Use hunter to download dependencies if HUNTER_ENABLED is ON

CMakeLists.txt

@@ -34,8 +34,7 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #----------------------------------------------------------------------
-SET(CMAKE_LEGACY_CYGWIN_WIN32 0) # Remove when CMake >= 2.8.4 is required
+CMAKE_MINIMUM_REQUIRED( VERSION 3.0 )
-CMAKE_MINIMUM_REQUIRED( VERSION 2.8 )
 
 # Toggles the use of the hunter package manager
 option(HUNTER_ENABLED "Enable Hunter package manager support" OFF)
@@ -386,6 +385,15 @@ ENDIF( SYSTEM_IRRXML )
 
 # Search for external dependencies, and build them from source if not found
 # Search for zlib
+IF(HUNTER_ENABLED)
+  hunter_add_package(ZLIB)
+  find_package(ZLIB CONFIG REQUIRED)
+
+  add_definitions(-DASSIMP_BUILD_NO_OWN_ZLIB)
+  set(ZLIB_FOUND TRUE)
+  set(ZLIB_LIBRARIES ZLIB::zlib)
+  set(ASSIMP_BUILD_MINIZIP TRUE)
+ELSE(HUNTER_ENABLED)
   IF ( NOT ASSIMP_BUILD_ZLIB )
     FIND_PACKAGE(ZLIB)
   ENDIF( NOT ASSIMP_BUILD_ZLIB )
@@ -416,8 +424,8 @@ ELSE(NOT ZLIB_FOUND)
     SET(ZLIB_LIBRARIES_LINKED -lz)
   ENDIF(NOT ZLIB_FOUND)
   INCLUDE_DIRECTORIES(${ZLIB_INCLUDE_DIR})
+ENDIF(HUNTER_ENABLED)
 
-# Search for unzip
 IF( NOT IOS )
   IF( NOT ASSIMP_BUILD_MINIZIP )
     use_pkgconfig(UNZIP minizip)
@@ -501,7 +509,9 @@ ELSE (ASSIMP_BUILD_NONFREE_C4D_IMPORTER)
   ADD_DEFINITIONS( -DASSIMP_BUILD_NO_C4D_IMPORTER )
 ENDIF (ASSIMP_BUILD_NONFREE_C4D_IMPORTER)
 
+IF(NOT HUNTER_ENABLED)
   ADD_SUBDIRECTORY(contrib)
+ENDIF(NOT HUNTER_ENABLED)
 
 ADD_SUBDIRECTORY( code/ )
 IF ( ASSIMP_BUILD_ASSIMP_TOOLS )

code/CMakeLists.txt

@@ -43,7 +43,7 @@
 # 3) Add libassimp using the file lists (eliminates duplication of file names between
 #    source groups and library command)
 #
-cmake_minimum_required( VERSION 2.6 )
+cmake_minimum_required( VERSION 3.0 )
 SET( HEADER_PATH ../include/assimp )
 
 if(NOT ANDROID AND ASSIMP_ANDROID_JNIIOSYSTEM)
@@ -848,12 +848,39 @@ SET( Extra_SRCS
 )
 SOURCE_GROUP( Extra FILES ${Extra_SRCS})
 
+# irrXML
+IF(HUNTER_ENABLED)
+  hunter_add_package(irrXML)
+  find_package(irrXML CONFIG REQUIRED)
+ELSE(HUNTER_ENABLED)
+  # irrXML already included in contrib directory by parent CMakeLists.txt.
+ENDIF(HUNTER_ENABLED)
+
+# utf8
+IF(HUNTER_ENABLED)
+  hunter_add_package(utf8)
+  find_package(utf8 CONFIG REQUIRED)
+ELSE(HUNTER_ENABLED)
+  # utf8 is header-only, so Assimp doesn't need to do anything.
+ENDIF(HUNTER_ENABLED)
+
+# polyclipping
+IF(HUNTER_ENABLED)
+  hunter_add_package(polyclipping)
+  find_package(polyclipping CONFIG REQUIRED)
+ELSE(HUNTER_ENABLED)
   SET( Clipper_SRCS
     ../contrib/clipper/clipper.hpp
     ../contrib/clipper/clipper.cpp
   )
   SOURCE_GROUP( Contrib\\Clipper FILES ${Clipper_SRCS})
+ENDIF(HUNTER_ENABLED)
 
+# poly2tri
+IF(HUNTER_ENABLED)
+  hunter_add_package(poly2tri)
+  find_package(poly2tri CONFIG REQUIRED)
+ELSE(HUNTER_ENABLED)
   SET( Poly2Tri_SRCS
     ../contrib/poly2tri/poly2tri/common/shapes.cc
     ../contrib/poly2tri/poly2tri/common/shapes.h
@@ -868,7 +895,13 @@ SET( Poly2Tri_SRCS
     ../contrib/poly2tri/poly2tri/sweep/sweep_context.h
   )
   SOURCE_GROUP( Contrib\\Poly2Tri FILES ${Poly2Tri_SRCS})
+ENDIF(HUNTER_ENABLED)
 
+# minizip/unzip
+IF(HUNTER_ENABLED)
+  hunter_add_package(minizip)
+  find_package(minizip CONFIG REQUIRED)
+ELSE(HUNTER_ENABLED)
   SET( unzip_SRCS
     ../contrib/unzip/crypt.h
     ../contrib/unzip/ioapi.c
@@ -877,7 +910,13 @@ SET( unzip_SRCS
     ../contrib/unzip/unzip.h
   )
   SOURCE_GROUP(Contrib\\unzip FILES ${unzip_SRCS})
+ENDIF(HUNTER_ENABLED)
 
+# zip (https://github.com/kuba--/zip)
+IF(HUNTER_ENABLED)
+  hunter_add_package(zip)
+  find_package(zip CONFIG REQUIRED)
+ELSE(HUNTER_ENABLED)
   SET( ziplib_SRCS
     ../contrib/zip/src/miniz.h
     ../contrib/zip/src/zip.c
@@ -892,7 +931,13 @@ else()
   endif()
 
   SOURCE_GROUP( ziplib FILES ${ziplib_SRCS} )
+ENDIF(HUNTER_ENABLED)
 
+# openddlparser
+IF(HUNTER_ENABLED)
+  hunter_add_package(openddlparser)
+  find_package(openddlparser CONFIG REQUIRED)
+ELSE(HUNTER_ENABLED)
   SET ( openddl_parser_SRCS
     ../contrib/openddlparser/code/OpenDDLParser.cpp
     ../contrib/openddlparser/code/DDLNode.cpp
@@ -909,7 +954,12 @@ SET ( openddl_parser_SRCS
     ../contrib/openddlparser/include/openddlparser/Value.h
   )
   SOURCE_GROUP( Contrib\\openddl_parser FILES ${openddl_parser_SRCS})
+ENDIF(HUNTER_ENABLED)
 
+# Open3DGC
+IF(HUNTER_ENABLED)
+  # Nothing to do, not available in Hunter yet.
+ELSE(HUNTER_ENABLED)
   SET ( open3dgc_SRCS
     ../contrib/Open3DGC/o3dgcAdjacencyInfo.h
     ../contrib/Open3DGC/o3dgcArithmeticCodec.cpp
@@ -942,22 +992,29 @@ SET ( open3dgc_SRCS
     ../contrib/Open3DGC/o3dgcVector.inl
   )
   SOURCE_GROUP( Contrib\\open3dgc FILES ${open3dgc_SRCS})
+ENDIF(HUNTER_ENABLED)
 
 # Check dependencies for glTF importer with Open3DGC-compression.
 # RT-extensions is used in "contrib/Open3DGC/o3dgcTimer.h" for collecting statistics. Pointed file
 # has implementation for different platforms: WIN32, __MACH__ and other ("else" block).
 FIND_PACKAGE(RT QUIET)
-IF (RT_FOUND OR MSVC)
+IF (NOT HUNTER_ENABLED AND (RT_FOUND OR MSVC))
   SET( ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC 1 )
   ADD_DEFINITIONS( -DASSIMP_IMPORTER_GLTF_USE_OPEN3DGC=1 )
 ELSE ()
   SET (open3dgc_SRCS "")
-  MESSAGE (INFO " RT-extension not found. glTF import/export will be built without Open3DGC-compression.")
+  MESSAGE (INFO " Hunter enabled or RT-extension not found. glTF import/export will be built without Open3DGC-compression.")
   #!TODO: off course is better to remove statistics timers from o3dgc codec. Or propose to choose what to use.
 ENDIF ()
 
+# RapidJSON
+IF(HUNTER_ENABLED)
+  hunter_add_package(RapidJSON)
+  find_package(RapidJSON CONFIG REQUIRED)
+ELSE(HUNTER_ENABLED)
   INCLUDE_DIRECTORIES( "../contrib/rapidjson/include" )
   INCLUDE_DIRECTORIES( "../contrib" )
+ENDIF(HUNTER_ENABLED)
 
 # VC2010 fixes
 if(MSVC10)
@@ -974,12 +1031,14 @@ if ( MSVC )
   ADD_DEFINITIONS( -D_CRT_SECURE_NO_WARNINGS )
 endif ( MSVC )
 
+IF(NOT HUNTER_ENABLED)
   if (UNZIP_FOUND)
     SET (unzip_compile_SRCS "")
   else (UNZIP_FOUND)
     SET (unzip_compile_SRCS ${unzip_SRCS})
     INCLUDE_DIRECTORIES( "../contrib/unzip/" )
   endif (UNZIP_FOUND)
+ENDIF(NOT HUNTER_ENABLED)
 
 MESSAGE(STATUS "Enabled importer formats:${ASSIMP_IMPORTERS_ENABLED}")
 MESSAGE(STATUS "Disabled importer formats:${ASSIMP_IMPORTERS_DISABLED}")
@@ -1018,10 +1077,12 @@ SET( assimp_src
 )
 ADD_DEFINITIONS( -DOPENDDLPARSER_BUILD )
 
+IF(NOT HUNTER_ENABLED)
   INCLUDE_DIRECTORIES(
       ${IRRXML_INCLUDE_DIR}
       ../contrib/openddlparser/include
   )
+ENDIF(NOT HUNTER_ENABLED)
 
 IF (ASSIMP_BUILD_NONFREE_C4D_IMPORTER)
   SET( assimp_src ${assimp_src} ${C4D_SRCS})
@@ -1037,7 +1098,22 @@ TARGET_INCLUDE_DIRECTORIES ( assimp PUBLIC
   $<INSTALL_INTERFACE:${CMAKE_INSTALL_PREFIX}/include>
 )
 
+IF(HUNTER_ENABLED)
+  TARGET_LINK_LIBRARIES(assimp
+      PUBLIC
+      polyclipping::polyclipping
+      irrXML::irrXML
+      openddlparser::openddl_parser
+      poly2tri::poly2tri
+      minizip::minizip
+      ZLIB::zlib
+      RapidJSON::rapidjson
+      utf8::utf8
+      zip::zip
+  )
+ELSE(HUNTER_ENABLED)
   TARGET_LINK_LIBRARIES(assimp ${ZLIB_LIBRARIES} ${OPENDDL_PARSER_LIBRARIES} ${IRRXML_LIBRARY} )
+ENDIF(HUNTER_ENABLED)
 
 if(ASSIMP_ANDROID_JNIIOSYSTEM)
   set(ASSIMP_ANDROID_JNIIOSYSTEM_PATH port/AndroidJNI)
@@ -1119,12 +1195,14 @@ ENDIF(APPLE)
 
 # Build against external unzip, or add ../contrib/unzip so
 # assimp can #include "unzip.h"
+IF(NOT HUNTER_ENABLED)
   if (UNZIP_FOUND)
     INCLUDE_DIRECTORIES(${UNZIP_INCLUDE_DIRS})
     TARGET_LINK_LIBRARIES(assimp ${UNZIP_LIBRARIES})
   else (UNZIP_FOUND)
     INCLUDE_DIRECTORIES("../")
   endif (UNZIP_FOUND)
+ENDIF(NOT HUNTER_ENABLED)
 
 # Add RT-extension library for glTF importer with Open3DGC-compression.
 IF (RT_FOUND AND ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC)

test/CMakeLists.txt

@@ -37,7 +37,7 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 #----------------------------------------------------------------------
-cmake_minimum_required( VERSION 2.6 )
+cmake_minimum_required( VERSION 3.0 )
 
 INCLUDE_DIRECTORIES(
 	${Assimp_SOURCE_DIR}/contrib/gtest/include