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<title>Graphics/Rendering/OpenGL/GL/IOState.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-- #hide</span>
<a name="line-2"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : Graphics.Rendering.OpenGL.GL.IOState</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) Sven Panne 2002-2009</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD-style (see the file libraries/OpenGL/LICENSE)</span>
<a name="line-7"></a><span class='hs-comment'>-- </span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer : sven.panne@aedion.de</span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : stable</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- This is a purely internal module for an IO monad with a pointer as an</span>
<a name="line-13"></a><span class='hs-comment'>-- additional state, basically a /StateT (Ptr s) IO a/.</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-16"></a>
<a name="line-17"></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'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>IOState</span> <span class='hs-layout'>(</span>
<a name="line-18"></a> <span class='hs-conid'>IOState</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'>getIOState</span><span class='hs-layout'>,</span> <span class='hs-varid'>peekIOState</span><span class='hs-layout'>,</span> <span class='hs-varid'>evalIOState</span><span class='hs-layout'>,</span> <span class='hs-varid'>nTimes</span>
<a name="line-19"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-20"></a>
<a name="line-21"></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'>plusPtr</span> <span class='hs-layout'>)</span>
<a name="line-22"></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-varid'>sizeOf</span><span class='hs-layout'>,</span><span class='hs-varid'>peek</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-25"></a>
<a name="line-26"></a><a name="IOState"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>IOState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IOState</span> <span class='hs-layout'>{</span> <span class='hs-varid'>runIOState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ptr</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ptr</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-27"></a>
<a name="line-28"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-layout'>(</span><span class='hs-conid'>IOState</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-29"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IOState</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runIOState</span> <span class='hs-varid'>m</span> <span class='hs-varid'>s</span> <span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-30"></a>
<a name="line-31"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-conid'>IOState</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-32"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IOState</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-33"></a> <span class='hs-varid'>m</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IOState</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runIOState</span> <span class='hs-varid'>m</span> <span class='hs-varid'>s</span> <span class='hs-layout'>;</span> <span class='hs-varid'>runIOState</span> <span class='hs-layout'>(</span><span class='hs-varid'>k</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-34"></a> <span class='hs-varid'>fail</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IOState</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-varid'>str</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="getIOState"></a><span class='hs-definition'>getIOState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IOState</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>Ptr</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-37"></a><span class='hs-definition'>getIOState</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IOState</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="putIOState"></a><span class='hs-definition'>putIOState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ptr</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IOState</span> <span class='hs-varid'>s</span> <span class='hs-conid'>()</span>
<a name="line-40"></a><span class='hs-definition'>putIOState</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IOState</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>()</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-41"></a>
<a name="line-42"></a><a name="peekIOState"></a><span class='hs-definition'>peekIOState</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-conid'>IOState</span> <span class='hs-varid'>a</span> <span class='hs-varid'>a</span>
<a name="line-43"></a><span class='hs-definition'>peekIOState</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-44"></a> <span class='hs-varid'>ptr</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getIOState</span>
<a name="line-45"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>liftIOState</span> <span class='hs-varop'>$</span> <span class='hs-varid'>peek</span> <span class='hs-varid'>ptr</span>
<a name="line-46"></a> <span class='hs-varid'>putIOState</span> <span class='hs-layout'>(</span><span class='hs-varid'>ptr</span> <span class='hs-varop'>`plusPtr`</span> <span class='hs-varid'>sizeOf</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-47"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="liftIOState"></a><span class='hs-definition'>liftIOState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IOState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span>
<a name="line-50"></a><span class='hs-definition'>liftIOState</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IOState</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>m</span> <span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="evalIOState"></a><span class='hs-definition'>evalIOState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IOState</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-53"></a><span class='hs-definition'>evalIOState</span> <span class='hs-varid'>m</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runIOState</span> <span class='hs-varid'>m</span> <span class='hs-varid'>s</span> <span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-varid'>a</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="nTimes"></a><span class='hs-definition'>nTimes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integral</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'>IOState</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IOState</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span>
<a name="line-56"></a><span class='hs-definition'>nTimes</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sequence</span> <span class='hs-varop'>.</span> <span class='hs-varid'>replicate</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
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