{-# language CPP #-}
module Vulkan.Core10.Enums.ComponentSwizzle  (ComponentSwizzle( COMPONENT_SWIZZLE_IDENTITY
                                                              , COMPONENT_SWIZZLE_ZERO
                                                              , COMPONENT_SWIZZLE_ONE
                                                              , COMPONENT_SWIZZLE_R
                                                              , COMPONENT_SWIZZLE_G
                                                              , COMPONENT_SWIZZLE_B
                                                              , COMPONENT_SWIZZLE_A
                                                              , ..
                                                              )) 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)
-- | VkComponentSwizzle - Specify how a component is swizzled
--
-- = Description
--
-- Setting the identity swizzle on a component is equivalent to setting the
-- identity mapping on that component. That is:
--
-- +-----------------------------------+-----------------------------------+
-- | Component                         | Identity Mapping                  |
-- +===================================+===================================+
-- | @components.r@                    | 'COMPONENT_SWIZZLE_R'             |
-- +-----------------------------------+-----------------------------------+
-- | @components.g@                    | 'COMPONENT_SWIZZLE_G'             |
-- +-----------------------------------+-----------------------------------+
-- | @components.b@                    | 'COMPONENT_SWIZZLE_B'             |
-- +-----------------------------------+-----------------------------------+
-- | @components.a@                    | 'COMPONENT_SWIZZLE_A'             |
-- +-----------------------------------+-----------------------------------+
--
-- Component Mappings Equivalent To 'COMPONENT_SWIZZLE_IDENTITY'
--
-- = See Also
--
-- 'Vulkan.Core10.ImageView.ComponentMapping'
newtype ComponentSwizzle = ComponentSwizzle Int32
  deriving newtype (Eq, Ord, Storable, Zero)

-- | 'COMPONENT_SWIZZLE_IDENTITY' specifies that the component is set to the
-- identity swizzle.
pattern COMPONENT_SWIZZLE_IDENTITY = ComponentSwizzle 0
-- | 'COMPONENT_SWIZZLE_ZERO' specifies that the component is set to zero.
pattern COMPONENT_SWIZZLE_ZERO = ComponentSwizzle 1
-- | 'COMPONENT_SWIZZLE_ONE' specifies that the component is set to either 1
-- or 1.0, depending on whether the type of the image view format is
-- integer or floating-point respectively, as determined by the
-- <https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/vkspec.html#formats-definition Format Definition>
-- section for each 'Vulkan.Core10.Enums.Format.Format'.
pattern COMPONENT_SWIZZLE_ONE = ComponentSwizzle 2
-- | 'COMPONENT_SWIZZLE_R' specifies that the component is set to the value
-- of the R component of the image.
pattern COMPONENT_SWIZZLE_R = ComponentSwizzle 3
-- | 'COMPONENT_SWIZZLE_G' specifies that the component is set to the value
-- of the G component of the image.
pattern COMPONENT_SWIZZLE_G = ComponentSwizzle 4
-- | 'COMPONENT_SWIZZLE_B' specifies that the component is set to the value
-- of the B component of the image.
pattern COMPONENT_SWIZZLE_B = ComponentSwizzle 5
-- | 'COMPONENT_SWIZZLE_A' specifies that the component is set to the value
-- of the A component of the image.
pattern COMPONENT_SWIZZLE_A = ComponentSwizzle 6
{-# complete COMPONENT_SWIZZLE_IDENTITY,
             COMPONENT_SWIZZLE_ZERO,
             COMPONENT_SWIZZLE_ONE,
             COMPONENT_SWIZZLE_R,
             COMPONENT_SWIZZLE_G,
             COMPONENT_SWIZZLE_B,
             COMPONENT_SWIZZLE_A :: ComponentSwizzle #-}

instance Show ComponentSwizzle where
  showsPrec p = \case
    COMPONENT_SWIZZLE_IDENTITY -> showString "COMPONENT_SWIZZLE_IDENTITY"
    COMPONENT_SWIZZLE_ZERO -> showString "COMPONENT_SWIZZLE_ZERO"
    COMPONENT_SWIZZLE_ONE -> showString "COMPONENT_SWIZZLE_ONE"
    COMPONENT_SWIZZLE_R -> showString "COMPONENT_SWIZZLE_R"
    COMPONENT_SWIZZLE_G -> showString "COMPONENT_SWIZZLE_G"
    COMPONENT_SWIZZLE_B -> showString "COMPONENT_SWIZZLE_B"
    COMPONENT_SWIZZLE_A -> showString "COMPONENT_SWIZZLE_A"
    ComponentSwizzle x -> showParen (p >= 11) (showString "ComponentSwizzle " . showsPrec 11 x)

instance Read ComponentSwizzle where
  readPrec = parens (choose [("COMPONENT_SWIZZLE_IDENTITY", pure COMPONENT_SWIZZLE_IDENTITY)
                            , ("COMPONENT_SWIZZLE_ZERO", pure COMPONENT_SWIZZLE_ZERO)
                            , ("COMPONENT_SWIZZLE_ONE", pure COMPONENT_SWIZZLE_ONE)
                            , ("COMPONENT_SWIZZLE_R", pure COMPONENT_SWIZZLE_R)
                            , ("COMPONENT_SWIZZLE_G", pure COMPONENT_SWIZZLE_G)
                            , ("COMPONENT_SWIZZLE_B", pure COMPONENT_SWIZZLE_B)
                            , ("COMPONENT_SWIZZLE_A", pure COMPONENT_SWIZZLE_A)]
                     +++
                     prec 10 (do
                       expectP (Ident "ComponentSwizzle")
                       v <- step readPrec
                       pure (ComponentSwizzle v)))