(H)ybrid high-(Q)uality (A)nti-(A)liasing (HQAA)

I think I've managed to fix it, if the error you're getting is a NaN/Infinity literals not allowed by shader model. I managed to reproduce the behavior on Borderlands TPS (oddly, it failed to compile in setup mode and compiled properly in performance mode...). It was one particular offending term tied to the edge threshold causing the issue, and the fix was super janky - I flipped the numerator and denominator in each one causing an error and either added or removed rcp (based on whether rcp was already being used).

that was indeed the error ill post back later today sometime if its solved the issue on my end. As far as the fix goes would this cause any bugs in terms of how it is meant to function ?

No. Rcp just calculates the reciprocal (1/x) - when used on an explicit division it's identical to reversing the positions of the numerator and denominator. The reason this is janky is because the compiler chokes on it one way, but not the other, yet both are functionally identical.

v29.2 is now available, and although the changes are functionally minor, they make a big difference to the output quality in most cases. HQAA's optional CAS sharpening has some new tricks up its sleeve that, combined with improved calibration of the defaults and global presets, leave scenes looking nice and sharp without really over- or under-sharpening anything.

Hello, where can I download the shader? Copying the code from here does not work, gives a compilation error

Direct link: github.com/lordbean-git/HQAA

Also can be found on the 1st page in the beginning of the 1st message by lordbean, hyperlinked as # HQAA.

v29.3 is now available, featuring a major optimization of the FXAA code that significantly improves both performance and output quality and a new "Lossless Mode" global preset, which is designed to retain the maximum possible amount of detail in the scene after processing. This version is worth updating to for the performance improvements alone as it runs significantly faster than any prior version of HQAA.