first let me separate the framebuffer data from GL data by four more spaces.
> >>>>> MGA > >>>>> r g b a amask bsz ar ag ab aa Xvisual dpth > >>>>> 5 6 5 0 00000000 16 16 16 16 0 16 > >>>>> 8 8 8 8 00000000 32 16 16 16 0 24 > >>> > >>> alphaMask should be 0xff000000. > >> > >> In the argb8888 READ_RGBA in mgaspan.c, alpha is always > returned as > >> 255. One or the other of these is wrong. > > > > Hmmm, I don't remember if the g200/400 supports dest alpha. > The span > > functions would seem to indicate "no". > > I've changed the mga_dri.c to report 0 for alpha bits, and 24 > as the buffer size. Then result should be: MGA r g b a amask bsz ar ag ab aa Xvisual dpth 5 6 5 0 00000000 16 16 16 16 0 16 8 8 8 0 00000000 24 16 16 16 0 24 it seems that no one never ever tried that alpha bits or used the bsz value. > >>>>> GLINT > >>>>> r g b a amask bsz ar ag ab aa Xvisual dpth > >>>>> 5 5 5 5 000f1000 16 16 16 16 0 15 (pScrn->depth) > >>>>> 8 8 8 0 00000000 32 16 16 16 0 24 (pScrn->depth) > >>>> > >>>> This might be right. > >>> > >>> Looks OK. > > > > >> Shouldn't the buffer size be 24 here? > > > > Ooops, yes. > > Fixed. Assumed result: GLINT r g b a amask bsz ar ag ab aa Xvisual dpth 5 5 5 5 000f1000 16 16 16 16 0 15 (pScrn->depth) 8 8 8 0 00000000 24 16 16 16 0 24 (pScrn->depth) Hey and why does 5+5+5+5 = 20, but sum up to 24 in your sheme? i mean the alpha bits would be only 1 bit (my prefrered thing, matches Xvis) or the bsz is truely 24 for the first line. (dont like that) here my prefered fix: GLINT r g b a amask bsz ar ag ab aa Xvisual dpth 5 5 5 1 00008000 16 16 16 16 0 15 (pScrn->depth) 8 8 8 0 00000000 24 16 16 16 0 24 (pScrn->depth) sorry i dont have that hardware handy or any specs nearby. -Alex. ------------------------------------------------------- This SF.NET email is sponsored by: SourceForge Enterprise Edition + IBM + LinuxWorld = Something 2 See! http://www.vasoftware.com _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
