module Graphics.LambdaCube.Texture where

import Graphics.LambdaCube.Types
import Graphics.LambdaCube.PixelFormat
import Graphics.LambdaCube.HardwareBuffer


-- | Enum identifying the texture usage
data TextureUsage
    = TextureUsage
    { tuUsage           :: Usage
    , tuAutoMipmap      :: Bool     -- ^ mipmaps will be automatically generated for this texture
    , tuRenderTarget    :: Bool     -- ^ this texture will be a render target, i.e. used as a target for render to texture
                                    --   setting this flag will ignore all other texture usages except TU_AUTOMIPMAP
    }
    deriving Eq
{-
enum TextureUsage
{
	/// @copydoc HardwareBuffer::Usage
	TU_STATIC = HardwareBuffer::HBU_STATIC,
	TU_DYNAMIC = HardwareBuffer::HBU_DYNAMIC,
	TU_WRITE_ONLY = HardwareBuffer::HBU_WRITE_ONLY,
	TU_STATIC_WRITE_ONLY = HardwareBuffer::HBU_STATIC_WRITE_ONLY, 
	TU_DYNAMIC_WRITE_ONLY = HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY,
	TU_DYNAMIC_WRITE_ONLY_DISCARDABLE = HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY_DISCARDABLE,
	/// mipmaps will be automatically generated for this texture
	TU_AUTOMIPMAP = 0x100,
	/// this texture will be a render target, i.e. used as a target for render to texture
	/// setting this flag will ignore all other texture usages except TU_AUTOMIPMAP
	TU_RENDERTARGET = 0x200,
	/// default to automatic mipmap generation static textures
	TU_DEFAULT = TU_AUTOMIPMAP | TU_STATIC_WRITE_ONLY
    
};
-}

-- | Enum identifying the texture type
data TextureType
    = TEX_TYPE_1D       -- ^ 1D texture, used in combination with 1D texture coordinates
    | TEX_TYPE_2D       -- ^ 2D texture, used in combination with 2D texture coordinates (default)
    | TEX_TYPE_3D       -- ^ 3D volume texture, used in combination with 3D texture coordinates
    | TEX_TYPE_CUBE_MAP -- ^ 3D cube map, used in combination with 3D texture coordinates
    deriving (Eq,Show)

-- | Enum identifying special mipmap numbers
data TextureMipmap
    = MIP_UNLIMITED -- ^ Generate mipmaps up to 1x1
    | MIP_DEFAULT   -- ^ Use TextureManager default
    | MIP_NUMBER Int
    deriving Eq

class (Eq a, HardwareBuffer a) => Texture a where
    txName                      :: a -> String
    txWidth                     :: a -> Int
    txHeight                    :: a -> Int
    txDepth                     :: a -> Int
    txNumRequestedMipmaps       :: a -> TextureMipmap
    txNumMipmaps                :: a -> Int
    txMipmapsHardwareGenerated  :: a -> Bool
    txGamma                     :: a -> FloatType
    txHwGamma                   :: a -> Bool
    txFSAA                      :: a -> Int
    txFSAAHint                  :: a -> String
    txTextureType               :: a -> TextureType
    txFormat                    :: a -> PixelFormat

    --txUsage                     :: a -> TextureUsage
    txAutoMipmap                :: a -> Bool    -- ^ mipmaps will be automatically generated for this texture
    txRenderTarget              :: a -> Bool    -- ^ this texture will be a render target, i.e. used as a target for render to texture
                                                --   setting this flag will ignore all other texture usages except TU_AUTOMIPMAP

    txSrcFormat                 :: a -> PixelFormat
    txSrcWidth                  :: a -> Int
    txSrcHeight                 :: a -> Int
    txSrcDepth                  :: a -> Int

    txDesiredFormat             :: a -> PixelFormat
    txDesiredIntegerBitDepth    :: a -> Int
    txDesiredFloatBitDepth      :: a -> Int
    txTreatLuminanceAsAlpha     :: a -> Bool