Batch skinned meshes

[tygyh]

Objective

• Finishes Batch skinned meshes #10094.

Solution

• Rebase and solve change conflicts.

[re0312]

seems broken in window, cargo run --release --example many_foxes get panic,

thread 'Compute Task Pool (1)' panicked at C:\Users\27135\.cargo\registry\src\index.crates.io-6f17d22bba15001f\wgpu-0.19.1\src\backend\wgpu_core.rs:3009:5:
wgpu error: Validation Error

Caused by:
    In Device::create_bind_group
      note: label = `skinned_mesh_bind_group`
    Buffer usage is BufferUsages(COPY_DST | STORAGE) which does not contain required usage BufferUsages(UNIFORM)

[tygyh]

seems broken in window, cargo run --release --example many_foxes get panic,

Yes, I believe the problem has to do with the if statement in the skinning function in mesh_bindings.rs. I do not know how to fix it though.

[Elabajaba]

I got it compiling, but now it's complaining because mesh from the let skin_index = mesh[vertex_no_morph.instance_index].skin_index; in the shaders doesn't exist.

[re0312]

What the state of this pr ,It seems still can not work correctly now, Could I try to finish this pr ?

[tygyh]

@re0312 Go right ahead

[re0312]

@re0312 Go right ahead

I fixed some errors and tested this pr on windows and web ,but I can not push my code to your branch(I must have done something wrong and i have no idea how to resolve it) ,Could you please pull my code from my forked branch into current pr or should I open a new pr?