Implement raytraced skinned mesh

[maidopi-usagi]

Adds initial ray traced skinned mesh support.
Skinned and blend shape surfaces now get per-instance BLAS data built from their deformed vertex buffers, so animated meshes can be included in the path tracing path. There’s also a BLAS update/refit path wired through RD and Vulkan to avoid full rebuilds when possible.
Motion vectors for skinned hits are calculated from previous-frame vertex data.

[Bonkahe]

Does seem to work as intended, there's quite a lot of shaders in my current project that don't play well with path tracing, but I decided to test it in there and here is the results.

There is an issue when pausing the scene tree where motion vectors are not being updated, I'm assuming this was not introduced by this PR but worth a note:

The gifs don't really do it justice, it looks quite good xD

[maidopi-usagi]

There is an issue when pausing the scene tree where motion vectors are not being updated, I'm assuming this was not introduced by this PR but worth a note:

repushed a fix. now won't write velocity buffer when skinning not triggered last frame.

[lsikkesNV]

Awesome, thanks for the work :) I'll take this one and rework it a little bit so it will also work for custom GLSL shading such as tree sway and whatnot

[lsikkesNV]

I just pushed a change that fixes multi viewport.. it conflicts a little with your changes (seperate per viewport state, because TLASes and such can diverge due to visibility ranges or LOD)

[maidopi-usagi]

Awesome, thanks for the work :) I'll take this one and rework it a little bit so it will also work for custom GLSL shading such as tree sway and whatnot

rebased~ shall i change naming from skinning to a wider one, like "deformable" or something else for vertex shaders.

[lsikkesNV]

Yeah I think that makes sense indeed

[maidopi-usagi]

renamed. also introduced RTDeformedGeometrySource for further deforming types.

[johnlogostini]

I don't know what exactly was changed, but when I tried this PR the other day it was working. As of now, no skeletal meshes are rendered with Path-Tracing, and now they are also broken in Rasterization for some reason.

I have done zero debugging on this so far, but thought it was worth mentioning.

Path-Tracing

Rasterization

[maidopi-usagi]

I don't know what exactly was changed, but when I tried this PR the other day it was working. As of now, no skeletal meshes are rendered with Path-Tracing, and now they are also broken in Rasterization for some reason.

Thanks for testing! That's a bit weird. Actually there's not any change in skinned mesh storage/rendering path in the latest commit(0ef2c8f) , and my local test project seems fine.

Do you remember the last working commit?

[johnlogostini]

No, I don’t remember the commit, but it was before Bonkahe committed, so 5 days ago.

[maidopi-usagi]

No, I don’t remember the commit, but it was before Bonkahe committed, so 5 days ago.

Well, that should be the first version commit before rebasing, I'll take a look on if I broke anything. (an MRP will be helpful)

BTW have you tried deleting .godot cache files?

[johnlogostini]

I will get you a minimum reproducible example in a few hours, and no, I did not remove my local project changes. I can try doing that.

[lsikkesNV]

Just tested it here locally, I've got it to work (master chief and all)

[lsikkesNV]

It's now integrated @maidopi-usagi - had to change it a little bit to handle the buffer addresses from being barriered correctly (was causing crashes otherwise in games). I'll close this one. Thank you for contributing!