# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#[=======================================================================[.rst:
FindGLUT
--------

Find OpenGL Utility Toolkit (GLUT) library and include files.

IMPORTED Targets
^^^^^^^^^^^^^^^^

.. versionadded:: 3.1

This module defines the :prop_tgt:`IMPORTED` targets:

``GLUT::GLUT``
 Defined if the system has GLUT.

Result Variables
^^^^^^^^^^^^^^^^

This module sets the following variables:

::

  GLUT_INCLUDE_DIR, where to find GL/glut.h, etc.
  GLUT_LIBRARIES, the libraries to link against
  GLUT_FOUND, If false, do not try to use GLUT.

Also defined, but not for general use are:

::

  GLUT_glut_LIBRARY = the full path to the glut library.
  GLUT_Xmu_LIBRARY  = the full path to the Xmu library.
  GLUT_Xi_LIBRARY   = the full path to the Xi Library.

.. versionadded:: 3.13
  Debug and Release variants are found separately.
#]=======================================================================]

include(${CMAKE_CURRENT_LIST_DIR}/SelectLibraryConfigurations.cmake)
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)

function(_add_glut_target_simple)
  if(TARGET GLUT::GLUT)
    return()
  endif()
  add_library(GLUT::GLUT INTERFACE IMPORTED)
  if(GLUT_INCLUDE_DIRS)
    target_include_directories(GLUT::GLUT SYSTEM
      INTERFACE "${GLUT_INCLUDE_DIRS}")
  endif()
  if(GLUT_LIBRARIES)
    target_link_libraries(GLUT::GLUT INTERFACE ${GLUT_LIBRARIES})
  endif()
  if(GLUT_LDFLAGS)
    target_link_options(GLUT::GLUT INTERFACE ${GLUT_LDFLAGS})
  endif()
  if(GLUT_CFLAGS)
    separate_arguments(GLUT_CFLAGS_SPLIT UNIX_COMMAND "${GLUT_CFLAGS}")
    target_compile_options(GLUT::GLUT INTERFACE ${GLUT_CFLAGS_SPLIT})
  endif()

  set_property(TARGET GLUT::GLUT APPEND PROPERTY
    IMPORTED_LOCATION "${GLUT_glut_LIBRARY}")
endfunction()

find_package(PkgConfig)
if(PKG_CONFIG_FOUND)
  pkg_check_modules(GLUT glut)
  if(GLUT_FOUND)
    # In the non-pkg-config code path we only provide GLUT_INCLUDE_DIR.
    set(GLUT_INCLUDE_DIR "${GLUT_INCLUDE_DIRS}")
    _add_glut_target_simple()
    FIND_PACKAGE_HANDLE_STANDARD_ARGS(GLUT REQUIRED_VARS GLUT_FOUND)
    return()
  endif()
endif()

if(WIN32)
  find_path( GLUT_INCLUDE_DIR NAMES GL/glut.h
    PATHS  ${GLUT_ROOT_PATH}/include )
  find_library( GLUT_glut_LIBRARY_RELEASE NAMES glut glut32 freeglut
    PATHS
    ${OPENGL_LIBRARY_DIR}
    ${GLUT_ROOT_PATH}/Release
    )
  find_library( GLUT_glut_LIBRARY_DEBUG NAMES freeglutd
    PATHS
    ${OPENGL_LIBRARY_DIR}
    ${GLUT_ROOT_PATH}/Debug
    )
  mark_as_advanced(GLUT_glut_LIBRARY_RELEASE GLUT_glut_LIBRARY_DEBUG)
  select_library_configurations(GLUT_glut)
elseif(APPLE)
  find_path(GLUT_INCLUDE_DIR glut.h ${OPENGL_LIBRARY_DIR})
  find_library(GLUT_glut_LIBRARY GLUT DOC "GLUT library for OSX")
  find_library(GLUT_cocoa_LIBRARY Cocoa DOC "Cocoa framework for OSX")
  mark_as_advanced(GLUT_glut_LIBRARY GLUT_cocoa_LIBRARY)

  if(GLUT_cocoa_LIBRARY AND NOT TARGET GLUT::Cocoa)
    add_library(GLUT::Cocoa UNKNOWN IMPORTED)
    # Cocoa should always be a Framework, but we check to make sure.
    if(GLUT_cocoa_LIBRARY MATCHES "/([^/]+)\\.framework$")
      set(_glut_cocoa "${GLUT_cocoa_LIBRARY}/${CMAKE_MATCH_1}")
      if(EXISTS "${_glut_cocoa}.tbd")
        string(APPEND _glut_cocoa ".tbd")
      endif()
      set_target_properties(GLUT::Cocoa PROPERTIES
        IMPORTED_LOCATION "${_glut_cocoa}")
    else()
      set_target_properties(GLUT::Cocoa PROPERTIES
        IMPORTED_LOCATION "${GLUT_cocoa_LIBRARY}")
    endif()
  endif()
else()
  if(BEOS)
    set(_GLUT_INC_DIR /boot/develop/headers/os/opengl)
    set(_GLUT_glut_LIB_DIR /boot/develop/lib/x86)
  else()
    find_library( GLUT_Xi_LIBRARY Xi
      /usr/openwin/lib
      )
    mark_as_advanced(GLUT_Xi_LIBRARY)

    find_library( GLUT_Xmu_LIBRARY Xmu
      /usr/openwin/lib
      )
    mark_as_advanced(GLUT_Xmu_LIBRARY)

    if(GLUT_Xi_LIBRARY AND NOT TARGET GLUT::Xi)
      add_library(GLUT::Xi UNKNOWN IMPORTED)
      set_target_properties(GLUT::Xi PROPERTIES
        IMPORTED_LOCATION "${GLUT_Xi_LIBRARY}")
    endif()

    if(GLUT_Xmu_LIBRARY AND NOT TARGET GLUT::Xmu)
      add_library(GLUT::Xmu UNKNOWN IMPORTED)
      set_target_properties(GLUT::Xmu PROPERTIES
        IMPORTED_LOCATION "${GLUT_Xmu_LIBRARY}")
    endif()

  endif ()

  find_path( GLUT_INCLUDE_DIR GL/glut.h
    /usr/include/GL
    /usr/openwin/share/include
    /usr/openwin/include
    /opt/graphics/OpenGL/include
    /opt/graphics/OpenGL/contrib/libglut
    ${_GLUT_INC_DIR}
    )

  find_library( GLUT_glut_LIBRARY glut
    /usr/openwin/lib
    ${_GLUT_glut_LIB_DIR}
    )

  unset(_GLUT_INC_DIR)
  unset(_GLUT_glut_LIB_DIR)
endif()
mark_as_advanced(GLUT_glut_LIBRARY)

FIND_PACKAGE_HANDLE_STANDARD_ARGS(GLUT REQUIRED_VARS GLUT_glut_LIBRARY GLUT_INCLUDE_DIR)

if (GLUT_FOUND)
  # Is -lXi and -lXmu required on all platforms that have it?
  # If not, we need some way to figure out what platform we are on.
  set( GLUT_LIBRARIES
    ${GLUT_glut_LIBRARY}
    )
  foreach(v GLUT_Xmu_LIBRARY GLUT_Xi_LIBRARY GLUT_cocoa_LIBRARY)
    if(${v})
      list(APPEND GLUT_LIBRARIES ${${v}})
    endif()
  endforeach()

  if(NOT TARGET GLUT::GLUT)
    add_library(GLUT::GLUT UNKNOWN IMPORTED)
    set_target_properties(GLUT::GLUT PROPERTIES
      INTERFACE_INCLUDE_DIRECTORIES "${GLUT_INCLUDE_DIR}")
    if(GLUT_glut_LIBRARY MATCHES "/([^/]+)\\.framework$")
      set(_glut_glut "${GLUT_glut_LIBRARY}/${CMAKE_MATCH_1}")
      if(EXISTS "${_glut_glut}.tbd")
        string(APPEND _glut_glut ".tbd")
      endif()
      set_target_properties(GLUT::GLUT PROPERTIES
        IMPORTED_LOCATION "${_glut_glut}")
    else()
      if(GLUT_glut_LIBRARY_RELEASE)
        set_property(TARGET GLUT::GLUT APPEND PROPERTY
          IMPORTED_CONFIGURATIONS RELEASE)
        set_target_properties(GLUT::GLUT PROPERTIES
          IMPORTED_LOCATION_RELEASE "${GLUT_glut_LIBRARY_RELEASE}")
      endif()

      if(GLUT_glut_LIBRARY_DEBUG)
        set_property(TARGET GLUT::GLUT APPEND PROPERTY
          IMPORTED_CONFIGURATIONS DEBUG)
        set_target_properties(GLUT::GLUT PROPERTIES
          IMPORTED_LOCATION_DEBUG "${GLUT_glut_LIBRARY_DEBUG}")
      endif()

      if(NOT GLUT_glut_LIBRARY_RELEASE AND NOT GLUT_glut_LIBRARY_DEBUG)
        set_property(TARGET GLUT::GLUT APPEND PROPERTY
          IMPORTED_LOCATION "${GLUT_glut_LIBRARY}")
      endif()
    endif()

    if(TARGET GLUT::Xmu)
      set_property(TARGET GLUT::GLUT APPEND
        PROPERTY INTERFACE_LINK_LIBRARIES GLUT::Xmu)
    endif()

    if(TARGET GLUT::Xi)
      set_property(TARGET GLUT::GLUT APPEND
        PROPERTY INTERFACE_LINK_LIBRARIES GLUT::Xi)
    endif()

    if(TARGET GLUT::Cocoa)
      set_property(TARGET GLUT::GLUT APPEND
        PROPERTY INTERFACE_LINK_LIBRARIES GLUT::Cocoa)
    endif()
  endif()

  #The following deprecated settings are for backwards compatibility with CMake1.4
  set (GLUT_LIBRARY ${GLUT_LIBRARIES})
  set (GLUT_INCLUDE_PATH ${GLUT_INCLUDE_DIR})
endif()

mark_as_advanced(GLUT_INCLUDE_DIR)
