[cl-opengl-devel] problem with vertex arrays

[Sebastian Berchtold]

Hello,
im not an experienced lisper and especially new to c-bindings.

I try to handle vertex arrays in cl-opengl and have some problems with the type-specifiers.
I try to explain it on the redbook example varray.lisp:

When compiling it it get the following error:
-+  Errors (1)
 `-- SB-INT:SIMPLE-READER-PACKAGE-ERROR at 1100 (line 33, column 22) on #<SB-SYS:FD-STREAM for "file /home/jonnyb/zeug/progs/cl-opengl/examples/redbook/varray.lisp" {B797599}>:
       Symbol "VERTEX-POINTER" not found in the CL-OPENGL package.

When i change the package name "gl:" to "%gl:" in the line:
    (gl:vertex-pointer 2 :int 0 vertices)
and also in the lines:
    (gl:color-pointer 3 :float 0 colors)))
    (gl:interleaved-arrays :c3f-v3f 0 intertwined)
i can avoid these errors.


But then the debugger pops up with the following:
   The value (25 25 100 325 175 25 175 325 250 25 ...)
   is not of type
     SB-SYS:SYSTEM-AREA-POINTER.
      [Condition of type TYPE-ERROR]

This leads me to the following questions:
Whats the difference between the "%gl:" und the "gl" package?   it spent some time on it but didnt get it
Does anybody know how to fix that?^^
Does this example run on somebody elses machine?

Im running it in sbcl on linux.
Thank you for your help! 





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