@rygorous Er, since when are mipmap sizes rounded up from the previous dimension

[ericlasota@mastodon.gamedev.place]

@rygorous Er, since when are mipmap sizes rounded up from the previous dimension?

If I feed a 123x456 image to texconv, the first mip is 61x228. Vulkan Images chapter apparently doesn't specify rounding (time for a bug report!), ARB_texture_non_power_of_two spec explicitly rounds down, DirectXTex rounds down, NVIDIA's got a paper on this saying round down, and I've been dealing with this issue directly for a couple months.

[tomf@mastodon.gamedev.place]

@EricLasota @rygorous Huh. I was also sure it rounded up, but nope - the spec in DX11.3 is clear - it rounds down.

[ericlasota@mastodon.gamedev.place]

@TomF @rygorous The Vulkan spec actually says round up but the validation layer rounds down, whee

edit: Bug report deployed! https://github.com/KhronosGroup/Vulkan-Docs/issues/2588