COpenGLPlayer

Here is a hopefully-small-enough-not-to-bother-anyone screenshot of an
SDK image Tweak-based OpenGL CPlayer running the code from the NeHe
OpenGL tutorial number 5 (or maybe now it's 6).  Not knowing what I'm
doing with OpenGL, it was a little bit difficult to get enough of the
initialization code presented in the earlier tutorials to work
properly with a lack of any platform-dependent code.  I finally got it
to work by using the OpenGL#initFrustum:bounds:zNear:zFar: method,
which I'm not sure is really kosher since it has a (software
emulated?) call to a glu... method.

Very nice, David!

I think that it's really handy to be able to futz around with OpenGL  
in Squeak without having to haul in all of Croquet.

Josh


On May 30, 2007, at 6:54 PM, David Faught wrote:

Cool. I'd like to play around with this if you don't mind sending me  
a changeset, or putting something into Contributions. Thanks David.

-Peter

On May 30, 2007, at 9:33 PM, Joshua Gargus wrote:

On May 31, 2007, at 3:54 , David Faught wrote:

> Here is a hopefully-small-enough-not-to-bother-anyone screenshot of an
> SDK image Tweak-based OpenGL CPlayer running the code from the NeHe
> OpenGL tutorial number 5 (or maybe now it's 6).

Cool!

>   Not knowing what I'm
> doing with OpenGL, it was a little bit difficult to get enough of the
> initialization code presented in the earlier tutorials to work
> properly with a lack of any platform-dependent code.

Interesting. So you did that on your own, not based on my old  
COpenGLPlayer?

http://permalink.gmane.org/gmane.comp.lang.smalltalk.tweak/198

> I finally got it
> to work by using the OpenGL#initFrustum:bounds:zNear:zFar: method,
> which I'm not sure is really kosher since it has a (software
> emulated?) call to a glu... method.
> <ScreenShot013.png>

Why shouldn't that be kosher? Nehe has a call to gluPerspective(),  
too ...

- Bert -

On 5/31/07, Bert Freudenberg <[hidden email]> wrote:
It IS based on your COpenGLPlayer (in fact, really this should have
been a subclass of that instead of just outright replacing the
rendering code), but I couldn't get it to work properly with the
viewport and frustum setup from that for some reason.

> > I finally got it
> > to work by using the OpenGL#initFrustum:bounds:zNear:zFar: method,
> > which I'm not sure is really kosher since it has a (software
> > emulated?) call to a glu... method.
> > <ScreenShot013.png>
>
> Why shouldn't that be kosher? Nehe has a call to gluPerspective(),
> too ...

But glu* calls are typically for a platform-specific library, aren't
they?  And I noticed that this method is the only glu* method
available and is actually coded in Squeak rather than being an
external library like one might expect.  So I guess it's okay, but
other glu* calls are not available.

On May 31, 2007, at 14:23 , David Faught wrote:

Nah, this was just a quick hack anyway. I'm glad someone is putting  
it to some sensible use.

> but I couldn't get it to work properly with the
> viewport and frustum setup from that for some reason.

I see ... well my setup code was just for 2D rendering IIRC.

GLU is the OpenGL Utility library and actually is cross-platform (it  
only uses GL functions). See

        http://www.opengl.org/documentation/specs/

It's just that it is not strictly necessary because all of its  
functions can be written in Smalltalk and we didn't want to bother  
with two libraries if one suffices ...

- Bert -

On 5/31/07, Bert Freudenberg <[hidden email]> wrote:
That along with your quick hack to get the global screen position
correct based on the differences in the mouse pointer position.  Your
quick hacks are very useful, thank you!

> > but I couldn't get it to work properly with the
> > viewport and frustum setup from that for some reason.
>
> I see ... well my setup code was just for 2D rendering IIRC.

Yes, in fact remembering what's in #initFrustum... (I don't have the
code in front of me) I think that what was missing was the
initialization of one of the two big matrices needed for 3D.

On 5/30/07, Joshua Gargus <[hidden email]> wrote:

> I think that it's really handy to be able to futz around with OpenGL
> in Squeak without having to haul in all of Croquet.

Yes, I'm planning on using this as the base for the procedural
texturing project that I keep threatening to do.

On 5/30/07, Peter Moore <[hidden email]> wrote:
> Cool. I'd like to play around with this if you don't mind sending me
> a changeset, or putting something into Contributions. Thanks David.

I'll make it available somewhere in the next few days.

On 5/31/07, Bert Freudenberg <[hidden email]> wrote:
> On May 31, 2007, at 14:23 , David Faught wrote:
...
It must be GLUT that I am thinking of.  Of course I really don't know
much about it either ...

Okay, now this code is available in the Hedgehog PublicContribs
repository in the Tweak-OpenGL package.  Let me know how it goes!