save/restore background in Modeling app

I know this has been discussed in the past, but I am trying to figure out the best way to save/restore the background in a modeling app (not a game). I have been using glReadPixels/glDrawPixels to system memory, which seems to work consistently, but slowly.

I just recently implemented the KTX_buffer_region extension, and performance has improved immensely. The problem with this is that it appears to be flakey on a number of devices (drivers), and is not uniformly supported.

We use multiple overlapping windows under Windoze, and when we switch context or try to re-allocate the “region buffers” for a window resize, it often crashes the driver.

I have tried to find information on using this extension, but it is not well documented.

Is there an alternative that is better supported and provides the speed of KTX_region_buffer?

John Lynch

WGL_ARB_buffer_region should work better. At least it’s documented – you can get the specification from the extension registry.

– Tom

can you show me how to use KTX_buffer_region?And where can i download it?