On Wed, 16 Feb 2005 16:53:36 +0100, Attila Kinali <[EMAIL PROTECTED]> wrote: > On Wed, 16 Feb 2005 13:40:10 +0100 > Nicolai Haehnle <[EMAIL PROTECTED]> wrote: > > > If I understand you correctly, the current software model can already do > > that. There are DMA uploads to transfer images from system memory to video > > memory (we need those anyway, for pixmaps and for textures), and we can > > just use the 3D rendering engine to do the final blit and scale. > > Yes, that's what i'm talking about. > > > Or maybe you're talking about video overlays, i.e. a setup where the video > > output part of the design basically reads from two framebuffers at the same > > time, with the second buffer (which optionally has independent size) being > > overlayed over the first? > > Hardly usefull. Although to overlay/blit units would be a cool feature :)
Well, it's not a big deal to design the video controller to put an 8-bit paletted overlay over 24-bit color. Using planemasks and other things, we can cause the video to be written directly into the viewable framebuffer only into the upper 8 bits. The drawback is that you can't have an alpha buffer in your viewable framebuffer. _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
