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|
{-# LANGUAGE TemplateHaskell #-}
module Graphics.Glyph.GlyphObject (
GlyphObject,
getBufferObject,
getCompiledData,
getVertexAttribute,
getNormalAttribute,
getColorAttribute ,
getTextureAttribute,
getResources,
getSetupRoutine,
getTeardownRoutine,
getPrimitiveMode,
setBufferObject,
setCompiledData,
setVertexAttribute,
setNormalAttribute,
setColorAttribute ,
setTextureAttribute,
setResources,
setSetupRoutine,
setTeardownRoutine,
setPrimitiveMode,
prepare, teardown,
Drawable, draw, newGlyphObject,
newDefaultGlyphObject
) where
import Graphics.Glyph.BufferBuilder
import Graphics.Glyph.Util
import Graphics.Rendering.OpenGL
import Data.Setters
import Control.Monad
import Control.Applicative
import Data.Maybe
class Drawable a where
-- mvMat -> pMat -> obj -> IO ()
draw :: a -> IO ()
data GlyphObject a = GlyphObject {
bufferObject :: BufferObject, -- buffer
compiledData :: (CompiledBuild GLfloat), -- compiled data
vertexAttribute :: AttribLocation, -- vertex attribute
normalAttribute :: (Maybe AttribLocation), -- normal attrib
colorAttribute :: (Maybe AttribLocation), -- color attrib
textureAttribute :: (Maybe AttribLocation), -- texture attrib
resources :: a, -- Resources
setupRoutine :: (Maybe (GlyphObject a -> IO ())), -- Setup
teardownRoutine :: (Maybe (GlyphObject a -> IO ())), -- Tear down
primitiveMode :: PrimitiveMode
}
$(declareSetters ''GlyphObject)
getBufferObject :: GlyphObject a -> BufferObject
getBufferObject = bufferObject
getCompiledData :: GlyphObject a -> (CompiledBuild GLfloat)
getCompiledData = compiledData
getVertexAttribute :: GlyphObject a -> AttribLocation
getVertexAttribute = vertexAttribute
getNormalAttribute :: GlyphObject a -> (Maybe AttribLocation)
getNormalAttribute = normalAttribute
getColorAttribute :: GlyphObject a -> (Maybe AttribLocation)
getColorAttribute = colorAttribute
getTextureAttribute :: GlyphObject a -> (Maybe AttribLocation)
getTextureAttribute = textureAttribute
getResources :: GlyphObject a -> a
getResources = resources
getSetupRoutine :: GlyphObject a -> (Maybe (GlyphObject a -> IO ()))
getSetupRoutine = setupRoutine
getTeardownRoutine :: GlyphObject a -> (Maybe (GlyphObject a -> IO ()))
getTeardownRoutine = teardownRoutine
getPrimitiveMode :: GlyphObject a -> PrimitiveMode
getPrimitiveMode = primitiveMode
newGlyphObject :: Builder GLfloat x ->
AttribLocation ->
Maybe AttribLocation ->
Maybe AttribLocation ->
Maybe AttribLocation ->
a ->
Maybe (GlyphObject a -> IO ()) ->
Maybe (GlyphObject a -> IO ()) ->
PrimitiveMode ->
IO (GlyphObject a)
newGlyphObject builder vertAttr normAttr colorAttr textureAttr res setup tear mode = do
compiled <- compilingBuilder builder
buffer <- createBufferObject ArrayBuffer compiled
return $ GlyphObject buffer compiled vertAttr normAttr colorAttr textureAttr res setup tear mode
prepare :: GlyphObject a -> (GlyphObject a -> IO()) -> GlyphObject a
prepare a b = setSetupRoutine (Just b) a
teardown :: GlyphObject a -> (GlyphObject a -> IO()) -> GlyphObject a
teardown a b = setTeardownRoutine (Just b) a
instance Drawable (GlyphObject a) where
draw obj@(GlyphObject bo co vAttr nAttr cAttr tAttr _ setup tearDown p) = do
{- Setup whatever we need for the object to draw itself -}
maybe (return ()) (apply obj) setup
{- Get the array descriptors for the possible
- parts -}
let vad = vertexArrayDescriptor co
let nad = normalArrayDescriptor co
let cad = colorArrayDescriptor co
let tad = textureArrayDescriptor co
bindBuffer ArrayBuffer $= Just bo
let enabled = catMaybes $
map liftMaybe [(Just vAttr,Just vad), (nAttr, nad), (cAttr,cad), (tAttr,tad)]
forM_ enabled $ \(attr, ad) -> do
vertexAttribPointer attr $= (ToFloat, ad)
vertexAttribArray attr $= Enabled
drawArrays p 0 (bufferLength co)
forM_ enabled $ \(attr, _) -> do
vertexAttribArray attr $= Disabled
{- Tear down whatever the object needs -}
maybe (return ()) (apply obj) tearDown
where liftMaybe (Just a, Just b) = Just (a,b)
liftMaybe _ = Nothing
apply obj' f = f obj'
instance (Show a) => Show (GlyphObject a) where
show (GlyphObject _ co vAttr nAttr cAttr tAttr res _ _ p) =
"[GlyphObject compiled=" ++! co ++ " vertAttr=" ++! vAttr ++
" normalAttr="++!nAttr++" colorAttr="++!cAttr++" textureAttr="++!tAttr++" res="++!res++" PrimitiveMode="++!p++"]"
newDefaultGlyphObject :: Builder GLfloat x -> a -> IO (GlyphObject a)
newDefaultGlyphObject builder resources =
newGlyphObject builder
(AttribLocation 0) -- vertex
(Just $ AttribLocation 1) -- normal
(Just $ AttribLocation 2) -- color
(Just $ AttribLocation 3) -- texture
resources
Nothing -- setup
Nothing -- teardown
Triangles -- primitive
|
