# NvCloth uses a specific commit with PR #58 merged (Lumberyard/O3DE compatibility patches)
%global commit 8e100cca5888d09f40f4721cc433f284b1841e65
%global shortcommit %(c=%{commit}; echo ${c:0:7})
%global snapdate 20200306

%global somajor 0

Name:           NvCloth
Version:        1.1.6
Release:        2.%{snapdate}git%{shortcommit}%{?dist}
Summary:        NVIDIA Cloth simulation library for real-time interactive applications

# Nvidia Source Code License (1-Way Commercial) - not on the SPDX license list
License:        LicenseRef-Fedora-NvidiaSCL-1Way-Commercial
URL:            https://github.com/NVIDIAGameWorks/NvCloth
Source0:        %{url}/archive/%{commit}/NvCloth-%{shortcommit}.tar.gz

# Only x86_64 and aarch64 are relevant targets
ExclusiveArch:  x86_64 aarch64

BuildRequires:  cmake >= 3.3
BuildRequires:  gcc-c++
BuildRequires:  ninja-build

%description
NvCloth is a library that provides low-level access to a cloth solver designed
for real-time interactive applications. It provides the ability to create cloth
simulations with customizable constraints and collision handling. NvCloth is
used by O3DE (Open 3D Engine) through the NVIDIA Cloth Gem.

%package        devel
Summary:        Development files for %{name}
Requires:       %{name}%{?_isa} = %{version}-%{release}

%description    devel
Header files and development libraries for developing applications that use
NvCloth cloth simulation.

%package        static
Summary:        Static library for %{name}
Requires:       %{name}-devel%{?_isa} = %{version}-%{release}

%description    static
Static library for developing applications that use NvCloth cloth simulation.

%prep
%autosetup -n NvCloth-%{commit}

# The CMake build for Linux lives under NvCloth/compiler/cmake/linux
# and expects GW_DEPS_ROOT to point to the repo root
# Patch CMakeLists.txt to use system compiler flags and support shared builds

# Remove hardcoded clang requirement - use system default compiler
sed -i 's/-std=c++11/-std=c++14/g' NvCloth/compiler/cmake/linux/CMakeLists.txt

# Ensure position-independent code for shared library
sed -i '/POSITION_INDEPENDENT_CODE/d' NvCloth/compiler/cmake/linux/NvCloth.cmake
sed -i '/add_library.*NvCloth/a\\tset_target_properties(NvCloth PROPERTIES POSITION_INDEPENDENT_CODE TRUE)' \
    NvCloth/compiler/cmake/linux/NvCloth.cmake 2>/dev/null || true

%build
export GW_DEPS_ROOT=%{_builddir}/NvCloth-%{commit}

# Build shared library
%cmake -S NvCloth/compiler/cmake/linux \
    -G Ninja \
    -DTARGET_BUILD_PLATFORM=linux \
    -DNV_CLOTH_ENABLE_CUDA=0 \
    -DPX_GENERATE_GPU_PROJECTS=0 \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
    -DPX_OUTPUT_LIB_DIR=%{_builddir}/lib \
    -DPX_OUTPUT_DLL_DIR=%{_builddir}/lib
%cmake_build

# Build static library separately
%cmake -S NvCloth/compiler/cmake/linux \
    -G Ninja \
    -B %{_builddir}/NvCloth-%{commit}/%{__cmake_builddir}-static \
    -DTARGET_BUILD_PLATFORM=linux \
    -DNV_CLOTH_ENABLE_CUDA=0 \
    -DPX_GENERATE_GPU_PROJECTS=0 \
    -DPX_STATIC_LIBRARIES=1 \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
    -DPX_OUTPUT_LIB_DIR=%{_builddir}/lib-static \
    -DPX_OUTPUT_DLL_DIR=%{_builddir}/lib-static
cmake --build %{_builddir}/NvCloth-%{commit}/%{__cmake_builddir}-static %{?_smp_mflags}

%install
# Install shared library
install -d %{buildroot}%{_libdir}

# Find the built shared library
SHARED_LIB=$(find %{__cmake_builddir} -name 'libNvCloth*.so*' -type f | head -1)
if [ -z "$SHARED_LIB" ]; then
    # Check alternate output locations
    SHARED_LIB=$(find %{_builddir} -name 'libNvCloth*.so*' -path '*/lib/*' -type f | head -1)
fi

if [ -n "$SHARED_LIB" ]; then
    install -p -m 0755 "$SHARED_LIB" %{buildroot}%{_libdir}/libNvCloth.so.%{somajor}.0.0
    ln -s libNvCloth.so.%{somajor}.0.0 %{buildroot}%{_libdir}/libNvCloth.so.%{somajor}
    ln -s libNvCloth.so.%{somajor} %{buildroot}%{_libdir}/libNvCloth.so
else
    echo "ERROR: Shared library not found"
    find %{_builddir} -name '*NvCloth*' -type f
    exit 1
fi

# Install static library
STATIC_LIB=$(find %{__cmake_builddir}-static -name 'libNvCloth*.a' -type f | head -1)
if [ -z "$STATIC_LIB" ]; then
    STATIC_LIB=$(find %{_builddir} -name 'libNvCloth*.a' -path '*/lib-static/*' -type f | head -1)
fi

if [ -n "$STATIC_LIB" ]; then
    install -p -m 0644 "$STATIC_LIB" %{buildroot}%{_libdir}/libNvCloth.a
fi

# Install NvCloth headers
install -d %{buildroot}%{_includedir}/NvCloth
cp -a NvCloth/include/NvCloth/*.h %{buildroot}%{_includedir}/NvCloth/
if [ -d NvCloth/include/NvCloth/ps ]; then
    cp -a NvCloth/include/NvCloth/ps %{buildroot}%{_includedir}/NvCloth/
fi

# Install PxShared foundation headers (needed by NvCloth API)
install -d %{buildroot}%{_includedir}/foundation
cp -a PxShared/include/foundation/*.h %{buildroot}%{_includedir}/foundation/

%files
%license NvCloth/license.txt PxShared/license.txt
%{_libdir}/libNvCloth.so.%{somajor}
%{_libdir}/libNvCloth.so.%{somajor}.*

%files devel
%{_includedir}/NvCloth/
%{_includedir}/foundation/
%{_libdir}/libNvCloth.so

%files static
%{_libdir}/libNvCloth.a

%changelog
* Tue Feb 11 2025 O3DE Package Maintainers <noreply@o3de.org> - 1.1.6-1.20200306git8e100cc
- Initial package of NvCloth cloth simulation library
- Built from commit 8e100cc (PR #58 merged, O3DE compatibility patches)
- Includes PxShared foundation headers