--------------------------------------------------------------------------------
-- |
-- Module      :  Graphics.Rendering.OpenGL.GL.PixelRectangles.Rasterization
-- Copyright   :  (c) Sven Panne 2002-2019
-- License     :  BSD3
-- 
-- Maintainer  :  Sven Panne <svenpanne@gmail.com>
-- 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.GL

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

drawPixels :: Size -> PixelData a -> IO ()
drawPixels :: forall a. Size -> PixelData a -> IO ()
drawPixels (Size GLsizei
w GLsizei
h) PixelData a
pd = PixelData a -> (GLenum -> GLenum -> Ptr a -> IO ()) -> IO ()
forall a b. PixelData a -> (GLenum -> GLenum -> Ptr a -> b) -> b
withPixelData PixelData a
pd ((GLenum -> GLenum -> Ptr a -> IO ()) -> IO ())
-> (GLenum -> GLenum -> Ptr a -> IO ()) -> IO ()
forall a b. (a -> b) -> a -> b
$ GLsizei -> GLsizei -> GLenum -> GLenum -> Ptr a -> IO ()
forall (m :: * -> *) a.
MonadIO m =>
GLsizei -> GLsizei -> GLenum -> GLenum -> Ptr a -> m ()
glDrawPixels GLsizei
w GLsizei
h

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

pixelZoom :: StateVar (GLfloat, GLfloat)
pixelZoom :: StateVar (GLfloat, GLfloat)
pixelZoom =
   IO (GLfloat, GLfloat)
-> ((GLfloat, GLfloat) -> IO ()) -> StateVar (GLfloat, GLfloat)
forall a. IO a -> (a -> IO ()) -> StateVar a
makeStateVar
      ((GLfloat -> GLfloat -> (GLfloat, GLfloat))
-> IO GLfloat -> IO GLfloat -> IO (GLfloat, GLfloat)
forall (m :: * -> *) a1 a2 r.
Monad m =>
(a1 -> a2 -> r) -> m a1 -> m a2 -> m r
liftM2 (,) ((GLfloat -> GLfloat) -> PName1F -> IO GLfloat
forall p a. GetPName1F p => (GLfloat -> a) -> p -> IO a
getFloat1 GLfloat -> GLfloat
forall a. a -> a
id PName1F
GetZoomX) ((GLfloat -> GLfloat) -> PName1F -> IO GLfloat
forall p a. GetPName1F p => (GLfloat -> a) -> p -> IO a
getFloat1 GLfloat -> GLfloat
forall a. a -> a
id PName1F
GetZoomY))
      ((GLfloat -> GLfloat -> IO ()) -> (GLfloat, GLfloat) -> IO ()
forall a b c. (a -> b -> c) -> (a, b) -> c
uncurry GLfloat -> GLfloat -> IO ()
forall (m :: * -> *). MonadIO m => GLfloat -> GLfloat -> m ()
glPixelZoom)