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Exploring ways to mipmap alpha-tested textures
In my village building game I'm using alpha-tested transparency for foliage — trees, bushes, grass, etc. This works simply by discarding (i.e.
Something like 0.3 probably works, but it makes the flower texture really blobby & fractured, while also introducing a ton of artifacts due to some very transparent areas becoming erroneously visible. We can see that it doesn't actually suit my case: by preserving the coverage value, it fills some holes in the texture at the expense of thinner features, thus once again shrinking the overall shape. So, to fix the color leaking problems, what I decided to do is first compute the mipmaps using usual averaging, and only then replace the alpha channels (starting from level 1) with max-downsampled SDF.
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