<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <!-- Generated by HsColour, http://www.cs.york.ac.uk/fp/darcs/hscolour/ --> <title>Graphics/Rendering/OpenGL/GLU/Tessellation.hs</title> <link type='text/css' rel='stylesheet' href='hscolour.css' /> </head> <body> <pre><a name="line-1"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-2"></a><span class='hs-comment'>-- |</span> <a name="line-3"></a><span class='hs-comment'>-- Module : Graphics.Rendering.OpenGL.GLU.Tessellation</span> <a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Sven Panne 2002-2009</span> <a name="line-5"></a><span class='hs-comment'>-- License : BSD-style (see the file libraries/OpenGL/LICENSE)</span> <a name="line-6"></a><span class='hs-comment'>-- </span> <a name="line-7"></a><span class='hs-comment'>-- Maintainer : sven.panne@aedion.de</span> <a name="line-8"></a><span class='hs-comment'>-- Stability : stable</span> <a name="line-9"></a><span class='hs-comment'>-- Portability : portable</span> <a name="line-10"></a><span class='hs-comment'>--</span> <a name="line-11"></a><span class='hs-comment'>-- This module corresponds to chapter 5 (Polygon Tessellation) of the GLU specs.</span> <a name="line-12"></a><span class='hs-comment'>--</span> <a name="line-13"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-14"></a> <a name="line-15"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>OpenGL</span><span class='hs-varop'>.</span><span class='hs-conid'>GLU</span><span class='hs-varop'>.</span><span class='hs-conid'>Tessellation</span> <span class='hs-layout'>(</span> <a name="line-16"></a> <span class='hs-comment'>-- * Polygon description</span> <a name="line-17"></a> <span class='hs-conid'>AnnotatedVertex</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>ComplexContour</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>ComplexPolygon</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <a name="line-18"></a> <a name="line-19"></a> <span class='hs-comment'>-- * Combining vertices</span> <a name="line-20"></a> <span class='hs-conid'>WeightedProperties</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Combiner</span><span class='hs-layout'>,</span> <a name="line-21"></a> <a name="line-22"></a> <span class='hs-comment'>-- * Tessellation parameters</span> <a name="line-23"></a> <span class='hs-conid'>TessWinding</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Tolerance</span><span class='hs-layout'>,</span> <a name="line-24"></a> <a name="line-25"></a> <span class='hs-comment'>-- * Tessellator type</span> <a name="line-26"></a> <span class='hs-conid'>Tessellator</span><span class='hs-layout'>,</span> <a name="line-27"></a> <a name="line-28"></a> <span class='hs-comment'>-- * Contour extraction</span> <a name="line-29"></a> <span class='hs-conid'>SimpleContour</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>PolygonContours</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>extractContours</span><span class='hs-layout'>,</span> <a name="line-30"></a> <a name="line-31"></a> <span class='hs-comment'>-- * Triangulation</span> <a name="line-32"></a> <span class='hs-conid'>TriangleVertex</span><span class='hs-layout'>,</span> <span class='hs-conid'>Triangle</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Triangulation</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>triangulate</span><span class='hs-layout'>,</span> <a name="line-33"></a> <a name="line-34"></a> <span class='hs-comment'>-- * Tessellation into primitives</span> <a name="line-35"></a> <span class='hs-conid'>Primitive</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>SimplePolygon</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>tessellate</span> <a name="line-36"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <a name="line-37"></a> <a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span> <span class='hs-varid'>foldM</span><span class='hs-layout'>,</span> <span class='hs-varid'>unless</span> <span class='hs-layout'>)</span> <a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <span class='hs-layout'>(</span> <span class='hs-varid'>newIORef</span><span class='hs-layout'>,</span> <span class='hs-varid'>readIORef</span><span class='hs-layout'>,</span> <span class='hs-varid'>writeIORef</span><span class='hs-layout'>,</span> <span class='hs-varid'>modifyIORef</span> <span class='hs-layout'>)</span> <a name="line-40"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span> <span class='hs-varid'>fromJust</span> <span class='hs-layout'>)</span> <a name="line-41"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Marshal</span><span class='hs-varop'>.</span><span class='hs-conid'>Alloc</span> <span class='hs-layout'>(</span> <span class='hs-varid'>allocaBytes</span> <span class='hs-layout'>)</span> <a name="line-42"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Marshal</span><span class='hs-varop'>.</span><span class='hs-conid'>Array</span> <span class='hs-layout'>(</span> <span class='hs-varid'>peekArray</span><span class='hs-layout'>,</span> <span class='hs-varid'>pokeArray</span> <span class='hs-layout'>)</span> <a name="line-43"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Marshal</span><span class='hs-varop'>.</span><span class='hs-conid'>Pool</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Pool</span><span class='hs-layout'>,</span> <span class='hs-varid'>withPool</span><span class='hs-layout'>,</span> <span class='hs-varid'>pooledNew</span> <span class='hs-layout'>)</span> <a name="line-44"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Ptr</span><span class='hs-layout'>,</span> <span class='hs-varid'>nullPtr</span><span class='hs-layout'>,</span> <span class='hs-varid'>plusPtr</span><span class='hs-layout'>,</span> <span class='hs-varid'>castPtr</span><span class='hs-layout'>,</span> <span class='hs-conid'>FunPtr</span><span class='hs-layout'>,</span> <span class='hs-varid'>freeHaskellFunPtr</span> <span class='hs-layout'>)</span> <a name="line-45"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Storable</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Storable</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span> <a name="line-46"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>OpenGL</span><span class='hs-varop'>.</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>BasicTypes</span> <span class='hs-layout'>(</span> <a name="line-47"></a> <span class='hs-conid'>GLboolean</span><span class='hs-layout'>,</span> <span class='hs-conid'>GLclampf</span><span class='hs-layout'>,</span> <span class='hs-conid'>GLdouble</span><span class='hs-layout'>,</span> <span class='hs-conid'>GLenum</span> <span class='hs-layout'>)</span> <a name="line-48"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>OpenGL</span><span class='hs-varop'>.</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>EdgeFlag</span> <span class='hs-layout'>(</span> <span class='hs-varid'>unmarshalEdgeFlag</span> <span class='hs-layout'>)</span> <a name="line-49"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>OpenGL</span><span class='hs-varop'>.</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span> <span class='hs-varid'>bracket</span> <span class='hs-layout'>)</span> <a name="line-50"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>OpenGL</span><span class='hs-varop'>.</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>GLboolean</span> <span class='hs-layout'>(</span> <span class='hs-varid'>marshalGLboolean</span> <span class='hs-layout'>)</span> <a name="line-51"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>OpenGL</span><span class='hs-varop'>.</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>PrimitiveMode</span> <span class='hs-layout'>(</span> <span class='hs-varid'>unmarshalPrimitiveMode</span> <span class='hs-layout'>)</span> <a name="line-52"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>OpenGL</span><span class='hs-varop'>.</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>BeginEnd</span> <span class='hs-layout'>(</span> <a name="line-53"></a> <span class='hs-conid'>PrimitiveMode</span><span class='hs-layout'>,</span> <span class='hs-conid'>EdgeFlag</span><span class='hs-layout'>(</span><span class='hs-conid'>BeginsInteriorEdge</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span> <a name="line-54"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>OpenGL</span><span class='hs-varop'>.</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>VertexSpec</span> <span class='hs-layout'>(</span> <a name="line-55"></a> <span class='hs-conid'>Vertex3</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Normal3</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span> <a name="line-56"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>OpenGL</span><span class='hs-varop'>.</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>QueryUtils</span> <span class='hs-layout'>(</span> <span class='hs-varid'>maybeNullPtr</span> <span class='hs-layout'>)</span> <a name="line-57"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>OpenGL</span><span class='hs-varop'>.</span><span class='hs-conid'>GLU</span><span class='hs-varop'>.</span><span class='hs-conid'>ErrorsInternal</span> <span class='hs-layout'>(</span> <a name="line-58"></a> <span class='hs-varid'>recordErrorCode</span><span class='hs-layout'>,</span> <span class='hs-varid'>recordOutOfMemory</span> <span class='hs-layout'>)</span> <a name="line-59"></a> <a name="line-60"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-61"></a> <a name="line-62"></a><a name="TessCallback"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>TessCallback</span> <span class='hs-keyglyph'>=</span> <a name="line-63"></a> <span class='hs-conid'>TessBegin</span> <a name="line-64"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Begin</span> <a name="line-65"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessVertex</span> <a name="line-66"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Vertex</span> <a name="line-67"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessEnd</span> <a name="line-68"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>End</span> <a name="line-69"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessError</span> <a name="line-70"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Error'</span> <a name="line-71"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessEdgeFlag</span> <a name="line-72"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>EdgeFlag</span> <a name="line-73"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessCombine</span> <a name="line-74"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessBeginData</span> <a name="line-75"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessVertexData</span> <a name="line-76"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessEndData</span> <a name="line-77"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessErrorData</span> <a name="line-78"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessEdgeFlagData</span> <a name="line-79"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessCombineData</span> <a name="line-80"></a> <a name="line-81"></a><a name="marshalTessCallback"></a><span class='hs-definition'>marshalTessCallback</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessCallback</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</span> <a name="line-82"></a><span class='hs-definition'>marshalTessCallback</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span> <a name="line-83"></a> <span class='hs-conid'>TessBegin</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18704</span> <a name="line-84"></a> <span class='hs-conid'>Begin</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18704</span> <a name="line-85"></a> <span class='hs-conid'>TessVertex</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18705</span> <a name="line-86"></a> <span class='hs-conid'>Vertex</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18705</span> <a name="line-87"></a> <span class='hs-conid'>TessEnd</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18706</span> <a name="line-88"></a> <span class='hs-conid'>End</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18706</span> <a name="line-89"></a> <span class='hs-conid'>TessError</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18707</span> <a name="line-90"></a> <span class='hs-conid'>Error'</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18707</span> <a name="line-91"></a> <span class='hs-conid'>TessEdgeFlag</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18708</span> <a name="line-92"></a> <span class='hs-conid'>EdgeFlag</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18708</span> <a name="line-93"></a> <span class='hs-conid'>TessCombine</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18709</span> <a name="line-94"></a> <span class='hs-conid'>TessBeginData</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x1870a</span> <a name="line-95"></a> <span class='hs-conid'>TessVertexData</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x1870b</span> <a name="line-96"></a> <span class='hs-conid'>TessEndData</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x1870c</span> <a name="line-97"></a> <span class='hs-conid'>TessErrorData</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x1870d</span> <a name="line-98"></a> <span class='hs-conid'>TessEdgeFlagData</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x1870e</span> <a name="line-99"></a> <span class='hs-conid'>TessCombineData</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x1870f</span> <a name="line-100"></a> <a name="line-101"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-102"></a> <a name="line-103"></a><a name="TessProperty"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>TessProperty</span> <span class='hs-keyglyph'>=</span> <a name="line-104"></a> <span class='hs-conid'>TessWindingRule</span> <a name="line-105"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessBoundaryOnly</span> <a name="line-106"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessTolerance</span> <a name="line-107"></a> <a name="line-108"></a><a name="marshalTessProperty"></a><span class='hs-definition'>marshalTessProperty</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessProperty</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</span> <a name="line-109"></a><span class='hs-definition'>marshalTessProperty</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span> <a name="line-110"></a> <span class='hs-conid'>TessWindingRule</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x1872c</span> <a name="line-111"></a> <span class='hs-conid'>TessBoundaryOnly</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x1872d</span> <a name="line-112"></a> <span class='hs-conid'>TessTolerance</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x1872e</span> <a name="line-113"></a> <a name="line-114"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-115"></a> <a name="line-116"></a><a name="TessWinding"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>TessWinding</span> <span class='hs-keyglyph'>=</span> <a name="line-117"></a> <span class='hs-conid'>TessWindingOdd</span> <a name="line-118"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessWindingNonzero</span> <a name="line-119"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessWindingPositive</span> <a name="line-120"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessWindingNegative</span> <a name="line-121"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TessWindingAbsGeqTwo</span> <a name="line-122"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-layout'>)</span> <a name="line-123"></a> <a name="line-124"></a><a name="marshalTessWinding"></a><span class='hs-definition'>marshalTessWinding</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessWinding</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</span> <a name="line-125"></a><span class='hs-definition'>marshalTessWinding</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span> <a name="line-126"></a> <span class='hs-conid'>TessWindingOdd</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18722</span> <a name="line-127"></a> <span class='hs-conid'>TessWindingNonzero</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18723</span> <a name="line-128"></a> <span class='hs-conid'>TessWindingPositive</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18724</span> <a name="line-129"></a> <span class='hs-conid'>TessWindingNegative</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18725</span> <a name="line-130"></a> <span class='hs-conid'>TessWindingAbsGeqTwo</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x18726</span> <a name="line-131"></a> <a name="line-132"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-133"></a> <a name="line-134"></a><span class='hs-comment'>-- | The basic building block in tessellation is a 3D vertex with an associated</span> <a name="line-135"></a><span class='hs-comment'>-- property, e.g. color, texture coordinates, etc.</span> <a name="line-136"></a> <a name="line-137"></a><a name="AnnotatedVertex"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>AnnotatedVertex</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex3</span> <span class='hs-conid'>GLdouble</span><span class='hs-layout'>)</span> <span class='hs-varid'>v</span> <a name="line-138"></a><span class='hs-cpp'>#ifdef __HADDOCK__</span> <a name="line-139"></a><span class='hs-comment'>-- Help Haddock a bit, because it doesn't do any instance inference.</span> <a name="line-140"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-141"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-142"></a><span class='hs-cpp'>#else</span> <a name="line-143"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>)</span> <a name="line-144"></a><span class='hs-cpp'>#endif</span> <a name="line-145"></a> <a name="line-146"></a><a name="offsetOfProperty"></a><span class='hs-definition'>offsetOfProperty</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <a name="line-147"></a><span class='hs-definition'>offsetOfProperty</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>alignOffset</span> <span class='hs-varid'>v</span> <span class='hs-layout'>(</span><span class='hs-num'>3</span> <span class='hs-varop'>*</span> <span class='hs-varid'>sizeOf</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <a name="line-148"></a> <span class='hs-keyword'>where</span> <span class='hs-conid'>AnnotatedVertex</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex3</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span> <a name="line-149"></a> <a name="line-150"></a><a name="alignOffset"></a><span class='hs-definition'>alignOffset</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Storable</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <a name="line-151"></a><span class='hs-definition'>alignOffset</span> <span class='hs-varid'>x</span> <span class='hs-varid'>offset</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-varop'>`mod`</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <a name="line-152"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>alignment</span> <span class='hs-varid'>x</span> <a name="line-153"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varop'>+</span> <span class='hs-varid'>offset</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span> <a name="line-154"></a> <a name="line-155"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Storable</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <a name="line-156"></a> <a name="line-157"></a> <span class='hs-varid'>sizeOf</span> <span class='hs-keyglyph'>~</span><span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex3</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <a name="line-158"></a> <span class='hs-varid'>alignOffset</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>sizeOf</span> <span class='hs-varid'>v</span> <span class='hs-varop'>+</span> <span class='hs-varid'>offsetOfProperty</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-159"></a> <a name="line-160"></a> <span class='hs-varid'>alignment</span> <span class='hs-keyglyph'>~</span><span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex3</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <a name="line-161"></a> <span class='hs-varid'>alignment</span> <span class='hs-varid'>x</span> <a name="line-162"></a> <a name="line-163"></a> <span class='hs-varid'>peek</span> <span class='hs-varid'>ptr</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-164"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>peekElemOff</span> <span class='hs-layout'>(</span><span class='hs-varid'>castPtr</span> <span class='hs-varid'>ptr</span><span class='hs-layout'>)</span> <span class='hs-num'>0</span> <a name="line-165"></a> <span class='hs-varid'>y</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>peekElemOff</span> <span class='hs-layout'>(</span><span class='hs-varid'>castPtr</span> <span class='hs-varid'>ptr</span><span class='hs-layout'>)</span> <span class='hs-num'>1</span> <a name="line-166"></a> <span class='hs-varid'>z</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>peekElemOff</span> <span class='hs-layout'>(</span><span class='hs-varid'>castPtr</span> <span class='hs-varid'>ptr</span><span class='hs-layout'>)</span> <span class='hs-num'>2</span> <a name="line-167"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>dummyElement</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>v</span> <a name="line-168"></a> <span class='hs-varid'>dummyElement</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>undefined</span> <a name="line-169"></a> <span class='hs-varid'>v</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>peekByteOff</span> <span class='hs-layout'>(</span><span class='hs-varid'>castPtr</span> <span class='hs-varid'>ptr</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>offsetOfProperty</span> <span class='hs-layout'>(</span><span class='hs-varid'>dummyElement</span> <span class='hs-varid'>ptr</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-170"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>AnnotatedVertex</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex3</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-varid'>v</span> <a name="line-171"></a> <a name="line-172"></a> <span class='hs-varid'>poke</span> <span class='hs-varid'>ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex3</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-173"></a> <span class='hs-varid'>pokeElemOff</span> <span class='hs-layout'>(</span><span class='hs-varid'>castPtr</span> <span class='hs-varid'>ptr</span><span class='hs-layout'>)</span> <span class='hs-num'>0</span> <span class='hs-varid'>x</span> <a name="line-174"></a> <span class='hs-varid'>pokeElemOff</span> <span class='hs-layout'>(</span><span class='hs-varid'>castPtr</span> <span class='hs-varid'>ptr</span><span class='hs-layout'>)</span> <span class='hs-num'>1</span> <span class='hs-varid'>y</span> <a name="line-175"></a> <span class='hs-varid'>pokeElemOff</span> <span class='hs-layout'>(</span><span class='hs-varid'>castPtr</span> <span class='hs-varid'>ptr</span><span class='hs-layout'>)</span> <span class='hs-num'>2</span> <span class='hs-varid'>z</span> <a name="line-176"></a> <span class='hs-varid'>pokeByteOff</span> <span class='hs-layout'>(</span><span class='hs-varid'>castPtr</span> <span class='hs-varid'>ptr</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>offsetOfProperty</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-varid'>v</span> <a name="line-177"></a> <a name="line-178"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-179"></a> <a name="line-180"></a><span class='hs-comment'>-- | A complex contour, which can be self-intersecting and\/or concave.</span> <a name="line-181"></a> <a name="line-182"></a><a name="ComplexContour"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>ComplexContour</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ComplexContour</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span><span class='hs-keyglyph'>]</span> <a name="line-183"></a><span class='hs-cpp'>#ifdef __HADDOCK__</span> <a name="line-184"></a><span class='hs-comment'>-- Help Haddock a bit, because it doesn't do any instance inference.</span> <a name="line-185"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComplexContour</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-186"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComplexContour</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-187"></a><span class='hs-cpp'>#else</span> <a name="line-188"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>)</span> <a name="line-189"></a><span class='hs-cpp'>#endif</span> <a name="line-190"></a> <a name="line-191"></a><a name="sizeOfComplexContour"></a><span class='hs-definition'>sizeOfComplexContour</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ComplexContour</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <a name="line-192"></a><span class='hs-definition'>sizeOfComplexContour</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComplexContour</span> <span class='hs-varid'>vs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <a name="line-193"></a> <span class='hs-varid'>length</span> <span class='hs-varid'>vs</span> <span class='hs-varop'>*</span> <span class='hs-varid'>sizeOf</span> <span class='hs-layout'>(</span><span class='hs-varid'>head</span> <span class='hs-varid'>vs</span><span class='hs-layout'>)</span> <a name="line-194"></a> <a name="line-195"></a><a name="pokeComplexContour"></a><span class='hs-definition'>pokeComplexContour</span> <span class='hs-keyglyph'>::</span> <a name="line-196"></a> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComplexContour</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ComplexContour</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-197"></a><span class='hs-definition'>pokeComplexContour</span> <span class='hs-varid'>ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComplexContour</span> <span class='hs-varid'>vs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <a name="line-198"></a> <span class='hs-varid'>pokeArray</span> <span class='hs-layout'>(</span><span class='hs-varid'>castPtr</span> <span class='hs-varid'>ptr</span><span class='hs-layout'>)</span> <span class='hs-varid'>vs</span> <a name="line-199"></a> <a name="line-200"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-201"></a> <a name="line-202"></a><span class='hs-comment'>-- | A complex (possibly concave) polygon, represented by one or more complex</span> <a name="line-203"></a><span class='hs-comment'>-- and possibly intersecting contours.</span> <a name="line-204"></a> <a name="line-205"></a><a name="ComplexPolygon"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>ComplexPolygon</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ComplexPolygon</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>ComplexContour</span> <span class='hs-varid'>v</span><span class='hs-keyglyph'>]</span> <a name="line-206"></a><span class='hs-cpp'>#ifdef __HADDOCK__</span> <a name="line-207"></a><span class='hs-comment'>-- Help Haddock a bit, because it doesn't do any instance inference.</span> <a name="line-208"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComplexPolygon</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-209"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComplexPolygon</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-210"></a><span class='hs-cpp'>#else</span> <a name="line-211"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>)</span> <a name="line-212"></a><span class='hs-cpp'>#endif</span> <a name="line-213"></a> <a name="line-214"></a><a name="sizeOfComplexPolygon"></a><span class='hs-definition'>sizeOfComplexPolygon</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ComplexPolygon</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <a name="line-215"></a><span class='hs-definition'>sizeOfComplexPolygon</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComplexPolygon</span> <span class='hs-varid'>complexContours</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <a name="line-216"></a> <span class='hs-varid'>sum</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>sizeOfComplexContour</span> <span class='hs-varid'>complexContours</span><span class='hs-layout'>)</span> <a name="line-217"></a> <a name="line-218"></a><a name="pokeComplexPolygon"></a><span class='hs-definition'>pokeComplexPolygon</span> <span class='hs-keyglyph'>::</span> <a name="line-219"></a> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComplexPolygon</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ComplexPolygon</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-220"></a><span class='hs-definition'>pokeComplexPolygon</span> <span class='hs-varid'>ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComplexPolygon</span> <span class='hs-varid'>complexContours</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <a name="line-221"></a> <span class='hs-varid'>foldM</span> <span class='hs-varid'>pokeAndAdvance</span> <span class='hs-layout'>(</span><span class='hs-varid'>castPtr</span> <span class='hs-varid'>ptr</span><span class='hs-layout'>)</span> <span class='hs-varid'>complexContours</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span> <a name="line-222"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>pokeAndAdvance</span> <span class='hs-varid'>p</span> <span class='hs-varid'>complexContour</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-223"></a> <span class='hs-varid'>pokeComplexContour</span> <span class='hs-varid'>p</span> <span class='hs-varid'>complexContour</span> <a name="line-224"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>p</span> <span class='hs-varop'>`plusPtr`</span> <span class='hs-varid'>sizeOfComplexContour</span> <span class='hs-varid'>complexContour</span> <a name="line-225"></a> <a name="line-226"></a><a name="withComplexPolygon"></a><span class='hs-definition'>withComplexPolygon</span> <span class='hs-keyglyph'>::</span> <a name="line-227"></a> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ComplexPolygon</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComplexPolygon</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <a name="line-228"></a><span class='hs-definition'>withComplexPolygon</span> <span class='hs-varid'>complexPolygon</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <a name="line-229"></a> <span class='hs-varid'>allocaBytes</span> <span class='hs-layout'>(</span><span class='hs-varid'>sizeOfComplexPolygon</span> <span class='hs-varid'>complexPolygon</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>ptr</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-230"></a> <span class='hs-varid'>pokeComplexPolygon</span> <span class='hs-varid'>ptr</span> <span class='hs-varid'>complexPolygon</span> <a name="line-231"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>ptr</span> <a name="line-232"></a> <a name="line-233"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-234"></a> <a name="line-235"></a><span class='hs-comment'>-- | Four vertex properties (cf. 'AnnotatedVertex') with associated weigths</span> <a name="line-236"></a><span class='hs-comment'>-- summing up to 1.0.</span> <a name="line-237"></a> <a name="line-238"></a><a name="WeightedProperties"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>WeightedProperties</span> <span class='hs-varid'>v</span> <a name="line-239"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>WeightedProperties</span> <span class='hs-layout'>(</span><span class='hs-conid'>GLclampf</span><span class='hs-layout'>,</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-240"></a> <span class='hs-layout'>(</span><span class='hs-conid'>GLclampf</span><span class='hs-layout'>,</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-241"></a> <span class='hs-layout'>(</span><span class='hs-conid'>GLclampf</span><span class='hs-layout'>,</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-242"></a> <span class='hs-layout'>(</span><span class='hs-conid'>GLclampf</span><span class='hs-layout'>,</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-243"></a><span class='hs-cpp'>#ifdef __HADDOCK__</span> <a name="line-244"></a><span class='hs-comment'>-- Help Haddock a bit, because it doesn't do any instance inference.</span> <a name="line-245"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span><span class='hs-conid'>WeightedProperties</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-246"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>(</span><span class='hs-conid'>WeightedProperties</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-247"></a><span class='hs-cpp'>#else</span> <a name="line-248"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>)</span> <a name="line-249"></a><span class='hs-cpp'>#endif</span> <a name="line-250"></a> <a name="line-251"></a><span class='hs-comment'>-- | A function combining given vertex properties into a property for a newly</span> <a name="line-252"></a><span class='hs-comment'>-- generated vertex</span> <a name="line-253"></a> <a name="line-254"></a><a name="Combiner"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Combiner</span> <span class='hs-varid'>v</span> <a name="line-255"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Vertex3</span> <span class='hs-conid'>GLdouble</span> <a name="line-256"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>WeightedProperties</span> <span class='hs-varid'>v</span> <a name="line-257"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>v</span> <a name="line-258"></a> <a name="line-259"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-260"></a> <a name="line-261"></a><span class='hs-comment'>-- | The relative tolerance under which two vertices can be combined (see</span> <a name="line-262"></a><span class='hs-comment'>-- 'Combiner'). Multiplication with the largest coordinate magnitude of all</span> <a name="line-263"></a><span class='hs-comment'>-- polygon vertices yields the maximum distance between two mergeable vertices.</span> <a name="line-264"></a><span class='hs-comment'>--</span> <a name="line-265"></a><span class='hs-comment'>-- Note that merging is optional and the tolerance is only a hint.</span> <a name="line-266"></a> <a name="line-267"></a><a name="Tolerance"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Tolerance</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GLdouble</span> <a name="line-268"></a> <a name="line-269"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-270"></a> <a name="line-271"></a><span class='hs-comment'>-- | A general tessellator type.</span> <a name="line-272"></a><span class='hs-comment'>--</span> <a name="line-273"></a><span class='hs-comment'>-- Before tessellation of a complex polygon, all its vertices are projected into</span> <a name="line-274"></a><span class='hs-comment'>-- a plane perpendicular to the given normal. If the given normal is</span> <a name="line-275"></a><span class='hs-comment'>-- @Normal3 0 0 0@, a fitting plane of all vertices is used.</span> <a name="line-276"></a> <a name="line-277"></a><a name="Tessellator"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Tessellator</span> <span class='hs-varid'>p</span> <span class='hs-varid'>v</span> <a name="line-278"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TessWinding</span> <a name="line-279"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Tolerance</span> <a name="line-280"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Normal3</span> <span class='hs-conid'>GLdouble</span> <a name="line-281"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Combiner</span> <span class='hs-varid'>v</span> <a name="line-282"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ComplexPolygon</span> <span class='hs-varid'>v</span> <a name="line-283"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-284"></a> <a name="line-285"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-286"></a> <a name="line-287"></a><span class='hs-comment'>-- | A simple, non-self-intersecting contour</span> <a name="line-288"></a> <a name="line-289"></a><a name="SimpleContour"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>SimpleContour</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SimpleContour</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span><span class='hs-keyglyph'>]</span> <a name="line-290"></a><span class='hs-cpp'>#ifdef __HADDOCK__</span> <a name="line-291"></a><span class='hs-comment'>-- Help Haddock a bit, because it doesn't do any instance inference.</span> <a name="line-292"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span><span class='hs-conid'>SimpleContour</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-293"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>(</span><span class='hs-conid'>SimpleContour</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-294"></a><span class='hs-cpp'>#else</span> <a name="line-295"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>)</span> <a name="line-296"></a><span class='hs-cpp'>#endif</span> <a name="line-297"></a> <a name="line-298"></a><span class='hs-comment'>-- | The contours of a complex polygon, represented by one or more</span> <a name="line-299"></a><span class='hs-comment'>-- non-intersecting simple contours</span> <a name="line-300"></a> <a name="line-301"></a><a name="PolygonContours"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>PolygonContours</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PolygonContours</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>SimpleContour</span> <span class='hs-varid'>v</span><span class='hs-keyglyph'>]</span> <a name="line-302"></a><span class='hs-cpp'>#ifdef __HADDOCK__</span> <a name="line-303"></a><span class='hs-comment'>-- Help Haddock a bit, because it doesn't do any instance inference.</span> <a name="line-304"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span><span class='hs-conid'>PolygonContours</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-305"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>(</span><span class='hs-conid'>PolygonContours</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-306"></a><span class='hs-cpp'>#else</span> <a name="line-307"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>)</span> <a name="line-308"></a><span class='hs-cpp'>#endif</span> <a name="line-309"></a> <a name="line-310"></a><a name="extractContours"></a><span class='hs-definition'>extractContours</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Tessellator</span> <span class='hs-conid'>PolygonContours</span> <span class='hs-varid'>v</span> <a name="line-311"></a><span class='hs-definition'>extractContours</span> <span class='hs-varid'>windingRule</span> <span class='hs-varid'>tolerance</span> <span class='hs-varid'>normal</span> <span class='hs-varid'>combiner</span> <span class='hs-varid'>complexPoly</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-312"></a> <a name="line-313"></a> <span class='hs-varid'>vertices</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-conid'>[]</span> <a name="line-314"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>addVertex</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>modifyIORef</span> <span class='hs-varid'>vertices</span> <span class='hs-layout'>(</span><span class='hs-varid'>v</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span> <a name="line-315"></a> <a name="line-316"></a> <span class='hs-varid'>contours</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-conid'>[]</span> <a name="line-317"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>finishContour</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-318"></a> <span class='hs-varid'>vs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>vertices</span> <a name="line-319"></a> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>vertices</span> <span class='hs-conid'>[]</span> <a name="line-320"></a> <span class='hs-varid'>modifyIORef</span> <span class='hs-varid'>contours</span> <span class='hs-layout'>(</span><span class='hs-conid'>SimpleContour</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>vs</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span><span class='hs-layout'>)</span> <a name="line-321"></a> <a name="line-322"></a> <span class='hs-varid'>getContours</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-conid'>PolygonContours</span> <span class='hs-varop'>.</span> <span class='hs-varid'>reverse</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>readIORef</span> <span class='hs-varid'>contours</span><span class='hs-layout'>)</span> <a name="line-323"></a> <a name="line-324"></a> <span class='hs-varid'>withTessellatorObj</span> <span class='hs-layout'>(</span><span class='hs-conid'>PolygonContours</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span><span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>tessObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-325"></a> <span class='hs-varid'>setTessellatorProperties</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>windingRule</span> <span class='hs-varid'>tolerance</span> <span class='hs-varid'>normal</span> <span class='hs-conid'>True</span> <a name="line-326"></a> <span class='hs-varid'>withVertexCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>addVertex</span> <span class='hs-varop'>$</span> <a name="line-327"></a> <span class='hs-varid'>withEndCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>finishContour</span> <span class='hs-varop'>$</span> <a name="line-328"></a> <span class='hs-varid'>checkForError</span> <span class='hs-varid'>tessObj</span> <span class='hs-varop'>$</span> <a name="line-329"></a> <span class='hs-varid'>withCombineCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>combiner</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <a name="line-330"></a> <span class='hs-varid'>defineComplexPolygon</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>complexPoly</span> <a name="line-331"></a> <span class='hs-varid'>getContours</span> <a name="line-332"></a> <a name="line-333"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-334"></a> <a name="line-335"></a><span class='hs-comment'>-- | A triangle vertex with additional information about the edge it begins</span> <a name="line-336"></a> <a name="line-337"></a><a name="TriangleVertex"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>TriangleVertex</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>AnnotatedVertex</span> <span class='hs-layout'>(</span><span class='hs-varid'>v</span><span class='hs-layout'>,</span><span class='hs-conid'>EdgeFlag</span><span class='hs-layout'>)</span> <a name="line-338"></a> <a name="line-339"></a><span class='hs-comment'>-- | A triangle, represented by three triangle vertices</span> <a name="line-340"></a> <a name="line-341"></a><a name="Triangle"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Triangle</span> <span class='hs-varid'>v</span> <a name="line-342"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Triangle</span> <span class='hs-layout'>(</span><span class='hs-conid'>TriangleVertex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>TriangleVertex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>TriangleVertex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-343"></a><span class='hs-cpp'>#ifdef __HADDOCK__</span> <a name="line-344"></a><span class='hs-comment'>-- Help Haddock a bit, because it doesn't do any instance inference.</span> <a name="line-345"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span><span class='hs-conid'>Triangle</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-346"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>(</span><span class='hs-conid'>Triangle</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-347"></a><span class='hs-cpp'>#else</span> <a name="line-348"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>)</span> <a name="line-349"></a><span class='hs-cpp'>#endif</span> <a name="line-350"></a> <a name="line-351"></a><span class='hs-comment'>-- | A triangulation of a complex polygon</span> <a name="line-352"></a> <a name="line-353"></a><a name="Triangulation"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>Triangulation</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Triangulation</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Triangle</span> <span class='hs-varid'>v</span><span class='hs-keyglyph'>]</span> <a name="line-354"></a><span class='hs-cpp'>#ifdef __HADDOCK__</span> <a name="line-355"></a><span class='hs-comment'>-- Help Haddock a bit, because it doesn't do any instance inference.</span> <a name="line-356"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span><span class='hs-conid'>Triangulation</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-357"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>(</span><span class='hs-conid'>Triangulation</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-358"></a><span class='hs-cpp'>#else</span> <a name="line-359"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>)</span> <a name="line-360"></a><span class='hs-cpp'>#endif</span> <a name="line-361"></a> <a name="line-362"></a><a name="triangulate"></a><span class='hs-definition'>triangulate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Tessellator</span> <span class='hs-conid'>Triangulation</span> <span class='hs-varid'>v</span> <a name="line-363"></a><span class='hs-definition'>triangulate</span> <span class='hs-varid'>windingRule</span> <span class='hs-varid'>tolerance</span> <span class='hs-varid'>normal</span> <span class='hs-varid'>combiner</span> <span class='hs-varid'>complexPoly</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-364"></a> <a name="line-365"></a> <span class='hs-varid'>edgeFlagState</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-conid'>BeginsInteriorEdge</span> <a name="line-366"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>registerEdgeFlag</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>edgeFlagState</span> <a name="line-367"></a> <a name="line-368"></a> <span class='hs-varid'>vertices</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-conid'>[]</span> <a name="line-369"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>addVertex</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>xyz</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-370"></a> <span class='hs-varid'>ef</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>edgeFlagState</span> <a name="line-371"></a> <span class='hs-varid'>modifyIORef</span> <span class='hs-varid'>vertices</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>xyz</span> <span class='hs-layout'>(</span><span class='hs-varid'>v</span><span class='hs-layout'>,</span><span class='hs-varid'>ef</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span><span class='hs-layout'>)</span> <a name="line-372"></a> <a name="line-373"></a> <span class='hs-varid'>getTriangulation</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-374"></a> <span class='hs-varid'>vs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>vertices</span> <a name="line-375"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Triangulation</span> <span class='hs-layout'>(</span><span class='hs-varid'>collectTriangles</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>vs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-376"></a> <a name="line-377"></a> <span class='hs-varid'>withTessellatorObj</span> <span class='hs-layout'>(</span><span class='hs-conid'>Triangulation</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>tessObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-378"></a> <span class='hs-varid'>setTessellatorProperties</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>windingRule</span> <span class='hs-varid'>tolerance</span> <span class='hs-varid'>normal</span> <span class='hs-conid'>False</span> <a name="line-379"></a> <span class='hs-varid'>withEdgeFlagCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>registerEdgeFlag</span> <span class='hs-varop'>$</span> <a name="line-380"></a> <span class='hs-varid'>withVertexCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>addVertex</span> <span class='hs-varop'>$</span> <a name="line-381"></a> <span class='hs-varid'>checkForError</span> <span class='hs-varid'>tessObj</span> <span class='hs-varop'>$</span> <a name="line-382"></a> <span class='hs-varid'>withCombineCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>combiner</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <a name="line-383"></a> <span class='hs-varid'>defineComplexPolygon</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>complexPoly</span> <a name="line-384"></a> <span class='hs-varid'>getTriangulation</span> <a name="line-385"></a> <a name="line-386"></a><a name="collectTriangles"></a><span class='hs-definition'>collectTriangles</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>TriangleVertex</span> <span class='hs-varid'>v</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Triangle</span> <span class='hs-varid'>v</span><span class='hs-keyglyph'>]</span> <a name="line-387"></a><span class='hs-definition'>collectTriangles</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span> <a name="line-388"></a><span class='hs-definition'>collectTriangles</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-conop'>:</span><span class='hs-varid'>b</span><span class='hs-conop'>:</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Triangle</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span> <span class='hs-conop'>:</span> <span class='hs-varid'>collectTriangles</span> <span class='hs-varid'>rest</span> <a name="line-389"></a><span class='hs-definition'>collectTriangles</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"triangles left"</span> <a name="line-390"></a> <a name="line-391"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-392"></a> <a name="line-393"></a><a name="Primitive"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Primitive</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Primitive</span> <span class='hs-conid'>PrimitiveMode</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span><span class='hs-keyglyph'>]</span> <a name="line-394"></a><span class='hs-cpp'>#ifdef __HADDOCK__</span> <a name="line-395"></a><span class='hs-comment'>-- Help Haddock a bit, because it doesn't do any instance inference.</span> <a name="line-396"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span><span class='hs-conid'>Primitive</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-397"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>(</span><span class='hs-conid'>Primitive</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-398"></a><span class='hs-cpp'>#else</span> <a name="line-399"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>)</span> <a name="line-400"></a><span class='hs-cpp'>#endif</span> <a name="line-401"></a> <a name="line-402"></a><a name="SimplePolygon"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>SimplePolygon</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SimplePolygon</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Primitive</span> <span class='hs-varid'>v</span><span class='hs-keyglyph'>]</span> <a name="line-403"></a><span class='hs-cpp'>#ifdef __HADDOCK__</span> <a name="line-404"></a><span class='hs-comment'>-- Help Haddock a bit, because it doesn't do any instance inference.</span> <a name="line-405"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span><span class='hs-conid'>SimplePolygon</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-406"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>(</span><span class='hs-conid'>SimplePolygon</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-407"></a><span class='hs-cpp'>#else</span> <a name="line-408"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>)</span> <a name="line-409"></a><span class='hs-cpp'>#endif</span> <a name="line-410"></a> <a name="line-411"></a><a name="tessellate"></a><span class='hs-definition'>tessellate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Tessellator</span> <span class='hs-conid'>SimplePolygon</span> <span class='hs-varid'>v</span> <a name="line-412"></a><span class='hs-definition'>tessellate</span> <span class='hs-varid'>windingRule</span> <span class='hs-varid'>tolerance</span> <span class='hs-varid'>normal</span> <span class='hs-varid'>combiner</span> <span class='hs-varid'>complexPoly</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-413"></a> <a name="line-414"></a> <span class='hs-varid'>beginModeState</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-varid'>undefined</span> <a name="line-415"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>setPrimitiveMode</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>beginModeState</span> <a name="line-416"></a> <a name="line-417"></a> <span class='hs-varid'>vertices</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-conid'>[]</span> <a name="line-418"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>addVertex</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>modifyIORef</span> <span class='hs-varid'>vertices</span> <span class='hs-layout'>(</span><span class='hs-varid'>v</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span> <a name="line-419"></a> <a name="line-420"></a> <span class='hs-varid'>primitives</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-conid'>[]</span> <a name="line-421"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>finishPrimitive</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-422"></a> <span class='hs-varid'>beginMode</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>beginModeState</span> <a name="line-423"></a> <span class='hs-varid'>vs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>vertices</span> <a name="line-424"></a> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>vertices</span> <span class='hs-conid'>[]</span> <a name="line-425"></a> <span class='hs-varid'>modifyIORef</span> <span class='hs-varid'>primitives</span> <span class='hs-layout'>(</span><span class='hs-conid'>Primitive</span> <span class='hs-varid'>beginMode</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>vs</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span><span class='hs-layout'>)</span> <a name="line-426"></a> <a name="line-427"></a> <span class='hs-varid'>getSimplePolygon</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-conid'>SimplePolygon</span> <span class='hs-varop'>.</span> <span class='hs-varid'>reverse</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>readIORef</span> <span class='hs-varid'>primitives</span><span class='hs-layout'>)</span> <a name="line-428"></a> <a name="line-429"></a> <span class='hs-varid'>withTessellatorObj</span> <span class='hs-layout'>(</span><span class='hs-conid'>SimplePolygon</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>tessObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-430"></a> <span class='hs-varid'>setTessellatorProperties</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>windingRule</span> <span class='hs-varid'>tolerance</span> <span class='hs-varid'>normal</span> <span class='hs-conid'>False</span> <a name="line-431"></a> <span class='hs-varid'>withBeginCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>setPrimitiveMode</span> <span class='hs-varop'>$</span> <a name="line-432"></a> <span class='hs-varid'>withVertexCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>addVertex</span> <span class='hs-varop'>$</span> <a name="line-433"></a> <span class='hs-varid'>withEndCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>finishPrimitive</span> <span class='hs-varop'>$</span> <a name="line-434"></a> <span class='hs-varid'>checkForError</span> <span class='hs-varid'>tessObj</span> <span class='hs-varop'>$</span> <a name="line-435"></a> <span class='hs-varid'>withCombineCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>combiner</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <a name="line-436"></a> <span class='hs-varid'>defineComplexPolygon</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>complexPoly</span> <a name="line-437"></a> <span class='hs-varid'>getSimplePolygon</span> <a name="line-438"></a> <a name="line-439"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-440"></a><span class='hs-comment'>-- chapter 5.1: The Tessellation Object</span> <a name="line-441"></a> <a name="line-442"></a><a name="TessellatorObj"></a><span class='hs-comment'>-- an opaque pointer to a tessellator object</span> <a name="line-443"></a><a name="TessellatorObj"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-conid'>TessellatorObj</span><span class='hs-layout'>)</span> <a name="line-444"></a> <a name="line-445"></a><a name="isNullTesselatorObj"></a><span class='hs-definition'>isNullTesselatorObj</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <a name="line-446"></a><span class='hs-definition'>isNullTesselatorObj</span> <span class='hs-layout'>(</span><span class='hs-conid'>TessellatorObj</span> <span class='hs-varid'>ptr</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ptr</span> <span class='hs-varop'>==</span> <span class='hs-varid'>nullPtr</span> <a name="line-447"></a> <a name="line-448"></a><a name="withTessellatorObj"></a><span class='hs-definition'>withTessellatorObj</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <a name="line-449"></a><span class='hs-definition'>withTessellatorObj</span> <span class='hs-varid'>failureValue</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <a name="line-450"></a> <span class='hs-varid'>bracket</span> <span class='hs-varid'>gluNewTess</span> <span class='hs-varid'>safeDeleteTess</span> <a name="line-451"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>tessObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>if</span> <span class='hs-varid'>isNullTesselatorObj</span> <span class='hs-varid'>tessObj</span> <a name="line-452"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>recordOutOfMemory</span> <a name="line-453"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>failureValue</span> <a name="line-454"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>action</span> <span class='hs-varid'>tessObj</span><span class='hs-layout'>)</span> <a name="line-455"></a> <a name="line-456"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"gluNewTess"</span> <span class='hs-varid'>gluNewTess</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>TessellatorObj</span> <a name="line-457"></a> <a name="line-458"></a><a name="safeDeleteTess"></a><span class='hs-definition'>safeDeleteTess</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-459"></a><span class='hs-definition'>safeDeleteTess</span> <span class='hs-varid'>tessObj</span> <span class='hs-keyglyph'>=</span> <a name="line-460"></a> <span class='hs-varid'>unless</span> <span class='hs-layout'>(</span><span class='hs-varid'>isNullTesselatorObj</span> <span class='hs-varid'>tessObj</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>gluDeleteTess</span> <span class='hs-varid'>tessObj</span> <a name="line-461"></a> <a name="line-462"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"gluDeleteTess"</span> <span class='hs-varid'>gluDeleteTess</span> <span class='hs-keyglyph'>::</span> <a name="line-463"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-464"></a> <a name="line-465"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-466"></a><span class='hs-comment'>-- chapter 5.2: Polygon Definition (polygons)</span> <a name="line-467"></a> <a name="line-468"></a><a name="defineComplexPolygon"></a><span class='hs-definition'>defineComplexPolygon</span> <span class='hs-keyglyph'>::</span> <a name="line-469"></a> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ComplexPolygon</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-470"></a><span class='hs-definition'>defineComplexPolygon</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>cp</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>ComplexPolygon</span> <span class='hs-varid'>complexContours</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <a name="line-471"></a> <span class='hs-varid'>withComplexPolygon</span> <span class='hs-varid'>cp</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>ptr</span> <span class='hs-keyglyph'>-></span> <a name="line-472"></a> <span class='hs-varid'>tessBeginEndPolygon</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>nullPtr</span> <span class='hs-varop'>$</span> <a name="line-473"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>loop</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span> <a name="line-474"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>defineComplexContour</span> <span class='hs-varid'>tessObj</span> <span class='hs-layout'>(</span><span class='hs-varid'>castPtr</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-varid'>c</span> <a name="line-475"></a> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span> <span class='hs-varop'>`plusPtr`</span> <span class='hs-varid'>sizeOfComplexContour</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span> <a name="line-476"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>ptr</span> <span class='hs-varid'>complexContours</span> <a name="line-477"></a> <a name="line-478"></a><a name="tessBeginEndPolygon"></a><span class='hs-definition'>tessBeginEndPolygon</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <a name="line-479"></a><span class='hs-definition'>tessBeginEndPolygon</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>ptr</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-480"></a> <span class='hs-varid'>gluTessBeginPolygon</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>ptr</span> <a name="line-481"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>f</span> <a name="line-482"></a> <span class='hs-varid'>gluTessEndPolygon</span> <span class='hs-varid'>tessObj</span> <a name="line-483"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>res</span> <a name="line-484"></a> <a name="line-485"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>safe</span> <span class='hs-str'>"gluTessBeginPolygon"</span> <span class='hs-varid'>gluTessBeginPolygon</span> <span class='hs-keyglyph'>::</span> <a name="line-486"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-487"></a> <a name="line-488"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>safe</span> <span class='hs-str'>"gluTessEndPolygon"</span> <span class='hs-varid'>gluTessEndPolygon</span> <span class='hs-keyglyph'>::</span> <a name="line-489"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-490"></a> <a name="line-491"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-492"></a><span class='hs-comment'>-- chapter 5.2: Polygon Definition (contours)</span> <a name="line-493"></a> <a name="line-494"></a><a name="defineComplexContour"></a><span class='hs-definition'>defineComplexContour</span> <span class='hs-keyglyph'>::</span> <a name="line-495"></a> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <a name="line-496"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComplexContour</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ComplexContour</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-497"></a><span class='hs-definition'>defineComplexContour</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>ComplexContour</span> <span class='hs-varid'>annotatedVertices</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <a name="line-498"></a> <span class='hs-varid'>tessBeginEndContour</span> <span class='hs-varid'>tessObj</span> <span class='hs-varop'>$</span> <a name="line-499"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>loop</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span> <a name="line-500"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>v</span><span class='hs-conop'>:</span><span class='hs-varid'>vs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>defineVertex</span> <span class='hs-varid'>tessObj</span> <span class='hs-layout'>(</span><span class='hs-varid'>castPtr</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <a name="line-501"></a> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span> <span class='hs-varop'>`plusPtr`</span> <span class='hs-varid'>sizeOf</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-varid'>vs</span> <a name="line-502"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>ptr</span> <span class='hs-varid'>annotatedVertices</span> <a name="line-503"></a> <a name="line-504"></a><a name="tessBeginEndContour"></a><span class='hs-definition'>tessBeginEndContour</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <a name="line-505"></a><span class='hs-definition'>tessBeginEndContour</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-506"></a> <span class='hs-varid'>gluTessBeginContour</span> <span class='hs-varid'>tessObj</span> <a name="line-507"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>f</span> <a name="line-508"></a> <span class='hs-varid'>gluTessEndContour</span> <span class='hs-varid'>tessObj</span> <a name="line-509"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>res</span> <a name="line-510"></a> <a name="line-511"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>safe</span> <span class='hs-str'>"gluTessBeginContour"</span> <span class='hs-varid'>gluTessBeginContour</span> <span class='hs-keyglyph'>::</span> <a name="line-512"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-513"></a> <a name="line-514"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>safe</span> <span class='hs-str'>"gluTessEndContour"</span> <span class='hs-varid'>gluTessEndContour</span> <span class='hs-keyglyph'>::</span> <a name="line-515"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-516"></a> <a name="line-517"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-518"></a><span class='hs-comment'>-- chapter 5.2: Polygon Definition (vertices)</span> <a name="line-519"></a> <a name="line-520"></a><a name="defineVertex"></a><span class='hs-definition'>defineVertex</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-521"></a><span class='hs-definition'>defineVertex</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>ptr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>gluTessVertex</span> <span class='hs-varid'>tessObj</span> <span class='hs-layout'>(</span><span class='hs-varid'>castPtr</span> <span class='hs-varid'>ptr</span><span class='hs-layout'>)</span> <span class='hs-varid'>ptr</span> <a name="line-522"></a> <a name="line-523"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>safe</span> <span class='hs-str'>"gluTessVertex"</span> <span class='hs-varid'>gluTessVertex</span> <span class='hs-keyglyph'>::</span> <a name="line-524"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex3</span> <span class='hs-conid'>GLdouble</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-525"></a> <a name="line-526"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-527"></a><span class='hs-comment'>-- chapter 5.3: Callbacks (begin)</span> <a name="line-528"></a> <a name="line-529"></a><a name="BeginCallback"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>BeginCallback</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PrimitiveMode</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-530"></a> <a name="line-531"></a><a name="BeginCallback'"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>BeginCallback'</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-532"></a> <a name="line-533"></a><a name="withBeginCallback"></a><span class='hs-definition'>withBeginCallback</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>BeginCallback</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <a name="line-534"></a><span class='hs-definition'>withBeginCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>beginCallback</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <a name="line-535"></a> <span class='hs-varid'>bracket</span> <span class='hs-layout'>(</span><span class='hs-varid'>makeBeginCallback</span> <span class='hs-layout'>(</span><span class='hs-varid'>beginCallback</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unmarshalPrimitiveMode</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-536"></a> <span class='hs-varid'>freeHaskellFunPtr</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>callbackPtr</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-537"></a> <span class='hs-varid'>setBeginCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-layout'>(</span><span class='hs-varid'>marshalTessCallback</span> <span class='hs-conid'>TessBegin</span><span class='hs-layout'>)</span> <span class='hs-varid'>callbackPtr</span> <a name="line-538"></a> <span class='hs-varid'>action</span> <a name="line-539"></a> <a name="line-540"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-str'>"wrapper"</span> <span class='hs-varid'>makeBeginCallback</span> <span class='hs-keyglyph'>::</span> <a name="line-541"></a> <span class='hs-conid'>BeginCallback'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>FunPtr</span> <span class='hs-conid'>BeginCallback'</span><span class='hs-layout'>)</span> <a name="line-542"></a> <a name="line-543"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"gluTessCallback"</span> <span class='hs-varid'>setBeginCallback</span> <span class='hs-keyglyph'>::</span> <a name="line-544"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FunPtr</span> <span class='hs-conid'>BeginCallback'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-545"></a> <a name="line-546"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-547"></a><span class='hs-comment'>-- chapter 5.3: Callbacks (edgeFlag)</span> <a name="line-548"></a> <a name="line-549"></a><a name="EdgeFlagCallback"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>EdgeFlagCallback</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EdgeFlag</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-550"></a> <a name="line-551"></a><a name="EdgeFlagCallback'"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>EdgeFlagCallback'</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GLboolean</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-552"></a> <a name="line-553"></a><a name="withEdgeFlagCallback"></a><span class='hs-definition'>withEdgeFlagCallback</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>EdgeFlagCallback</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <a name="line-554"></a><span class='hs-definition'>withEdgeFlagCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>edgeFlagCallback</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <a name="line-555"></a> <span class='hs-varid'>bracket</span> <span class='hs-layout'>(</span><span class='hs-varid'>makeEdgeFlagCallback</span> <span class='hs-layout'>(</span><span class='hs-varid'>edgeFlagCallback</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unmarshalEdgeFlag</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-556"></a> <span class='hs-varid'>freeHaskellFunPtr</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>callbackPtr</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-557"></a> <span class='hs-varid'>setEdgeFlagCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-layout'>(</span><span class='hs-varid'>marshalTessCallback</span> <span class='hs-conid'>TessEdgeFlag</span><span class='hs-layout'>)</span> <span class='hs-varid'>callbackPtr</span> <a name="line-558"></a> <span class='hs-varid'>action</span> <a name="line-559"></a> <a name="line-560"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-str'>"wrapper"</span> <span class='hs-varid'>makeEdgeFlagCallback</span> <span class='hs-keyglyph'>::</span> <a name="line-561"></a> <span class='hs-conid'>EdgeFlagCallback'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>FunPtr</span> <span class='hs-conid'>EdgeFlagCallback'</span><span class='hs-layout'>)</span> <a name="line-562"></a> <a name="line-563"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"gluTessCallback"</span> <span class='hs-varid'>setEdgeFlagCallback</span> <span class='hs-keyglyph'>::</span> <a name="line-564"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FunPtr</span> <span class='hs-conid'>EdgeFlagCallback'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-565"></a> <a name="line-566"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-567"></a><span class='hs-comment'>-- chapter 5.3: Callbacks (vertex)</span> <a name="line-568"></a> <a name="line-569"></a><a name="VertexCallback"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>VertexCallback</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-570"></a> <a name="line-571"></a><a name="VertexCallback'"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>VertexCallback'</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-572"></a> <a name="line-573"></a><a name="withVertexCallback"></a><span class='hs-definition'>withVertexCallback</span> <span class='hs-keyglyph'>::</span> <a name="line-574"></a> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VertexCallback</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <a name="line-575"></a><span class='hs-definition'>withVertexCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>vertexCallback</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <a name="line-576"></a> <span class='hs-varid'>bracket</span> <span class='hs-layout'>(</span><span class='hs-varid'>makeVertexCallback</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>p</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>peek</span> <span class='hs-varid'>p</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>vertexCallback</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-577"></a> <span class='hs-varid'>freeHaskellFunPtr</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>callbackPtr</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-578"></a> <span class='hs-varid'>setVertexCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-layout'>(</span><span class='hs-varid'>marshalTessCallback</span> <span class='hs-conid'>TessVertex</span><span class='hs-layout'>)</span> <span class='hs-varid'>callbackPtr</span> <a name="line-579"></a> <span class='hs-varid'>action</span> <a name="line-580"></a> <a name="line-581"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-str'>"wrapper"</span> <span class='hs-varid'>makeVertexCallback</span> <span class='hs-keyglyph'>::</span> <a name="line-582"></a> <span class='hs-conid'>VertexCallback'</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>FunPtr</span> <span class='hs-layout'>(</span><span class='hs-conid'>VertexCallback'</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-583"></a> <a name="line-584"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"gluTessCallback"</span> <span class='hs-varid'>setVertexCallback</span> <span class='hs-keyglyph'>::</span> <a name="line-585"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FunPtr</span> <span class='hs-layout'>(</span><span class='hs-conid'>VertexCallback'</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-586"></a> <a name="line-587"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-588"></a><span class='hs-comment'>-- chapter 5.3: Callbacks (end)</span> <a name="line-589"></a> <a name="line-590"></a><a name="EndCallback"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>EndCallback</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-591"></a> <a name="line-592"></a><a name="withEndCallback"></a><span class='hs-definition'>withEndCallback</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>EndCallback</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <a name="line-593"></a><span class='hs-definition'>withEndCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>endCallback</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <a name="line-594"></a> <span class='hs-varid'>bracket</span> <span class='hs-layout'>(</span><span class='hs-varid'>makeEndCallback</span> <span class='hs-varid'>endCallback</span><span class='hs-layout'>)</span> <span class='hs-varid'>freeHaskellFunPtr</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>callbackPtr</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-595"></a> <span class='hs-varid'>setEndCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-layout'>(</span><span class='hs-varid'>marshalTessCallback</span> <span class='hs-conid'>TessEnd</span><span class='hs-layout'>)</span> <span class='hs-varid'>callbackPtr</span> <a name="line-596"></a> <span class='hs-varid'>action</span> <a name="line-597"></a> <a name="line-598"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-str'>"wrapper"</span> <span class='hs-varid'>makeEndCallback</span> <span class='hs-keyglyph'>::</span> <a name="line-599"></a> <span class='hs-conid'>EndCallback</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>FunPtr</span> <span class='hs-conid'>EndCallback</span><span class='hs-layout'>)</span> <a name="line-600"></a> <a name="line-601"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"gluTessCallback"</span> <span class='hs-varid'>setEndCallback</span> <span class='hs-keyglyph'>::</span> <a name="line-602"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FunPtr</span> <span class='hs-conid'>EndCallback</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-603"></a> <a name="line-604"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-605"></a><span class='hs-comment'>-- chapter 5.3: Callbacks (error)</span> <a name="line-606"></a> <a name="line-607"></a><a name="ErrorCallback"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>ErrorCallback</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-608"></a> <a name="line-609"></a><a name="withErrorCallback"></a><span class='hs-definition'>withErrorCallback</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ErrorCallback</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <a name="line-610"></a><span class='hs-definition'>withErrorCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>errorCallback</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <a name="line-611"></a> <span class='hs-varid'>bracket</span> <span class='hs-layout'>(</span><span class='hs-varid'>makeErrorCallback</span> <span class='hs-varid'>errorCallback</span><span class='hs-layout'>)</span> <a name="line-612"></a> <span class='hs-varid'>freeHaskellFunPtr</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>callbackPtr</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-613"></a> <span class='hs-varid'>setErrorCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-layout'>(</span><span class='hs-varid'>marshalTessCallback</span> <span class='hs-conid'>TessError</span><span class='hs-layout'>)</span> <span class='hs-varid'>callbackPtr</span> <a name="line-614"></a> <span class='hs-varid'>action</span> <a name="line-615"></a> <a name="line-616"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-str'>"wrapper"</span> <span class='hs-varid'>makeErrorCallback</span> <span class='hs-keyglyph'>::</span> <a name="line-617"></a> <span class='hs-conid'>ErrorCallback</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>FunPtr</span> <span class='hs-conid'>ErrorCallback</span><span class='hs-layout'>)</span> <a name="line-618"></a> <a name="line-619"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"gluTessCallback"</span> <span class='hs-varid'>setErrorCallback</span> <span class='hs-keyglyph'>::</span> <a name="line-620"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FunPtr</span> <span class='hs-conid'>ErrorCallback</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-621"></a> <a name="line-622"></a><a name="checkForError"></a><span class='hs-definition'>checkForError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <a name="line-623"></a><span class='hs-definition'>checkForError</span> <span class='hs-varid'>tessObj</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withErrorCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>recordErrorCode</span> <a name="line-624"></a> <a name="line-625"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-626"></a><span class='hs-comment'>-- chapter 5.3: Callbacks (combine)</span> <a name="line-627"></a> <a name="line-628"></a><a name="CombineCallback"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>CombineCallback</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <a name="line-629"></a> <span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex3</span> <span class='hs-conid'>GLdouble</span><span class='hs-layout'>)</span> <a name="line-630"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-631"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>GLclampf</span> <a name="line-632"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-633"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-634"></a> <a name="line-635"></a><a name="withCombineCallback"></a><span class='hs-definition'>withCombineCallback</span> <span class='hs-keyglyph'>::</span> <a name="line-636"></a> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Combiner</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <a name="line-637"></a><span class='hs-definition'>withCombineCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>combiner</span> <span class='hs-varid'>action</span> <span class='hs-keyglyph'>=</span> <a name="line-638"></a> <span class='hs-varid'>withPool</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>vertexPool</span> <span class='hs-keyglyph'>-></span> <a name="line-639"></a> <span class='hs-varid'>bracket</span> <span class='hs-layout'>(</span><span class='hs-varid'>makeCombineCallback</span> <span class='hs-layout'>(</span><span class='hs-varid'>combineProperties</span> <span class='hs-varid'>vertexPool</span> <span class='hs-varid'>combiner</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-640"></a> <span class='hs-varid'>freeHaskellFunPtr</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>callbackPtr</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-641"></a> <span class='hs-varid'>setCombineCallback</span> <span class='hs-varid'>tessObj</span> <span class='hs-layout'>(</span><span class='hs-varid'>marshalTessCallback</span> <span class='hs-conid'>TessCombine</span><span class='hs-layout'>)</span> <span class='hs-varid'>callbackPtr</span> <a name="line-642"></a> <span class='hs-varid'>action</span> <a name="line-643"></a> <a name="line-644"></a><a name="combineProperties"></a><span class='hs-comment'>-- NOTE: SGI's tesselator has a bug, sometimes passing NULL for the last two</span> <a name="line-645"></a><span class='hs-comment'>-- vertices instead of valid vertex data, so we have to work around this. We</span> <a name="line-646"></a><span class='hs-comment'>-- just pass the first vertex in these cases, which is OK, because the</span> <a name="line-647"></a><span class='hs-comment'>-- corresponding weight is 0.</span> <a name="line-648"></a><span class='hs-definition'>combineProperties</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Pool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Combiner</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CombineCallback</span> <span class='hs-varid'>v</span> <a name="line-649"></a><span class='hs-definition'>combineProperties</span> <span class='hs-varid'>pool</span> <span class='hs-varid'>combiner</span> <span class='hs-varid'>newVertexPtr</span> <span class='hs-varid'>propertyPtrs</span> <span class='hs-varid'>weights</span> <span class='hs-varid'>result</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-650"></a> <span class='hs-varid'>newVertex</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>peek</span> <span class='hs-varid'>newVertexPtr</span> <a name="line-651"></a> <span class='hs-keyglyph'>[</span><span class='hs-varid'>v0</span><span class='hs-layout'>,</span> <span class='hs-varid'>v1</span><span class='hs-layout'>,</span> <span class='hs-varid'>v2</span><span class='hs-layout'>,</span> <span class='hs-varid'>v3</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-layout'>(</span><span class='hs-varid'>getProperty</span> <span class='hs-varid'>propertyPtrs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>0</span><span class='hs-keyglyph'>..</span><span class='hs-num'>3</span><span class='hs-keyglyph'>]</span> <a name="line-652"></a> <span class='hs-keyglyph'>[</span><span class='hs-varid'>w0</span><span class='hs-layout'>,</span> <span class='hs-varid'>w1</span><span class='hs-layout'>,</span> <span class='hs-varid'>w2</span><span class='hs-layout'>,</span> <span class='hs-varid'>w3</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>peekArray</span> <span class='hs-num'>4</span> <span class='hs-varid'>weights</span> <a name="line-653"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>defaultProperty</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromJust</span> <span class='hs-varid'>v0</span> <a name="line-654"></a> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>defaultProperty</span> <span class='hs-varid'>id</span> <a name="line-655"></a> <span class='hs-varid'>wp</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>WeightedProperties</span> <span class='hs-layout'>(</span><span class='hs-varid'>w0</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span> <span class='hs-varid'>v0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>w1</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span> <span class='hs-varid'>v1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>w2</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span> <span class='hs-varid'>v2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>w3</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span> <span class='hs-varid'>v3</span><span class='hs-layout'>)</span> <a name="line-656"></a> <span class='hs-varid'>av</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>newVertex</span> <span class='hs-layout'>(</span><span class='hs-varid'>combiner</span> <span class='hs-varid'>newVertex</span> <span class='hs-varid'>wp</span><span class='hs-layout'>)</span> <a name="line-657"></a> <span class='hs-varid'>poke</span> <span class='hs-varid'>result</span> <span class='hs-varop'>=<<</span> <span class='hs-varid'>pooledNew</span> <span class='hs-varid'>pool</span> <span class='hs-varid'>av</span> <a name="line-658"></a> <a name="line-659"></a><a name="getProperty"></a><span class='hs-definition'>getProperty</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-660"></a><span class='hs-definition'>getProperty</span> <span class='hs-varid'>propertyPtrs</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>peekElemOff</span> <span class='hs-varid'>propertyPtrs</span> <span class='hs-varid'>n</span> <span class='hs-varop'>>>=</span> <a name="line-661"></a> <span class='hs-varid'>maybeNullPtr</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span> <span class='hs-varid'>peekProperty</span> <a name="line-662"></a> <a name="line-663"></a><a name="peekProperty"></a><span class='hs-definition'>peekProperty</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Storable</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span><span class='hs-conid'>AnnotatedVertex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-664"></a><span class='hs-definition'>peekProperty</span> <span class='hs-varid'>ptr</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-665"></a> <span class='hs-conid'>AnnotatedVertex</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>peek</span> <span class='hs-varid'>ptr</span> <a name="line-666"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <a name="line-667"></a> <a name="line-668"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-str'>"wrapper"</span> <span class='hs-varid'>makeCombineCallback</span> <span class='hs-keyglyph'>::</span> <a name="line-669"></a> <span class='hs-conid'>CombineCallback</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>FunPtr</span> <span class='hs-layout'>(</span><span class='hs-conid'>CombineCallback</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-670"></a> <a name="line-671"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"gluTessCallback"</span> <span class='hs-varid'>setCombineCallback</span> <span class='hs-keyglyph'>::</span> <a name="line-672"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>FunPtr</span> <span class='hs-layout'>(</span><span class='hs-conid'>CombineCallback</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-673"></a> <a name="line-674"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-675"></a><span class='hs-comment'>-- chapter 5.4: Control over Tessellation</span> <a name="line-676"></a> <a name="line-677"></a><a name="setTessellatorProperties"></a><span class='hs-definition'>setTessellatorProperties</span> <span class='hs-keyglyph'>::</span> <a name="line-678"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TessWinding</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Tolerance</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Normal3</span> <span class='hs-conid'>GLdouble</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <a name="line-679"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-680"></a><span class='hs-definition'>setTessellatorProperties</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>windingRule</span> <span class='hs-varid'>tolerance</span> <span class='hs-varid'>normal</span> <span class='hs-varid'>boundaryOnly</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-681"></a> <span class='hs-varid'>setWindingRule</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>windingRule</span> <a name="line-682"></a> <span class='hs-varid'>setTolerance</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>tolerance</span> <a name="line-683"></a> <span class='hs-varid'>setNormal</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>normal</span> <a name="line-684"></a> <span class='hs-varid'>setBoundaryOnly</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>boundaryOnly</span> <a name="line-685"></a> <a name="line-686"></a><a name="setWindingRule"></a><span class='hs-definition'>setWindingRule</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TessWinding</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-687"></a><span class='hs-definition'>setWindingRule</span> <span class='hs-varid'>tessObj</span> <span class='hs-keyglyph'>=</span> <a name="line-688"></a> <span class='hs-varid'>tessProperty</span> <span class='hs-varid'>tessObj</span> <span class='hs-conid'>TessWindingRule</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>.</span> <span class='hs-varid'>marshalTessWinding</span> <a name="line-689"></a> <a name="line-690"></a><a name="setBoundaryOnly"></a><span class='hs-definition'>setBoundaryOnly</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-691"></a><span class='hs-definition'>setBoundaryOnly</span> <span class='hs-varid'>tessObj</span> <span class='hs-keyglyph'>=</span> <a name="line-692"></a> <span class='hs-varid'>tessProperty</span> <span class='hs-varid'>tessObj</span> <span class='hs-conid'>TessBoundaryOnly</span> <span class='hs-varop'>.</span> <span class='hs-varid'>marshalGLboolean</span> <a name="line-693"></a> <a name="line-694"></a><a name="setTolerance"></a><span class='hs-definition'>setTolerance</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Tolerance</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-695"></a><span class='hs-definition'>setTolerance</span> <span class='hs-varid'>tessObj</span> <span class='hs-keyglyph'>=</span> <a name="line-696"></a> <span class='hs-varid'>tessProperty</span> <span class='hs-varid'>tessObj</span> <span class='hs-conid'>TessTolerance</span> <a name="line-697"></a> <a name="line-698"></a><a name="tessProperty"></a><span class='hs-definition'>tessProperty</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TessProperty</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLdouble</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-699"></a><span class='hs-definition'>tessProperty</span> <span class='hs-varid'>tessObj</span> <span class='hs-keyglyph'>=</span> <a name="line-700"></a> <span class='hs-varid'>gluTessProperty</span> <span class='hs-varid'>tessObj</span> <span class='hs-varop'>.</span> <span class='hs-varid'>marshalTessProperty</span> <a name="line-701"></a> <a name="line-702"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"gluTessProperty"</span> <span class='hs-varid'>gluTessProperty</span> <span class='hs-keyglyph'>::</span> <a name="line-703"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLdouble</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-704"></a> <a name="line-705"></a><a name="setNormal"></a><span class='hs-definition'>setNormal</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Normal3</span> <span class='hs-conid'>GLdouble</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-706"></a><span class='hs-definition'>setNormal</span> <span class='hs-varid'>tessObj</span> <span class='hs-layout'>(</span><span class='hs-conid'>Normal3</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>gluTessNormal</span> <span class='hs-varid'>tessObj</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>z</span> <a name="line-707"></a> <a name="line-708"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"gluTessNormal"</span> <span class='hs-varid'>gluTessNormal</span> <span class='hs-keyglyph'>::</span> <a name="line-709"></a> <span class='hs-conid'>TessellatorObj</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLdouble</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLdouble</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLdouble</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> </pre></body> </html>
