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{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE MultiParamTypeClasses #-}
module Graphics.Glyph.ExtendedGL.Base where
import qualified Graphics.Rendering.OpenGL as GL
import Graphics.Rendering.OpenGL.Raw.Core31
import Graphics.Rendering.OpenGL.Raw.ARB
import Foreign.Marshal.Alloc
import Foreign.Ptr
import Foreign.Storable
import Foreign.C.Types
import System.IO.Unsafe
import Control.Monad
import Data.StateVar
import Unsafe.Coerce
data ExPrimitiveMode = Points | Triangles | Lines | Patches deriving (Show,Enum)
class IsBindable a where
bind :: a -> IO ()
class IsGLEnumMarshallable a where
toGLEnum :: a -> GLenum
class IsGenerable a where
generate :: IO a
class IsWrappedPrimitive t a where
unwrap :: a -> t
wrap :: t -> a
class HasIntegerParam t a where
parami :: t -> a -> SettableStateVar GLuint
class HasFloatParam t a where
paramf :: t -> a -> SettableStateVar GLfloat
class HasParamOfType b t a where
param :: t -> a -> SettableStateVar b
class IsPrimitiveModeMarshallable a where
marshalPrimitiveMode :: a -> GLuint
castPrimitive :: forall a b t. (IsWrappedPrimitive t a, IsWrappedPrimitive t b) => a -> b
castPrimitive x = wrap unw
where
unw :: t
unw = unwrap x
instance (IsWrappedPrimitive a a) where
unwrap = id
wrap = id
instance (IsWrappedPrimitive GLenum a) => IsGLEnumMarshallable a where
toGLEnum = unwrap
instance IsPrimitiveModeMarshallable ExPrimitiveMode where
marshalPrimitiveMode x = case x of
Points -> gl_POINTS
Triangles -> gl_TRIANGLES
Lines -> gl_LINES
Patches -> gl_PATCHES
instance IsPrimitiveModeMarshallable GL.PrimitiveMode where
marshalPrimitiveMode x = case x of
GL.Points -> 0x0
GL.Lines -> 0x1
GL.LineLoop -> 0x2
GL.LineStrip -> 0x3
GL.Triangles -> 0x4
GL.TriangleStrip -> 0x5
GL.TriangleFan -> 0x6
GL.Quads -> 0x7
GL.QuadStrip -> 0x8
GL.Polygon -> 0x9
instance IsPrimitiveModeMarshallable GLuint where
marshalPrimitiveMode = id
drawArraysInstanced ::
(IsPrimitiveModeMarshallable a) =>
a -> GL.ArrayIndex ->
GL.NumArrayIndices ->
GLsizei -> IO ()
drawArraysInstanced = glDrawArraysInstanced . marshalPrimitiveMode
vertexAttributeDivisor :: GL.AttribLocation -> SettableStateVar GLuint
vertexAttributeDivisor (GL.AttribLocation loc) =
makeSettableStateVar $ \val ->
glVertexAttribDivisor loc val
{- Sets the number of vertices per patch
- for OpenGL -}
patchVertices :: (Integral a) => SettableStateVar a
patchVertices =
makeSettableStateVar $ \val ->
glPatchParameteri gl_PATCH_VERTICES $ fromIntegral val
{- Returns the maximum number of patches
- for a tessilation shader -}
maxPatchVertices :: IO CInt
maxPatchVertices =
alloca $ \ptr -> do
glGetIntegerv gl_MAX_PATCH_VERTICES ptr
peek ptr
getGLVersion :: IO String
getGLVersion =
let lift2 (a,b) = do
x <- a ; y <- b ; return (x,y)
in
alloca $ \ptr1 -> alloca $ \ptr2 -> do
glGetIntegerv gl_MAJOR_VERSION ptr1
glGetIntegerv gl_MINOR_VERSION ptr2
(v1,v2) <- lift2 (peek ptr1, peek ptr2)
return ("OpenGL " ++ show v1 ++ "." ++ show v2)
coerced :: a
coerced = unsafeCoerce (0::Int)
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