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<title>Graphics/Rendering/OpenGL/GL/StateVar.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.Rendering.OpenGL.GL.StateVar</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Sven Panne 2002-2009</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD-style (see the file libraries/OpenGL/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'>--------------------------------------------------------------------------------</span>
<a name="line-12"></a>
<a name="line-13"></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'>StateVar</span> <span class='hs-layout'>(</span>
<a name="line-14"></a> <span class='hs-conid'>HasGetter</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-15"></a> <span class='hs-conid'>GettableStateVar</span><span class='hs-layout'>,</span> <span class='hs-varid'>makeGettableStateVar</span><span class='hs-layout'>,</span>
<a name="line-16"></a> <span class='hs-conid'>HasSetter</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'>set</span><span class='hs-layout'>,</span>
<a name="line-17"></a> <span class='hs-conid'>SettableStateVar</span><span class='hs-layout'>,</span> <span class='hs-varid'>makeSettableStateVar</span><span class='hs-layout'>,</span>
<a name="line-18"></a> <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-19"></a> <span class='hs-layout'>(</span><span class='hs-varop'>$~</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>$=!</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>$~!</span><span class='hs-layout'>)</span>
<a name="line-20"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <span class='hs-layout'>(</span> <span class='hs-conid'>IORef</span><span class='hs-layout'>,</span> <span class='hs-varid'>readIORef</span><span class='hs-layout'>,</span> <span class='hs-varid'>writeIORef</span> <span class='hs-layout'>)</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-25"></a>
<a name="line-26"></a><span class='hs-keyword'>infixr</span> <span class='hs-num'>2</span> <span class='hs-varop'>$=</span>
<a name="line-27"></a>
<a name="line-28"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-29"></a>
<a name="line-30"></a><a name="HasGetter"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>HasGetter</span> <span class='hs-varid'>g</span> <span class='hs-keyword'>where</span>
<a name="line-31"></a> <span class='hs-varid'>get</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>g</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</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><a name="GettableStateVar"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-layout'>(</span><span class='hs-conid'>IO</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-36"></a>
<a name="line-37"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>HasGetter</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-keyword'>where</span>
<a name="line-38"></a> <span class='hs-varid'>get</span> <span class='hs-layout'>(</span><span class='hs-conid'>GettableStateVar</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>g</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="makeGettableStateVar"></a><span class='hs-definition'>makeGettableStateVar</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'>GettableStateVar</span> <span class='hs-varid'>a</span>
<a name="line-41"></a><span class='hs-definition'>makeGettableStateVar</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>GettableStateVar</span>
<a name="line-42"></a>
<a name="line-43"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-44"></a>
<a name="line-45"></a><a name="HasSetter"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>HasSetter</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>where</span>
<a name="line-46"></a> <span class='hs-layout'>(</span><span class='hs-varop'>$=</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="set"></a><span class='hs-comment'>{-# DEPRECATED set "use `sequence_' instead" #-}</span>
<a name="line-49"></a><span class='hs-definition'>set</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-50"></a><span class='hs-definition'>set</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sequence_</span>
<a name="line-51"></a>
<a name="line-52"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-53"></a>
<a name="line-54"></a><a name="SettableStateVar"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>SettableStateVar</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SettableStateVar</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-55"></a>
<a name="line-56"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>HasSetter</span> <span class='hs-conid'>SettableStateVar</span> <span class='hs-keyword'>where</span>
<a name="line-57"></a> <span class='hs-layout'>(</span><span class='hs-varop'>$=</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>SettableStateVar</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span>
<a name="line-58"></a>
<a name="line-59"></a><a name="$=!"></a><span class='hs-comment'>-- | A strict variant of '$='.</span>
<a name="line-60"></a><span class='hs-layout'>(</span><span class='hs-varop'>$=!</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HasSetter</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-61"></a><a name="v"></a><span class='hs-definition'>v</span> <span class='hs-varop'>$=!</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>`seq`</span> <span class='hs-varid'>v</span> <span class='hs-varop'>$=</span> <span class='hs-varid'>x</span>
<a name="line-62"></a>
<a name="line-63"></a><a name="makeSettableStateVar"></a><span class='hs-definition'>makeSettableStateVar</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-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SettableStateVar</span> <span class='hs-varid'>a</span>
<a name="line-64"></a><span class='hs-definition'>makeSettableStateVar</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SettableStateVar</span>
<a name="line-65"></a>
<a name="line-66"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-67"></a>
<a name="line-68"></a><a name="StateVar"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>StateVar</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span>
<a name="line-69"></a> <span class='hs-conid'>StateVar</span> <span class='hs-layout'>(</span><span class='hs-conid'>GettableStateVar</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>SettableStateVar</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-70"></a>
<a name="line-71"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>HasGetter</span> <span class='hs-conid'>StateVar</span> <span class='hs-keyword'>where</span>
<a name="line-72"></a> <span class='hs-varid'>get</span> <span class='hs-layout'>(</span><span class='hs-conid'>StateVar</span> <span class='hs-varid'>g</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>get</span> <span class='hs-varid'>g</span>
<a name="line-73"></a>
<a name="line-74"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>HasSetter</span> <span class='hs-conid'>StateVar</span> <span class='hs-keyword'>where</span>
<a name="line-75"></a> <span class='hs-layout'>(</span><span class='hs-varop'>$=</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>StateVar</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$=</span> <span class='hs-varid'>a</span>
<a name="line-76"></a>
<a name="line-77"></a><a name="makeStateVar"></a><span class='hs-definition'>makeStateVar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StateVar</span> <span class='hs-varid'>a</span>
<a name="line-78"></a><span class='hs-definition'>makeStateVar</span> <span class='hs-varid'>g</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StateVar</span> <span class='hs-layout'>(</span><span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>makeSettableStateVar</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-79"></a>
<a name="line-80"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-81"></a>
<a name="line-82"></a><span class='hs-comment'>-- | A modificator convenience function.</span>
<a name="line-83"></a>
<a name="line-84"></a><a name="$~"></a><span class='hs-layout'>(</span><span class='hs-varop'>$~</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>HasGetter</span> <span class='hs-varid'>v</span><span class='hs-layout'>,</span> <span class='hs-conid'>HasSetter</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>v</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-85"></a><span class='hs-definition'>v</span> <span class='hs-varop'>$~</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-86"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>get</span> <span class='hs-varid'>v</span>
<a name="line-87"></a> <span class='hs-varid'>v</span> <span class='hs-varop'>$=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span>
<a name="line-88"></a>
<a name="line-89"></a><a name="$~!"></a><span class='hs-comment'>-- | A strict variant of '$~'.</span>
<a name="line-90"></a><span class='hs-layout'>(</span><span class='hs-varop'>$~!</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>HasGetter</span> <span class='hs-varid'>v</span><span class='hs-layout'>,</span> <span class='hs-conid'>HasSetter</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>v</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-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-91"></a><span class='hs-definition'>v</span> <span class='hs-varop'>$~!</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-92"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>get</span> <span class='hs-varid'>v</span>
<a name="line-93"></a> <span class='hs-varid'>v</span> <span class='hs-varop'>$=!</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span>
<a name="line-94"></a>
<a name="line-95"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-96"></a>
<a name="line-97"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>HasGetter</span> <span class='hs-conid'>IORef</span> <span class='hs-keyword'>where</span>
<a name="line-98"></a> <span class='hs-varid'>get</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>readIORef</span>
<a name="line-99"></a>
<a name="line-100"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>HasSetter</span> <span class='hs-conid'>IORef</span> <span class='hs-keyword'>where</span>
<a name="line-101"></a> <span class='hs-layout'>(</span><span class='hs-varop'>$=</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeIORef</span>
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