Files
loop/src/Shader.hs
T
2021-06-12 00:50:59 +02:00

340 lines
12 KiB
Haskell

module Shader
( makeShader
, addTexture
, addUniforms
, pokeShaders
--, pokeShader
, pokeShader'
--, bindArrayBuffers
, bindArrayBuffers'
, bindShaderBuffers
, makeSourcedShader
, setupVAO
, floatSize
, numDrawableElements
, drawShader
, drawShaders
, setShaderUniforms
, resetShaderUniforms
, extractProgAndUnis
, freeShaderPointers
, setPerpMatUniform
, module Shader.Data
)
where
import Geometry
import Shader.Data
import MatrixHelper
import Picture.Data
import Foreign
import Codec.Picture
import qualified Data.ByteString as BS
import qualified Data.Vector.Storable as V
import Control.Monad (unless, forM, zipWithM_, forM_, foldM)
import Control.Lens
import qualified Control.Foldl as F
import Graphics.Rendering.OpenGL hiding (Point,translate,scale,imageHeight)
--import Text.RawString.QQ
import Linear.Matrix
import Linear.V4
extractProgAndUnis :: FullShader -> (Program,UniformLocation)
extractProgAndUnis s = (_shaderProgram s, _shaderMatrixUniform s)
pokeShaders :: [FullShader] -> F.FoldM IO RenderType [Int]
pokeShaders = traverse pokeShader'
--pokeShaders = traverse pokeShader
pokeShader :: FullShader -> F.FoldM IO RenderType Int
pokeShader fs = F.FoldM (pokeRender fls (zip ptrs nAtss)) (return 0) return
where
(_,ptrs,nAtss) = unzip3 $ _vaoBufferTargets $ _shaderVAO fs
fls = _shaderPokeStrategy fs
pokeShader' :: FullShader -> F.FoldM IO RenderType Int
pokeShader' fs = F.FoldM (pokeRender' fls ptr stride) (return 0) return
where
theVBO = _vaoVBO $ _shaderVAO fs
ptr = _vboPointer theVBO
stride = sum $ _vboAttribSizes theVBO
fls = _shaderPokeStrategy fs
pokeRender :: (RenderType -> [[[Float]]])
-> [(Ptr Float,Int)] -> Int -> RenderType -> IO Int
pokeRender toFs ptrs n rt = pokeList ptrs n (toFs rt)
pokeRender'
:: (RenderType
-> [[[Float]]])
-> Ptr Float
-> Int -- ^ stride
-> Int
-> RenderType
-> IO Int
pokeRender' toFs ptr stride n rt = pokeList' ptr stride n (toFs rt)
pokeList :: [(Ptr Float,Int)] -> Int -> [[[Float]]] -> IO Int
pokeList ptrs = foldM (pokePtrs ptrs)
pokeList' :: Ptr Float -> Int -> Int -> [[[Float]]] -> IO Int
pokeList' ptr stride = foldM (pokePtrs' ptr stride)
pokePtrs' :: Ptr Float -> Int -> Int -> [[Float]] -> IO Int
pokePtrs' ptr stride n fss = do
pokeArrayOff ptr (stride * n) (concat fss)
return $ n + 1
pokePtrs :: [(Ptr Float,Int)] -> Int -> [[Float]] -> IO Int
pokePtrs ptrIs n fss = do
zipWithM_ f ptrIs fss
return $ n + 1
where
f (ptr,i) fs = pokeArrayOff ptr (i*n) fs
pokeArrayOff :: Storable a => Ptr a -> Int -> [a] -> IO ()
pokeArrayOff ptr i = zipWithM_ (pokeElemOff ptr) [i..]
bindArrayBuffers :: Int -> [(BufferObject,Ptr Float,Int)] -> IO ()
{-# INLINE bindArrayBuffers #-}
bindArrayBuffers numVs ps = do
forM_ ps $ \(bo,ptr,i) -> do
bindBuffer ArrayBuffer $= Just bo
bufferData ArrayBuffer $= (fromIntegral $ floatSize * numVs * i, ptr, DynamicDraw)
bindArrayBuffers' :: Int -> VBO -> IO ()
bindArrayBuffers' numVs theVBO = do
bindBuffer ArrayBuffer $= Just (_vbo theVBO)
bufferData ArrayBuffer $=
(fromIntegral $ floatSize * numVs * (sum $ _vboAttribSizes theVBO), _vboPointer theVBO, DynamicDraw)
bindShaderBuffers :: [FullShader] -> [Int] -> IO ()
bindShaderBuffers = zipWithM_ f
where
--f fs i = bindArrayBuffers i $ _vaoBufferTargets $ _shaderVAO fs
f fs i = bindArrayBuffers' i $ _vaoVBO $ _shaderVAO fs
drawShaders :: [FullShader] -> [Int] -> IO ()
drawShaders = zipWithM_ drawShader
drawShader :: FullShader -> Int -> IO ()
{-# INLINE drawShader #-}
drawShader fs i = do
currentProgram $= Just (_shaderProgram fs)
bindVertexArrayObject $= Just (_vao $ _shaderVAO fs)
case _shaderTexture fs of
Just ShaderTexture{_textureObject = txo}
-> textureBinding Texture2D $= Just txo
_ -> return ()
drawArrays (_shaderDrawPrimitive fs) 0 (fromIntegral i)
-- I am not sure if this assumes that the shader is constructed directly before
-- the texture is added...
addTexture :: String -> FullShader -> IO (FullShader)
addTexture texturePath shad = do
Right cmap <- readImage texturePath
let tex = convertRGBA8 cmap
textureOb <- genObjectName
textureBinding Texture2D $= Just textureOb
let texData = V.toList $ imageData tex
wtex = fromIntegral $ imageWidth tex
htex = fromIntegral $ imageHeight tex
withArray texData $ \ptr -> do
texImage2D Texture2D NoProxy 0 RGBA8 (TextureSize2D wtex htex) 0
(PixelData RGBA UnsignedByte ptr)
generateMipmap' Texture2D
textureFilter Texture2D $= ((Linear',Just Linear') , Nearest)
return $ shad & shaderTexture ?~ ShaderTexture {_textureObject = textureOb}
{- |
Compiles a full shader found within the shader directory.
The shader is made up of files begining with the inputted string with extensions .vert, .geom etc.
-}
makeShader
:: String -- ^ First part of the name of the shader
-> [ShaderType] -- ^ Filetype extensions
-> [Int] -- ^ The input vertex sizes
-> PrimitiveMode
-> (RenderType -> [[[Float]]]) -- ^ Poke strategy: method for creating a list of vertex data to be bound
-> IO (FullShader)
makeShader s shaderlist sizes pm renStrat = do
(prog,unis) <- makeSourcedShader s shaderlist
vaob <- setupVAO sizes
return $ FullShader { _shaderProgram = prog
, _shaderMatrixUniform = unis
, _shaderVAO = vaob
, _shaderPokeStrategy = renStrat
, _shaderDrawPrimitive = pm
, _shaderTexture = Nothing
, _shaderCustomUnis = []
}
floatSize :: Int
floatSize = sizeOf (0.5 :: GLfloat)
{-# INLINE floatSize #-}
bufferOffset :: Integral a => a -> Ptr b
bufferOffset = plusPtr nullPtr . (* floatSize) . fromIntegral
numDrawableElements :: Int
{-# INLINE numDrawableElements #-}
numDrawableElements = 50000
setupVAO :: [Int] -> IO VAO
setupVAO sizes = do
theVAO <- genObjectName
bindVertexArrayObject $= Just theVAO
vbos <- forM (zip (map fromIntegral [(0::Int)..]) sizes) setupArrayBuffer
ptrs <- forM (zip vbos sizes) setupVBOPointers
theVBO <- setupVBO $ sizes
return $ VAO
{ _vao = theVAO
, _vaoBufferTargets = ptrs
, _vaoVBO = theVBO
}
setupVBO :: [Int] -> IO VBO
setupVBO sizes = do
vboName <- genObjectName
bindBuffer ArrayBuffer $= Just vboName
forM_ (zip3 [0..] sizes offs) $ \(loc,siz,off) -> do
setupVertexAttribPointer loc siz strd off
thePtr <- mallocArray (strd * numDrawableElements)
return $ VBO
{ _vbo = vboName
, _vboPointer = thePtr
, _vboAttribSizes = sizes
}
where
strd = sum sizes
offs = scanl (+) 0 sizes
{- | Assumes the correct VBO is bound -}
setupVertexAttribPointer
:: Int -- ^ Atrib location
-> Int -- ^ Size
-> Int -- ^ Stride
-> Int -- ^ Offset
-> IO ()
setupVertexAttribPointer loc siz strd off = do
vertexAttribPointer (AttribLocation (fi loc)) $=
(ToFloat, VertexArrayDescriptor (fi' siz) Float (fi'' $ floatSize * strd) (bufferOffset off))
vertexAttribArray (AttribLocation (fi loc)) $= Enabled
where
fi = fromIntegral
fi' = fromIntegral
fi'' = fromIntegral
setupVBOPointers :: (BufferObject,Int) -> IO (BufferObject,Ptr Float,Int)
setupVBOPointers (vbo,vsize) = do
thePtr <- mallocArray (vsize * numDrawableElements)
return (vbo,thePtr,vsize)
setupArrayBuffer :: (GLuint,Int) -> IO BufferObject
setupArrayBuffer (aloc,i) = do
vbo <- genObjectName
bindBuffer ArrayBuffer $= Just vbo
vertexAttribPointer (AttribLocation aloc) $=
( ToFloat
, VertexArrayDescriptor (fromIntegral i)
Float
(fromIntegral $ floatSize * i)
(bufferOffset (0::Int))
)
vertexAttribArray (AttribLocation aloc) $= Enabled
return vbo
-- | Compile shader and get its uniform locations.
-- supposes the shader code is in the shader folder, with the string names
-- followed by .vert/.geom/.frag.
makeSourcedShader :: String -> [ShaderType] -> IO (Program, UniformLocation)
makeSourcedShader s sts = do
sources <- forM sts $ \st -> BS.readFile ("shader/" ++ s ++ shaderTypeExt st)
prog <- makeShaderProgram s $ zip sts sources
uniformLocations <- uniformLocation prog "worldMat"
return (prog,uniformLocations)
addUniforms :: [String] -> FullShader -> IO (FullShader)
addUniforms uniStrings shad = do
uniLocs <- mapM (uniformLocation $ _shaderProgram shad) uniStrings
return $ shad & shaderCustomUnis %~ (++ uniLocs)
shaderTypeExt :: ShaderType -> String
shaderTypeExt VertexShader = ".vert"
shaderTypeExt GeometryShader = ".geom"
shaderTypeExt FragmentShader = ".frag"
shaderTypeExt _ = undefined
makeShaderProgram :: String -> [(ShaderType,BS.ByteString)] -> IO Program
makeShaderProgram str sources = do
theShaderProgram <- createProgram
shaders <- mapM (compileAndCheckShader str) sources
mapM_ (attachShader theShaderProgram) shaders
linkProgram theShaderProgram
linkingSuccess <- linkStatus theShaderProgram
unless linkingSuccess $ do
infoLog <- get (programInfoLog theShaderProgram)
putStrLn $ str ++ ": Program Linking" ++ infoLog
return theShaderProgram
compileAndCheckShader :: String -> (ShaderType,BS.ByteString) -> IO Shader
compileAndCheckShader str (theShaderType,sourceCode) = do
theShader <- createShader theShaderType
shaderSourceBS theShader $= sourceCode
compileShader theShader
success <- compileStatus theShader
unless success $ do
infoLog <- get (shaderInfoLog theShader)
putStrLn $ str ++ ": Shader compile: " ++ show theShaderType ++ " : " ++ show infoLog
return theShader
resetShaderUniforms :: [(Program, UniformLocation)] -> IO ()
{-# INLINE resetShaderUniforms #-}
resetShaderUniforms = setShaderUniforms 0 1 (0,0) (2,2)
setShaderUniforms :: Float -> Float -> Point2 -> Point2 -> [(Program,UniformLocation)] -> IO ()
{-# INLINE setShaderUniforms #-}
setShaderUniforms rot czoom (tranx,trany) (winx,winy) fss = do
let scalMat = Linear.Matrix.transpose $
V4 (V4 (2*czoom/winx) 0 0 (0::GLfloat))
(V4 0 (2*czoom/winy) 0 0)
(V4 0 0 1 0)
(V4 0 0 0 1)
let rotMat = Linear.Matrix.transpose $
V4 (V4 (cos rot) (sin (-rot)) 0 0)
(V4 (sin rot) (cos rot) 0 0)
(V4 0 0 1 0)
(V4 0 0 0 1)
let tranMat = Linear.Matrix.transpose $
V4 (V4 1 0 0 0)
(V4 0 1 0 0)
(V4 0 0 1 0)
(V4 (-tranx) (-trany) 0 1)
let wmat = scalMat !*! rotMat !*! tranMat
vToL (V4 a b c d) = [a,b,c,d]
wmata <- (newMatrix RowMajor $ concatMap vToL $ vToL wmat) :: IO (GLmatrix GLfloat)
-- set common uniforms
forM_ fss $ \shad -> do
currentProgram $= Just (fst shad)
uniform (snd shad) $= wmata
setPerpMatUniform
:: Float -- ^ rotation
-> Float -- ^ zoom
-> Point2 -- ^ translation
-> Point2 -- ^ window size
-> Point2 -- ^ viewfrom point
-> FullShader
-> IO ()
setPerpMatUniform rot czoom trans wins vFrom shad = do
pmat <- (newMatrix RowMajor $ perspectiveMatrix rot czoom trans wins vFrom) :: IO (GLmatrix GLfloat)
currentProgram $= Just (_shaderProgram shad)
uniform (_shaderMatrixUniform shad) $= pmat
return ()
freeShaderPointers :: FullShader -> IO ()
freeShaderPointers fs = do
forM_ (_vaoBufferTargets $ _shaderVAO fs) $ \(_,ptr,_) ->
free ptr