--------------------------------------------------------------------------------
-- |
-- Module      :  Graphics.Rendering.OpenGL.GLU.Initialization
-- Copyright   :  (c) Sven Panne 2002-2019
-- License     :  BSD3
-- 
-- Maintainer  :  Sven Panne <svenpanne@gmail.com>
-- Stability   :  stable
-- Portability :  portable
--
-- This module corresponds to chapter 2 (Initialization) of the GLU specs.
--
--------------------------------------------------------------------------------

module Graphics.Rendering.OpenGL.GLU.Initialization (
   gluVersion, gluExtensions
) where

import Data.StateVar
import Graphics.GLU
import Graphics.Rendering.OpenGL.GL.ByteString
import Graphics.GL

--------------------------------------------------------------------------------

gluVersion :: GettableStateVar String
gluVersion :: GettableStateVar String
gluVersion = GettableStateVar String -> GettableStateVar String
forall a. IO a -> IO a
makeGettableStateVar (GLenum -> GettableStateVar String
getString GLenum
GLU_VERSION)

gluExtensions :: GettableStateVar [String]
gluExtensions :: GettableStateVar [String]
gluExtensions = GettableStateVar [String] -> GettableStateVar [String]
forall a. IO a -> IO a
makeGettableStateVar ((String -> [String])
-> GettableStateVar String -> GettableStateVar [String]
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap String -> [String]
words (GettableStateVar String -> GettableStateVar [String])
-> GettableStateVar String -> GettableStateVar [String]
forall a b. (a -> b) -> a -> b
$ GLenum -> GettableStateVar String
getString GLenum
GLU_EXTENSIONS)

getString :: GLenum -> IO String
getString :: GLenum -> GettableStateVar String
getString = IO (Ptr GLubyte) -> GettableStateVar String
getStringWith (IO (Ptr GLubyte) -> GettableStateVar String)
-> (GLenum -> IO (Ptr GLubyte))
-> GLenum
-> GettableStateVar String
forall b c a. (b -> c) -> (a -> b) -> a -> c
. GLenum -> IO (Ptr GLubyte)
forall (m :: * -> *). MonadIO m => GLenum -> m (Ptr GLubyte)
gluGetString