--------------------------------------------------------------------------------
-- |
-- Module      :  Graphics.Rendering.OpenGL.GL.PixelRectangles.Rasterization
-- Copyright   :  (c) Sven Panne 2002-2009
-- License     :  BSD-style (see the file libraries/OpenGL/LICENSE)
-- 
-- Maintainer  :  sven.panne@aedion.de
-- Stability   :  stable
-- Portability :  portable
--
-- This module corresponds to a part of section 3.6.4 (Rasterization of Pixel
-- Rectangles) of the OpenGL 2.1 specs.
--
--------------------------------------------------------------------------------

module Graphics.Rendering.OpenGL.GL.PixelRectangles.Rasterization (
   PixelData(..), PixelFormat(..), drawPixels, pixelZoom
) where

import Control.Monad
import Data.StateVar
import Graphics.Rendering.OpenGL.GL.CoordTrans
import Graphics.Rendering.OpenGL.GL.PixelData
import Graphics.Rendering.OpenGL.GL.PixelFormat
import Graphics.Rendering.OpenGL.GL.QueryUtils
import Graphics.Rendering.OpenGL.Raw.ARB.Compatibility (
   glDrawPixels, glPixelZoom )
import Graphics.Rendering.OpenGL.Raw.Core31

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

drawPixels :: Size -> PixelData a -> IO ()
drawPixels (Size w h) pd = withPixelData pd $ glDrawPixels w h

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

pixelZoom :: StateVar (GLfloat, GLfloat)
pixelZoom =
   makeStateVar
      (liftM2 (,) (getFloat1 id GetZoomX) (getFloat1 id GetZoomY))
      (uncurry glPixelZoom)