Re: Error message running iupgl.wlua

[Frank Meier-Dörnberg <frank@...>]

Andrew Wilson schrieb:
> Hmm, Frank, that is odd, both iupgl.wlua & iupglcanvas.wlua work for
> me on Lua for Windows. Anyone else having problem with those
> examples???  Andrew
>
> On Thu, Sep 11, 2008 at 3:51 PM, Frank Meier-Dörnberg <frank@md-web.de> wrote:
>   
> > Dear IUP, LuaGL or Lua for Windows maintainers
> >
> > 1st, let me say: Many thanks for all the great stuff you made.
> >
> > 2nd, unfortunately the Iupcanvas.wlua example does not work right "out of
> > the box" as packaged with Lua For Windows.
> > The error message
> > "...a\5.1\examples\iup\ctrl\iupglcanvas\iupglcanvas.wlua:12: attempt to call
> > global 'glClearColor' (a nil value)" occours.
> >
> > It is easy to fix:
> > Line 7 have to be:  gl = require( "luagl" )
> >
> > Frank
> >
> > P.S.
> > same applies to iupgl.wlua
> >
> >
> >
> >
> >     
>
>   
Oh! Ok, something weird.

The original code of luagl.wlua beginns with:

<codefragment>
require( "iuplua" )
require( "iupluagl" )
require( "luagl" )

canvas = iup.glcanvas{buffer="DOUBLE", rastersize = "640x480"}

function canvas:resize_cb(width, height)
 iup.GLMakeCurrent(self)

 gl.Viewport(0, 0, width, height)               -- <-- where "gl" does 
come from?
...
</codefragment>>

The message is
".\luagl.lua:10: attempt to index global 'gl' (a nil value)"

So, let me ask:
Where is "gl" defined?


Frank