Brian Paul wrote: > >>>Ian Romanick wrote: > >>>When I look at xc/extras/Mesa/src/mesa/main/config.h I see more items on > >>>my wishlist: Would it be possible to increase |MAX_WIDTH| and > >>>|MAX_HEIGHT| (and the matching texture limits of the software > >>>rasterizer) to 8192 to support larger displays (DMX, Xinerama and Xprint > >>>come in mind) ? > >> > >>If you increase MAX_WIDTH/HEIGHT too far, you'll start to see > >>interpolation errors in triangle rasterization (the software > >>routines). The full explanation is long, but basically there needs to > >>be enough fractional bits in the GLfixed datatype to accomodate > >>interpolation across the full viewport width/height. > > > > Will increasing MAX_WIDTH/HEIGHT affect applications which run in > > small windows or only those which use resolutions exceeding the 4Kx4K > > limit? > > Increasing MAX_WIDTH/HEIGHT will result in more memory usage > regardless of window size.
This is just memory which comes from the stack (excluding the |MALLOC()| xc/extras/Mesa/src/mesa/drivers/x11/xm_api.c) , right ? > As is, you can't exceed 4K x 4K resolution without increasing > MAX_WIDTH/HEIGHT. Your glViewport call will be clamped to those > limits if you specify larger. Which leads to some unfortunate problems for printing, think about a ISO-A4 page at 600DPI where a GL window covering the whole paper surface is beyond the current 4Kx4K limit (that's the reason why the print demo in "glxgears" simply shrinks width/height obtained from |XpGetPageDimensions()| (AFAIK to 1/2 or 1/3) and then centers the window on the page before starting to print). > >>In fact, I'm not sure that we've already gone too far by setting > >>MAX_WIDTH/HEIGHT to 4096 while the GLfixed type only has 11 fractional > >>bits. I haven't heard any reports of bad triangles so far though. > > > > Do you know any specific application which may expose bad rendering > > when the size gets to large? > > No (there's far too many OpenGL apps out there for me to say). > > >>But there probably aren't too many people generating 4Kx4K images. > > > > We've been running tests with the glutdemo applications and Xprint at > > higher resolutions (6Kx8K window size) and did not notice any bad > > rendering using the software rasterizer. > > How large are your triangles? See above... usually 8Kx8K is enought for DIN-A4/600DPI, for larger paper sizes you either go down with the surface resolution or you have to deal with larger coordinates (which leads directly to this MAX_WIDTH/MAX_HEIGHT debate) ... ---- Bye, Roland -- __ . . __ (o.\ \/ /.o) [EMAIL PROTECTED] \__\/\/__/ MPEG specialist, C&&JAVA&&Sun&&Unix programmer /O /==\ O\ TEL +49 641 7950090 (;O/ \/ \O;) ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
