{-# language CPP #-}
module Vulkan.Core10.Enums.AttachmentLoadOp  (AttachmentLoadOp( ATTACHMENT_LOAD_OP_LOAD
                                                              , ATTACHMENT_LOAD_OP_CLEAR
                                                              , ATTACHMENT_LOAD_OP_DONT_CARE
                                                              , ..
                                                              )) where

import GHC.Read (choose)
import GHC.Read (expectP)
import GHC.Read (parens)
import GHC.Show (showParen)
import GHC.Show (showString)
import GHC.Show (showsPrec)
import Text.ParserCombinators.ReadPrec ((+++))
import Text.ParserCombinators.ReadPrec (prec)
import Text.ParserCombinators.ReadPrec (step)
import Foreign.Storable (Storable)
import Data.Int (Int32)
import GHC.Read (Read(readPrec))
import Text.Read.Lex (Lexeme(Ident))
import Vulkan.Zero (Zero)
-- | VkAttachmentLoadOp - Specify how contents of an attachment are treated
-- at the beginning of a subpass
--
-- = See Also
--
-- 'Vulkan.Core10.Pass.AttachmentDescription',
-- 'Vulkan.Core12.Promoted_From_VK_KHR_create_renderpass2.AttachmentDescription2'
newtype AttachmentLoadOp = AttachmentLoadOp Int32
  deriving newtype (Eq, Ord, Storable, Zero)

-- | 'ATTACHMENT_LOAD_OP_LOAD' specifies that the previous contents of the
-- image within the render area will be preserved. For attachments with a
-- depth\/stencil format, this uses the access type
-- 'Vulkan.Core10.Enums.AccessFlagBits.ACCESS_DEPTH_STENCIL_ATTACHMENT_READ_BIT'.
-- For attachments with a color format, this uses the access type
-- 'Vulkan.Core10.Enums.AccessFlagBits.ACCESS_COLOR_ATTACHMENT_READ_BIT'.
pattern ATTACHMENT_LOAD_OP_LOAD = AttachmentLoadOp 0
-- | 'ATTACHMENT_LOAD_OP_CLEAR' specifies that the contents within the render
-- area will be cleared to a uniform value, which is specified when a
-- render pass instance is begun. For attachments with a depth\/stencil
-- format, this uses the access type
-- 'Vulkan.Core10.Enums.AccessFlagBits.ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT'.
-- For attachments with a color format, this uses the access type
-- 'Vulkan.Core10.Enums.AccessFlagBits.ACCESS_COLOR_ATTACHMENT_WRITE_BIT'.
pattern ATTACHMENT_LOAD_OP_CLEAR = AttachmentLoadOp 1
-- | 'ATTACHMENT_LOAD_OP_DONT_CARE' specifies that the previous contents
-- within the area need not be preserved; the contents of the attachment
-- will be undefined inside the render area. For attachments with a
-- depth\/stencil format, this uses the access type
-- 'Vulkan.Core10.Enums.AccessFlagBits.ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT'.
-- For attachments with a color format, this uses the access type
-- 'Vulkan.Core10.Enums.AccessFlagBits.ACCESS_COLOR_ATTACHMENT_WRITE_BIT'.
pattern ATTACHMENT_LOAD_OP_DONT_CARE = AttachmentLoadOp 2
{-# complete ATTACHMENT_LOAD_OP_LOAD,
             ATTACHMENT_LOAD_OP_CLEAR,
             ATTACHMENT_LOAD_OP_DONT_CARE :: AttachmentLoadOp #-}

instance Show AttachmentLoadOp where
  showsPrec p = \case
    ATTACHMENT_LOAD_OP_LOAD -> showString "ATTACHMENT_LOAD_OP_LOAD"
    ATTACHMENT_LOAD_OP_CLEAR -> showString "ATTACHMENT_LOAD_OP_CLEAR"
    ATTACHMENT_LOAD_OP_DONT_CARE -> showString "ATTACHMENT_LOAD_OP_DONT_CARE"
    AttachmentLoadOp x -> showParen (p >= 11) (showString "AttachmentLoadOp " . showsPrec 11 x)

instance Read AttachmentLoadOp where
  readPrec = parens (choose [("ATTACHMENT_LOAD_OP_LOAD", pure ATTACHMENT_LOAD_OP_LOAD)
                            , ("ATTACHMENT_LOAD_OP_CLEAR", pure ATTACHMENT_LOAD_OP_CLEAR)
                            , ("ATTACHMENT_LOAD_OP_DONT_CARE", pure ATTACHMENT_LOAD_OP_DONT_CARE)]
                     +++
                     prec 10 (do
                       expectP (Ident "AttachmentLoadOp")
                       v <- step readPrec
                       pure (AttachmentLoadOp v)))