diff --git a/GearBox.hs b/GearBox.hs new file mode 100644 --- /dev/null +++ b/GearBox.hs @@ -0,0 +1,333 @@ +-- GearBox -- zooming rotating fractal gearbox demo +-- (GPL3+) 2012 Claude Heiland-Allen +-- usage: gearbox +-- 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 diff --git a/LICENSE b/LICENSE new file mode 100644 --- /dev/null +++ b/LICENSE @@ -0,0 +1,675 @@ + GNU GENERAL 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. + diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/gearbox.cabal b/gearbox.cabal new file mode 100644 --- /dev/null +++ b/gearbox.cabal @@ -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.*