64 lines
3.2 KiB
CMake
64 lines
3.2 KiB
CMake
# The Dear ImGui adapter: a widget that draws a plot into a child region of the
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# framebuffer ImGui is rendering its own chrome into, and feeds that plot
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# ImGui's mouse and keyboard state.
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#
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# ImGui is not a packaging dependency here: it is fetched pinned to a release
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# tag (never a branch, so a build is reproducible) and only the sources this
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# adapter needs are compiled -- the core plus the GLFW and OpenGL 3 backends.
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# The fetched sources are third-party code: they are not held to this project's
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# warning set, and the adapter and its example are.
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include(FetchContent)
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FetchContent_Declare(imgui
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GIT_REPOSITORY https://github.com/ocornut/imgui.git
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GIT_TAG v1.91.9b
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GIT_SHALLOW TRUE)
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# imgui has no top-level CMakeLists.txt, so MakeAvailable populates it and stops;
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# the sources are added to the target below by name.
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FetchContent_MakeAvailable(imgui)
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if(NOT imgui_SOURCE_DIR OR NOT EXISTS "${imgui_SOURCE_DIR}/imgui.cpp")
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message(FATAL_ERROR
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"plot: the Dear ImGui sources for tag v1.91.9b are missing from "
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"'${imgui_SOURCE_DIR}'. The FetchContent clone failed, so PLOT_BUILD_IMGUI "
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"cannot link anything; either restore network access or pre-populate the "
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"source with -DFETCHCONTENT_SOURCE_DIR_IMGUI=<path>.")
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endif()
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add_library(imgui STATIC
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"${imgui_SOURCE_DIR}/imgui.cpp"
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"${imgui_SOURCE_DIR}/imgui_draw.cpp"
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"${imgui_SOURCE_DIR}/imgui_tables.cpp"
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"${imgui_SOURCE_DIR}/imgui_widgets.cpp"
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"${imgui_SOURCE_DIR}/backends/imgui_impl_glfw.cpp"
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"${imgui_SOURCE_DIR}/backends/imgui_impl_opengl3.cpp")
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# Both include roots are public: a consumer of the backends -- the adapter and
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# the example -- reaches them as <imgui.h> and <backends/imgui_impl_glfw.h>.
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target_include_directories(imgui PUBLIC
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"${imgui_SOURCE_DIR}"
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"${imgui_SOURCE_DIR}/backends")
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# imgui_impl_glfw.cpp needs GLFW; a build that also enables the GLFW adapter
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# gets the same target, never a second copy.
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plot_find_glfw(plot_imgui_glfw_dep)
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target_link_libraries(imgui PUBLIC ${plot_imgui_glfw_dep})
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target_compile_features(imgui PUBLIC cxx_std_20)
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add_library(plot_imgui STATIC imgui_plot.cpp)
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add_library(plot::imgui ALIAS plot_imgui)
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# The public include root is `adapters/`, so the header is reached as
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# <imgui/imgui_plot.hpp> -- the toolkit's name first, like every other adapter's.
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target_include_directories(plot_imgui PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/..")
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# ImGui stays PRIVATE: the adapter's header includes no ImGui header, so a
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# consumer of plot::imgui does not inherit the toolkit's headers.
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target_link_libraries(plot_imgui PUBLIC plot::core PRIVATE imgui ${plot_imgui_glfw_dep})
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plot_apply_warnings(plot_imgui)
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# Not installed and not exported, and not because of a discovery fallback: ImGui
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# is *always* fetched here, so there is no ImGui package for an installed config
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# file to find. Exporting plot::imgui would name the fetched `imgui` target in its
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# link interface and leave every consumer of `find_package(plot)` unable to
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# configure -- so plot::imgui is a build-tree target only, and a consumer that
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# wants it adds the adapter's source or fetches the same pinned tag itself.
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plot_record_adapter_export(plot_imgui FALSE
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"ImGui is supplied by FetchContent, so find_package(plot) cannot promise it to a consumer" "")
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