#!/bin/sh

# Slackware build script for shader-slang

# Copyright 2026 Jay Lanagan (j@lngn.net), Detroit, MI, USA.
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

cd $(dirname $0) ; CWD=$(pwd)

PRGNAM=shader-slang
SRCNAM=slang
VERSION=${VERSION:-2026.19}
BUILD=${BUILD:-1}
TAG=${TAG:-_lngn}
PKGTYPE=${PKGTYPE:-txz}

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

TMP=${TMP:-/tmp/lngn}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -march=x86-64 -mtune=generic -fPIC"
  LIBDIRSUFFIX="64"
elif [ "$ARCH" = "aarch64" ]; then
  SLKCFLAGS="-O2 -march=armv8-a -mtune=generic -fPIC"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $SRCNAM-$VERSION
tar xvf $CWD/$SRCNAM-$VERSION.tar.?z
cd $SRCNAM-$VERSION
chown -R root:root .
find -L . \
 \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
  -o -perm 511 \) -exec chmod 755 {} \; -o \
 \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;

git clone https://github.com/swiftlang/swift-cmark $TMP/$SRCNAM-$VERSION/external/cmark
git clone --branch v5.4.9 https://github.com/lua/lua.git $TMP/$SRCNAM-$VERSION/external/lua

sed -e "s/find_package(lz4.*/include(FindPkgConfig)\npkg_check_modules(lz4 REQUIRED IMPORTED_TARGET GLOBAL liblz4)/" \
    -e "s/LZ4::lz4/PkgConfig::lz4/g" \
    -e "/find_package/ s/VulkanHeaders/Vulkan/g" \
    -i CMakeLists.txt

sed -e "s/\(find_package(LLVM \)\([^ ]\+\) /\1/" \
    -i cmake/LLVM.cmake

find tools/gfx/vulkan/ \
    \( -name "*.cpp" -or -name "*.h" \) \
    -exec \
      sed -e 's/"spirv-tools\/include\/\(.*\)"/<\1>/g' \
      -i {} \+

# Add include prefix
sed -e 's/${CMAKE_INSTALL_INCLUDEDIR}/&\/'"$PRGNAM"'/g' \
  -i cmake/SlangTarget.cmake

# Disable double header install
perl -0777 -pi -e 's/install\s*\(\s*DIRECTORY\s*"\$\{slang_SOURCE_DIR\}\/include\".*?\)\s*//s' \
  CMakeLists.txt

# https://github.com/shader-slang/slang/pull/8369#issuecomment-3255737218
sed -e 's/#include "\(SPIRV\/.*\)"/#include <glslang\/\1>/g' \
  -i source/slang-glslang/slang-glslang.cpp

# Use system stb and fast float
sed -e 's#${CMAKE_CURRENT_LIST_DIR}/stb#/usr/include/stb#' \
  -e 's#set(_fast_float_include "${CMAKE_CURRENT_LIST_DIR}/fast_float/include")#find_package(FastFloat REQUIRED)#' \
  -e 's#INTERFACE "${_fast_float_include}"#INTERFACE FastFloat::fast_float#' \
  -i external/CMakeLists.txt

# Fix compatibility with unordered_dense 5.x
sed -e 's/detail::wyhash::hash/detail::hash_bytes/' -i source/core/slang-hash.h

mkdir -p build
cd build
CC=clang \
CXX=clang++ \
  cmake \
    -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
    -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DCMAKE_INSTALL_LIBDIR=/usr/lib${LIBDIRSUFFIX} \
    -DCMAKE_INSTALL_FULL_LIBDIR=/usr/lib${LIBDIRSUFFIX} \
    -DCMAKE_BUILD_TYPE='Release' \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON \
    -DSLANG_VERSION_NUMERIC="$VERSION" \
    -DSLANG_VERSION_FULL="v$VERSION" \
    -DSLANG_ENABLE_RELEASE_DEBUG_INFO=FALSE \
    -DSLANG_ENABLE_SPLIT_DEBUG_INFO=FALSE \
    -DSLANG_ENABLE_TESTS=FALSE \
    -DSLANG_ENABLE_SLANG_RHI=FALSE \
    -DSLANG_USE_SYSTEM_MINIZ=TRUE \
    -DSLANG_USE_SYSTEM_LZ4=TRUE \
    -DSLANG_USE_SYSTEM_VULKAN_HEADERS=TRUE \
    -DSLANG_USE_SYSTEM_SPIRV_HEADERS=TRUE \
    -DSLANG_USE_SYSTEM_SPIRV_TOOLS=TRUE \
    -DSLANG_USE_SYSTEM_UNORDERED_DENSE=TRUE \
    -DSLANG_USE_SYSTEM_GLSLANG=TRUE \
    -DSLANG_OVERRIDE_LUA_PATH="$TMP/$SRCNAM-$VERSION/external" \
    -DSLANG_OVERRIDE_CMARK_PATH="$TMP/$SRCNAM-$VERSION/external" \
    -DSLANG_SLANG_LLVM_FLAVOR=DISABLE \
    -DSLANG_ENABLE_SLANG_PROXY=FALSE \
    -DSLANG_ENABLE_GFX=FALSE ..
  make
  make install DESTDIR=$PKG
cd ..
#    -DSLANG_DXC_BUILD_FROM_SOURCE=ON \

# Don't ship .la files:
rm -f $PKG/{,usr/}lib${LIBDIRSUFFIX}/*.la

find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

if [ "$ARCH" = "x86_64" ]; then
mkdir -p $PKG/usr/lib64
cp -R $PKG/usr/lib/* $PKG/usr/lib64
rm -r $PKG/usr/lib
sed 's|/lib|/lib64|' -i $PKG/usr/lib64/pkgconfig/slang-compiler.pc

elif [ "$ARCH" = "aarch64" ]; then
mkdir -p $PKG/usr/lib64
cp -R $PKG/usr/lib/* $PKG/usr/lib64
rm -r $PKG/usr/lib
sed 's|/lib|/lib64|' -i $PKG/usr/lib64/pkgconfig/slang-compiler.pc
fi

if [ -d $PKG/usr/man ]; then
find $PKG/usr/man -type f -exec gzip -9 {} \;
for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done
fi

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
#mv $PKG/usr/share/doc/slang $PKG/usr/doc/$PRGNAM-$VERSION
rm -r $PKG/usr/share
cp -a LICENSE *.md $PKG/usr/doc/$PRGNAM-$VERSION
chmod 644 $PKG/usr/doc/$PRGNAM-$VERSION/*
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc
cat $CWD/slack-required > $PKG/install/slack-required

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE