Overlay uses wrong size when reusing OpenGL texture name.

[matzman666]

When applying an OpenGL texture to an overlay and the texture name that has already been used for an overlay texture before, the wrong size is used for the overlay.

How to reproduce:

• Create OpenGL texture, create Overlay and apply texture to overlay.
• Delete texture and overlay.
• Wait for glGenTextures to reuse the texture name of the deleted texture.
• Create new OpenGL texture using the same texture name as the previous texture but with different size.
• Create overlay and apply texture to overlay.
• Result: Overlay uses the size of the already deleted previous texture and not the one of the new texture.

[McKay42]

This might be related to https://github.com/ValveSoftware/openvr/issues/216 and the caching of the texture/rendertarget size. Seems that it is only stored once, and then never invalidated.

[RustyPaint]

Similar problem. I'm using a tracked controller attached overly to display a status message. Basically the update is done like this:

Existing overlay is visible. Compute new message size. Compute new width based on message hight. Upload new texture to GL keeping same glBindTexture target. Set overlay width. Set overlay texture (with the same bind target).

There is a timer that will hide the message overlay after two seconds of no updates.

If the texture for the message changes size (do to the message changing), the overlay will show the old texture until some magic cached texture size is flushed in OpenVR. The "flush" is kind of random since it can sometimes update if there is a pause before the next texture upload or when the overlay is hidden for a short period before being shown again. Trying to hide, wait 3 frames and then show again is not enough for the magic "flush".

So I guess the question is, is there a way to flush the cached texture size?