CMakeLists.txt

cmake_minimum_required(VERSION 3.2 FATAL_ERROR)
set(CMAKE_LEGACY_CYGWIN32 0)

cmake_policy(SET CMP0072 NEW)
cmake_policy(SET CMP0046 NEW)

project(APG)

set(VERSION_MAJOR 0)
set(VERSION_MINOR 5)
set(VERSION_PATCH 0)

set(CMAKE_CXX_STANDARD 14)

set(VERSION "${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH}")
message("Conifguring APG version ${VERSION}.")

set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)

if ( CMAKE_BUILD_TYPE MATCHES Debug)
	message("Building debug library.")
	set (APG_DEBUG TRUE)
else ()
	message("Building release library.")
	set (APG_DEBUG FALSE)
endif ()

option(APG_NO_SDL "Do not build any component which uses SDL; removes SDL as a dependency. At present this leaves most of APG fairly unusable. Also currently sets APG_NO_GL." OFF)
option(APG_NO_GL "Do not build any component which uses OpenGL/GLEW, removing those as dependencies. Affects graphics rendering capabilities. Also currently sets APG_NO_SDL." OFF)
option(APG_NO_NATIVE "Do not build any component which uses functionality which differs across platforms (think #ifdef _WIN32). Useful if you're trying to build on some arcane platform." OFF)

option(EXCLUDE_TESTS "Should we exclude compiling all tests?" OFF)
option(EXCLUDE_GL_TEST "Should we exclude compiling the OpenGL TMX rendering test?" OFF)
option(EXCLUDE_SDL_TEST "Should we exclude compiling the SDL TMX rendering test?" OFF)
option(EXCLUDE_AUDIO_TEST "Should we exclude compiling the audio test?" OFF)

if( APG_NO_GL OR APG_NO_SDL )
	message("Disabling GL, SDL and all tests because either APG_NO_GL or APG_NO_SDL was specified.")
	set(APG_NO_SDL ON)
	set(APG_NO_GL ON)

	set(EXCLUDE_GL_TEST ON)
	set(EXCLUDE_SDL_TEST ON)
	set(EXCLUDE_AUDIO_TEST ON)
endif()

if( EXCLUDE_TESTS )
	message("All tests disabled")
	set(EXCLUDE_GL_TEST ON)
	set(EXCLUDE_SDL_TEST ON)
	set(EXCLUDE_AUDIO_TEST ON)
endif()

if( APG_NO_NATIVE )
	message("Warning: APG_NO_NATIVE is not thoroughly tested so there could be bugs!")
endif()

message ("Finding dependencies for APG.")

if ( NOT APG_NO_SDL )
	if( NOT EMSCRIPTEN )
		find_package(SDL2 REQUIRED)
		find_package(SDL2_image REQUIRED)
		find_package(SDL2_mixer REQUIRED)
		find_package(SDL2_ttf REQUIRED)
		find_package(SDL2_net REQUIRED)
	endif()
endif ()

if ( NOT APG_NO_GL )
	if(NOT EMSCRIPTEN)
		find_package(OpenGL REQUIRED)
		find_package(GLEW REQUIRED)
	endif()
endif ()

#find_package(GLM REQUIRED)
#find_package(rapidjson REQUIRED)

#find_package(TmxParser REQUIRED)
#find_package(TinyXML2 REQUIRED)

#find_package(spdlog REQUIRED)

set(RAPIDJSON_BUILD_DOC OFF)
set(RAPIDJSON_BUILD_EXAMPLES OFF)
set(RAPIDJSON_BUILD_TESTS OFF)
set(SPDLOG_BUILD_TESTING OFF)
set(SPDLOG_BUILD_EXAMPLES OFF)
set(BUILD_TESTING OFF)  # tinyxml2 doesn't namespace this option

if ( EMSCRIPTEN )
	set(CMAKE_CXX_FLAGS_BASE "${CMAKE_CXX_FLAGS_BASE} -s USE_ZLIB=1")
	set(ZLIB_LIBRARIES "-s USE_ZLIB=1")
	set(ZLIB_INCLUDE_DIRS "")
else ()
	find_package(ZLIB REQUIRED)
endif ()

set(RAPIDJSON_BUILD_DOC OFF CACHE BOOL "We don't build the rapidjson docs")
set(RAPIDJSON_BUILD_EXAMPLES OFF CACHE BOOL "We don't build the rapidjson examples")
set(RAPIDJSON_BUILD_TESTS OFF CACHE BOOL "We don't build rapidjson tests")
set(SPDLOG_BUILD_TESTING OFF CACHE BOOL "We don't build spdlog tests")
set(SPDLOG_BUILD_EXAMPLES OFF CACHE BOOL "We don't build spdlog examples")
set(BUILD_TESTING OFF CACHE BOOL "We don't build tinyxml2 tests")  # tinyxml2 doesn't namespace this option

# GLM isn't needed to be built - it's header only
# add_subdirectory(vendor/glm)

add_subdirectory(vendor/rapidjson)
add_subdirectory(vendor/spdlog)
add_subdirectory(vendor/tinyxml2)
#add_subdirectory(vendor/tmxparser)

configure_file(${PROJECT_SOURCE_DIR}/vendor/tmxparser/src/Tmx.h.in ${PROJECT_BINARY_DIR}/Tmx.h)
file(GLOB_RECURSE VENDOR_TMXPARSER_SOURCES ${PROJECT_SOURCE_DIR}/vendor/tmxparser/src/*.cpp)
file(GLOB_RECURSE VENDOR_TMXPARSER_HEADERS ${PROJECT_SOURCE_DIR}/vendor/tmxparser/src/*.h ${PROJECT_BINARY_DIR}/Tmx.h)

set(VENDOR_TMXPARSER_FILES ${VENDOR_TMXPARSER_SOURCES} ${VENDOR_TMXPARSER_HEADERS})
set(VENDOR_TMXPARSER_INCLUDE_DIRS ${PROJECT_SOURCE_DIR}/vendor/tmxparser/src)
set(VENDOR_GLM_INCLUDE_DIRS ${PROJECT_SOURCE_DIR}/vendor/glm)
set(VENDOR_RAPIDJSON_INCLUDE_DIRS ${PROJECT_SOURCE_DIR}/vendor/rapidjson/include)
set(VENDOR_TINYXML2_INCLUDE_DIRS ${PROJECT_SOURCE_DIR}/vendor/tinyxml2)

set(VENDOR_PUBLIC_INCLUDE_DIRS ${VENDOR_TMXPARSER_INCLUDE_DIRS} ${VENDOR_GLM_INCLUDE_DIRS} ${VENDOR_RAPIDJSON_INCLUDE_DIRS})
set(VENDOR_INCLUDE_DIRS ${VENDOR_TINYXML2_INCLUDE_DIRS})
set(VENDOR_FILES ${VENDOR_TMXPARSER_FILES})

set(BASE_INCLUDE_DIRS
	"include"
	${PROJECT_BINARY_DIR}
	${ZLIB_INCLUDE_DIRS}
	)

if ( NOT APG_NO_SDL )
	set(SDL_INCLUDE_DIRS
		${SDL2_INCLUDE_DIR}
		${SDL2_TTF_INCLUDE_DIR}
		${SDL2_IMAGE_INCLUDE_DIR}
		${SDL2_MIXER_INCLUDE_DIR}
		${SDL2_NET_INCLUDE_DIR}
		)
else()
	set(SDL_INCLUDE_DIRS "")
endif ()

if ( NOT APG_NO_GL )
	set(GL_INCLUDE_DIRS
		${OPENGL_INCLUDE_DIR}
		${GLEW_INCLUDE_DIRS}
		)
else()
	set(GL_INCLUDE_DIRS "")
endif ()


file(GLOB_RECURSE APG_SOURCES ${PROJECT_SOURCE_DIR}/src/*.cpp)
file(GLOB_RECURSE APG_HEADERS ${PROJECT_SOURCE_DIR}/include/*.hpp)
file(GLOB_RECURSE APG_TEST_ASSETS ${PROJECT_SOURCE_DIR}/assets/*)

set(APG_SOURCES ${APG_SOURCES} ${EXTRA_SOURCES})
set(FULL_SOURCES ${APG_SOURCES} ${VENDOR_FILES})

if( DEFINED WIN32 )
	if( MSVC )
		set(OS_FLAGS "")
		set(COMPILER_FLAGS "/GR /EHsc")
		set(OS_LIBS "")

		# VS 2015 has a linker issue when using the official SDL2 libs, this should fix it
		if(MSVC_VERSION GREATER 1800)
			message ("Using legacy STDIO fix for MSVC 15.")
			set(OS_LIBS ${OS_LIBS} legacy_stdio_definitions)
			set(EXTRA_SOURCES ${PROJECT_SOURCE_DIR}/MSVC/vs2015_io_fix.cpp)
		endif()
	else ()
		# MinGW
		set (OS_FLAGS "-mwindows")
		set (OS_LIBS Version Imm32 winmm vorbisfile ogg vorbis winsock32 mingw32)
	endif ()
elseif ( DEFINED EMSCRIPTEN )
	set (OS_FLAGS "-s WASM=1 -s USE_SDL=2 -s USE_SDL_IMAGE=2 -s SDL2_IMAGE_FORMATS='[\"png\"]' -s USE_SDL_NET=2 -s USE_SDL_TTF=2 -s USE_WEBGL2=1")
	set (OS_LIBS "")
else ()
	set (OS_FLAGS -fPIC)
	set (OS_LIBS "")
endif ()

if ( NOT MSVC )
	set(COMPILER_FLAGS -Wall -Wextra -Wno-unused-parameter -Wno-unused-variable)
endif ()

add_library(APG STATIC ${FULL_SOURCES} ${APG_HEADERS})
target_include_directories(APG PUBLIC $<$<NOT:$<CONFIG:APG_NO_SDL>>:${SDL_INCLUDE_DIRS}> $<$<NOT:$<CONFIG:APG_NO_GL>>:${GL_INCLUDE_DIRS}> ${VENDOR_PUBLIC_INCLUDE_DIRS})
target_include_directories(APG PRIVATE ${BASE_INCLUDE_DIRS} ${VENDOR_INCLUDE_DIRS})
target_compile_definitions(APG PUBLIC GLM_FORCE_RADIANS $<$<CONFIG:APG_NO_GL>:APG_NO_GL> $<$<CONFIG:APG_NO_SDL>:APG_NO_SDL>)
target_compile_options(APG PUBLIC ${COMPILER_FLAGS} ${OS_FLAGS})


if ( (NOT EXCLUDE_SDL_TEST) OR (NOT EXCLUDE_GL_TEST) OR (NOT EXCLUDE_AUDIO_TEST) )
	file(MAKE_DIRECTORY assets)
	file(COPY ${APG_TEST_ASSETS} DESTINATION assets)
	set(EXAMPLE_LIBS ${SDL2_LIBRARY}
		${SDL2_TTF_LIBRARIES}
		${SDL2_IMAGE_LIBRARY}
		${SDL2_MIXER_LIBRARY}
		${SDL2_NET_LIBRARY}
		${GLEW_LIBRARIES}
		${OPENGL_LIBRARIES}
		tinyxml2
		${OS_LIBS}
		${ZLIB_LIBRARIES}
		)

	if ( EMSCRIPTEN )
		set (CMAKE_EXECUTABLE_SUFFIX ".html")
	endif ()
endif ( )

set(BASE_LINKER_FLAGS ${CMAKE_EXE_LINKER_FLAGS})

if ( EMSCRIPTEN )
	set(BASE_LINKER_FLAGS "${BASE_LINKER_FLAGS} -s ALLOW_MEMORY_GROWTH=1")
elseif(APPLE)
	set(BASE_LINKER_FLAGS "-framework OpenGL -framework GLUT")
endif ()

if ( NOT EXCLUDE_SDL_TEST)
	set (SDLRENDERTEST_FLAGS "")
	set (SDLRENDERTEST_SOURCES test/APGSDLRenderTest.cpp)
	set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${SDLRENDERTEST_FLAGS}")

	if ( EMSCRIPTEN )
		set (CMAKE_EXE_LINKER_FLAGS "${BASE_LINKER_FLAGS} --embed-file assets/world1.tmx --embed-file assets/sample_indoor.tmx --embed-file assets/world1tileset.png --embed-file assets/npctileset.png --embed-file assets/roguelike_sheet.png -O2")
	endif ()

	add_executable(SDLRenderTest ${SDLRENDERTEST_SOURCES} ${EXTRA_SOURCES})
	target_link_libraries(SDLRenderTest APG ${EXAMPLE_LIBS})
	target_include_directories(SDLRenderTest PRIVATE ${BASE_INCLUDE_DIRS} ${SDL_INCLUDE_DIRS} ${GL_INCLUDE_DIRS})
endif ( NOT EXCLUDE_SDL_TEST )

if ( NOT EXCLUDE_GL_TEST )
	set (GLRENDERTEST_FLAGS "")
	set (GLRENDERTEST_SOURCES test/APGGLRenderTest.cpp)
	set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${GLRENDERTEST_FLAGS}")

	if ( EMSCRIPTEN )
		set (CMAKE_EXE_LINKER_FLAGS "${BASE_LINKER_FLAGS} --embed-file assets/world1.tmx --embed-file assets/sample_indoor.tmx --embed-file assets/world1tileset.png --embed-file assets/npctileset.png --embed-file assets/roguelike_sheet.png --embed-file assets/pass_vertex-es3.glslv --embed-file assets/red_frag-es3.glslf --embed-file assets/player.png  --embed-file assets/player16.png --embed-file assets/test_font.ttf -s USE_WEBGL2=1 -O2")
	endif ()

	add_executable(GLRenderTest ${GLRENDERTEST_SOURCES} ${EXTRA_SOURCES})
	target_link_libraries(GLRenderTest APG ${EXAMPLE_LIBS})
	target_include_directories(GLRenderTest PRIVATE ${BASE_INCLUDE_DIRS} ${SDL_INCLUDE_DIRS} ${GL_INCLUDE_DIRS})
endif ( NOT EXCLUDE_GL_TEST )

if ( NOT EXCLUDE_AUDIO_TEST )
	set (AUDIOTEST_FLAGS "")
	set (AUDIOTEST_SOURCES test/APGAudioTest.cpp)
	set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${AUDIOTEST_FLAGS}")

	if ( EMSCRIPTEN )
		set (CMAKE_EXE_LINKER_FLAGS "${BASE_LINKER_FLAGS} --embed-file assets/test_music.ogg --embed-file assets/test_sound.wav -O2")
	endif ()

	add_executable(AudioTest ${AUDIOTEST_SOURCES} ${EXTRA_SOURCES})
	target_link_libraries(AudioTest APG ${EXAMPLE_LIBS})
	target_include_directories(AudioTest PRIVATE ${BASE_INCLUDE_DIRS} ${SDL_INCLUDE_DIRS} ${GL_INCLUDE_DIRS})
endif ( NOT EXCLUDE_AUDIO_TEST )

install (TARGETS APG DESTINATION lib)
install (DIRECTORY ${PROJECT_SOURCE_DIR}/include/APG DESTINATION include)