meson.build

project(
    'pygame_ce',
    ['c', 'cython'], # Project type. We need a C compiler and cython
    version: run_command(
        [find_program('python3', 'python'), 'buildconfig/get_version.py'],
        check: true,
    ).stdout().strip(),
    default_options: [
        # the warning level is set in code below, gives more flexibility there
        'warning_level=0',
    ],
)

defines = run_command(
    [find_program('python3', 'python'), 'buildconfig/get_version.py', '--macros'],
    check: true,
).stdout().strip().split()
foreach define : defines
    add_global_arguments(define, language: 'c')
endforeach

pg = 'pygame' # python base package name

if host_machine.system() == 'windows'
    plat = 'win'
elif host_machine.system() == 'darwin'
    plat = 'mac'
elif host_machine.system() == 'linux'
    plat = 'linux'
elif host_machine.system() == 'android'
    plat = 'android'
    error(
        'The meson buildconfig of pygame-ce does not support android for now.',
        'However it may be added in the future',
    )
elif host_machine.system() == 'emscripten'
    plat = 'emscripten'
    error(
        'The meson buildconfig of pygame-ce does not support emscripten for now. ',
        'However it may be added in the future',
    )
else
    # here it one of: cygwin, dragonfly, freebsd, gnu, haiku, netbsd, openbsd, sunos
    plat = 'unix'
    warning(
        'pygame-ce does not actively support building on your platform:',
        host_machine.system(),
    )
endif

cc = meson.get_compiler('c')

fs = import('fs')

py = import('python').find_installation(pure: false)
py_dep = py.dependency()

is_pypy = py.get_variable('implementation_lower', '') == 'pypy'

if not cc.has_header('Python.h', dependencies: py_dep)
    error(
        'Cannot use `Python.h`. Perhaps you need to install python-dev|python-devel',
    )
endif

pg_dir = py.get_install_dir() / pg

pg_inc_dirs = []
pg_lib_dirs = []
if plat == 'win' and host_machine.cpu_family().startswith('x86')
    # yes, this is a bit ugly and hardcoded but it is what it is
    # TODO (middle-term goal) - Should migrate away from this
    # consider meson wraps? Hopefully can also get the same build path as below
    arch_suffix = 'x' + host_machine.cpu_family().substring(-2)
    base_dir = meson.current_source_dir()
    prebuilt_dir = base_dir / 'prebuilt-' + arch_suffix

    # download prebuilts (uses legacy builconfig code)
    if not fs.is_dir(prebuilt_dir)
        run_command(
            [
                find_program('python3', 'python'),
                'buildconfig/download_win_prebuilt.py',
            ],
            check: true,
        )
    endif

    sdl_ver = '2.30.4'
    sdl_image_ver = '2.8.2'
    sdl_mixer_ver = '2.8.0'
    sdl_ttf_ver = '2.22.0'

    dlls = []

    # SDL2
    sdl_dir = prebuilt_dir / 'SDL2-@0@'.format(sdl_ver)
    sdl_lib_dir = sdl_dir / 'lib' / arch_suffix
    pg_inc_dirs += fs.relative_to(sdl_dir / 'include', base_dir)
    pg_lib_dirs += sdl_lib_dir
    dlls += sdl_lib_dir / 'SDL2.dll'

    # SDL2_image
    sdl_image_dir = prebuilt_dir / 'SDL2_image-@0@'.format(sdl_image_ver)
    sdl_image_lib_dir = sdl_image_dir / 'lib' / arch_suffix
    pg_inc_dirs += fs.relative_to(sdl_image_dir / 'include', base_dir)
    pg_lib_dirs += sdl_image_lib_dir
    dlls += [
        sdl_image_lib_dir / 'SDL2_image.dll',
        sdl_image_lib_dir / 'optional' / 'libjpeg-62.dll',
        sdl_image_lib_dir / 'optional' / 'libpng16-16.dll',
        sdl_image_lib_dir / 'optional' / 'libtiff-5.dll',
        sdl_image_lib_dir / 'optional' / 'libwebp-7.dll',
        sdl_image_lib_dir / 'optional' / 'libwebpdemux-2.dll',
    ]

    # SDL2_mixer
    sdl_mixer_dir = prebuilt_dir / 'SDL2_mixer-@0@'.format(sdl_mixer_ver)
    sdl_mixer_lib_dir = sdl_mixer_dir / 'lib' / arch_suffix
    pg_inc_dirs += fs.relative_to(sdl_mixer_dir / 'include', base_dir)
    pg_lib_dirs += sdl_mixer_lib_dir
    dlls += [
        sdl_mixer_lib_dir / 'SDL2_mixer.dll',
        sdl_mixer_lib_dir / 'optional' / 'libogg-0.dll',
        sdl_mixer_lib_dir / 'optional' / 'libopus-0.dll',
        sdl_mixer_lib_dir / 'optional' / 'libopusfile-0.dll',
        sdl_mixer_lib_dir / 'optional' / 'libwavpack-1.dll',
        sdl_mixer_lib_dir / 'optional' / 'libxmp.dll',
    ]

    # SDL2_ttf
    sdl_ttf_dir = prebuilt_dir / 'SDL2_ttf-@0@'.format(sdl_ttf_ver)
    sdl_ttf_lib_dir = sdl_ttf_dir / 'lib' / arch_suffix
    pg_inc_dirs += fs.relative_to(sdl_ttf_dir / 'include', base_dir)
    pg_lib_dirs += sdl_ttf_lib_dir
    dlls += sdl_ttf_lib_dir / 'SDL2_ttf.dll'

    # freetype, portmidi and porttime
    common_lib_dir = prebuilt_dir / 'lib'
    pg_inc_dirs += fs.relative_to(prebuilt_dir / 'include', base_dir)
    pg_lib_dirs += common_lib_dir
    dlls += [common_lib_dir / 'freetype.dll', common_lib_dir / 'portmidi.dll']

    # clean unneeded file that causes build issues
    unneeded_file = common_lib_dir / 'libportmidi.dll.a'
    if fs.exists(unneeded_file)
        run_command(
            [
                find_program('python3', 'python'),
                '-c',
                'import os; os.remove("@0@")'.format(unneeded_file),
            ],
            check: true,
        )
    endif

    # put dlls in root of install
    install_data(dlls, install_dir: pg_dir, install_tag: 'pg-tag')
else
    bases = ['/usr/local', '/usr', '/opt/homebrew', '/opt/local']
    foreach inc_dir : bases
        foreach sub_inc : [
            '',
            '/SDL2',
            '/freetype2',
        ]
            full_inc = inc_dir / 'include' + sub_inc
            if fs.exists(full_inc)
                pg_inc_dirs += full_inc
            endif
        endforeach
    endforeach

    foreach lib_dir : bases
        foreach sub_lib : ['lib', 'lib64']
            full_lib = lib_dir / sub_lib
            if fs.exists(full_lib)
                pg_lib_dirs += full_lib
            endif
        endforeach
    endforeach
endif

# TODO: add version constraints?
sdl_dep = dependency('sdl2', required: false)
if not sdl_dep.found()
    sdl_dep = declare_dependency(
        include_directories: pg_inc_dirs,
        dependencies: cc.find_library('SDL2', dirs: pg_lib_dirs),
    )
endif

# optional
sdl_image_dep = dependency('SDL2_image', required: false)
if not sdl_image_dep.found()
    sdl_image_dep = declare_dependency(
        include_directories: pg_inc_dirs,
        dependencies: cc.find_library(
            'SDL2_image',
            dirs: pg_lib_dirs,
            required: get_option('image'),
        ),
    )
endif

sdl_mixer_dep = dependency('SDL2_mixer', required: false)
if not sdl_mixer_dep.found()
    sdl_mixer_dep = declare_dependency(
        include_directories: pg_inc_dirs,
        dependencies: cc.find_library(
            'SDL2_mixer',
            dirs: pg_lib_dirs,
            required: get_option('mixer'),
        ),
    )
endif

sdl_ttf_dep = dependency('SDL2_ttf', required: false)
if not sdl_ttf_dep.found()
    sdl_ttf_dep = declare_dependency(
        include_directories: pg_inc_dirs,
        dependencies: cc.find_library(
            'SDL2_ttf',
            dirs: pg_lib_dirs,
            required: get_option('font'),
        ),
    )
endif

freetype_dep = dependency('freetype2', required: false)
if not freetype_dep.found()
    freetype_dep = declare_dependency(
        include_directories: pg_inc_dirs,
        dependencies: cc.find_library(
            'freetype',
            dirs: pg_lib_dirs,
            required: get_option('freetype'),
        ),
    )
endif

portmidi_dep = dependency('portmidi', required: false)
if not portmidi_dep.found()
    portmidi_dep = declare_dependency(
        include_directories: pg_inc_dirs,
        dependencies: cc.find_library(
            'portmidi',
            dirs: pg_lib_dirs,
            required: get_option('midi'),
        ),
    )
endif

portmidi_deps = [portmidi_dep]

if portmidi_dep.found()
    # porttime can be a separate library, or be inbuilt in portmidi.
    # So if it is available as a separate library, include it as a dependency
    porttime_dep = dependency('porttime', required: false)
    if not porttime_dep.found()
        porttime_dep = cc.find_library(
            'porttime',
            dirs: pg_lib_dirs,
            required: false,
        )
    endif

    if porttime_dep.found()
        portmidi_deps += porttime_dep
    endif
endif

pg_base_deps = [sdl_dep, py_dep]

summary(
    {
        'SDL2': sdl_dep.found(),
        'SDL2_image': sdl_image_dep.found(),
        'SDL2_mixer': sdl_mixer_dep.found(),
        'SDL2_ttf': sdl_ttf_dep.found(),
        'freetype2': freetype_dep.found(),
        'portmidi': portmidi_dep.found(),
        'porttime': portmidi_dep.found() ? porttime_dep.found() : false,
    },
    section: 'Dependencies',
)

simd_avx2 = false
simd_avx2_flags = []
if host_machine.cpu_family().startswith('x86')
    flag = (cc.get_argument_syntax() == 'msvc') ? '/arch:AVX2' : '-mavx2'
    if cc.has_argument(flag)
        simd_avx2_flags += flag
        simd_avx2 = true
    endif
endif

simd_sse2_neon = false
simd_sse2_neon_flags = []
if host_machine.cpu_family() == 'arm'
    # first check if compiler supports the flag, and use it then. Needed only
    # on 32-bit armv7.
    flag = '-mfpu=neon'
    if cc.has_argument(flag) and host_machine.cpu() == 'armv7l'
        simd_sse2_neon_flags += [flag, '-march=armv7-a']
        simd_sse2_neon = true
    endif
elif host_machine.cpu_family() == 'aarch64'
    # no explicit flag needed in this case
    simd_sse2_neon = true
endif

if simd_sse2_neon
    add_global_arguments('-DPG_ENABLE_ARM_NEON=1', language: 'c')
endif

summary(
    {
        'AVX2': simd_avx2,
        'NEON': simd_sse2_neon,
    },
    section: 'SIMD',
)

# stores werror
warnings_error = []

# module specific warnings (TODO remove these by fixing code)
warnings_temp_freetype = []
warnings_temp_mask = []

if cc.get_argument_syntax() == 'msvc'
    # base warnings on msvc
    add_global_arguments(['/W3', '/wd4142', '/wd4996'], language: 'c')

    warnings_temp_mask += ['/wd6385', '/wd6386']

    if get_option('error_on_warns') and not is_pypy
        warnings_error += '/WX'
    endif
    # TODO: msvc analyzer?
else
    # base warnings on gcc/clang
    add_global_arguments(['-Wall', '-Wno-error=unknown-pragmas'], language: 'c')

    # check for exact gcc (flags not needed on clang)
    if cc.get_id() == 'gcc'
        warnings_temp_freetype += [
            '-Wno-error=unused-but-set-variable',
            '-Wno-error=array-bounds',
        ]
    endif

    if cc.sizeof('long') != 8
        warnings_temp_mask += '-Wno-error=shift-count-overflow'
    endif

    if get_option('error_on_warns') and not is_pypy
        warnings_error += '-Werror'
    endif
endif

subdir('src_c')
subdir('src_py')

if not get_option('stripped')
    # run make_docs and make docs
    if not fs.is_dir('docs/generated')
        make_docs = files('buildconfig/make_docs.py')
        res = run_command(
            [find_program('python3', 'python'), make_docs],
            check: false,
        )
        message(res.stdout().strip())
        message(res.stderr().strip())
    endif
    subdir('docs')
    subdir('test')
    subdir('buildconfig/stubs')
    install_subdir('examples', install_dir: pg_dir, install_tag: 'pg-tag')
    # TODO: install headers? not really important though
endif