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# Copyright © 2018, VideoLAN and dav1d authors
# 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'],
    version: '0.0.1',
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    default_options: ['c_std=c99',
                      'warning_level=2'],
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    meson_version: '>= 0.47.0')

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dav1d_version_array    = meson.project_version().split('.')
dav1d_version_major    = dav1d_version_array[0]
dav1d_version_minor    = dav1d_version_array[1]
dav1d_version_revision = dav1d_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
dav1d_inc_dirs = include_directories(['.', 'include', 'include/dav1d'])

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#
# Option handling
#
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# Bitdepth option
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dav1d_bitdepths = get_option('bitdepths')
foreach bitdepth : dav1d_bitdepths
    cdata.set('CONFIG_@0@BPC'.format(bitdepth), 1)
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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#
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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 = []

# 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
endif
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# On Windows, we use a compatibility layer to emulate pthread
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if host_machine.system() == 'windows'
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    thread_dependency = declare_dependency(sources : files('src/win32/thread.c'))
else
    thread_dependency = dependency('threads')
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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(
            include_directories : include_directories('include/compat'),
        )
    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


# 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)
endif


# 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
optional_arguments = [
  '-Wundef',
  '-Wvla', # should be '-Werror=vla
]

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')


# Stack alignments flags

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stackalign_flag = []
stackrealign_flag = []

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

        cdata_asm.set10('PIC', true)
    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)
    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')

    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('src')
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subdir('tools')
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subdir('tests')
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#
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# Generate pkg-config .pc file
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#
pkg_mod = import('pkgconfig')
pkg_mod.generate(libraries: libdav1d,
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    version: meson.project_version(),
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    name: 'libdav1d',
    filebase: 'dav1d',
    description: 'AV1 decoding library'
)