djeedai / bevy_hanabi / 8349257460

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Write to depth buffer in alpha mask mode (#305)

When rendering particles in alpha mask mode, there's no transparency
involved; each fragment is either fully opaque or fully transparent.
Therefore we can use the depth buffer, and don't need some fancy order
independent transparency rendering or distance based sorting (which are
not implemented).

This change enables depth writing when rendering particles through the
`AlphaMask3d` render pass. This prevents particles from flickering, as
visible in the `billboard.rs` example.

Partially fixes #183 (for non-transparent effects)

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