Support for 3D textures above 4gb

[georgeouzou]

Is there any way KTX can support 3d textures with mipmaps
with total size exceeding 4gb?

[MarkCallow]

There is nothing limiting the total size of a KTX file, except the file system on which it resides. Each mip level is limited to 4GB though due to the 32-bit "imageSize" field that gives the level's size. Do you need mip levels larger than 4GB? Note that here a level's size includes all array layers and all faces.

[georgeouzou]

Yes the base 3d image (mip level) is above 4gb in size. The rest of the KTX file format fields can support this easily, but the 32-bit "imageSize" field cannot.

[MarkCallow]

Good to know. I'll keep it in mind for the next version of the KTX format.

[MarkCallow]

KTX2 supports mip levels > 4GB. KTX never will.

[georgeouzou]

Ok thank you!