Made NBEngine installable + CMake restruct

CMakeLists.txt

@@ -7,6 +7,9 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
+include(GNUInstallDirs)
+include(CMakePackageConfigHelpers)
+
 function(toAbsolutePath SETVAR PATHS)
     set(PATHS ${PATHS} ${ARGN})
     set(RET_VAL "")
@@ -31,6 +34,7 @@ elseif(CMAKE_BUILD_TYPE STREQUAL "Debug")
     set(NB_LOGGING ON)
     set(NB_BUILD_TESTS ON)
     set(NB_BUILD_DOCS ON)
+    set(NBENGINE_INSTALL ON)
     add_compile_definitions(_NB_BUILD_DEBUG)
 endif()
 
@@ -55,7 +59,6 @@ if(NB_BUILD_TESTS)
         FetchContent_MakeAvailable(gtest)
     endif()
     set(GTEST_COLOR ON)
-    set(GLFW_BUILD_TESTS ON CACHE BOOL "" FORCE)
 endif()
 
 if (NB_LOGGING)
@@ -70,13 +73,7 @@ elseif (NB_TARGET_LINUX)
     add_compile_definitions(_NB_TARGET_LINUX)
 endif()
 
-# External Dep paths
-set(GLFW_PATH ../glfw/)
-set(GLAD_PATH ../glad/)
-set(STBIMAGE_PATH ../stbi_image)
-get_filename_component(GLFW_PATH ${GLFW_PATH} ABSOLUTE)
-get_filename_component(GLAD_PATH ${GLAD_PATH} ABSOLUTE)
-get_filename_component(STBIMAGE_PATH ${STBIMAGE_PATH} ABSOLUTE)
+get_filename_component(NBENGINE_ROOT ./ ABSOLUTE)
 
 add_subdirectory(./engine)
 
@@ -86,3 +83,23 @@ set(NB_REBUILD_DOCS)
 if (NB_BUILD_DOCS)
     add_subdirectory(./docs)
 endif()
+
+if (NBENGINE_INSTALL)
+    include(GNUInstallDirs)
+    include(CMakePackageConfigHelpers)
+    configure_package_config_file(
+        "NBEngineConfig.cmake.in"
+        "NBEngineConfig.cmake"
+        INSTALL_DESTINATION ${CMAKE_INSTALL_PREFIX}/cmake
+        PATH_VARS CMAKE_INSTALL_LIBDIR
+    )
+    write_basic_package_version_file(
+        "${CMAKE_CURRENT_BINARY_DIR}/NBEngineConfigVersion.cmake"
+        COMPATIBILITY AnyNewerVersion 
+    )
+    install(FILES
+        "${CMAKE_CURRENT_BINARY_DIR}/NBEngineConfig.cmake"
+        "${CMAKE_CURRENT_BINARY_DIR}/NBEngineConfigVersion.cmake"
+        DESTINATION "${CMAKE_INSTALL_PREFIX}/cmake"
+    )
+endif()