%global commit 691513b4fb406eccfc2f7d7f8213c8505ff5b897
%global shortcommit %(c=%{commit}; echo ${c:0:7})
%global commitdate 20230807

Name:           ISPCTexComp
Version:        0
Release:        0.4.%{commitdate}git%{shortcommit}%{?dist}
Summary:        ISPC Texture Compressor - SIMD-optimized texture block compression

License:        MIT
URL:            https://github.com/GameTechDev/ISPCTextureCompressor
Source0:        %{url}/archive/%{commit}/ISPCTextureCompressor-%{shortcommit}.tar.gz

# Only x86_64 and aarch64 are supported (ISPC SIMD targets)
ExclusiveArch:  x86_64 aarch64

BuildRequires:  gcc-c++
BuildRequires:  ispc
BuildRequires:  make

%description
ISPC Texture Compressor is a set of CPU SIMD-optimized texture block compression
algorithms from Intel. It supports BC6H, BC7, ASTC, ETC1, BC1, BC3, BC4, and
BC5 compression formats. The compressor uses the Intel ISPC compiler to generate
optimized SIMD code for SSE2, AVX, and NEON instruction sets.

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

%description    devel
Header files for developing applications that use the ISPC Texture Compressor
library.

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

# Fix the ISPC path to use the system ispc compiler instead of bundled binary
sed -i 's|ISPC/linux/ispc|ispc|g' Makefile.linux

# Ensure -shared is in the linker flags for the shared library build.
# Fedora's hardened LDFLAGS inject startup files (Scrt1.o) which cause
# "undefined reference to 'main'" errors when building shared libraries
# without the -shared flag. Force -shared and -nostartfiles into the link line.
sed -i 's/$(CXX) $(LDFLAGS)/$(CXX) -shared -nostartfiles $(LDFLAGS)/' Makefile.linux

# Add -fPIC to ISPC and C++ compilation so object files are suitable for
# shared library linking with Fedora's hardened toolchain.
sed -i 's/$(ISPC)/$(ISPC) --pic/' Makefile.linux
sed -i 's/$(CXX) $(CXXFLAGS)/$(CXX) -fPIC $(CXXFLAGS)/' Makefile.linux

%build
%ifarch x86_64
%make_build -f Makefile.linux ISPC_ARCH=x86-64 ISPC_TARGET="sse2,sse4,avx"
%endif
%ifarch aarch64
%make_build -f Makefile.linux ISPC_ARCH=aarch64 ISPC_TARGET="neon"
%endif

%install
# Install shared library
install -d %{buildroot}%{_libdir}
install -p -m 0755 build/libispc_texcomp.so %{buildroot}%{_libdir}/libispc_texcomp.so.0.0.0
ln -s libispc_texcomp.so.0.0.0 %{buildroot}%{_libdir}/libispc_texcomp.so.0
ln -s libispc_texcomp.so.0 %{buildroot}%{_libdir}/libispc_texcomp.so

# Install header file
install -d %{buildroot}%{_includedir}/%{name}
install -p -m 0644 ispc_texcomp/ispc_texcomp.h %{buildroot}%{_includedir}/%{name}/ispc_texcomp.h

%files
%license license.txt
%{_libdir}/libispc_texcomp.so.0
%{_libdir}/libispc_texcomp.so.0.0.0

%files devel
%{_includedir}/%{name}/
%{_libdir}/libispc_texcomp.so

%changelog
* Wed Feb 11 2026 O3DE Package Maintainers <noreply@o3de.org> - 0-0.4.20230807git691513b
- Add --pic to ISPC and -fPIC to CXX flags for PIC-compliant shared library
- Fix R_X86_64_PC32 relocation error with Fedora hardened linker

* Wed Feb 11 2026 O3DE Package Maintainers <noreply@o3de.org> - 0-0.3.20230807git691513b
- Fix shared library linking: add -shared -nostartfiles to linker flags
- Fedora hardened LDFLAGS inject Scrt1.o causing undefined reference to main

* Tue Feb 11 2025 O3DE Package Maintainers <noreply@o3de.org> - 0-0.1.20230807git691513b
- Initial package based on commit 691513b
- SIMD-optimized texture compression library (BC6H, BC7, ASTC, ETC1, BC1-BC5)