On Tue, 2009-08-18 at 05:25 -0700, Cooper Yuan wrote: > Hi, > > Does bypass_vs_clip_and_viewport influence vertex fetch? > I thought vertex transform engine is behind vertex shader, that means, > bypass_vs_clip_and_viewport will not impact vertex fetch. > > But when I debug glClear issue on r500 gallium driver, if driver > disable VTE, the color data can't be fetched (position is correct), > enabled VTE can fetch color data successfully. > > Could anyone give me clues?
All this flag means is that the state tracker is sending you pre-transfomed (ie window-space) vertex positions. If it sends you vertex x,y == 100,300 then one corner of your triangle is at that pixel coordinate. It's basically the same case as if you've used the draw module to do software transformation within the driver. That said, I think we remove the remaining usage of this functionality from the Mesa state tracker - it's a serious corner case for the open-source drivers. Keith ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Mesa3d-dev mailing list Mesa3d-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
