refactor(close #17): Classify engine files

CMakeLists.txt

@@ -1,3 +1,4 @@
+# Set minimum CMake version
 cmake_minimum_required(VERSION 3.22)
 
 # Declare project

engine/CMakeLists.txt

@@ -1,19 +1,45 @@
+# Set minimum CMake version
+cmake_minimum_required(VERSION 3.22)
+
+# Declare project
 project(engine)
 
-set(ENGINE_SOURCE_DIR src)
-set(ENGINE_INCLUDE_DIR include)
+# Define variables of source files and include directories
+set(CORE_INCLUDES core)
+set(INPUT_INCLUDES core/input)
+file(GLOB_RECURSE CORE_SOURCES "${CORE_INCLUDES}/*.cpp")
+file(GLOB_RECURSE INPUT_SOURCES "${INPUT_INCLUDES}/*.cpp")
 
-file(GLOB_RECURSE ENGINE_SOURCES ${ENGINE_SOURCE_DIR}/*.cpp)
+set(RENDERING_INCLUDES rendering)
+file(GLOB_RECURSE RENDERING_SOURCES "${RENDERING_INCLUDES}/*.cpp")
 
+set(SCENE_INCLUDES scene)
+set(COMPONENTS_INCLUDES scene/components)
+file(GLOB SCENE_SOURCES "${SCENE_INCLUDES}/*.cpp")
+file(GLOB COMPONENTS_SOURCES "${COMPONENTS_INCLUDES}/*.cpp")
+
+set(UI_INCLUDES ui)
+file(GLOB UI_SOURCES "${UI_INCLUDES}/*.cpp")
+
+# Build engine as library
 add_library(${PROJECT_NAME})
 
+# Add resources folder
 if(CMAKE_BUILD_TYPE STREQUAL "Release")
     target_compile_definitions(${PROJECT_NAME} PUBLIC RESOURCES_PATH="./resources/")
 else()
     target_compile_definitions(${PROJECT_NAME} PUBLIC RESOURCES_PATH="${CMAKE_SOURCE_DIR}/editor/resources/")
 endif()
 
-target_sources(${PROJECT_NAME} PRIVATE ${ENGINE_SOURCES})
-target_include_directories(${PROJECT_NAME} PUBLIC ${ENGINE_INCLUDE_DIR})
-
+# Link sources, include directories, and third party libraries
+target_include_directories(${PROJECT_NAME} PUBLIC
+        ${CORE_INCLUDES} ${INPUT_INCLUDES}
+        ${RENDERING_INCLUDES}
+        ${SCENE_INCLUDES} ${COMPONENTS_INCLUDES}
+        ${UI_INCLUDES})
+target_sources(${PROJECT_NAME} PRIVATE
+        ${CORE_SOURCES} ${INPUT_SOURCES}
+        ${RENDERING_SOURCES}
+        ${SCENE_SOURCES} ${COMPONENTS_SOURCES}
+        ${UI_SOURCES})
 target_link_libraries(${PROJECT_NAME} glfw glad glm imgui stb)