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{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE TemplateHaskell #-}
module Graphics.Glyph.GeometryBuilder where
import Data.ByteString.Lazy
import Data.ByteString.Lazy.Char8 as BSLC
import Data.ByteStringBuilder
import Data.Foldable as Fold
import Data.Maybe
import Data.Sequence as Seq
import Graphics.Glyph.BufferBuilder
import Graphics.Glyph.Util
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
|
