Added GLFW submodule as lib

Author: MarQMark

CMakeLists.txt

@@ -15,5 +15,29 @@ set(CMAKE_EXE_LINKER_FLAGS "-static-libgcc -static-libstdc++")
 
 add_compile_definitions(STB_IMAGE_IMPLEMENTATION)
 
+
+#           DOWNLOAD ALL THE SUBMODULES
+find_package(Git QUIET)
+if(GIT_FOUND AND EXISTS "${PROJECT_SOURCE_DIR}/.git")
+    # Update submodules as needed
+    option(GIT_SUBMODULE "Check submodules during build" ON)
+    if(GIT_SUBMODULE)
+        message(STATUS "Submodule update")
+        execute_process(COMMAND ${GIT_EXECUTABLE} submodule update --init --recursive
+                WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+                RESULT_VARIABLE GIT_SUBMOD_RESULT)
+        if(NOT GIT_SUBMOD_RESULT EQUAL "0")
+            message(FATAL_ERROR "git submodule update --init failed with ${GIT_SUBMOD_RESULT}, please checkout submodules")
+        endif()
+    endif()
+endif()
+
+#           CHECK ALL THE SUBMODULES
+if(NOT EXISTS "${PROJECT_SOURCE_DIR}/external/glfw/CMakeLists.txt")
+    message(FATAL_ERROR "The glfw submodules was not downloaded! GIT_SUBMODULE was turned off or failed. Please update submodules and try again.")
+endif()
+
+
+add_subdirectory(external/glfw)
 add_subdirectory("include")
 add_subdirectory("src")