%global gitbranch       main
# Full 40-char SHA — GitHub honors `git fetch <sha>` only for full hashes
# (uploadpack.allowAnySHA1InWant); the CI keeps this in sync with upstream HEAD.
%global gitcommit       2fd322ecf78caf66a07d50fa1d022ee82ca69910
%global gitcommit_short %(echo %{gitcommit} | cut -c1-7)

# Cemu installs as a single, already-stripped binary; skip the auto -debuginfo.
%global debug_package %{nil}

Name:           cemu
Version:        0^g%{gitcommit_short}
Release:        1%{?dist}
Summary:        Wii U emulator

License:        MPL-2.0
URL:            https://github.com/cemu-project/Cemu
# Sources are fetched in %%prep via `git clone`; COPR project l4s has
# enable_net=true so this works inside mock as well.

ExclusiveArch:  aarch64

# Toolchain + general build glue
BuildRequires:  cmake >= 3.20
BuildRequires:  ninja-build
BuildRequires:  clang
BuildRequires:  llvm
BuildRequires:  lld
BuildRequires:  gcc-c++
BuildRequires:  git
BuildRequires:  python3
BuildRequires:  perl-core
BuildRequires:  nasm
BuildRequires:  pkgconfig
BuildRequires:  libtool
BuildRequires:  autoconf
BuildRequires:  automake
BuildRequires:  make
BuildRequires:  patch
BuildRequires:  zip
BuildRequires:  unzip
BuildRequires:  tar
BuildRequires:  xz
BuildRequires:  curl
BuildRequires:  ca-certificates

# System libraries Cemu / vcpkg-built deps link against
BuildRequires:  bluez-libs-devel
BuildRequires:  cubeb-devel
BuildRequires:  freeglut-devel
BuildRequires:  glm-devel
BuildRequires:  gtk3-devel
BuildRequires:  kernel-headers
BuildRequires:  libgcrypt-devel
BuildRequires:  libsecret-devel
BuildRequires:  libusb1-devel
BuildRequires:  systemd-devel
BuildRequires:  wayland-devel
BuildRequires:  wayland-protocols-devel
BuildRequires:  zlib-devel
BuildRequires:  zlib-static
BuildRequires:  bzip2-devel
# libpng-devel ships a cmake config that references PNG::png_static →
# /usr/lib64/libpng16.a; without -static that target is "imported but
# missing" and find_package(PNG) aborts when vcpkg's pkg pulls it in.
BuildRequires:  libpng-static

# Window system / graphics
BuildRequires:  mesa-libGL-devel
BuildRequires:  mesa-libGLU-devel
BuildRequires:  libX11-devel
BuildRequires:  libxcb-devel
BuildRequires:  libxkbcommon-devel

# Audio backends Cubeb may probe
BuildRequires:  alsa-lib-devel
BuildRequires:  pulseaudio-libs-devel

%description
Cemu is a Wii U emulator that runs Wii U games and applications, originally
developed for Windows and now also building on Linux and macOS.

%prep
rm -rf %{name}-%{version}
git clone --depth=1 --branch %{gitbranch} %{url} %{name}-%{version}
cd %{name}-%{version}
git fetch --depth=1 origin %{gitcommit}
git checkout %{gitcommit}

# Skip submodules we never compile on aarch64 Linux. The .update=none entries
# are honored by `git submodule update --init` below.
#   * metal-cpp: macOS Metal backend
git config submodule.dependencies/metal-cpp.update none

# Pre-fetch submodules with per-submodule retries. Cemu's vcpkg submodule is
# `shallow = false` in .gitmodules, but the in-tree CMakeLists auto-unshallows
# vcpkg at configure time if needed, so a depth=1 fetch here is sufficient.
# Read paths from .gitmodules directly — `git submodule foreach` only iterates
# already-checked-out submodules, which doesn't help us on a fresh clone.
git submodule init
git submodule sync
submodules=$(git config --file .gitmodules --get-regexp 'submodule\..*\.path' | awk '{print $2}')
for sm in $submodules; do
  if [ "$(git config --get "submodule.${sm}.update" 2>/dev/null || true)" = "none" ]; then
    echo "skip ${sm} (update=none)"
    continue
  fi
  ok=
  for attempt in 1 2 3 4 5 6 7 8; do
    rm -rf -- "${sm}" ".git/modules/${sm}"
    git submodule init -- "${sm}" >/dev/null
    if git submodule update --depth=1 -- "${sm}"; then
      ok=1
      break
    fi
    echo "${sm}: attempt ${attempt} failed, retrying in $((attempt * 5))s..." >&2
    sleep $((attempt * 5))
  done
  if [ -z "$ok" ]; then
    echo "submodule ${sm}: exhausted retries" >&2
    exit 1
  fi
done

# Some top-level submodules (e.g. dependencies/cubeb) have their own nested
# submodules (sanitizers-cmake). Recurse one extra level — by now all the
# top-level ones are populated and only the nested ones are missing, so this
# does very little work in practice but plugs the find_package() holes that
# cmake hits otherwise.
for attempt in 1 2 3 4 5; do
  if git submodule update --init --recursive --depth=1; then
    break
  fi
  echo "nested submodule fetch attempt ${attempt} failed, retrying in $((attempt * 5))s..." >&2
  sleep $((attempt * 5))
done

%build
cd %{name}-%{version}
export CC=clang
export CXX=clang++
# Reset distro hardening flags — vcpkg builds many vendored libraries that
# trip over -fstack-protector-strong / -D_FORTIFY_SOURCE.
export CFLAGS=
export CXXFLAGS=
export LDFLAGS=
# vcpkg downloads/builds many dependencies during cmake configure; let it use
# the build chroot's tmp. The directory must exist beforehand or vcpkg's
# bootstrap aborts with "not a directory".
export VCPKG_DOWNLOADS=%{_builddir}/vcpkg-downloads
mkdir -p "$VCPKG_DOWNLOADS"
# On aarch64 vcpkg doesn't always ship a prebuilt cmake/ninja and its bootstrap
# can't reliably download them in a sandboxed mock chroot — use the system tools.
export VCPKG_FORCE_SYSTEM_BINARIES=1

cmake -S . -B build -G Ninja \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_C_COMPILER=clang \
    -DCMAKE_CXX_COMPILER=clang++ \
    -DCMAKE_MAKE_PROGRAM=/usr/bin/ninja \
    -DENABLE_VCPKG=ON

cmake --build build -j%{?_smp_build_ncpus}%{!?_smp_build_ncpus:1}

%install
cd %{name}-%{version}

install -Dpm0755 bin/Cemu_release %{buildroot}%{_bindir}/Cemu
install -Dpm0644 dist/linux/info.cemu.Cemu.desktop \
    %{buildroot}%{_datadir}/applications/info.cemu.Cemu.desktop
install -Dpm0644 dist/linux/info.cemu.Cemu.png \
    %{buildroot}%{_datadir}/icons/hicolor/256x256/apps/info.cemu.Cemu.png
install -Dpm0644 dist/linux/info.cemu.Cemu.metainfo.xml \
    %{buildroot}%{_datadir}/metainfo/info.cemu.Cemu.metainfo.xml

# Cemu's runtime data (gameProfiles, resources, shaders) lives next to the
# binary in upstream; ship it under %{_datadir}/Cemu and have the wrapper
# binary find it via a relative path.
mkdir -p %{buildroot}%{_datadir}/Cemu
cp -r bin/gameProfiles %{buildroot}%{_datadir}/Cemu/
cp -r bin/resources %{buildroot}%{_datadir}/Cemu/

%files
%license %{name}-%{version}/LICENSE.txt
%doc %{name}-%{version}/README.md
%{_bindir}/Cemu
%{_datadir}/applications/info.cemu.Cemu.desktop
%{_datadir}/icons/hicolor/256x256/apps/info.cemu.Cemu.png
%{_datadir}/metainfo/info.cemu.Cemu.metainfo.xml
%{_datadir}/Cemu/

%changelog
%autochangelog