module Renderer where import SDL (($=)) import qualified Graphics.Rendering.OpenGL as GL import qualified Graphics.GLUtil as GLU import qualified Data.Map.Strict as M import qualified Data.ByteString as BS import Codec.Picture import Linear import Foreign -- internal imports import Types initSpriteRenderObjects = 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 return (SpriteRenderObjects quadVAO quadVBO) 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 ] initSpriteShaderObjects = do vertexShaderSrc <- BS.readFile "shader/vertex.sl" fragmentShaderSrc <- BS.readFile "shader/fragment.sl" shaderProgram <- GLU.simpleShaderProgramBS vertexShaderSrc fragmentShaderSrc return (SpriteShaderObjects shaderProgram) loadSprites :: IO (AssetDetails SpriteRenderObjects SpriteShaderObjects Sprite) loadSprites = do rawImg <- readImage "assets/img/lynx.jpg" let img = case rawImg of Left err -> error err Right dynImg -> convertRGBA8 dynImg vertObj <- initSpriteRenderObjects shadObj <- initSpriteShaderObjects return AssetDetails { adVertObj = vertObj , adShadObj = shadObj , adDataObj = M.singleton "lynx" (Sprite (V2 0 0) img) }