Re: [cadcdev-tiki] GL_QUADS

[Dan P. <ba...@al...>]

On May 11, 2006, at 7:39 PM, Sam Steele wrote:

> Hmm, odd.  I don't run into a problem when rendering the screen  
> with GL_QUADS in KGL, only when using plx-compat.  It draws the  
> entire background array on the opaque list, then draws almost half  
> of the foreground on the translucent list (on the last character it  
> tries to render, it only draws 1 of the two triangles).  I'm not  
> seeing any messages on the dc-load console, so I have no idea  
> what's up.  Any ideas?

DR would be one explanation actually -- KGL appears to transform all  
the verts at once (with one mat_transform call) and send them to the  
TA using DR, while the plx_compat stuff would send them as triangle  
strips, probably not with the same efficiency. So it could actually  
be a memory bandwidth issue rather than a rendering time issue. You'd  
be sending the same verts but less efficiently.

Aside from that though, I think we shouldn't be using plxcompat on  
the DC. We might ought to figure out a way to use the real plx stuff  
because it's quite a bit faster, especially with DR. Not 100% sure  
how that would work (especially as how you don't need a DR context  
under other OSes even if you use the plx_compat functions with DR  
^_^;) but it'd be nice. Then if something needs to run nicely on a DC  
you can just write your stuff with plx calls and be good on all  
platforms (FoF was done this way, e.g.).