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Diffstat (limited to 'examples/pickInt.hs')
-rw-r--r-- | examples/pickInt.hs | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/examples/pickInt.hs b/examples/pickInt.hs new file mode 100644 index 0000000..2703e91 --- /dev/null +++ b/examples/pickInt.hs | |||
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1 | {-# LANGUAGE PackageImports, LambdaCase, OverloadedStrings, StandaloneDeriving, ViewPatterns #-} | ||
2 | import Control.Monad | ||
3 | import Data.Aeson | ||
4 | import Data.Vect (Mat4(..), Vec3(..), Vec4(..)) | ||
5 | import Graphics.GL.Core33 as GL | ||
6 | import LambdaCube.GL as LambdaCubeGL | ||
7 | import LambdaCube.GL.Mesh as LambdaCubeGL | ||
8 | import Text.Printf | ||
9 | import "GLFW-b" Graphics.UI.GLFW as GLFW | ||
10 | import qualified Data.ByteString as SB | ||
11 | import qualified Data.Map as Map | ||
12 | import qualified Data.Vect as Vc | ||
13 | import qualified Data.Vector as V | ||
14 | import qualified Foreign as F | ||
15 | import qualified Foreign.C.Types as F | ||
16 | import qualified LambdaCube.GL.Type as LC | ||
17 | import qualified LambdaCube.Linear as LCLin | ||
18 | |||
19 | ---------------------------------------------------- | ||
20 | -- See: http://lambdacube3d.com/getting-started | ||
21 | ---------------------------------------------------- | ||
22 | |||
23 | screenDim :: (Int, Int) | ||
24 | screenDim = (800, 600) | ||
25 | (screenW, screenH) = screenDim | ||
26 | |||
27 | main :: IO () | ||
28 | main = do | ||
29 | Just pipePickDesc <- decodeStrict <$> SB.readFile "pickInt.json" | ||
30 | Just pipeDrawDesc <- decodeStrict <$> SB.readFile "pickIntDraw.json" | ||
31 | |||
32 | win <- initWindow "LambdaCube 3D integer picking" 800 600 | ||
33 | |||
34 | -- setup render data | ||
35 | let inputSchema = makeSchema $ do | ||
36 | defObjectArray "objects" Triangles $ do | ||
37 | "position" @: Attribute_V2F | ||
38 | "id" @: Attribute_Int | ||
39 | "color" @: Attribute_V4F | ||
40 | defUniforms $ do | ||
41 | "viewProj" @: M44F | ||
42 | |||
43 | storage <- LambdaCubeGL.allocStorage inputSchema | ||
44 | |||
45 | -- upload geometry to GPU and add to pipeline input | ||
46 | LambdaCubeGL.uploadMeshToGPU triangleA >>= LambdaCubeGL.addMeshToObjectArray storage "objects" [] | ||
47 | LambdaCubeGL.uploadMeshToGPU triangleB >>= LambdaCubeGL.addMeshToObjectArray storage "objects" [] | ||
48 | |||
49 | -- allocate GL pipeline | ||
50 | pipePick <- LambdaCubeGL.allocRenderer pipePickDesc | ||
51 | pipeDraw <- LambdaCubeGL.allocRenderer pipeDrawDesc | ||
52 | errPick <- LambdaCubeGL.setStorage pipePick storage | ||
53 | errDraw <- LambdaCubeGL.setStorage pipeDraw storage | ||
54 | case (errPick, errDraw) of -- check schema compatibility | ||
55 | (Just err, _) -> putStrLn err | ||
56 | (_, Just err) -> putStrLn err | ||
57 | (Nothing, Nothing) -> loop | ||
58 | where loop = do | ||
59 | -- update graphics input | ||
60 | GLFW.getWindowSize win >>= \(w,h) -> LambdaCubeGL.setScreenSize storage (fromIntegral w) (fromIntegral h) | ||
61 | LambdaCubeGL.updateUniforms storage $ do | ||
62 | let (x, y) = (,) 0 0 | ||
63 | cvpos = Vec3 x (-y) 0 | ||
64 | toScreen = screenM screenW screenH | ||
65 | "viewProj" @= pure (mat4ToM44F $! (Vc.fromProjective $! Vc.translation cvpos) Vc..*. toScreen) | ||
66 | |||
67 | (curX, curY) <- GLFW.getCursorPos win | ||
68 | let pickPoints = -- should be fb 0 fb 1 (pick) | ||
69 | [ (clamp curX 800, clamp curY 600) | ||
70 | , (0, 0) -- black 0 | ||
71 | , (200, 200) -- ..blue, ffff0000 2 | ||
72 | , (600, 400) -- ..red, ff0000ff 1 | ||
73 | ] :: [(Int, Int)] | ||
74 | clamp v m = min (pred m) $ max 0 (floor v) | ||
75 | |||
76 | -- render to render texture | ||
77 | LambdaCubeGL.renderFrame pipePick | ||
78 | case LC.glOutputs pipePick of | ||
79 | [LC.GLOutputRenderTexture (fromIntegral -> fbo) _rendTex] -> do | ||
80 | rtexPicks <- collectPicks fbo pickPoints | ||
81 | printPicks pickPoints rtexPicks | ||
82 | x -> error $ "Unexpected outputs: " <> show x | ||
83 | |||
84 | -- render to framebuffer & pick | ||
85 | LambdaCubeGL.renderFrame pipeDraw | ||
86 | colorPicks <- collectPicks 0 pickPoints | ||
87 | printPicks pickPoints colorPicks | ||
88 | |||
89 | GLFW.swapBuffers win | ||
90 | GLFW.pollEvents | ||
91 | |||
92 | let keyIsPressed k = fmap (==KeyState'Pressed) $ GLFW.getKey win k | ||
93 | escape <- keyIsPressed Key'Escape | ||
94 | if escape then return () else loop | ||
95 | collectPicks :: Int -> [(Int, Int)] -> IO [Int] | ||
96 | collectPicks fb picks = | ||
97 | forM picks $ (fromIntegral <$>) . pickFrameBuffer fb screenDim | ||
98 | printPicks pickPoints colorPicks = do | ||
99 | forM_ (zip pickPoints colorPicks) $ \((x,y), col)-> do | ||
100 | printf "%d:%d: %x " x y col | ||
101 | putStrLn "" | ||
102 | |||
103 | LambdaCubeGL.disposeRenderer pipePick | ||
104 | LambdaCubeGL.disposeRenderer pipeDraw | ||
105 | LambdaCubeGL.disposeStorage storage | ||
106 | GLFW.destroyWindow win | ||
107 | GLFW.terminate | ||
108 | |||
109 | deriving instance Show (LC.GLOutput) | ||
110 | deriving instance Show (LC.GLTexture) | ||
111 | |||
112 | -- geometry data: triangles | ||
113 | scale = 250.0 | ||
114 | s = scale | ||
115 | |||
116 | triangleA :: LambdaCubeGL.Mesh | ||
117 | triangleA = Mesh | ||
118 | { mAttributes = Map.fromList | ||
119 | [ ("position", A_V2F $ V.fromList [V2 s s, V2 s (-s), V2 (-s) (-s)]) | ||
120 | , ("color", A_V4F $ V.fromList $ take 4 $ repeat $ V4 1 0 0 1) | ||
121 | , ("id", A_Int $ V.fromList [1, 1, 1]) | ||
122 | ] | ||
123 | , mPrimitive = P_Triangles | ||
124 | } | ||
125 | |||
126 | triangleB :: LambdaCubeGL.Mesh | ||
127 | triangleB = Mesh | ||
128 | { mAttributes = Map.fromList | ||
129 | [ ("position", A_V2F $ V.fromList [V2 s s, V2 (-s) (-s), V2 (-s) s]) | ||
130 | , ("color", A_V4F $ V.fromList $ take 4 $ repeat $ V4 0 0 1 1) | ||
131 | , ("id", A_Int $ V.fromList [2, 2, 2]) | ||
132 | ] | ||
133 | , mPrimitive = P_Triangles | ||
134 | } | ||
135 | |||
136 | vec4ToV4F :: Vec4 -> LCLin.V4F | ||
137 | vec4ToV4F (Vc.Vec4 x y z w) = LCLin.V4 x y z w | ||
138 | |||
139 | mat4ToM44F :: Mat4 -> LCLin.M44F | ||
140 | mat4ToM44F (Mat4 a b c d) = LCLin.V4 (vec4ToV4F a) (vec4ToV4F b) (vec4ToV4F c) (vec4ToV4F d) | ||
141 | |||
142 | screenM :: Int -> Int -> Mat4 | ||
143 | screenM w h = scaleM | ||
144 | where (fw, fh) = (fromIntegral w, fromIntegral h) | ||
145 | scaleM = Vc.Mat4 (Vc.Vec4 (1/fw) 0 0 0) | ||
146 | (Vc.Vec4 0 (1/fh) 0 0) | ||
147 | (Vc.Vec4 0 0 1 0) | ||
148 | (Vc.Vec4 0 0 0 0.5) | ||
149 | |||
150 | pickFrameBuffer | ||
151 | :: Int -- ^ framebuffer | ||
152 | -> (Int, Int) -- ^ FB dimensions | ||
153 | -> (Int, Int) -- ^ pick coordinates | ||
154 | -> IO F.Word32 -- ^ resultant pixel value | ||
155 | pickFrameBuffer fb (w, h) (x, y) = do | ||
156 | glFinish | ||
157 | glBindFramebuffer GL_READ_FRAMEBUFFER $ fromIntegral fb | ||
158 | let (fbmode, format) = | ||
159 | if fb == 0 | ||
160 | then (GL_BACK_LEFT, GL_RGBA) | ||
161 | else (GL_COLOR_ATTACHMENT0, GL_RGBA_INTEGER) | ||
162 | glReadBuffer fbmode | ||
163 | withFrameBuffer w format x (h - y - 1) 1 1 $ \p -> fromIntegral <$> F.peek (F.castPtr p :: F.Ptr F.Word32) | ||
164 | |||
165 | withFrameBuffer :: Int -> GLenum -> Int -> Int -> Int -> Int -> (F.Ptr F.Word8 -> IO a) -> IO a | ||
166 | withFrameBuffer rowLen format x y w h fn = F.allocaBytes (w*h*4) $ \p -> do | ||
167 | glPixelStorei GL_UNPACK_LSB_FIRST 0 | ||
168 | glPixelStorei GL_UNPACK_SWAP_BYTES 0 | ||
169 | glPixelStorei GL_UNPACK_ROW_LENGTH $ fromIntegral rowLen | ||
170 | glPixelStorei GL_UNPACK_IMAGE_HEIGHT 0 | ||
171 | glPixelStorei GL_UNPACK_SKIP_ROWS 0 | ||
172 | glPixelStorei GL_UNPACK_SKIP_PIXELS 0 | ||
173 | glPixelStorei GL_UNPACK_SKIP_IMAGES 0 | ||
174 | glPixelStorei GL_UNPACK_ALIGNMENT 1 | ||
175 | glReadPixels (fromIntegral x) (fromIntegral y) (fromIntegral w) (fromIntegral h) format GL_UNSIGNED_BYTE $ F.castPtr p | ||
176 | glPixelStorei GL_UNPACK_ROW_LENGTH 0 | ||
177 | fn p | ||
178 | |||
179 | initWindow :: String -> Int -> Int -> IO Window | ||
180 | initWindow title width height = do | ||
181 | GLFW.init | ||
182 | GLFW.defaultWindowHints | ||
183 | mapM_ GLFW.windowHint | ||
184 | [ WindowHint'ContextVersionMajor 3 | ||
185 | , WindowHint'ContextVersionMinor 3 | ||
186 | , WindowHint'OpenGLProfile OpenGLProfile'Core | ||
187 | , WindowHint'OpenGLForwardCompat True | ||
188 | ] | ||
189 | Just win <- GLFW.createWindow width height title Nothing Nothing | ||
190 | GLFW.makeContextCurrent $ Just win | ||
191 | return win | ||
192 | |||