diff options
Diffstat (limited to 'Hello-glfw.hs')
-rw-r--r-- | Hello-glfw.hs | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/Hello-glfw.hs b/Hello-glfw.hs new file mode 100644 index 0000000..c93136b --- /dev/null +++ b/Hello-glfw.hs | |||
@@ -0,0 +1,101 @@ | |||
1 | {-# LANGUAGE PackageImports, LambdaCase, OverloadedStrings #-} | ||
2 | import "GLFW-b" Graphics.UI.GLFW as GLFW | ||
3 | import qualified Data.Map as Map | ||
4 | import qualified Data.Vector as V | ||
5 | |||
6 | import LambdaCube.GL as LambdaCubeGL -- renderer | ||
7 | import LambdaCube.GL.Mesh as LambdaCubeGL | ||
8 | |||
9 | import Codec.Picture as Juicy | ||
10 | |||
11 | import Data.Aeson | ||
12 | import qualified Data.ByteString as SB | ||
13 | |||
14 | ---------------------------------------------------- | ||
15 | -- See: http://lambdacube3d.com/getting-started | ||
16 | ---------------------------------------------------- | ||
17 | |||
18 | main :: IO () | ||
19 | main = do | ||
20 | Just pipelineDesc <- decodeStrict <$> SB.readFile "hello.json" | ||
21 | |||
22 | win <- initWindow "LambdaCube 3D DSL Hello World" 640 640 | ||
23 | |||
24 | -- setup render data | ||
25 | let inputSchema = makeSchema $ do | ||
26 | defObjectArray "objects" Triangles $ do | ||
27 | "position" @: Attribute_V2F | ||
28 | "uv" @: Attribute_V2F | ||
29 | defUniforms $ do | ||
30 | "time" @: Float | ||
31 | "diffuseTexture" @: FTexture2D | ||
32 | |||
33 | storage <- LambdaCubeGL.allocStorage inputSchema | ||
34 | |||
35 | -- upload geometry to GPU and add to pipeline input | ||
36 | LambdaCubeGL.uploadMeshToGPU triangleA >>= LambdaCubeGL.addMeshToObjectArray storage "objects" [] | ||
37 | LambdaCubeGL.uploadMeshToGPU triangleB >>= LambdaCubeGL.addMeshToObjectArray storage "objects" [] | ||
38 | |||
39 | -- load image and upload texture | ||
40 | Right img <- Juicy.readImage "logo.png" | ||
41 | textureData <- LambdaCubeGL.uploadTexture2DToGPU img | ||
42 | |||
43 | -- allocate GL pipeline | ||
44 | renderer <- LambdaCubeGL.allocRenderer pipelineDesc | ||
45 | LambdaCubeGL.setStorage renderer storage >>= \case -- check schema compatibility | ||
46 | Just err -> putStrLn err | ||
47 | Nothing -> loop | ||
48 | where loop = do | ||
49 | -- update graphics input | ||
50 | GLFW.getWindowSize win >>= \(w,h) -> LambdaCubeGL.setScreenSize storage (fromIntegral w) (fromIntegral h) | ||
51 | LambdaCubeGL.updateUniforms storage $ do | ||
52 | "diffuseTexture" @= return textureData | ||
53 | "time" @= do | ||
54 | Just t <- GLFW.getTime | ||
55 | return (realToFrac t :: Float) | ||
56 | -- render | ||
57 | LambdaCubeGL.renderFrame renderer | ||
58 | GLFW.swapBuffers win | ||
59 | GLFW.pollEvents | ||
60 | |||
61 | let keyIsPressed k = fmap (==KeyState'Pressed) $ GLFW.getKey win k | ||
62 | escape <- keyIsPressed Key'Escape | ||
63 | if escape then return () else loop | ||
64 | |||
65 | LambdaCubeGL.disposeRenderer renderer | ||
66 | LambdaCubeGL.disposeStorage storage | ||
67 | GLFW.destroyWindow win | ||
68 | GLFW.terminate | ||
69 | |||
70 | -- geometry data: triangles | ||
71 | triangleA :: LambdaCubeGL.Mesh | ||
72 | triangleA = Mesh | ||
73 | { mAttributes = Map.fromList | ||
74 | [ ("position", A_V2F $ V.fromList [V2 1 1, V2 1 (-1), V2 (-1) (-1)]) | ||
75 | , ("uv", A_V2F $ V.fromList [V2 1 1, V2 0 1, V2 0 0]) | ||
76 | ] | ||
77 | , mPrimitive = P_Triangles | ||
78 | } | ||
79 | |||
80 | triangleB :: LambdaCubeGL.Mesh | ||
81 | triangleB = Mesh | ||
82 | { mAttributes = Map.fromList | ||
83 | [ ("position", A_V2F $ V.fromList [V2 1 1, V2 (-1) (-1), V2 (-1) 1]) | ||
84 | , ("uv", A_V2F $ V.fromList [V2 1 1, V2 0 0, V2 1 0]) | ||
85 | ] | ||
86 | , mPrimitive = P_Triangles | ||
87 | } | ||
88 | |||
89 | initWindow :: String -> Int -> Int -> IO Window | ||
90 | initWindow title width height = do | ||
91 | GLFW.init | ||
92 | GLFW.defaultWindowHints | ||
93 | mapM_ GLFW.windowHint | ||
94 | [ WindowHint'ContextVersionMajor 3 | ||
95 | , WindowHint'ContextVersionMinor 3 | ||
96 | , WindowHint'OpenGLProfile OpenGLProfile'Core | ||
97 | , WindowHint'OpenGLForwardCompat True | ||
98 | ] | ||
99 | Just win <- GLFW.createWindow width height title Nothing Nothing | ||
100 | GLFW.makeContextCurrent $ Just win | ||
101 | return win | ||