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|
--------------------------------------------------------------------------------
-- |
-- Module : LoadShaders
-- Copyright : (c) Sven Panne 2013
-- License : BSD3
--
-- Maintainer : Sven Panne <svenpanne@gmail.com>
-- Stability : stable
-- Portability : portable
--
-- Utilities for shader handling, adapted from LoadShaders.cpp which is (c) The
-- Red Book Authors.
--
--------------------------------------------------------------------------------
module Game.Internal.LoadShaders
( ShaderSource(..)
, ShaderInfo(..)
, loadShaders
) where
import Control.Exception
import Control.Monad
import qualified Data.ByteString as B
import Graphics.Rendering.OpenGL
--------------------------------------------------------------------------------
-- | The source of the shader source code.
data ShaderSource
= ByteStringSource B.ByteString
-- ^ The shader source code is directly given as a 'B.ByteString'.
| StringSource String
-- ^ The shader source code is directly given as a 'String'.
| FileSource FilePath
-- ^ The shader source code is located in the file at the given 'FilePath'.
deriving (Eq, Ord, Show)
getSource :: ShaderSource -> IO B.ByteString
getSource (ByteStringSource bs) = return bs
getSource (StringSource str) = return $ packUtf8 str
getSource (FileSource path) = B.readFile path
--------------------------------------------------------------------------------
-- | A description of a shader: The type of the shader plus its source code.
data ShaderInfo =
ShaderInfo ShaderType ShaderSource
deriving (Eq, Ord, Show)
--------------------------------------------------------------------------------
-- | Create a new program object from the given shaders, throwing an
-- 'IOException' if something goes wrong.
loadShaders :: [ShaderInfo] -> IO Program
loadShaders infos =
createProgram `bracketOnError` deleteObjectName $ \program -> do
loadCompileAttach program infos
linkAndCheck program
return program
linkAndCheck :: Program -> IO ()
linkAndCheck = checked linkProgram linkStatus programInfoLog "link"
loadCompileAttach :: Program -> [ShaderInfo] -> IO ()
loadCompileAttach _ [] = return ()
loadCompileAttach program (ShaderInfo shType source:infos) =
createShader shType `bracketOnError` deleteObjectName $ \shader -> do
src <- getSource source
shaderSourceBS shader $= src
compileAndCheck shader
attachShader program shader
loadCompileAttach program infos
compileAndCheck :: Shader -> IO ()
compileAndCheck = checked compileShader compileStatus shaderInfoLog "compile"
checked ::
(t -> IO ())
-> (t -> GettableStateVar Bool)
-> (t -> GettableStateVar String)
-> String
-> t
-> IO ()
checked action getStatus getInfoLog message object = do
action object
ok <- get (getStatus object)
unless ok $ do
infoLog <- get (getInfoLog object)
fail (message ++ " log: " ++ infoLog)
|
