CMakeLists.txt

cmake_minimum_required(VERSION 3.3)
project(imgui)

# find_package(glfw3)
# find_package(OpenGL)
# find_package(glew CONFIG)

set(root ${CMAKE_CURRENT_SOURCE_DIR})

set(phdrs ${root}/imgui.h)
set(hdrs ${root}/imstb_rectpack.h ${root}/imstb_textedit.h ${root}/imstb_truetype.h
    ${root}/imgui_internal.h)
set(srcs ${root}/imgui.cpp
    ${root}/imgui_demo.cpp ${root}/imgui_draw.cpp)
    
option (INCLUDE_VULKAN_IMPL false "Include Vulkan implementation for imgui")
option (INCLUDE_GLFW_IMPL false "Build glfw implementation for imgui")

set(aggregate_impl_hdrs )
set(aggregate_impl_srcs )

if (INCLUDE_VULKAN_IMPL)
    set(aggregate_impl_hdrs ${aggregate_impl_hdrs} ${root}/imgui_impl_vulkan.h)
    set(aggregate_impl_srcs ${aggregate_impl_hdrs} ${root}/imgui_impl_vulkan.cpp)
endif ()

if (INCLUDE_GLFW_IMPL)
    set(aggregate_impl_hdrs ${aggregate_impl_hdrs} ${root}/imgui_impl_glfw.h)
    set(aggregate_impl_srcs ${aggregate_impl_hdrs} ${root}/imgui_impl_glfw.cpp)
endif ()

add_library(imgui STATIC ${phdrs} ${hdrs} ${srcs} ${aggregate_impl_hdrs})
target_include_directories(imgui PUBLIC
    $<BUILD_INTERFACE:${root}>
    $<INSTALL_INTERFACE:include>)
target_compile_definitions(imgui PUBLIC IMGUI_DISABLE_INCLUDE_IMCONFIG_H)

# set(targets imgui)
# set(headers_to_install ${phdrs})

# option (BUILD_EXAMPLES true "Build Imgui Examples")

# if (BUILD_EXAMPLES)
#     if(glfw3_FOUND AND OPENGL_FOUND AND glew_FOUND)
#         message(STATUS "OpenGL, GLEW and GLFW found, installing imgui::glfw-gl3-glew.")

#         # replace #include gl3w.h with glew.h
#         file(STRINGS examples/opengl3_example/imgui_impl_glfw_gl3.cpp cppcontent)
#         set(cppcontent-glew "")
#         foreach(l ${cppcontent})
#             if(l MATCHES "#include.*GL/gl3w.h")
#                 set(l "#include \"GL/glew.h\"")
#             endif()
#             string(APPEND cppcontent-glew "${l}\n")
#         endforeach()
#         set(modified_cpp "${CMAKE_CURRENT_BINARY_DIR}/imgui_impl_glfw_gl3-glew.cpp")
#         file(WRITE "${modified_cpp}" "${cppcontent-glew}")
        
#         add_library(glfw-gl3-glew STATIC
#             "${modified_cpp}"
#             examples/opengl3_example/imgui_impl_glfw_gl3.h
#         )
#         target_include_directories(glfw-gl3-glew PUBLIC
#             $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/examples/opengl3_example>
#             $<INSTALL_INTERFACE:include>)
#         target_link_libraries(glfw-gl3-glew PUBLIC OpenGL::GL GLEW::glew_s glfw imgui)
#         list(APPEND targets glfw-gl3-glew)
#         list(APPEND headers_to_install examples/opengl3_example/imgui_impl_glfw_gl3.h)
#     else()
#         if(NOT OPENGL_FOUND)
#             message(STATUS "OpenGL not found, not installing imgui::glfw-gl3-glew.")
#         endif()
#         if(NOT glew_FOUND)
#             message(STATUS "GLEW not found, not installing imgui::glfw-gl3-glew.")
#         endif()
#         if(NOT glfw3_FOUND)
#             message(STATUS "GLFW not found, not installing imgui::glfw-gl3-glew.")
#         endif()

#     endif()
# endif (BUILD_EXAMPLES)

# install(TARGETS ${targets}
#     EXPORT imgui-targets DESTINATION lib)
# install(EXPORT imgui-targets
#     FILE imgui-config.cmake
#     NAMESPACE imgui::
#     DESTINATION lib/cmake/imgui)
# install(FILES ${headers_to_install}
#     DESTINATION include)