No way to get number of loaded mipmap levels. about ktx-software HOT 5 CLOSED

The loader already sets GL_TEXTURE_MAX_LEVEL when compiled for a version of OpenGL {,ES} that supports it, i.e. GL_TEXTURE_MAX_LEVEL is defined in gl.h. You can use glGetTexParameter to retrieve this value. Does this meet your need?

I have now documented this in the docs for the ktxLoadTexture* functions. Sorry for the oversight.

I can consider changing this to a run-time rather than compile time choice, based on whether the GL context supports the parameter. Would this help?

from ktx-software.

Thanks. Seems that I was using some ancient version of libktx that didn't do that yet.

The only problem that I see is that I'm also building an OpenGL ES2 app on iOS. It supports max level with an extension where the same define is called TEXTURE_MAX_LEVEL_APPLE. So it would probably only work with a runtime check (or minor hacking).

from ktx-software.

I'll be happy to accept a pull request to make this work on iOS. I'm busy working on a KTX loader for Vulkan right now so I won't be able to look at this myself for a while.

from ktx-software.

Yeah, no problem. I already have the old version working with a minor hack and I'm also quite busy now so I won't be updating to the newer lib quite yet. But I'll probably do it at some point.

from ktx-software.

This is fixed in the new API currently in incoming. The ktxTexture object created when loading a file has a field giving the number of mipmap levels in the file.

from ktx-software.