Libgdx Saving Textures To Avoid Context Loss

I have a texture in my LibGDX based Android app that is created procedurally through FrameBuffers that I need to preserve through context loss, and it seems that the only efficient

Solution 1:

The PixmapIO class is supposed to help with writing a run-time generated pixmap out. Its not quite what you're looking for with an FBO texture, though. (Its easy to go from Pixmap to Texture, but not so easy to go the other way.) If the primitives you use to generate the data in your FBO are available on Pixmap (e.g., the basic geometric primitives), that may be an alternative. I believe this is the closest libGDX comes to a supported mechanism for saving a run-time texture, but I'm not positive.

There is some libGDX code around for scraping bytes off the framebuffer (the texture data of an FBO all lives on your GPU, so you need to jump through some hoops to copy it into normal memory). See ScreenUtils and the links here about screenshots and PNGs.

It should be easy to adapt the PixmapIO to write out a "CIM" formatted file using the byte[] returned from on of the ScreenUtils methods.

Alternatively, you could track the list of "operations" that were done to the FBO, so you can just replay them (reconstructing the content later). It depends a lot on what's going into your texture, though ...