move to new build system

cmake/libraries/sfml.cmake

@@ -0,0 +1,66 @@
+if(PROJECT_ENABLE_SFML)
+  if(PROJECT_BUILD)
+    find_package(OpenGL REQUIRED)
+    find_package(X11 REQUIRED)
+
+    find_package(SFML ${SFML_VERSION}
+      COMPONENTS 
+        audio
+        graphics
+        network
+        system
+        window
+      REQUIRED
+    )
+
+    add_definitions(-DPROJECT_ENABLE_SFML)
+
+    if(PROJECT_BUILD_SHARED_LIBS)
+      link_libraries(
+        ${X11_LIBRARIES}
+        sfml-audio
+        sfml-graphics
+        sfml-network
+        sfml-system
+        sfml-window
+      )
+    else()
+      link_libraries(
+        ${X11_LIBRARIES}
+        sfml-audio-s
+        sfml-graphics-s
+        sfml-network-s
+        sfml-system-s
+        sfml-window-s
+      )
+    endif()
+
+    include_directories(BEFORE SYSTEM
+      ${X11_INCLUDE_DIR}
+      ${SFML_INCLUDE_DIR}
+    )
+  elseif(NOT PROJECT_IS_MINGW OR CMAKE_HOST_WIN32)
+    ExternalProject_Add(sfml_project
+      PREFIX external
+      URL ${PROJECT_3RD_PARTY_DIR}/SFML-${SFML_VERSION}.tar.gz
+      URL_HASH SHA256=82535db9e57105d4f3a8aedabd138631defaedc593cab589c924b7d7a11ffb9d
+      PATCH_COMMAND ${PROJECT_3RD_PARTY_DIR}/SFML_patch.sh
+      LIST_SEPARATOR |
+      CMAKE_ARGS ${PROJECT_EXTERNAL_CMAKE_FLAGS}
+        -DBUILD_SHARED_LIBS=${PROJECT_BUILD_SHARED_LIBS}
+        -DBUILD_STATIC_LIBS=ON
+    )
+
+    set(PROJECT_DEPENDENCIES 
+      ${PROJECT_DEPENDENCIES}
+      sfml_project
+    )
+
+    add_dependencies(sfml_project 
+      flac_project
+      fontconfig_project
+      freetype2_project
+      openal_project
+    )
+  endif()
+endif()