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module Graphics.Glyph.Shaders where
import Control.Monad
import qualified Data.ByteString as BS
import Data.Maybe
import Graphics.Rendering.OpenGL
loadShader :: ShaderType -> FilePath -> IO (String, Maybe Shader)
loadShader typ path = do
shader <- createShader typ
(shaderSourceBS shader $=) =<< BS.readFile path
compileShader shader
ok <- get (compileStatus shader)
infoLog <- get (shaderInfoLog shader)
unless ok $
deleteObjectNames [shader]
return (infoLog, if not ok then Nothing else Just shader)
loadShaders :: [(ShaderType, FilePath)] -> IO [(String, Maybe Shader)]
loadShaders = mapM (uncurry loadShader)
workingShaders :: [(a, Maybe Shader)] -> [Shader]
workingShaders lst = map (fromJust . snd) (filter (isJust . snd) lst)
createShaderProgram :: [Shader] -> IO (String, Maybe Program)
createShaderProgram shaders = do
p <- createProgram
mapM_ (attachShader p) shaders
linkProgram p
ok <- get $ linkStatus p
info <- get $ programInfoLog p
unless ok $
deleteObjectNames [p]
return (info, if not ok then Nothing else Just p)
getUniform :: Uniform a => String -> IO (Maybe (StateVar a))
getUniform name =
get currentProgram
>>= ( \pr -> case pr of
Just p -> liftM (Just . uniform) (get $ uniformLocation p name)
Nothing -> return Nothing
)
getUniformForProgram :: Uniform a => String -> Program -> IO (StateVar a)
getUniformForProgram name prog =
liftM uniform (get $ uniformLocation prog name)
getUniformLocation :: String -> IO (Maybe UniformLocation)
getUniformLocation name =
get currentProgram
>>= maybe
(return Nothing)
( \prog ->
liftM Just (get $ uniformLocation prog name)
)
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