project('graphene', 'c',
        version: '1.10.2',
        license: 'MIT',
        meson_version: '>= 0.50.1',
        default_options: [
          'buildtype=debugoptimized',
          'c_std=c99',
          'warning_level=1'
        ])

cc = meson.get_compiler('c')
host_system = host_machine.system()

add_project_arguments([ '-D_GNU_SOURCE' ], language: 'c')

# Version
graphene_version = meson.project_version()
version_array = graphene_version.split('.')
graphene_major_version = version_array[0].to_int()
graphene_minor_version = version_array[1].to_int()
graphene_micro_version = version_array[2].to_int()

graphene_api_version = '@0@.0'.format(graphene_major_version)

# The interface age is reset every time we add new API; this
# should only happen during development cycles, otherwise the
# interface age is the same as the micro version
if graphene_minor_version.is_odd()
  graphene_interface_age = 0
else
  graphene_interface_age = graphene_micro_version
endif

graphene_binary_age = 100 * graphene_minor_version + graphene_micro_version

# Maintain compatibility with the previous libtool versioning
soversion = 0
current = graphene_binary_age - graphene_interface_age
revision = graphene_interface_age
libversion = '@0@.@1@.@2@'.format(soversion, current, revision)

darwin_versions = [current + 1, '@0@.@1@'.format(current + 1, revision)]

# Paths
graphene_prefix = get_option('prefix')
graphene_libdir = join_paths(graphene_prefix, get_option('libdir'))
graphene_includedir = join_paths(graphene_prefix, get_option('includedir'))
graphene_datadir = join_paths(graphene_prefix, get_option('datadir'))

graphene_api_path = '@0@-@1@'.format(meson.project_name(), graphene_api_version)

conf = configuration_data()

# Compiler and linker flags
common_cflags = []
common_ldflags = []

if cc.get_id() == 'msvc'
  # Make MSVC more pedantic, this is a recommended pragma list
  # from _Win32_Programming_ by Rector and Newcomer.  Taken from
  # glib's msvc_recommended_pragmas.h--please see that file for
  # the meaning of the warning codes used here
  test_cflags = [
    '-we4002',
    '-we4003',
    '-w14010',
    '-we4013',
    '-w14016',
    '-we4020',
    '-we4021',
    '-we4027',
    '-we4029',
    '-we4033',
    '-we4035',
    '-we4045',
    '-we4047',
    '-we4049',
    '-we4053',
    '-we4071',
    '-we4244',
    '-we4150',
    '-utf-8'
  ]
else
  test_cflags = [
    '-ffast-math',
    '-fstrict-aliasing',
    '-Wpointer-arith',
    '-Wstrict-prototypes',
    '-Wnested-externs',
    '-Wold-style-definition',
    '-Wunused',
    '-Wmissing-noreturn',
    '-Wmissing-format-attribute',
    '-Wlogical-op',
    '-Wcast-align',
    '-Wno-unused-local-typedefs',
    '-Werror=float-conversion',
    '-Werror=float-equal',
    '-Werror=redundant-decls',
    '-Werror=missing-prototypes',
    '-Werror=missing-declarations',
    '-Werror=format=2',
    '-Werror=uninitialized',
    '-Werror=shadow',
    '-Werror=implicit',
    '-Werror=init-self',
    '-Werror=main',
    '-Werror=missing-braces',
    '-Werror=return-type',
    '-Werror=array-bounds',
    '-Werror=write-strings',
    '-Werror=undef',
  ]
endif

common_cflags = cc.get_supported_arguments(test_cflags)

# MSVC: Let C4819 error out if we do not have the -utf-8 compiler flag
if cc.get_id() == 'msvc'
  if not common_cflags.contains('-utf-8')
    common_cflags += cc.get_supported_arguments('-we4819')
  endif
endif

common_ldflags = []
if host_system == 'linux'
  ldflags = [ '-Wl,-Bsymbolic-functions', '-Wl,-z,relro', '-Wl,-z,now', ]
  common_ldflags += cc.get_supported_link_arguments(ldflags)
endif

# Required dependencies
mathlib = cc.find_library('m', required: false)
threadlib = dependency('threads')

# Headers
test_headers = [
  'stdlib.h',
  'stdint.h',
  'stdbool.h',
  'memory.h',
]

foreach h: test_headers
  conf.set('HAVE_' + h.underscorify().to_upper(),
    cc.has_header(h),
    description: 'Define if @0@ is available'.format(h),
  )
endforeach

conf.set('HAVE_PTHREAD_H',
  cc.has_header('pthread.h', dependencies: threadlib),
  description: 'Define if pthread.h is available',
)

# Functions
if cc.has_function('memalign', prefix: '#include <stdlib.h>\n#include <malloc.h>')
  conf.set10('HAVE_MEMALIGN', 1, description: 'Define if memalign() is available')
elif cc.has_function('_aligned_malloc', prefix: '#include <malloc.h>')
  conf.set10('HAVE__ALIGNED_MALLOC', 1, description: 'Define if _aligned_malloc() is available')
# Don't probe the ones below on Windows because when building with
# MinGW-w64 on MSYS2, Meson<0.37.0 incorrectly detects those below as
# being available even though they're not.
elif cc.has_function('aligned_alloc', prefix: '#include <stdlib.h>') and not (host_system == 'windows')
  conf.set10('HAVE_ALIGNED_ALLOC', 1, description: 'Define if aligned_malloc() is available')
elif cc.has_function('posix_memalign', prefix: '#include <stdlib.h>') and not (host_system == 'windows')
  conf.set10('HAVE_POSIX_MEMALIGN', 1, description: 'Define if posix_memalign() is available')
else
  error('No aligned malloc function could be found.')
endif

math_exts = [
  'sincosf',
  'isinff',
  'isnanf',
]

foreach mfunc: math_exts
  conf.set('HAVE_' + mfunc.underscorify().to_upper(),
    cc.has_function(mfunc,
      prefix: '#include <math.h>',
      args: [ '-D_GNU_SOURCE' ],
      dependencies: mathlib,
    ),
    description: 'Define if @0@ is available'.format(mfunc),
  )
endforeach

# Debugging
debug_flags = []
if get_option('debug')
  debug_flags += [ '-DGRAPHENE_ENABLE_DEBUG' ]
  message('Enabling various debug infrastructure')
elif get_option('optimization') in ['2', '3', 's']
  debug_flags += [ '-DG_DISABLE_ASSERT' ]
  message('Disabling assertions')
endif

extra_args = []
# Detect and set symbol visibility
if get_option('default_library') != 'static'
  if host_system == 'windows'
    conf.set('DLL_EXPORT', true)
    conf.set('_GRAPHENE_PUBLIC', '__declspec(dllexport) extern')
    if cc.get_id() != 'msvc'
      extra_args += ['-fvisibility=hidden']
    endif
  else
    conf.set('_GRAPHENE_PUBLIC', '__attribute__((visibility("default"))) extern')
    extra_args += ['-fvisibility=hidden']
  endif
endif

# Optional dependency on GObject
build_gobject = false
gobject_req_version = '>= 2.30.0'
if get_option('gobject_types')
  graphene_gobject_api_path = '@0@-gobject-@1@'.format(meson.project_name(), graphene_api_version)
  # fallback allows us to pick up GObject in case we're a subproject of another
  # project that uses GObject and where GObject comes from a GLib subproject
  # (e.g. when building GStreamer or GTK on Windows).
  gobject = dependency('gobject-2.0',
    version: gobject_req_version,
    required: false,
    fallback: ['glib', 'libgobject_dep']
  )
  build_gobject = gobject.found()
  if build_gobject
    if cc.get_id() == 'msvc'
      extra_args += ['/FImsvc_recommended_pragmas.h']
    endif
  endif
endif

# Optional dependency on GObject-Introspection; if GObject is disabled
# then we don't build introspection data either
build_gir = build_gobject and get_option('introspection') and get_option('default_library') == 'shared'

# Check for InitOnce on Windows
if host_system == 'windows'
  init_once_prog = '''
#define _WIN32_WINNT 0x0600
#include <windows.h>
INIT_ONCE g_InitOnce = INIT_ONCE_STATIC_INIT;
BOOL CALLBACK InitHandleFunc (PINIT_ONCE i, PVOID arg, PVOID *ctx) { return TRUE; }
int main (void) {
  BOOL bInitStatus = InitOnceExecuteOnce (&g_InitOnce, InitHandleFunc, NULL, NULL);
  return 0;
}
'''
  conf.set('HAVE_INIT_ONCE',
    cc.compiles(init_once_prog, name: 'InitOnceExecuteOnce'),
    description: 'Define if InitOnceExecuteOnce is available',
  )
endif

# Configuration for our installed config header
graphene_conf = configuration_data()

# Enabled SIMD implementations
graphene_simd = []

# SSE intrinsics
sse2_cflags = []
if get_option('sse2')
  sse_prog = '''
#if defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9))
# if !defined(__amd64__) && !defined(__x86_64__)
#   error "Need GCC >= 4.9 for SSE2 intrinsics on x86"
# endif
#elif defined (_MSC_VER) && !defined (_M_X64) && !defined (_M_AMD64)
# error "SSE2 intrinsics not supported on x86 MSVC builds"
#endif
#if defined(__SSE__) || (_M_X64 > 0)
# include <mmintrin.h>
# include <xmmintrin.h>
# include <emmintrin.h>
#else
# error "No SSE intrinsics available"
#endif
int main () {
    __m128i a = _mm_set1_epi32 (0), b = _mm_set1_epi32 (0), c;
    c = _mm_xor_si128 (a, b);
    return 0;
}'''
  if cc.get_id() != 'msvc'
    test_sse2_cflags = ['-mfpmath=sse', '-msse', '-msse2']
  else
    test_sse2_cflags = []
  endif

  if cc.compiles(sse_prog, args: test_sse2_cflags, name: 'SSE intrinsics')
    graphene_conf.set('GRAPHENE_HAS_SSE', 1)
    sse2_cflags = test_sse2_cflags
    common_cflags += test_sse2_cflags
    graphene_simd += [ 'sse2' ]
  endif
endif

# GCC vector intrinsics
if get_option('gcc_vector')
  gcc_vector_prog = '''
#if defined(__GNUC__)
# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9)
#   error "GCC vector intrinsics are disabled on GCC prior to 4.9"
# elif defined(__arm__)
#   error "GCC vector intrinsics are disabled on ARM"
# elif !defined(__x86_64__)
#   error "GCC vector intrinsics are disabled on 32bit"
# endif
#else
# error "Need GCC for GCC vectors intrinsics"
#endif
typedef float simd4f __attribute__((vector_size(16)));
typedef int simd4i __attribute__((vector_size(16)));
int main () {
  simd4f s = { 1.f, 2.f, 3.f, 4.f };
  simd4i m = { 0,   1,   1,   3   };
  simd4f r = __builtin_shuffle (s, m);
  return 0;
}'''
  if cc.compiles(gcc_vector_prog, name: 'GCC vector intrinsics')
    graphene_conf.set('GRAPHENE_HAS_GCC', 1)
    graphene_simd += [ 'gcc' ]
  endif
endif

# ARM NEON intrinsics
neon_cflags = []
if get_option('arm_neon')
  neon_prog = '''
#ifndef __ARM_EABI__
#error "EABI is required (to be sure that calling conventions are compatible)"
#endif
#ifndef __ARM_NEON__
#error "No ARM NEON instructions available"
#endif
#include <arm_neon.h>
int main () {
    const float32_t __v[4] = { 1, 2, 3, 4 }; \
    const unsigned int __umask[4] = { \
      0x80000000, \
      0x80000000, \
      0x80000000, \
      0x80000000 \
    }; \
    const uint32x4_t __mask = vld1q_u32 (__umask); \
    float32x4_t s = vld1q_f32 (__v); \
    float32x4_t c = vreinterpretq_f32_u32 (veorq_u32 (vreinterpretq_u32_f32 (s), __mask)); \
    return 0;
}'''
  test_neon_cflags = ['-mfpu=neon']

  if host_system == 'android'
    test_neon_cflags += ['-mfloat-abi=softfp']
  endif

  if cc.compiles(neon_prog, args: test_neon_cflags, name: 'ARM NEON intrinsics')
    graphene_conf.set('GRAPHENE_HAS_ARM_NEON', 1)

    neon_cflags = test_neon_cflags
    common_cflags += test_neon_cflags
    graphene_simd += [ 'neon' ]
  endif
endif

# Scalar is always available as a fallback
graphene_simd += [ 'scalar' ]

python3 = import('python3')
gnome = import('gnome')

subdir('include')

src_inc = include_directories('src')
subdir('src')

if get_option('tests')
  if cc.get_id() == 'msvc' and cc.version().version_compare('<19')
    warning('Tests, specifically the mutest library, cannot be built for pre-2015 Visual Studio builds.')
    warning('Use \'meson configure -Dtests=false\' if you are sure you want to proceed.')
  endif
  subdir('tests')
endif

if get_option('gtk_doc')
  subdir('doc')
endif
