[osg-users] Proper way to call glClearTexImage?

[OpenSceneGraph Users]

I have an image buffer that is written to and read by shaders every frame. 

I need to clear the image on the GPU back to a starting value as 
efficiently as possible before the shaders run.  

It seems I could use the glClearTexImage function.  

Do I need to place this in a DrawCallback or is there a more appropriate 
location for this?

Thanks,
Rob

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