%global commit 36b80aac50ea401a9adde44d86712c2241b2acfd
%global shortcommit %(c=%{commit}; echo ${c:0:7})
%global commitdate 20210402

Name:           ISPCTexComp
Version:        0
Release:        0.5.%{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
* Mon May 11 2026 Nick Schuetz <nschuetz@redhat.com> - 0-0.5.20210402git36b80aa
- Update to commit 36b80aac50ea401a9adde44d86712c2241b2acfd (2021-04-02)
  to match the engine pin (cmake/3rdParty/Platform/Linux/
  BuiltInPackages_linux_x86_64.cmake on stabilization/26050 pins
  ISPCTexComp-36b80aa-rev1). The previous commit 691513b (2023-08-07)
  was newer chronologically but didn't match what the engine's
  BuiltInPackages references; drift-detection workflow had been
  flagging this as out-of-date since the script's first run.
- Engine consumes ISPCTexComp's libispc_texcomp.so via the
  ImageProcessing Gem's BC1/BC3/BC4/BC5/BC6H/BC7/ASTC/ETC1 block
  compression path. Commit 36b80aa's "bool -> uint8 for dual_plane"
  change is the upstream-pinned API surface the engine expects.

* 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)