# Description: 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=2019.0
commit=34c412f21f945f4ef6ed4453f8b5dc4bb9d739e4
release=3
source=(
	https://github.com/google/shaderc/archive/$commit.tar.gz#/$name-$commit.tar.gz
	#https://github.com/google/$name/archive/v$version/$name-v$version.tar.gz
	glslc.1 spvc.1 glslc-asciidoc.patch spvc-asciidoc.patch
	fix-glslang-link-order.patch
	0001-Drop-third-party-code-in-CMakeLists.txt.patch
	shaderc-2019.0-fix-build-against-new-glslang.patch)

build() {
	cd $name-$commit
	#cd $name-$version

	patch -d glslc -p0 -i $SRC/glslc-asciidoc.patch
	patch -d spvc -p0 -i $SRC/spvc-asciidoc.patch

	patch -p1 -i $SRC/fix-glslang-link-order.patch
	patch -p1 -i $SRC/0001-Drop-third-party-code-in-CMakeLists.txt.patch
	patch -p1 -i $SRC/shaderc-2019.0-fix-build-against-new-glslang.patch

	# de-vendor libs and disable git versioning
	sed '/examples/d;/third_party/d' -i CMakeLists.txt
	sed '/build-version/d' -i glslc/CMakeLists.txt
	cat <<- EOF > 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

	mkdir build
	cd build

	cmake .. \
		-DCMAKE_BUILD_TYPE=Release \
		-DCMAKE_INSTALL_PREFIX=/usr \
		-DCMAKE_INSTALL_LIBDIR=lib \
		-DSHADERC_SKIP_TESTS=ON \
		-GNinja \
		-DSHADERC_ENABLE_NV_EXTENSIONS=OFF # Currently requires glslang-git

	ninja -j ${JOBS:-1}

	DESTDIR=$PKG ninja install

	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
}