CMakeLists.txt

# require version 3.10 or higher
cmake_minimum_required(VERSION 3.10)

#
# Project
#
#   - dictates the output executable filename
#
project(TestApp)

# Options you can set via command-line
option(HAS_TERMINAL "Show a terminal window for STDOUT/STDERR" ON)

#
# C_CXX_SOURCES_DIR
#
#   - the place where your C/C++ source files are located
#
set(C_CXX_SOURCES_DIR "src")

#
# C_CXX_HEADERS_DIR
#
#   - the place where your C/C++ header files are located
#
set(C_CXX_HEADERS_DIR "include")

#
# ASSETS_DIR
#
#   - the place where your pictures, sound files, etc.. live
#
set(ASSETS_DIR "assets")

##########################################################################
# DO NOT EDIT BELOW THIS LINE UNLESS YOU KNOW WHAT YOU ARE DOING!!       #
##########################################################################

# Set C++ Standards
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

# output executable basename
set(OutputExecutable "${CMAKE_PROJECT_NAME}")

######################################################################
# Directories

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")

# We need to specify the output for each configuration to make it work
# on Visual Studio solutions.
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_DEBUG "${CMAKE_BINARY_DIR}/lib")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_DEBUG "${CMAKE_BINARY_DIR}/lib")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG "${CMAKE_BINARY_DIR}/bin")
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELWITHDEBINFO "${CMAKE_BINARY_DIR}/lib")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_RELWITHDEBINFO "${CMAKE_BINARY_DIR}/lib")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELWITHDEBINFO "${CMAKE_BINARY_DIR}/bin")
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELEASE "${CMAKE_BINARY_DIR}/lib")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE "${CMAKE_BINARY_DIR}/lib")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE "${CMAKE_BINARY_DIR}/bin")
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_PROFILE "${CMAKE_BINARY_DIR}/lib")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_PROFILE "${CMAKE_BINARY_DIR}/lib")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_PROFILE "${CMAKE_BINARY_DIR}/bin")

set(SOURCE_DATA_DIR        ${CMAKE_CURRENT_SOURCE_DIR}/${ASSETS_DIR})
set(SOURCE_CXX_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/${C_CXX_HEADERS_DIR})
set(SOURCE_CXX_SRC_DIR     ${CMAKE_CURRENT_SOURCE_DIR}/${C_CXX_SOURCES_DIR})

# Source Files are Curated Here
file(
    GLOB_RECURSE SOURCE_CXX_FILES
    "${SOURCE_CXX_SRC_DIR}/*.cpp"
)

# Search in the "cmake" directory for additional CMake modules.
list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)

# Executable aka binary output
add_executable(${OutputExecutable} ${SOURCE_CXX_FILES})

######################################################################
# MacOS
######################################################################


if(APPLE)
    
    # OpenGL
    set(OpenGL_GL_PREFERENCE LEGACY)
    find_package(OpenGL REQUIRED)
    include_directories(${OpenGL_INCLUDE_DIRS})
    target_link_libraries(${OutputExecutable} ${OpenGL_LIBRARIES} OpenGL::GL)

    # Carbon
    FIND_LIBRARY(CARBON_LIBRARY Carbon)
    target_link_libraries(${OutputExecutable} ${CARBON_LIBRARY})

    # GLUT
    find_package(GLUT REQUIRED)
    target_link_libraries(${OutputExecutable} ${GLUT_LIBRARIES})

    # Threads
    find_package(Threads REQUIRED)
    target_link_libraries(${OutputExecutable} Threads::Threads)
    include_directories(${Threads_INCLUDE_DIRS})
    
    find_package(PNG REQUIRED)
    target_link_libraries(${OutputExecutable} PNG::PNG)
    include_directories(${PNG_INCLUDE_DIRS})
    
endif() # APPLE

######################################################################
# Windows: MinGW
######################################################################
if(WIN32 AND MINGW)
    
    # OpenGL
    set(OpenGL_GL_PREFERENCE LEGACY)
    find_package(OpenGL REQUIRED)
    include_directories(${OpenGL_INCLUDE_DIRS})
    target_link_libraries(${OutputExecutable} ${OpenGL_LIBRARIES} OpenGL::GL)

    if (NOT HAS_TERMINAL)
        target_link_libraries(${OutputExecutable} -mwindows -municode)
    endif (NOT HAS_TERMINAL)

    # GDI+
    set(GDIPLUS_LIBRARY gdiplus)
    target_link_libraries(${OutputExecutable} ${GDIPLUS_LIBRARY})
    
    # Shlwapi
    set(SHLWAPI_LIBRARY shlwapi)
    target_link_libraries(${OutputExecutable} ${SHLWAPI_LIBRARY})
    
    # Dwmapi
    set(DWMAPI_LIBRARY dwmapi)
    target_link_libraries(${OutputExecutable} ${DWMAPI_LIBRARY})

    # stdc++fs
    target_link_libraries(${OutputExecutable} stdc++fs)

endif()

######################################################################
# Windows: Visual Studio / MSVC
######################################################################
if(WIN32 AND MSVC)
    
    # OpenGL
    set(OpenGL_GL_PREFERENCE LEGACY)
    find_package(OpenGL REQUIRED)
    include_directories(${OpenGL_INCLUDE_DIRS})
    target_link_libraries(${OutputExecutable} ${OpenGL_LIBRARIES} OpenGL::GL)

    # set the startup project to the target executable instead of ALL_BUILD
    set_property(
        DIRECTORY
        ${CMAKE_CURRENT_SOURCE_DIR}
        PROPERTY
        VS_STARTUP_PROJECT
        ${OutputExecutable}
    )
    
    # set working directory for Visual Studio Debugger
    set_target_properties(
        ${OutputExecutable} PROPERTIES
        VS_DEBUGGER_WORKING_DIRECTORY "${CMAKE_BINARY_DIR}/bin"
    )
    
    # set subsytem, console if HAS_TERMINAL is true. windows if not
    if (HAS_TERMINAL)
        target_link_options(${OutputExecutable} PRIVATE "/SUBSYSTEM:CONSOLE")
    else ()
        target_link_options(${OutputExecutable} PRIVATE "/SUBSYSTEM:WINDOWS")
    endif ()

    # GDI+
    set(GDIPLUS_LIBRARY gdiplus)
    target_link_libraries(${OutputExecutable} ${GDIPLUS_LIBRARY})
    
    # Shlwapi
    set(SHLWAPI_LIBRARY shlwapi)
    target_link_libraries(${OutputExecutable} ${SHLWAPI_LIBRARY})
    
    # Dwmapi
    set(DWMAPI_LIBRARY dwmapi)
    target_link_libraries(${OutputExecutable} ${DWMAPI_LIBRARY})

endif() # Visual Studio / MSVC

######################################################################
# Linux: using anything?
######################################################################
if(UNIX AND NOT APPLE AND NOT EMSCRIPTEN)
    
    # OpenGL
    set(OpenGL_GL_PREFERENCE LEGACY)
    find_package(OpenGL REQUIRED)
    include_directories(${OpenGL_INCLUDE_DIRS})
    target_link_libraries(${OutputExecutable} ${OpenGL_LIBRARIES} OpenGL::GL)

    # X11
    find_package(X11 REQUIRED)
    target_link_libraries(${OutputExecutable} X11::X11)

    include_directories(${X11_INCLUDE_DIRS})

    # Threads
    find_package(Threads REQUIRED)
    target_link_libraries(${OutputExecutable} Threads::Threads)
    include_directories(${Threads_INCLUDE_DIRS})

    find_package(PNG REQUIRED)
    target_link_libraries(${OutputExecutable} PNG::PNG)
    include_directories(${PNG_INCLUDE_DIRS})

    # stdc++fs
    target_link_libraries(${OutputExecutable} stdc++fs)

    # dl, for miniaudio
    target_link_libraries(${OutputExecutable} dl)

endif() # Linux

######################################################################
# Emscripten
######################################################################
if (EMSCRIPTEN)
    
    # Generate an HTML file
    set(CMAKE_EXECUTABLE_SUFFIX .html)

    # Build Cache: SDL2_mixer, libpng, zlib
    execute_process(COMMAND "${EMSCRIPTEN_ROOT_PATH}/embuilder${EMCC_SUFFIX}" build sdl2_mixer libpng zlib)
    
    if(EXISTS "${SOURCE_DATA_DIR}" AND IS_DIRECTORY "${SOURCE_DATA_DIR}")
        target_link_options(
            ${OutputExecutable}
            PRIVATE
            -sALLOW_MEMORY_GROWTH=1
            -sMAX_WEBGL_VERSION=2
            -sMIN_WEBGL_VERSION=2
            -sUSE_LIBPNG=1
            -sLLD_REPORT_UNDEFINED
            --preload-file ${SOURCE_DATA_DIR}@assets)
    else()
        target_link_options(
            ${OutputExecutable}
            PRIVATE
            -sALLOW_MEMORY_GROWTH=1
            -sMAX_WEBGL_VERSION=2
            -sMIN_WEBGL_VERSION=2
            -sUSE_LIBPNG=1
            -sLLD_REPORT_UNDEFINED)
    endif()

endif() # Emscripten

######################################################################
# Set include directory
######################################################################
if(IS_DIRECTORY ${SOURCE_CXX_INCLUDE_DIR})
    include_directories(${SOURCE_CXX_INCLUDE_DIR})
endif()

######################################################################
# Copy assets/ directory target
######################################################################

set(DATA_OUTPUT_DIR ${CMAKE_BINARY_DIR}/bin/${ASSETS_DIR})

file(GLOB_RECURSE src_data_files
    RELATIVE ${SOURCE_DATA_DIR}/ "${SOURCE_DATA_DIR}/*.*" "${SOURCE_DATA_DIR}/*")
foreach(fn ${src_data_files})
    add_custom_command(
        OUTPUT ${DATA_OUTPUT_DIR}/${fn}
        COMMAND ${CMAKE_COMMAND} -E copy ${SOURCE_DATA_DIR}/${fn} ${DATA_OUTPUT_DIR}/${fn}
        MAIN_DEPENDENCY ${SOURCE_DATA_DIR}/${fn})
    list(APPEND out_data_files ${DATA_OUTPUT_DIR}/${fn})
endforeach()

add_custom_target(copy_data DEPENDS ${out_data_files})

# Copy Asset Files, if not Emscripten
if (NOT EMSCRIPTEN)
    add_dependencies(${OutputExecutable} copy_data)
endif()