xo-alloc: + gc history xo-imgui: gui examples

xo-imgui/example/ex2/CMakeLists.txt

@@ -0,0 +1,62 @@
+if (XO_ENABLE_EXAMPLES)
+    # imgui dependency
+
+    find_path(IMGUI_INCLUDE_DIR
+        NAMES imgui/imgui.h
+        DOC "path to imgui header"
+    )
+    if (IMGUI_INCLUDE_DIR)
+        message(STATUS "found imgui/imgui.h in IMGUI_INCLUDE_DIR=[${IMGUI_INCLUDE_DIR}]")
+    else()
+        message(FATAL_ERROR "unable to find imgui.h")
+    endif()
+
+    # target executable
+
+    set(SELF_EXE imgui_ex2)
+    add_executable(${SELF_EXE} imgui_ex2.cpp
+        ${IMGUI_INCLUDE_DIR}/imgui/imgui.cpp
+        ${IMGUI_INCLUDE_DIR}/imgui/imgui_demo.cpp
+        ${IMGUI_INCLUDE_DIR}/imgui/imgui_draw.cpp
+        ${IMGUI_INCLUDE_DIR}/imgui/imgui_widgets.cpp
+        ${IMGUI_INCLUDE_DIR}/imgui/imgui_tables.cpp
+        ${IMGUI_INCLUDE_DIR}/imgui/backends/imgui_impl_sdl2.cpp
+        ${IMGUI_INCLUDE_DIR}/imgui/backends/imgui_impl_opengl3.cpp
+    )
+    xo_include_options2(${SELF_EXE})
+
+    # OpenGL dependency
+
+    # have to choose between
+    #   libGL.so
+    # or
+    #   libOpenGL.so + libGLX.so    # GLVND = OpenGL Vendor Neutral Dispatch (e.g. mesa|nvda)
+    #
+    # expect in .build/CMakeCache.txt:
+    #   OPENGL_opengl_LIBRARY:FILEPATH=/path/to/libOpenGL.so
+    #   OpenGL_DIR:PATH=OpenGL_DIR-NOTFOUND  # no cmake config file
+
+    set(OpenGL_GL_PREFERENCE GLVND)  # or LEGACY
+    find_package(OpenGL REQUIRED)  # find_package(OpenGL CONFIG REQUIRE) won't work
+
+    target_link_libraries(${SELF_EXE} PUBLIC OpenGL::GL)
+
+    # GLEW dependency
+    xo_external_pkgconfig_dependency(${SELF_EXE} GLEW glew)
+
+    # GLFW dependency
+#    find_package(glfw3 CONFIG REQUIRED)
+#    target_link_libraries(${SELF_EXE} PUBLIC glfw) # want -lglfw
+
+    # SDL2 dependency
+    xo_external_pkgconfig_dependency(${SELF_EXE} SDL2 sdl2)
+
+    # would prefer to use just IMGUI_INCLUDE_DIR,
+    # but imgui/backends/ .h files don't quote the imgui/ stem
+    #
+    target_include_directories(${SELF_EXE} PUBLIC ${IMGUI_INCLUDE_DIR}/imgui)
+
+    xo_dependency(${SELF_EXE} xo_object)
+    xo_dependency(${SELF_EXE} randomgen)
+    xo_dependency(${SELF_EXE} xo_alloc)
+endif()