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<title>Graphics/Rendering/OpenGL/GL/Exception.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.Exception</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 to compensate for differences between</span>
<a name="line-13"></a><span class='hs-comment'>-- Haskell implementations.</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'>Exception</span> <span class='hs-layout'>(</span>
<a name="line-18"></a> <span class='hs-varid'>bracket</span><span class='hs-layout'>,</span> <span class='hs-varid'>bracket_</span><span class='hs-layout'>,</span> <span class='hs-varid'>unsafeBracket_</span><span class='hs-layout'>,</span> <span class='hs-varid'>finallyRet</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'>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>
<a name="line-22"></a>
<a name="line-23"></a><span class='hs-cpp'>#ifdef __NHC__</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span> <span class='hs-varid'>bracket</span><span class='hs-layout'>,</span> <span class='hs-varid'>bracket_</span> <span class='hs-layout'>)</span>
<a name="line-25"></a>
<a name="line-26"></a><a name="bracket"></a><span class='hs-comment'>{-# INLINE bracket #-}</span>
<a name="line-27"></a><span class='hs-definition'>bracket</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-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>c</span>
<a name="line-28"></a><span class='hs-definition'>bracket</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-varid'>bracket</span>
<a name="line-29"></a>
<a name="line-30"></a><a name="bracket_"></a><span class='hs-comment'>{-# INLINE bracket_ #-}</span>
<a name="line-31"></a><span class='hs-definition'>bracket_</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'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>c</span>
<a name="line-32"></a><span class='hs-definition'>bracket_</span> <span class='hs-varid'>before</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-varid'>bracket_</span> <span class='hs-varid'>before</span> <span class='hs-varop'>.</span> <span class='hs-varid'>const</span>
<a name="line-33"></a>
<a name="line-34"></a><a name="finally"></a><span class='hs-definition'>finally</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'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span>
<a name="line-35"></a><span class='hs-definition'>finally</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>flip</span> <span class='hs-varop'>.</span> <span class='hs-varid'>bracket_</span> <span class='hs-varop'>.</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>undefined</span>
<a name="line-36"></a><span class='hs-cpp'>#else</span>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</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> <span class='hs-varid'>bracket_</span><span class='hs-layout'>,</span> <span class='hs-varid'>finally</span> <span class='hs-layout'>)</span>
<a name="line-38"></a><span class='hs-cpp'>#endif</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="unsafeBracket_"></a><span class='hs-comment'>{-# INLINE unsafeBracket_ #-}</span>
<a name="line-41"></a><span class='hs-definition'>unsafeBracket_</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'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>c</span>
<a name="line-42"></a><span class='hs-definition'>unsafeBracket_</span> <span class='hs-varid'>before</span> <span class='hs-varid'>after</span> <span class='hs-varid'>thing</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-43"></a> <span class='hs-varid'>before</span>
<a name="line-44"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>thing</span>
<a name="line-45"></a> <span class='hs-varid'>after</span>
<a name="line-46"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>r</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="finallyRet"></a><span class='hs-comment'>{-# INLINE finallyRet #-}</span>
<a name="line-49"></a><span class='hs-definition'>finallyRet</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'>b</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-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-50"></a><a name="finallyRet"></a><span class='hs-definition'>a</span> <span class='hs-varop'>`finallyRet`</span> <span class='hs-varid'>sequel</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-51"></a> <span class='hs-varid'>r2Ref</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-varid'>undefined</span>
<a name="line-52"></a> <span class='hs-varid'>r1</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>a</span> <span class='hs-varop'>`finally`</span> <span class='hs-layout'>(</span><span class='hs-varid'>sequel</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>r2Ref</span><span class='hs-layout'>)</span>
<a name="line-53"></a> <span class='hs-varid'>r2</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>r2Ref</span>
<a name="line-54"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>r1</span><span class='hs-layout'>,</span> <span class='hs-varid'>r2</span><span class='hs-layout'>)</span>
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