Storing computations of vertex shader in buffer

[noergel1]

Hey,

is it possible to store computations done in the vertex shader persistently, so that they don't have to be redone every frame?
I want to implement triplanar mapping, so I'd like store the calculated UVs in a buffer.

Thanks for your help!

[bejado]

Yes, you can store any computation you want inside vertex attributes. We provide 8 attributes for your own use: custom0-7. Then, in the material you can mark them as "required" and access them via getCustom0(). https://google.github.io/filament/Materials.html#materialdefinitions/materialblock/vertexandattributes:requires

Note that these attributes must be computed on the CPU.

[noergel1]

Yes, you can store any computation you want inside vertex attributes. We provide 8 attributes for your own use: custom0-7. Then, in the material you can mark them as "required" and access them via getCustom0(). https://google.github.io/filament/Materials.html#materialdefinitions/materialblock/vertexandattributes:requires

Note that these attributes must be computed on the CPU.

Alright, thank you. I actually hoped there'd be a way to store GPU computations in a buffer, do you happen to know if thats planned to be implemented?

[bejado]

We're eventually adding support for SSBOs (we already have some support for them internally), but this work isn't completed yet and we don't have a definite timeline.