# Copyright 1999-2019 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=6
GNOME2_EAUTORECONF="yes"
inherit gnome2 virtualx

DESCRIPTION="GNOME 3 compositing window manager based on Clutter"
HOMEPAGE="https://gitlab.gnome.org/GNOME/mutter/"
SRC_URI+=" https://dev.gentoo.org/~leio/distfiles/${PF}-patchset.tar.xz"

LICENSE="GPL-2+"
SLOT="0/3" # 0/libmutter_api_version - ONLY gnome-shell (or anything using mutter-clutter-<api_version>.pc) should use the subslot

IUSE="debug elogind gles2 input_devices_wacom +introspection screencast systemd test udev wayland"
RESTRICT="!test? ( test )"
# native backend requires gles3 for hybrid graphics blitting support and a logind provider
REQUIRED_USE="
	wayland? ( ^^ ( elogind systemd ) )"

KEYWORDS="~alpha amd64 ~arm ~arm64 ~ia64 ~ppc ~ppc64 ~sparc x86"

# libXi-1.7.4 or newer needed per:
# https://bugzilla.gnome.org/show_bug.cgi?id=738944
# gl.pc package is required, which is only installed by mesa if glx is enabled; pre-emptively requiring USE=X on mesa, as hopefully eventually it'll support disabling glx for wayland-only systems
RDEPEND="
	>=dev-libs/atk-2.5.3
	>=x11-libs/gdk-pixbuf-2:2
	>=dev-libs/json-glib-0.12.0
	>=x11-libs/pango-1.30[introspection?]
	>=x11-libs/cairo-1.14[X]
	>=x11-libs/gtk+-3.19.8:3[X,introspection?]
	>=dev-libs/glib-2.53.2:2
	>=media-libs/libcanberra-0.26[gtk3]
	>=x11-libs/startup-notification-0.7
	>=x11-libs/libXcomposite-0.2
	>=gnome-base/gsettings-desktop-schemas-3.21.4[introspection?]
	<gnome-base/gsettings-desktop-schemas-3.31
	gnome-base/gnome-desktop:3=

	x11-libs/libICE
	x11-libs/libSM
	x11-libs/libX11
	>=x11-libs/libXcomposite-0.4
	x11-libs/libXcursor
	x11-libs/libXdamage
	x11-libs/libXext
	>=x11-libs/libXfixes-3
	>=x11-libs/libXi-1.7.4
	x11-libs/libXinerama
	>=x11-libs/libXrandr-1.5
	x11-libs/libXrender
	x11-libs/libxcb
	x11-libs/libxkbfile
	>=x11-libs/libxkbcommon-0.4.3[X]
	x11-misc/xkeyboard-config

	gnome-extra/zenity
	media-libs/mesa[X(+),egl,gles2?]

	input_devices_wacom? ( >=dev-libs/libwacom-0.13 )
	introspection? ( >=dev-libs/gobject-introspection-1.42:= )
	udev? ( >=dev-libs/libgudev-232:= )
	screencast? ( >=media-video/pipewire-0.2.2:0/0.2 )
	wayland? (
		>=dev-libs/libgudev-232:=
		>=dev-libs/libinput-1.4
		>=dev-libs/wayland-1.13.0
		>=dev-libs/wayland-protocols-1.16
		>=media-libs/mesa-10.3[egl,gbm,wayland,gles2]
		systemd? ( sys-apps/systemd )
		elogind? ( sys-auth/elogind )
		>=virtual/libudev-136:=
		x11-base/xorg-server[wayland]
		x11-libs/libdrm:=
	)
"
DEPEND="${RDEPEND}
	dev-util/glib-utils
	>=sys-devel/gettext-0.19.6
	virtual/pkgconfig
	x11-base/xorg-proto
	test? ( app-text/docbook-xml-dtd:4.5 )
	wayland? ( >=sys-kernel/linux-headers-4.4 )
"

PATCHES=(
	# Some patches from gnome-3-30 branch on top of 3.30.2
	"${WORKDIR}"/patches/
	# Hack to not fail USE="-wayland,-gles2" builds with no mesa[gles2]
	"${FILESDIR}"/3.28.3-no-gles2-fix.patch # requires eautoreconf

	"${FILESDIR}"/3.30-eglmesaext-include.patch
)

src_prepare() {
	# Disable building of noinst_PROGRAM for tests
	if ! use test; then
		sed -e '/^noinst_PROGRAMS/d' \
			-i cogl/tests/conform/Makefile.{am,in} || die
		sed -e '/noinst_PROGRAMS += testboxes/d' \
			-i src/Makefile-tests.am || die
		sed -e '/noinst_PROGRAMS/ s/testboxes$(EXEEXT)//' \
			-i src/Makefile.in || die
	fi

	gnome2_src_prepare

	# Leave the damn CFLAGS alone
	sed -e 's/$CFLAGS -g/$CFLAGS /' \
		-i clutter/configure || die
	sed -e 's/$CFLAGS -g -O0/$CFLAGS /' \
		-i cogl/configure || die
	sed -e 's/$CFLAGS -g -O/$CFLAGS /' \
		-i configure || die
}

src_configure() {
	# TODO: pipewire remote desktop support
	# TODO: nvidia EGLDevice support
	# TODO: elogind vs systemd is automagic in 3.28.3 - if elogind is found, it's used instead of systemd; but not a huge problem as elogind package blocks systemd package
	# TODO: lack of --with-xwayland-grab-default-access-rules relies on default settings, but in Gentoo we might have some more packages we want to give Xgrab access (mostly virtual managers and remote desktops)
	# Prefer gl driver by default
	# GLX is forced by mutter but optional in clutter
	# xlib-egl-platform required by mutter x11 backend
	# native backend without wayland is useless
	gnome2_src_configure \
		--disable-static \
		--enable-compile-warnings=minimum \
		--enable-gl \
		--enable-glx \
		--enable-sm \
		--enable-startup-notification \
		--enable-verbose-mode \
		--enable-xlib-egl-platform \
		--with-default-driver=gl \
		--with-libcanberra \
		$(usex debug --enable-debug=yes "") \
		$(use_enable gles2)        \
		$(use_enable gles2 cogl-gles2) \
		$(use_enable introspection) \
		$(use_enable screencast remote-desktop) \
		$(use_enable wayland) \
		$(use_enable wayland kms-egl-platform) \
		$(use_enable wayland native-backend) \
		$(use_enable wayland wayland-egl-server) \
		$(use_with input_devices_wacom libwacom) \
		$(use_with udev gudev)
}

src_test() {
	virtx emake check
}