[ pd-gem-Feature Requests-2844090 ] get rid of upside down images - GEM-dev

26 Jan 2010


      Feature Requests item #2844090, was opened at 2009-08-25 09:59
Message generated for change (Comment added) made by zmoelnig
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Category: image processing
Group: None
Status: Open
Priority: 5
Private: No
Submitted By: IOhannes m zmlnig (zmoelnig)
Assigned to: IOhannes m zmlnig (zmoelnig)
Summary: get rid of upside down images
Initial Comment:
for performance reasons, Gem handles images with the origin in the lower-left corner (standard openGL image orientation) and images originating in the upper-left corner (standard for most(?) video codecs).
this makes code unnecessarily complicated, as textuing has to take care of both types of images.
since most video-decoding and -capturing APIs will naturally (for performance reasons) return images originiating in the upper-left corner, it would be good to make this the default orientation and get rid of standard-openGL-originating images alltogether.
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Comment By: IOhannes m zmlnig (zmoelnig)
Date: 2010-01-26 16:23
Message:
all the pix-acquisition is now done in topleft orientation.
still looking for a way to deal with readback of textures/framebuffers:
http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Numb...
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Comment By: IOhannes m zmlnig (zmoelnig)
Date: 2009-08-25 10:01
Message:
the only problem i can see with getting rid of standard-openGL-orientation
is when it comes to dealing with generated textures ([pix_snap],
[pix_snap2tex], [gemframebuffer])
there must be some way to rotate these on the GPU...
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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=507082&aid=2844090...