canvas/app/Renderer.hs

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module Renderer where
import SDL (($=))
import qualified Graphics.Rendering.OpenGL as GL
import Foreign
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initSpriteRenderData = do
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quadVAO <- GL.genObjectName
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quadVBO <- GL.genObjectName
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GL.bindBuffer GL.ArrayBuffer $= Just quadVBO
withArray rawVertices $ \ptr ->
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GL.bufferData GL.ArrayBuffer $=
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( fromIntegral $ length rawVertices * sizeOf (0 :: Float)
, ptr
, GL.StaticDraw
)
GL.bindVertexArrayObject $= Just quadVAO
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GL.vertexAttribArray (GL.AttribLocation 0) $= GL.Enabled
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GL.vertexAttribPointer (GL.AttribLocation 0) $=
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( GL.ToFloat
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, GL.VertexArrayDescriptor 4 GL.Float 0 (plusPtr nullPtr 0)
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)
GL.bindBuffer GL.ArrayBuffer $= Nothing
GL.bindVertexArrayObject $= Nothing
where
rawVertices :: [Float]
rawVertices =
[ 0, 1, 0, 0
, 1, 0, 1, 0
, 0, 0, 0, 0
, 0, 1, 0, 1
, 1, 1, 1, 1
, 1, 0, 1, 0
]