Vadim Plessky wrote: >On Saturday 20 October 2001 08:08, Carsten Haitzler (The Rasterman) wrote: >| >| you can't always do both. and you want 8bits for alpha.. not 24 :). >| xrender is alreayd done.. also u dont always want 8bits per color. there is >| a lot of hardware that will only do 4 bits per channel. > >Hmmm. Where have you seen such hardware? >Generally speaking, there are only two (major) manufacturers of graphics >chips left - ATI and NVIDIA. >Even entry-level chips/cards from those companies support 24-bit (and 32-bit) >color. >If you take Matrox - they cards also support 24-bit. >So, I see no point to code for something less than 24-bit. > We talk about alpha channels :-)
>Probbaly, we should look at Radeon and GeForce2/3 chips and see what do they >support. What kind of alpha-channel they can do? > But yes, GeForces support 24bits alphas. In any case we also should to think about software translucenting. It seems to me that in Windows2000/XP alpha channels for windows is realised via double buffer (according to perfomarnce hit with low videoram <2MB). It draw all withou alpha blended windows in first buffer and add alphas at second buffer(screen). _______________________________________________ Render mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/render
