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<title>Graphics/UI/GLUT/Raw/APIEntry.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE ForeignFunctionInterface, CPP #-}</span>
<a name="line-2"></a><span class='hs-comment'>-- #hide</span>
<a name="line-3"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-4"></a><span class='hs-comment'>-- |</span>
<a name="line-5"></a><span class='hs-comment'>-- Module : Graphics.UI.GLUT.Raw.APIEntry</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (c) Sven Panne 2002-2009</span>
<a name="line-7"></a><span class='hs-comment'>-- License : BSD-style (see the file LICENSE)</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- Maintainer : sven.panne@aedion.de</span>
<a name="line-10"></a><span class='hs-comment'>-- Stability : provisional</span>
<a name="line-11"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- This is a purely internal module for handling an OpenGL-like extension</span>
<a name="line-14"></a><span class='hs-comment'>-- mechanism for GLUT.</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>module</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-varop'>.</span><span class='hs-conid'>Raw</span><span class='hs-varop'>.</span><span class='hs-conid'>APIEntry</span> <span class='hs-layout'>(</span>
<a name="line-19"></a> <span class='hs-conid'>Invoker</span><span class='hs-layout'>,</span> <span class='hs-varid'>getAPIEntry</span><span class='hs-layout'>,</span> <span class='hs-varid'>getAPIEntryInternal</span><span class='hs-layout'>,</span>
<a name="line-20"></a> <span class='hs-conid'>FunPtr</span><span class='hs-layout'>,</span> <span class='hs-varid'>unsafePerformIO</span>
<a name="line-21"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-22"></a>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>C</span><span class='hs-varop'>.</span><span class='hs-conid'>String</span>
<a name="line-24"></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'>Error</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Ptr</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span>
<a name="line-27"></a>
<a name="line-28"></a><span class='hs-cpp'>#ifdef __HUGS__</span>
<a name="line-29"></a><span class='hs-comment'>{-# CFILES cbits/HsGLUT.c #-}</span>
<a name="line-30"></a><span class='hs-cpp'>#endif</span>
<a name="line-31"></a>
<a name="line-32"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-33"></a>
<a name="line-34"></a><a name="Invoker"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Invoker</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FunPtr</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="getAPIEntry"></a><span class='hs-comment'>-- | Retrieve a GLUT API entry by name. Throws a userError when no entry with</span>
<a name="line-37"></a><span class='hs-comment'>-- the given name was found.</span>
<a name="line-38"></a><span class='hs-definition'>getAPIEntry</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-layout'>(</span><span class='hs-conid'>FunPtr</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-39"></a><span class='hs-definition'>getAPIEntry</span> <span class='hs-varid'>extensionEntry</span> <span class='hs-keyglyph'>=</span>
<a name="line-40"></a> <span class='hs-varid'>throwIfNullFunPtr</span> <span class='hs-layout'>(</span><span class='hs-str'>"unknown GLUT entry "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>extensionEntry</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-41"></a> <span class='hs-varid'>getAPIEntryInternal</span> <span class='hs-varid'>extensionEntry</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="throwIfNullFunPtr"></a><span class='hs-definition'>throwIfNullFunPtr</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-layout'>(</span><span class='hs-conid'>FunPtr</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-layout'>(</span><span class='hs-conid'>FunPtr</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-44"></a><span class='hs-definition'>throwIfNullFunPtr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>throwIf</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span> <span class='hs-varid'>nullFunPtr</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>const</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="getAPIEntryInternal"></a><span class='hs-definition'>getAPIEntryInternal</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-layout'>(</span><span class='hs-conid'>FunPtr</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-47"></a><span class='hs-definition'>getAPIEntryInternal</span> <span class='hs-varid'>extensionEntry</span> <span class='hs-keyglyph'>=</span>
<a name="line-48"></a> <span class='hs-varid'>withCString</span> <span class='hs-varid'>extensionEntry</span> <span class='hs-varid'>hs_GLUT_getProcAddress</span>
<a name="line-49"></a>
<a name="line-50"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-keyword'>ccall</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"hs_GLUT_getProcAddress"</span>
<a name="line-51"></a> <span class='hs-varid'>hs_GLUT_getProcAddress</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CString</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-varid'>a</span><span class='hs-layout'>)</span>
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