module Render.ShadowMap.Pipeline
  ( Settings(..)
  , defaults

  , Pipeline
  , allocate

  , Config
  , config

  , stageCode
  , stageSpirv
  ) where

import RIO

import Control.Monad.Trans.Resource (ResourceT)
import Data.Tagged (Tagged(..))
import Geomancy (Transform)
import Vulkan.Core10 qualified as Vk

import Engine.Vulkan.Pipeline.Graphics qualified as Graphics
import Engine.Vulkan.Types (HasVulkan, HasRenderPass(..), DsBindings)
import Render.Code (compileVert)
import Render.DescSets.Set0 (vertexPos, instanceTransform)
import Render.DescSets.Sun (Sun)
import Render.ShadowMap.Code qualified as Code

type Pipeline = Graphics.Pipeline '[Sun] () Transform
type Config = Graphics.Configure Pipeline
type instance Graphics.Specialization Pipeline = ()

data Settings = Settings
  { Settings -> CullModeFlagBits
cull      :: Vk.CullModeFlagBits
  , Settings -> Maybe (Float, Float)
depthBias :: Maybe (Float, Float)
  }

defaults :: Settings
defaults :: Settings
defaults = Settings :: CullModeFlagBits -> Maybe (Float, Float) -> Settings
Settings
  { $sel:cull:Settings :: CullModeFlagBits
cull      = CullModeFlagBits
Vk.CULL_MODE_BACK_BIT
  , $sel:depthBias:Settings :: Maybe (Float, Float)
depthBias = (Float, Float) -> Maybe (Float, Float)
forall a. a -> Maybe a
Just (Float
2.0, Float
2.5)
  }

allocate
  :: ( HasVulkan env
     , HasRenderPass renderpass
     )
  => Tagged Sun DsBindings
  -> renderpass
  -> Settings
  -> ResourceT (RIO env) Pipeline
allocate :: forall env renderpass.
(HasVulkan env, HasRenderPass renderpass) =>
Tagged Sun DsBindings
-> renderpass -> Settings -> ResourceT (RIO env) Pipeline
allocate Tagged Sun DsBindings
tset0 renderpass
rp Settings
settings = do
  (ReleaseKey
_, Pipeline
p) <- Maybe Extent2D
-> SampleCountFlagBits
-> Config '[Sun] () Transform ()
-> renderpass
-> ResourceT (RIO env) (ReleaseKey, Pipeline)
forall config pipeline (dsl :: [*]) vertices instances spec env
       (m :: * -> *) renderpass.
(config ~ Configure pipeline,
 pipeline ~ Pipeline dsl vertices instances,
 spec ~ Specialization pipeline, Specialization spec, HasCallStack,
 MonadVulkan env m, MonadResource m, HasRenderPass renderpass) =>
Maybe Extent2D
-> SampleCountFlagBits
-> Config dsl vertices instances spec
-> renderpass
-> m (ReleaseKey, pipeline)
Graphics.allocate
    Maybe Extent2D
forall a. Maybe a
Nothing
    SampleCountFlagBits
Vk.SAMPLE_COUNT_1_BIT
    (Tagged Sun DsBindings -> Settings -> Configure Pipeline
config Tagged Sun DsBindings
tset0 Settings
settings)
    renderpass
rp
  Pipeline -> ResourceT (RIO env) Pipeline
forall (f :: * -> *) a. Applicative f => a -> f a
pure Pipeline
p

config :: Tagged Sun DsBindings -> Settings -> Config
config :: Tagged Sun DsBindings -> Settings -> Configure Pipeline
config (Tagged DsBindings
set0) Settings{Maybe (Float, Float)
CullModeFlagBits
depthBias :: Maybe (Float, Float)
cull :: CullModeFlagBits
$sel:depthBias:Settings :: Settings -> Maybe (Float, Float)
$sel:cull:Settings :: Settings -> CullModeFlagBits
..} = Config '[] Any Any ()
forall vertices instances. Config '[] vertices instances ()
Graphics.baseConfig
  { $sel:cDescLayouts:Config :: Tagged '[Sun] [DsBindings]
Graphics.cDescLayouts  = forall {s :: [*]} {b}. b -> Tagged s b
forall {k} (s :: k) b. b -> Tagged s b
Tagged @'[Sun] [DsBindings
set0]
  , $sel:cStages:Config :: StageSpirv
Graphics.cStages       = StageSpirv
stageSpirv
  , $sel:cVertexInput:Config :: SomeStruct PipelineVertexInputStateCreateInfo
Graphics.cVertexInput  = SomeStruct PipelineVertexInputStateCreateInfo
vertexInput
  , $sel:cDepthBias:Config :: Maybe (Float, Float)
Graphics.cDepthBias    = Maybe (Float, Float)
depthBias
  , $sel:cCull:Config :: CullModeFlagBits
Graphics.cCull         = CullModeFlagBits
cull
  }
  where
    vertexInput :: SomeStruct PipelineVertexInputStateCreateInfo
vertexInput = [(VertexInputRate, [Format])]
-> SomeStruct PipelineVertexInputStateCreateInfo
Graphics.vertexInput
      [ (VertexInputRate, [Format])
vertexPos
      , (VertexInputRate, [Format])
instanceTransform
      ]

stageSpirv :: Graphics.StageSpirv
stageSpirv :: StageSpirv
stageSpirv = ("vert" ::: ByteString) -> StageSpirv
forall a. ("vert" ::: a) -> Stages (Maybe ("vert" ::: a))
Graphics.vertexOnly "vert" ::: ByteString
vertSpirv

vertSpirv :: ByteString
vertSpirv :: "vert" ::: ByteString
vertSpirv = $(compileVert Code.vert)

stageCode :: Graphics.StageCode
stageCode :: StageCode
stageCode = ("vert" ::: Code) -> StageCode
forall a. ("vert" ::: a) -> Stages (Maybe ("vert" ::: a))
Graphics.vertexOnly "vert" ::: Code
Code.vert