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God Ray effect (light scattering) with Mali GPU

Note: This was originally posted on 10th May 2012 at http://forums.arm.com

Hello everyone,

I'm implementing the God Ray effect for an Android game on Mali-400 based devices (here is Samsung I9100 and Samsung I9300).
I've followed this article http://fabiensanglard.net/lightScattering/index.php
But the effect is not good (as you can see in the attached file).
It did work on Win32 and other Adreno and PowerVR based devices.
I think that there's problem with the texture's coordinate fetch from vertex shader to fragment shader, the interpolation computation may cause this issue.

I hope that you can give us some idea on this.

Thank you.

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0 Peter Harris over 10 years ago in reply to John

This was an old post bulk imported from our old forums, which have now been retired. I suspect it was an issue with the import which means this has unfortunately likely vanished into the mists of history.
HTH,
Pete
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0 Peter Harris over 10 years ago in reply to John

This was an old post bulk imported from our old forums, which have now been retired. I suspect it was an issue with the import which means this has unfortunately likely vanished into the mists of history.
HTH,
Pete
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0 John over 10 years ago in reply to Peter Harris

Autch, that is bad news indeed .
Thank your for your time tho.
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0 Alban Rampon over 10 years ago in reply to Peter Harris

That's correct. A dodgy API which ate a few formatted post.
I looked and it hasn't been discussed on Jira, unfortunately.
Maybe petehorsman remembers what it was about?
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