meson.build

# Copyright © 2017-2020 Intel Corporation

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

project(
  'mesa',
  ['c', 'cpp'],
  version : run_command(
    [find_program('python', 'python3'), 'bin/meson_get_version.py']
  ).stdout(),
  license : 'MIT',
  meson_version : '>= 0.52',
  default_options : ['buildtype=debugoptimized', 'b_ndebug=if-release', 'c_std=c99', 'cpp_std=c++14']
)

cc = meson.get_compiler('c')
cpp = meson.get_compiler('cpp')

null_dep = dependency('', required : false)

if get_option('layout') != 'mirror'
  error('`mirror` is the only build directory layout supported')
endif

# Arguments for the preprocessor, put these in a separate array from the C and
# C++ (cpp in meson terminology) arguments since they need to be added to the
# default arguments for both C and C++.
pre_args = [
  '-D__STDC_CONSTANT_MACROS',
  '-D__STDC_FORMAT_MACROS',
  '-D__STDC_LIMIT_MACROS',
  '-DPACKAGE_VERSION="@0@"'.format(meson.project_version()),
  '-DPACKAGE_BUGREPORT="https://gitlab.freedesktop.org/mesa/mesa/-/issues"',
]

with_vulkan_icd_dir = get_option('vulkan-icd-dir')
with_tests = get_option('build-tests')
with_aco_tests = get_option('build-aco-tests')
with_glx_read_only_text = get_option('glx-read-only-text')
with_glx_direct = get_option('glx-direct')
with_osmesa = get_option('osmesa')
with_swr_arches = get_option('swr-arches')
with_vulkan_overlay_layer = get_option('vulkan-overlay-layer')
with_tools = get_option('tools')
if with_tools.contains('all')
  with_tools = [
    'drm-shim',
    'etnaviv',
    'freedreno',
    'glsl',
    'intel',
    'intel-ui',
    'lima',
    'nir',
    'nouveau',
    'xvmc',
  ]
endif

with_intel_tools = with_tools.contains('intel') or with_tools.contains('intel-ui')
with_imgui = with_intel_tools or with_vulkan_overlay_layer

dri_drivers_path = get_option('dri-drivers-path')
if dri_drivers_path == ''
  dri_drivers_path = join_paths(get_option('prefix'), get_option('libdir'), 'dri')
endif
dri_search_path = get_option('dri-search-path')
if dri_search_path == ''
  dri_search_path = dri_drivers_path
endif

with_gles1 = get_option('gles1')
if with_gles1 == 'true'
  with_gles1 = 'enabled'
  warning('gles1 option "true" deprecated, please use "enabled" instead.')
elif with_gles1 == 'false'
  with_gles1 = 'disabled'
  warning('gles1 option "false" deprecated, please use "disabled" instead.')
endif
with_gles2 = get_option('gles2')
if with_gles2 == 'true'
  with_gles2 = 'enabled'
  warning('gles2 option "true" deprecated, please use "enabled" instead.')
elif with_gles2 == 'false'
  with_gles2 = 'disabled'
  warning('gles2 option "false" deprecated, please use "disabled" instead.')
endif
if host_machine.system() == 'windows'
  if with_gles1 == 'auto'
    with_gles1 = 'disabled'
  endif
  if with_gles2 == 'auto'
    with_gles2 = 'disabled'
  endif
endif
with_opengl = get_option('opengl')

# Default shared glapi off for windows, on elsewhere.
_sg = get_option('shared-glapi')
if _sg == 'true'
  _sg = 'enabled'
  warning('shared-glapi option "true" deprecated, please use "enabled" instead.')
elif _sg == 'false'
  _sg = 'disabled'
  warning('shared-glapi option "false" deprecated, please use "disabled" instead.')
endif
if _sg == 'auto'
  with_shared_glapi = host_machine.system() != 'windows'
else
  with_shared_glapi = _sg == 'enabled'
endif

# shared-glapi is required if at least two OpenGL APIs are being built
if not with_shared_glapi
  if ((with_gles1 == 'enabled' and with_gles2 == 'enabled') or
      (with_gles1 == 'enabled' and with_opengl) or
      (with_gles2 == 'enabled' and with_opengl))
    error('shared-glapi required for building two or more of OpenGL, OpenGL ES 1.x, OpenGL ES 2.x')
  endif
  with_gles1 = 'disabled'
  with_gles2 = 'disabled'
endif

# We require OpenGL for OpenGL ES
if not with_opengl
  if (with_gles1 == 'enabled' or with_gles2 == 'enabled') and not with_opengl
    error('building OpenGL ES without OpenGL is not supported.')
  endif
  with_gles1 = 'disabled'
  with_gles2 = 'disabled'
endif

with_gles1 = with_gles1 != 'disabled'
with_gles2 = with_gles2 != 'disabled'
with_any_opengl = with_opengl or with_gles1 or with_gles2
# Only build shared_glapi if at least one OpenGL API is enabled
with_shared_glapi = with_shared_glapi and with_any_opengl

system_has_kms_drm = ['openbsd', 'netbsd', 'freebsd', 'gnu/kfreebsd', 'dragonfly', 'linux', 'sunos'].contains(host_machine.system())

dri_drivers = get_option('dri-drivers')
if dri_drivers.contains('auto')
  if system_has_kms_drm
    # TODO: PPC, Sparc
    if ['x86', 'x86_64'].contains(host_machine.cpu_family())
      dri_drivers = ['i915', 'i965', 'r100', 'r200', 'nouveau']
    elif ['arm', 'aarch64'].contains(host_machine.cpu_family())
      dri_drivers = []
    else
      error('Unknown architecture @0@. Please pass -Ddri-drivers to set driver options. Patches gladly accepted to fix this.'.format(
            host_machine.cpu_family()))
    endif
  elif ['darwin', 'windows', 'cygwin', 'haiku'].contains(host_machine.system())
    # only swrast would make sense here, but gallium swrast is a much better default
    dri_drivers = []
  else
    error('Unknown OS @0@. Please pass -Ddri-drivers to set driver options. Patches gladly accepted to fix this.'.format(
          host_machine.system()))
  endif
endif

with_dri_i915 = dri_drivers.contains('i915')
with_dri_i965 = dri_drivers.contains('i965')
with_dri_r100 = dri_drivers.contains('r100')
with_dri_r200 = dri_drivers.contains('r200')
with_dri_nouveau = dri_drivers.contains('nouveau')
with_dri_swrast = dri_drivers.contains('swrast')

with_dri = dri_drivers.length() != 0

gallium_drivers = get_option('gallium-drivers')
if gallium_drivers.contains('auto')
  if system_has_kms_drm
    # TODO: PPC, Sparc
    if ['x86', 'x86_64'].contains(host_machine.cpu_family())
      gallium_drivers = [
        'r300', 'r600', 'radeonsi', 'nouveau', 'virgl', 'svga', 'swrast',
        'iris'
      ]
    elif ['arm', 'aarch64'].contains(host_machine.cpu_family())
      gallium_drivers = [
        'kmsro', 'v3d', 'vc4', 'freedreno', 'etnaviv', 'nouveau',
        'tegra', 'virgl', 'lima', 'panfrost', 'swrast'
      ]
    else
      error('Unknown architecture @0@. Please pass -Dgallium-drivers to set driver options. Patches gladly accepted to fix this.'.format(
            host_machine.cpu_family()))
    endif
  elif ['darwin', 'windows', 'cygwin', 'haiku'].contains(host_machine.system())
    gallium_drivers = ['swrast']
  else
    error('Unknown OS @0@. Please pass -Dgallium-drivers to set driver options. Patches gladly accepted to fix this.'.format(
          host_machine.system()))
  endif
endif
with_gallium_kmsro = gallium_drivers.contains('kmsro')
with_gallium_radeonsi = gallium_drivers.contains('radeonsi')
with_gallium_r300 = gallium_drivers.contains('r300')
with_gallium_r600 = gallium_drivers.contains('r600')
with_gallium_nouveau = gallium_drivers.contains('nouveau')
with_gallium_freedreno = gallium_drivers.contains('freedreno')
with_gallium_softpipe = gallium_drivers.contains('swrast')
with_gallium_vc4 = gallium_drivers.contains('vc4')
with_gallium_v3d = gallium_drivers.contains('v3d')
with_gallium_panfrost = gallium_drivers.contains('panfrost')
with_gallium_etnaviv = gallium_drivers.contains('etnaviv')
with_gallium_tegra = gallium_drivers.contains('tegra')
with_gallium_iris = gallium_drivers.contains('iris')
with_gallium_i915 = gallium_drivers.contains('i915')
with_gallium_svga = gallium_drivers.contains('svga')
with_gallium_virgl = gallium_drivers.contains('virgl')
with_gallium_swr = gallium_drivers.contains('swr')
with_gallium_lima = gallium_drivers.contains('lima')
with_gallium_zink = gallium_drivers.contains('zink')

with_gallium = gallium_drivers.length() != 0

if with_gallium and system_has_kms_drm
  _glx = get_option('glx')
  _egl = get_option('egl')
  if _glx == 'dri' or _egl == 'enabled' or (_glx == 'disabled' and _egl != 'disabled')
    with_dri = true
  endif
endif

_vulkan_drivers = get_option('vulkan-drivers')
if _vulkan_drivers.contains('auto')
  if system_has_kms_drm
    if host_machine.cpu_family().startswith('x86')
      _vulkan_drivers = ['amd', 'intel']
    elif ['arm', 'aarch64'].contains(host_machine.cpu_family())
      _vulkan_drivers = []
    else
      error('Unknown architecture @0@. Please pass -Dvulkan-drivers to set driver options. Patches gladly accepted to fix this.'.format(
            host_machine.cpu_family()))
    endif
  elif ['darwin', 'windows', 'cygwin', 'haiku'].contains(host_machine.system())
    # No vulkan driver supports windows or macOS currently
    _vulkan_drivers = []
  else
    error('Unknown OS @0@. Please pass -Dvulkan-drivers to set driver options. Patches gladly accepted to fix this.'.format(
          host_machine.system()))
  endif
endif

with_intel_vk = _vulkan_drivers.contains('intel')
with_amd_vk = _vulkan_drivers.contains('amd')
with_freedreno_vk = _vulkan_drivers.contains('freedreno')
with_any_vk = _vulkan_drivers.length() != 0

if with_dri_swrast and (with_gallium_softpipe or with_gallium_swr)
  error('Only one swrast provider can be built')
endif
if with_dri_i915 and with_gallium_i915
  error('Only one i915 provider can be built')
endif
if with_gallium_kmsro and not (with_gallium_v3d or with_gallium_vc4 or with_gallium_etnaviv or with_gallium_freedreno or with_gallium_panfrost or with_gallium_lima)
  error('kmsro driver requires one or more renderonly drivers (vc4, etnaviv, freedreno, panfrost, lima)')
endif
if with_gallium_tegra and not with_gallium_nouveau
  error('tegra driver requires nouveau driver')
endif
if with_aco_tests and not with_amd_vk
  error('ACO tests require Radv')
endif

if host_machine.system() == 'darwin'
  with_dri_platform = 'apple'
  pre_args += '-DBUILDING_MESA'
elif ['windows', 'cygwin'].contains(host_machine.system())
  with_dri_platform = 'windows'
elif system_has_kms_drm
  with_dri_platform = 'drm'
else
  # FIXME: haiku doesn't use dri, and xlib doesn't use dri, probably should
  # assert here that one of those cases has been met.
  # FIXME: illumos ends up here as well
  with_dri_platform = 'none'
endif

_platforms = get_option('platforms')
if _platforms.contains('auto')
  if system_has_kms_drm
    _platforms = ['x11', 'wayland']
  elif ['darwin', 'cygwin'].contains(host_machine.system())
    _platforms = ['x11']
  elif ['haiku'].contains(host_machine.system())
    _platforms = ['haiku']
  elif host_machine.system() == 'windows'
    _platforms = ['windows']
  else
    error('Unknown OS @0@. Please pass -Dplatforms to set platforms. Patches gladly accepted to fix this.'.format(
          host_machine.system()))
  endif
endif

with_platform_android = _platforms.contains('android')
with_platform_x11 = _platforms.contains('x11')
with_platform_wayland = _platforms.contains('wayland')
with_platform_haiku = _platforms.contains('haiku')
with_platform_windows = _platforms.contains('windows')

if _platforms.contains('surfaceless')
  warning('Platform `surfaceless` is now always selected; setting this option will be an error in Mesa 20.3')
endif

if _platforms.contains('drm')
  warning('Platform `drm` is now automatically selected; setting this option will be an error in Mesa 20.3')
endif

if _platforms.length() != 0
  egl_native_platform = _platforms[0]
else
  egl_native_platform = 'surfaceless'
endif

with_glx = get_option('glx')
if with_glx == 'auto'
  if with_dri
    with_glx = 'dri'
  elif with_platform_haiku
    with_glx = 'disabled'
  elif host_machine.system() == 'windows'
    with_glx = 'disabled'
  elif with_gallium
    # Even when building just gallium drivers the user probably wants dri
    with_glx = 'dri'
  elif with_platform_x11 and with_any_opengl and not with_any_vk
    # The automatic behavior should not be to turn on xlib based glx when
    # building only vulkan drivers
    with_glx = 'xlib'
  else
    with_glx = 'disabled'
  endif
endif
if with_glx == 'dri'
   if with_gallium
      with_dri = true
   endif
endif

if not (with_dri or with_gallium or with_glx != 'disabled')
  with_gles1 = false
  with_gles2 = false
  with_opengl = false
  with_any_opengl = false
  with_shared_glapi = false
endif

_gbm = get_option('gbm')
if _gbm == 'true'
  _gbm = 'enabled'
  warning('gbm option "true" deprecated, please use "enabled" instead.')
elif _gbm == 'false'
  _gbm = 'disabled'
  warning('gbm option "false" deprecated, please use "disabled" instead.')
endif
if _gbm == 'auto'
  with_gbm = system_has_kms_drm and with_dri
else
  with_gbm = _gbm == 'enabled'
endif
if with_gbm and not system_has_kms_drm
  error('GBM only supports DRM/KMS platforms')
endif

_xlib_lease = get_option('xlib-lease')
if _xlib_lease == 'true'
  _xlib_lease = 'enabled'
  warning('xlib_lease option "true" deprecated, please use "enabled" instead.')
elif _xlib_lease == 'false'
  _xlib_lease = 'disabled'
  warning('xlib_lease option "false" deprecated, please use "disabled" instead.')
endif
if _xlib_lease == 'auto'
  with_xlib_lease = with_platform_x11 and system_has_kms_drm
else
  with_xlib_lease = _xlib_lease == 'enabled'
endif

_egl = get_option('egl')
if _egl == 'true'
  _egl = 'enabled'
  warning('egl option "true" deprecated, please use "enabled" instead.')
elif _egl == 'false'
  _egl = 'disabled'
  warning('egl option "false" deprecated, please use "disabled" instead.')
endif
if _egl == 'auto'
  with_egl = (
    not ['darwin', 'windows'].contains(host_machine.system()) and
    with_dri and with_shared_glapi
  )
elif _egl == 'enabled'
  if not with_dri
    error('EGL requires dri')
  elif not with_shared_glapi
    error('EGL requires shared-glapi')
  elif not ['disabled', 'dri'].contains(with_glx)
    error('EGL requires dri, but a GLX is being built without dri')
  elif ['darwin', 'windows'].contains(host_machine.system())
    error('EGL is not available on Windows or MacOS')
  endif
  with_egl = true
else
  with_egl = false
endif

# Android uses emutls for versions <= P/28. For USE_ELF_TLS we need ELF TLS.
use_elf_tls = false
if not ['windows', 'freebsd', 'openbsd'].contains(host_machine.system()) and (not with_platform_android or get_option('platform-sdk-version') >= 29)
  pre_args += '-DUSE_ELF_TLS'
  use_elf_tls = true
endif

if with_glx != 'disabled'
  if not (with_platform_x11 and with_any_opengl)
    error('Cannot build GLX support without X11 platform support and at least one OpenGL API')
  elif with_glx == 'gallium-xlib'
    if not with_gallium
      error('Gallium-xlib based GLX requires at least one gallium driver')
    elif not with_gallium_softpipe
      error('Gallium-xlib based GLX requires softpipe or llvmpipe.')
    elif with_dri
      error('gallium-xlib conflicts with any dri driver')
    endif
  elif with_glx == 'xlib'
    if with_dri
      error('xlib conflicts with any dri driver')
    endif
  elif with_glx == 'dri'
    if not with_shared_glapi
      error('dri based GLX requires shared-glapi')
    endif
  endif
endif

with_glvnd = get_option('glvnd')
if with_glvnd
  if with_platform_windows
    error('glvnd cannot be used on Windows')
  elif with_glx == 'xlib' or with_glx == 'gallium-xlib'
    error('Cannot build glvnd support for GLX that is not DRI based.')
  elif with_glx == 'disabled' and not with_egl
    error('glvnd requires DRI based GLX and/or EGL')
  endif
  if get_option('egl-lib-suffix') != ''
    error('''EGL lib suffix can't be used with libglvnd''')
  endif
endif

if with_vulkan_icd_dir == ''
  with_vulkan_icd_dir = join_paths(get_option('datadir'), 'vulkan/icd.d')
endif

# GNU/Hurd includes egl_dri2, without drm.
with_dri2 = (with_dri or with_any_vk) and (with_dri_platform == 'drm' or
  host_machine.system() == 'gnu')
_dri3 = get_option('dri3')
if _dri3 == 'true'
  _dri3 = 'enabled'
  warning('dri3 option "true" deprecated, please use "enabled" instead.')
elif _dri3 == 'false'
  _dri3 = 'disabled'
  warning('dri3 option "false" deprecated, please use "disabled" instead.')
endif
if _dri3 == 'auto'
  with_dri3 = system_has_kms_drm and with_dri2
else
  with_dri3 = _dri3 == 'enabled'
endif

if with_any_vk and (with_platform_x11 and not with_dri3)
  error('Vulkan drivers require dri3 for X11 support')
endif
if with_dri
  if with_glx == 'disabled' and not with_egl and not with_gbm and with_osmesa != 'classic'
    error('building dri drivers require at least one windowing system or classic osmesa')
  endif
endif

_vdpau = get_option('gallium-vdpau')
if _vdpau == 'true'
  _vdpau = 'enabled'
  warning('gallium-vdpau option "true" deprecated, please use "enabled" instead.')
elif _vdpau == 'false'
  _vdpau = 'disabled'
  warning('gallium-vdpau option "false" deprecated, please use "disabled" instead.')
endif
if not system_has_kms_drm
  if _vdpau == 'enabled'
    error('VDPAU state tracker can only be build on unix-like OSes.')
  else
    _vdpau = 'disabled'
  endif
elif not with_platform_x11
  if _vdpau == 'enabled'
    error('VDPAU state tracker requires X11 support.')
  else
    _vdpau = 'disabled'
  endif
elif not (with_gallium_r300 or with_gallium_r600 or with_gallium_radeonsi or
          with_gallium_nouveau)
  if _vdpau == 'enabled'
    error('VDPAU state tracker requires at least one of the following gallium drivers: r300, r600, radeonsi, nouveau.')
  else
    _vdpau = 'disabled'
  endif
endif
dep_vdpau = null_dep
with_gallium_vdpau = false
if _vdpau != 'disabled'
  dep_vdpau = dependency('vdpau', version : '>= 1.1', required : _vdpau == 'enabled')
  if dep_vdpau.found()
    dep_vdpau = dep_vdpau.partial_dependency(compile_args : true)
    with_gallium_vdpau = true
  endif
endif

if with_gallium_vdpau
  pre_args += '-DHAVE_ST_VDPAU'
endif
vdpau_drivers_path = get_option('vdpau-libs-path')
if vdpau_drivers_path == ''
  vdpau_drivers_path = join_paths(get_option('libdir'), 'vdpau')
endif

if with_gallium_zink
  dep_vulkan = dependency('vulkan')
endif

if with_vulkan_overlay_layer or with_aco_tests
  prog_glslang = find_program('glslangValidator')
endif

_xvmc = get_option('gallium-xvmc')
if _xvmc == 'true'
  _xvmc = 'enabled'
  warning('gallium-xvmc option "true" deprecated, please use "enabled" instead.')
elif _xvmc == 'false'
  _xvmc = 'disabled'
  warning('gallium-xvmc option "false" deprecated, please use "disabled" instead.')
endif
if not system_has_kms_drm
  if _xvmc == 'enabled'
    error('XVMC state tracker can only be build on unix-like OSes.')
  else
    _xvmc = 'disabled'
  endif
elif not with_platform_x11
  if _xvmc == 'enabled'
    error('XVMC state tracker requires X11 support.')
  else
    _xvmc = 'disabled'
  endif
elif not (with_gallium_r600 or with_gallium_nouveau)
  if _xvmc == 'enabled'
    error('XVMC state tracker requires at least one of the following gallium drivers: r600, nouveau.')
  else
    _xvmc = 'disabled'
  endif
endif
dep_xvmc = null_dep
dep_xv = null_dep
with_gallium_xvmc = false
if _xvmc != 'disabled'
  dep_xvmc = dependency('xvmc', version : '>= 1.0.6', required : _xvmc == 'enabled')
  dep_xv = dependency('xv', required : _xvmc == 'enabled')
  with_gallium_xvmc = dep_xvmc.found() and dep_xv.found()
endif

xvmc_drivers_path = get_option('xvmc-libs-path')
if xvmc_drivers_path == ''
  xvmc_drivers_path = get_option('libdir')
endif

_omx = get_option('gallium-omx')
if not system_has_kms_drm
  if ['auto', 'disabled'].contains(_omx)
    _omx = 'disabled'
  else
    error('OMX state tracker can only be built on unix-like OSes.')
  endif
elif not (with_gallium_r600 or with_gallium_radeonsi or with_gallium_nouveau)
  if ['auto', 'disabled'].contains(_omx)
    _omx = 'disabled'
  else
    error('OMX state tracker requires at least one of the following gallium drivers: r600, radeonsi, nouveau.')
  endif
endif
with_gallium_omx = _omx
dep_omx = null_dep
dep_omx_other = []
if ['auto', 'bellagio'].contains(_omx)
  dep_omx = dependency(
    'libomxil-bellagio', required : _omx == 'bellagio'
  )
  if dep_omx.found()
    with_gallium_omx = 'bellagio'
  endif
endif
if ['auto', 'tizonia'].contains(_omx)
  if with_dri and with_egl
    dep_omx = dependency(
      'libtizonia', version : '>= 0.10.0',
      required : _omx == 'tizonia',
    )
    dep_omx_other = [
      dependency('libtizplatform', required : _omx == 'tizonia'),
      dependency('tizilheaders', required : _omx == 'tizonia'),
    ]
    if dep_omx.found() and dep_omx_other[0].found() and dep_omx_other[1].found()
      with_gallium_omx = 'tizonia'
    endif
  elif _omx == 'tizonia'
    error('OMX-Tizonia state tracker requires dri and egl')
  endif
endif
if _omx == 'auto'
  with_gallium_omx = 'disabled'
else
  with_gallium_omx = _omx
endif

pre_args += [
  '-DENABLE_ST_OMX_BELLAGIO=' + (with_gallium_omx == 'bellagio' ? '1' : '0'),
  '-DENABLE_ST_OMX_TIZONIA=' + (with_gallium_omx == 'tizonia' ? '1' : '0'),
]


omx_drivers_path = get_option('omx-libs-path')

if with_gallium_omx != 'disabled'
  # Figure out where to put the omx driver.
  # FIXME: this could all be vastly simplified by adding a 'defined_variable'
  # argument to meson's get_pkgconfig_variable method.
  if omx_drivers_path == ''
    _omx_libdir = dep_omx.get_pkgconfig_variable('libdir')
    _omx_drivers_dir = dep_omx.get_pkgconfig_variable('pluginsdir')
    if _omx_libdir == get_option('libdir')
      omx_drivers_path = _omx_drivers_dir
    else
      _omx_base_dir = []
      # This will fail on windows. Does OMX run on windows?
      _omx_libdir = _omx_libdir.split('/')
      _omx_drivers_dir = _omx_drivers_dir.split('/')
      foreach o : _omx_drivers_dir
        if not _omx_libdir.contains(o)
          _omx_base_dir += o
        endif
      endforeach
      omx_drivers_path = join_paths(get_option('libdir'), _omx_base_dir)
    endif
  endif
endif

_va = get_option('gallium-va')
if _va == 'true'
  _va = 'enabled'
  warning('gallium-va option "true" deprecated, please use "enabled" instead.')
elif _va == 'false'
  _va = 'disabled'
  warning('gallium-va option "false" deprecated, please use "disabled" instead.')
endif
if not system_has_kms_drm
  if _va == 'enabled'
    error('VA state tracker can only be built on unix-like OSes.')
  else
    _va = 'disabled'
  endif
elif not (with_gallium_r600 or with_gallium_radeonsi or with_gallium_nouveau)
  if _va == 'enabled'
    error('VA state tracker requires at least one of the following gallium drivers: r600, radeonsi, nouveau.')
  else
    _va = 'disabled'
  endif
endif
with_gallium_va = false
dep_va = null_dep
if _va != 'disabled'
  dep_va = dependency('libva', version : '>= 0.38.0', required : _va == 'enabled')
  if dep_va.found()
    dep_va_headers = dep_va.partial_dependency(compile_args : true)
    with_gallium_va = true
  endif
endif

va_drivers_path = get_option('va-libs-path')
if va_drivers_path == ''
  va_drivers_path = join_paths(get_option('libdir'), 'dri')
endif

_xa = get_option('gallium-xa')
if _xa == 'true'
  _xa = 'enabled'
  warning('gallium-xa option "true" deprecated, please use "enabled" instead.')
elif _xa == 'false'
  _xa = 'disabled'
  warning('gallium-xa option "false" deprecated, please use "disabled" instead.')
endif
if not system_has_kms_drm
  if _xa == 'enabled'
    error('XA state tracker can only be built on unix-like OSes.')
  else
    _xa = 'disabled'
  endif
elif not (with_gallium_nouveau or with_gallium_freedreno or with_gallium_i915
          or with_gallium_svga)
  if _xa == 'enabled'
    error('XA state tracker requires at least one of the following gallium drivers: nouveau, freedreno, i915, svga.')
  else
    _xa = 'disabled'
  endif
endif
with_gallium_xa = _xa != 'disabled'

d3d_drivers_path = get_option('d3d-drivers-path')
if d3d_drivers_path == ''
  d3d_drivers_path = join_paths(get_option('prefix'), get_option('libdir'), 'd3d')
endif

with_gallium_st_nine =  get_option('gallium-nine')
if with_gallium_st_nine
  if not with_gallium_softpipe
    error('The nine state tracker requires gallium softpipe/llvmpipe.')
  elif not (with_gallium_radeonsi or with_gallium_nouveau or with_gallium_r600
            or with_gallium_r300 or with_gallium_svga or with_gallium_i915
            or with_gallium_iris)
    error('The nine state tracker requires at least one non-swrast gallium driver.')
  endif
  if not with_dri3
    error('Using nine with wine requires dri3')
  endif
endif
_power8 = get_option('power8')
if _power8 == 'true'
  _power8 = 'enabled'
  warning('power8 option "true" deprecated, please use "enabled" instead.')
elif _power8 == 'false'
  _power8 = 'disabled'
  warning('power8 option "false" deprecated, please use "disabled" instead.')
endif
if _power8 != 'disabled'
  # on old versions of meson the cpu family would return as ppc64le on little
  # endian power8, this was changed in 0.48 such that the family would always
  # be ppc64 regardless of endianness, and then the machine.endian() value
  # should be checked. Since we support versions < 0.48 we need to use
  # startswith.
  if host_machine.cpu_family().startswith('ppc64') and host_machine.endian() == 'little'
    if cc.get_id() == 'gcc' and cc.version().version_compare('< 4.8')
      error('Altivec is not supported with gcc version < 4.8.')
    endif
    if cc.compiles('''
        #include <altivec.h>
        int main() {
          vector unsigned char r;
          vector unsigned int v = vec_splat_u32 (1);
          r = __builtin_vec_vgbbd ((vector unsigned char) v);
          return 0;
        }''',
        args : '-mpower8-vector',
        name : 'POWER8 intrinsics')
      pre_args += ['-D_ARCH_PWR8', '-mpower8-vector']
    elif get_option('power8') == 'enabled'
      error('POWER8 intrinsic support required but not found.')
    endif
  endif
endif

_opencl = get_option('gallium-opencl')
if _opencl != 'disabled'
  if not with_gallium
    error('OpenCL Clover implementation requires at least one gallium driver.')
  endif

  dep_clc = dependency('libclc')
  with_gallium_opencl = true
  with_opencl_icd = _opencl == 'icd'

  with_opencl_spirv = get_option('opencl-spirv')
  if with_opencl_spirv
    dep_spirv_tools = dependency('SPIRV-Tools', required : true, version : '>= 2018.0')
    # LLVMSPIRVLib is available at https://github.com/KhronosGroup/SPIRV-LLVM-Translator
    dep_llvmspirvlib = dependency('LLVMSPIRVLib', required : true, version : '>= 0.2.1')
  else
    dep_spirv_tools = null_dep
    dep_llvmspirvlib = null_dep
  endif
else
  dep_clc = null_dep
  dep_spirv_tools = null_dep
  dep_llvmspirvlib = null_dep
  with_gallium_opencl = false
  with_opencl_icd = false
  with_opencl_spirv = false
endif

gl_pkgconfig_c_flags = []
if with_platform_x11
  if with_any_vk or with_egl or (with_glx == 'dri' and with_dri_platform == 'drm')
    pre_args += '-DHAVE_X11_PLATFORM'
  endif
  if with_glx == 'xlib' or with_glx == 'gallium-xlib'
    pre_args += '-DUSE_XSHM'
  else
    pre_args += '-DGLX_INDIRECT_RENDERING'
    if with_glx_direct
      pre_args += '-DGLX_DIRECT_RENDERING'
    endif
    if with_dri_platform == 'drm'
      pre_args += '-DGLX_USE_DRM'
    elif with_dri_platform == 'apple'
      pre_args += '-DGLX_USE_APPLEGL'
    elif with_dri_platform == 'windows'
      pre_args += '-DGLX_USE_WINDOWSGL'
    endif
  endif
else
  pre_args += '-DEGL_NO_X11'
  gl_pkgconfig_c_flags += '-DEGL_NO_X11'
endif
if with_gbm
  pre_args += '-DHAVE_DRM_PLATFORM'
endif

with_android_stub = get_option('android-stub')
if with_android_stub and not with_platform_android
  error('`-D android-stub=true` makes no sense without `-D platforms=android`')
endif

if with_platform_android
  if not with_android_stub
    dep_android = [
      dependency('cutils'),
      dependency('hardware'),
      dependency('sync'),
      dependency('backtrace')
    ]
    if get_option('platform-sdk-version') >= 26
      dep_android += dependency('nativewindow')
    endif
  endif
  pre_args += [
    '-DHAVE_ANDROID_PLATFORM',
    '-DANDROID',
    '-DANDROID_API_LEVEL=' + get_option('platform-sdk-version').to_string()
  ]
endif
if with_platform_haiku
  pre_args += '-DHAVE_HAIKU_PLATFORM'
endif

prog_python = import('python').find_installation('python3')
has_mako = run_command(
  prog_python, '-c',
  '''
from distutils.version import StrictVersion
import mako
assert StrictVersion(mako.__version__) > StrictVersion("0.8.0")
  ''')
if has_mako.returncode() != 0
  error('Python (3.x) mako module >= 0.8.0 required to build mesa.')
endif

if cc.get_id() == 'gcc' and cc.version().version_compare('< 4.4.6')
  error('When using GCC, version 4.4.6 or later is required.')
endif

# Support systems without ETIME (e.g. FreeBSD)
if cc.get_define('ETIME', prefix : '#include <errno.h>') == ''
  pre_args += '-DETIME=ETIMEDOUT'
endif

# Define DEBUG for debug builds only (debugoptimized is not included on this one)
if get_option('buildtype') == 'debug'
  pre_args += '-DDEBUG'
endif

with_shader_cache = false
_shader_cache = get_option('shader-cache')
if _shader_cache == 'true'
  _shader_cache = 'enabled'
  warning('shader_cache option "true" deprecated, please use "enabled" instead.')
elif _shader_cache == 'false'
  _shader_cache = 'disabled'
  warning('shader_cache option "false" deprecated, please use "disabled" instead.')
endif
if _shader_cache != 'disabled'
  if host_machine.system() == 'windows'
    if _shader_cache == 'enabled'
      error('Shader Cache does not currently work on Windows')
    endif
  else
    pre_args += '-DENABLE_SHADER_CACHE'
    with_shader_cache = true
  endif
endif

# Check for GCC style builtins
foreach b : ['bswap32', 'bswap64', 'clz', 'clzll', 'ctz', 'expect', 'ffs',
             'ffsll', 'popcount', 'popcountll', 'unreachable']
  if cc.has_function(b)
    pre_args += '-DHAVE___BUILTIN_@0@'.format(b.to_upper())
  endif
endforeach

# check for GCC __attribute__
_attributes = [
  'const', 'flatten', 'malloc', 'pure', 'unused', 'warn_unused_result',
  'weak', 'format', 'packed', 'returns_nonnull', 'alias', 'noreturn',
]
foreach a : cc.get_supported_function_attributes(_attributes)
  pre_args += '-DHAVE_FUNC_ATTRIBUTE_@0@'.format(a.to_upper())
endforeach
if cc.has_function_attribute('visibility:hidden')
  pre_args += '-DHAVE_FUNC_ATTRIBUTE_VISIBILITY'
endif
if cc.compiles('__uint128_t foo(void) { return 0; }',
               name : '__uint128_t')
  pre_args += '-DHAVE_UINT128'
endif

# TODO: this is very incomplete
if ['linux', 'cygwin', 'gnu', 'freebsd', 'gnu/kfreebsd'].contains(host_machine.system())
  pre_args += '-D_GNU_SOURCE'
elif host_machine.system() == 'sunos'
  pre_args += '-D__EXTENSIONS__'
elif host_machine.system() == 'windows'
  pre_args += [
    '-D_WINDOWS', '-D_WIN32_WINNT=0x0601', '-DWINVER=0x0601',
    '-DPIPE_SUBSYSTEM_WINDOWS_USER',
    '-D_USE_MATH_DEFINES',  # XXX: scons doesn't use this for mingw
  ]
  if cc.get_id() == 'msvc'
    pre_args += [
      '-DVC_EXTRALEAN',
      '-D_CRT_SECURE_NO_WARNINGS',
      '-D_CRT_SECURE_NO_DEPRECATE',
      '-D_SCL_SECURE_NO_WARNINGS',
      '-D_SCL_SECURE_NO_DEPRECATE',
      '-D_ALLOW_KEYWORD_MACROS',
      '-D_HAS_EXCEPTIONS=0', # Tell C++ STL to not use exceptions
    ]
  else
    pre_args += ['-D__MSVCRT_VERSION__=0x0700']
  endif
elif host_machine.system() == 'openbsd'
  pre_args += '-D_ISOC11_SOURCE'
endif

# Check for generic C arguments
c_args = []
c_msvc_compat_args = []
no_override_init_args = []
cpp_args = []
cpp_msvc_compat_args = []
if cc.get_id() == 'msvc'
  foreach a : ['/wd4018',  # signed/unsigned mismatch
               '/wd4056',  # overflow in floating-point constant arithmetic
               '/wd4244',  # conversion from 'type1' to 'type2', possible loss of data
               '/wd4267',  # 'var' : conversion from 'size_t' to 'type', possible loss of data
               '/wd4305',  # trancation from 'type1' to 'type2'
               '/wd4351',  # new behavior: elements of array 'array' will be default initialized
               '/wd4756',  # overflow in constant arithmetic
               '/wd4800',  # forcing value to bool 'true' or 'false' (performance warning)
               '/wd4996',  # disabled deprecated POSIX name warnings
               '/wd4291',  # no matching operator delete found
               '/wd4146',  # unary minus operator applied to unsigned type, result still unsigned
               '/wd4200',  # nonstandard extension used: zero-sized array in struct/union
               '/wd4624',  # destructor was implicitly defined as deleted [from LLVM]
              ]
    if cc.has_argument(a)
      c_args += a
    endif
    if cpp.has_argument(a)
      cpp_args += a
    endif
  endforeach
else
  _trial = [
    '-Werror=implicit-function-declaration',
    '-Werror=missing-prototypes',
    '-Werror=return-type',
    '-Werror=empty-body',
    '-Werror=incompatible-pointer-types',
    '-Werror=int-conversion',
    '-Wimplicit-fallthrough',
    '-Wno-missing-field-initializers',
    '-Wno-format-truncation',
    '-fno-math-errno',
    '-fno-trapping-math',
    '-Qunused-arguments',
    '-fno-common',
  ]
  # MinGW chokes on format specifiers and I can't get it all working
  if not (cc.get_id() == 'gcc' and host_machine.system() == 'windows')
    _trial += ['-Werror=format', '-Wformat-security']
  endif
  foreach a : _trial
    if cc.has_argument(a)
      c_args += a
    endif
  endforeach

  _trial = [
    '-Werror=return-type',
    '-Werror=empty-body',
    '-Wno-non-virtual-dtor',
    '-Wno-missing-field-initializers',
    '-Wno-format-truncation',
    '-fno-math-errno',
    '-fno-trapping-math',
    '-Qunused-arguments',
    # Some classes use custom new operator which zeroes memory, however
    # gcc does aggressive dead-store elimination which threats all writes
    # to the memory before the constructor as "dead stores".
    # For now we disable this optimization.
    '-flifetime-dse=1',
  ]
  # MinGW chokes on format specifiers and I can't get it all working
  if not (cc.get_id() == 'gcc' and host_machine.system() == 'windows')
    _trial += ['-Werror=format', '-Wformat-security']
  endif
  foreach a : _trial
    if cpp.has_argument(a)
      cpp_args += a
    endif
  endforeach

  foreach a : ['-Wno-override-init', '-Wno-initializer-overrides']
    if cc.has_argument(a)
      no_override_init_args += a
    endif
  endforeach

  # Check for C and C++ arguments for MSVC compatibility. These are only used
  # in parts of the mesa code base that need to compile with MSVC, mainly
  # common code
  foreach a : ['-Werror=pointer-arith', '-Werror=vla', '-Werror=gnu-empty-initializer']
    if cc.has_argument(a)
      c_msvc_compat_args += a
    endif
    if cpp.has_argument(a)
      cpp_msvc_compat_args += a
    endif
  endforeach

  if cc.has_argument('-Wmicrosoft-enum-value')  # Clang
    c_args += '-Wno-microsoft-enum-value'
    cpp_args += '-Wno-microsoft-enum-value'
  endif
endif

# set linker arguments
if host_machine.system() == 'windows'
  if cc.get_id() == 'msvc'
    add_project_link_arguments(
      '/fixed:no',
      '/dynamicbase',
      '/nxcompat',
      language : ['c', 'cpp'],
    )
    if get_option('buildtype') != 'debug'
      add_project_link_arguments(
        '/incremental:no',
        language : ['c', 'cpp'],
      )
    endif
  else
    add_project_link_arguments(
      '-Wl,--nxcompat',