On 10/15/06, Roland Scheidegger <[EMAIL PROTECTED]> wrote: > Jerome Glisse wrote: > >>> According to fragment program extension, TEX, TXP, ... should > >>> give you the right A value (Ap depending on which texture unit > >>> you are using). > >> That's not how I read that. TEX,TXP,... refer to texture sampling > >> only, there is no thing as previous unit there. Thus, for an RGB > >> texture, A should be always 1. > > > > What induced me to this , is that in fragment program extension > > description they say to look at table 3.21 and in this one there is > > reference to Ap for A in RGB. Anyway i think you are right here. > What version of the spec are you using? Table 3.21 only lists the > component mapping here.
I used 2.0 spec, i shouldn't, looking at 1.5 and table 3.21 is not referencing same table. > Well, if my theory is sound, then the glean pixelFormats test is wrong. > I've tried to trivially fix it up and also made it possible to use tex > env combine mode. I think this might break the glDrawPixels tests but > oddly enough that didn't happen. I did get a lots of failures though > with an old radeon (and I'm sure r200 will fail too), turns out it > uncovers some driver bugs... radeon and r200 only have an i8 > single-component format, and you can't use that for a8 or l8 as the > alpha (or rgb respectively) values will be wrong - guess there was a > reason those formats weren't used initially... (not sure exactly why it > doesn't work for L8, as I'd think if the ALPHA_IN_MAP isn't set this > should work). I'm not quite sure how to fix that, the by far easiest > method is to just use al88, but it would be possible to hack up tex env > instead (and for the r200, fragment shader progs too - ugh). Anyway, > r300 shouldn't have that problem with its native texture sampling > swizzling/component replace. > > Roland > > Jerome Glisse ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel
