option(BUILD_SHARED_LIBS "Build shared library" TRUE)

# Compiler flags

add_definitions(-DIRRLICHT_EXPORTS)
if(NOT BUILD_SHARED_LIBS)
	add_definitions(-D_IRR_STATIC_LIB_)
endif()
if(CMAKE_BUILD_TYPE STREQUAL "Debug")
	add_definitions(-D_DEBUG)
endif()
set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

if(CMAKE_CXX_COMPILER_ID MATCHES "^(GNU|Clang|AppleClang)$")
	set(CMAKE_CXX_FLAGS_RELEASE "-O3")
	set(CMAKE_CXX_FLAGS_DEBUG "-g")

	add_compile_options(-Wall -pipe -fno-exceptions -fno-rtti)

	# Enable SSE for floating point math on 32-bit x86 by default
	# reasoning see minetest issue #11810 and https://gcc.gnu.org/wiki/FloatingPointMath
	if(CMAKE_SIZEOF_VOID_P EQUAL 4)
		include(CheckCXXSourceCompiles)
		check_cxx_source_compiles("#ifndef __i686__\n#error\n#endif\nint main(){}" IS_I686)
		if(IS_I686)
			message(STATUS "Detected Intel x86: using SSE instead of x87 FPU")
			add_compile_options(-mfpmath=sse -msse)
		endif()
	endif()

elseif(MSVC)
	string(APPEND CMAKE_CXX_STANDARD_LIBRARIES " msvcrt.lib") # ???? fuck off

	add_compile_options(/GR- /Zl)

	# Enable SSE for floating point math on 32-bit x86 by default
	# reasoning see minetest issue #11810 and https://gcc.gnu.org/wiki/FloatingPointMath
	if(CMAKE_SIZEOF_VOID_P EQUAL 4)
		add_compile_options(/arch:SSE)
	endif()
endif()

# Required libs

find_package(ZLIB REQUIRED)
find_package(JPEG REQUIRED)
find_package(PNG REQUIRED)

# To configure the features available in this Irrlicht build please edit
# include/IrrCompileConfig.h and re-run CMake from a clean state
include(CheckSymbolExists)
set(CMAKE_REQUIRED_INCLUDES ${PROJECT_SOURCE_DIR}/include)
unset(OGLES1_ENABLED CACHE)
unset(OGLES2_ENABLED CACHE)
unset(OGL_ENABLED CACHE)
unset(XINPUT2_ENABLED CACHE)

check_symbol_exists(_IRR_COMPILE_WITH_OGLES1_ "IrrCompileConfig.h" OGLES1_ENABLED)
if(OGLES1_ENABLED)
	# only tested on Android, probably works on Linux (is this needed anywhere else?)
	find_library(OPENGLES_LIBRARY NAMES GLESv1_CM REQUIRED)
	find_library(EGL_LIBRARY NAMES EGL REQUIRED)

	message(STATUS "Found OpenGLES: ${OPENGLES_LIBRARY}")
endif()
check_symbol_exists(_IRR_COMPILE_WITH_OGLES2_ "IrrCompileConfig.h" OGLES2_ENABLED)
if(OGLES2_ENABLED)
	find_package(OpenGLES2 REQUIRED)
endif()
check_symbol_exists(_IRR_COMPILE_WITH_OPENGL_ "IrrCompileConfig.h" OGL_ENABLED)
if(OGL_ENABLED)
	set(OpenGL_GL_PREFERENCE "LEGACY")
	find_package(OpenGL REQUIRED)
endif()
check_symbol_exists(_IRR_LINUX_X11_XINPUT2_ "IrrCompileConfig.h" XINPUT2_ENABLED)
if(XINPUT2_ENABLED)
	find_library(XINPUT_LIBRARY Xi REQUIRED)
endif()

# Platform-specific libs

if(ANDROID)
	enable_language(C)
	add_library(native_app_glue STATIC ${ANDROID_NDK}/sources/android/native_app_glue/android_native_app_glue.c)
elseif(APPLE)
	find_library(COCOA_LIB Cocoa REQUIRED)
	find_library(IOKIT_LIB IOKit REQUIRED)

	add_definitions(-DGL_SILENCE_DEPRECATION)
else()
	# Unix probably
	find_package(X11 REQUIRED)
endif()

set(link_includes
	"${PROJECT_SOURCE_DIR}/include"
	"${CMAKE_CURRENT_SOURCE_DIR}"

	"${ZLIB_INCLUDE_DIR}"
	"${JPEG_INCLUDE_DIR}"
	"${PNG_INCLUDE_DIR}"

	${OPENGL_INCLUDE_DIR}
	${OPENGLES2_INCLUDE_DIR}
	${EGL_INCLUDE_DIR}

	"$<$<PLATFORM_ID:Android>:${ANDROID_NDK}/sources/android/native_app_glue>"
	${X11_INCLUDE_DIR}
)

set(link_libs
	"${ZLIB_LIBRARY}"
	"${JPEG_LIBRARY}"
	"${PNG_LIBRARY}"

	${OPENGL_LIBRARIES}
	${OPENGLES_LIBRARY}
	${OPENGLES2_LIBRARIES}
	${EGL_LIBRARY}
	${XINPUT_LIBRARY}

	"$<$<PLATFORM_ID:Android>:native_app_glue -landroid -llog>"
	${COCOA_LIB}
	${IOKIT_LIB}
	"$<$<PLATFORM_ID:Windows>:gdi32>"
	"$<$<PLATFORM_ID:Windows>:winmm>"
	${X11_X11_LIB}
	${X11_Xxf86vm_LIB}
)

# Source files

set(IRRMESHLOADER
	CB3DMeshFileLoader.cpp
	COBJMeshFileLoader.cpp
	CXMeshFileLoader.cpp
)

add_library(IRRMESHOBJ OBJECT
	CSkinnedMesh.cpp
	CBoneSceneNode.cpp
	CMeshSceneNode.cpp
	CAnimatedMeshSceneNode.cpp
	${IRRMESHLOADER}
)

add_library(IRROBJ OBJECT
	CBillboardSceneNode.cpp
	CCameraSceneNode.cpp
	CDummyTransformationSceneNode.cpp
	CEmptySceneNode.cpp
	CMeshManipulator.cpp
	CSceneCollisionManager.cpp
	CSceneManager.cpp
	CMeshCache.cpp
	CDefaultSceneNodeFactory.cpp
)

set(IRRDRVROBJ
	CNullDriver.cpp
	COpenGLCacheHandler.cpp
	COpenGLDriver.cpp
	COpenGLShaderMaterialRenderer.cpp
	COpenGLSLMaterialRenderer.cpp
	COpenGLExtensionHandler.cpp
	COGLESDriver.cpp
	COGLESExtensionHandler.cpp
	COGLES2Driver.cpp
	COGLES2ExtensionHandler.cpp
	COGLES2FixedPipelineRenderer.cpp
	COGLES2MaterialRenderer.cpp
	COGLES2Renderer2D.cpp
	CWebGL1Driver.cpp
	CGLXManager.cpp
	CWGLManager.cpp
	CEGLManager.cpp
	mt_opengl_loader.cpp
)

set(IRRIMAGEOBJ
	CColorConverter.cpp
	CImage.cpp
	CImageLoaderBMP.cpp
	CImageLoaderJPG.cpp
	CImageLoaderPNG.cpp
	CImageLoaderTGA.cpp
	CImageWriterJPG.cpp
	CImageWriterPNG.cpp
)

add_library(IRRVIDEOOBJ OBJECT
	CVideoModeList.cpp
	CFPSCounter.cpp
	${IRRDRVROBJ}
	${IRRIMAGEOBJ}
)

add_library(IRRIOOBJ OBJECT
	CFileList.cpp
	CFileSystem.cpp
	CLimitReadFile.cpp
	CMemoryFile.cpp
	CReadFile.cpp
	CWriteFile.cpp
	CZipReader.cpp
	CMountPointReader.cpp
	CAttributes.cpp
)

add_library(IRROTHEROBJ OBJECT
	CIrrDeviceSDL.cpp
	CIrrDeviceLinux.cpp
	CIrrDeviceConsole.cpp
	CIrrDeviceStub.cpp
	CIrrDeviceWin32.cpp
	CIrrDeviceFB.cpp
	CLogger.cpp
	COSOperator.cpp
	Irrlicht.cpp
	os.cpp
	leakHunter.cpp
	CProfiler.cpp
)

if(ANDROID)
	target_sources(IRROTHEROBJ PRIVATE
		Android/CIrrDeviceAndroid.cpp
		Android/CAndroidAssetReader.cpp
		Android/CAndroidAssetFileArchive.cpp
		Android/CKeyEventWrapper.cpp
	)
elseif(APPLE)
	# Build all IRROTHEROBJ sources as objc++, including the .cpp's
	set_target_properties(IRROTHEROBJ PROPERTIES COMPILE_OPTIONS "-xobjective-c++")
	target_sources(IRROTHEROBJ PRIVATE
		CIrrDeviceOSX.mm
		CNSOGLManager.mm
	)
endif()

add_library(IRRGUIOBJ OBJECT
	CGUIButton.cpp
	CGUICheckBox.cpp
	CGUIComboBox.cpp
	CGUIContextMenu.cpp
	CGUIEditBox.cpp
	CGUIEnvironment.cpp
	CGUIFileOpenDialog.cpp
	CGUIFont.cpp
	CGUIImage.cpp
	CGUIInOutFader.cpp
	CGUIListBox.cpp
	CGUIMenu.cpp
	CGUIMeshViewer.cpp
	CGUIMessageBox.cpp
	CGUIModalScreen.cpp
	CGUIScrollBar.cpp
	CGUISpinBox.cpp
	CGUISkin.cpp
	CGUIStaticText.cpp
	CGUITabControl.cpp
	CGUITable.cpp
	CGUIToolBar.cpp
	CGUIWindow.cpp
	CGUIColorSelectDialog.cpp
	CDefaultGUIElementFactory.cpp
	CGUISpriteBank.cpp
	CGUIImageList.cpp
	CGUITreeView.cpp
	CGUIProfiler.cpp
)

# Library

add_library(IrrlichtMt)
foreach(object_lib
	IRRMESHOBJ IRROBJ IRRVIDEOOBJ
	IRRIOOBJ IRROTHEROBJ IRRGUIOBJ)
	# Set include directories for object library compilation
	target_include_directories(${object_lib} PRIVATE ${link_includes})
	# Add objects from object library to main library
	target_sources(IrrlichtMt PRIVATE $<TARGET_OBJECTS:${object_lib}>)
endforeach()

# Alias target provides add_submodule compatibility
add_library(IrrlichtMt::IrrlichtMt ALIAS IrrlichtMt)

target_include_directories(IrrlichtMt
	PUBLIC
		"$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include/>"
		"$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>"
		"$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/irrlichtmt>"
	PRIVATE
		${link_includes}
)

target_link_libraries(IrrlichtMt PRIVATE ${link_libs})

# Propagate static library flag to lib users, only needed for Windows
if(NOT BUILD_SHARED_LIBS)
	target_compile_definitions(IrrlichtMt INTERFACE _IRR_STATIC_LIB_)
endif()

set_target_properties(IrrlichtMt PROPERTIES
	VERSION ${PROJECT_VERSION}
	SOVERSION ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
)

if(WIN32)
	set_target_properties(IrrlichtMt PROPERTIES PREFIX "") # for DLL name
endif()

# Installation of library
if(ANDROID)
	set(INSTALL_TARGETS IrrlichtMt native_app_glue)
else()
	set(INSTALL_TARGETS IrrlichtMt)
endif()

install(TARGETS ${INSTALL_TARGETS}
	EXPORT IrrlichtMt-export
	DESTINATION "${CMAKE_INSTALL_LIBDIR}"
)