Re: [Dri-devel] half-life and gl_ztrick (glDepthRange)

[Miles P. <je...@tu...>]

If that does work, make sure to send a message to the list so it'll be in
the next CVS.. being able to play halflife would be nice :)

-miles

On Mon, 5 Mar 2001, Brian Paul wrote:

> Ove Kaaven wrote:
> > 
> > Oh, just noticed something else. The frame setup sequence is like:
> > 
> > glDepthFunc
> > glDepthRange
> > glMatrixMode
> > glLoadIdentity
> > glViewport
> > glFrustum
> > glCullFace
> > glMatrixMode
> > glLoadIdentity
> > glRotate
> > glTranslate
> > 
> > and I looked into the Mesa sources, where
> > 
> > _mesa_DepthRange
> > ...
> >    ctx->Viewport.WindowMap.m[MAT_SZ] = ctx->Visual->DepthMaxF * ((f - n) / 2.0);
> >    ctx->Viewport.WindowMap.m[MAT_TZ] = ctx->Visual->DepthMaxF * ((f - n) / 2.0 + n);
> > 
> > is overwritten by
> > 
> > gl_Viewport
> > ...
> >    ctx->Viewport.WindowMap.m[MAT_SZ] = 0.5 * ctx->Visual->DepthMaxF;
> >    ctx->Viewport.WindowMap.m[MAT_TZ] = 0.5 * ctx->Visual->DepthMaxF;
> > 
> > Maybe someone should determine what the correct code should be...
> 
> Try moving the _mesa_DepthRange() code into gl_Viewport() and test it.
> That could very well be the solution.
> 
> -Brian
> 
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