[Bug 746209] Merge glfiltersobel, glfilterblur and glfilterlaplacian into gleffects

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746209

Michał Dębski <debski.mi.zd at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #300070|0                           |1
        is obsolete|                            |

--- Comment #16 from Michał Dębski <debski.mi.zd at gmail.com> ---
Created attachment 301014
  --> https://bugzilla.gnome.org/attachment.cgi?id=301014&action=edit
0005-gleffects-Merge-laplacian-filter-into-effects

I have also fixed the shader, because it was substracting alpha channel as well
as color channels resulting in completely transparent color and I have added
invert property similar to sobel effect.
I also did version for GLES, but I'm not able to test it (it is the same as
other convolution effects so it should work in theory). However I did not
correct the issues described in the comment above shader source so I didn't
move it into gleffectssources.c.

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