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module Render ( setup
, resize
, render
) where
import Game
import Level
import Tank
import Bindings.GLPng
import Control.Monad.State
import Data.Fixed
import Data.Ratio
import Graphics.Rendering.OpenGL.GL (($=), GLfloat, GLdouble)
import Graphics.Rendering.OpenGL.GL.BeginEnd (renderPrimitive, PrimitiveMode(..))
import Graphics.Rendering.OpenGL.GL.CoordTrans (matrixMode, MatrixMode(..), viewport, Position(..), Size(..), loadIdentity, ortho)
import Graphics.Rendering.OpenGL.GL.Framebuffer (clear, ClearBuffer(..))
import Graphics.Rendering.OpenGL.GL.Texturing.Parameters (Repetition(..), Clamping(..), TextureFilter(..), MinificationFilter, MagnificationFilter)
import Graphics.Rendering.OpenGL.GL.VertexSpec
setup :: Int -> Int -> Game ()
setup w h = do
resize w h
(tex, info) <- liftIO $ pngBind "tex/Wood.png" NoMipmap Solid (Repeated, Repeat) (Linear', Nothing) Linear'
liftIO $ print info
resize :: Int -> Int -> Game ()
resize w h = do
let wn = fromIntegral w
hn = fromIntegral h
aspect = fromReal (wn/hn)
lvl <- gets level
let s = max (0.5*(fromIntegral $ levelWidth lvl)/aspect) (0.5*(fromIntegral $ levelHeight lvl)) :: GLdouble
liftIO $ do
matrixMode $= Projection
loadIdentity
ortho (-s*aspect) (s*aspect) (-s) s (-1) 1
matrixMode $= Modelview 0
viewport $= ((Position 0 0), (Size (fromIntegral w) (fromIntegral h)))
render :: Game ()
render = do
tank <- liftM head $ gets tanks
let x = fromReal . posx $ tank
y = fromReal . posy $ tank
liftIO $ do
clear [ColorBuffer]
renderPrimitive Quads $ do
vertex $ Vertex2 (x-0.5 :: GLfloat) (y-0.5 :: GLfloat)
vertex $ Vertex2 (x-0.5 :: GLfloat) (y+0.5 :: GLfloat)
vertex $ Vertex2 (x+0.5 :: GLfloat) (y+0.5 :: GLfloat)
vertex $ Vertex2 (x+0.5 :: GLfloat) (y-0.5 :: GLfloat)
fromReal :: (Real a, Fractional b) => a -> b
fromReal = fromRational . toRational
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