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# Copyright © 2018-2019, VideoLAN and dav1d authors
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# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

project('dav1d', ['c'],
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    version: '0.3.1',
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    default_options: ['c_std=c99',
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                      'warning_level=2',
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                      'buildtype=release',
                      'b_ndebug=if-release'],
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    meson_version: '>= 0.47.0')

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dav1d_soname_version   = '1.1.0'
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dav1d_api_version_array    = dav1d_soname_version.split('.')
dav1d_api_version_major    = dav1d_api_version_array[0]
dav1d_api_version_minor    = dav1d_api_version_array[1]
dav1d_api_version_revision = dav1d_api_version_array[2]
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dav1d_src_root = meson.current_source_dir()
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cc = meson.get_compiler('c')

# Configuratin data for config.h
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cdata = configuration_data()
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# Configuration data for config.asm
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cdata_asm = configuration_data()
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# Include directories
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dav1d_inc_dirs = include_directories(['.', 'include/dav1d', 'include'])
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#
# Option handling
#
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# Bitdepth option
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dav1d_bitdepths = get_option('bitdepths')
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foreach bitdepth : ['8', '16']
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    cdata.set10('CONFIG_@0@BPC'.format(bitdepth), dav1d_bitdepths.contains(bitdepth))
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endforeach
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# ASM option
is_asm_enabled = (get_option('build_asm') == true and
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    (host_machine.cpu_family().startswith('x86') or
     host_machine.cpu_family() == 'aarch64'      or
     host_machine.cpu_family().startswith('arm')))
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cdata.set10('HAVE_ASM', is_asm_enabled)

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if is_asm_enabled and get_option('b_sanitize') == 'memory'
    error('asm causes false positive with memory sanitizer. Use \'-Dbuild_asm=false\'.')
endif
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# Logging option
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cdata.set10('CONFIG_LOG', get_option('logging'))
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#
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# OS/Compiler checks and defines
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#

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# Arguments in test_args will be used even on feature tests
test_args = []

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optional_arguments = []

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# Define _POSIX_C_SOURCE to POSIX.1–2001 (IEEE Std 1003.1-2001)
test_args  += '-D_POSIX_C_SOURCE=200112L'
add_project_arguments('-D_POSIX_C_SOURCE=200112L', language: 'c')

if host_machine.system() == 'windows'
    cdata.set('_WIN32_WINNT',           '0x0601')
    cdata.set('UNICODE',                1) # Define to 1 for Unicode (Wide Chars) APIs
    cdata.set('_UNICODE',               1) # Define to 1 for Unicode (Wide Chars) APIs
    cdata.set('__USE_MINGW_ANSI_STDIO', 1) # Define to force use of MinGW printf
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    if cc.has_function('fseeko', prefix : '#include <stdio.h>', args : test_args)
        cdata.set('_FILE_OFFSET_BITS', 64) # Not set by default by Meson on Windows
    else
        cdata.set('fseeko', '_fseeki64')
        cdata.set('ftello', '_ftelli64')
    endif
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    if (host_machine.cpu_family() == 'x86_64' and cc.get_id() == 'gcc')
        optional_arguments += '-mcmodel=small'
    endif

    # On Windows, we use a compatibility layer to emulate pthread
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    thread_dependency = []
    thread_compat_dep = declare_dependency(sources : files('src/win32/thread.c'))
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else
    thread_dependency = dependency('threads')
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    thread_compat_dep = []
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endif

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# Header checks

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stdatomic_dependency = []
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if not cc.check_header('stdatomic.h')
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    if cc.get_id() == 'msvc'
        # we have a custom replacement for MSVC
        stdatomic_dependency = declare_dependency(
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            include_directories : include_directories('include/compat/msvc'),
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        )
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    elif cc.compiles('''int main() { int v = 0; return __atomic_fetch_add(&v, 1, __ATOMIC_SEQ_CST); }''',
                     name : 'GCC-style atomics', args : test_args)
        stdatomic_dependency = declare_dependency(
            include_directories : include_directories('include/compat/gcc'),
        )
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    else
        error('Atomics not supported')
    endif
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endif

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if cc.check_header('unistd.h')
    cdata.set('HAVE_UNISTD_H', 1)
endif

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if cc.check_header('io.h')
    cdata.set('HAVE_IO_H', 1)
endif

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# Function checks

if not cc.has_function('getopt_long', prefix : '#include <getopt.h>', args : test_args)
    getopt_dependency = declare_dependency(
        sources: files('tools/compat/getopt.c'),
        include_directories : include_directories('include/compat'),
    )
else
    getopt_dependency = []
endif

if cc.has_function('posix_memalign', prefix : '#include <stdlib.h>', args : test_args)
    cdata.set('HAVE_POSIX_MEMALIGN', 1)
elif cc.has_function('_aligned_malloc', prefix : '#include <malloc.h>', args : test_args)
    cdata.set('HAVE_ALIGNED_MALLOC', 1)
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elif cc.has_function('memalign', prefix : '#include <malloc.h>', args : test_args)
    cdata.set('HAVE_MEMALIGN', 1)
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endif

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if (host_machine.cpu_family() == 'aarch64' or
    host_machine.cpu_family().startswith('arm'))
    if cc.has_function('getauxval', prefix : '#include <sys/auxv.h>', args : test_args)
        cdata.set('HAVE_GETAUXVAL', 1)
    endif
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    if cc.has_function('elf_aux_info', prefix : '#include <sys/auxv.h>', args : test_args)
        cdata.set('HAVE_ELF_AUX_INFO', 1)
    endif
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endif
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# Compiler flag tests

if cc.has_argument('-fvisibility=hidden')
    add_project_arguments('-fvisibility=hidden', language: 'c')
else
    warning('Compiler does not support -fvisibility=hidden, all symbols will be public!')
endif

# Compiler flags that should be set
# But when the compiler does not supports them
# it is not an error and silently tolerated
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optional_arguments += [
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  '-Wundef',
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  '-Werror=vla',
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  '-Wno-maybe-uninitialized',
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  '-Wno-missing-field-initializers',
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  '-Wno-unused-parameter',
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  '-Werror=missing-prototypes',
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  '-Wshorten-64-to-32',
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]
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if cc.get_id() == 'msvc'
    optional_arguments += [
      '-wd4028', # parameter different from declaration
      '-wd4996'  # use of POSIX functions
    ]
endif
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if (get_option('buildtype') != 'debug' and get_option('buildtype') != 'plain')
    optional_arguments += '-fomit-frame-pointer'
    optional_arguments += '-ffast-math'
endif

add_project_arguments(cc.get_supported_arguments(optional_arguments), language : 'c')

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# libFuzzer related things
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fuzzing_engine = get_option('fuzzing_engine')
if fuzzing_engine == 'libfuzzer'
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    if not cc.has_argument('-fsanitize=fuzzer')
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        error('fuzzing_engine libfuzzer requires "-fsanitize=fuzzer"')
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    endif
    fuzzer_args = ['-fsanitize=fuzzer-no-link', '-fsanitize=fuzzer']
    add_project_arguments(cc.first_supported_argument(fuzzer_args), language : 'c')
endif
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# Stack alignments flags

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stackalign_flag = []
stackrealign_flag = []

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cdata.set10('ENDIANNESS_BIG', host_machine.endian() == 'big')

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if host_machine.cpu_family().startswith('x86')
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    if get_option('stack_alignment') > 0
        stack_alignment = get_option('stack_alignment')
    elif host_machine.cpu_family() == 'x86_64'
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        if cc.has_argument('-mpreferred-stack-boundary=5')
            stackalign_flag = ['-mpreferred-stack-boundary=5']
            stackrealign_flag = ['-mincoming-stack-boundary=4']
            stack_alignment = 32
        elif cc.has_argument('-mstack-alignment=32')
            stackalign_flag = ['-mstack-alignment=32']
            stackrealign_flag = ['-mstackrealign']
            stack_alignment = 32
        else
            stack_alignment = 16
        endif
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    else
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        if host_machine.system() == 'linux' or host_machine.system() == 'darwin'
            stack_alignment = 16
        elif cc.has_argument('-mpreferred-stack-boundary=4')
            stackalign_flag = ['-mpreferred-stack-boundary=4']
            stackrealign_flag = ['-mincoming-stack-boundary=2']
            stack_alignment = 16
        elif cc.has_argument('-mstack-alignment=16')
            stackalign_flag = ['-mstack-alignment=16']
            stackrealign_flag = ['-mstackrealign']
            stack_alignment = 16
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        else
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            stack_alignment = 4
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        endif
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    endif
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    cdata_asm.set('STACK_ALIGNMENT', stack_alignment)
    cdata.set('STACK_ALIGNMENT', stack_alignment)
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endif

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cdata.set10('ARCH_AARCH64', host_machine.cpu_family() == 'aarch64')
cdata.set10('ARCH_ARM',     host_machine.cpu_family().startswith('arm'))
if (is_asm_enabled and
    (host_machine.cpu_family() == 'aarch64' or
     host_machine.cpu_family().startswith('arm')))

   as_func_code = '''__asm__ (
".func meson_test"
".endfunc"
);
'''
    have_as_func = cc.compiles(as_func_code)
    cdata.set10('HAVE_AS_FUNC', have_as_func)
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    # fedora package build infrastructure uses a gcc specs file to enable
    # '-fPIE' by default. The chosen way only adds '-fPIE' to the C compiler
    # with integrated preprocessor. It is not added to the standalone
    # preprocessor or the preprocessing stage of '.S' files. So we have to
    # compile code to check if we have to define PIC for the arm asm to
    # avoid absolute relocations when building for example checkasm.
    check_pic_code = '''
#if defined(PIC)
#error "PIC already defined"
#elif !(defined(__PIC__) || defined(__pic__))
#error "no pic"
#endif
'''
    if cc.compiles(check_pic_code)
        cdata.set('PIC', '3')
    endif
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endif

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if host_machine.cpu_family().startswith('x86')
    cdata.set10('ARCH_X86', true)
    if host_machine.cpu_family() == 'x86_64'
        cdata_asm.set10('ARCH_X86_64', true)
        cdata.set10('ARCH_X86_64', true)
        cdata_asm.set10('ARCH_X86_32', false)
        cdata.set10('ARCH_X86_32', false)
    else
        cdata_asm.set10('ARCH_X86_64', false)
        cdata.set10('ARCH_X86_64', false)
        cdata_asm.set10('ARCH_X86_32', true)
        cdata.set10('ARCH_X86_32', true)
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        cdata_asm.set10('PIC', true)
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    endif
else
    cdata.set10('ARCH_X86', false)
    cdata.set10('ARCH_X86_64', false)
    cdata.set10('ARCH_X86_32', false)
endif

if cc.symbols_have_underscore_prefix()
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    cdata.set10('PREFIX', true)
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    cdata_asm.set10('PREFIX', true)
endif

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# Generate config.h
config_h_target = configure_file(output: 'config.h', configuration: cdata)
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#
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# ASM specific stuff
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#
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if is_asm_enabled and host_machine.cpu_family().startswith('x86')
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    # Generate config.asm
    config_asm_target = configure_file(output: 'config.asm', output_format: 'nasm', configuration: cdata_asm)
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    # NASM compiler support
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    nasm = find_program('nasm')

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    # check NASM version
    if nasm.found()
        nasm_r = run_command(nasm, '-v')
        out = nasm_r.stdout().strip().split()
        if out[1].to_lower() == 'version'
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            if out[2].version_compare('<2.13.02')
                error('nasm 2.13.02 or later is required, found nasm @0@'.format(out[2]))
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            endif
        else
            error('unexpected nasm version string: @0@'.format(nasm_r.stdout()))
        endif
    endif

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    if host_machine.system() == 'windows'
        nasm_format = 'win'
    elif host_machine.system() == 'darwin'
        nasm_format = 'macho'
    else
        nasm_format = 'elf'
    endif
    if host_machine.cpu_family() == 'x86_64'
        nasm_format += '64'
    else
        nasm_format += '32'
    endif

    nasm_gen = generator(nasm,
        output: '@BASENAME@.obj',
        depfile: '@BASENAME@.obj.ndep',
        arguments: [
            '-f', nasm_format,
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            '-I', '@SOURCE_DIR@/src/',
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            '-I', '@0@/'.format(meson.current_build_dir()),
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            '-MQ', '@OUTPUT@', '-MF', '@DEPFILE@',
            '@EXTRA_ARGS@',
            '@INPUT@',
            '-o', '@OUTPUT@'
        ])
endif

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#
# Include subdir meson.build files
# The order is important!
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subdir('include')
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subdir('doc')

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subdir('src')
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subdir('tools')
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subdir('tests')