Re: [Mesa3d-dev] Bitmap and Pixmap Positioning

[Brian P. <br...@va...>]

Allen Barnett wrote:
> 
> Brian Paul wrote:
> >
> > Allen Barnett wrote:
> > > Maybe Mesa
> > > could be configured w/o Glide by default now that DRI is the way to go?
> >
> > Try ./configure --without-glide
> 
> (OK. I just meant to make --without-glide the default.)

That'll probably be the default in the future.  I don't know if many
people are still using the Glide driver.


> Also, about raster images: I see that you added a glWindowPosMESA
> extension which doesn't suffer from the viewport clipping effect of
> glRasterPos. However, the units of glWindowPos are the direct window
> coordinates. I think I need something somewhere in between, i.e., to
> draw an image at coordinates which are transformed by the
> projection/modelview matrices but whose origin may be outside the
> viewport. I know about the glBitmap(0,0,0,0,xmove,ymove,NULL) trick, but
> the xmove/ymove coordinates are in pixels, not model units. The
> following seems to work OK:
> 
> glGet viewing matrices
> gluProject( mx, my, mz, viewing matrices, &wx, &wy, &wz);
> glWindowPosMESA( wx, wy );
> glDrawPixels(...);
> 
> but this seems inefficient (as well as requiring a MESA extension). Is
> there some better trick I'm missing?

Take a look at this:
http://oss.sgi.com/projects/ogl-sample/registry/IBM/rasterpos_clip.txt

I could pretty easily implement this extension if you want it.

-Brian