[Bug 737505] gltestsrc: implement checkers pattern in GLSL

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=737505
  GStreamer | gst-plugins-bad | git

comicfans44 <comicfans44> changed:

           What    |Removed                     |Added
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 Attachment #287268|0                           |1
        is obsolete|                            |

--- Comment #2 from comicfans44 <comicfans44 at gmail.com> 2014-09-29 07:48:02 UTC ---
Created an attachment (id=287321)
 View: https://bugzilla.gnome.org/attachment.cgi?id=287321
 Review: https://bugzilla.gnome.org/review?bug=737505&attachment=287321

v2 fix inconsist bug

(In reply to comment #1)
> Review of attachment 287268 [details]:
> 
> This seems to have blocks that are twice the size of the videotestsrc ones.
> 
> Also, this is black/white whereas videotestsrc works on red/green.

sorry for the inconsist bug, I'm not sure if this is suitable implementation,
so just did a quick hack ...

> 
> gltestsrc pattern=checkers-8 ! glvideomixer ! glimagesink seems to produce
> weird artifacts when used together.  Probably because you're not writing to the
> alpha channel in the shader.
> 
fixed 

> There is also the checker shader in glvideomixer if you want to use it.
I'm not sure whether to use it , since conditional statement in shader may hit
some old hardware performance(I didn't test it ,maybe doesn't matter )

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