[Mesa-dev] [PATCH 14/20] mesa: Add non-normalized formats support for ubyte packing functions

[Samuel Iglesias Gonsálvez]

On Thu, 2014-11-20 at 09:55 +0100, Iago Toral wrote:
> On Thu, 2014-11-20 at 08:15 +0100, Samuel Iglesias Gonsálvez wrote:
> > On Tue, 2014-11-18 at 11:08 -0800, Jason Ekstrand wrote:
> > > 
> > > 
> > > On Tue, Nov 18, 2014 at 12:44 AM, Iago Toral Quiroga
> > > <itoral at igalia.com> wrote:
> > >         From: Samuel Iglesias Gonsalvez <siglesias at igalia.com>
> > >         
> > >         Signed-off-by: Samuel Iglesias Gonsalvez
> > >         <siglesias at igalia.com>
> > >         ---
> > >          src/mesa/main/format_pack.c.mako | 10 +++++++++-
> > >          1 file changed, 9 insertions(+), 1 deletion(-)
> > >         
> > >         diff --git a/src/mesa/main/format_pack.c.mako
> > >         b/src/mesa/main/format_pack.c.mako
> > >         index b9f4656..97adf6e 100644
> > >         --- a/src/mesa/main/format_pack.c.mako
> > >         +++ b/src/mesa/main/format_pack.c.mako
> > >         @@ -84,7 +84,15 @@ pack_ubyte_${f.short_name()}(const GLubyte
> > >         src[4], void *dst)
> > >                %endif
> > >         
> > >                ${channel_datatype(c)} ${c.name} =
> > >         -      %if c.type == parser.UNSIGNED:
> > >         +      %if not f.is_normalized():
> > >         +         %if c.type == parser.FLOAT and c.size == 32:
> > >         +            UBYTE_TO_FLOAT(src[${i}]);
> > >         +         %elif c.type == parser.FLOAT and c.size == 16:
> > >         +            _mesa_float_to_half(UBYTE_TO_FLOAT(src[${i}]));
> > > 
> > > 
> > > Same question here as in the previous patch.  Why are we using
> > > UBYTE_TO_FLOAT?
> > > 
> > 
> > This is what current format_pack.c is doing for those formats and some
> > piglit tests complain if it is not there.
> > 
> 
> Jason, this looks correct to me: we are packing from an ubyte type to a
> half float type, so first we need to convert from ubyte to float and
> then downgrade the float to a half float, we don't currently have means
> to convert directly from an ubyte to a half float, right?
> 
> Iago
> 

Notice that we are converting from ubyte type source to float formats,
hence the use of UBYTE_TO_FLOAT().

I'm going to split the conditions in two (one for converting to non
integer formats, other for non normalized integer formats) to make it
clearer.

Sam

> > >  
> > >         +         %else:
> > >         +            (${channel_datatype(c)}) src[${i}];
> > >         +         %endif
> > >         +      %elif c.type == parser.UNSIGNED:
> > >                   %if f.colorspace == 'srgb' and c.name in 'rgb':
> > >                      util_format_linear_to_srgb_8unorm(src[${i}]);
> > >                   %else:
> > >         --
> > >         1.9.1
> > >         
> > >         _______________________________________________
> > >         mesa-dev mailing list
> > >         mesa-dev at lists.freedesktop.org
> > >         http://lists.freedesktop.org/mailman/listinfo/mesa-dev
> > > 
> > > 
> > > _______________________________________________
> > > mesa-dev mailing list
> > > mesa-dev at lists.freedesktop.org
> > > http://lists.freedesktop.org/mailman/listinfo/mesa-dev
> > 
> > 
> 
> 
> 


-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: This is a digitally signed message part
URL: <http://lists.freedesktop.org/archives/mesa-dev/attachments/20141120/c898c8a5/attachment.sig>