{-# language CPP #-}
module Graphics.Vulkan.Extensions.VK_EXT_headless_surface  ( createHeadlessSurfaceEXT
                                                           , HeadlessSurfaceCreateInfoEXT(..)
                                                           , HeadlessSurfaceCreateFlagsEXT(..)
                                                           , EXT_HEADLESS_SURFACE_SPEC_VERSION
                                                           , pattern EXT_HEADLESS_SURFACE_SPEC_VERSION
                                                           , EXT_HEADLESS_SURFACE_EXTENSION_NAME
                                                           , pattern EXT_HEADLESS_SURFACE_EXTENSION_NAME
                                                           , SurfaceKHR(..)
                                                           ) where

import Control.Exception.Base (bracket)
import Control.Monad.IO.Class (liftIO)
import Foreign.Marshal.Alloc (allocaBytesAligned)
import Foreign.Marshal.Alloc (callocBytes)
import Foreign.Marshal.Alloc (free)
import GHC.Base (when)
import GHC.IO (throwIO)
import Foreign.Ptr (nullPtr)
import Foreign.Ptr (plusPtr)
import GHC.Read (choose)
import GHC.Read (expectP)
import GHC.Read (parens)
import GHC.Show (showParen)
import GHC.Show (showString)
import Numeric (showHex)
import Text.ParserCombinators.ReadPrec ((+++))
import Text.ParserCombinators.ReadPrec (prec)
import Text.ParserCombinators.ReadPrec (step)
import Control.Monad.Trans.Class (lift)
import Control.Monad.Trans.Cont (evalContT)
import Control.Monad.IO.Class (MonadIO)
import Data.Bits (Bits)
import Data.String (IsString)
import Data.Typeable (Typeable)
import Foreign.Storable (Storable)
import Foreign.Storable (Storable(peek))
import Foreign.Storable (Storable(poke))
import qualified Foreign.Storable (Storable(..))
import Foreign.Ptr (FunPtr)
import Foreign.Ptr (Ptr)
import GHC.Read (Read(readPrec))
import Text.Read.Lex (Lexeme(Ident))
import Data.Kind (Type)
import Control.Monad.Trans.Cont (ContT(..))
import Graphics.Vulkan.NamedType ((:::))
import Graphics.Vulkan.Core10.AllocationCallbacks (AllocationCallbacks)
import Graphics.Vulkan.Core10.BaseType (Flags)
import Graphics.Vulkan.CStruct (FromCStruct)
import Graphics.Vulkan.CStruct (FromCStruct(..))
import Graphics.Vulkan.Core10.Handles (Instance)
import Graphics.Vulkan.Core10.Handles (Instance(..))
import Graphics.Vulkan.Dynamic (InstanceCmds(pVkCreateHeadlessSurfaceEXT))
import Graphics.Vulkan.Core10.Handles (Instance_T)
import Graphics.Vulkan.Core10.Enums.Result (Result)
import Graphics.Vulkan.Core10.Enums.Result (Result(..))
import Graphics.Vulkan.Core10.Enums.StructureType (StructureType)
import Graphics.Vulkan.Extensions.Handles (SurfaceKHR)
import Graphics.Vulkan.Extensions.Handles (SurfaceKHR(..))
import Graphics.Vulkan.CStruct (ToCStruct)
import Graphics.Vulkan.CStruct (ToCStruct(..))
import Graphics.Vulkan.Exception (VulkanException(..))
import Graphics.Vulkan.Zero (Zero)
import Graphics.Vulkan.Zero (Zero(..))
import Graphics.Vulkan.Core10.Enums.StructureType (StructureType(STRUCTURE_TYPE_HEADLESS_SURFACE_CREATE_INFO_EXT))
import Graphics.Vulkan.Core10.Enums.Result (Result(SUCCESS))
import Graphics.Vulkan.Extensions.Handles (SurfaceKHR(..))
foreign import ccall
#if !defined(SAFE_FOREIGN_CALLS)
  unsafe
#endif
  "dynamic" mkVkCreateHeadlessSurfaceEXT
  :: FunPtr (Ptr Instance_T -> Ptr HeadlessSurfaceCreateInfoEXT -> Ptr AllocationCallbacks -> Ptr SurfaceKHR -> IO Result) -> Ptr Instance_T -> Ptr HeadlessSurfaceCreateInfoEXT -> Ptr AllocationCallbacks -> Ptr SurfaceKHR -> IO Result

-- | vkCreateHeadlessSurfaceEXT - Create a headless
-- 'Graphics.Vulkan.Extensions.Handles.SurfaceKHR' object
--
-- = Parameters
--
-- -   @instance@ is the instance to associate the surface with.
--
-- -   @pCreateInfo@ is a pointer to a 'HeadlessSurfaceCreateInfoEXT'
--     structure containing parameters affecting the creation of the
--     surface object.
--
-- -   @pAllocator@ is the allocator used for host memory allocated for the
--     surface object when there is no more specific allocator available
--     (see
--     <https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/vkspec.html#memory-allocation Memory Allocation>).
--
-- -   @pSurface@ is a pointer to a
--     'Graphics.Vulkan.Extensions.Handles.SurfaceKHR' handle in which the
--     created surface object is returned.
--
-- == Valid Usage (Implicit)
--
-- -   @instance@ /must/ be a valid
--     'Graphics.Vulkan.Core10.Handles.Instance' handle
--
-- -   @pCreateInfo@ /must/ be a valid pointer to a valid
--     'HeadlessSurfaceCreateInfoEXT' structure
--
-- -   If @pAllocator@ is not @NULL@, @pAllocator@ /must/ be a valid
--     pointer to a valid
--     'Graphics.Vulkan.Core10.AllocationCallbacks.AllocationCallbacks'
--     structure
--
-- -   @pSurface@ /must/ be a valid pointer to a
--     'Graphics.Vulkan.Extensions.Handles.SurfaceKHR' handle
--
-- == Return Codes
--
-- [<https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/vkspec.html#fundamentals-successcodes Success>]
--
--     -   'Graphics.Vulkan.Core10.Enums.Result.SUCCESS'
--
-- [<https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/vkspec.html#fundamentals-errorcodes Failure>]
--
--     -   'Graphics.Vulkan.Core10.Enums.Result.ERROR_OUT_OF_HOST_MEMORY'
--
--     -   'Graphics.Vulkan.Core10.Enums.Result.ERROR_OUT_OF_DEVICE_MEMORY'
--
-- = See Also
--
-- 'Graphics.Vulkan.Core10.AllocationCallbacks.AllocationCallbacks',
-- 'HeadlessSurfaceCreateInfoEXT',
-- 'Graphics.Vulkan.Core10.Handles.Instance',
-- 'Graphics.Vulkan.Extensions.Handles.SurfaceKHR'
createHeadlessSurfaceEXT :: forall io . MonadIO io => Instance -> HeadlessSurfaceCreateInfoEXT -> ("allocator" ::: Maybe AllocationCallbacks) -> io (SurfaceKHR)
createHeadlessSurfaceEXT instance' createInfo allocator = liftIO . evalContT $ do
  let vkCreateHeadlessSurfaceEXT' = mkVkCreateHeadlessSurfaceEXT (pVkCreateHeadlessSurfaceEXT (instanceCmds (instance' :: Instance)))
  pCreateInfo <- ContT $ withCStruct (createInfo)
  pAllocator <- case (allocator) of
    Nothing -> pure nullPtr
    Just j -> ContT $ withCStruct (j)
  pPSurface <- ContT $ bracket (callocBytes @SurfaceKHR 8) free
  r <- lift $ vkCreateHeadlessSurfaceEXT' (instanceHandle (instance')) pCreateInfo pAllocator (pPSurface)
  lift $ when (r < SUCCESS) (throwIO (VulkanException r))
  pSurface <- lift $ peek @SurfaceKHR pPSurface
  pure $ (pSurface)


-- | VkHeadlessSurfaceCreateInfoEXT - Structure specifying parameters of a
-- newly created headless surface object
--
-- == Valid Usage (Implicit)
--
-- = See Also
--
-- 'HeadlessSurfaceCreateFlagsEXT',
-- 'Graphics.Vulkan.Core10.Enums.StructureType.StructureType',
-- 'createHeadlessSurfaceEXT'
data HeadlessSurfaceCreateInfoEXT = HeadlessSurfaceCreateInfoEXT
  { -- | @flags@ /must/ be @0@
    flags :: HeadlessSurfaceCreateFlagsEXT }
  deriving (Typeable)
deriving instance Show HeadlessSurfaceCreateInfoEXT

instance ToCStruct HeadlessSurfaceCreateInfoEXT where
  withCStruct x f = allocaBytesAligned 24 8 $ \p -> pokeCStruct p x (f p)
  pokeCStruct p HeadlessSurfaceCreateInfoEXT{..} f = do
    poke ((p `plusPtr` 0 :: Ptr StructureType)) (STRUCTURE_TYPE_HEADLESS_SURFACE_CREATE_INFO_EXT)
    poke ((p `plusPtr` 8 :: Ptr (Ptr ()))) (nullPtr)
    poke ((p `plusPtr` 16 :: Ptr HeadlessSurfaceCreateFlagsEXT)) (flags)
    f
  cStructSize = 24
  cStructAlignment = 8
  pokeZeroCStruct p f = do
    poke ((p `plusPtr` 0 :: Ptr StructureType)) (STRUCTURE_TYPE_HEADLESS_SURFACE_CREATE_INFO_EXT)
    poke ((p `plusPtr` 8 :: Ptr (Ptr ()))) (nullPtr)
    f

instance FromCStruct HeadlessSurfaceCreateInfoEXT where
  peekCStruct p = do
    flags <- peek @HeadlessSurfaceCreateFlagsEXT ((p `plusPtr` 16 :: Ptr HeadlessSurfaceCreateFlagsEXT))
    pure $ HeadlessSurfaceCreateInfoEXT
             flags

instance Storable HeadlessSurfaceCreateInfoEXT where
  sizeOf ~_ = 24
  alignment ~_ = 8
  peek = peekCStruct
  poke ptr poked = pokeCStruct ptr poked (pure ())

instance Zero HeadlessSurfaceCreateInfoEXT where
  zero = HeadlessSurfaceCreateInfoEXT
           zero


-- No documentation found for TopLevel "VkHeadlessSurfaceCreateFlagsEXT"
newtype HeadlessSurfaceCreateFlagsEXT = HeadlessSurfaceCreateFlagsEXT Flags
  deriving newtype (Eq, Ord, Storable, Zero, Bits)



instance Show HeadlessSurfaceCreateFlagsEXT where
  showsPrec p = \case
    HeadlessSurfaceCreateFlagsEXT x -> showParen (p >= 11) (showString "HeadlessSurfaceCreateFlagsEXT 0x" . showHex x)

instance Read HeadlessSurfaceCreateFlagsEXT where
  readPrec = parens (choose []
                     +++
                     prec 10 (do
                       expectP (Ident "HeadlessSurfaceCreateFlagsEXT")
                       v <- step readPrec
                       pure (HeadlessSurfaceCreateFlagsEXT v)))


type EXT_HEADLESS_SURFACE_SPEC_VERSION = 1

-- No documentation found for TopLevel "VK_EXT_HEADLESS_SURFACE_SPEC_VERSION"
pattern EXT_HEADLESS_SURFACE_SPEC_VERSION :: forall a . Integral a => a
pattern EXT_HEADLESS_SURFACE_SPEC_VERSION = 1


type EXT_HEADLESS_SURFACE_EXTENSION_NAME = "VK_EXT_headless_surface"

-- No documentation found for TopLevel "VK_EXT_HEADLESS_SURFACE_EXTENSION_NAME"
pattern EXT_HEADLESS_SURFACE_EXTENSION_NAME :: forall a . (Eq a, IsString a) => a
pattern EXT_HEADLESS_SURFACE_EXTENSION_NAME = "VK_EXT_headless_surface"