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<title>Graphics/Gloss/Internals/Render/Picture.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS -fwarn-incomplete-patterns #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# OPTIONS_HADDOCK hide #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE ImplicitParams, ScopedTypeVariables #-}</span>
<a name="line-4"></a>
<a name="line-5"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Render</span><span class='hs-varop'>.</span><span class='hs-conid'>Picture</span>
<a name="line-6"></a> <span class='hs-layout'>(</span><span class='hs-varid'>renderPicture</span><span class='hs-layout'>)</span>
<a name="line-7"></a><span class='hs-keyword'>where</span>
<a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Picture</span>
<a name="line-9"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Color</span>
<a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Interface</span><span class='hs-varop'>.</span><span class='hs-conid'>Backend</span>
<a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Interface</span><span class='hs-varop'>.</span><span class='hs-conid'>ViewPort</span>
<a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Render</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span>
<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Render</span><span class='hs-varop'>.</span><span class='hs-conid'>Common</span>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Render</span><span class='hs-varop'>.</span><span class='hs-conid'>Circle</span>
<a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Render</span><span class='hs-varop'>.</span><span class='hs-conid'>Bitmap</span>
<a name="line-16"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Mem</span><span class='hs-varop'>.</span><span class='hs-conid'>StableName</span>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>ForeignPtr</span>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-21"></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-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>$=</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>get</span><span class='hs-layout'>)</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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-keyword'>as</span> <span class='hs-conid'>GL</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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'>Errors</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>GLU</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>UI</span><span class='hs-varop'>.</span><span class='hs-conid'>GLUT</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>GLUT</span>
<a name="line-25"></a>
<a name="line-26"></a>
<a name="line-27"></a><a name="renderPicture"></a><span class='hs-comment'>-- | Render a picture using the given render options and viewport.</span>
<a name="line-28"></a><span class='hs-definition'>renderPicture</span>
<a name="line-29"></a> <span class='hs-keyglyph'>::</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Backend</span> <span class='hs-varid'>a</span>
<a name="line-30"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>IORef</span> <span class='hs-varid'>a</span>
<a name="line-31"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>State</span> <span class='hs-comment'>-- ^ The render state</span>
<a name="line-32"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ViewPort</span> <span class='hs-comment'>-- ^ The current viewport.</span>
<a name="line-33"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Picture</span> <span class='hs-comment'>-- ^ The picture to render.</span>
<a name="line-34"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-definition'>renderPicture</span>
<a name="line-37"></a> <span class='hs-varid'>backendRef</span>
<a name="line-38"></a> <span class='hs-varid'>renderS</span>
<a name="line-39"></a> <span class='hs-varid'>viewS</span>
<a name="line-40"></a> <span class='hs-varid'>picture</span>
<a name="line-41"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-42"></a> <span class='hs-comment'>-- This GL state doesn't change during rendering, </span>
<a name="line-43"></a> <span class='hs-comment'>-- so we can just read it once here</span>
<a name="line-44"></a> <span class='hs-layout'>(</span><span class='hs-varid'>matProj_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>GLmatrix</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>GLdouble</span><span class='hs-layout'>)</span>
<a name="line-45"></a> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>get</span> <span class='hs-varop'>$</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>matrix</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Projection</span><span class='hs-layout'>)</span>
<a name="line-46"></a> <span class='hs-varid'>viewport_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>get</span> <span class='hs-varop'>$</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>viewport</span>
<a name="line-47"></a> <span class='hs-varid'>windowSize_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getWindowDimensions</span> <span class='hs-varid'>backendRef</span>
<a name="line-48"></a>
<a name="line-49"></a> <span class='hs-comment'>-- </span>
<a name="line-50"></a> <span class='hs-keyword'>let</span> <span class='hs-varop'>?</span><span class='hs-varid'>modeWireframe</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>stateWireframe</span> <span class='hs-varid'>renderS</span>
<a name="line-51"></a> <span class='hs-varop'>?</span><span class='hs-varid'>modeColor</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>stateColor</span> <span class='hs-varid'>renderS</span>
<a name="line-52"></a> <span class='hs-varop'>?</span><span class='hs-varid'>refTextures</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>stateTextures</span> <span class='hs-varid'>renderS</span>
<a name="line-53"></a> <span class='hs-varop'>?</span><span class='hs-varid'>matProj</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>matProj_</span>
<a name="line-54"></a> <span class='hs-varop'>?</span><span class='hs-varid'>viewport</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>viewport_</span>
<a name="line-55"></a> <span class='hs-varop'>?</span><span class='hs-varid'>windowSize</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>windowSize_</span>
<a name="line-56"></a>
<a name="line-57"></a> <span class='hs-comment'>-- setup render state for world</span>
<a name="line-58"></a> <span class='hs-varid'>setLineSmooth</span> <span class='hs-layout'>(</span><span class='hs-varid'>stateLineSmooth</span> <span class='hs-varid'>renderS</span><span class='hs-layout'>)</span>
<a name="line-59"></a> <span class='hs-varid'>setBlendAlpha</span> <span class='hs-layout'>(</span><span class='hs-varid'>stateBlendAlpha</span> <span class='hs-varid'>renderS</span><span class='hs-layout'>)</span>
<a name="line-60"></a>
<a name="line-61"></a> <span class='hs-varid'>checkErrors</span> <span class='hs-str'>"before drawPicture."</span>
<a name="line-62"></a> <span class='hs-varid'>drawPicture</span> <span class='hs-layout'>(</span><span class='hs-varid'>viewPortScale</span> <span class='hs-varid'>viewS</span><span class='hs-layout'>)</span> <span class='hs-varid'>picture</span>
<a name="line-63"></a> <span class='hs-varid'>checkErrors</span> <span class='hs-str'>"after drawPicture."</span>
<a name="line-64"></a>
<a name="line-65"></a>
<a name="line-66"></a><a name="drawPicture"></a><span class='hs-definition'>drawPicture</span>
<a name="line-67"></a> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span> <span class='hs-varop'>?</span><span class='hs-varid'>modeWireframe</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span>
<a name="line-68"></a> <span class='hs-layout'>,</span> <span class='hs-varop'>?</span><span class='hs-varid'>modeColor</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span>
<a name="line-69"></a> <span class='hs-layout'>,</span> <span class='hs-varop'>?</span><span class='hs-varid'>refTextures</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IORef</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Texture</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-70"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Float</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Picture</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-71"></a>
<a name="line-72"></a><span class='hs-definition'>drawPicture</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>picture</span>
<a name="line-73"></a> <span class='hs-keyglyph'>=</span> <span class='hs-comment'>{-# SCC "drawComponent" #-}</span>
<a name="line-74"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>picture</span> <span class='hs-keyword'>of</span>
<a name="line-75"></a>
<a name="line-76"></a> <span class='hs-comment'>-- nothin'</span>
<a name="line-77"></a> <span class='hs-conid'>Blank</span>
<a name="line-78"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-79"></a>
<a name="line-80"></a> <span class='hs-comment'>-- line</span>
<a name="line-81"></a> <span class='hs-conid'>Line</span> <span class='hs-varid'>path</span>
<a name="line-82"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>renderPrimitive</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>LineStrip</span>
<a name="line-83"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>vertexPFs</span> <span class='hs-varid'>path</span>
<a name="line-84"></a>
<a name="line-85"></a>
<a name="line-86"></a> <span class='hs-comment'>-- polygon (where?)</span>
<a name="line-87"></a> <span class='hs-conid'>Polygon</span> <span class='hs-varid'>path</span>
<a name="line-88"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varop'>?</span><span class='hs-varid'>modeWireframe</span>
<a name="line-89"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>renderPrimitive</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>LineLoop</span>
<a name="line-90"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>vertexPFs</span> <span class='hs-varid'>path</span>
<a name="line-91"></a>
<a name="line-92"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>
<a name="line-93"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>renderPrimitive</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Polygon</span>
<a name="line-94"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>vertexPFs</span> <span class='hs-varid'>path</span>
<a name="line-95"></a>
<a name="line-96"></a> <span class='hs-comment'>-- circle</span>
<a name="line-97"></a> <span class='hs-conid'>Circle</span> <span class='hs-varid'>radius</span>
<a name="line-98"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>renderCircle</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>radius</span> <span class='hs-num'>0</span>
<a name="line-99"></a>
<a name="line-100"></a> <span class='hs-conid'>ThickCircle</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>thickness</span>
<a name="line-101"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>renderCircle</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>thickness</span>
<a name="line-102"></a>
<a name="line-103"></a> <span class='hs-comment'>-- arc</span>
<a name="line-104"></a> <span class='hs-conid'>Arc</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-varid'>radius</span>
<a name="line-105"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>renderArc</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-num'>0</span>
<a name="line-106"></a>
<a name="line-107"></a> <span class='hs-conid'>ThickArc</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>thickness</span>
<a name="line-108"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>renderArc</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-varid'>thickness</span>
<a name="line-109"></a>
<a name="line-110"></a> <span class='hs-comment'>-- stroke text</span>
<a name="line-111"></a> <span class='hs-comment'>-- text looks weird when we've got blend on,</span>
<a name="line-112"></a> <span class='hs-comment'>-- so disable it during the renderString call.</span>
<a name="line-113"></a> <span class='hs-conid'>Text</span> <span class='hs-varid'>str</span>
<a name="line-114"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-115"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>blend</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Disabled</span>
<a name="line-116"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>preservingMatrix</span> <span class='hs-varop'>$</span> <span class='hs-conid'>GLUT</span><span class='hs-varop'>.</span><span class='hs-varid'>renderString</span> <span class='hs-conid'>GLUT</span><span class='hs-varop'>.</span><span class='hs-conid'>Roman</span> <span class='hs-varid'>str</span>
<a name="line-117"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>blend</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Enabled</span>
<a name="line-118"></a>
<a name="line-119"></a> <span class='hs-comment'>-- colors with float components.</span>
<a name="line-120"></a> <span class='hs-conid'>Color</span> <span class='hs-varid'>col</span> <span class='hs-varid'>p</span>
<a name="line-121"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varop'>?</span><span class='hs-varid'>modeColor</span>
<a name="line-122"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>oldColor</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>get</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>currentColor</span>
<a name="line-123"></a>
<a name="line-124"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>g</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rgbaOfColor</span> <span class='hs-varid'>col</span>
<a name="line-125"></a>
<a name="line-126"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>currentColor</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Color4</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-127"></a> <span class='hs-varid'>drawPicture</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>p</span>
<a name="line-128"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>currentColor</span> <span class='hs-varop'>$=</span> <span class='hs-varid'>oldColor</span>
<a name="line-129"></a>
<a name="line-130"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>
<a name="line-131"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>drawPicture</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>p</span>
<a name="line-132"></a>
<a name="line-133"></a>
<a name="line-134"></a> <span class='hs-comment'>-- Translation --------------------------</span>
<a name="line-135"></a> <span class='hs-comment'>-- Easy translations are done directly to avoid calling GL.perserveMatrix.</span>
<a name="line-136"></a> <span class='hs-conid'>Translate</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-layout'>(</span><span class='hs-conid'>Circle</span> <span class='hs-varid'>radius</span><span class='hs-layout'>)</span>
<a name="line-137"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>renderCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>radius</span> <span class='hs-num'>0</span>
<a name="line-138"></a>
<a name="line-139"></a> <span class='hs-conid'>Translate</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-layout'>(</span><span class='hs-conid'>ThickCircle</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>thickness</span><span class='hs-layout'>)</span>
<a name="line-140"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>renderCircle</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>thickness</span>
<a name="line-141"></a>
<a name="line-142"></a> <span class='hs-conid'>Translate</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-layout'>(</span><span class='hs-conid'>Arc</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-varid'>radius</span><span class='hs-layout'>)</span>
<a name="line-143"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>renderArc</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-num'>0</span>
<a name="line-144"></a>
<a name="line-145"></a> <span class='hs-conid'>Translate</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-layout'>(</span><span class='hs-conid'>ThickArc</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>thickness</span><span class='hs-layout'>)</span>
<a name="line-146"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>renderArc</span> <span class='hs-varid'>posX</span> <span class='hs-varid'>posY</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-varid'>thickness</span>
<a name="line-147"></a>
<a name="line-148"></a> <span class='hs-conid'>Translate</span> <span class='hs-varid'>tx</span> <span class='hs-varid'>ty</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rotate</span> <span class='hs-varid'>deg</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-149"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>preservingMatrix</span>
<a name="line-150"></a> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>translate</span> <span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Vector3</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>tx</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>ty</span><span class='hs-layout'>)</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-151"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>rotate</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>deg</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Vector3</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-152"></a> <span class='hs-varid'>drawPicture</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>p</span>
<a name="line-153"></a>
<a name="line-154"></a> <span class='hs-conid'>Translate</span> <span class='hs-varid'>tx</span> <span class='hs-varid'>ty</span> <span class='hs-varid'>p</span>
<a name="line-155"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>preservingMatrix</span>
<a name="line-156"></a> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>translate</span> <span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Vector3</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>tx</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>ty</span><span class='hs-layout'>)</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-157"></a> <span class='hs-varid'>drawPicture</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>p</span>
<a name="line-158"></a>
<a name="line-159"></a>
<a name="line-160"></a> <span class='hs-comment'>-- Rotation -----------------------------</span>
<a name="line-161"></a> <span class='hs-comment'>-- Easy rotations are done directly to avoid calling GL.perserveMatrix.</span>
<a name="line-162"></a> <span class='hs-conid'>Rotate</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>Circle</span> <span class='hs-varid'>radius</span><span class='hs-layout'>)</span>
<a name="line-163"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>renderCircle</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>radius</span> <span class='hs-num'>0</span>
<a name="line-164"></a>
<a name="line-165"></a> <span class='hs-conid'>Rotate</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>ThickCircle</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>thickness</span><span class='hs-layout'>)</span>
<a name="line-166"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>renderCircle</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>thickness</span>
<a name="line-167"></a>
<a name="line-168"></a> <span class='hs-conid'>Rotate</span> <span class='hs-varid'>deg</span> <span class='hs-layout'>(</span><span class='hs-conid'>Arc</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-varid'>radius</span><span class='hs-layout'>)</span>
<a name="line-169"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>renderArc</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>radius</span> <span class='hs-layout'>(</span><span class='hs-varid'>a1</span><span class='hs-comment'>-</span><span class='hs-varid'>deg</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a2</span><span class='hs-comment'>-</span><span class='hs-varid'>deg</span><span class='hs-layout'>)</span> <span class='hs-num'>0</span>
<a name="line-170"></a>
<a name="line-171"></a> <span class='hs-conid'>Rotate</span> <span class='hs-varid'>deg</span> <span class='hs-layout'>(</span><span class='hs-conid'>ThickArc</span> <span class='hs-varid'>a1</span> <span class='hs-varid'>a2</span> <span class='hs-varid'>radius</span> <span class='hs-varid'>thickness</span><span class='hs-layout'>)</span>
<a name="line-172"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>renderArc</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>radius</span> <span class='hs-layout'>(</span><span class='hs-varid'>a1</span><span class='hs-comment'>-</span><span class='hs-varid'>deg</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>a2</span><span class='hs-comment'>-</span><span class='hs-varid'>deg</span><span class='hs-layout'>)</span> <span class='hs-varid'>thickness</span>
<a name="line-173"></a>
<a name="line-174"></a>
<a name="line-175"></a> <span class='hs-conid'>Rotate</span> <span class='hs-varid'>deg</span> <span class='hs-varid'>p</span>
<a name="line-176"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>preservingMatrix</span>
<a name="line-177"></a> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>rotate</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>deg</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Vector3</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-178"></a> <span class='hs-varid'>drawPicture</span> <span class='hs-varid'>circScale</span> <span class='hs-varid'>p</span>
<a name="line-179"></a>
<a name="line-180"></a>
<a name="line-181"></a> <span class='hs-comment'>-- Scale --------------------------------</span>
<a name="line-182"></a> <span class='hs-conid'>Scale</span> <span class='hs-varid'>sx</span> <span class='hs-varid'>sy</span> <span class='hs-varid'>p</span>
<a name="line-183"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>preservingMatrix</span>
<a name="line-184"></a> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>scale</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>sx</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>sy</span><span class='hs-layout'>)</span> <span class='hs-num'>1</span>
<a name="line-185"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>mscale</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>max</span> <span class='hs-varid'>sx</span> <span class='hs-varid'>sy</span>
<a name="line-186"></a> <span class='hs-varid'>drawPicture</span> <span class='hs-layout'>(</span><span class='hs-varid'>circScale</span> <span class='hs-varop'>*</span> <span class='hs-varid'>mscale</span><span class='hs-layout'>)</span> <span class='hs-varid'>p</span>
<a name="line-187"></a>
<a name="line-188"></a> <span class='hs-comment'>-- Bitmap -------------------------------</span>
<a name="line-189"></a> <span class='hs-conid'>Bitmap</span> <span class='hs-varid'>width</span> <span class='hs-varid'>height</span> <span class='hs-varid'>imgData</span> <span class='hs-varid'>cacheMe</span>
<a name="line-190"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-191"></a> <span class='hs-comment'>-- Load the image data into a texture,</span>
<a name="line-192"></a> <span class='hs-comment'>-- or grab it from the cache if we've already done that before.</span>
<a name="line-193"></a> <span class='hs-varid'>tex</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>loadTexture</span> <span class='hs-varop'>?</span><span class='hs-varid'>refTextures</span> <span class='hs-varid'>width</span> <span class='hs-varid'>height</span> <span class='hs-varid'>imgData</span> <span class='hs-varid'>cacheMe</span>
<a name="line-194"></a>
<a name="line-195"></a> <span class='hs-comment'>-- Set up wrap and filtering mode</span>
<a name="line-196"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>textureWrapMode</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Texture2D</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>S</span> <span class='hs-varop'>$=</span> <span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Repeated</span><span class='hs-layout'>,</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Repeat</span><span class='hs-layout'>)</span>
<a name="line-197"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>textureWrapMode</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Texture2D</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>T</span> <span class='hs-varop'>$=</span> <span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Repeated</span><span class='hs-layout'>,</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Repeat</span><span class='hs-layout'>)</span>
<a name="line-198"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>textureFilter</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Texture2D</span> <span class='hs-varop'>$=</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Nearest</span><span class='hs-layout'>,</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Nearest</span><span class='hs-layout'>)</span>
<a name="line-199"></a>
<a name="line-200"></a> <span class='hs-comment'>-- Enable texturing</span>
<a name="line-201"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>texture</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Texture2D</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Enabled</span>
<a name="line-202"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>textureFunction</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Combine</span>
<a name="line-203"></a>
<a name="line-204"></a> <span class='hs-comment'>-- Set current texture</span>
<a name="line-205"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>textureBinding</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Texture2D</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>texObject</span> <span class='hs-varid'>tex</span><span class='hs-layout'>)</span>
<a name="line-206"></a>
<a name="line-207"></a> <span class='hs-comment'>-- Set to opaque</span>
<a name="line-208"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>currentColor</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Color4</span> <span class='hs-num'>1.0</span> <span class='hs-num'>1.0</span> <span class='hs-num'>1.0</span> <span class='hs-num'>1.0</span>
<a name="line-209"></a>
<a name="line-210"></a> <span class='hs-comment'>-- Draw textured polygon</span>
<a name="line-211"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>renderPrimitive</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Polygon</span>
<a name="line-212"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>zipWithM_</span>
<a name="line-213"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-varid'>pX</span><span class='hs-layout'>,</span> <span class='hs-varid'>pY</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>tX</span><span class='hs-layout'>,</span> <span class='hs-varid'>tY</span><span class='hs-layout'>)</span>
<a name="line-214"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>texCoord</span> <span class='hs-varop'>$</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>TexCoord2</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>tX</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>tY</span><span class='hs-layout'>)</span>
<a name="line-215"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>vertex</span> <span class='hs-varop'>$</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Vertex2</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>pX</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>pY</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-216"></a>
<a name="line-217"></a> <span class='hs-layout'>(</span><span class='hs-varid'>bitmapPath</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>width</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>height</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-218"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span><span class='hs-num'>0</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>1.0</span><span class='hs-layout'>,</span><span class='hs-num'>0</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>1.0</span><span class='hs-layout'>,</span><span class='hs-num'>1.0</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span><span class='hs-num'>1.0</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-219"></a>
<a name="line-220"></a> <span class='hs-comment'>-- Disable texturing</span>
<a name="line-221"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>texture</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Texture2D</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Disabled</span>
<a name="line-222"></a>
<a name="line-223"></a> <span class='hs-comment'>-- Free uncachable texture objects.</span>
<a name="line-224"></a> <span class='hs-varid'>freeTexture</span> <span class='hs-varid'>tex</span>
<a name="line-225"></a>
<a name="line-226"></a>
<a name="line-227"></a> <span class='hs-conid'>Pictures</span> <span class='hs-varid'>ps</span>
<a name="line-228"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mapM_</span> <span class='hs-layout'>(</span><span class='hs-varid'>drawPicture</span> <span class='hs-varid'>circScale</span><span class='hs-layout'>)</span> <span class='hs-varid'>ps</span>
<a name="line-229"></a>
<a name="line-230"></a><a name="checkErrors"></a><span class='hs-comment'>-- Errors ---------------------------------------------------------------------</span>
<a name="line-231"></a><span class='hs-definition'>checkErrors</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-232"></a><span class='hs-definition'>checkErrors</span> <span class='hs-varid'>place</span>
<a name="line-233"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>errors</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>get</span> <span class='hs-varop'>$</span> <span class='hs-conid'>GLU</span><span class='hs-varop'>.</span><span class='hs-varid'>errors</span>
<a name="line-234"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varop'>$</span> <span class='hs-varid'>null</span> <span class='hs-varid'>errors</span><span class='hs-layout'>)</span>
<a name="line-235"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>mapM_</span> <span class='hs-layout'>(</span><span class='hs-varid'>handleError</span> <span class='hs-varid'>place</span><span class='hs-layout'>)</span> <span class='hs-varid'>errors</span>
<a name="line-236"></a>
<a name="line-237"></a><a name="handleError"></a><span class='hs-definition'>handleError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLU</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-238"></a><span class='hs-definition'>handleError</span> <span class='hs-varid'>place</span> <span class='hs-varid'>err</span>
<a name="line-239"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>err</span> <span class='hs-keyword'>of</span>
<a name="line-240"></a> <span class='hs-conid'>GLU</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span> <span class='hs-conid'>GLU</span><span class='hs-varop'>.</span><span class='hs-conid'>StackOverflow</span> <span class='hs-keyword'>_</span>
<a name="line-241"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unlines</span>
<a name="line-242"></a> <span class='hs-keyglyph'>[</span> <span class='hs-str'>"Gloss / OpenGL Stack Overflow "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>place</span>
<a name="line-243"></a> <span class='hs-layout'>,</span> <span class='hs-str'>" This program uses the Gloss vector graphics library, which tried to"</span>
<a name="line-244"></a> <span class='hs-layout'>,</span> <span class='hs-str'>" draw a picture using more nested transforms (Translate/Rotate/Scale)"</span>
<a name="line-245"></a> <span class='hs-layout'>,</span> <span class='hs-str'>" than your OpenGL implementation supports. The OpenGL spec requires"</span>
<a name="line-246"></a> <span class='hs-layout'>,</span> <span class='hs-str'>" all implementations to have a transform stack depth of at least 32,"</span>
<a name="line-247"></a> <span class='hs-layout'>,</span> <span class='hs-str'>" and Gloss tries not to push the stack when it doesn't have to, but"</span>
<a name="line-248"></a> <span class='hs-layout'>,</span> <span class='hs-str'>" that still wasn't enough."</span>
<a name="line-249"></a> <span class='hs-layout'>,</span> <span class='hs-str'>""</span>
<a name="line-250"></a> <span class='hs-layout'>,</span> <span class='hs-str'>" You should complain to your harware vendor that they don't provide"</span>
<a name="line-251"></a> <span class='hs-layout'>,</span> <span class='hs-str'>" a better way to handle this situation at the OpenGL API level."</span>
<a name="line-252"></a> <span class='hs-layout'>,</span> <span class='hs-str'>""</span>
<a name="line-253"></a> <span class='hs-layout'>,</span> <span class='hs-str'>" To make this program work you'll need to reduce the number of nested"</span>
<a name="line-254"></a> <span class='hs-layout'>,</span> <span class='hs-str'>" transforms used when defining the Picture given to Gloss. Sorry."</span> <span class='hs-keyglyph'>]</span>
<a name="line-255"></a>
<a name="line-256"></a> <span class='hs-comment'>-- Issue #32: Spurious "Invalid Operation" errors under Windows 7 64-bit.</span>
<a name="line-257"></a> <span class='hs-comment'>-- When using GLUT under Windows 7 it complains about InvalidOperation, </span>
<a name="line-258"></a> <span class='hs-comment'>-- but doesn't provide any other details. All the examples look ok, so </span>
<a name="line-259"></a> <span class='hs-comment'>-- we're just ignoring the error for now.</span>
<a name="line-260"></a> <span class='hs-conid'>GLU</span><span class='hs-varop'>.</span><span class='hs-conid'>Error</span> <span class='hs-conid'>GLU</span><span class='hs-varop'>.</span><span class='hs-conid'>InvalidOperation</span> <span class='hs-keyword'>_</span>
<a name="line-261"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-262"></a> <span class='hs-keyword'>_</span>
<a name="line-263"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unlines</span>
<a name="line-264"></a> <span class='hs-keyglyph'>[</span> <span class='hs-str'>"Gloss / OpenGL Internal Error "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>place</span>
<a name="line-265"></a> <span class='hs-layout'>,</span> <span class='hs-str'>" Please report this on haskell-gloss@googlegroups.com."</span>
<a name="line-266"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>show</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>]</span>
<a name="line-267"></a>
<a name="line-268"></a>
<a name="line-269"></a><a name="loadTexture"></a><span class='hs-comment'>-- Textures -------------------------------------------------------------------</span>
<a name="line-270"></a><span class='hs-comment'>-- | Load a texture.</span>
<a name="line-271"></a><span class='hs-comment'>-- If we've seen it before then use the pre-installed one from the texture</span>
<a name="line-272"></a><span class='hs-comment'>-- cache, otherwise load it into OpenGL.</span>
<a name="line-273"></a><span class='hs-definition'>loadTexture</span>
<a name="line-274"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IORef</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Texture</span><span class='hs-keyglyph'>]</span>
<a name="line-275"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>BitmapData</span>
<a name="line-276"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-277"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Texture</span>
<a name="line-278"></a>
<a name="line-279"></a><span class='hs-definition'>loadTexture</span> <span class='hs-varid'>refTextures</span> <span class='hs-varid'>width</span> <span class='hs-varid'>height</span> <span class='hs-varid'>imgData</span> <span class='hs-varid'>cacheMe</span>
<a name="line-280"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>textures</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>refTextures</span>
<a name="line-281"></a>
<a name="line-282"></a> <span class='hs-comment'>-- Try and find this same texture in the cache.</span>
<a name="line-283"></a> <span class='hs-varid'>name</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>makeStableName</span> <span class='hs-varid'>imgData</span>
<a name="line-284"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>mTexCached</span>
<a name="line-285"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>find</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>tex</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>texName</span> <span class='hs-varid'>tex</span> <span class='hs-varop'>==</span> <span class='hs-varid'>name</span>
<a name="line-286"></a> <span class='hs-varop'>&&</span> <span class='hs-varid'>texWidth</span> <span class='hs-varid'>tex</span> <span class='hs-varop'>==</span> <span class='hs-varid'>width</span>
<a name="line-287"></a> <span class='hs-varop'>&&</span> <span class='hs-varid'>texHeight</span> <span class='hs-varid'>tex</span> <span class='hs-varop'>==</span> <span class='hs-varid'>height</span><span class='hs-layout'>)</span>
<a name="line-288"></a> <span class='hs-varid'>textures</span>
<a name="line-289"></a>
<a name="line-290"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>mTexCached</span> <span class='hs-keyword'>of</span>
<a name="line-291"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>tex</span>
<a name="line-292"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>tex</span>
<a name="line-293"></a>
<a name="line-294"></a> <span class='hs-conid'>Nothing</span>
<a name="line-295"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>tex</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>installTexture</span> <span class='hs-varid'>width</span> <span class='hs-varid'>height</span> <span class='hs-varid'>imgData</span> <span class='hs-varid'>cacheMe</span>
<a name="line-296"></a> <span class='hs-varid'>when</span> <span class='hs-varid'>cacheMe</span>
<a name="line-297"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>refTextures</span> <span class='hs-layout'>(</span><span class='hs-varid'>tex</span> <span class='hs-conop'>:</span> <span class='hs-varid'>textures</span><span class='hs-layout'>)</span>
<a name="line-298"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>tex</span>
<a name="line-299"></a>
<a name="line-300"></a>
<a name="line-301"></a><a name="installTexture"></a><span class='hs-comment'>-- | Install a texture into OpenGL.</span>
<a name="line-302"></a><span class='hs-definition'>installTexture</span>
<a name="line-303"></a> <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-304"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>BitmapData</span>
<a name="line-305"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-306"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Texture</span>
<a name="line-307"></a>
<a name="line-308"></a><span class='hs-definition'>installTexture</span> <span class='hs-varid'>width</span> <span class='hs-varid'>height</span> <span class='hs-varid'>bitmapData</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>BitmapData</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>fptr</span><span class='hs-layout'>)</span> <span class='hs-varid'>cacheMe</span>
<a name="line-309"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-310"></a> <span class='hs-comment'>-- Allocate texture handle for texture</span>
<a name="line-311"></a> <span class='hs-keyglyph'>[</span><span class='hs-varid'>tex</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>genObjectNames</span> <span class='hs-num'>1</span>
<a name="line-312"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>textureBinding</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Texture2D</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>tex</span>
<a name="line-313"></a>
<a name="line-314"></a> <span class='hs-comment'>-- Sets the texture in imgData as the current texture</span>
<a name="line-315"></a> <span class='hs-comment'>-- This copies the data from the pointer into OpenGL texture memory, </span>
<a name="line-316"></a> <span class='hs-comment'>-- so it's ok if the foreignptr gets garbage collected after this.</span>
<a name="line-317"></a> <span class='hs-varid'>withForeignPtr</span> <span class='hs-varid'>fptr</span>
<a name="line-318"></a> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>ptr</span> <span class='hs-keyglyph'>-></span>
<a name="line-319"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>texImage2D</span>
<a name="line-320"></a> <span class='hs-conid'>Nothing</span>
<a name="line-321"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>NoProxy</span>
<a name="line-322"></a> <span class='hs-num'>0</span>
<a name="line-323"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>RGBA8</span>
<a name="line-324"></a> <span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>TextureSize2D</span>
<a name="line-325"></a> <span class='hs-layout'>(</span><span class='hs-varid'>gsizei</span> <span class='hs-varid'>width</span><span class='hs-layout'>)</span>
<a name="line-326"></a> <span class='hs-layout'>(</span><span class='hs-varid'>gsizei</span> <span class='hs-varid'>height</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-327"></a> <span class='hs-num'>0</span>
<a name="line-328"></a> <span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>PixelData</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>RGBA</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>UnsignedInt8888</span> <span class='hs-varid'>ptr</span><span class='hs-layout'>)</span>
<a name="line-329"></a>
<a name="line-330"></a> <span class='hs-comment'>-- Make a stable name that we can use to identify this data again.</span>
<a name="line-331"></a> <span class='hs-comment'>-- If the user gives us the same texture data at the same size then we</span>
<a name="line-332"></a> <span class='hs-comment'>-- can avoid loading it into texture memory again.</span>
<a name="line-333"></a> <span class='hs-varid'>name</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>makeStableName</span> <span class='hs-varid'>bitmapData</span>
<a name="line-334"></a>
<a name="line-335"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>Texture</span>
<a name="line-336"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>texName</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>name</span>
<a name="line-337"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>texWidth</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>width</span>
<a name="line-338"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>texHeight</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>height</span>
<a name="line-339"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>texData</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fptr</span>
<a name="line-340"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>texObject</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tex</span>
<a name="line-341"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>texCacheMe</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>cacheMe</span> <span class='hs-layout'>}</span>
<a name="line-342"></a>
<a name="line-343"></a>
<a name="line-344"></a><a name="freeTexture"></a><span class='hs-comment'>-- | If this texture does not have its `cacheMe` flag set then delete it from </span>
<a name="line-345"></a><span class='hs-comment'>-- OpenGL and free the memory.</span>
<a name="line-346"></a><span class='hs-definition'>freeTexture</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Texture</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-347"></a><span class='hs-definition'>freeTexture</span> <span class='hs-varid'>tex</span>
<a name="line-348"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>texCacheMe</span> <span class='hs-varid'>tex</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-349"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>deleteObjectNames</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>texObject</span> <span class='hs-varid'>tex</span><span class='hs-keyglyph'>]</span>
<a name="line-350"></a>
<a name="line-351"></a>
<a name="line-352"></a>
<a name="line-353"></a><a name="setBlendAlpha"></a><span class='hs-comment'>-- Utils ----------------------------------------------------------------------</span>
<a name="line-354"></a><span class='hs-comment'>-- | Turn alpha blending on or off</span>
<a name="line-355"></a><span class='hs-definition'>setBlendAlpha</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-356"></a><span class='hs-definition'>setBlendAlpha</span> <span class='hs-varid'>state</span>
<a name="line-357"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>state</span>
<a name="line-358"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>blend</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Enabled</span>
<a name="line-359"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>blendFunc</span> <span class='hs-varop'>$=</span> <span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>SrcAlpha</span><span class='hs-layout'>,</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>OneMinusSrcAlpha</span><span class='hs-layout'>)</span>
<a name="line-360"></a>
<a name="line-361"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>
<a name="line-362"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>blend</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Disabled</span>
<a name="line-363"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>blendFunc</span> <span class='hs-varop'>$=</span> <span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>One</span><span class='hs-layout'>,</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Zero</span><span class='hs-layout'>)</span>
<a name="line-364"></a>
<a name="line-365"></a><a name="setLineSmooth"></a><span class='hs-comment'>-- | Turn line smoothing on or off</span>
<a name="line-366"></a><span class='hs-definition'>setLineSmooth</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-367"></a><span class='hs-definition'>setLineSmooth</span> <span class='hs-varid'>state</span>
<a name="line-368"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>state</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>lineSmooth</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Enabled</span>
<a name="line-369"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>lineSmooth</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Disabled</span>
<a name="line-370"></a>
<a name="line-371"></a>
<a name="line-372"></a><a name="vertexPFs"></a><span class='hs-definition'>vertexPFs</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Float</span><span class='hs-layout'>,</span> <span class='hs-conid'>Float</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-373"></a><span class='hs-comment'>{-# INLINE vertexPFs #-}</span>
<a name="line-374"></a><span class='hs-definition'>vertexPFs</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-375"></a><span class='hs-definition'>vertexPFs</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>rest</span><span class='hs-layout'>)</span>
<a name="line-376"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>vertex</span> <span class='hs-varop'>$</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Vertex2</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>gf</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-377"></a> <span class='hs-varid'>vertexPFs</span> <span class='hs-varid'>rest</span>
<a name="line-378"></a>
<a name="line-379"></a>
<a name="line-380"></a>
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