rr: add FSR Ray Regeneration, exact RDNA3 inference and motion experiments

Add an experimental FSR Ray Regeneration backend for D3D12 RR requests:
- Convert depth, motion, normals and albedos into AMD denoiser inputs.
- Split and recompose diffuse/specular signals, then run Super Sampling.
- Add stability/detail controls, demodulation guards and halo limiting.
- Handle AMD provider discovery under NVIDIA GPU spoofing.
- Add runtime probes, synthetic reference scenes and per-dispatch profiling.

Add exact gfx11 DLSS-RR inference using f16 cooperative matrices:
- Reproduce FP8 conversions, accumulation and camera reprojection arithmetic.
- Widen model weights and avoid requiring VK_EXT_shader_float8.
- Extend model building, replay tools and descriptor metadata.

Expand motion preprocessing and experimental AW2 native-motion support:
- Add tiled LDS dilation, padded allocation handling and thin-only sky fill.
- Order dilation with input waits and NGX on the selected stream.
- Add jitter-aligned native composition, hybrid routing and wire history repair.
- Add prepared masks, sparse repair and independent motion/repair controls.

Add optional fused R11G11B10 input/output conversion, sampled stage timings
and profile summarization. Extend configuration, packaging, documentation,
FidelityFX headers and CPU/GPU regression coverage.

scripts/run_rr_backend_check_proton.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Runs build/rr_backend_check.exe through a Proton build in its own prefix, against a portable d4r
+# folder (d4r.ini, d4r_nvngx.dll, nvcuda.dll, ngx/, zluda/, and amd_fidelityfx_denoiser_dx12.dll or
+# nvngx_dlssd.dll for the backend under test), with the d4r vkd3d-proton next to the exe.
+# The GPU is reported as NVIDIA (PROTON_FORCE_NVAPI=1 DXVK_NVAPI_GPU_ARCH=AD100), as d4r's games run.
+# usage: run_rr_backend_check_proton.sh PROTON_DIR VKD3D_DIR D4R_DIR OUT_DIR [check args...]
+# Env: D4R_RR_BACKEND (dlss|fsr) and any other shim variable are passed through.
+#      D4R_RR_CHECK_COMPAT  prefix (default ${TMPDIR:-/tmp}/d4r-rr-check-compat)
+if [[ $# -lt 4 ]]; then
+  printf 'usage: %s PROTON_DIR VKD3D_DIR D4R_DIR OUT_DIR [check args...]\n' "$0" >&2
+  exit 2
+fi
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+PROTON_DIR="$(realpath "$1")"
+VKD3D_DIR="$(realpath "$2")"
+D4R_DIR="$(realpath "$3")"
+OUT="$(realpath -m "$4")"
+shift 4
+winpath() { printf 'Z:%s' "$(printf '%s' "$1" | tr '/' '\\')"; }
+
+[[ -f "$ROOT/build/rr_backend_check.exe" ]] || "$ROOT/scripts/build_rr_backend_check.sh" >/dev/null
+APP="$OUT/app"
+mkdir -p "$APP"
+cp -f "$ROOT/build/rr_backend_check.exe" "$APP/"
+cp -f "$VKD3D_DIR/d3d12.dll" "$VKD3D_DIR/d3d12core.dll" "$APP/"
+{
+  printf 'proton=%s\nd4r=%s\nbackend=%s\n' "$PROTON_DIR" "$D4R_DIR" "${D4R_RR_BACKEND:-ini}"
+  sha256sum "$APP/d3d12.dll" "$APP/d3d12core.dll" "$D4R_DIR"/*.dll
+} > "$OUT/run-manifest.txt"
+export STEAM_COMPAT_CLIENT_INSTALL_PATH="${STEAM_COMPAT_CLIENT_INSTALL_PATH:-$HOME/.local/share/Steam}"
+export STEAM_COMPAT_DATA_PATH="$(realpath -m "${D4R_RR_CHECK_COMPAT:-${TMPDIR:-/tmp}/d4r-rr-check-compat}")"
+mkdir -p "$STEAM_COMPAT_DATA_PATH"
+export WINEDLLOVERRIDES="d3d12,d3d12core=n,b${WINEDLLOVERRIDES:+;$WINEDLLOVERRIDES}"
+export DXIL_SPIRV_CONFIG="${DXIL_SPIRV_CONFIG-wmma_rdna3_workaround}"
+export VKD3D_SHADER_CACHE_PATH="${VKD3D_SHADER_CACHE_PATH:-$(winpath "$OUT")}"
+export PROTON_FORCE_NVAPI=1 DXVK_NVAPI_GPU_ARCH=AD100
+export D4R_SHIM_LOG="$(winpath "$OUT/d4r_nvngx.log")"
+set +e
+"$PROTON_DIR/proton" run "$APP/rr_backend_check.exe" "$(winpath "$D4R_DIR/d4r_nvngx.dll")" "$(winpath "$OUT")" "$@" \
+  > "$OUT/stdout.log" 2> "$OUT/stderr.log"
+status=$?
+set -e
+printf 'exit=%s\n' "$status" >> "$OUT/run-manifest.txt"
+grep -E '^(check=|overall=|tonemapped)' "$OUT/stdout.log" || true
+exit "$status"