT #$_GL_AMBIENT #(0.396D0 0.74151D0  
0.69102D0 1.0D0))

I get an error:  "> Error: value #<SIMPLE-VECTOR 4> is not of the  
expected type MACPTR."

What's the proper way to declare this in the FFI description?



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