Activating use_texture_padding disables mipmaps (Atlas)

[kozlown]

Godot version

v4.0.2.stable.official [7a0977ce2] v4.0.3.stable.official [5222a99f5]

System information

Ubuntu 20.04.6 LTS

Issue description

Activating property use_texture_padding for an Atlas disables mipmaps for this atlas.

Activating the property use_texture_padding should not disable mipmaps because it makes impossible the creation of clean HD-2D maps with zoom/unzoom.

Steps to reproduce

1. Create a Tilemap Node
2. Add a new Tileset to the Tilemap.
3. Import a new texture from an HD image with the property mipmaps/generate activated.
4. In the Tileset Pannel, add a new Atlas using the previously imported texture.
5. Add some tiles to the map.
6. Try activating/disabling the property use_texture_padding of the atlas and zoom/unzoom to check if the map looks pixelated (= mipmaps not used)

Minimal reproduction project

Test use_texture_padding and mipmaps.zip

[Calinou]

cc @groud

I discussed this on Discord with OP. To resolve the issue, we should probably generate mipmaps automatically after creating padding if the source texture also has mipmaps enabled.

[groud]

I discussed this on Discord with OP. To resolve the issue, we should probably generate mipmaps automatically after creating padding if the source texture also has mipmaps enabled.

Hmm, if you take a TileSet texture and generate mipmaps for it, then pixels will end up blurred, and texture bleeding is bound to happen anyway. So I am not sure that texture padding is very useful when mipmaps are enabled (it might help, but the problem will be visible anyway).

I see several solutions:

• Disable or display a warning when you use texture padding with mipmaps.
• Allow texture padding to add more padding pixels for higher mipmaps levels. That's not optimal, but it might mitigate the texture bleeding on higher levels too.
• Generate the mipmaps in a smarter way, by blurring each tile individually, not as a whole image. This is the best solution but it might not be easy to implement.