SMAA 1x, Enhanced Subpixel Morphological Antialiasing (Jimenez, Echevarria, Sousa, Gutierrez), MIT (LICENSE.txt).
From https://github.com/iryoku/smaa at commit 71c806a838bdd7d517df19192a20f0c61b3ca29d, unmodified:
  SMAA.hlsl        SMAA.hlsl            sha256 4db53d92ef0b45661f8450303589ffabce93c352cae4282a6f32dd2b80efbeb9
  AreaTex.h        Textures/AreaTex.h   sha256 1933bf43ce86ba71f7ed5f0fa94b148610c634dc3395b9bc67a817d51ee73af2
  SearchTex.h      Textures/SearchTex.h sha256 1fac315ab5f87b60083c9b8387af17f056204d3d1bf21500f2acc5b3e8c1a37a
  LICENSE.txt      LICENSE.txt          sha256 2b848b67ba50ac40b53e11cf1ccdaee2a190ca83b4652cba695a5f1ce81f52ae
Used by runtime/gfx/smaa_present.inc; smaa_src.h (the shader text as a C array) is made from SMAA.hlsl by tools/release/embed_smaa.py.
