pioneers/src/Render/Render.hs

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{-# LANGUAGE BangPatterns #-}
module Render.Render where
import qualified Data.ByteString as B
import Foreign.Marshal.Array (withArray)
import Foreign.Storable (sizeOf)
import Graphics.Rendering.OpenGL.GL.BufferObjects
import Graphics.Rendering.OpenGL.GL.Framebuffer (clearColor)
import Graphics.Rendering.OpenGL.GL.ObjectName
import Graphics.Rendering.OpenGL.GL.Shaders
import Graphics.Rendering.OpenGL.GL.StateVar
import Graphics.Rendering.OpenGL.GL.VertexArrays (Capability (..),
vertexAttribArray)
import Graphics.Rendering.OpenGL.GL.VertexSpec
import Graphics.Rendering.OpenGL.Raw.Core31.Types (GLfloat)
import Render.Misc
vertexShaderFile :: String
vertexShaderFile = "shaders/vertex.shader"
fragmentShaderFile :: String
fragmentShaderFile = "shaders/fragment.shader"
initBuffer :: [GLfloat] -> IO BufferObject
initBuffer varray =
let
sizeOfVarray = length varray * sizeOfComponent
sizeOfComponent = sizeOf (head varray)
in do
bufferObject <- genObjectName
bindBuffer ArrayBuffer $= Just bufferObject
withArray varray $ \buffer ->
bufferData ArrayBuffer $= (fromIntegral sizeOfVarray, buffer, StaticDraw)
checkError "initBuffer"
return bufferObject
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initShader :: IO (AttribLocation, AttribLocation, AttribLocation, UniformLocation, UniformLocation)
initShader = do
! vertexSource <- B.readFile vertexShaderFile
! fragmentSource <- B.readFile fragmentShaderFile
vertexShader <- compileShaderSource VertexShader vertexSource
checkError "compile Vertex"
fragmentShader <- compileShaderSource FragmentShader fragmentSource
checkError "compile Frag"
program <- createProgramUsing [vertexShader, fragmentShader]
checkError "compile Program"
currentProgram $= Just program
projectionMatrixIndex <- get (uniformLocation program "fg_ProjectionMatrix")
checkError "projMat"
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modelMatrixIndex <- get (uniformLocation program "fg_ModelMatrix")
checkError "modelMat"
vertexIndex <- get (attribLocation program "fg_VertexIn")
vertexAttribArray vertexIndex $= Enabled
checkError "vertexInd"
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normalIndex <- get (attribLocation program "fg_NormalIn")
vertexAttribArray normalIndex $= Enabled
checkError "normalInd"
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colorIndex <- get (attribLocation program "fg_Color")
vertexAttribArray colorIndex $= Enabled
checkError "colorInd"
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att <- get (activeAttribs program)
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putStrLn $ unlines $ "Attributes: ":map show att
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putStrLn $ unlines $ ["Indices: ", show (colorIndex, normalIndex, vertexIndex)]
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checkError "initShader"
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return (colorIndex, normalIndex, vertexIndex, projectionMatrixIndex, modelMatrixIndex)
initRendering :: IO ()
initRendering = do
clearColor $= Color4 0 0 0 0
checkError "initRendering"