Implement in-tree build

- Adds branches by checking CMAKE_SOURCE_DIR.
  - Avoids finding packages such as libobs and obs-frontend-api.
  - Does not create installer files.
- Replaces CMAKE_PROJECT_NAME with PROJECT_NAME.

CMakeLists.txt

@@ -11,64 +11,73 @@ set(MACOS_INSTALLER_UUID "D42A28A8-FCE7-45F4-901B-5F333C2ABC94")
 set(LINUX_MAINTAINER_EMAIL "[email protected]")
 # NOTE: Also edit ci/plugin.spec for RPM when creating a new plugin.
 
-find_package(libobs REQUIRED)
-find_package(obs-frontend-api REQUIRED)
-include(cmake/ObsPluginHelpers.cmake)
+if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
+	find_package(libobs REQUIRED)
+	find_package(obs-frontend-api REQUIRED)
+	include(cmake/ObsPluginHelpers.cmake)
+else()
+	add_library(OBS::obs-frontend-api ALIAS obs-frontend-api)
+endif()
 
 configure_file(
 	plugin-macros.h.in
 	plugin-macros.generated.h
 )
 
-configure_file(
-	installer/installer-Windows.iss.in
-	../installer/installer-Windows.generated.iss
-)
-
-configure_file(
-	ci/ci_includes.sh.in
-	../ci/ci_includes.generated.sh
-)
-configure_file(
-	ci/ci_includes.cmd.in
-	../ci/ci_includes.generated.cmd
-)
-
 set(PLUGIN_SOURCES
 	obs-command-source.c
 )
 
-add_library(${CMAKE_PROJECT_NAME} MODULE ${PLUGIN_SOURCES})
+add_library(${PROJECT_NAME} MODULE ${PLUGIN_SOURCES})
 
-target_link_libraries(${CMAKE_PROJECT_NAME}
+target_link_libraries(${PROJECT_NAME}
 	OBS::libobs
 	OBS::obs-frontend-api
 )
 
-target_include_directories(${CMAKE_PROJECT_NAME} PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
+target_include_directories(${PROJECT_NAME} PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
 
 if(OS_WINDOWS)
 	# Enable Multicore Builds and disable FH4 (to not depend on VCRUNTIME140_1.DLL when building with VS2019)
 	if (MSVC)
 		add_definitions(/MP /d2FH4-)
 	endif()
 
-	target_link_libraries(${CMAKE_PROJECT_NAME} OBS::w32-pthreads)
+	target_link_libraries(${PROJECT_NAME} OBS::w32-pthreads)
 endif()
 
 if(OS_LINUX)
-	target_compile_options(${CMAKE_PROJECT_NAME} PRIVATE -Wall -Wextra)
+	target_compile_options(${PROJECT_NAME} PRIVATE -Wall -Wextra)
 endif()
 
 if(APPLE)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++ -fvisibility=default")
 
-	set_target_properties(${CMAKE_PROJECT_NAME} PROPERTIES PREFIX "")
+	set_target_properties(${PROJECT_NAME} PROPERTIES PREFIX "")
 	set(MACOSX_PLUGIN_GUI_IDENTIFIER "${MACOS_BUNDLEID}")
 	set(MACOSX_PLUGIN_BUNDLE_VERSION "${CMAKE_PROJECT_VERSION}")
 	set(MACOSX_PLUGIN_SHORT_VERSION_STRING "1")
 endif()
 
-setup_plugin_target(${CMAKE_PROJECT_NAME})
-
-configure_file(installer/installer-macOS.pkgproj.in installer-macOS.generated.pkgproj)
+setup_plugin_target(${PROJECT_NAME})
+
+if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
+	configure_file(
+		installer/installer-Windows.iss.in
+		../installer/installer-Windows.generated.iss
+	)
+
+	configure_file(
+		ci/ci_includes.sh.in
+		../ci/ci_includes.generated.sh
+	)
+	configure_file(
+		ci/ci_includes.cmd.in
+		../ci/ci_includes.generated.cmd
+	)
+
+	configure_file(
+		installer/installer-macOS.pkgproj.in
+		installer-macOS.generated.pkgproj
+	)
+endif()