diff --git a/Geometry/Class.hs b/Geometry/Class.hs new file mode 100644 --- /dev/null +++ b/Geometry/Class.hs @@ -0,0 +1,15 @@ +{-# LANGUAGE MultiParamTypeClasses, FunctionalDependencies #-} +module Geometry.Class where + +class Geometry point geodesic | point -> geodesic, geodesic -> point where + distance :: point -> point -> Double + angle :: point -> point -> point -> Double + geodesic :: point -> point -> geodesic + rotate :: Double -> point -> point -> point + translate :: Double -> geodesic -> point -> point + midpoint :: point -> point -> point + midpoint p q = translate (distance p q / 2) (geodesic p q) p + +class Embedding model point where + embed :: point -> model + model :: model -> Maybe point diff --git a/Geometry/Flat/ThreeD/Space.hs b/Geometry/Flat/ThreeD/Space.hs new file mode 100644 --- /dev/null +++ b/Geometry/Flat/ThreeD/Space.hs @@ -0,0 +1,46 @@ +{-# LANGUAGE MultiParamTypeClasses #-} +module Geometry.Flat.ThreeD.Space + ( Point(..) + , Geodesic(..) + ) where + +import Geometry.Class +import qualified Geometry.Flat.TwoD.Space as E + +data Point = Point{ pX, pY, pZ :: !Double } deriving Show +data Geodesic = Geodesic{ gO :: !Point, gX, gY, gZ :: !Double } deriving Show + +instance Geometry Point Geodesic where + + distance (Point u v w) (Point x y z) = + let dx = x - u + dy = y - v + dz = z - w + in sqrt (dx * dx + dy * dy + dz * dz) + + angle _ _ _ = error "Geometry.Flat.ThreeD.Space.angle" + + geodesic p@(Point u v w) (Point x y z) = + let dx = x - u + dy = y - v + dz = z - w + d = sqrt (dx * dx + dy * dy + dz * dz) + in Geodesic p (dx / d) (dy / d) (dz / d) + + rotate _ _ _ = error "Geometry.Flat.ThreeD.Space.rotate" + + translate d (Geodesic _ dx dy dz) (Point x y z) = + Point (x + d * dx) (y + d * dy) (z + d * dz) + + midpoint (Point u v w) (Point x y z) = + Point (0.5 * (u + x)) (0.5 * (v + y)) (0.5 * (w + z)) + +instance Embedding Point Point where + embed = id + model = Just + +instance Embedding Point E.Point where + embed (E.Point x y) = Point x y 0 + model (Point x y z) + | z == 0 = Just (E.Point x y) + | otherwise = Nothing diff --git a/Geometry/Flat/TwoD/Space.hs b/Geometry/Flat/TwoD/Space.hs new file mode 100644 --- /dev/null +++ b/Geometry/Flat/TwoD/Space.hs @@ -0,0 +1,48 @@ +{-# LANGUAGE MultiParamTypeClasses #-} +module Geometry.Flat.TwoD.Space + ( Point(..) + , Geodesic(..) + ) where + +import Geometry.Class +import Geometry.Utils (fixAngle) + +data Point = Point{ pX, pY :: !Double } deriving Show +data Geodesic = Geodesic{ gO :: !Point, gX, gY :: !Double } deriving Show + +instance Geometry Point Geodesic where + + distance (Point u v) (Point x y) = + let dx = x - u + dy = y - v + in sqrt (dx * dx + dy * dy) + + angle (Point p q) (Point u v) (Point x y) = + let du = u - p + dv = v - q + dx = x - p + dy = y - q + uv = atan2 dv du + xy = atan2 dy dx + in fixAngle (xy - uv) + + geodesic p@(Point u v) (Point x y) = + let dx = x - u + dy = y - v + d = sqrt (dx * dx + dy * dy) + in Geodesic p (dx / d) (dy / d) + + rotate a (Point u v) (Point x y) = + let co = cos a + si = sin a + p = x - u + q = y - v + in Point (u + co * p - si * q) (v + si * p + co * q) + + translate d (Geodesic _ dx dy) (Point x y) = Point (x + d * dx) (y + d * dy) + + midpoint (Point u v) (Point x y) = Point (0.5 * (u + x)) (0.5 * (v + y)) + +instance Embedding Point Point where + embed = id + model = Just diff --git a/Geometry/Flat/TwoD/Tessellation/Triangular.hs b/Geometry/Flat/TwoD/Tessellation/Triangular.hs new file mode 100644 --- /dev/null +++ b/Geometry/Flat/TwoD/Tessellation/Triangular.hs @@ -0,0 +1,68 @@ +module Geometry.Flat.TwoD.Tessellation.Triangular + ( tessellate + , Triangle(..) + , Vertex(..) + ) where + +import Geometry.Flat.TwoD.Space + +data Triangle a = Triangle a a a deriving Show + +data Vertex = Vertex{ vPos, vTex :: !Point, vSpots, vWings, vBody :: !Double } + deriving Show + +tessellate :: Int -> Int -> Double -> Point -> Point -> [Triangle Vertex] +tessellate p q s (Point lx ly) (Point hx hy) = + let t = s * sqrt 3 / 2 + y = floor (ly / t) + x = floor (lx / s) + w = ceiling ((hx - lx) / s) + h = ceiling ((hy - ly) / t) + g = grid p q + pc u v = (Point (s * (fromIntegral u + fromIntegral v / 2)) (t * fromIntegral v), g u v) + b (p0@(Point x0 y0), h0) (Point x1 y1, h1) (Point x2 y2, h2) = + let pTL = p0 + pTM = Point ((2 * x0 + x1) / 3) ((2 * y0 + y1) / 3) + pTR = Point ((x0 + 2 * x1) / 3) ((y0 + 2 * y1) / 3) + pBL = Point ((2 * x0 + x2) / 3) ((2 * y0 + y2) / 3) + pBR = Point ((x0 + x1 + x2) / 3) ((y0 + y1 + y2) / 3) + tTL = Point 0 1 + tTM = Point 0.5 1 + tTR = Point 1 1 + tBL = Point 0.25 0 + tBR = Point 0.75 0 + v pp tt = Vertex pp tt h0 h2 h1 + vTL = v pTL tTL + vTM = v pTM tTM + vTR = v pTR tTR + vBL = v pBL tBL + vBR = v pBR tBR + in [ Triangle vTL vTM vBL + , Triangle vTM vTR vBR + , Triangle vBL vTM vBR + ] + bs v0 v1 v2 = concat + [ b v0 v1 v2 + , b v1 v2 v0 + , b v2 v0 v1 + ] + tris u v = concat + [ bs (pc u v) (pc (u+1) v) (pc u (v+1)) + , bs (pc (u+1) v) (pc (u+1) (v+1)) (pc u (v+1)) + ] + in concat + [ tris (u - z) v + | v <- [y .. y + h] + , let z = (v + 1) `div` 2 + , u <- [x .. x + w] + ] + +grid :: Int -> Int -> Int -> Int -> Double +grid p q = + let n = p * p + q * q + p * q + i = p `gcd` q + j = n `div` i + o = head [ o' | o' <- [0 .. j - 1], (p + q) `mod` j == (o' * i * (q `div` i)) `mod` j ] + in \x y -> + let d = i * (y `div` i) + in fromIntegral (((x + o * d) `mod` j) + j * (y `mod` i)) diff --git a/Geometry/Hyperbolic/TwoD/HalfSpace.hs b/Geometry/Hyperbolic/TwoD/HalfSpace.hs new file mode 100644 --- /dev/null +++ b/Geometry/Hyperbolic/TwoD/HalfSpace.hs @@ -0,0 +1,109 @@ +{-# LANGUAGE MultiParamTypeClasses #-} +module Geometry.Hyperbolic.TwoD.HalfSpace + ( Point(..) + , Geodesic(..) + ) where + +import Data.Fixed (mod') + +import Geometry.Class +import qualified Geometry.Flat.TwoD.Space as E + +data Point = Point{ pX, pY :: !Double } deriving Show + +data Geodesic + = Line{ gDir :: !Bool, gCX :: !Double } + | Arc { gDir :: !Bool, gCX :: !Double, gR :: !Double } + deriving Show + +instance Geometry Point Geodesic where + + distance p q = case geodesic p q of + Line{} -> abs (log (pY p / pY q)) + g@Arc{} -> + let a = gCX g - gR g + b = gCX g + gR g + pa = sqrt ((pX p - a) * (pX p - a) + pY p * pY p) + pb = sqrt ((pX p - b) * (pX p - b) + pY p * pY p) + qa = sqrt ((pX q - a) * (pX q - a) + pY q * pY q) + qb = sqrt ((pX q - b) * (pX q - b) + pY q * pY q) + in abs (log ((pa / pb) / (qa / qb))) + + angle _ _ _ = error "Geometry.Hyperbolic.TwoD.HalfPlane.angle" + + geodesic p q + | abs (pX p - pX q) < eps = + Line{ gCX = 0.5 * (pX p + pX q), gDir = pY p < pY q } + | otherwise = + let cx = 0.5 * (pX q * pX q + pY q * pY q - pX p * pX p - pY p * pY p) / (pX q - pX p) + r = sqrt ((pX p - cx) * (pX p - cx) + pY p * pY p) + in Arc{ gCX = cx, gDir = pX p < pX q, gR = r } + + rotate a p q = + let g = geodesic p q + b = angleAt g p + h = fromPointAngle p (b + a) + d = distance p q + in translate d h p + + translate d g p = atDist g p (abs d) (d >= 0) + +instance Embedding Point Point where + embed = id + model = Just + +instance Embedding E.Point Point where + embed (Point x y) = E.Point x y + model (E.Point x y) + | y > 0 = Just (Point x y) + | otherwise = Nothing + +eps :: Double +eps = 1e-12 + +atParam :: Geodesic -> Double -> Point +atParam g@Line{} t = Point (gCX g) t +atParam g@Arc {} t = Point (gR g * cos (pi - t) + gCX g) (gR g * sin t) + +paramAt :: Geodesic -> Point -> Double +paramAt Line{} p = pY p +paramAt g@Arc {} p = pi - atan2 (pY p) (pX p - gCX g) + +angleAt :: Geodesic -> Point -> Double +angleAt g@Line{} _ = (if gDir g then (subtract pi) else id) (pi/2) +angleAt g@Arc {} p = (if gDir g then (pi +) else id) (atan2 (pY p) (pX p - gCX g) + pi/2) + +fromPointAngle :: Point -> Double -> Geodesic +fromPointAngle p a + | abs ((a `mod'` pi) - pi/2) < eps = + Line{ gCX = pX p, gDir = cos a >= 0 } + | otherwise = + let b = a + pi/2 + co = cos b + si = sin b + r = abs (pY p / si) + cx = -(pY p * co - pX p * si) / si + in Arc{ gCX = cx, gDir = cos a >= 0, gR = r } + +atDist :: Geodesic -> Point -> Double -> Bool -> Point +atDist g@Line{} p d dir + | dir /= gDir g = binarySearch g p d (0 + eps) pp (<) + | otherwise = binarySearch g p d pp (pp * 100) (>) + where pp = paramAt g p +atDist g@Arc {} p d dir + | dir /= gDir g = binarySearch g p d (0 + eps) pp (<) + | otherwise = binarySearch g p d pp (pi - eps) (>) + where pp = paramAt g p + +binarySearch :: Geodesic -> Point -> Double -> Double -> Double -> (Double -> Double -> Bool) -> Point +binarySearch g p d lo0 hi0 cmp = go lo0 hi0 + where + go lo hi = + let mid = 0.5 * (lo + hi) + q = atParam g mid + m = distance p q + in if hi - lo < eps + then q + else if m `cmp` d + then go lo mid + else go mid hi diff --git a/Geometry/Utils.hs b/Geometry/Utils.hs new file mode 100644 --- /dev/null +++ b/Geometry/Utils.hs @@ -0,0 +1,10 @@ +module Geometry.Utils + ( fixAngle + ) where + +import Data.Fixed (mod') + +fixAngle :: Double -> Double +fixAngle a = + let b = a `mod'` (2 * pi) + in if b > pi then b - 2 * pi else b diff --git a/LICENSE b/LICENSE new file mode 100644 --- /dev/null +++ b/LICENSE @@ -0,0 +1,675 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + 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. 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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/README b/README new file mode 100644 --- /dev/null +++ b/README @@ -0,0 +1,28 @@ +butterflies -- butterfly tilings +Copyright (C) 2013 Claude Heiland-Allen + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . + + +Example usage: + + #!/bin/bash + for s in $(seq 2 5) + do + for p in $(seq 0 $((s/2))) + do + q=$((s-p)) + butterflies-flat $q $p -geometry 1024x1024 + done + done 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/butterflies.cabal b/butterflies.cabal new file mode 100644 --- /dev/null +++ b/butterflies.cabal @@ -0,0 +1,55 @@ +name: butterflies +version: 0.3.0.1 +synopsis: butterfly tilings +description: various tilings with butterflies (after M C Escher 1950) +homepage: http://code.mathr.co.uk/butterflies +license: GPL-3 +license-file: LICENSE +author: Claude Heiland-Allen +maintainer: claude@mathr.co.uk +copyright: (C) 2013,2015 Claude Heiland-Allen +category: Graphics +build-type: Simple +cabal-version: >=1.8 + +extra-source-files: README +data-dir: data +data-files: + butterfly.png + palette.png + +library + exposed-modules: + Geometry.Class + Geometry.Flat.ThreeD.Space + Geometry.Flat.TwoD.Space + Geometry.Flat.TwoD.Tessellation.Triangular + Geometry.Hyperbolic.TwoD.HalfSpace + Geometry.Utils + build-depends: + base ==4.8.* + +executable butterflies-flat + hs-source-dirs: flat + main-is: Main.hs + other-modules: + Paths_butterflies + build-depends: + base ==4.8.*, + bytestring ==0.10.*, + OpenGLRaw ==2.6.*, + OpenGLRaw21 ==2.0.*, + GLUT ==2.7.*, + gl-capture ==0.1.*, + repa ==3.4.*, + repa-devil ==0.3.*, + butterflies ==0.3.0.1 + +source-repository head + type: git + location: http://code.mathr.co.uk/butterflies.git + +source-repository this + type: git + location: http://code.mathr.co.uk/butterflies.git + tag: v0.3.0.1 diff --git a/data/butterfly.png b/data/butterfly.png new file mode 100644 Binary files /dev/null and b/data/butterfly.png differ diff --git a/data/palette.png b/data/palette.png new file mode 100644 Binary files /dev/null and b/data/palette.png differ diff --git a/flat/Main.hs b/flat/Main.hs new file mode 100644 --- /dev/null +++ b/flat/Main.hs @@ -0,0 +1,215 @@ +{-# LANGUAGE TypeSynonymInstances #-} +module Main (main) where + +import Control.Monad (when) +import Foreign (Ptr, nullPtr, castPtr, plusPtr, advancePtr, allocaBytes, with, withArray, peek, poke, pokeByteOff) +import Foreign.C (CUChar) +import Foreign.C.String (withCString, peekCString) +import Foreign.ForeignPtr (withForeignPtr) +import System.Exit (exitSuccess) + +import Graphics.Rendering.OpenGL.Raw.Core21 +import Graphics.Rendering.OpenGL.Raw.ARB.ShaderObjects (glUniformMatrix4fvARB) +import Graphics.Rendering.OpenGL.Raw.ARB.FramebufferObjectCore (glGenerateMipmap) +import Graphics.Rendering.OpenGL.Capture (capturePPM) +import Graphics.UI.GLUT (getArgsAndInitialize, createWindow, displayCallback, ($=), swapBuffers, reportErrors, mainLoop) +import qualified Data.ByteString as BS +import Data.Array.Repa.IO.DevIL (runIL, readImage, Image(RGBA)) +import Data.Array.Repa.Repr.ForeignPtr (toForeignPtr) + +import Paths_butterflies (getDataFileName) + +import Geometry.Flat.TwoD.Space +import Geometry.Flat.TwoD.Tessellation.Triangular + +swarm' p q = tessellate p q 3 (Point (-12) (-12)) (Point 12 12) + +class GLPoke t where glPoke :: t -> Ptr t -> IO (Ptr t) +instance GLPoke t => GLPoke [t] where + glPoke [] p = return p + glPoke (x:xs) p = glPoke x (castPtr p) >>= glPoke xs . castPtr + +instance GLPoke GLfloat where glPoke x p = poke p x >> return (advancePtr p 1) +instance GLPoke Double where + glPoke x p = do + p <- glPoke (realToFrac x :: GLfloat) (castPtr p) + return (castPtr p) +instance GLPoke Point where + glPoke (Point x y) p = do + p <- glPoke x (castPtr p) + p <- glPoke y p + return (castPtr p) +instance GLPoke Vertex where + glPoke (Vertex vp vt h0 h1 h2) p = do + p <- glPoke [vp, vt] (castPtr p) + p <- glPoke [h0, h1, h2] (castPtr p) + return (castPtr p) +instance GLPoke a => GLPoke (Triangle a) where + glPoke (Triangle a b c) p = do + p <- glPoke [a,b,c] (castPtr p) + return (castPtr p) + +vert = unlines + [ "#version 120" + , "uniform mat4 mvp;" + , "attribute vec2 p0;" + , "attribute vec2 t0;" + , "attribute vec3 c0;" + , "varying vec2 t;" + , "varying vec3 c;" + , "void main() {" + , " gl_Position = vec4(vec2(vec4(p0, 0.0, 1.0) * mvp), 0.0, 1.0);" + , " t = t0;" + , " c = c0;" + , "}" + ] + +frag = unlines + [ "#version 120" + , "uniform sampler2D tex;" + , "uniform sampler1D pal;" + , "varying vec2 t;" + , "varying vec3 c;" + , "const float phi1 = (sqrt(5.0) - 1.0) / 2.0;" + , "const float phi2 = (sqrt(5.0) - 2.0) / 2.0;" + , "vec4 colour(float i) {" + , " float j = 1.0/6.0 - phi1 * i;" + , " float k = phi2 * i;" + , " j -= floor(j);" + , " k -= floor(k);" + , " k *= -0.5;" + , " k += 1.0;" + , " return vec4(texture1D(pal, j).rgb * k, 1.0);" + , "}" + , "void main() {" + , " vec4 w = texture2D(tex, t);" + , " vec4 f = vec4(0.0);" + , " if (w.a <= 0.5) {" + , " f = vec4(0.5, 0.5, 0.5, 1.0);" + , " } else if (w.r >= 0.5 && w.g >= 0.5 && w.b >= 0.5) {" + , " f = vec4(1.0, 1.0, 1.0, 1.0);" + , " } else if (w.r <= 0.5 && w.g <= 0.5 && w.b <= 0.5) {" + , " f = vec4(0.0, 0.0, 0.0, 1.0);" + , " } else {" + , " float k = 0.0;" + , " if (w.r >= 0.5) {" + , " k = c.r;" + , " } else if (w.g >= 0.5) {" + , " k = c.g;" + , " } else if (w.b >= 0.5) {" + , " k = c.b;" + , " }" + , " f = colour(k);" + , " }" + , " gl_FragColor = f;" + , "}" + ] + +main = do + (_, [sp, sq]) <- getArgsAndInitialize + _ <- createWindow "butterflies" + program <- compileProgram + glUseProgram program + loadTextures + let ip = read sp + iq = read sq + swarm = swarm' ip iq + count = length swarm * 3 + stride = 4 * (2 + 2 + 3) + bytes = count * fromIntegral stride + allocaBytes bytes $ \p -> do + glPoke swarm p + vbo <- with 0 $ \q -> glGenBuffers 1 q >> peek q + glBindBuffer gl_ARRAY_BUFFER vbo + glBufferData gl_ARRAY_BUFFER (fromIntegral bytes) p gl_STATIC_DRAW + att <- withCString "p0" $ glGetAttribLocation program + glVertexAttribPointer (fromIntegral att) 2 gl_FLOAT (fromIntegral gl_FALSE) stride (plusPtr nullPtr 0) + glEnableVertexAttribArray (fromIntegral att) + att <- withCString "t0" $ glGetAttribLocation program + glVertexAttribPointer (fromIntegral att) 2 gl_FLOAT (fromIntegral gl_FALSE) stride (plusPtr nullPtr (2 * 4)) + glEnableVertexAttribArray (fromIntegral att) + att <- withCString "c0" $ glGetAttribLocation program + glVertexAttribPointer (fromIntegral att) 3 gl_FLOAT (fromIntegral gl_FALSE) stride (plusPtr nullPtr (4 * 4)) + glEnableVertexAttribArray (fromIntegral att) + let s = 10 + l = -s + r = s + t = -s + b = s + n = -1 + f = 1 + ortho = [ 2 / (r - l), 0, 0, -(r + l) / (r - l) + , 0, 2 / (t - b), 0, -(t + b) / (t - b) + , 0, 0, 2 / (f - n), -(f + n) / (f - n) + , 0, 0, 0, 1 ] + withArray ortho $ \p -> do + loc <- withCString "mvp" $ glGetUniformLocation program + glUniformMatrix4fvARB loc 1 (fromIntegral gl_FALSE) p + loc <- withCString "tex" $ glGetUniformLocation program + glUniform1i loc 0 + loc <- withCString "pal" $ glGetUniformLocation program + glUniform1i loc 1 + glClearColor 0.5 0.5 0.5 1 + displayCallback $= do + glClear gl_COLOR_BUFFER_BIT + glDrawArrays gl_TRIANGLES 0 (fromIntegral count) + swapBuffers + let ipq = ip * ip + iq * iq + ip * iq + capturePPM >>= BS.writeFile ("tessellation-" ++ (if ipq < 10 then "0" else "") ++ show ipq ++ "-" ++ show ip ++ "-" ++ show iq ++ ".ppm") + reportErrors + exitSuccess + mainLoop + +loadTextures = do + RGBA img <- getDataFileName "butterfly.png" >>= runIL . readImage + withForeignPtr (toForeignPtr img) $ \p -> do + tex <- with 0 $ \q -> glGenTextures 1 q >> peek q + glBindTexture gl_TEXTURE_2D tex + glTexImage2D gl_TEXTURE_2D 0 (fromIntegral gl_RGBA) 1024 1024 0 gl_RGBA gl_UNSIGNED_BYTE p + glTexParameteri gl_TEXTURE_2D gl_TEXTURE_MIN_FILTER (fromIntegral gl_LINEAR_MIPMAP_LINEAR) + glTexParameteri gl_TEXTURE_2D gl_TEXTURE_MAG_FILTER (fromIntegral gl_LINEAR) + glGenerateMipmap gl_TEXTURE_2D + glActiveTexture gl_TEXTURE1 + RGBA img <- getDataFileName "palette.png" >>= runIL . readImage + withForeignPtr (toForeignPtr img) $ \p -> do + tex <- with 0 $ \q -> glGenTextures 1 q >> peek q + glBindTexture gl_TEXTURE_1D tex + glTexImage1D gl_TEXTURE_1D 0 (fromIntegral gl_RGBA) 256 0 gl_RGBA gl_UNSIGNED_BYTE p + glTexParameteri gl_TEXTURE_1D gl_TEXTURE_MIN_FILTER (fromIntegral gl_NEAREST) + glTexParameteri gl_TEXTURE_1D gl_TEXTURE_MAG_FILTER (fromIntegral gl_NEAREST) + +compileProgram = do + program <- glCreateProgram + compileShader program gl_VERTEX_SHADER vert + compileShader program gl_FRAGMENT_SHADER frag + glLinkProgram program + debugProgram program + return program + +compileShader program t src = do + shader <- glCreateShader t + withCString src $ \srcp -> with srcp $ \srcpp -> glShaderSource shader 1 srcpp nullPtr + glCompileShader shader + glAttachShader program shader + debugShader shader + glDeleteShader shader + +debugProgram program = do + if program /= 0 + then do + linked <- with 0 $ \p -> glGetProgramiv program gl_LINK_STATUS p >> peek p + when (linked /= fromIntegral gl_TRUE) $ putStrLn "link failed" + len <- with 0 $ \p -> glGetProgramiv program gl_INFO_LOG_LENGTH p >> peek p + when (len > 1) $ do + allocaBytes (fromIntegral len + 1) $ \p -> glGetProgramInfoLog program len nullPtr p >> pokeByteOff p (fromIntegral len) (0 :: CUChar) >> peekCString p >>= putStrLn + else putStrLn "no program" + +debugShader shader = do + if shader /= 0 + then do + compiled <- with 0 $ \p -> glGetShaderiv shader gl_COMPILE_STATUS p >> peek p + when (compiled /= fromIntegral gl_TRUE) $ putStrLn "compile failed" + len <- with 0 $ \p -> glGetShaderiv shader gl_INFO_LOG_LENGTH p >> peek p + when (len > 1) $ do + allocaBytes (fromIntegral len + 1) $ \p -> glGetShaderInfoLog shader len nullPtr p >> pokeByteOff p (fromIntegral len) (0 :: CUChar) >> peekCString p >>= putStrLn + else putStrLn "no shader"