# Copyright 2006 The QElectroTech Team
# This file is part of QElectroTech.
#
# QElectroTech is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# QElectroTech is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with QElectroTech. If not, see <http://www.gnu.org/licenses/>.

message(" - find_spacemouse")

# QET_ENABLE_SPACEMOUSE (cmake/developer_options.cmake) is off by default,
# so none of this runs, and the default build is entirely unaffected: no new
# dependency, no new source files, no new symbols.
#
# When it is on, the platform decides which backend (if any) is available --
# see sources/spacemouse/spacemousebackend.h for what a backend is. Only one
# exists today: SpnavBackend, Linux, via libspnav. A Windows/macOS backend
# would need 3Dconnexion's proprietary 3DxWare SDK and is not implemented
# (see discussion #599's own phase split); until it is, turning this option
# on there downgrades cleanly with a warning rather than failing configure.
set(QET_SPACEMOUSE_ENABLED FALSE)
set(QET_SPACEMOUSE_BACKEND_SPNAV_ENABLED FALSE)

if(QET_ENABLE_SPACEMOUSE)
    if(UNIX AND NOT APPLE)
        # libspnav is looked for via its pkg-config file (present on every
        # distro package of it this was checked against: Debian/Ubuntu's
        # libspnav-dev ships /usr/share/pkgconfig/spnav.pc). Not found does
        # not hard-fail the whole configure -- it downgrades the option back
        # to off with a clear message, so a developer who doesn't have the
        # library installed still gets a normal build instead of a configure
        # error for an opt-in feature they didn't ask to block on.
        find_package(PkgConfig)
        if(PkgConfig_FOUND)
            pkg_check_modules(SPNAV IMPORTED_TARGET spnav)
        endif()

        if(SPNAV_FOUND)
            set(QET_SPACEMOUSE_ENABLED TRUE)
            set(QET_SPACEMOUSE_BACKEND_SPNAV_ENABLED TRUE)
            add_definitions(-DQET_SPACEMOUSE_SUPPORT)
            add_definitions(-DQET_SPACEMOUSE_BACKEND_SPNAV)
            message("QET_ENABLE_SPACEMOUSE      ON  (backend: libspnav ${SPNAV_VERSION})")
        else()
            message(WARNING "QET_ENABLE_SPACEMOUSE is ON but libspnav was not found via pkg-config "
                             "(install libspnav-dev, or the equivalent for your distribution) -- "
                             "building WITHOUT 3D mouse support.")
        endif()
    else()
        message(WARNING "QET_ENABLE_SPACEMOUSE is ON but no 3D mouse backend is implemented yet "
                         "for this platform (only Linux/libspnav exists today -- see "
                         "https://github.com/qelectrotech/qelectrotech-source-mirror/discussions/599) "
                         "-- building WITHOUT 3D mouse support.")
    endif()
endif()