Adding Doxygen and CMake changes to support it

docs/CMakeLists.txt

@@ -0,0 +1,32 @@
+find_package(Doxygen)
+if (NOT DOXYGEN_FOUND)
+    message(FATAL_ERROR "Doxygen could not be sourced.")
+    return()
+endif()
+
+include(FetchContent)
+FetchContent_Declare(
+    doxygen-awesome-css
+    URL https://github.com/jothepro/doxygen-awesome-css/archive/refs/heads/main.zip
+)
+FetchContent_MakeAvailable(doxygen-awesome-css)
+FetchContent_GetProperties(doxygen-awesome-css SOURCE_DIR AWESOME_CSS_DIR)
+
+set(DOXYGEN_GENERATE_HTML YES)
+set(DOXYGEN_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/docs)
+set(DOXYGEN_HTML_EXTRA_STYLESHEET ${AWESOME_CSS_DIR}/doxygen-awesome.css)
+
+if(ENVNB_SOURCE_FOUND)
+    message("Using file timestamps...")
+    doxygen_add_docs(NBEngineDocumentation
+        ${NB_CORE_SOURCE} ALL
+        USE_STAMP_FILE
+        COMMENT "Building documentation"
+    )
+else()
+    message("Processing all files...")
+    doxygen_add_docs(NBEngineDocumentation
+        ${PROJECT_SOURCE_DIR}/engine ALL
+        COMMENT "Building documentation"
+    )
+endif()

engine/CMakeLists.txt

@@ -1,3 +1,11 @@
 add_subdirectory(./NBCore)
 add_subdirectory(./NBEvents)
-add_subdirectory(./NBGraphics)
+add_subdirectory(./NBGraphics)
+
+if (ENVNB_CORE_SOURCE OR ENVNB_EVENTS_SOURCE OR ENVNB_GRAPHICS_SOURCE)
+    set(ENVNB_SOURCE_FOUND ON)
+endif()
+
+if (ENVNB_CORE_INCLUDE OR ENVNB_EVENTS_INCLUDE OR ENVNB_GRAPHICS_INCLUDE)
+    set(ENVNB_INCLUDE_FOUND ON)
+endif()

engine/NBCore/CMakeLists.txt

@@ -1,11 +1,27 @@
 include_directories(./.)
 
-add_library(NBCore
+set(NB_CORE_SOURCE
     ./src/Errors.cpp
     ./src/Processes.cpp
     ./src/Logger.cpp
 )
 
+set(NB_CORE_INCLUDE
+    ANSITerm.hpp
+    DataSink.hpp
+    Errors.hpp
+    Logger.hpp
+    Processes.hpp
+    ThreadsafeQueue.hpp
+    Types.hpp
+    TypeTraits.hpp
+)
+
+toAbsolutePath(ENVNB_CORE_SOURCE ${NB_CORE_SOURCE})
+toAbsolutePath(ENVNB_CORE_INCLUDE ${NB_CORE_INCLUDE})
+
+add_library(NBCore  ${NB_CORE_SOURCE})
+
 if (NB_BUILD_TESTS)
     add_subdirectory(./tests)
 endif()

engine/NBEvents/CMakeLists.txt

@@ -1,5 +1,16 @@
 include_directories(./.)
 
-add_library(NBEvents 
+set(NB_EVENTS_SOURCE
     ./src/Events.cpp
+)
+
+set(NB_EVENTS_INCLUDE
+    ./Events.hpp
+)
+
+toAbsolutePath(ENVNB_EVENTS_SOURCE ${NB_EVENTS_SOURCE})
+toAbsolutePath(ENVNB_EVENTS_INCLUDE ${NB_EVENTS_INCLUDE})
+
+add_library(NBEvents 
+    ${NB_EVENTS_SOURCE}
 )

engine/NBGraphics/CMakeLists.txt

@@ -10,9 +10,26 @@ set(GLFW_BUILD_DOCS OFF CACHE BOOL "" FORCE)
 set(GLFW_BUILD_TESTS OFF CACHE BOOL "" FORCE)
 set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
 
-add_library(NBGraphics 
+set(NB_GRAPHICS_SOURCE
     ./src/Window.cpp
     ./src/Buffers.cpp
+)
+
+set(NB_GRAPHICS_INCLUDE
+    ./Buffers.hpp
+    ./Camera.hpp
+    ./Draw.hpp
+    ./GLLoad.hpp
+    ./shader.hpp
+    ./VAOManager.hpp
+    ./Window.hpp
+)
+
+toAbsolutePath(ENVNB_GRAPHICS_SOURCE ${NB_GRAPHICS_SOURCE})
+toAbsolutePath(ENVNB_GRAPHICS_INCLUDE ${NB_GRAPHICS_INCLUDE})
+
+add_library(NBGraphics 
+    ${NB_GRAPHICS_SOURCE}
     ${GLAD_PATH}/src/glad.c
 )
 target_link_libraries(NBGraphics glfw3)