when KhronosGroup anounced Vulkan back then, they also announced a whole set of software, that can handle all the new formats, that they introduced.

One format in particular peaked my interest recently, which is ktx2. It's an image format, that can be multilayered, and supercompressed, has inline mipmapping, and most importantly: streamed directly to the GPU, without involving the CPU basically at all.

Now here comes the kicker. If i want to use this format (mind you: Vulkan is around for a while now) for creating Skyboxes, there is only a single tool, that can properly convert hdr images to ktx2, and it only works on windows. Oh and there are no binaries, so in every case you have to compile it yourself.

Ah and then i thought, okay what if i then already render the cubemap faces and assemble them by hand into the cubemap, because _some_ ktx tools work on linux, then that should work right? wrong. When assembling it, it turns out, that now it's a 2D image instead of a 2DArray image with one element (which apparently is not the same for skyboxes)

Why is this shit such a pain in the ass?

Like.. I'm currently rendering equirectangular hdr images on my linux machine, then move these (usually 100MB) files over to some windows PC, convert it there into ktx2 cubemaps and then move it back. And everytime i need to do a change on the skybox, i have to repeat this whole nonsense. Ah.. and this tool doesn't even properly work on Windows, like you can't just disable mipmaps or change the filtering, because then the skybox is just black for some reason.

The funniest thing is, at the end of the day, these ktx2 files work on linux, as well as windows, mac and even mobile platform, so there's really no reason, that the conversion tool only works on one of them systems.

But hey, at long last i got them working, and this stuff looks quite nice now 👌