gearbox (empty) → 1

raw patch · 4 files changed

+1027/−0 lines, 4 filesdep +GLUTdep +OpenGLRawdep +Vecsetup-changed

Dependencies added: GLUT, OpenGLRaw, Vec, Vec-OpenGLRaw, base

Files

• GearBox.hs +333/−0
• LICENSE +675/−0
• Setup.hs +2/−0
• gearbox.cabal +17/−0

@@ -0,0 +1,333 @@+-- GearBox -- zooming rotating fractal gearbox demo+-- (GPL3+) 2012 Claude Heiland-Allen <claudiusmaximus@goto10.org>+-- usage: gearbox <quality>+-- default quality is 9, useful range 6-14+-- 'f' toggles full screen, any other key to quit+-- tested with: ghc-7.0.4, ghc-7.4-rc1++{-# LANGUAGE TypeOperators #-}+import Control.Monad (forM, forM_, replicateM)+import Data.Fixed (mod')+import Data.IORef (IORef, newIORef, readIORef, modifyIORef)+import Data.Vec hiding (last, map, scale, take)+import Data.Vec.OpenGLRaw ()+import Foreign (Ptr, Storable(..), alloca, allocaArray, castPtr, nullPtr, with, withArray)+import Foreign.C (withCString, peekCStringLen)+import Graphics.UI.GLUT+  ( Size(Size)+  , DisplayMode(RGBMode, DoubleBuffered)+  , Key(Char)+  , KeyState(Down)+  , KeyboardMouseCallback+  , ($=)+  , addTimerCallback+  , createWindow+  , displayCallback+  , getArgsAndInitialize+  , initialDisplayMode+  , initialWindowSize+  , keyboardMouseCallback+  , mainLoop+  , postRedisplay+  , reportErrors+  , reshapeCallback+  , swapBuffers+  , fullScreenToggle+  )+import Graphics.Rendering.OpenGL.Raw+import System.Exit (exitSuccess)++-- 4x4 matrix type+type R = GLdouble+type V = R :. R :. R :. R :. ()+type M = V :. V :. V :. V :. ()++-- length of animation loop in frames+looplength :: Int+looplength = 60 * 25++-- number of passes to iterate function system+passes :: Int+passes = 6++-- state for callbacks+data IFS = IFS+  -- immutable state+  { fbo :: GLuint+  , t_source, t_ping, t_pong :: GLuint+  , p_shift :: GLuint, p_shift_u_t, p_shift_u_k :: GLint+  , w_tsize, w_width, w_height :: Int+  -- mutable state+  , w_frame :: Int, w_phase :: GLdouble+  }++-- shader to generate a single blue gear wheel+gear_frag_src :: String+gear_frag_src = unlines+  [ "void main() {"+  , "  vec2 p = (gl_TexCoord[0].xy - vec2(0.5)) * 2.0;"+  , "  float r = length(p);"+  , "  float a = atan(p.y, p.x);"+  , "  float ro = 0.94 + 0.03 * sin(30.0 * a);"+  , "  float ri = 0.82 - 0.01 * sin(90.0 * a);"+  , "  if (r < ro) {"+  , "    gl_FragColor = ri < r ? vec4(0.5,0.5,1.0,1.0) : vec4(0.25,0.25,0.5,1.0);"+  , "  } else {"+  , "    discard;"+  , "  }"+  , "}"+  ]++-- shader to rotate colours in YUV space+shift_frag_src :: String+shift_frag_src = unlines+  [ "uniform sampler2D t;"+  , "uniform float k;"+  , ""+  , "void main() {"+  , "  float c = cos(6.283185307179586 * k);"+  , "  float s = sin(6.283185307179586 * k);"+  , "  vec4 p = texture2D(t, gl_TexCoord[0].xy).rgba;"+  , "  mat3 yuv2rgb = mat3(1.0, 0.0, 1.28033, 1.0, -0.21482, -0.38059, 1.0, 2.12798, 0.0);" -- rec.709+  , "  mat3 rgb2yuv = mat3(0.2126, 0.7152, 0.0722, -0.09991, -0.33609, 0.43600, 0.615, -0.5586, -0.05639);"+  , "  p.rgb = clamp(p.rgb * rgb2yuv * mat3(1, 0, 0, 0, c, s, 0, -s, c) * yuv2rgb, 0.0, 1.0);"+  , "  gl_FragColor = p;"+  , "}"+  ]++-- draw a textured quad+unitQuad :: IO ()+unitQuad = do+  glBegin gl_QUADS+  glTexCoord2f 0 0+  glVertex2f (-1) (-1)+  glTexCoord2f 1 0+  glVertex2f 1 (-1)+  glTexCoord2f 1 1+  glVertex2f 1 1+  glTexCoord2f 0 1+  glVertex2f (-1) 1+  glEnd++-- load a matrix into GL+loadMatrix :: M -> IO ()+loadMatrix ((a:.b:.c:.d:.()):.(e:.f:.g:.h:.()):.(i:.j:.k:.l:.()):.(m:.n:.o:.p:.()):.()) =+  withArray [a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p] $ glLoadMatrixd++-- helper for ping-pong technique+swap :: (a, b) -> (b, a)+swap ~(a,b) = (b,a)++-- simple transformations+scale :: R -> M+scale s = diagonal (s :. s :. s :. 1 :. ())+mirror :: M+mirror = diagonal (1 :. (-1) :. 1 :. 1 :. ())+rotateXY :: R -> M+rotateXY t = (c:.s:.0:.0:.()):.((-s):.c:.0:.0:.()):.(0:.0:.1:.0:.()):.(0:.0:.0:.1:.()):.()+  where c = cos t ; s = sin t+translateX :: R -> M+translateX d = (1:.0:.0:.0:.()):.(0:.1:.0:.0:.()):.(0:.0:.1:.0:.()):.(d:.0:.0:.1:.()):.()+(<>) :: M -> M -> M+(<>) = multmm++-- display callback+display :: IORef IFS -> IO ()+display ifsR = do+  ifs <- readIORef ifsR+  -- compute transforms for iterated function system fractal+  let p0 = w_phase ifs+      f0 = w_frame ifs+      q = f0 `mod` looplength+      k = q < (looplength `div` 2)+      p = if k then p0 else -p0+      s = 0.28+      d = 0.54+      transforms =+        [ identity+        , mirror <> scale s <> rotateXY ( 4 * p)+        ] ++ +        [ mirror <> scale s <> rotateXY (-3 * p) <> translateX d <>+          rotateXY (2 * pi * fromIntegral (if k then i else -i) / 5 + p)+        | i <- [0 .. 4 :: Int]+        ]+  -- iterated function system from gear to gears+  glViewport 0 0 (fromIntegral $ w_tsize ifs) (fromIntegral $ w_tsize ifs)+  glMatrixMode gl_PROJECTION+  glLoadIdentity+  glOrtho (-1) 1 (-1) 1 (-1) 1+  glMatrixMode gl_MODELVIEW+  glLoadIdentity+  glBindFramebuffer gl_FRAMEBUFFER (fbo ifs)+  glUseProgramObject (fromIntegral $ p_shift ifs)+  glUniform1i (p_shift_u_t ifs) 0+  to <- fmap last $ forM (take passes . ((True, (t_source ifs, t_ping ifs)) :) .+      zip (repeat False) $ (iterate swap (t_ping ifs, t_pong ifs))) $+      \(pass1, (ping, pong)) -> do+    glBindTexture gl_TEXTURE_2D ping+    glGenerateMipmap gl_TEXTURE_2D+    glFramebufferTexture2D gl_FRAMEBUFFER gl_COLOR_ATTACHMENT0 gl_TEXTURE_2D pong 0+    glClear (fromIntegral gl_COLOR_BUFFER_BIT)+    forM_ ([0 .. 6 :: Int] `zip` transforms) $ \(w, m) -> do+      let sk = case w of+            0 -> 0+            1 -> 0+            _ -> fromIntegral (4 * w - 7) / 10+      glUniform1f (p_shift_u_k ifs) sk+      loadMatrix $ (if pass1 && not k then rotateXY (pi / 30) else identity) <> m+      unitQuad+    glBindTexture gl_TEXTURE_2D 0+    glFramebufferTexture2D gl_FRAMEBUFFER gl_COLOR_ATTACHMENT0 gl_TEXTURE_2D 0 0+    return pong+  glUseProgramObject 0+  glBindFramebuffer gl_FRAMEBUFFER 0+  -- display the output scaled to the window+  let w = fromIntegral $ w_width  ifs+      h = fromIntegral $ w_height ifs+  glViewport 0 0 w h+  glClear (fromIntegral gl_COLOR_BUFFER_BIT)+  glMatrixMode gl_PROJECTION+  glLoadIdentity+  let (ax, ay)+        | w >= h = (1, fromIntegral h / fromIntegral w)+        | otherwise = (fromIntegral w / fromIntegral h, 1)+  glOrtho (-ax) ax (-ay) ay (-1) 1+  glMatrixMode gl_MODELVIEW+  glLoadIdentity+  glBindTexture gl_TEXTURE_2D to+  glGenerateMipmap gl_TEXTURE_2D+  loadMatrix $ scale 1.5 <>+    scale (s ** negate ((p0 / (2 * pi)) `mod'` 1)) <> rotateXY (- 2 * p)+  unitQuad+  glBindTexture gl_TEXTURE_2D 0+  -- animate+  modifyIORef ifsR $ \ifs' -> +     let w_frame' = w_frame ifs' + 1+     in  ifs'+           { w_frame = w_frame'+           , w_phase = fromIntegral w_frame' * 4 * pi / fromIntegral looplength+           }+  swapBuffers+  reportErrors++-- timer callback (25fps)+timer :: IORef IFS -> IO ()+timer ifsR = do+  addTimerCallback 40 (timer ifsR)+  postRedisplay Nothing++-- window reshape callback+reshape :: IORef IFS -> Size -> IO ()+reshape ifsR (Size w h) = modifyIORef ifsR $ \ifs -> ifs+  { w_width = fromIntegral w, w_height = fromIntegral h }++-- compile a shader+shader :: String -> IO (Either String GLuint)+shader frag = do+  p <- glCreateProgramObject+  f <- glCreateShaderObject gl_FRAGMENT_SHADER+  withCString frag $ \s -> with s $ \src -> do+    glShaderSource (fromIntegral f) 1 (castPtr src) nullPtr+    glCompileShader (fromIntegral f)+    glAttachObject p f+    glLinkProgram (fromIntegral p)+    alloca $ \sp -> do+      glGetObjectParameteriv (fromIntegral p) gl_OBJECT_LINK_STATUS sp+      success <- peek sp+      if (success == 0)+        then+          alloca $ \lp -> do+            glGetProgramiv (fromIntegral p) gl_INFO_LOG_LENGTH lp+            l <- peek lp+            poke lp 0+            allocaArray (fromIntegral l) $ \lg -> do+              glGetProgramInfoLog (fromIntegral p) (fromIntegral l) (castPtr lp) lg+              l' <- peek lp+              ss <- peekCStringLen (castPtr lg, fromIntegral l')+              return (Left ss)+        else return (Right (fromIntegral p))++-- generate a texture+newTexture :: Int -> IO GLuint+newTexture size = alloca $ \pt -> do+  glGenTextures 1 pt+  t <- peek pt+  glBindTexture gl_TEXTURE_2D t+  let s = fromIntegral size+  glTexImage2D gl_TEXTURE_2D 0 (fromIntegral gl_RGBA) s s 0+    gl_RGBA gl_UNSIGNED_BYTE (nullPtr :: Ptr GLubyte)+  glTexParameteri gl_TEXTURE_2D gl_TEXTURE_MIN_FILTER (fromIntegral gl_LINEAR_MIPMAP_LINEAR)+  glTexParameteri gl_TEXTURE_2D gl_TEXTURE_MAG_FILTER (fromIntegral gl_LINEAR)+  glTexParameteri gl_TEXTURE_2D gl_TEXTURE_WRAP_S (fromIntegral gl_CLAMP_TO_EDGE)+  glTexParameteri gl_TEXTURE_2D gl_TEXTURE_WRAP_T (fromIntegral gl_CLAMP_TO_EDGE)+  glBindTexture gl_TEXTURE_2D 0+  return t++-- keyboard callback+keyboard :: IORef IFS -> KeyboardMouseCallback+keyboard _  (Char 'f') Down _ _ = fullScreenToggle+keyboard _  (Char _) Down _ _ = exitSuccess+keyboard _ _ _ _ _ = return ()++-- main program+main :: IO ()+main = do+  let w = 512+      h = 288+  initialWindowSize $= Size (fromIntegral w) (fromIntegral h)+  initialDisplayMode $= [ RGBMode, DoubleBuffered ]+  (_, args) <- getArgsAndInitialize+  quality <- case map reads args of+    [[(q,"")]] | 5 < q && q < 15-> return q+    _ -> return (9 :: Int)+  let tsize' = 2 ^ quality+  _ <- createWindow "GearBox"+  -- compile shaders (FIXME: print log to stderr on failure and exit)+  Right p_shift' <- shader shift_frag_src+  p_shift_u_t' <- withCString "t" $ glGetUniformLocation p_shift' . castPtr+  p_shift_u_k' <- withCString "k" $ glGetUniformLocation p_shift' . castPtr+  Right p_gear' <- shader gear_frag_src+  -- misc setup+  glHint gl_GENERATE_MIPMAP_HINT gl_NICEST+  glEnable gl_TEXTURE_2D+  glEnable gl_BLEND+  glBlendFunc gl_SRC_ALPHA gl_ONE_MINUS_SRC_ALPHA+  glClearColor 0.25 0.25 0.5 0+  -- allocate textures+  [t_source', t_ping', t_pong'] <- replicateM 3 (newTexture tsize')+  -- allocate frame buffer+  fbo' <- alloca $ \p -> do+    glGenFramebuffers 1 p+    peek p+  -- initialize state+  ifsR <- newIORef IFS+    { fbo = fbo', t_source = t_source', t_ping = t_ping', t_pong = t_pong'+    , p_shift = p_shift', p_shift_u_t = p_shift_u_t', p_shift_u_k = p_shift_u_k'+    , w_width = w, w_height = h, w_tsize = tsize'+    , w_frame = 0, w_phase = 0+    }+  -- render the gear texture+  glViewport 0 0 (fromIntegral tsize') (fromIntegral tsize')+  glMatrixMode gl_PROJECTION+  glLoadIdentity+  glOrtho (-1) 1 (-1) 1 (-1) 1+  glMatrixMode gl_MODELVIEW+  glLoadIdentity+  glBindFramebuffer gl_FRAMEBUFFER fbo'+  glFramebufferTexture2D gl_FRAMEBUFFER gl_COLOR_ATTACHMENT0 gl_TEXTURE_2D t_source' 0+  glClear (fromIntegral gl_COLOR_BUFFER_BIT)+  glUseProgramObject (fromIntegral p_gear')+  unitQuad+  glUseProgramObject 0+  glFramebufferTexture2D gl_FRAMEBUFFER gl_COLOR_ATTACHMENT0 gl_TEXTURE_2D 0 0+  glBindFramebuffer gl_FRAMEBUFFER 0+  glBindTexture gl_TEXTURE_2D t_source'+  glGenerateMipmap gl_TEXTURE_2D+  glBindTexture gl_TEXTURE_2D 0+  -- set callbacks+  reshapeCallback $= Just (reshape ifsR)+  displayCallback $= display ifsR+  addTimerCallback 40 (timer ifsR)+  keyboardMouseCallback $= Just (keyboard ifsR)+  reportErrors+  mainLoop

@@ -0,0 +1,675 @@+              GNU GENERAL PUBLIC LICENSE+                Version 3, 29 June 2007++ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>+ Everyone is permitted to copy and distribute verbatim copies+ of this license document, but changing it is not allowed.++                     Preamble++  The GNU General Public License is a free, copyleft license for+software and other kinds of works.++  The licenses for most software and other practical works are designed+to take away your freedom to share and change the works.  By contrast,+the GNU General Public License is intended to guarantee your freedom to+share and change all versions of a program--to make sure it remains free+software for all its users.  We, the Free Software Foundation, use the+GNU General Public License for most of our software; it applies also to+any other work released this way by its authors.  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@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

@@ -0,0 +1,17 @@+Name:                gearbox+Version:             1+Synopsis:            zooming rotating fractal gears graphics demo+Description:         OpenGL gearbox iterated function system.  Usage:+                     @gearbox quality@ where quality is an integer between+                     6 and 14 (default 9).  Shaders generate a gear shape+                     and hue rotate succesive copies via texture feedback.+License:             GPL-3+License-file:        LICENSE+Author:              Claude Heiland-Allen+Maintainer:          claudiusmaximus@goto10.org+Category:            Demo+Build-type:          Simple+Cabal-version:       >=1.6+Executable gearbox+  Main-is:             GearBox.hs+  Build-depends:       base < 5, GLUT == 2.2.*, OpenGLRaw == 1.1.*, Vec == 0.9.*, Vec-OpenGLRaw == 0.2.*