Questions about exposure setting

[Defair]

Dear streamline developers, what will happen if I set exposure value to sl::DLSSOptions::exposureScale While not tag exposure texture or Tag a null to it？Is this allowed and correct？The reason why I do this is my engine calculate exposure in CPU side，not GPU side. Although I can create a texture or buffer, upload exposure value to it. But I want to know, could I skip this step, just set exposureScale instead. Thank you very much.

[jake-nv]

If you look at dlssEntry (https://github.com/NVIDIA-RTX/Streamline/blob/main/source/plugins/sl.dlss/dlssEntry.cpp#L720) the values are passed to NGX, so that's where the usage rules come into play. Exposure parameters are covered in 3.9 of DLSS Programming Guide. But, if no exposure texture is set I believe those values are just ignored. You can also instead use "auto-exposure".

[jake-nv]

Ah, right and if you don't tag an exposure texture SL automatically enables auto-exposure: https://github.com/NVIDIA-RTX/Streamline/blob/main/source/plugins/sl.dlss/dlssEntry.cpp#L414

See:
https://github.com/NVIDIA-RTX/Streamline/blob/main/docs/ProgrammingGuideDLSS.md#40-tag-all-required-resources