imgui: make backends available as optional components, convert -docking versions into an option

recipes/imgui/all/CMakeLists.txt

@@ -1,56 +1,222 @@
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.15)
 project(imgui LANGUAGES CXX)
 
-set(MISC_DIR ${IMGUI_SRC_DIR}/misc)
-set(EXTRA_FONTS_DIR ${MISC_DIR}/fonts)
-set(IMGUI_EXPORT_HEADERS imgui_export_headers.h)
-
-file(GLOB SOURCE_FILES ${IMGUI_SRC_DIR}/*.cpp)
-file(GLOB HEADER_FILES ${IMGUI_SRC_DIR}/*.h)
-
-file(GLOB EXTRA_FONTS_FILES ${EXTRA_FONTS_DIR}/*.ttf)
-if (MSVC)
-    file(GLOB EXTRA_NATVIS_FILES ${MISC_DIR}/natvis/*.natvis)
+if(NOT DEFINED CMAKE_CXX_STANDARD)
+    set(CMAKE_CXX_STANDARD 11)
 endif()
 
-set(BINARY_TO_COMPRESSED_BIN binary_to_compressed_c)
-
-add_executable(${BINARY_TO_COMPRESSED_BIN} ${EXTRA_FONTS_DIR}/binary_to_compressed_c.cpp)
-target_compile_features(${BINARY_TO_COMPRESSED_BIN} PRIVATE cxx_std_11)
+add_library(imgui
+    imgui.cpp
+    imgui_demo.cpp
+    imgui_draw.cpp
+    imgui_tables.cpp
+    imgui_widgets.cpp
+    misc/cpp/imgui_stdlib.cpp
+)
+target_include_directories(imgui PUBLIC ${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR})
 
-add_library(${PROJECT_NAME} ${SOURCE_FILES})
-set_target_properties(${PROJECT_NAME} PROPERTIES
+set_target_properties(imgui PROPERTIES
     CXX_VISIBILITY_PRESET hidden
+    OBJCXX_VISIBILITY_PRESET hidden
     VISIBILITY_INLINES_HIDDEN ON
 )
+set(IMGUI_EXPORT_HEADER imgui_export.h)
 include(GenerateExportHeader)
-generate_export_header(${PROJECT_NAME}
+generate_export_header(imgui
     EXPORT_MACRO_NAME IMGUI_API
-    EXPORT_FILE_NAME ${IMGUI_EXPORT_HEADERS}
+    EXPORT_FILE_NAME ${IMGUI_EXPORT_HEADER}
 )
-target_include_directories(${PROJECT_NAME} PUBLIC
-    $<BUILD_INTERFACE:${IMGUI_SRC_DIR}>
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
-    $<INSTALL_INTERFACE:include>
+# Enable __declspec(dllexport) in backend libs as well
+add_compile_definitions(imgui_EXPORTS)
+
+if(IMGUI_FREETYPE)
+    find_package(freetype CONFIG REQUIRED)
+    target_sources(imgui PRIVATE misc/freetype/imgui_freetype.cpp)
+    target_link_libraries(imgui PRIVATE freetype)
+    install(FILES misc/freetype/imgui_freetype.h DESTINATION include)
+    if(IMGUI_FREETYPE_LUNASVG)
+        find_package(lunasvg CONFIG REQUIRED)
+        target_link_libraries(imgui PRIVATE lunasvg::lunasvg)
+    endif()
+endif()
+
+if(IMGUI_ENABLE_OSX_DEFAULT_CLIPBOARD_FUNCTIONS)
+    target_link_libraries(imgui PRIVATE "-framework ApplicationServices")
+endif()
+
+if(IMGUI_IMPL_ALLEGRO5)
+    find_package(Allegro CONFIG REQUIRED)
+    add_library(imgui-allegro5 backends/imgui_impl_allegro5.cpp)
+    target_link_libraries(imgui-allegro5 PRIVATE Allegro::allegro Allegro::allegro_ttf Allegro::allegro_font Allegro::allegro_main)
+    install(FILES backends/imgui_impl_allegro5.h DESTINATION include)
+    list(APPEND IMGUI_COMPONENTS imgui-allegro5)
+endif()
+
+if(IMGUI_IMPL_ANDROID)
+    add_library(imgui-android backends/imgui_impl_android.cpp)
+    install(FILES backends/imgui_impl_android.h DESTINATION include)
+    target_link_libraries(imgui-android PRIVATE android log EGL GLESv3)
+    list(APPEND IMGUI_COMPONENTS imgui-android)
+endif()
+
+if(IMGUI_IMPL_DX9)
+    add_library(imgui-dx9 backends/imgui_impl_dx9.cpp)
+    target_link_libraries(imgui-dx9 PRIVATE d3d9)
+    install(FILES backends/imgui_impl_dx9.h DESTINATION include)
+    list(APPEND IMGUI_COMPONENTS imgui-dx9)
+endif()
+
+if(IMGUI_IMPL_DX10)
+    add_library(imgui-dx10 backends/imgui_impl_dx10.cpp)
+    target_link_libraries(imgui-dx9 PRIVATE d3d10)
+    install(FILES backends/imgui_impl_dx10.h DESTINATION include)
+    list(APPEND IMGUI_COMPONENTS imgui-dx10)
+endif()
+
+if(IMGUI_IMPL_DX11)
+    add_library(imgui-dx11 backends/imgui_impl_dx11.cpp)
+    target_link_libraries(imgui-dx11 PRIVATE d3d11)
+    install(FILES backends/imgui_impl_dx11.h DESTINATION include)
+    list(APPEND IMGUI_COMPONENTS imgui-dx11)
+endif()
+
+if(IMGUI_IMPL_DX12)
+    add_library(imgui-dx12 backends/imgui_impl_dx12.cpp)
+    target_link_libraries(imgui-dx12 PRIVATE d3d12)
+    install(FILES backends/imgui_impl_dx12.h DESTINATION include)
+    list(APPEND IMGUI_COMPONENTS imgui-dx12)
+endif()
+
+if(IMGUI_IMPL_GLFW)
+    add_library(imgui-glfw backends/imgui_impl_glfw.cpp)
+    if(NOT EMSCRIPTEN)
+        find_package(glfw3 CONFIG REQUIRED)
+        target_link_libraries(imgui-glfw PRIVATE glfw)
+    endif()
+    install(FILES backends/imgui_impl_glfw.h DESTINATION include)
+    list(APPEND IMGUI_COMPONENTS imgui-glfw)
+endif()
+
+if(IMGUI_IMPL_GLUT)
+    add_library(imgui-glut backends/imgui_impl_glut.cpp)
+    if(NOT EMSCRIPTEN)
+        find_package(GLUT REQUIRED)
+        target_link_libraries(imgui-glut PRIVATE GLUT::GLUT)
+    endif()
+    install(FILES backends/imgui_impl_glut.h DESTINATION include)
+    list(APPEND IMGUI_COMPONENTS imgui-glut)
+endif()
+
+if(IMGUI_IMPL_METAL)
+    enable_language(OBJCXX)
+    add_library(imgui-metal backends/imgui_impl_metal.mm)
+    set_source_files_properties(backends/imgui_impl_metal.mm PROPERTIES COMPILE_FLAGS -fobjc-weak)
+    target_link_libraries(imgui-metal PRIVATE
+        "-framework Foundation"
+        "-framework Metal"
+        "-framework QuartzCore"
+    )
+    install(FILES backends/imgui_impl_metal.h DESTINATION include)
+    if(IMGUI_IMPL_METAL_CPP)
+        find_package(metal-cpp CONFIG REQUIRED)
+        target_link_libraries(imgui-metal PRIVATE metal-cpp::metal-cpp)
+    endif()
+    list(APPEND IMGUI_COMPONENTS imgui-metal)
+endif()
+
+if(IMGUI_IMPL_OPENGL2)
+    find_package(OpenGL REQUIRED)
+    add_library(imgui-opengl2 backends/imgui_impl_opengl2.cpp)
+    target_link_libraries(imgui-opengl2 PRIVATE OpenGL::GL)
+    install(FILES backends/imgui_impl_opengl2.h DESTINATION include)
+    list(APPEND IMGUI_COMPONENTS imgui-opengl2)
+endif()
+
+if(IMGUI_IMPL_OPENGL3)
+    find_package(OpenGL REQUIRED)
+    add_library(imgui-opengl3 backends/imgui_impl_opengl3.cpp)
+    target_link_libraries(imgui-opengl3 PRIVATE OpenGL::GL)
+    install(FILES backends/imgui_impl_opengl3.h DESTINATION include)
+    install(FILES backends/imgui_impl_opengl3_loader.h DESTINATION include)
+    list(APPEND IMGUI_COMPONENTS imgui-opengl3)
+endif()
+
+if(IMGUI_IMPL_OSX)
+    enable_language(OBJCXX)
+    add_library(imgui-osx backends/imgui_impl_osx.mm)
+    target_link_libraries(imgui-osx PRIVATE
+        "-framework AppKit"
+        "-framework Carbon"
+        "-framework Cocoa"
+        "-framework Foundation"
+        "-framework GameController"
+    )
+    install(FILES backends/imgui_impl_osx.h DESTINATION include)
+    if(IMGUI_IMPL_METAL_CPP_EXTENSIONS)
+        find_package(metal-cpp CONFIG REQUIRED)
+        target_link_libraries(imgui-osx PRIVATE metal-cpp::metal-cpp)
+    endif()
+    list(APPEND IMGUI_COMPONENTS imgui-osx)
+endif()
+
+if(IMGUI_IMPL_SDL2)
+    find_package(SDL2 CONFIG REQUIRED)
+    add_library(imgui-sdl2 backends/imgui_impl_sdl2.cpp)
+    target_link_libraries(imgui-sdl2 PRIVATE SDL2::SDL2)
+    install(FILES backends/imgui_impl_sdl2.h DESTINATION include)
+    list(APPEND IMGUI_COMPONENTS imgui-sdl2)
+endif()
+
+if(IMGUI_IMPL_SDLRENDERER2)
+    find_package(SDL2 CONFIG REQUIRED)
+    add_library(imgui-sdlrenderer2 backends/imgui_impl_sdlrenderer2.cpp)
+    target_link_libraries(imgui-sdlrenderer2 PRIVATE SDL2::SDL2)
+    install(FILES backends/imgui_impl_sdlrenderer2.h DESTINATION include)
+    list(APPEND IMGUI_COMPONENTS imgui-sdlrenderer2)
+endif()
+
+if(IMGUI_IMPL_VULKAN)
+    find_package(Vulkan REQUIRED)
+    add_library(imgui-vulkan backends/imgui_impl_vulkan.cpp)
+    target_link_libraries(imgui-vulkan PRIVATE Vulkan::Vulkan)
+    install(FILES backends/imgui_impl_vulkan.h DESTINATION include)
+    list(APPEND IMGUI_COMPONENTS imgui-vulkan)
+endif()
+
+if(IMGUI_IMPL_WIN32)
+    add_library(imgui-win32 backends/imgui_impl_win32.cpp)
+    target_link_libraries(imgui-win32 PRIVATE dwmapi xinput)
+    install(FILES backends/imgui_impl_win32.h DESTINATION include)
+    list(APPEND IMGUI_COMPONENTS imgui-win32)
+endif()
+
+foreach(component ${IMGUI_COMPONENTS})
+    target_link_libraries(${component} PUBLIC imgui)
+endforeach()
+
+if(IMGUI_IMPL_TOOLS)
+    add_executable(binary_to_compressed_c misc/fonts/binary_to_compressed_c.cpp)
+    install(TARGETS binary_to_compressed_c DESTINATION bin)
+endif()
+
+install(TARGETS imgui ${IMGUI_COMPONENTS}
+    ARCHIVE DESTINATION lib
+    LIBRARY DESTINATION lib
+    RUNTIME DESTINATION bin
+)
+
+file(GLOB IMGUI_HEADERS *.h)
+install(FILES
+        misc/cpp/imgui_stdlib.h
+        ${IMGUI_HEADERS}
+        ${PROJECT_BINARY_DIR}/${IMGUI_EXPORT_HEADER}
+    DESTINATION include
 )
-target_compile_features(${PROJECT_NAME} PRIVATE cxx_std_11)
-
-include(GNUInstallDirs)
-
-install(TARGETS ${PROJECT_NAME}
-        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
-        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
-install(TARGETS ${BINARY_TO_COMPRESSED_BIN}
-        DESTINATION ${CMAKE_INSTALL_BINDIR})
-install(FILES ${HEADER_FILES} ${CMAKE_CURRENT_BINARY_DIR}/${IMGUI_EXPORT_HEADERS}
-        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
-        PERMISSIONS OWNER_WRITE OWNER_READ GROUP_READ WORLD_READ)
-install(FILES ${EXTRA_FONTS_FILES}
-        DESTINATION ${CMAKE_INSTALL_PREFIX}/res/fonts
-        PERMISSIONS OWNER_WRITE OWNER_READ GROUP_READ WORLD_READ)
+
+file(GLOB EXTRA_FONTS_FILES misc/fonts/*.ttf)
+install(FILES ${EXTRA_FONTS_FILES} DESTINATION res/fonts)
+
 if (MSVC)
-    install(FILES ${EXTRA_NATVIS_FILES}
-            DESTINATION ${CMAKE_INSTALL_PREFIX}/res/natvis
-            PERMISSIONS OWNER_WRITE OWNER_READ GROUP_READ WORLD_READ)
+    file(GLOB EXTRA_NATVIS_FILES misc/natvis/*.natvis)
+    install(FILES ${EXTRA_NATVIS_FILES} DESTINATION res/natvis)
 endif()