#
# "$Id$"
#
# Main CMakeLists.txt to build the FLTK project using CMake (www.cmake.org)
# Written by Michael Surette
#
# Copyright 1998-2016 by Bill Spitzak and others.
#
# This library is free software. Distribution and use rights are outlined in
# the file "COPYING" which should have been included with this file.  If this
# file is missing or damaged, see the license at:
#
#     http://www.fltk.org/COPYING.php
#
# Please report all bugs and problems on the following page:
#
#     http://www.fltk.org/str.php
#

#######################################################################
# options
#######################################################################
set(OPTION_OPTIM ""
   CACHE STRING
   "custom optimization flags"
   )
add_definitions(${OPTION_OPTIM})

#######################################################################
set(OPTION_ARCHFLAGS ""
   CACHE STRING
   "custom architecture flags"
   )
add_definitions(${OPTION_ARCHFLAGS})

#######################################################################
set(OPTION_ABI_VERSION ""
   CACHE STRING
   "FLTK ABI Version FL_ABI_VERSION: 1xxyy for 1.x.y (xx,yy with leading zero)"
   )
set(FL_ABI_VERSION ${OPTION_ABI_VERSION})

#######################################################################
#######################################################################
if(UNIX)
   option(OPTION_CREATE_LINKS "create backwards compatibility links" OFF)
   list(APPEND FLTK_LDLIBS -lm)
endif(UNIX)

#######################################################################
if(APPLE)
   option(OPTION_APPLE_X11 "use X11" OFF)
   option(OPTION_APPLE_SDL "use SDL" OFF)
endif(APPLE)

if((NOT APPLE OR OPTION_APPLE_X11) AND NOT WIN32)
   include(FindX11)
   if(X11_FOUND)
      set(USE_X11 1)
      list(APPEND FLTK_LDLIBS -lX11)
      if (X11_Xext_FOUND)
	  list(APPEND FLTK_LDLIBS -lXext)
      endif(X11_Xext_FOUND)
   endif(X11_FOUND)
endif((NOT APPLE OR OPTION_APPLE_X11) AND NOT WIN32)

if (OPTION_APPLE_X11)
  include_directories(AFTER SYSTEM /opt/X11/include/freetype2)
endif (OPTION_APPLE_X11)

if (OPTION_APPLE_SDL)
   find_package(SDL2 REQUIRED)
   if (SDL2_FOUND)
      set(USE_SDL 1)
      set(FL_PORTING 1)
      list(APPEND FLTK_LDLIBS SDL2_LIBRARY)
   endif(SDL2_FOUND)
endif(OPTION_APPLE_SDL)

#######################################################################
option(OPTION_USE_POLL "use poll if available" OFF)
mark_as_advanced(OPTION_USE_POLL)

if(OPTION_USE_POLL)
   CHECK_FUNCTION_EXISTS(poll USE_POLL)
endif(OPTION_USE_POLL)

#######################################################################
option(OPTION_BUILD_SHARED_LIBS
    "Build shared libraries(in addition to static libraries)"
    OFF
    )

#######################################################################
option(OPTION_BUILD_EXAMPLES "build example programs" ON)
option(OPTION_PRINT_SUPPORT "allow print support" ON)
option(OPTION_FILESYSTEM_SUPPORT "allow file system support" ON)

#######################################################################
if(DOXYGEN_FOUND)
    option(OPTION_BUILD_HTML_DOCUMENTATION "build html docs" OFF)
    option(OPTION_INSTALL_HTML_DOCUMENTATION "install html docs" OFF)
    if(LATEX_FOUND)
	option(OPTION_BUILD_PDF_DOCUMENTATION "build pdf docs" OFF)
	option(OPTION_INSTALL_PDF_DOCUMENTATION "install pdf docs" OFF)
    endif(LATEX_FOUND)
endif(DOXYGEN_FOUND)

if(OPTION_BUILD_HTML_DOCUMENTATION OR OPTION_BUILD_PDF_DOCUMENTATION)
    add_subdirectory(documentation)
endif(OPTION_BUILD_HTML_DOCUMENTATION OR OPTION_BUILD_PDF_DOCUMENTATION)

#######################################################################
include(FindPkgConfig)

option(OPTION_CAIRO "use lib Cairo" OFF)
option(OPTION_CAIROEXT
   "use FLTK code instrumentation for cairo extended use" OFF
   )

if(OPTION_CAIRO OR OPTION_CAIROEXT AND LIB_CAIRO)
   pkg_search_module(PKG_CAIRO cairo)
endif(OPTION_CAIRO OR OPTION_CAIROEXT AND LIB_CAIRO)

if(PKG_CAIRO_FOUND)
   set(FLTK_HAVE_CAIRO 1)
   add_subdirectory(cairo)
   list(APPEND FLTK_LDLIBS -lcairo -lpixman-1)
   include_directories(${PKG_CAIRO_INCLUDE_DIRS})
   string(REPLACE ";" " " CAIROFLAGS "${PKG_CAIRO_CFLAGS}")
endif(PKG_CAIRO_FOUND)

if(LIB_CAIRO AND OPTION_CAIROEXT AND PKG_CAIRO_FOUND)
   set(FLTK_USE_CAIRO 1)
   set(FLTK_CAIRO_FOUND TRUE)
else()
   set(FLTK_CAIRO_FOUND FALSE)
endif(LIB_CAIRO AND OPTION_CAIROEXT AND PKG_CAIRO_FOUND)

#######################################################################
set(HAVE_GL LIB_GL OR LIB_MesaGL)

if(HAVE_GL)
   option(OPTION_USE_GL "use OpenGL" ON)
endif(HAVE_GL)

if(OPTION_USE_GL)
   if(OPTION_APPLE_X11)
      set(OPENGL_FOUND TRUE)
      get_filename_component(PATH_TO_XLIBS ${X11_X11_LIB} PATH)
      set(OPENGL_LIBRARIES -L${PATH_TO_XLIBS} -lGLU -lGL)
   elseif(OPTION_APPLE_SDL)
      set(OPENGL_FOUND FALSE)
   else()
      include(FindOpenGL)
      if(APPLE)
         set(HAVE_GL_GLU_H ${HAVE_OPENGL_GLU_H})
      endif(APPLE)
   endif(OPTION_APPLE_X11)
endif(OPTION_USE_GL)

if(OPENGL_FOUND)
   set(CMAKE_REQUIRED_INCLUDES ${OPENGL_INCLUDE_DIR}/GL)
   set(GLLIB "-lGLU -lGL")

   # check if function glXGetProcAddressARB exists
   set(TEMP_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
   set(CMAKE_REQUIRED_LIBRARIES GLU GL)
   CHECK_FUNCTION_EXISTS(glXGetProcAddressARB HAVE_GLXGETPROCADDRESSARB)
   set(CMAKE_REQUIRED_LIBRARIES ${TEMP_REQUIRED_LIBRARIES})
   unset(TEMP_REQUIRED_LIBRARIES)

   set(FLTK_GL_FOUND TRUE)
else()
   set(FLTK_GL_FOUND FALSE)
endif(OPENGL_FOUND)

#######################################################################
# Create an option whether we want to check for pthreads.
# We must not do it on Windows unless we run under Cygwin, since we
# always use native threads on Windows (even if libpthread is available).

# Note: HAVE_PTHREAD_H has already been determined in resources.cmake
# before this file is included (or set to 0 for WIN32).

if (WIN32 AND NOT CYGWIN)
  # set(HAVE_PTHREAD_H 0) # (see resources.cmake)
  set(OPTION_USE_THREADS FALSE)
else ()
  option(OPTION_USE_THREADS "use multi-threading with pthreads" ON)
endif (WIN32 AND NOT CYGWIN)

# initialize more variables
set(USE_THREADS 0)
set(HAVE_PTHREAD 0)
set(FLTK_PTHREADS_FOUND FALSE)

if (OPTION_USE_THREADS)

  include(FindThreads)

  if (CMAKE_HAVE_THREADS_LIBRARY)
    add_definitions("-D_THREAD_SAFE -D_REENTRANT")
    set(USE_THREADS 1)
    set(FLTK_THREADS_FOUND TRUE)
  endif (CMAKE_HAVE_THREADS_LIBRARY)

  if (CMAKE_USE_PTHREADS_INIT AND NOT WIN32)
    set(HAVE_PTHREAD 1)
    if (NOT APPLE)
      set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -pthread")
    endif (NOT APPLE)
    list(APPEND FLTK_LDLIBS -lpthread)
    list(APPEND FLTK_CFLAGS -D_THREAD_SAFE -D_REENTRANT)
    set(FLTK_PTHREADS_FOUND TRUE)
  else()
    set(HAVE_PTHREAD 0)
    set(HAVE_PTHREAD_H 0)
    set(FLTK_PTHREADS_FOUND FALSE)
  endif(CMAKE_USE_PTHREADS_INIT AND NOT WIN32)

else (OPTION_USE_THREADS)

  set(HAVE_PTHREAD_H 0)

endif (OPTION_USE_THREADS)

set(debug_threads FALSE) # set to true to show debug info
if (debug_threads)
  message ("")
  message (STATUS "NOTE: set debug_threads to FALSE to disable this info!")
  message (STATUS "WIN32                  = '${WIN32}'")
  message (STATUS "MINGW                  = '${MINGW}'")
  message (STATUS "CYGWIN                 = '${CYGWIN}'")
  message (STATUS "OPTION_USE_THREADS     = '${OPTION_USE_THREADS}'")
  message (STATUS "HAVE_PTHREAD           = '${HAVE_PTHREAD}'")
  message (STATUS "HAVE_PTHREAD_H         = '${HAVE_PTHREAD_H}'")
  message (STATUS "FLTK_THREADS_FOUND     = '${FLTK_THREADS_FOUND}'")
  message (STATUS "CMAKE_EXE_LINKER_FLAGS = '${CMAKE_EXE_LINKER_FLAGS}'")
endif (debug_threads)
unset(debug_threads)

#######################################################################
option(OPTION_LARGE_FILE "enable large file support" ON)

if(OPTION_LARGE_FILE)
   if(NOT MSVC)
      add_definitions(-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE)
      list(APPEND FLTK_CFLAGS -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE)
   endif(NOT MSVC)
endif(OPTION_LARGE_FILE)

#######################################################################
option(OPTION_USE_SYSTEM_ZLIB "use system zlib" ON)

if(OPTION_USE_SYSTEM_ZLIB AND LIB_zlib)
   include(FindZLIB)
endif(OPTION_USE_SYSTEM_ZLIB AND LIB_zlib)

if(OPTION_USE_SYSTEM_ZLIB AND ZLIB_FOUND)
   set(FLTK_ZLIB_LIBRARIES ${ZLIB_LIBRARIES})
   include_directories(${ZLIB_INCLUDE_DIRS})
   set(FLTK_BUILTIN_ZLIB_FOUND FALSE)
else()
   add_subdirectory(zlib)
   set(FLTK_ZLIB_LIBRARIES fltk_z)
   set(ZLIB_INCLUDE_DIR ${FLTK_SOURCE_DIR}/zlib)
   include_directories(${FLTK_SOURCE_DIR}/zlib)
   set(FLTK_BUILTIN_ZLIB_FOUND TRUE)
endif(OPTION_USE_SYSTEM_ZLIB AND ZLIB_FOUND)

if(OPTION_USE_SYSTEM_ZLIB AND NOT ZLIB_FOUND)
   message(STATUS "\ncannot find system zlib library - using built-in\n")
endif(OPTION_USE_SYSTEM_ZLIB AND NOT ZLIB_FOUND)

set(HAVE_LIBZ 1)

#######################################################################
option(OPTION_USE_SYSTEM_LIBJPEG "use system libjpeg" ON)

if(OPTION_USE_SYSTEM_LIBJPEG AND LIB_jpeg)
   include(FindJPEG)
endif(OPTION_USE_SYSTEM_LIBJPEG AND LIB_jpeg)

if(OPTION_USE_SYSTEM_LIBJPEG AND JPEG_FOUND)
   set(FLTK_JPEG_LIBRARIES ${JPEG_LIBRARIES})
   include_directories(${JPEG_INCLUDE_DIR})
   set(FLTK_BUILTIN_JPEG_FOUND FALSE)
else()
   add_subdirectory(jpeg)
   set(FLTK_JPEG_LIBRARIES fltk_jpeg)
   include_directories(${FLTK_SOURCE_DIR}/jpeg)
   set(FLTK_BUILTIN_JPEG_FOUND TRUE)
endif(OPTION_USE_SYSTEM_LIBJPEG AND JPEG_FOUND)

if(OPTION_USE_SYSTEM_LIBJPEG AND NOT JPEG_FOUND)
   message(STATUS "\ncannot find system jpeg library - using built-in\n")
endif(OPTION_USE_SYSTEM_LIBJPEG AND NOT JPEG_FOUND)

set(HAVE_LIBJPEG 1)

#######################################################################
option(OPTION_USE_SYSTEM_LIBPNG "use system libpng" ON)

if(OPTION_USE_SYSTEM_LIBPNG AND LIB_png)
   include(FindPNG)
endif(OPTION_USE_SYSTEM_LIBPNG AND LIB_png)

if(OPTION_USE_SYSTEM_LIBPNG AND PNG_FOUND)
   set(FLTK_PNG_LIBRARIES ${PNG_LIBRARIES})
   include_directories(${PNG_INCLUDE_DIR})
   add_definitions(${PNG_DEFINITIONS})
   set(FLTK_BUILTIN_PNG_FOUND FALSE)
else()
   add_subdirectory(png)
   set(FLTK_PNG_LIBRARIES fltk_png)
   set(HAVE_PNG_H 1)
   set(HAVE_PNG_GET_VALID 1)
   set(HAVE_PNG_SET_TRNS_TO_ALPHA 1)
   include_directories(${FLTK_SOURCE_DIR}/png)
   set(FLTK_BUILTIN_PNG_FOUND TRUE)
endif(OPTION_USE_SYSTEM_LIBPNG AND PNG_FOUND)

if(OPTION_USE_SYSTEM_LIBPNG AND NOT PNG_FOUND)
   message(STATUS "\ncannot find system png library - using built-in\n")
endif(OPTION_USE_SYSTEM_LIBPNG AND NOT PNG_FOUND)

set(HAVE_LIBPNG 1)

#######################################################################
if(X11_Xinerama_FOUND)
   option(OPTION_USE_XINERAMA "use lib Xinerama" ON)
endif(X11_Xinerama_FOUND)

if(OPTION_USE_XINERAMA)
   set(HAVE_XINERAMA ${X11_Xinerama_FOUND})
   include_directories(${X11_Xinerama_INCLUDE_PATH})
   list(APPEND FLTK_LDLIBS -lXinerama)
   set(FLTK_XINERAMA_FOUND TRUE)
else()
   set(FLTK_XINERAMA_FOUND FALSE)
endif(OPTION_USE_XINERAMA)

#######################################################################
if(X11_Xfixes_FOUND)
   option(OPTION_USE_XFIXES "use lib Xfixes" ON)
endif(X11_Xfixes_FOUND)

if(OPTION_USE_XFIXES)
   set(HAVE_XFIXES ${X11_Xfixes_FOUND})
   include_directories(${X11_Xfixes_INCLUDE_PATH})
   list(APPEND FLTK_LDLIBS -lXfixes)
   set(FLTK_XFIXES_FOUND TRUE)
else()
   set(FLTK_XFIXES_FOUND FALSE)
endif(OPTION_USE_XFIXES)

#######################################################################
if(X11_Xcursor_FOUND)
   option(OPTION_USE_XCURSOR "use lib Xcursor" ON)
endif(X11_Xcursor_FOUND)

if(OPTION_USE_XCURSOR)
   set(HAVE_XCURSOR ${X11_Xcursor_FOUND})
   include_directories(${X11_Xcursor_INCLUDE_PATH})
   list(APPEND FLTK_LDLIBS -lXcursor)
   set(FLTK_XCURSOR_FOUND TRUE)
else()
   set(FLTK_XCURSOR_FOUND FALSE)
endif(OPTION_USE_XCURSOR)

#######################################################################
if(X11_Xft_FOUND)
   option(OPTION_USE_XFT "use lib Xft" ON)
   option(OPTION_USE_PANGO "use lib Pango" OFF)
endif(X11_Xft_FOUND)

#######################################################################
if(X11_Xft_FOUND AND OPTION_USE_PANGO)
#this covers Debian, Ubuntu, FreeBSD, NetBSD, Darwin
   if(APPLE AND OPTION_APPLE_X11)
	list(APPEND CMAKE_INCLUDE_PATH  /sw/include)
    	list(APPEND CMAKE_LIBRARY_PATH  /sw/lib)
   endif(APPLE AND OPTION_APPLE_X11)
   find_file(HAVE_PANGO_H pango-1.0/pango/pango.h ${CMAKE_INCLUDE_PATH})
   find_file(HAVE_PANGOXFT_H pango-1.0/pango/pangoxft.h ${CMAKE_INCLUDE_PATH})

  if(HAVE_PANGO_H AND HAVE_PANGOXFT_H)
    find_library(HAVE_LIB_PANGO pango-1.0 ${CMAKE_LIBRARY_PATH})
    find_library(HAVE_LIB_PANGOXFT pangoxft-1.0 ${CMAKE_LIBRARY_PATH})
    if(APPLE)
    	set(HAVE_LIB_GOBJECT TRUE)
    else()
    	find_library(HAVE_LIB_GOBJECT gobject-2.0 ${CMAKE_LIBRARY_PATH})
    endif(APPLE)
  endif(HAVE_PANGO_H AND HAVE_PANGOXFT_H)
  if(HAVE_LIB_PANGO AND HAVE_LIB_PANGOXFT AND HAVE_LIB_GOBJECT)
    set(USE_PANGO TRUE)
    message(STATUS "USE_PANGO=" ${USE_PANGO})
    #remove last 3 components of HAVE_PANGO_H and put in PANGO_H_PREFIX
    get_filename_component(PANGO_H_PREFIX ${HAVE_PANGO_H} PATH)
    get_filename_component(PANGO_H_PREFIX ${PANGO_H_PREFIX} PATH)
    get_filename_component(PANGO_H_PREFIX ${PANGO_H_PREFIX} PATH)

    get_filename_component(PANGOLIB_DIR ${HAVE_LIB_PANGO} PATH)
    #glib.h is usually in ${PANGO_H_PREFIX}/glib-2.0/ ...
    find_path(GLIB_H_PATH glib.h ${PANGO_H_PREFIX}/glib-2.0)
    if(NOT GLIB_H_PATH) # ... but not under NetBSD
		find_path(GLIB_H_PATH glib.h ${PANGO_H_PREFIX}/glib/glib-2.0)
    endif(NOT GLIB_H_PATH)
    include_directories(${PANGO_H_PREFIX}/pango-1.0 ${GLIB_H_PATH} ${PANGOLIB_DIR}/glib-2.0/include)
  endif(HAVE_LIB_PANGO AND HAVE_LIB_PANGOXFT AND HAVE_LIB_GOBJECT)
endif(X11_Xft_FOUND AND OPTION_USE_PANGO)

if(OPTION_USE_XFT)
   set(USE_XFT X11_Xft_FOUND)
   list(APPEND FLTK_LDLIBS -lXft)
   set(FLTK_XFT_FOUND TRUE)
else()
   set(FLTK_XFT_FOUND FALSE)
endif(OPTION_USE_XFT)

#######################################################################
if(X11_Xrender_FOUND)
   option(OPTION_USE_XRENDER "use lib Xrender" ON)
endif(X11_Xrender_FOUND)

if(OPTION_USE_XRENDER)
   set(HAVE_XRENDER ${X11_Xrender_FOUND})
   if(HAVE_XRENDER)
      include_directories(${X11_Xrender_INCLUDE_PATH})
      list(APPEND FLTK_LDLIBS -lXrender)
      set(FLTK_XRENDER_FOUND TRUE)
   else(HAVE_XRENDER)
      set(FLTK_XRENDER_FOUND FALSE)
   endif(HAVE_XRENDER)
else(OPTION_USE_XRENDER)
   set(FLTK_XRENDER_FOUND FALSE)
endif(OPTION_USE_XRENDER)

#######################################################################
if(X11_FOUND)
   option(OPTION_USE_XDBE "use lib Xdbe" ON)
endif(X11_FOUND)

if(OPTION_USE_XDBE AND HAVE_XDBE_H)
   set(HAVE_XDBE 1)
   set(FLTK_XDBE_FOUND TRUE)
else()
   set(FLTK_XDBE_FOUND FALSE)
endif(OPTION_USE_XDBE AND HAVE_XDBE_H)

#######################################################################
set(FL_NO_PRINT_SUPPORT FALSE)
if(X11_FOUND AND NOT OPTION_PRINT_SUPPORT)
   set(FL_NO_PRINT_SUPPORT TRUE)
endif(X11_FOUND AND NOT OPTION_PRINT_SUPPORT)
#######################################################################

#######################################################################
set(FL_CFG_NO_FILESYSTEM_SUPPORT TRUE)
if(OPTION_FILESYSTEM_SUPPORT)
   set(FL_CFG_NO_FILESYSTEM_SUPPORT FALSE)
endif(OPTION_FILESYSTEM_SUPPORT)
#######################################################################

#######################################################################
# prior to CMake 3.0 this feature was buggy
if(NOT CMAKE_VERSION VERSION_LESS 3.0.0)
    option(CMAKE_SUPPRESS_REGENERATION
	   "suppress rules to re-run CMake on rebuild" OFF)
    mark_as_advanced(CMAKE_SUPPRESS_REGENERATION)
endif(NOT CMAKE_VERSION VERSION_LESS 3.0.0)