94 lines
2.2 KiB
Haskell
94 lines
2.2 KiB
Haskell
{-# LANGUAGE TypeFamilies #-}
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module VertexBufferDynamic where
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import qualified Graphics.Rendering.OpenGL as GL
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import SDL (($=), get)
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import Linear
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import Foreign
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import Foreign.C.Types
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-- internal imports
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import BindableClass
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import BufferClass
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-- layout of the VertexBuffer data object
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data VertexBufferDynamic = VertexBufferDynamic
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{ vBufId :: GL.BufferObject -- buffer id
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, vBufSize :: GL.GLsizeiptr -- size of data
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-- , vBufData :: Ptr a -- pointer to data
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}
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data Vertex = Vertex
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{ vertPosition :: V3 GL.GLfloat
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, vertColor :: V4 GL.GLfloat
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, vertTexCoord :: V2 GL.GLfloat
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, vertTexID :: GL.GLfloat
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, vertSize :: GL.GLsizei
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}
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-- | Smart constructor for a new Vertex
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newVertex
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:: V3 GL.GLfloat
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-> V4 GL.GLfloat
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-> V2 GL.GLfloat
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-> GL.GLfloat
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-> Vertex
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newVertex pos color texcoord index =
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Vertex
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pos
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color
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texcoord
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index
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(fromIntegral $ 10 * (sizeOf (undefined :: GL.GLfloat)))
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-- instanciate typeclass from BufferClass and fill in missing implementations
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instance Buffer VertexBufferDynamic where
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type ObjName VertexBufferDynamic = GL.BufferObject
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target _ = GL.ArrayBuffer
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glId = vBufId
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initialize buf = do
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-- bind the buffer using the default iplementation of the typeclass
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bind buf
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-- fill in the data
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GL.bufferData (target buf) $=
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( vBufSize buf
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, nullPtr
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, GL.DynamicDraw
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)
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-- release the buffer using the default implementation of the typeclass
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unbind buf
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instance Bindable VertexBufferDynamic where
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-- bind the buffer
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bind buf = GL.bindBuffer (target buf) $= Just (glId buf)
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-- unbind the buffer
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unbind buf = GL.bindBuffer (target buf) $= Nothing
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newVertexBufferDynamic
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:: IO VertexBufferDynamic -- newly built VertexBuffer data object
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newVertexBufferDynamic = do
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let dummyVertex = newVertex (V3 0 0 0) (V4 0 0 0 0) (V2 0 0) 0
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-- create the buffer object in applicative style
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buf <- VertexBufferDynamic
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-- generate the ID
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<$> GL.genObjectName
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-- compute buffer size
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<*> pure (CPtrdiff (fromIntegral $ 1024 * vertSize dummyVertex))
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-- make pointer out of list
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-- <*> newArray list
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-- fill the data in to the buffer
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initialize buf
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-- return the data object
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return buf
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