How to buffer CompositorEffect postprocessing?

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Godot Version

4.6.3

Question

I created a CompositorEffect compute shader that cannot not write back directly into the “color_image”, because it can’t be parallel. so I created a tmp buffer. I saw examples where they have a 2nd shader that copies the buffer back to the image, eg: Godot-HBAO/addons/Godot_HBAO at main · KawaiiPrincess/Godot-HBAO · GitHub
but that seems to be too complicated.

I tried to use rd.texture_copy or td.texture_update, but it seems the screen buffer does not have the correct access bits set. but updating the image in the compute shader works… so I wonder why?

thanks.