module DirectX9.D3D.X.Misc
where
import DirectX9.Error

import DirectX9.D3D
import DirectX9.D3D.X.Import
import DirectX9.D3D.X.Raw

import Foreign          ( alloca, castPtr, peekArray )
import Foreign.C.String ( withCWString, peekCAString, peekCWString )


type XBuffer = ComObject ID3DXBuffer

withXBufferLen :: XBuffer -> (Int -> Ptr a -> IO b) -> IO b
withXBufferLen buf act = withCom buf
    $ \buf -> do
        ptr <- c_ID3DXBuffer_GetBufferPointer buf
        len <- c_ID3DXBuffer_GetBufferSize buf
        act (fromIntegral len) (castPtr ptr)

withXBuffer :: XBuffer -> (Ptr a -> IO b) -> IO b
withXBuffer buf act = withXBufferLen buf (const act)

{-peekArrayFromXBuffer :: (Storable a) => XBuffer -> IO [a]
peekArrayFromXBuffer buf =
    withXBufferLen buf $ \len content ->
        peekArray (div len size) content
-}

peekCAStringFromXBuffer :: XBuffer -> IO String
peekCAStringFromXBuffer buf = withXBuffer buf peekCAString

peekCWStringFromXBuffer :: XBuffer -> IO String
peekCWStringFromXBuffer buf = withXBuffer buf peekCWString

d3dxMatrixPerspectiveFovLH :: Float -> Float -> Float -> Float -> IO D3DMATRIX
d3dxMatrixPerspectiveFovLH fov aspect zn zf = alloca $ \mat ->
    c_D3DXMatrixPerspectiveFovLH mat fov aspect zn zf >>= peek

d3dxMatrixTranslation :: Float -> Float -> Float -> IO D3DMATRIX
d3dxMatrixTranslation x y z = alloca $ \mat ->
    c_D3DXMatrixTranslation mat x y z >>= peek

d3dxMatrixRotationYawPitchRoll :: Float -> Float -> Float -> IO D3DMATRIX
d3dxMatrixRotationYawPitchRoll y p r = alloca $ \mat ->
    c_D3DXMatrixRotationYawPitchRoll mat y p r >>= peek

d3dxCreateTextureFromFile :: Device -> String -> IO Texture
d3dxCreateTextureFromFile dev name = withCom dev
    $ \dev -> withCWString name
    $ \name -> alloca
    $ \ret -> do
        hrFail "D3DXCreateTextureFromFile" $
            c_D3DXCreateTextureFromFile dev name ret
        peek ret >>= comMake