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{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE MultiParamTypeClasses #-}
module Graphics.Glyph.GeometryBuilder where
import Data.Sequence as Seq
import Data.Maybe
import Graphics.Glyph.Util
import Graphics.Glyph.BufferBuilder
import Data.ByteStringBuilder
import Data.ByteString.Lazy
import Data.ByteString.Lazy.Char8 as BSLC
import Data.Foldable as Fold
import Text.Printf
data OutType = TriangleStrip | Triangles
instance Show OutType where
show TriangleStrip = "triangle_strip"
show Triangles = "triangle_strip"
buildSourceAsString :: GeometryBuilder a -> String
buildSourceAsString = BSLC.unpack . buildSource
buildSource :: GeometryBuilder a -> ByteString
buildSource builder =
runBuilder $ do
putSLn "#version 150"
putSLn "#extension GL_ARB_explicit_attrib_location : enable"
putSLn "#extension GL_ARB_explicit_uniform_location : enable"
putSLn "layout(points) in ;"
let isVertex (Vertex _ _ _ _) = True
isVertex _ = False
putSLn $ printf "layout(%s,max_vertices=%d) out ;"
(show $ maybeDefault TriangleStrip $ gOutType builder)
(Seq.length $ Seq.filter isVertex $ gList builder)
forM_ (textureOut builder) $ putSLn.("out vec2 "++) . (++";")
forM_ (normalOut builder) $ putSLn.("out vec3 "++) . (++";")
forM_ (positionOut builder) $ putSLn.("out vec4 "++) . (++";")
let pjMatStr = fromJust (pjMatrixUniform builder >||> Just "pjMatrix")
let mvMatStr = fromJust (mvMatrixUniform builder >||> Just "mvMatrix")
Fold.mapM_ (putSLn.("uniform mat4 "++).(++";")) [pjMatStr, mvMatStr]
putSLn "void main() {"
let vertexOutF =
case positionOut builder of
Nothing ->
printf "\tgl_Position = %s * (gl_in[0].gl_Position + %s * vec4(%f,%f,%f,%f));"
pjMatStr mvMatStr
Just str ->
printf "\tgl_Position = %s * (%s = gl_in[0].gl_Position + %s * vec4(%f,%f,%f,%f));"
pjMatStr str mvMatStr
let normalOutF = case normalOut builder of
Nothing -> const3 ""
Just str -> printf "\t%s = -inverse(transpose(mat3(%s))) * vec3(%f,%f,%f);" str mvMatStr
let textureOutF = case textureOut builder of
Nothing -> const2 ""
Just str -> printf "\t%s = vec2(%f,%f);" str
forM_ (gList builder) $ \datum ->
case datum of
Vertex x y z w -> putSLn $ vertexOutF x y z w
Normal x y z -> putSLn $ normalOutF x y z
Texture x y -> putSLn $ textureOutF x y
EmitVertex -> putSLn "\tEmitVertex();"
EndPrimitive -> putSLn "\tEndPrimitive();"
putSLn "}"
data GeometryDatum =
Vertex Float Float Float Float |
Texture Float Float |
Normal Float Float Float |
EmitVertex |
EndPrimitive
data GeometryBuilder a = GeometryBuilder {
gList :: (Seq GeometryDatum),
gOutType :: Maybe OutType,
pjMatrixUniform :: Maybe String,
mvMatrixUniform :: Maybe String,
maxVerts :: Maybe Int,
textureOut :: Maybe String,
normalOut :: Maybe String,
positionOut :: Maybe String,
gRet :: a
}
generating :: OutType -> GeometryBuilder () -> GeometryBuilder ()
generating TriangleStrip builder = builder { gOutType = Just TriangleStrip }
generating Triangles builder = do
let (nSeq,_) =
Fold.foldl' (\(tSeq,cnt) datum ->
case datum of
EmitVertex ->
if cnt == (2::Int) then (tSeq |> datum |> EndPrimitive, 0)
else (tSeq |> datum, cnt + 1)
_ -> (tSeq |> datum,cnt)
) (Seq.empty, 0) (gList builder)
builder {
gOutType = Just Triangles,
gList = nSeq
}
projectionMatrixUniform :: String -> GeometryBuilder ()
projectionMatrixUniform str = (return ()) { pjMatrixUniform = (Just str) }
modelViewMatrixUniform :: String -> GeometryBuilder ()
modelViewMatrixUniform str = (return ()) { mvMatrixUniform = (Just str) }
maxVerticies :: Int -> GeometryBuilder ()
maxVerticies i = (return ()) { maxVerts = (Just i) }
textureOutput :: String -> GeometryBuilder ()
textureOutput str = (return ()) { textureOut = (Just str) }
normalOutput :: String -> GeometryBuilder ()
normalOutput str = (return ()) { normalOut = (Just str) }
positionOutput :: String -> GeometryBuilder ()
positionOutput str = (return ()) { positionOut = (Just str) }
gVertex4 :: Float -> Float -> Float -> Float -> GeometryBuilder ()
gVertex4 x y z w = (return ()) { gList = Seq.singleton $ Vertex x y z w }
gNormal3 :: Float -> Float -> Float -> GeometryBuilder ()
gNormal3 x y z = (return ()) { gList = (Seq.singleton $ Normal x y z) }
gTexture2 :: Float -> Float -> GeometryBuilder ()
gTexture2 x y = (return ()) { gList = (Seq.singleton $ Texture x y) }
gEmitVertex :: GeometryBuilder ()
gEmitVertex = (return ()) { gList = (Seq.singleton $ EmitVertex) }
gEndPrimitive :: GeometryBuilder ()
gEndPrimitive = (return ()) { gList = Seq.singleton $ EndPrimitive }
gVertex4E :: Float -> Float -> Float -> Float -> GeometryBuilder ()
gVertex4E x y z w = gVertex4 x y z w >> gEmitVertex
instance Functor GeometryBuilder where
fmap f bb = bb >>= (return . f)
instance Applicative GeometryBuilder where
(<*>) afn aa = do
fn <- afn
a <- aa
return (fn a)
pure = return
instance Monad GeometryBuilder where
aB >> bB = GeometryBuilder
(gList aB >< gList bB)
(select gOutType gOutType)
(select pjMatrixUniform pjMatrixUniform)
(select mvMatrixUniform mvMatrixUniform)
(select maxVerts maxVerts)
(select textureOut textureOut)
(select normalOut normalOut)
(select positionOut positionOut)
(gRet bB)
where select f1 f2 = (f1 bB) >||> (f2 aB)
aB >>= func = aB >> func (gRet aB)
return = GeometryBuilder
Seq.empty
Nothing
Nothing
Nothing
Nothing
Nothing
Nothing
Nothing
instance IsModelBuilder Float GeometryBuilder where
plotVertex3 x y z = gVertex4E x y z 0
plotNormal = gNormal3
plotTexture = gTexture2
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