Bevy 0.7

[Shatur]

Updated to Bevy 0.7. Here are PRs which I used as a reference for update:

• [Merged by Bors] - Mesh vertex buffer layouts bevyengine/bevy#3959
• [Merged by Bors] - Compute Pipeline Specialization bevyengine/bevy#3979
• [Merged by Bors] - Faster view frustum culling bevyengine/bevy#4181
• [Merged by Bors] - Use storage buffers for clustered forward point lights bevyengine/bevy#3989

But it's a draft since I faced the upstream issue: bevyengine/bevy#4507
To make it work I need MaterialPipelineKey to have public fields as it was before (before it was a simple tuple). Should be fixed with bevyengine/bevy#4508

[sax]

I was investigating this repo and was unable to compile either the main branch or this branch. Looking at head of bevy itself, I see that a whole lot has changed recently. I was playing around with fixing the compilation errors against bevy head, and got as far as this: https://github.com/sax/bevy-hikari/tree/bevy-0.8. This does not compile yet, and I'm not sure I can get too much further without diving pretty deep into bevy's internals. Anyways, I offer it as a start, in case it's useful.

[Shatur]

@cryscan have a 0.8 branch that uses a different mechanism, but it's not ready yet.

[sax]

@Shatur whatever you have is likely more correct than my version. I'm just getting into bevy, and see that even what I understand is rapidly changing. Hopefully what I did today is in some way useful to you.

[Shatur]

Superseded by #8.