-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Roland Scheidegger wrote: > So, when trying to implement ARB_point_parameters and ARB_point_sprite, > I came across some problem (this tnl stuff is hard to follow). The > problem is, I need to set some hardware state dependant on the primitive > being renderered (in particular, r200 needs perspective correction > disabled for point sprites, as otherwise the tex coord interpolator will > wreak havoc with the (hw-generated) point sprite texture coordinates). > Obviously, this should only be disabled when actually rendering points. > However, if there are no state changes between a glEnd and glBegin > command, no usual state validation will happen. > Am I missing something, or is it more or less impossible to emit state > depending on the primitive?
I thought there was a mechanism that allowed the driver to be notified at glBegin (or similar) time. It seems like you ought to be able to emit some extra state at that time to change to / from point-sprite mode. > Same problem also exists for sw tcl - additionally there we'd want to > change the vertex format (for point parameters attenuation), as it's > highly inefficient to submit per-vertex point size if we aren't drawing > points... You might be able to do this in the begin-notify routine also. Alternately, you could add an extra pipeline stage that does the required tweaking. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (GNU/Linux) iD8DBQFFFC2vX1gOwKyEAw8RAuyxAJ937gF4uksm7dDcJaTmhXh2b3ZtCQCgkO5P Kz/wpcTwV3CLT+zRj1pgImw= =KlCv -----END PGP SIGNATURE----- ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
