path: root/CMakeLists.txt

cmake_minimum_required(VERSION 3.13)
project(ProjectBrussel LANGUAGES C CXX)

find_package(cxxopts REQUIRED)
find_package(robin_hood REQUIRED)
find_package(frozen REQUIRED)
find_package(SQLite3 REQUIRED)
find_package(fmt REQUIRED)
find_package(pcg-cpp REQUIRED)
find_package(spdlog REQUIRED)
find_package(RapidJSON REQUIRED)
find_package(json-dto REQUIRED)
find_package(glad REQUIRED)
find_package(glm REQUIRED)
find_package(stb REQUIRED)

include(cmake/Exceptions.cmake)
include(cmake/RTTI.cmake)
include(cmake/Win32Subsystem.cmake)

find_package(OpenGL REQUIRED)
add_subdirectory(3rdparty/glfw)
add_subdirectory(3rdparty/imgui)
add_subdirectory(3rdparty/imguicolortextedit)
add_subdirectory(3rdparty/tracy)

# ==============================================================================
# Layer 10 (standalone, throw-into-the-buildsystem style)

file(GLOB_RECURSE 10-common_SOURCES
	source/10-common/*.c
	source/10-common/*.cpp
)
add_library(10-common OBJECT ${10-common_SOURCES})

set_target_properties(10-common PROPERTIES
	CXX_STANDARD 20
	CXX_STANDARD_REQUIRED ON
	CXX_EXTENSIONS OFF

	# Many files include platform headers, we don't want to leak them - it's just simpler to disable unity build for everything
	UNITY_BUILD OFF
)

target_include_directories(10-common PUBLIC source/10-common)
target_link_libraries(10-common PUBLIC
	# Conan external dependencies
	cxxopts::cxxopts
	robin_hood::robin_hood
	frozen::frozen
	SQLite::SQLite3
	fmt::fmt
	pcg-cpp::pcg-cpp
	spdlog::spdlog
	rapidjson
	json-dto::json-dto
	glad::glad
	glm::glm
	stb::stb
)

file(GLOB_RECURSE 10-editor-common_SOURCES
	source/10-editor-common/*.c
	source/10-editor-common/*.cpp
)
add_library(10-editor-common OBJECT ${10-editor-common_SOURCES})

set_target_properties(10-editor-common PROPERTIES
	CXX_STANDARD 20
	CXX_STANDARD_REQUIRED ON
	CXX_EXTENSIONS OFF
	UNITY_BUILD OFF
)

target_include_directories(10-editor-common PUBLIC source/10-editor-common)
target_link_libraries(10-editor-common PUBLIC
	# Vendored eternal dependencies
	imgui

	# Project internal components
	10-common
)

# ==============================================================================
# Layer 20 (building tools)

file(GLOB_RECURSE 20-codegen-runtime_SOURCES
	source/20-codegen-runtime/*.c
	source/20-codegen-runtime/*.cpp
)
add_library(20-codegen-runtime OBJECT ${20-codegen-runtime_SOURCES})

set_target_properties(20-codegen-runtime PROPERTIES
	CXX_STANDARD 20
	CXX_STANDARD_REQUIRED ON
	CXX_EXTENSIONS OFF
)

target_include_directories(20-codegen-runtime PUBLIC source/20-codegen-runtime)
target_link_libraries(20-codegen-runtime PUBLIC
	# Project internal components
	10-common
)

# NOTE: delibrately not recursive, because this target can contain non-source files with .cpp extensions in the folder
file(GLOB 20-codegen-compiler_SOURCES
	source/20-codegen-compiler/*.c
	source/20-codegen-compiler/*.cpp
)
add_executable(20-codegen-compiler ${20-codegen-compiler_SOURCES})

set_target_properties(20-codegen-compiler PROPERTIES	
	CXX_STANDARD 20
	CXX_STANDARD_REQUIRED ON
	CXX_EXTENSIONS OFF
)

target_link_libraries(20-codegen-compiler PRIVATE
	# Project internal components
	10-common
)

target_flag_exceptions(20-codegen-compiler ON)
target_flag_rtti(20-codegen-compiler OFF)

option(BRUSSEL_CODEGEN_DEBUG_PRINT "Enable debug printing in the code generator or not." OFF)
if(BRUSSEL_CODEGEN_DEBUG_PRINT)
	target_compile_definitions(20-codegen-compiler PRIVATE CODEGEN_DEBUG_PRINT=1)
endif()

# ==============================================================================
# Layer 30 (final products)

function(add_projectized_executable)
	# Add a library target
	#
	# Arguments
	#   TARGET_NAME
	#   TARGET_SOURCE_DIR
	#   EXTRA_SOURCES
	#   ENABLE_CODEGEN

	set(one_value_args TARGET_NAME TARGET_SOURCE_DIR ENABLE_CODEGEN)
	set(multi_value_args EXTRA_SOURCES)
	cmake_parse_arguments(arg "" "${one_value_args}" "${multi_value_args}" ${ARGN})

	file(GLOB_RECURSE var_HEADERS
		${arg_TARGET_SOURCE_DIR}/*.h
		${arg_TARGET_SOURCE_DIR}/*.hh
		${arg_TARGET_SOURCE_DIR}/*.hpp
	)
	file(GLOB_RECURSE var_SOURCES
		${arg_TARGET_SOURCE_DIR}/*.c
		${arg_TARGET_SOURCE_DIR}/*.cc
		${arg_TARGET_SOURCE_DIR}/*.cpp
	)
	add_executable(${arg_TARGET_NAME}
		${var_SOURCES}
		${arg_EXTRA_SOURCES}
	)

	set_target_properties(${arg_TARGET_NAME} PROPERTIES
		CXX_STANDARD 20
		CXX_STANDARD_REQUIRED ON
		CXX_EXTENSIONS OFF
	)

	if(arg_ENABLE_CODEGEN)
		set(var_OUTPUT_DIR ${CMAKE_BINARY_DIR}/generated/${arg_TARGET_NAME})
		target_include_directories(${arg_TARGET_NAME} PRIVATE ${var_OUTPUT_DIR})
		target_link_libraries(${arg_TARGET_NAME} PRIVATE 20-codegen-runtime)

		# https://stackoverflow.com/questions/70371064/run-custom-command-with-modified-files-as-arguments
		set(var_STAMPS "")
		set(var_STAMP_LIST ${var_OUTPUT_DIR}/stamplist.txt)
		set(var_GENERATED_FILE_LIST "")
		foreach(var_HEADER IN LISTS var_HEADERS)
			get_filename_component(var_HEADER_ABS "${var_HEADER}" ABSOLUTE)
			get_filename_component(var_HEADER_FILENAME "${var_HEADER}" NAME)
			get_filename_component(var_HEADER_STEM "${var_HEADER}" NAME_WLE)

			set(var_STAMP_FILE ${var_OUTPUT_DIR}/stamp/${var_HEADER_FILENAME})
			list(APPEND var_STAMPS ${var_STAMP_FILE})
			add_custom_command(
				OUTPUT ${var_STAMP_FILE}
				COMMAND "${CMAKE_COMMAND}" -E echo "${var_HEADER_ABS}" >> "${var_STAMP_LIST}"
				COMMAND "${CMAKE_COMMAND}" -E touch "${var_STAMP_FILE}"
				DEPENDS ${var_HEADER}
			)

			# Things that are included by other TUs
			set(var_OUTPUT_HEADERS
				${var_OUTPUT_DIR}/generated/${var_HEADER_STEM}.gh.inl
				${var_OUTPUT_DIR}/generated/${var_HEADER_STEM}.gs.inl
			)

			# Things that needs to be compiled
			# NOTE: we need at least one of this to make sure the target is rebuilt if the generated files changes
			set(var_OUTPUT_SOURCES
				${var_OUTPUT_DIR}/generated/${var_HEADER_STEM}.g.cpp
			)

			# Record the list of generated files, for the DEPENDS of the actual codegen executable invocation
			list(APPEND var_GENERATED_FILE_LIST ${var_OUTPUT_HEADERS} ${var_OUTPUT_SOURCES})
			# Add generated TUs to the target
			target_sources(${arg_TARGET_NAME} PRIVATE ${var_OUTPUT_SOURCES})
		endforeach()

		# NOTE: we prepend the target name to the custom targets to mangle them, prevent conflict between different projectized targets
		add_custom_target(${arg_TARGET_NAME}delete-stamp-list COMMAND "${CMAKE_COMMAND}" -E rm -f "${var_STAMP_LIST}")
		add_custom_target(${arg_TARGET_NAME}update-stamps DEPENDS ${var_STAMPS})
		add_dependencies(${arg_TARGET_NAME}update-stamps ${arg_TARGET_NAME}delete-stamp-list)
		
		# Actually generate the files, based on the list of changed files
		add_custom_command(
			OUTPUT ${var_GENERATED_FILE_LIST}
			COMMAND 20-codegen-compiler
				--output-dir=${var_OUTPUT_DIR}/generated
				--database=${var_OUTPUT_DIR}/model.sqlite3
				fileList:${var_STAMP_LIST}
			DEPENDS ${var_STAMPS} ${arg_TARGET_NAME}update-stamps
		)
	endif()
endfunction()

add_projectized_executable(
	TARGET_NAME 30-game
	TARGET_SOURCE_DIR source/30-game/
	ENABLE_CODEGEN ON
)

set_target_properties(30-game PROPERTIES
	UNITY_BUILD_MODE BATCH
	UNITY_BUILD_UNIQUE_ID "ProjectBrussel_UNITY_ID"
)

target_compile_definitions(30-game PRIVATE
	RAPIDJSON_HAS_STDSTRING=1
	IMGUI_DISABLE_OBSOLETE_FUNCTIONS
)

target_link_libraries(30-game PRIVATE
	# Vendored external dependencies
	OpenGL::GL
	glfw
	imgui
	ImGuiColorTextEdit
	tracy

	# Project internal components
	10-common
	10-editor-common
)

target_flag_exceptions(30-game ON)
target_flag_rtti(30-game ON)
target_use_windows_subsystem(30-game)

option(BRUSSEL_ENABLE_PROFILING "Whether profiling support is enabled or not." OFF)
if(BRUSSEL_ENABLE_PROFILING)
	target_compile_definitions(10-common
	PUBLIC
		TRACY_ENABLE
	)
endif()

option(BRUSSEL_ENABLE_DEV_ENV "Enable dev environment features or not." ON)
if(BRUSSEL_ENABLE_DEV_ENV)
	target_compile_definitions(10-common
	PUBLIC
		BRUSSEL_DEV_ENV=1
	)
endif()

option(BRUSSEL_ENABLE_EDITOR "Enable editor support or not." ON)
if(BRUSSEL_ENABLE_EDITOR)
	target_compile_definitions(10-common
	PUBLIC
		BRUSSEL_ENABLE_EDITOR=1
	)
endif()

option(BRUSSEL_ENABLE_ASAN "Enable AddressSanitizer or not." OFF)
if(BRUSSEL_ENABLE_ASAN)
	# Shared to all downstream targets
	target_compile_options(10-common
	PUBLIC
		-fsanitize=address
		-fno-omit-frame-pointer
	)
	target_link_options(10-common
	PUBLIC
		-fsanitize=address
		-fno-omit-frame-pointer
	)
endif()

option(BRUSSEL_ENABLE_UBSAN "Enable UndefinedBehaviorSanitizer or not." OFF)
if(BRUSSEL_ENABLE_UBSAN)
	# Shared to all downstream targets
	target_compile_options(10-common
	INTERFACE
		-fsanitize=undefined
	)
	target_link_options(10-common
	INTERFACE
		-fsanitize=undefined
	)
endif()