Re: FLI type error

> Both of these get a runtime error
> "aPos"  (and "triangleColor") cannot be converted to foreign type
> (:POINTER   OPENGL:GLCHAR).
> 

Offhand… did the OpenGL API change since 10 years ago? Perhaps now expects an array of char, or a string pointer?



> On Mar 7, 2026, at 09:59, Paul Werkowski (as pw at snoopy dot qozzy dot com) <[email protected]> wrote:
> 
> I'm looking at some code from 5-10 years ago, experimenting with OPENGL, that uses the LW example code to setup the interface. The icosahedron example works fine so no issue there.
> 
> Here are two fragments from my code.
> 
>  (let ((pos-attr (gl-get-attrib-location shader-pgm "aPos"))
> 
>  (let((unicolor (gl-get-uniform-location
>                             shader-pgm "triangleColor")))
> 
> Both of these get a runtime error
> "aPos"  (and "triangleColor") cannot be converted to foreign type
> (:POINTER   OPENGL:GLCHAR).
> 
> GLCHAR is defined in opengl/types.lisp as
> 
> (fli:define-c-typedef (glchar (:foreign-name "GLchar"))
>   :char)
> 
> Same issue with both LWW 8.1.2 64 bit and 7.1.2 32 bit.
> 
> This all used to work. What could be wrong???
> 
> Puzzled again,
> Paul
> 
> 
> 
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