The sharpening pass in DLSS-IV.asi is a port to HLSL of the RCAS filter
(FsrRcasF) from AMD FidelityFX Super Resolution 1, ffx_fsr1.h v1.20210629,
modified by this project. AMD publishes it under the MIT licence, reproduced
below as it appears in that file. The MIT licence requires this notice to
travel with every copy, which is why this file is here.

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