#!/bin/bash

# Slackware build script for vulkan-sdk

# Copyright 2016, 2017  Heinz Wiesinger, Amsterdam, The Netherlands
# Copyright 2016, 2017, 2018  Patrick J. Volkerding, Sebeka, MN, 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)

PKGNAM=vulkan-sdk
VERSION=${VERSION:-$(echo Vulkan-LoaderAndValidationLayers-sdk-*.tar.?z | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
BUILD=${BUILD:-1}

NUMJOBS=${NUMJOBS:-" -j$(expr $(nproc) + 1) "}

# Automatically determine the architecture we're building on:
MARCH=$( uname -m )
if [ -z "$ARCH" ]; then
  case "$MARCH" in
    i?86)    export ARCH=i586 ;;
    armv7hl) export ARCH=$MARCH ;;
    arm*)    export ARCH=arm ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
    *)       export ARCH=$MARCH ;;
  esac
fi

# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
# the name of the created package would be, and then exit. This information
# could be useful to other scripts.
if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PKGNAM-$VERSION-$ARCH-$BUILD.txz"
  exit 0
fi

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "s390" ]; then
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
elif [ "$ARCH" = "armv7hl" ]; then
  SLKCFLAGS="-O2 -march=armv7-a -mfpu=vfpv3-d16"
  LIBDIRSUFFIX=""
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

TMP=${TMP:-/tmp}
PKG=$TMP/package-vulkan-sdk

rm -rf $PKG
mkdir -p $TMP $PKG
cd $TMP
rm -rf Vulkan-LoaderAndValidationLayers-sdk-$VERSION
tar xvf $CWD/Vulkan-LoaderAndValidationLayers-sdk-$VERSION.tar.?z || exit 1
cd Vulkan-LoaderAndValidationLayers-sdk-$VERSION || exit 1

GLSLANG_VERSION=$(cat external_revisions/glslang_revision | head -n 1)
SPIRV_HEADERS_VERSION=$(basename SPIRV-Headers-* .tar.?z | rev | cut -d - -f 1 | rev)
SPIRV_TOOLS_VERSION=$(basename SPIRV-Tools-* .tar.?z | rev | cut -d - -f 1 | rev)

mkdir external

cd external
  tar xf $CWD/glslang-${GLSLANG_VERSION}.tar.?z || exit 1
  mv glslang-${GLSLANG_VERSION} glslang

cd glslang/External
tar xf $CWD/SPIRV-Tools-${SPIRV_TOOLS_VERSION}.tar.?z* || exit 1
mv SPIRV-Tools-${SPIRV_TOOLS_VERSION} spirv-tools

mkdir -p spirv-tools/external
cd spirv-tools/external
  tar xvf $CWD/SPIRV-Headers-${SPIRV_HEADERS_VERSION}.tar.?z* || exit 1
  mv SPIRV-Headers-${SPIRV_HEADERS_VERSION} spirv-headers

cd $TMP/Vulkan-LoaderAndValidationLayers-sdk-$VERSION

# chown -R root:root .
find . \
  \( -perm 777 -o -perm 775 -o -perm 711 -o -perm 555 -o -perm 511 \) \
  -exec chmod 755 {} \; -o \
  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
  -exec chmod 644 {} \;

mkdir -p external/{glslang,spirv-tools}/build
mkdir -p build
mkdir -p build-demos

# Fix LIBDIRSUFFIX
for i in $(find external -name CMakeLists.txt); do
  sed -i "s|DESTINATION lib|DESTINATION \${CMAKE_INSTALL_LIBDIR}|" "$i"
done

cd external/glslang/build
  cmake \
    -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
    -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DCMAKE_INSTALL_LIBDIR=lib$LIBDIRSUFFIX \
    -DCMAKE_BUILD_TYPE=Release \
    ..

  make $NUMJOBS VERBOSE=1 || make || exit 1
  make install DESTDIR=$PKG || exit 1

cd -

cd build
  cmake \
    -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
    -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DCMAKE_INSTALL_SYSCONFDIR=/etc \
    -DCMAKE_INSTALL_DATADIR=/share \
    -DCMAKE_SKIP_RPATH=True \
    -DBUILD_TESTS=Off \
    -DBUILD_DEMOS=On \
    -DBUILD_WSI_XLIB_SUPPORT=On \
    -DBUILD_WSI_XCB_SUPPORT=On \
    -DBUILD_WSI_WAYLAND_SUPPORT=Off \
    -DBUILD_WSI_MIR_SUPPORT=Off \
    -DCMAKE_BUILD_TYPE=Release \
    -DGLSLANG_VALIDATOR=../external/glslang/build/StandAlone/glslangValidator \
    ..

  make $NUMJOBS VERBOSE=1 || make || exit 1
  make install DESTDIR=$PKG || exit 1
cd -

mkdir -p $PKG/usr/share/vulkan/{explicit,implicit}_layer.d

mv $PKG/etc/vulkan/explicit_layer.d/*.json $PKG/usr/share/vulkan/explicit_layer.d/
mv $PKG/usr/bin/smoketest $PKG/usr/bin/vulkan-smoketest

# Use headers from spirv-headers as they are newer than the ones installed by glslang
for i in spirv.h spirv.hpp spirv.hpp11; do
  install -m 0644 external/glslang/External/spirv-tools/external/spirv-headers/include/spirv/1.2/$i \
    $PKG/usr/include/SPIRV/
done

## I don't know why this is here, so I'm commenting it out. ;-)
#( cd $PKG/usr/include
#  ln -sf SPIRV spirv
#)

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

mkdir -p $PKG/usr/doc/$PKGNAM-$VERSION
cp -a *.md LICENSE.txt loader/LoaderAndLayerInterface.md \
  $PKG/usr/doc/$PKGNAM-$VERSION

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

cd $PKG
/sbin/makepkg -l y -c n $TMP/$PKGNAM-$VERSION-$ARCH-$BUILD.txz