feat: add CMake support for OpenNURBS

CMakeLists.txt

@@ -0,0 +1,97 @@
+cmake_minimum_required(VERSION 3.15)
+
+project(OpenNURBS CXX C)
+
+# OpenNURBS source
+file(GLOB OpenNURBS_SOURCE "${CMAKE_SOURCE_DIR}/*.h"
+     "${CMAKE_SOURCE_DIR}/*.cpp")
+
+# Build the opennurbs library
+if(RW3DM_BUILD_ON_DLL)
+  # if dynamic
+
+  # Cannot build as shared library on Linux
+  if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+    message(
+      FATAL_ERROR
+        "Building OpenNURBS as a shared library is not supported on Linux")
+  endif()
+
+  # Generate a shared library
+  add_library(opennurbs SHARED ${OpenNURBS_SOURCE})
+  set_target_properties(opennurbs PROPERTIES DEBUG_POSTFIX "d")
+
+  # define opennurbs_EXPORTS
+  target_compile_definitions(opennurbs PRIVATE opennurbs_EXPORTS)
+
+  # Install opennurbs DLL
+  install(TARGETS opennurbs DESTINATION ${RW3DM_INSTALL_DIR})
+else()
+  # if static
+
+  if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
+    add_library(opennurbs STATIC ${OpenNURBS_SOURCE})
+  else()
+    # Include UUID source (bundled with opennurbs)
+    file(GLOB UUID_SRC "${CMAKE_SOURCE_DIR}/android_uuid/*.h"
+         "${CMAKE_SOURCE_DIR}/android_uuid/*.c")
+    list(REMOVE_ITEM UUID_SRC "${CMAKE_SOURCE_DIR}/android_uuid/gen_uuid_nt.c")
+
+    # Need to combine all source files for static linking on non-windows
+    add_library(opennurbs STATIC ${UUID_SRC} ${OpenNURBS_SOURCE})
+  endif()
+endif()
+
+# compile definitions
+target_compile_definitions(
+  opennurbs
+  PRIVATE
+    ON_COMPILING_OPENNURBS _GNU_SOURCE
+    OPENNURBS_INPUT_LIBS_DIR="${CMAKE_CURRENT_BINARY_DIR}/$<CONFIGURATION>"
+    UNICODE)
+
+if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
+  # Windows specific
+
+  # Fix "WIN32" preprocessor definitions on x64
+  if(${CMAKE_SIZEOF_VOID_P} EQUAL "8")
+    string(REPLACE "/DWIN32" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+    target_compile_definitions(opennurbs PRIVATE WIN64)
+  endif()
+
+elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+  # Linux specific
+
+  # Linux compiler definitions
+  target_compile_definitions(opennurbs PRIVATE ON_RUNTIME_LINUX
+                                               ON_CLANG_CONSTRUCTOR_BUG)
+endif()
+
+# Dependencies
+
+# zlib
+if(NOT ${opennurbs_ZLIB_LIB_DIR})
+  # build zlib as static library (bundled with OpenNURBS)
+  file(GLOB ZLIB_SOURCE "${CMAKE_SOURCE_DIR}/zlib/*.h"
+       "${CMAKE_SOURCE_DIR}/zlib/*.c")
+  add_library(zlib STATIC ${ZLIB_SOURCE})
+  target_compile_definitions(zlib PRIVATE MY_ZCALLOC Z_PREFIX)
+endif()
+# zlib-specific flags for opennurbs
+target_compile_definitions(
+  opennurbs
+  PRIVATE MY_ZCALLOC Z_PREFIX
+          opennurbs_ZLIB_LIB_DIR="${CMAKE_CURRENT_BINARY_DIR}/$<CONFIGURATION>")
+target_link_libraries(opennurbs PRIVATE zlib)
+
+# shlwapi on windows
+if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
+  target_link_libraries(opennurbs PRIVATE shlwapi)
+endif()
+
+# cross_dirent
+target_include_directories(opennurbs PRIVATE "${CMAKE_SOURCE_DIR}/cross_dirent")
+
+# Set the outputs of OpenNURBS CMake
+set(OpenNURBS_LIBRARY ${opennurbs})
+set(OpenNURBS_INCLUDE_DIR "${CMAKE_CURRENT_LIST_DIR}/opennurbs")

README.md

@@ -28,6 +28,13 @@ Please see ["Getting started"](https://developer.rhino3d.com/guides/opennurbs/ge
 
 There's also a collection of [example 3dm files](example_files/) available for testing.
 
+# Building Using CMake:
+
+1. Clone the repository 
+2. `cd` to the root directory of the repository.
+3. Run `cmake -S ./ -B ./build` to configure the CMake files
+4. Run `cmake --build ./build --config Release` to build the library.
+
 ## Questions?
 
 For technical support, please head over to [Discourse](https://discourse.mcneel.com/category/opennurbs).