cmake_minimum_required(VERSION 3.1)

if (${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
    message(FATAL_ERROR
        "In-source builds not allowed.
        Please make a new directory (called a build directory) and run CMake from there.
        You may need to remove CMakeCache.txt."
    )
endif ()

# OS variables
set(CMAKE_OSX_DEPLOYMENT_TARGET "10.14" CACHE STRING "macOS Deployment Target" FORCE)

# Project
project(whoa)

if (CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
  set(CMAKE_INSTALL_PREFIX "dist" CACHE PATH "Installation prefix" FORCE)
endif ()

set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

set(CMAKE_CXX_STANDARD 11)

set(CMAKE_BUILD_TYPE Debug)

include(lib/system/cmake/system.cmake)

# Build options

# UBsan
set(WHOA_UB_SAN_HELP_TEXT "Disable/Enable the Undefined Behavior Sanitizer. This is turned on by default in Debug build types. Has no effect when using MSVC.")
if (CMAKE_BUILD_TYPE STREQUAL "Debug")
    option(WHOA_UB_SAN WHOA_UB_SAN_HELP_TEXT 1)
else ()
    option(WHOA_UB_SAN WHOA_UB_SAN_HELP_TEXT 0)
endif ()
unset(WHOA_UB_SAN_HELP_TEXT)

# GLSDL 
if (WHOA_SYSTEM_WIN)
    # GLSDL can be disabled on Windows to save time
    option(WHOA_BUILD_GLSDL "Disable/Enable compilation of the OpenGL/SDL2 graphics rendering device on Windows." 0)
elseif (WHOA_SYSTEM_MAC)
    # No need for this, we already have a functioning OpenGL rendering device (CGxDeviceGLL)
    set(WHOA_BUILD_GLSDL 0)
else ()
    # Right now GLSDL is the only rendering device for Linux
    set(WHOA_BUILD_GLSDL 1)
endif ()
if (WHOA_BUILD_GLSDL)
    add_definitions(-DWHOA_BUILD_GLSDL)
endif () 

# FMOD
option(WHOA_BUILD_FMOD "Disable/Enable the use of the FMOD sound API. This introduces a dependency on a proprietary FMOD dynamically linked library." 0)

# Compiler options
if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
    # Some templates abuse offsetof
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-invalid-offsetof")

    if (CMAKE_BUILD_TYPE STREQUAL "Debug" AND WHOA_UB_SAN)
        # Enable UBsan
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=undefined")
        # Allow strange alignments
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-sanitize=alignment")
        # Make encountering UB an unrecoverable error
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-sanitize-recover=all")
    else ()
        # Disable UBsan completely
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-sanitize=undefined")
    endif ()
endif ()

# MinGW Options
if (WHOA_SYSTEM_WIN AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
    set(CMAKE_EXE_LINKER_FLAGS ${CMAKE_EXE_LINKER_FLAGS} "-static-libgcc -static-libstdc++ -static")
endif ()

# OS defines
if (WHOA_SYSTEM_WIN)
    # Avoid win32 header hell
    add_compile_definitions(
        NOMINMAX
        WIN32_LEAN_AND_MEAN
    )

    # Make DirectXMath boring
    add_definitions(
        -D_XM_NO_INTRINSICS_
    )

    # Lua uses various "unsafe" C functions
    add_definitions(
        -D_CRT_SECURE_NO_WARNINGS
    )
endif ()

if (WHOA_SYSTEM_MAC)
    # Suppress OpenGL deprecation warnings
    add_definitions(
        -DGL_SILENCE_DEPRECATION
    )
endif ()

# Threads
if (WHOA_SYSTEM_LINUX OR WHOA_SYSTEM_MAC)
    set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
    find_package(Threads REQUIRED)
endif ()

# Library search paths
if (WHOA_SYSTEM_MAC)
    set(CMAKE_SKIP_BUILD_RPATH FALSE)
    set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
    set(CMAKE_INSTALL_RPATH "@executable_path")
elseif (WHOA_SYSTEM_LINUX)
    set(CMAKE_SKIP_BUILD_RPATH FALSE)
    set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
    set(CMAKE_INSTALL_RPATH "$ORIGIN")
endif ()

add_subdirectory(lib)
add_subdirectory(src)
add_subdirectory(test)
add_subdirectory(vendor)