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module Graphics.Glyph.Textures where
import Control.Monad
import Data.Array.Storable
import Data.Word
import Graphics.GL.Compatibility30
import Graphics.Rendering.OpenGL
data Pixels
= PixelsRGB (Int, Int) (StorableArray Int Word8)
| PixelsRGBA (Int, Int) (StorableArray Int Word8)
pixelsArray :: Pixels -> StorableArray Int Word8
pixelsArray (PixelsRGB _ a) = a
pixelsArray (PixelsRGBA _ a) = a
-- construct a new 2d array of pixels
makePixelsRGB :: (Int, Int) -> IO Pixels
makePixelsRGB a@(w, h) = liftM (PixelsRGB a) (newArray_ (0, w * h -1))
-- convert a list of rgb values to an array
newPixelsFromListRGB :: (Int, Int) -> [(Word8, Word8, Word8)] -> IO Pixels
newPixelsFromListRGB a@(w, h) lst =
liftM (PixelsRGB a) $
( newListArray (0, w * h * 3)
. concatMap (\(x, y, z) -> [x, y, z])
)
lst
newPixelsFromListRGBA :: (Int, Int) -> [(Word8, Word8, Word8, Word8)] -> IO Pixels
newPixelsFromListRGBA a@(w, h) lst =
liftM (PixelsRGBA a) $
newListArray
(0, w * h * 4)
(concatMap (\(x, y, z, q) -> [x, y, z, q]) lst)
attachPixelsToTexture :: Pixels -> TextureObject -> IO ()
attachPixelsToTexture pixels tex =
withStorableArray (pixelsArray pixels) $ \ptr -> do
textureBinding Texture2D $= Just tex
case pixels of
PixelsRGB (w, h) _ -> glTexImage2D GL_TEXTURE_2D 0 3 (f w) (f h) 0 GL_RGB GL_UNSIGNED_BYTE ptr
PixelsRGBA (w, h) _ -> glTexImage2D GL_TEXTURE_2D 0 4 (f w) (f h) 0 GL_RGBA GL_UNSIGNED_BYTE ptr
where
f = fromIntegral
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