module Graphics.D3D11Binding 
( module Graphics.D3D11Binding.Enums
, module Graphics.D3D11Binding.Types
, module Graphics.D3D11Binding.Interface
, module Graphics.D3D11Binding.Shader
, module Graphics.D3D11Binding.GUID
, module Graphics.D3D11Binding.Utils
, module Graphics.D3D11Binding.Math
, d3d11CreateDeviceAndSwapChain
, createDDSTextureFromFile
) where

import Data.Word

import Foreign.Ptr

import Graphics.Win32

import Graphics.D3D11Binding.Enums
import Graphics.D3D11Binding.Types
import Graphics.D3D11Binding.Interface
import Graphics.D3D11Binding.Shader
import Graphics.D3D11Binding.GUID
import Graphics.D3D11Binding.Utils
import Graphics.D3D11Binding.Math

import Foreign.Marshal.Array
import Foreign.Marshal.Alloc
import Foreign.Storable
import Foreign.C.String

type PIDxgiAdapter = Ptr IDxgiAdapter
type PD3DFeatureLevel = Ptr D3DFeatureLevel
type PDxgiSwapChainDesc = Ptr DxgiSwapChainDesc
type PIDxgiSwapChain = Ptr IDxgiSwapChain
type PID3D11Device = Ptr ID3D11Device
type PID3D11DeviceContext = Ptr ID3D11DeviceContext

d3d11SdkVersion :: Word32
d3d11SdkVersion = 7

foreign import stdcall "D3D11CreateDeviceAndSwapChain" c_d3d11CreateDeviceAndSwapChain
  :: PIDxgiAdapter -> Word32 -> HMODULE -> Word32 ->
     PD3DFeatureLevel -> Word32 -> Word32 -> PDxgiSwapChainDesc ->
     Ptr PIDxgiSwapChain -> Ptr PID3D11Device -> Ptr D3DFeatureLevel ->
     Ptr PID3D11DeviceContext -> IO HRESULT
     
d3d11CreateDeviceAndSwapChain 
  :: PIDxgiAdapter -> D3DDriverType -> HMODULE -> 
     [D3D11CreateDeviceFlag] -> [D3DFeatureLevel] -> DxgiSwapChainDesc -> 
     IO (Either HRESULT (PIDxgiSwapChain, PID3D11Device, D3DFeatureLevel, PID3D11DeviceContext))
d3d11CreateDeviceAndSwapChain adapter driverType software flags featureLevels swapChainDesc = do
  featureArray <- newArray featureLevels
  let flagSum = createDeviceFlag flags
  alloca $ \swapChain -> alloca $ \device -> alloca $ \feature -> alloca $ \context -> alloca $ \sd -> do
    poke sd swapChainDesc
    hr <- c_d3d11CreateDeviceAndSwapChain
            adapter
            (fromIntegral $ fromEnum driverType)
            software
            flagSum
            featureArray
            (fromIntegral $ length featureLevels)
            d3d11SdkVersion
            sd
            swapChain
            device
            feature
            context
    if hr < 0 then return (Left hr) 
    else do
      peekSwapChain <- peek swapChain
      peekDevice <- peek device
      peekFeature <- peek feature
      peekContext <- peek context
      return $ Right (peekSwapChain, peekDevice, peekFeature, peekContext)
      
foreign import stdcall "CreateDDSTextureFromFile" c_createDDSTextureFromFile
  :: Ptr ID3D11Device -> CWString -> Ptr (Ptr ID3D11Resource) -> 
     Ptr (Ptr ID3D11ShaderResourceView) -> Word32 -> Ptr DDSAlphaMode -> IO HRESULT
  
createDDSTextureFromFile :: Ptr ID3D11Device -> String -> IO (Either HRESULT (Ptr ID3D11ShaderResourceView))
createDDSTextureFromFile device fileName = 
  alloca $ \pResource -> withCWString fileName $ \wFileName ->  do
    hr <- c_createDDSTextureFromFile device wFileName nullPtr pResource 0 nullPtr
    if hr < 0 then do 
      print hr 
      return (Left hr)
    else Right <$> peek pResource