# - try to find glut library and include files
#  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.
#  Input: 
#   GLUT_ROOT

IF (WIN32)
  FIND_PATH( GLUT_INCLUDE_DIR NAMES GL/glut.h 
    PATHS  ${GLUT_ROOT}/include ${GLUT_ROOT})
  FIND_LIBRARY( GLUT_glut_LIBRARY NAMES glut glut32
    PATHS
    ${OPENGL_LIBRARY_DIR}
    ${GLUT_ROOT} ${GLUT_ROOT}/lib ${GLUT_ROOT}/rel ${GLUT_ROOT}/debug
    )
ELSE (WIN32)
  
  IF (APPLE)
    # These values for Apple could probably do with improvement.
    FIND_PATH( GLUT_INCLUDE_DIR glut.h
      /System/Library/Frameworks/GLUT.framework/Versions/A/Headers
      ${OPENGL_LIBRARY_DIR}
      )
    SET(GLUT_glut_LIBRARY "-framework GLUT" CACHE STRING "GLUT library for OSX") 
    SET(GLUT_cocoa_LIBRARY "-framework Cocoa" CACHE STRING "Cocoa framework for OSX")
  ELSE (APPLE)
    
    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
      )
  
    FIND_LIBRARY( GLUT_glut_LIBRARY glut
      /usr/openwin/lib
      )
    
    FIND_LIBRARY( GLUT_Xi_LIBRARY Xi
      /usr/openwin/lib
      )
    
    FIND_LIBRARY( GLUT_Xmu_LIBRARY Xmu
      /usr/openwin/lib
      )
    
  ENDIF (APPLE)
  
ENDIF (WIN32)

SET( GLUT_FOUND "NO" )
IF(GLUT_INCLUDE_DIR)
  IF(GLUT_glut_LIBRARY)
    # 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}
      ${GLUT_Xmu_LIBRARY}
      ${GLUT_Xi_LIBRARY} 
      ${GLUT_cocoa_LIBRARY}
      )
    SET( GLUT_FOUND "YES" )
    
    #The following deprecated settings are for backwards compatibility with CMake1.4
    SET (GLUT_LIBRARY ${GLUT_LIBRARIES})
    SET (GLUT_INCLUDE_PATH ${GLUT_INCLUDE_DIR})
    
  ENDIF(GLUT_glut_LIBRARY)
ENDIF(GLUT_INCLUDE_DIR)

MARK_AS_ADVANCED(
  GLUT_INCLUDE_DIR
  GLUT_glut_LIBRARY
  GLUT_Xmu_LIBRARY
  GLUT_Xi_LIBRARY
  )