canvas/app/Renderer.hs
2020-02-06 23:18:05 +01:00

42 lines
921 B
Haskell

module Renderer where
import SDL (($=))
import qualified Graphics.Rendering.OpenGL as GL
import Foreign
initSpriteRenderData = do
quadVAO <- GL.genObjectName
quadVBO <- GL.genObjectName
GL.bindBuffer GL.ArrayBuffer $= Just quadVBO
withArray rawVertices $ \ptr ->
GL.bufferData GL.ArrayBuffer $=
( fromIntegral $ length rawVertices * sizeOf (0 :: Float)
, ptr
, GL.StaticDraw
)
GL.bindVertexArrayObject $= Just quadVAO
GL.vertexAttribArray (GL.AttribLocation 0) $= GL.Enabled
GL.vertexAttribPointer (GL.AttribLocation 0) $=
( GL.ToFloat
, GL.VertexArrayDescriptor 4 GL.Float 0 (plusPtr nullPtr 0)
)
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
]