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{-
DrawF.hs (adapted from drawf.c which is (c) Silicon Graphics, Inc)
Copyright (c) Sven Panne 2002-2005 <sven.panne@aedion.de>
This file is part of HOpenGL and distributed under a BSD-style license
See the file libraries/GLUT/LICENSE
Draws the bitmapped letter F on the screen (several times).
This demonstrates use of the bitmap call.
-}
import Foreign ( Ptr, newArray )
import System.Exit ( exitWith, ExitCode(ExitSuccess) )
import Graphics.UI.GLUT
myInit :: IO (Ptr GLubyte)
myInit = do
rowAlignment Unpack $= 1
clearColor $= Color4 0 0 0 0
newArray [
0xc0, 0x00, 0xc0, 0x00, 0xc0, 0x00, 0xc0, 0x00, 0xc0, 0x00,
0xff, 0x00, 0xff, 0x00, 0xc0, 0x00, 0xc0, 0x00, 0xc0, 0x00,
0xff, 0xc0, 0xff, 0xc0 ]
display :: Ptr GLubyte -> DisplayCallback
display rasters = do
clear [ ColorBuffer ]
-- resolve overloading, not needed in "real" programs
let color3f = color :: Color3 GLfloat -> IO ()
rasterPos2i = rasterPos :: Vertex2 GLint -> IO ()
color3f (Color3 1 1 1)
rasterPos2i (Vertex2 20 20)
sequence_ $ replicate 3 $
bitmap (Size 10 12) (Vertex2 0 0) (Vector2 11 0) rasters
flush
reshape :: ReshapeCallback
reshape size@(Size w h) = do
viewport $= (Position 0 0, size)
matrixMode $= Projection
loadIdentity
ortho 0 (fromIntegral w) 0 (fromIntegral h) (-1) 1
matrixMode $= Modelview 0
keyboard :: KeyboardMouseCallback
keyboard (Char '\27') Down _ _ = exitWith ExitSuccess
keyboard _ _ _ _ = return ()
-- Main Loop
-- Open window with initial window size, title bar,
-- RGBA display mode, and handle input events.
main :: IO ()
main = do
(progName, _args) <- getArgsAndInitialize
initialDisplayMode $= [ SingleBuffered, RGBMode ]
initialWindowSize $= Size 100 100
initialWindowPosition $= Position 100 100
createWindow progName
rasters <- myInit
reshapeCallback $= Just reshape
keyboardMouseCallback $= Just keyboard
displayCallback $= display rasters
mainLoop
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