{-# language CPP #-}
-- | = Name
--
-- VK_NV_framebuffer_mixed_samples - device extension
--
-- == VK_NV_framebuffer_mixed_samples
--
-- [__Name String__]
--     @VK_NV_framebuffer_mixed_samples@
--
-- [__Extension Type__]
--     Device extension
--
-- [__Registered Extension Number__]
--     153
--
-- [__Revision__]
--     1
--
-- [__Extension and Version Dependencies__]
--
--     -   Requires Vulkan 1.0
--
-- [__Contact__]
--
--     -   Jeff Bolz
--         <https://github.com/KhronosGroup/Vulkan-Docs/issues/new?body=[VK_NV_framebuffer_mixed_samples] @jeffbolznv%0A<<Here describe the issue or question you have about the VK_NV_framebuffer_mixed_samples extension>> >
--
-- == Other Extension Metadata
--
-- [__Last Modified Date__]
--     2017-06-04
--
-- [__Contributors__]
--
--     -   Jeff Bolz, NVIDIA
--
-- == Description
--
-- This extension allows multisample rendering with a raster and
-- depth\/stencil sample count that is larger than the color sample count.
-- Rasterization and the results of the depth and stencil tests together
-- determine the portion of a pixel that is “covered”. It can be useful to
-- evaluate coverage at a higher frequency than color samples are stored.
-- This coverage is then “reduced” to a collection of covered color
-- samples, each having an opacity value corresponding to the fraction of
-- the color sample covered. The opacity can optionally be blended into
-- individual color samples.
--
-- Rendering with fewer color samples than depth\/stencil samples greatly
-- reduces the amount of memory and bandwidth consumed by the color buffer.
-- However, converting the coverage values into opacity introduces
-- artifacts where triangles share edges and /may/ not be suitable for
-- normal triangle mesh rendering.
--
-- One expected use case for this functionality is Stencil-then-Cover path
-- rendering (similar to the OpenGL GL_NV_path_rendering extension). The
-- stencil step determines the coverage (in the stencil buffer) for an
-- entire path at the higher sample frequency, and then the cover step
-- draws the path into the lower frequency color buffer using the coverage
-- information to antialias path edges. With this two-step process,
-- internal edges are fully covered when antialiasing is applied and there
-- is no corruption on these edges.
--
-- The key features of this extension are:
--
-- -   It allows render pass and framebuffer objects to be created where
--     the number of samples in the depth\/stencil attachment in a subpass
--     is a multiple of the number of samples in the color attachments in
--     the subpass.
--
-- -   A coverage reduction step is added to Fragment Operations which
--     converts a set of covered raster\/depth\/stencil samples to a set of
--     color samples that perform blending and color writes. The coverage
--     reduction step also includes an optional coverage modulation step,
--     multiplying color values by a fractional opacity corresponding to
--     the number of associated raster\/depth\/stencil samples covered.
--
-- == New Structures
--
-- -   Extending
--     'Vulkan.Core10.Pipeline.PipelineMultisampleStateCreateInfo':
--
--     -   'PipelineCoverageModulationStateCreateInfoNV'
--
-- == New Enums
--
-- -   'CoverageModulationModeNV'
--
-- == New Bitmasks
--
-- -   'PipelineCoverageModulationStateCreateFlagsNV'
--
-- == New Enum Constants
--
-- -   'NV_FRAMEBUFFER_MIXED_SAMPLES_EXTENSION_NAME'
--
-- -   'NV_FRAMEBUFFER_MIXED_SAMPLES_SPEC_VERSION'
--
-- -   Extending 'Vulkan.Core10.Enums.StructureType.StructureType':
--
--     -   'Vulkan.Core10.Enums.StructureType.STRUCTURE_TYPE_PIPELINE_COVERAGE_MODULATION_STATE_CREATE_INFO_NV'
--
-- == Version History
--
-- -   Revision 1, 2017-06-04 (Jeff Bolz)
--
--     -   Internal revisions
--
-- == See Also
--
-- 'CoverageModulationModeNV',
-- 'PipelineCoverageModulationStateCreateFlagsNV',
-- 'PipelineCoverageModulationStateCreateInfoNV'
--
-- == Document Notes
--
-- For more information, see the
-- <https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/vkspec.html#VK_NV_framebuffer_mixed_samples Vulkan Specification>
--
-- This page is a generated document. Fixes and changes should be made to
-- the generator scripts, not directly.
module Vulkan.Extensions.VK_NV_framebuffer_mixed_samples  ( PipelineCoverageModulationStateCreateInfoNV(..)
                                                          , PipelineCoverageModulationStateCreateFlagsNV(..)
                                                          , CoverageModulationModeNV( COVERAGE_MODULATION_MODE_NONE_NV
                                                                                    , COVERAGE_MODULATION_MODE_RGB_NV
                                                                                    , COVERAGE_MODULATION_MODE_ALPHA_NV
                                                                                    , COVERAGE_MODULATION_MODE_RGBA_NV
                                                                                    , ..
                                                                                    )
                                                          , NV_FRAMEBUFFER_MIXED_SAMPLES_SPEC_VERSION
                                                          , pattern NV_FRAMEBUFFER_MIXED_SAMPLES_SPEC_VERSION
                                                          , NV_FRAMEBUFFER_MIXED_SAMPLES_EXTENSION_NAME
                                                          , pattern NV_FRAMEBUFFER_MIXED_SAMPLES_EXTENSION_NAME
                                                          ) where

import Vulkan.Internal.Utils (enumReadPrec)
import Vulkan.Internal.Utils (enumShowsPrec)
import Control.Monad (unless)
import Foreign.Marshal.Alloc (allocaBytes)
import GHC.IO (throwIO)
import Foreign.Ptr (nullPtr)
import Foreign.Ptr (plusPtr)
import GHC.Show (showString)
import GHC.Show (showsPrec)
import Numeric (showHex)
import Data.Coerce (coerce)
import Control.Monad.Trans.Class (lift)
import Control.Monad.Trans.Cont (evalContT)
import Data.Vector (generateM)
import qualified Data.Vector (imapM_)
import qualified Data.Vector (length)
import qualified Data.Vector (null)
import Vulkan.CStruct (FromCStruct)
import Vulkan.CStruct (FromCStruct(..))
import Vulkan.CStruct (ToCStruct)
import Vulkan.CStruct (ToCStruct(..))
import Vulkan.Zero (Zero)
import Vulkan.Zero (Zero(..))
import Data.Bits (Bits)
import Data.Bits (FiniteBits)
import Data.String (IsString)
import Data.Typeable (Typeable)
import Foreign.C.Types (CFloat)
import Foreign.C.Types (CFloat(..))
import Foreign.C.Types (CFloat(CFloat))
import Foreign.Storable (Storable)
import Foreign.Storable (Storable(peek))
import Foreign.Storable (Storable(poke))
import GHC.Generics (Generic)
import GHC.IO.Exception (IOErrorType(..))
import GHC.IO.Exception (IOException(..))
import Data.Int (Int32)
import Foreign.Ptr (Ptr)
import GHC.Read (Read(readPrec))
import GHC.Show (Show(showsPrec))
import Data.Word (Word32)
import Data.Kind (Type)
import Control.Monad.Trans.Cont (ContT(..))
import Data.Vector (Vector)
import Vulkan.CStruct.Utils (advancePtrBytes)
import Vulkan.Core10.FundamentalTypes (bool32ToBool)
import Vulkan.Core10.FundamentalTypes (boolToBool32)
import Vulkan.Core10.FundamentalTypes (Bool32)
import Vulkan.Core10.FundamentalTypes (Flags)
import Vulkan.Core10.Enums.StructureType (StructureType)
import Vulkan.Core10.Enums.StructureType (StructureType(STRUCTURE_TYPE_PIPELINE_COVERAGE_MODULATION_STATE_CREATE_INFO_NV))
-- | VkPipelineCoverageModulationStateCreateInfoNV - Structure specifying
-- parameters controlling coverage modulation
--
-- = Description
--
-- If @coverageModulationTableEnable@ is
-- 'Vulkan.Core10.FundamentalTypes.FALSE', then for each color sample the
-- associated bits of the pixel coverage are counted and divided by the
-- number of associated bits to produce a modulation factor R in the range
-- (0,1] (a value of zero would have been killed due to a color coverage of
-- 0). Specifically:
--
-- -   N = value of @rasterizationSamples@
--
-- -   M = value of 'Vulkan.Core10.Pass.AttachmentDescription'::@samples@
--     for any color attachments
--
-- -   R = popcount(associated coverage bits) \/ (N \/ M)
--
-- If @coverageModulationTableEnable@ is
-- 'Vulkan.Core10.FundamentalTypes.TRUE', the value R is computed using a
-- programmable lookup table. The lookup table has N \/ M elements, and the
-- element of the table is selected by:
--
-- -   R = @pCoverageModulationTable@[popcount(associated coverage bits)-1]
--
-- Note that the table does not have an entry for popcount(associated
-- coverage bits) = 0, because such samples would have been killed.
--
-- The values of @pCoverageModulationTable@ /may/ be rounded to an
-- implementation-dependent precision, which is at least as fine as 1 \/ N,
-- and clamped to [0,1].
--
-- For each color attachment with a floating point or normalized color
-- format, each fragment output color value is replicated to M values which
-- /can/ each be modulated (multiplied) by that color sample’s associated
-- value of R. Which components are modulated is controlled by
-- @coverageModulationMode@.
--
-- If this structure is not included in the @pNext@ chain, it is as if
-- @coverageModulationMode@ is 'COVERAGE_MODULATION_MODE_NONE_NV'.
--
-- If the
-- <https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/vkspec.html#fragops-coverage-reduction coverage reduction mode>
-- is
-- 'Vulkan.Extensions.VK_NV_coverage_reduction_mode.COVERAGE_REDUCTION_MODE_TRUNCATE_NV',
-- each color sample is associated with only a single coverage sample. In
-- this case, it is as if @coverageModulationMode@ is
-- 'COVERAGE_MODULATION_MODE_NONE_NV'.
--
-- == Valid Usage
--
-- -   #VUID-VkPipelineCoverageModulationStateCreateInfoNV-coverageModulationTableEnable-01405#
--     If @coverageModulationTableEnable@ is
--     'Vulkan.Core10.FundamentalTypes.TRUE',
--     @coverageModulationTableCount@ /must/ be equal to the number of
--     rasterization samples divided by the number of color samples in the
--     subpass
--
-- == Valid Usage (Implicit)
--
-- -   #VUID-VkPipelineCoverageModulationStateCreateInfoNV-sType-sType#
--     @sType@ /must/ be
--     'Vulkan.Core10.Enums.StructureType.STRUCTURE_TYPE_PIPELINE_COVERAGE_MODULATION_STATE_CREATE_INFO_NV'
--
-- -   #VUID-VkPipelineCoverageModulationStateCreateInfoNV-flags-zerobitmask#
--     @flags@ /must/ be @0@
--
-- -   #VUID-VkPipelineCoverageModulationStateCreateInfoNV-coverageModulationMode-parameter#
--     @coverageModulationMode@ /must/ be a valid
--     'CoverageModulationModeNV' value
--
-- = See Also
--
-- <https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/vkspec.html#VK_NV_framebuffer_mixed_samples VK_NV_framebuffer_mixed_samples>,
-- 'Vulkan.Core10.FundamentalTypes.Bool32', 'CoverageModulationModeNV',
-- 'PipelineCoverageModulationStateCreateFlagsNV',
-- 'Vulkan.Core10.Enums.StructureType.StructureType'
data PipelineCoverageModulationStateCreateInfoNV = PipelineCoverageModulationStateCreateInfoNV
  { -- | @flags@ is reserved for future use.
    flags :: PipelineCoverageModulationStateCreateFlagsNV
  , -- | @coverageModulationMode@ is a 'CoverageModulationModeNV' value
    -- controlling which color components are modulated.
    coverageModulationMode :: CoverageModulationModeNV
  , -- | @coverageModulationTableEnable@ controls whether the modulation factor
    -- is looked up from a table in @pCoverageModulationTable@.
    coverageModulationTableEnable :: Bool
  , -- | @coverageModulationTableCount@ is the number of elements in
    -- @pCoverageModulationTable@.
    coverageModulationTableCount :: Word32
  , -- | @pCoverageModulationTable@ is a table of modulation factors containing a
    -- value for each number of covered samples.
    coverageModulationTable :: Vector Float
  }
  deriving (Typeable)
#if defined(GENERIC_INSTANCES)
deriving instance Generic (PipelineCoverageModulationStateCreateInfoNV)
#endif
deriving instance Show PipelineCoverageModulationStateCreateInfoNV

instance ToCStruct PipelineCoverageModulationStateCreateInfoNV where
  withCStruct x f = allocaBytes 40 $ \p -> pokeCStruct p x (f p)
  pokeCStruct p PipelineCoverageModulationStateCreateInfoNV{..} f = evalContT $ do
    lift $ poke ((p `plusPtr` 0 :: Ptr StructureType)) (STRUCTURE_TYPE_PIPELINE_COVERAGE_MODULATION_STATE_CREATE_INFO_NV)
    lift $ poke ((p `plusPtr` 8 :: Ptr (Ptr ()))) (nullPtr)
    lift $ poke ((p `plusPtr` 16 :: Ptr PipelineCoverageModulationStateCreateFlagsNV)) (flags)
    lift $ poke ((p `plusPtr` 20 :: Ptr CoverageModulationModeNV)) (coverageModulationMode)
    lift $ poke ((p `plusPtr` 24 :: Ptr Bool32)) (boolToBool32 (coverageModulationTableEnable))
    let pCoverageModulationTableLength = Data.Vector.length $ (coverageModulationTable)
    coverageModulationTableCount'' <- lift $ if (coverageModulationTableCount) == 0
      then pure $ fromIntegral pCoverageModulationTableLength
      else do
        unless (fromIntegral pCoverageModulationTableLength == (coverageModulationTableCount) || pCoverageModulationTableLength == 0) $
          throwIO $ IOError Nothing InvalidArgument "" "pCoverageModulationTable must be empty or have 'coverageModulationTableCount' elements" Nothing Nothing
        pure (coverageModulationTableCount)
    lift $ poke ((p `plusPtr` 28 :: Ptr Word32)) (coverageModulationTableCount'')
    pCoverageModulationTable'' <- if Data.Vector.null (coverageModulationTable)
      then pure nullPtr
      else do
        pPCoverageModulationTable <- ContT $ allocaBytes @CFloat (((Data.Vector.length (coverageModulationTable))) * 4)
        lift $ Data.Vector.imapM_ (\i e -> poke (pPCoverageModulationTable `plusPtr` (4 * (i)) :: Ptr CFloat) (CFloat (e))) ((coverageModulationTable))
        pure $ pPCoverageModulationTable
    lift $ poke ((p `plusPtr` 32 :: Ptr (Ptr CFloat))) pCoverageModulationTable''
    lift $ f
  cStructSize = 40
  cStructAlignment = 8
  pokeZeroCStruct p f = do
    poke ((p `plusPtr` 0 :: Ptr StructureType)) (STRUCTURE_TYPE_PIPELINE_COVERAGE_MODULATION_STATE_CREATE_INFO_NV)
    poke ((p `plusPtr` 8 :: Ptr (Ptr ()))) (nullPtr)
    poke ((p `plusPtr` 20 :: Ptr CoverageModulationModeNV)) (zero)
    poke ((p `plusPtr` 24 :: Ptr Bool32)) (boolToBool32 (zero))
    f

instance FromCStruct PipelineCoverageModulationStateCreateInfoNV where
  peekCStruct p = do
    flags <- peek @PipelineCoverageModulationStateCreateFlagsNV ((p `plusPtr` 16 :: Ptr PipelineCoverageModulationStateCreateFlagsNV))
    coverageModulationMode <- peek @CoverageModulationModeNV ((p `plusPtr` 20 :: Ptr CoverageModulationModeNV))
    coverageModulationTableEnable <- peek @Bool32 ((p `plusPtr` 24 :: Ptr Bool32))
    coverageModulationTableCount <- peek @Word32 ((p `plusPtr` 28 :: Ptr Word32))
    pCoverageModulationTable <- peek @(Ptr CFloat) ((p `plusPtr` 32 :: Ptr (Ptr CFloat)))
    let pCoverageModulationTableLength = if pCoverageModulationTable == nullPtr then 0 else (fromIntegral coverageModulationTableCount)
    pCoverageModulationTable' <- generateM pCoverageModulationTableLength (\i -> do
      pCoverageModulationTableElem <- peek @CFloat ((pCoverageModulationTable `advancePtrBytes` (4 * (i)) :: Ptr CFloat))
      pure $ coerce @CFloat @Float pCoverageModulationTableElem)
    pure $ PipelineCoverageModulationStateCreateInfoNV
             flags coverageModulationMode (bool32ToBool coverageModulationTableEnable) coverageModulationTableCount pCoverageModulationTable'

instance Zero PipelineCoverageModulationStateCreateInfoNV where
  zero = PipelineCoverageModulationStateCreateInfoNV
           zero
           zero
           zero
           zero
           mempty


-- | VkPipelineCoverageModulationStateCreateFlagsNV - Reserved for future use
--
-- = Description
--
-- 'PipelineCoverageModulationStateCreateFlagsNV' is a bitmask type for
-- setting a mask, but is currently reserved for future use.
--
-- = See Also
--
-- <https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/vkspec.html#VK_NV_framebuffer_mixed_samples VK_NV_framebuffer_mixed_samples>,
-- 'PipelineCoverageModulationStateCreateInfoNV'
newtype PipelineCoverageModulationStateCreateFlagsNV = PipelineCoverageModulationStateCreateFlagsNV Flags
  deriving newtype (Eq, Ord, Storable, Zero, Bits, FiniteBits)



conNamePipelineCoverageModulationStateCreateFlagsNV :: String
conNamePipelineCoverageModulationStateCreateFlagsNV = "PipelineCoverageModulationStateCreateFlagsNV"

enumPrefixPipelineCoverageModulationStateCreateFlagsNV :: String
enumPrefixPipelineCoverageModulationStateCreateFlagsNV = ""

showTablePipelineCoverageModulationStateCreateFlagsNV :: [(PipelineCoverageModulationStateCreateFlagsNV, String)]
showTablePipelineCoverageModulationStateCreateFlagsNV = []

instance Show PipelineCoverageModulationStateCreateFlagsNV where
  showsPrec = enumShowsPrec enumPrefixPipelineCoverageModulationStateCreateFlagsNV
                            showTablePipelineCoverageModulationStateCreateFlagsNV
                            conNamePipelineCoverageModulationStateCreateFlagsNV
                            (\(PipelineCoverageModulationStateCreateFlagsNV x) -> x)
                            (\x -> showString "0x" . showHex x)

instance Read PipelineCoverageModulationStateCreateFlagsNV where
  readPrec = enumReadPrec enumPrefixPipelineCoverageModulationStateCreateFlagsNV
                          showTablePipelineCoverageModulationStateCreateFlagsNV
                          conNamePipelineCoverageModulationStateCreateFlagsNV
                          PipelineCoverageModulationStateCreateFlagsNV


-- | VkCoverageModulationModeNV - Specify the coverage modulation mode
--
-- = See Also
--
-- <https://www.khronos.org/registry/vulkan/specs/1.2-extensions/html/vkspec.html#VK_NV_framebuffer_mixed_samples VK_NV_framebuffer_mixed_samples>,
-- 'PipelineCoverageModulationStateCreateInfoNV'
newtype CoverageModulationModeNV = CoverageModulationModeNV Int32
  deriving newtype (Eq, Ord, Storable, Zero)

-- | 'COVERAGE_MODULATION_MODE_NONE_NV' specifies that no components are
-- multiplied by the modulation factor.
pattern COVERAGE_MODULATION_MODE_NONE_NV  = CoverageModulationModeNV 0
-- | 'COVERAGE_MODULATION_MODE_RGB_NV' specifies that the red, green, and
-- blue components are multiplied by the modulation factor.
pattern COVERAGE_MODULATION_MODE_RGB_NV   = CoverageModulationModeNV 1
-- | 'COVERAGE_MODULATION_MODE_ALPHA_NV' specifies that the alpha component
-- is multiplied by the modulation factor.
pattern COVERAGE_MODULATION_MODE_ALPHA_NV = CoverageModulationModeNV 2
-- | 'COVERAGE_MODULATION_MODE_RGBA_NV' specifies that all components are
-- multiplied by the modulation factor.
pattern COVERAGE_MODULATION_MODE_RGBA_NV  = CoverageModulationModeNV 3
{-# complete COVERAGE_MODULATION_MODE_NONE_NV,
             COVERAGE_MODULATION_MODE_RGB_NV,
             COVERAGE_MODULATION_MODE_ALPHA_NV,
             COVERAGE_MODULATION_MODE_RGBA_NV :: CoverageModulationModeNV #-}

conNameCoverageModulationModeNV :: String
conNameCoverageModulationModeNV = "CoverageModulationModeNV"

enumPrefixCoverageModulationModeNV :: String
enumPrefixCoverageModulationModeNV = "COVERAGE_MODULATION_MODE_"

showTableCoverageModulationModeNV :: [(CoverageModulationModeNV, String)]
showTableCoverageModulationModeNV =
  [ (COVERAGE_MODULATION_MODE_NONE_NV , "NONE_NV")
  , (COVERAGE_MODULATION_MODE_RGB_NV  , "RGB_NV")
  , (COVERAGE_MODULATION_MODE_ALPHA_NV, "ALPHA_NV")
  , (COVERAGE_MODULATION_MODE_RGBA_NV , "RGBA_NV")
  ]

instance Show CoverageModulationModeNV where
  showsPrec = enumShowsPrec enumPrefixCoverageModulationModeNV
                            showTableCoverageModulationModeNV
                            conNameCoverageModulationModeNV
                            (\(CoverageModulationModeNV x) -> x)
                            (showsPrec 11)

instance Read CoverageModulationModeNV where
  readPrec = enumReadPrec enumPrefixCoverageModulationModeNV
                          showTableCoverageModulationModeNV
                          conNameCoverageModulationModeNV
                          CoverageModulationModeNV


type NV_FRAMEBUFFER_MIXED_SAMPLES_SPEC_VERSION = 1

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


type NV_FRAMEBUFFER_MIXED_SAMPLES_EXTENSION_NAME = "VK_NV_framebuffer_mixed_samples"

-- No documentation found for TopLevel "VK_NV_FRAMEBUFFER_MIXED_SAMPLES_EXTENSION_NAME"
pattern NV_FRAMEBUFFER_MIXED_SAMPLES_EXTENSION_NAME :: forall a . (Eq a, IsString a) => a
pattern NV_FRAMEBUFFER_MIXED_SAMPLES_EXTENSION_NAME = "VK_NV_framebuffer_mixed_samples"