ReinUsesLisp 488ed8bd02 vk_rasterizer: Add lazy default buffer maker and use it for empty buffers
Introduce a default buffer getter that lazily constructs an empty
buffer. This is intended to match OpenGL's buffer 0.

Use this for disabled vertex and uniform buffers.

While we are at it, include vertex buffer usages for staging buffers to
silence validation errors.
2020-04-21 19:55:52 -03:00
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