fix ospray denoising with gpu enabled
The pre-ospray 3 denoising input buffers are host allocated. These are not gpu readable which oidn detects but silently ignores. This solution uses oidn 3's buffers to manage residency.
The pre-ospray 3 denoising input buffers are host allocated. These are not gpu readable which oidn detects but silently ignores. This solution uses oidn 3's buffers to manage residency.