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<title>Graphics/UI/GLUT/Begin.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : Graphics.UI.GLUT.Begin</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Sven Panne 2002-2005</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD-style (see the file libraries/GLUT/LICENSE)</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : sven.panne@aedion.de</span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : stable</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- After a GLUT program has done initial setup such as creating windows and</span>
<a name="line-12"></a><span class='hs-comment'>-- menus, GLUT programs enter the GLUT event processing loop by calling</span>
<a name="line-13"></a><span class='hs-comment'>-- 'mainLoop' or handle events iteratively with 'mainLoopEvent'.</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'>UI</span><span class='hs-varop'>.</span><span class='hs-conid'>GLUT</span><span class='hs-varop'>.</span><span class='hs-conid'>Begin</span> <span class='hs-layout'>(</span>
<a name="line-18"></a> <span class='hs-comment'>-- * Handling events</span>
<a name="line-19"></a> <span class='hs-varid'>mainLoop</span><span class='hs-layout'>,</span> <span class='hs-varid'>mainLoopEvent</span><span class='hs-layout'>,</span> <span class='hs-varid'>leaveMainLoop</span><span class='hs-layout'>,</span>
<a name="line-20"></a>
<a name="line-21"></a> <span class='hs-comment'>-- * Controlling the behaviour when windows are closed</span>
<a name="line-22"></a> <span class='hs-conid'>ActionOnWindowClose</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'>actionOnWindowClose</span>
<a name="line-23"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-24"></a>
<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'>C</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span> <span class='hs-layout'>(</span> <span class='hs-conid'>CInt</span> <span class='hs-layout'>)</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>OpenGL</span><span class='hs-varop'>.</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>StateVar</span> <span class='hs-layout'>(</span> <span class='hs-conid'>StateVar</span><span class='hs-layout'>,</span> <span class='hs-varid'>makeStateVar</span> <span class='hs-layout'>)</span>
<a name="line-27"></a><span class='hs-keyword'>import</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'>Constants</span> <span class='hs-layout'>(</span>
<a name="line-28"></a> <span class='hs-varid'>glut_ACTION_ON_WINDOW_CLOSE</span><span class='hs-layout'>,</span> <span class='hs-varid'>glut_ACTION_EXIT</span><span class='hs-layout'>,</span>
<a name="line-29"></a> <span class='hs-varid'>glut_ACTION_GLUTMAINLOOP_RETURNS</span><span class='hs-layout'>,</span> <span class='hs-varid'>glut_ACTION_CONTINUE_EXECUTION</span> <span class='hs-layout'>)</span>
<a name="line-30"></a><span class='hs-keyword'>import</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'>QueryUtils</span> <span class='hs-layout'>(</span> <span class='hs-varid'>simpleGet</span><span class='hs-layout'>,</span> <span class='hs-varid'>glutSetOption</span> <span class='hs-layout'>)</span>
<a name="line-31"></a><span class='hs-keyword'>import</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'>Extensions</span>
<a name="line-32"></a>
<a name="line-33"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-34"></a>
<a name="line-35"></a><span class='hs-cpp'>#include "HsGLUTExt.h"</span>
<a name="line-36"></a>
<a name="line-37"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-38"></a>
<a name="line-39"></a><span class='hs-comment'>-- | Enter the GLUT event processing loop; it will call as necessary any</span>
<a name="line-40"></a><span class='hs-comment'>-- callbacks that have been registered. This routine should be called at most</span>
<a name="line-41"></a><span class='hs-comment'>-- once in a GLUT program.</span>
<a name="line-42"></a>
<a name="line-43"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>safe</span> <span class='hs-str'>"glutMainLoop"</span> <span class='hs-varid'>mainLoop</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-44"></a>
<a name="line-45"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-46"></a>
<a name="line-47"></a><span class='hs-comment'>-- | (/freeglut only/) Process one iteration's worth of events in its event loop.</span>
<a name="line-48"></a><span class='hs-comment'>-- This allows the application to control its own event loop and still use the</span>
<a name="line-49"></a><span class='hs-comment'>-- GLUT package.</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="mainLoopEvent"></a><span class='hs-definition'>mainLoopEvent</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-52"></a><span class='hs-definition'>mainLoopEvent</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>glutMainLoopEvent</span>
<a name="line-53"></a>
<a name="line-54"></a><span class='hs-conid'>EXTENSION_ENTRY</span><span class='hs-layout'>(</span><span class='hs-keyword'>safe</span><span class='hs-layout'>,</span><span class='hs-str'>"freeglut"</span><span class='hs-layout'>,</span><span class='hs-varid'>glutMainLoopEvent</span><span class='hs-layout'>,</span><span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-55"></a>
<a name="line-56"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-57"></a>
<a name="line-58"></a><span class='hs-comment'>-- | (/freeglut only/) Stop the event loop. If 'actionOnWindowClose' contains</span>
<a name="line-59"></a><span class='hs-comment'>-- 'Exit', the application will exit; otherwise control will return to the</span>
<a name="line-60"></a><span class='hs-comment'>-- function which called 'mainLoop'.</span>
<a name="line-61"></a><span class='hs-comment'>--</span>
<a name="line-62"></a><span class='hs-comment'>-- If the application has two nested calls to 'mainLoop' and calls</span>
<a name="line-63"></a><span class='hs-comment'>-- 'leaveMainLoop', the behaviour is undefined. It may leave only the inner</span>
<a name="line-64"></a><span class='hs-comment'>-- nested loop or it may leave both loops. If the reader has a strong preference</span>
<a name="line-65"></a><span class='hs-comment'>-- for one behaviour over the other he should contact the freeglut Programming</span>
<a name="line-66"></a><span class='hs-comment'>-- Consortium and ask for the code to be fixed.</span>
<a name="line-67"></a>
<a name="line-68"></a><a name="leaveMainLoop"></a><span class='hs-definition'>leaveMainLoop</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-69"></a><span class='hs-definition'>leaveMainLoop</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>glutLeaveMainLoop</span>
<a name="line-70"></a>
<a name="line-71"></a><span class='hs-conid'>EXTENSION_ENTRY</span><span class='hs-layout'>(</span><span class='hs-keyword'>safe</span><span class='hs-layout'>,</span><span class='hs-str'>"freeglut"</span><span class='hs-layout'>,</span><span class='hs-varid'>glutLeaveMainLoop</span><span class='hs-layout'>,</span><span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-72"></a>
<a name="line-73"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-74"></a>
<a name="line-75"></a><span class='hs-comment'>-- | The behaviour when the user closes a window.</span>
<a name="line-76"></a>
<a name="line-77"></a><a name="ActionOnWindowClose"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ActionOnWindowClose</span>
<a name="line-78"></a> <span class='hs-keyglyph'>=</span> <span class='hs-comment'>-- | Exit the whole program when any window is closed or 'leaveMainLoop'</span>
<a name="line-79"></a> <span class='hs-comment'>-- is called (default).</span>
<a name="line-80"></a> <span class='hs-conid'>Exit</span>
<a name="line-81"></a> <span class='hs-keyglyph'>|</span> <span class='hs-comment'>-- | Return from mainLoop when any window is closed.</span>
<a name="line-82"></a> <span class='hs-conid'>MainLoopReturns</span>
<a name="line-83"></a> <span class='hs-keyglyph'>|</span> <span class='hs-comment'>-- | Return from mainLoop after the last window is closed.</span>
<a name="line-84"></a> <span class='hs-conid'>ContinueExectuion</span>
<a name="line-85"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ord</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-layout'>)</span>
<a name="line-86"></a>
<a name="line-87"></a><a name="marshalActionOnWindowClose"></a><span class='hs-definition'>marshalActionOnWindowClose</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ActionOnWindowClose</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CInt</span>
<a name="line-88"></a><span class='hs-definition'>marshalActionOnWindowClose</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-89"></a> <span class='hs-conid'>Exit</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>glut_ACTION_EXIT</span>
<a name="line-90"></a> <span class='hs-conid'>MainLoopReturns</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>glut_ACTION_GLUTMAINLOOP_RETURNS</span>
<a name="line-91"></a> <span class='hs-conid'>ContinueExectuion</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>glut_ACTION_CONTINUE_EXECUTION</span>
<a name="line-92"></a>
<a name="line-93"></a><a name="unmarshalActionOnWindowClose"></a><span class='hs-definition'>unmarshalActionOnWindowClose</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ActionOnWindowClose</span>
<a name="line-94"></a><span class='hs-definition'>unmarshalActionOnWindowClose</span> <span class='hs-varid'>x</span>
<a name="line-95"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>glut_ACTION_EXIT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Exit</span>
<a name="line-96"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>glut_ACTION_GLUTMAINLOOP_RETURNS</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>MainLoopReturns</span>
<a name="line-97"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>glut_ACTION_CONTINUE_EXECUTION</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ContinueExectuion</span>
<a name="line-98"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-layout'>(</span><span class='hs-str'>"unmarshalActionOnWindowClose: illegal value "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-99"></a>
<a name="line-100"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-101"></a>
<a name="line-102"></a><span class='hs-comment'>-- | (/freeglut only/) Controls the behaviour when the user closes a window.</span>
<a name="line-103"></a>
<a name="line-104"></a><a name="actionOnWindowClose"></a><span class='hs-definition'>actionOnWindowClose</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>StateVar</span> <span class='hs-conid'>ActionOnWindowClose</span>
<a name="line-105"></a><span class='hs-definition'>actionOnWindowClose</span> <span class='hs-keyglyph'>=</span>
<a name="line-106"></a> <span class='hs-varid'>makeStateVar</span>
<a name="line-107"></a> <span class='hs-layout'>(</span><span class='hs-varid'>simpleGet</span> <span class='hs-varid'>unmarshalActionOnWindowClose</span> <span class='hs-varid'>glut_ACTION_ON_WINDOW_CLOSE</span><span class='hs-layout'>)</span>
<a name="line-108"></a> <span class='hs-layout'>(</span><span class='hs-varid'>glutSetOption</span> <span class='hs-varid'>glut_ACTION_ON_WINDOW_CLOSE</span> <span class='hs-varop'>.</span> <span class='hs-varid'>marshalActionOnWindowClose</span><span class='hs-layout'>)</span>
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