djeedai / bevy_hanabi / 5802442562

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Add alpha masking (#214)

Add an alternative alpha blending mode, alpha masking, based on a cutoff
threshold, and producing opaque particles emitted into the `AlphaMask3d`
render phase (for 3D views).

Add a new `BuiltInOperator::AlphaCutoff` to allow accessing and
modifying that cutoff value from the fragment shader.

Allow the render context to evaluate expressions, and add the missing
access to simulation parameters.

Update the billboard example to use alpha masking with a dynamically
varying alpha cutoff driven by the simulation time.

260 of 260 new or added lines in 5 files covered. (100.0%)

2602 of 5056 relevant lines covered (51.46%)

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