AMD FidelityFX Super Resolution 1 (FSR 1) shader headers, vendored unmodified.

  ffx_a.h      [A] SHADER PORTABILITY 1.20210629
  ffx_fsr1.h   AMD FidelityFX SUPER RESOLUTION [FSR 1] SPATIAL SCALING & EXTRAS v1.20210629
  LICENSE.txt  the repository's license.txt (MIT, "Copyright (c) 2021 Advanced Micro Devices, Inc. All rights reserved.")

Source: https://github.com/GPUOpen-Effects/FidelityFX-FSR at commit a21ffb8f6c13233ba336352bdff293894c706575 (2021-11-15),
directory ffx-fsr/. Both headers carry the same MIT permission notice in their own headers; ffx_a.h also carries an MIT
notice "Copyright (c) 2014 Michal Drobot" (for the concepts used in its FLOAT APPROXIMATIONS).

Never edit the two headers. rsx_upscale_fsr1.c includes them for the CPU constant setup (FsrEasuCon, FsrRcasCon) and
fsr1_embed.h (generated from them by tools/smoke/fsr1_embed.py, checked by tools/smoke/test_upscale.sh) carries their text
for the D3D12 shader compile.
