Animated textures with interpolation differ to vanilla
pau101 opened this issue ยท 6 comments
Version information
mc1.18.1-0.4.0-alpha6
Expected Behavior
Animated textures with "interpolate" enabled to not mix the alpha channel between frames.
Actual Behavior
The alpha channel is mixed between frames.
Reproduction Steps
- "texture_updates" mixin config enabled
- Observe "interpolate" animated texture with translucency blending
Java version
Java 17
CPU
Intel Core i7-8700
GPU
NVIDIA GeForce GTX 1070
Additional information
Reproduction pack with animated apple: sodium-issue-1188.zip
Without sodium translucency jumps between frames, while with sodium blended.
I don't see why this would be considered a bug in Sodium. Personally, I'd expect the translucency to get blended, otherwise, you'd have one channel that jumps while the others don't. This is more likely a bug with Minecraft itself.
In fact, there is already a bug report on Mojang's bug tracker for this:
It should be possible to add a tag to the animation metadata to enable the alpha blending behavior. I do think that blending the alpha is the correct way to do this but it's likely possible to do both.
It seems this is a bug in vanilla with how it handles the alpha channel, and while Sodium is doing the correct thing, it doesn't match vanilla... so really it's our bug.
I really don't like re-implementing bugs but we should probably fix this, since this changes some resource packs substantially.
