# Description: A collection of tools, libraries and tests for shader compilation.
# URL: https://github.com/google/shaderc
# Maintainer: Danny Rawlins, crux at romster dot me
# Depends on: glslang
# Optional: asciidoctor

name=shaderc
version=2020.3
release=1
source=(https://github.com/google/$name/archive/v$version/$name-v$version.tar.gz
	glslc.1 spvc.1 glslc-asciidoc.patch spvc-asciidoc.patch
	0001-Drop-third-party-code-in-CMakeLists.txt.patch
	shaderc-2020.3-system-glslang.patch
	0001-Fix-SPIRV-includes-location.patch)

build() {
	patch -d $name-$version/glslc -p0 -i $SRC/glslc-asciidoc.patch
	patch -d $name-$version/spvc -p0 -i $SRC/spvc-asciidoc.patch

	patch -p1 -d $name-$version -i $SRC/0001-Drop-third-party-code-in-CMakeLists.txt.patch
	patch -p1 -d $name-$version -i $SRC/0001-Fix-SPIRV-includes-location.patch
	patch -p1 -d $name-$version -i $SRC/shaderc-2020.3-system-glslang.patch

	# de-vendor libs and disable git versioning
	sed '/examples/d;/third_party/d' -i $name-$version/CMakeLists.txt
	sed '/build-version/d' -i $name-$version/glslc/CMakeLists.txt
	cat <<- EOF > $name-$version/glslc/src/build-version.inc
"${version}\\n"
"$(prt-get info spirv-tools | awk '/^Version:/ {print $2}')\\n"
"$(prt-get info glslang | awk '/^Version:/ {print $2}')\\n"
EOF

	cmake -S $name-$version -B build -G Ninja \
		-D CMAKE_INSTALL_PREFIX=/usr \
		-D CMAKE_INSTALL_LIBDIR=lib \
		-D CMAKE_BUILD_TYPE=Release \
		-D CMAKE_CXX_FLAGS_RELEASE="$CXXFLAGS" \
		-D CMAKE_C_FLAGS_RELEASE="$CFLAGS" \
		-D SHADERC_SKIP_TESTS=ON \
		-Wno-dev

	cmake --build build -j ${JOBS:-1}

	DESTDIR=$PKG cmake --install build

	if [ -e '/usr/bin/asciidoctor' ]; then
		cd ../glslc
		asciidoctor -b manpage README.asciidoc -o glslc.1
		install -D -m 0644 -t $PKG/usr/share/man/man1 glslc.1

		cd ../spvc
		asciidoctor -b manpage README.asciidoc -o spvc.1
		install -D -m 0644 -t $PKG/usr/share/man/man1 spvc.1
	else
		install -D -m 0644 -t $PKG/usr/share/man/man1 $SRC/glslc.1
		install -D -m 0644 -t $PKG/usr/share/man/man1 $SRC/spvc.1
	fi
}