Patch submitted upstream: https://github.com/OpenBoardView/OpenBoardView/pull/233
diff --git a/CMakeModules/FindImGui.cmake b/CMakeModules/FindImGui.cmake
new file mode 100644
index 0000000..4d1fa42
--- /dev/null
+++ b/CMakeModules/FindImGui.cmake
@@ -0,0 +1,36 @@
+# Copyright (C) 2018, 2022 Maxim Cournoyer
+# Redistribution and use of this file is allowed according to the terms of the MIT license.
+# For details see the LICENSE file distributed with OpenBoardView.
+# Note:
+# Searching headers and libraries is very simple and is NOT as powerful as scripts
+# distributed with CMake, because LuaDist defines directories to search for.
+# Everyone is encouraged to contact the author with improvements. Maybe this file
+# becomes part of CMake distribution sometimes.
+
+# - Find ImGui
+# Find the native imgui headers and libraries.
+#
+# IMGUI_INCLUDE_DIRS - where to find imgui/imgui.h, etc.
+# IMGUI_LIBRARIES - List of libraries when using imgui.
+# IMGUI_FOUND - True if imgui is found.
+
+# Look for the header file.
+FIND_PATH(IMGUI_INCLUDE_DIR NAMES imgui.h PATH_SUFFIXES imgui)
+
+# Look for the library.
+FIND_LIBRARY(IMGUI_LIBRARY NAMES ImGui imgui)
+
+# Handle the QUIETLY and REQUIRED arguments and set IMGUI_FOUND to TRUE if all listed variables are TRUE.
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(ImGui DEFAULT_MSG IMGUI_LIBRARY IMGUI_INCLUDE_DIR)
+
+# Copy the results to the output variables.
+IF(IMGUI_FOUND)
+ SET(IMGUI_LIBRARIES ${IMGUI_LIBRARY})
+ SET(IMGUI_INCLUDE_DIRS ${IMGUI_INCLUDE_DIR})
+ELSE()
+ SET(IMGUI_LIBRARIES)
+ SET(IMGUI_INCLUDE_DIRS)
+ENDIF()
+
+MARK_AS_ADVANCED(IMGUI_INCLUDE_DIRS IMGUI_LIBRARIES)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 301f933..24bf263 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -76,28 +76,30 @@ endif()
# note: in the future there may be integrated CMake support into imgui
# see: https://github.com/ocornut/imgui/pull/1713
# for now do it manually, after glad and SDL2 because we use the includes for the sdl_opengl examples
-execute_process(
+find_package(ImGui) # search ImGui from system
+if(NOT IMGUI_FOUND) # else fallback to bundled copy
+ execute_process(
COMMAND git submodule update --init src/imgui
- WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
-)
-add_definitions("-DImDrawIdx=unsigned int") # short is not enough for us
-add_definitions("-DIMGUI_IMPL_OPENGL_LOADER_GLAD") # We use glad
-# Configure GL3 renderer to be GLES2 compatible if GLES2 is enabled
-if(ENABLE_GLES2)
- add_definitions("-DIMGUI_IMPL_OPENGL_ES2")
-endif()
-
-# workaround for OpenGL include for OpenGL2, need to be glad rather than gl itself
-file(READ "${CMAKE_CURRENT_SOURCE_DIR}/imgui/backends/imgui_impl_opengl2.cpp" input)
-string(REPLACE "OpenGL/gl.h" "glad/glad.h" input "${input}")
-string(REPLACE "GL/gl.h" "glad/glad.h" input "${input}")
-file(WRITE "${CMAKE_CURRENT_SOURCE_DIR}/imgui/backends/imgui_impl_opengl2.cpp" "${input}")
-
-include_directories(${CMAKE_CURRENT_SOURCE_DIR}/imgui
- ${GLAD_INCLUDE_DIRS}
-)
-
-set(SOURCES
+ WORKING_DIRECTORY ${PROJECT_SOURCE_DIR})
+ add_definitions("-DImDrawIdx=unsigned int") # short is not enough for us
+ add_definitions("-DIMGUI_IMPL_OPENGL_LOADER_GLAD") # We use glad
+ # Configure GL3 renderer to be GLES2 compatible if GLES2 is enabled
+ if(ENABLE_GLES2)
+ add_definitions("-DIMGUI_IMPL_OPENGL_ES2")
+ endif()
+
+ # workaround for OpenGL include for OpenGL2, need to be glad rather than gl itself
+ file(READ "${CMAKE_CURRENT_SOURCE_DIR}/imgui/backends/imgui_impl_opengl2.cpp" input)
+ string(REPLACE "OpenGL/gl.h" "glad/glad.h" input "${input}")
+ string(REPLACE "GL/gl.h" "glad/glad.h" input "${input}")
+ file(WRITE "${CMAKE_CURRENT_SOURCE_DIR}/imgui/backends/imgui_impl_opengl2.cpp" "${input}")
+
+ set(IMGUI_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/imgui
+ ${CMAKE_CURRENT_SOURCE_DIR}/imgui/examples)
+
+ set(IMGUI_LIBRARIES imgui)
+
+ set(SOURCES
imgui/imgui.cpp
imgui/imgui_draw.cpp
imgui/imgui_tables.cpp
@@ -106,33 +108,35 @@ set(SOURCES
imgui/backends/imgui_impl_sdl.cpp)
-if(ENABLE_GL1)
+ if(ENABLE_GL1)
LIST(APPEND SOURCES
- imgui/backends/imgui_impl_opengl2.cpp
- )
-endif()
-if(ENABLE_GL3)
+ imgui/backends/imgui_impl_opengl2.cpp
+ )
+ endif()
+ if(ENABLE_GL3)
LIST(APPEND SOURCES
- imgui/backends/imgui_impl_opengl3.cpp
- )
-endif()
+ imgui/backends/imgui_impl_opengl3.cpp
+ )
+ endif()
-add_library(imgui STATIC ${SOURCES})
-target_link_libraries(imgui
+ add_library(imgui STATIC ${SOURCES})
+ target_link_libraries(imgui
${GLAD_LIBRARIES}
-)
-if(MINGW)
-target_link_libraries(imgui
- SDL2::SDL2-static
-)
-else()
-target_link_libraries(imgui
- SDL2::SDL2
-)
+ )
+ if(MINGW)
+ target_link_libraries(imgui
+ SDL2::SDL2-static
+ )
+ else()
+ target_link_libraries(imgui
+ SDL2::SDL2
+ )
+ endif()
endif()
-set(IMGUI_INCLUDE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/imgui ${CMAKE_CURRENT_SOURCE_DIR}/imgui/examples)
-
+include_directories(
+ ${IMGUI_INCLUDE_DIRS}
+ ${GLAD_INCLUDE_DIRS})
#install(TARGETS imgui DESTINATION ${INSTALL_ARCHIVE_DIR}) # No need to install a static lib
diff --git a/src/openboardview/CMakeLists.txt b/src/openboardview/CMakeLists.txt
index d049ef9..bb56f70 100644
--- a/src/openboardview/CMakeLists.txt
+++ b/src/openboardview/CMakeLists.txt
@@ -129,7 +129,7 @@ elseif(APPLE)
endif()
target_link_libraries(${PROJECT_NAME_LOWER}
- imgui
+ ${IMGUI_LIBRARIES}
SQLite::SQLite3
${GLAD_LIBRARIES}
${COCOA_LIBRARY}
