{-# OPTIONS_GHC -fplugin Foreign.Storable.Generic.Plugin #-}

{-# LANGUAGE DeriveAnyClass #-}

module Render.Font.EvanwSdf.Model
  ( InstanceAttrs(..)
  ) where

import RIO

import Foreign.Storable.Generic (GStorable)
import Geomancy (Vec4)
import Vulkan.Core10 qualified as Vk

import Engine.Vulkan.Format (HasVkFormat(..))
import Engine.Vulkan.Pipeline.Graphics (HasVertexInputBindings(..), instanceFormat)

data InstanceAttrs = InstanceAttrs
  { vertRect     :: Vec4
  , fragRect     :: Vec4
  , color        :: Vec4
  , outlineColor :: Vec4

  , samplerId    :: Int32
  , textureId    :: Int32

  , smoothing    :: Float
  , outlineWidth :: Float
  }
  deriving (Eq, Show, Generic)

-- XXX: Fine, the layout matches
instance GStorable InstanceAttrs

instance HasVkFormat InstanceAttrs where
  getVkFormat =
    [ Vk.FORMAT_R32G32B32A32_SFLOAT -- Quad scale+offset
    , Vk.FORMAT_R32G32B32A32_SFLOAT -- UV scale+offset
    , Vk.FORMAT_R32G32B32A32_SFLOAT -- Color
    , Vk.FORMAT_R32G32B32A32_SFLOAT -- Outline color

    , Vk.FORMAT_R32G32_SINT         -- Sampler + texture IDs
    , Vk.FORMAT_R32G32_SFLOAT       -- Smoothing + outline width
    ]

instance HasVertexInputBindings InstanceAttrs where
  vertexInputBindings = [instanceFormat @InstanceAttrs]