feat: engine as library

engine/CMakeLists.txt

@@ -0,0 +1,89 @@
+add_library(${ENGINE_TARGET} STATIC
+  src/IO/parser.cpp
+  src/IO/file_manager.cpp
+
+  src/window/window.cpp
+
+  src/components/batch.cpp
+
+  src/renderer/debug.cpp
+  src/renderer/mesh.cpp
+  src/renderer/shader.cpp
+  src/renderer/texture.cpp
+  src/renderer/wavefront.cpp
+  src/renderer/engine.cpp
+  src/renderer/renderer.cpp
+
+  src/main.cpp
+)
+
+set_target_properties(${ENGINE_TARGET} PROPERTIES
+  CXX_STANDARD 17
+  CXX_STANDARD_REQUIRED ON
+  CXX_VISIBILITY_PRESET hidden
+  VISIBILITY_INLINES_HIDDEN YES
+)
+
+target_include_directories(${ENGINE_TARGET} PUBLIC
+  ${CMAKE_CURRENT_SOURCE_DIR}/include
+  ${CMAKE_CURRENT_SOURCE_DIR}/contrib
+)
+target_link_libraries(${ENGINE_TARGET} PUBLIC
+  SDL3::SDL3
+  OpenGL::GL
+  GLEW::GLEW
+  glm::glm
+  EnTT::EnTT
+)
+
+if (MSVC)
+  target_compile_options(${ENGINE_TARGET} PRIVATE $<$<CONFIG:Debug>:/Zi>)
+  target_link_options(${ENGINE_TARGET}    PRIVATE $<$<CONFIG:Debug>:/DEBUG:FULL>)
+else()
+  target_compile_options(${ENGINE_TARGET} PRIVATE $<$<CONFIG:Debug>:-ggdb>)
+endif()
+
+# Release flags
+if (MSVC)
+  # /O2: optimize speed, /GL: whole program opt (LTCG), /DNDEBUG: disable asserts
+  target_compile_options(${ENGINE_TARGET} PRIVATE
+    $<$<CONFIG:Release>:/O2>
+    $<$<CONFIG:Release>:/DNDEBUG>
+    $<$<CONFIG:RelWithDebInfo>:/O2>
+  )
+  # Link-time codegen & extra linker opts for smaller/faster binaries
+  target_link_options(${ENGINE_TARGET} PRIVATE
+    $<$<CONFIG:Release>:/LTCG /OPT:ICF /OPT:REF>
+    $<$<CONFIG:RelWithDebInfo>:/LTCG /OPT:ICF /OPT:REF>
+  )
+else()
+  # GCC/Clang
+  # -O3 for max opts, -ffast-math optional but can be risky; we keep it OFF by default.
+  option(CODINGGAME_USE_MARCH_NATIVE "Enable -march=native on Release for this machine" ON)
+  target_compile_options(${ENGINE_TARGET} PRIVATE
+    $<$<CONFIG:Release>:-O3>
+    $<$<AND:$<CONFIG:Release>,$<BOOL:${CODINGGAME_USE_MARCH_NATIVE}>>:-march=native>
+    $<$<CONFIG:Release>:-DNDEBUG>
+    $<$<CONFIG:RelWithDebInfo>:-O3 -g>
+  )
+  # Linker: enable LTO when available; optionally strip symbols on non-Apple
+  include(CheckIPOSupported)  # IPO == LTO in CMake terms
+  check_ipo_supported(RESULT ipo_supported OUTPUT ipo_msg)
+  if(ipo_supported)
+    set_property(TARGET ${ENGINE_TARGET} PROPERTY INTERPROCEDURAL_OPTIMIZATION_RELEASE TRUE)
+    set_property(TARGET ${ENGINE_TARGET} PROPERTY INTERPROCEDURAL_OPTIMIZATION_RELWITHDEBINFO TRUE)
+  endif()
+
+  if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND NOT APPLE)
+    # -s strips symbols at link stage (use only for pure Release)
+    target_link_options(${ENGINE_TARGET} PRIVATE $<$<CONFIG:Release>:-s>)
+  endif()
+endif()
+
+# ---------- Windows: copy runtime DLLs ----------
+if (WIN32)
+  add_custom_command(TARGET ${ENGINE_TARGET} POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different
+      $<TARGET_RUNTIME_DLLS:${ENGINE_TARGET}> $<TARGET_FILE_DIR:${ENGINE_TARGET}>
+    COMMAND_EXPAND_LISTS)
+endif()