On 9 June 2013 03:30, Chris Forbes <chr...@ijw.co.nz> wrote: > I noticed that if you write gl_BackColor but not gl_FrontColor, the > value that lands in gl_Color in the fragment shader is junk; same for > the corresponding secondary color builtins. This causes us to fail 12 > of the interpolation piglits. > > There's a series from July of last year which was supposed to fix this: > > http://lists.freedesktop.org/archives/mesa-dev/2012-July/024117.html > > ... but it looks like it went nowhere. > > What's the current thinking on this? I'm happy to do the work if > there's some consensus. >
BTW did you notice that Olivier also sent out a second version of the series? It's here: http://lists.freedesktop.org/archives/mesa-dev/2012-July/024333.html I'd love to see this get picked up again. Reading through the comments on version 2 of the series, it looks like a decision got made on how to handle all the outstanding issues except for one: how do we handle vertex shaders that write to gl_BackColor but not gl_FrontColor? (See the discussion here: http://lists.freedesktop.org/archives/mesa-dev/2012-July/024153.html). Unfortunately I don't remember the issues involved well enough to have a coherent opinion. I would appreciate hearing what you think. Once that issue gets resolved, it looks like it's a fairly simple matter of taking Olivier's second series, making the fixes suggested by Eric in his review comments, and turning it into a v3 series. I'd say go for it.
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