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<title>Graphics/UI/GLUT/State.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.State</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'>-- GLUT maintains a considerable amount of programmer visible state. Some (but</span>
<a name="line-12"></a><span class='hs-comment'>-- not all) of this state may be directly retrieved.</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-15"></a>
<a name="line-16"></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'>State</span> <span class='hs-layout'>(</span>
<a name="line-17"></a> <span class='hs-comment'>-- * State of all windows</span>
<a name="line-18"></a> <span class='hs-varid'>windowBorderWidth</span><span class='hs-layout'>,</span> <span class='hs-varid'>windowHeaderHeight</span><span class='hs-layout'>,</span>
<a name="line-19"></a>
<a name="line-20"></a> <span class='hs-comment'>-- * State of the /current window/</span>
<a name="line-21"></a> <span class='hs-varid'>rgba</span><span class='hs-layout'>,</span>
<a name="line-22"></a> <span class='hs-conid'>BufferDepth</span><span class='hs-layout'>,</span> <span class='hs-varid'>rgbaBufferDepths</span><span class='hs-layout'>,</span> <span class='hs-varid'>colorBufferDepth</span><span class='hs-layout'>,</span>
<a name="line-23"></a> <span class='hs-varid'>doubleBuffered</span><span class='hs-layout'>,</span> <span class='hs-varid'>stereo</span><span class='hs-layout'>,</span>
<a name="line-24"></a> <span class='hs-varid'>accumBufferDepths</span><span class='hs-layout'>,</span> <span class='hs-varid'>depthBufferDepth</span><span class='hs-layout'>,</span> <span class='hs-varid'>stencilBufferDepth</span><span class='hs-layout'>,</span>
<a name="line-25"></a> <span class='hs-conid'>SampleCount</span><span class='hs-layout'>,</span> <span class='hs-varid'>sampleCount</span><span class='hs-layout'>,</span> <span class='hs-varid'>formatID</span><span class='hs-layout'>,</span>
<a name="line-26"></a> <span class='hs-varid'>fullScreenMode</span><span class='hs-layout'>,</span>
<a name="line-27"></a>
<a name="line-28"></a> <span class='hs-comment'>-- * GLUT state pertaining to the layers of the /current window/</span>
<a name="line-29"></a> <span class='hs-varid'>damaged</span><span class='hs-layout'>,</span>
<a name="line-30"></a>
<a name="line-31"></a> <span class='hs-comment'>-- * Timing</span>
<a name="line-32"></a> <span class='hs-varid'>elapsedTime</span><span class='hs-layout'>,</span>
<a name="line-33"></a>
<a name="line-34"></a> <span class='hs-comment'>-- * Device information</span>
<a name="line-35"></a>
<a name="line-36"></a> <span class='hs-comment'>-- $DeviceInformation</span>
<a name="line-37"></a> <span class='hs-varid'>screenSize</span><span class='hs-layout'>,</span> <span class='hs-varid'>screenSizeMM</span><span class='hs-layout'>,</span>
<a name="line-38"></a> <span class='hs-varid'>hasKeyboard</span><span class='hs-layout'>,</span>
<a name="line-39"></a> <span class='hs-conid'>ButtonCount</span><span class='hs-layout'>,</span> <span class='hs-varid'>numMouseButtons</span><span class='hs-layout'>,</span>
<a name="line-40"></a> <span class='hs-varid'>numSpaceballButtons</span><span class='hs-layout'>,</span>
<a name="line-41"></a> <span class='hs-conid'>DialCount</span><span class='hs-layout'>,</span> <span class='hs-varid'>numDialsAndButtons</span><span class='hs-layout'>,</span>
<a name="line-42"></a> <span class='hs-varid'>numTabletButtons</span><span class='hs-layout'>,</span>
<a name="line-43"></a> <span class='hs-conid'>AxisCount</span><span class='hs-layout'>,</span> <span class='hs-conid'>PollRate</span><span class='hs-layout'>,</span> <span class='hs-varid'>joystickInfo</span><span class='hs-layout'>,</span>
<a name="line-44"></a> <span class='hs-varid'>supportedNumAuxBuffers</span><span class='hs-layout'>,</span> <span class='hs-varid'>supportedSamplesPerPixel</span><span class='hs-layout'>,</span>
<a name="line-45"></a>
<a name="line-46"></a> <span class='hs-comment'>-- * GLUT information</span>
<a name="line-47"></a> <span class='hs-varid'>glutVersion</span><span class='hs-layout'>,</span> <span class='hs-varid'>initState</span>
<a name="line-48"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-49"></a>
<a name="line-50"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-51"></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>
<a name="line-52"></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'>Alloc</span>
<a name="line-53"></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'>Array</span>
<a name="line-54"></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-55"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Storable</span>
<a name="line-56"></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-layout'>(</span> <span class='hs-conid'>GLenum</span><span class='hs-layout'>,</span> <span class='hs-conid'>Size</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-57"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>StateVar</span><span class='hs-layout'>,</span> <span class='hs-varid'>makeStateVar</span>
<a name="line-58"></a> <span class='hs-layout'>,</span> <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-59"></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'>Overlay</span>
<a name="line-60"></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>
<a name="line-61"></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'>Raw</span>
<a name="line-62"></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'>Window</span>
<a name="line-63"></a>
<a name="line-64"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-65"></a>
<a name="line-66"></a><span class='hs-comment'>-- | Contains 'True' when the current layer of the /current window/ is in RGBA</span>
<a name="line-67"></a><span class='hs-comment'>-- mode, 'False' means color index mode.</span>
<a name="line-68"></a>
<a name="line-69"></a><a name="rgba"></a><span class='hs-definition'>rgba</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>Bool</span>
<a name="line-70"></a><span class='hs-definition'>rgba</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeGettableStateVar</span><span class='hs-varop'>$</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>i2b</span> <span class='hs-varid'>glut_WINDOW_RGBA</span>
<a name="line-71"></a>
<a name="line-72"></a><span class='hs-comment'>-- | Bit depth of a buffer</span>
<a name="line-73"></a>
<a name="line-74"></a><a name="BufferDepth"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>BufferDepth</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Int</span>
<a name="line-75"></a>
<a name="line-76"></a><span class='hs-comment'>-- | Contains the number of red, green, blue, and alpha bits in the color buffer</span>
<a name="line-77"></a><span class='hs-comment'>-- of the /current window\'s/ current layer (0 in color index mode).</span>
<a name="line-78"></a>
<a name="line-79"></a><a name="rgbaBufferDepths"></a><span class='hs-definition'>rgbaBufferDepths</span> <span class='hs-keyglyph'>::</span>
<a name="line-80"></a> <span class='hs-conid'>GettableStateVar</span> <span class='hs-layout'>(</span><span class='hs-conid'>BufferDepth</span><span class='hs-layout'>,</span> <span class='hs-conid'>BufferDepth</span><span class='hs-layout'>,</span> <span class='hs-conid'>BufferDepth</span><span class='hs-layout'>,</span> <span class='hs-conid'>BufferDepth</span><span class='hs-layout'>)</span>
<a name="line-81"></a><span class='hs-definition'>rgbaBufferDepths</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-82"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_RED_SIZE</span>
<a name="line-83"></a> <span class='hs-varid'>g</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_GREEN_SIZE</span>
<a name="line-84"></a> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_BLUE_SIZE</span>
<a name="line-85"></a> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_ALPHA_SIZE</span>
<a name="line-86"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>g</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-87"></a>
<a name="line-88"></a><span class='hs-comment'>-- | Contains the total number of bits in the color buffer of the /current</span>
<a name="line-89"></a><span class='hs-comment'>-- window\'s/ current layer. For an RGBA layer, this is the sum of the red,</span>
<a name="line-90"></a><span class='hs-comment'>-- green, blue, and alpha bits. For an color index layer, this is the number</span>
<a name="line-91"></a><span class='hs-comment'>-- of bits of the color indexes.</span>
<a name="line-92"></a>
<a name="line-93"></a><a name="colorBufferDepth"></a><span class='hs-definition'>colorBufferDepth</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>BufferDepth</span>
<a name="line-94"></a><span class='hs-definition'>colorBufferDepth</span> <span class='hs-keyglyph'>=</span>
<a name="line-95"></a> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_BUFFER_SIZE</span>
<a name="line-96"></a>
<a name="line-97"></a><span class='hs-comment'>-- | Contains 'True' when the current layer of the /current window/ is double</span>
<a name="line-98"></a><span class='hs-comment'>-- buffered, 'False' otherwise.</span>
<a name="line-99"></a>
<a name="line-100"></a><a name="doubleBuffered"></a><span class='hs-definition'>doubleBuffered</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>Bool</span>
<a name="line-101"></a><span class='hs-definition'>doubleBuffered</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>i2b</span> <span class='hs-varid'>glut_WINDOW_DOUBLEBUFFER</span>
<a name="line-102"></a>
<a name="line-103"></a><span class='hs-comment'>-- | Contains 'True' when the current layer of the /current window/ is stereo,</span>
<a name="line-104"></a><span class='hs-comment'>-- 'False' otherwise.</span>
<a name="line-105"></a>
<a name="line-106"></a><a name="stereo"></a><span class='hs-definition'>stereo</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>Bool</span>
<a name="line-107"></a><span class='hs-definition'>stereo</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>i2b</span> <span class='hs-varid'>glut_WINDOW_STEREO</span>
<a name="line-108"></a>
<a name="line-109"></a><span class='hs-comment'>-- | Contains the number of red, green, blue, and alpha bits in the accumulation</span>
<a name="line-110"></a><span class='hs-comment'>-- buffer of the /current window\'s/ current layer (0 in color index mode).</span>
<a name="line-111"></a>
<a name="line-112"></a><a name="accumBufferDepths"></a><span class='hs-definition'>accumBufferDepths</span> <span class='hs-keyglyph'>::</span>
<a name="line-113"></a> <span class='hs-conid'>GettableStateVar</span> <span class='hs-layout'>(</span><span class='hs-conid'>BufferDepth</span><span class='hs-layout'>,</span> <span class='hs-conid'>BufferDepth</span><span class='hs-layout'>,</span> <span class='hs-conid'>BufferDepth</span><span class='hs-layout'>,</span> <span class='hs-conid'>BufferDepth</span><span class='hs-layout'>)</span>
<a name="line-114"></a><span class='hs-definition'>accumBufferDepths</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-115"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_ACCUM_RED_SIZE</span>
<a name="line-116"></a> <span class='hs-varid'>g</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_ACCUM_GREEN_SIZE</span>
<a name="line-117"></a> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_ACCUM_BLUE_SIZE</span>
<a name="line-118"></a> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_ACCUM_ALPHA_SIZE</span>
<a name="line-119"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>g</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-120"></a>
<a name="line-121"></a><span class='hs-comment'>-- | Contains the number of bits in the depth buffer of the /current window\'s/</span>
<a name="line-122"></a><span class='hs-comment'>-- current layer.</span>
<a name="line-123"></a>
<a name="line-124"></a><a name="depthBufferDepth"></a><span class='hs-definition'>depthBufferDepth</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>BufferDepth</span>
<a name="line-125"></a><span class='hs-definition'>depthBufferDepth</span> <span class='hs-keyglyph'>=</span>
<a name="line-126"></a> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_DEPTH_SIZE</span>
<a name="line-127"></a>
<a name="line-128"></a><span class='hs-comment'>-- | Contains the number of bits in the stencil buffer of the /current</span>
<a name="line-129"></a><span class='hs-comment'>-- window\'s/ current layer.</span>
<a name="line-130"></a>
<a name="line-131"></a><a name="stencilBufferDepth"></a><span class='hs-definition'>stencilBufferDepth</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>BufferDepth</span>
<a name="line-132"></a><span class='hs-definition'>stencilBufferDepth</span> <span class='hs-keyglyph'>=</span>
<a name="line-133"></a> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_STENCIL_SIZE</span>
<a name="line-134"></a>
<a name="line-135"></a><span class='hs-comment'>-- | Number of samples for multisampling</span>
<a name="line-136"></a>
<a name="line-137"></a><a name="SampleCount"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>SampleCount</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Int</span>
<a name="line-138"></a>
<a name="line-139"></a><span class='hs-comment'>-- | Contains the number of samples for multisampling for the /current window./</span>
<a name="line-140"></a>
<a name="line-141"></a><a name="sampleCount"></a><span class='hs-definition'>sampleCount</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>SampleCount</span>
<a name="line-142"></a><span class='hs-definition'>sampleCount</span> <span class='hs-keyglyph'>=</span>
<a name="line-143"></a> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_NUM_SAMPLES</span>
<a name="line-144"></a>
<a name="line-145"></a><span class='hs-comment'>-- | Contains the window system dependent format ID for the current layer of the</span>
<a name="line-146"></a><span class='hs-comment'>-- /current window/. On X11 GLUT implementations, this is the X visual ID. On</span>
<a name="line-147"></a><span class='hs-comment'>-- Win32 GLUT implementations, this is the Win32 Pixel Format Descriptor number.</span>
<a name="line-148"></a><span class='hs-comment'>-- This value is returned for debugging, benchmarking, and testing ease.</span>
<a name="line-149"></a>
<a name="line-150"></a><a name="formatID"></a><span class='hs-definition'>formatID</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>Int</span>
<a name="line-151"></a><span class='hs-definition'>formatID</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_FORMAT_ID</span>
<a name="line-152"></a>
<a name="line-153"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-154"></a>
<a name="line-155"></a><span class='hs-comment'>-- | (/freeglut only/) Contains 'True' if the /current window/ is in full screen</span>
<a name="line-156"></a><span class='hs-comment'>-- mode, 'False' otherwise.</span>
<a name="line-157"></a>
<a name="line-158"></a><a name="fullScreenMode"></a><span class='hs-definition'>fullScreenMode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>StateVar</span> <span class='hs-conid'>Bool</span>
<a name="line-159"></a><span class='hs-definition'>fullScreenMode</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeStateVar</span> <span class='hs-varid'>getFullScreenMode</span> <span class='hs-varid'>setFullScreenMode</span>
<a name="line-160"></a>
<a name="line-161"></a><a name="getFullScreenMode"></a><span class='hs-definition'>getFullScreenMode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Bool</span>
<a name="line-162"></a><span class='hs-definition'>getFullScreenMode</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>i2b</span> <span class='hs-varid'>glut_FULL_SCREEN</span>
<a name="line-163"></a>
<a name="line-164"></a><a name="setFullScreenMode"></a><span class='hs-definition'>setFullScreenMode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-165"></a><span class='hs-definition'>setFullScreenMode</span> <span class='hs-varid'>newMode</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-166"></a> <span class='hs-varid'>oldMode</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getFullScreenMode</span>
<a name="line-167"></a> <span class='hs-varid'>unless</span> <span class='hs-layout'>(</span><span class='hs-varid'>newMode</span> <span class='hs-varop'>==</span> <span class='hs-varid'>oldMode</span><span class='hs-layout'>)</span> <span class='hs-varid'>fullScreenToggle</span>
<a name="line-168"></a>
<a name="line-169"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-170"></a>
<a name="line-171"></a><span class='hs-comment'>-- | Contains the number of milliseconds since</span>
<a name="line-172"></a><span class='hs-comment'>-- 'Graphics.UI.GLUT.Initialization.initialize' was called.</span>
<a name="line-173"></a>
<a name="line-174"></a><a name="elapsedTime"></a><span class='hs-definition'>elapsedTime</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>Int</span>
<a name="line-175"></a><span class='hs-definition'>elapsedTime</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_ELAPSED_TIME</span>
<a name="line-176"></a>
<a name="line-177"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-178"></a>
<a name="line-179"></a><span class='hs-comment'>-- | Contains 'True' if the given plane of the /current window/ has been</span>
<a name="line-180"></a><span class='hs-comment'>-- damaged (by window system activity) since the last display callback was</span>
<a name="line-181"></a><span class='hs-comment'>-- triggered. Calling 'Graphics.UI.GLUT.Window.postRedisplay' or</span>
<a name="line-182"></a><span class='hs-comment'>-- 'Graphics.UI.GLUT.Overlay.postOverlayRedisplay' will not set this 'True'.</span>
<a name="line-183"></a>
<a name="line-184"></a><a name="damaged"></a><span class='hs-definition'>damaged</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Layer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>Bool</span>
<a name="line-185"></a><span class='hs-definition'>damaged</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-varid'>layerGet</span> <span class='hs-varid'>isDamaged</span> <span class='hs-layout'>(</span><span class='hs-varid'>marshalDamagedLayer</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span>
<a name="line-186"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>isDamaged</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>d</span> <span class='hs-varop'>/=</span> <span class='hs-num'>0</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>d</span> <span class='hs-varop'>/=</span> <span class='hs-comment'>-</span><span class='hs-num'>1</span>
<a name="line-187"></a> <span class='hs-varid'>marshalDamagedLayer</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-188"></a> <span class='hs-conid'>Normal</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>glut_NORMAL_DAMAGED</span>
<a name="line-189"></a> <span class='hs-conid'>Overlay</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>glut_OVERLAY_DAMAGED</span>
<a name="line-190"></a>
<a name="line-191"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-192"></a>
<a name="line-193"></a><span class='hs-comment'>-- $DeviceInformation</span>
<a name="line-194"></a><span class='hs-comment'>-- If a device is not available, the following state variables contain</span>
<a name="line-195"></a><span class='hs-comment'>-- 'Nothing', otherwise they return 'Just' the specific device information.</span>
<a name="line-196"></a><span class='hs-comment'>-- Only a screen is always assumed.</span>
<a name="line-197"></a>
<a name="line-198"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-199"></a>
<a name="line-200"></a><span class='hs-comment'>-- | The size of the screen in pixels.</span>
<a name="line-201"></a>
<a name="line-202"></a><a name="screenSize"></a><span class='hs-definition'>screenSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>Size</span>
<a name="line-203"></a><span class='hs-definition'>screenSize</span> <span class='hs-keyglyph'>=</span>
<a name="line-204"></a> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-205"></a> <span class='hs-varid'>wpx</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_SCREEN_WIDTH</span>
<a name="line-206"></a> <span class='hs-varid'>hpx</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_SCREEN_HEIGHT</span>
<a name="line-207"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Size</span> <span class='hs-varid'>wpx</span> <span class='hs-varid'>hpx</span>
<a name="line-208"></a>
<a name="line-209"></a><span class='hs-comment'>-- | The size of the screen in millimeters.</span>
<a name="line-210"></a>
<a name="line-211"></a><a name="screenSizeMM"></a><span class='hs-definition'>screenSizeMM</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>Size</span>
<a name="line-212"></a><span class='hs-definition'>screenSizeMM</span> <span class='hs-keyglyph'>=</span>
<a name="line-213"></a> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-214"></a> <span class='hs-varid'>wmm</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_SCREEN_WIDTH_MM</span>
<a name="line-215"></a> <span class='hs-varid'>hmm</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_SCREEN_HEIGHT_MM</span>
<a name="line-216"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Size</span> <span class='hs-varid'>wmm</span> <span class='hs-varid'>hmm</span>
<a name="line-217"></a>
<a name="line-218"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-219"></a>
<a name="line-220"></a><span class='hs-comment'>-- | Contains 'True' if a keyboard is present, 'False' otherwise.</span>
<a name="line-221"></a>
<a name="line-222"></a><a name="hasKeyboard"></a><span class='hs-definition'>hasKeyboard</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>Bool</span>
<a name="line-223"></a><span class='hs-definition'>hasKeyboard</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-varid'>deviceGet</span> <span class='hs-varid'>i2b</span> <span class='hs-varid'>glut_HAS_KEYBOARD</span>
<a name="line-224"></a>
<a name="line-225"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-226"></a>
<a name="line-227"></a><span class='hs-comment'>-- | Number of buttons of an input device</span>
<a name="line-228"></a>
<a name="line-229"></a><a name="ButtonCount"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>ButtonCount</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Int</span>
<a name="line-230"></a>
<a name="line-231"></a><span class='hs-comment'>-- | Contains 'Just' the number of buttons of an attached mouse or 'Nothing' if</span>
<a name="line-232"></a><span class='hs-comment'>-- there is none.</span>
<a name="line-233"></a>
<a name="line-234"></a><a name="numMouseButtons"></a><span class='hs-definition'>numMouseButtons</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>ButtonCount</span><span class='hs-layout'>)</span>
<a name="line-235"></a><span class='hs-definition'>numMouseButtons</span> <span class='hs-keyglyph'>=</span>
<a name="line-236"></a> <span class='hs-varid'>getDeviceInfo</span> <span class='hs-varid'>glut_HAS_MOUSE</span> <span class='hs-varop'>$</span>
<a name="line-237"></a> <span class='hs-varid'>deviceGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_NUM_MOUSE_BUTTONS</span>
<a name="line-238"></a>
<a name="line-239"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-240"></a>
<a name="line-241"></a><span class='hs-comment'>-- | Contains 'Just' the number of buttons of the attached Spaceball or 'Nothing'</span>
<a name="line-242"></a><span class='hs-comment'>-- if there is none.</span>
<a name="line-243"></a>
<a name="line-244"></a><a name="numSpaceballButtons"></a><span class='hs-definition'>numSpaceballButtons</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>ButtonCount</span><span class='hs-layout'>)</span>
<a name="line-245"></a><span class='hs-definition'>numSpaceballButtons</span> <span class='hs-keyglyph'>=</span>
<a name="line-246"></a> <span class='hs-varid'>getDeviceInfo</span> <span class='hs-varid'>glut_HAS_SPACEBALL</span> <span class='hs-varop'>$</span>
<a name="line-247"></a> <span class='hs-varid'>deviceGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_NUM_SPACEBALL_BUTTONS</span>
<a name="line-248"></a>
<a name="line-249"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-250"></a>
<a name="line-251"></a><span class='hs-comment'>-- | Number of dials of a dial and button box</span>
<a name="line-252"></a>
<a name="line-253"></a><a name="DialCount"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>DialCount</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Int</span>
<a name="line-254"></a>
<a name="line-255"></a><span class='hs-comment'>-- | Contains 'Just' the number of dials and buttons of an attached dial &</span>
<a name="line-256"></a><span class='hs-comment'>-- button box or 'Nothing' if there is none.</span>
<a name="line-257"></a>
<a name="line-258"></a><a name="numDialsAndButtons"></a><span class='hs-definition'>numDialsAndButtons</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>DialCount</span><span class='hs-layout'>,</span> <span class='hs-conid'>ButtonCount</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-259"></a><span class='hs-definition'>numDialsAndButtons</span> <span class='hs-keyglyph'>=</span>
<a name="line-260"></a> <span class='hs-varid'>getDeviceInfo</span> <span class='hs-varid'>glut_HAS_DIAL_AND_BUTTON_BOX</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-261"></a> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>deviceGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_NUM_DIALS</span>
<a name="line-262"></a> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>deviceGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_NUM_BUTTON_BOX_BUTTONS</span>
<a name="line-263"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-264"></a>
<a name="line-265"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-266"></a>
<a name="line-267"></a><span class='hs-comment'>-- | Contains 'Just' the number of buttons of an attached tablet or 'Nothing' if</span>
<a name="line-268"></a><span class='hs-comment'>-- there is none.</span>
<a name="line-269"></a>
<a name="line-270"></a><a name="numTabletButtons"></a><span class='hs-definition'>numTabletButtons</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>ButtonCount</span><span class='hs-layout'>)</span>
<a name="line-271"></a><span class='hs-definition'>numTabletButtons</span> <span class='hs-keyglyph'>=</span>
<a name="line-272"></a> <span class='hs-varid'>getDeviceInfo</span> <span class='hs-varid'>glut_HAS_TABLET</span> <span class='hs-varop'>$</span>
<a name="line-273"></a> <span class='hs-varid'>deviceGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_NUM_TABLET_BUTTONS</span>
<a name="line-274"></a>
<a name="line-275"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-276"></a>
<a name="line-277"></a><span class='hs-comment'>-- | Number of axes of a joystick</span>
<a name="line-278"></a>
<a name="line-279"></a><a name="AxisCount"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>AxisCount</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Int</span>
<a name="line-280"></a>
<a name="line-281"></a><span class='hs-comment'>-- | The a rate at which a joystick is polled (in milliseconds)</span>
<a name="line-282"></a>
<a name="line-283"></a><a name="PollRate"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>PollRate</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Int</span>
<a name="line-284"></a>
<a name="line-285"></a><span class='hs-comment'>-- | Contains 'Just' the number of buttons of an attached joystick, the number</span>
<a name="line-286"></a><span class='hs-comment'>-- of joystick axes, and the rate at which the joystick is polled. Contains</span>
<a name="line-287"></a><span class='hs-comment'>-- 'Nothing' if there is no joystick attached.</span>
<a name="line-288"></a>
<a name="line-289"></a><a name="joystickInfo"></a><span class='hs-definition'>joystickInfo</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>ButtonCount</span><span class='hs-layout'>,</span> <span class='hs-conid'>PollRate</span><span class='hs-layout'>,</span> <span class='hs-conid'>AxisCount</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-290"></a><span class='hs-definition'>joystickInfo</span> <span class='hs-keyglyph'>=</span>
<a name="line-291"></a> <span class='hs-varid'>getDeviceInfo</span> <span class='hs-varid'>glut_HAS_JOYSTICK</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-292"></a> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>deviceGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_JOYSTICK_BUTTONS</span>
<a name="line-293"></a> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>deviceGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_JOYSTICK_AXES</span>
<a name="line-294"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>deviceGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_JOYSTICK_POLL_RATE</span>
<a name="line-295"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-296"></a>
<a name="line-297"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-298"></a>
<a name="line-299"></a><span class='hs-comment'>-- | (/freeglut only/) Contains a list of the number of auxiliary buffers</span>
<a name="line-300"></a><span class='hs-comment'>-- supported, in increasing order.</span>
<a name="line-301"></a>
<a name="line-302"></a><a name="supportedNumAuxBuffers"></a><span class='hs-definition'>supportedNumAuxBuffers</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span>
<a name="line-303"></a><span class='hs-definition'>supportedNumAuxBuffers</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getModeValues</span> <span class='hs-varid'>glut_AUX</span>
<a name="line-304"></a>
<a name="line-305"></a><span class='hs-comment'>-- | (/freeglut only/) Contains a list of the number of samples per pixel</span>
<a name="line-306"></a><span class='hs-comment'>-- supported for multisampling, in increasing order.</span>
<a name="line-307"></a>
<a name="line-308"></a><a name="supportedSamplesPerPixel"></a><span class='hs-definition'>supportedSamplesPerPixel</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>SampleCount</span><span class='hs-keyglyph'>]</span>
<a name="line-309"></a><span class='hs-definition'>supportedSamplesPerPixel</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getModeValues</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_MULTISAMPLE</span><span class='hs-layout'>)</span>
<a name="line-310"></a>
<a name="line-311"></a><a name="getModeValues"></a><span class='hs-definition'>getModeValues</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-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-312"></a><span class='hs-definition'>getModeValues</span> <span class='hs-varid'>what</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span>
<a name="line-313"></a> <span class='hs-varid'>alloca</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>sizeBuffer</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-314"></a> <span class='hs-varid'>valuesBuffer</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>glutGetModeValues</span> <span class='hs-varid'>what</span> <span class='hs-varid'>sizeBuffer</span>
<a name="line-315"></a> <span class='hs-varid'>size</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>peek</span> <span class='hs-varid'>sizeBuffer</span>
<a name="line-316"></a> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>fromIntegral</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>peekArray</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>size</span><span class='hs-layout'>)</span> <span class='hs-varid'>valuesBuffer</span>
<a name="line-317"></a>
<a name="line-318"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-319"></a><span class='hs-comment'>-- Convenience unmarshalers</span>
<a name="line-320"></a>
<a name="line-321"></a><a name="i2b"></a><span class='hs-definition'>i2b</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CInt</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-322"></a><span class='hs-definition'>i2b</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-323"></a>
<a name="line-324"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-325"></a>
<a name="line-326"></a><a name="getDeviceInfo"></a><span class='hs-definition'>getDeviceInfo</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GLenum</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-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-327"></a><span class='hs-definition'>getDeviceInfo</span> <span class='hs-varid'>dev</span> <span class='hs-varid'>act</span> <span class='hs-keyglyph'>=</span>
<a name="line-328"></a> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-329"></a> <span class='hs-varid'>hasDevice</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>deviceGet</span> <span class='hs-varid'>i2b</span> <span class='hs-varid'>dev</span>
<a name="line-330"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>hasDevice</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>fmap</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>act</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-331"></a>
<a name="line-332"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-333"></a>
<a name="line-334"></a><span class='hs-comment'>-- | Contains version of GLUT in the form of</span>
<a name="line-335"></a><span class='hs-comment'>-- @/flavour/ /major/./minor/./patchlevel/@, where @/flavour/@ is one of</span>
<a name="line-336"></a><span class='hs-comment'>-- @GLUT@, @freeglut@ or @OpenGLUT@.</span>
<a name="line-337"></a>
<a name="line-338"></a><a name="glutVersion"></a><span class='hs-definition'>glutVersion</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>String</span>
<a name="line-339"></a><span class='hs-definition'>glutVersion</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-340"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>isGLUT</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isUnknown</span> <span class='hs-str'>"glutSetOption"</span>
<a name="line-341"></a> <span class='hs-varid'>isFreeglut</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isUnknown</span> <span class='hs-str'>"glutSetWindowStayOnTop"</span>
<a name="line-342"></a> <span class='hs-varid'>isUnknown</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</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'>getAPIEntryInternal</span>
<a name="line-343"></a> <span class='hs-varid'>showVersionPart</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>shows</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varop'>`mod`</span> <span class='hs-num'>100</span><span class='hs-layout'>)</span>
<a name="line-344"></a> <span class='hs-varid'>showVersion</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showVersionPart</span> <span class='hs-layout'>(</span><span class='hs-varid'>v</span> <span class='hs-varop'>`div`</span> <span class='hs-num'>10000</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>showChar</span> <span class='hs-chr'>'.'</span> <span class='hs-varop'>.</span>
<a name="line-345"></a> <span class='hs-varid'>showVersionPart</span> <span class='hs-layout'>(</span><span class='hs-varid'>v</span> <span class='hs-varop'>`div`</span> <span class='hs-num'>100</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>showChar</span> <span class='hs-chr'>'.'</span> <span class='hs-varop'>.</span>
<a name="line-346"></a> <span class='hs-varid'>showVersionPart</span> <span class='hs-varid'>v</span>
<a name="line-347"></a> <span class='hs-varid'>g</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>isGLUT</span>
<a name="line-348"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>g</span>
<a name="line-349"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-str'>"GLUT 3.7"</span> <span class='hs-comment'>-- ToDo: just guessing</span>
<a name="line-350"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>isFreeglut</span>
<a name="line-351"></a> <span class='hs-varid'>v</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>id</span> <span class='hs-varid'>glut_VERSION</span>
<a name="line-352"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>prefix</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>then</span> <span class='hs-str'>"freeglut"</span> <span class='hs-keyword'>else</span> <span class='hs-str'>"OpenGLUT"</span>
<a name="line-353"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>showString</span> <span class='hs-varid'>prefix</span> <span class='hs-varop'>.</span> <span class='hs-varid'>showChar</span> <span class='hs-chr'>' '</span> <span class='hs-varop'>.</span> <span class='hs-varid'>showVersion</span> <span class='hs-varid'>v</span> <span class='hs-varop'>$</span> <span class='hs-str'>""</span>
<a name="line-354"></a>
<a name="line-355"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-356"></a>
<a name="line-357"></a><span class='hs-comment'>-- | (/freeglut only/) Contains the thickness of the sizing border around the</span>
<a name="line-358"></a><span class='hs-comment'>-- perimeter of a window that can be resized, in pixels.</span>
<a name="line-359"></a>
<a name="line-360"></a><a name="windowBorderWidth"></a><span class='hs-definition'>windowBorderWidth</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>Int</span>
<a name="line-361"></a><span class='hs-definition'>windowBorderWidth</span> <span class='hs-keyglyph'>=</span>
<a name="line-362"></a> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-layout'>(</span><span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_BORDER_WIDTH</span><span class='hs-layout'>)</span>
<a name="line-363"></a>
<a name="line-364"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-365"></a>
<a name="line-366"></a><span class='hs-comment'>-- | (/freeglut only/) Contains the height of the header\/caption area of a</span>
<a name="line-367"></a><span class='hs-comment'>-- window in pixels.</span>
<a name="line-368"></a>
<a name="line-369"></a><a name="windowHeaderHeight"></a><span class='hs-definition'>windowHeaderHeight</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>Int</span>
<a name="line-370"></a><span class='hs-definition'>windowHeaderHeight</span> <span class='hs-keyglyph'>=</span>
<a name="line-371"></a> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-layout'>(</span><span class='hs-varid'>simpleGet</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>glut_WINDOW_HEADER_HEIGHT</span><span class='hs-layout'>)</span>
<a name="line-372"></a>
<a name="line-373"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-374"></a>
<a name="line-375"></a><span class='hs-comment'>-- | (/freeglut only/) Contains 'True' if GLUT has been initialized </span>
<a name="line-376"></a><span class='hs-comment'>-- with 'Graphics.UI.GLUT.Initialization.initialize' or</span>
<a name="line-377"></a><span class='hs-comment'>-- 'Graphics.UI.GLUT.Initialization.getArgsAndInitialize' has and not yet</span>
<a name="line-378"></a><span class='hs-comment'>-- been de-initialized with 'Graphics.UI.GLUT.Initialization.exit'. Contains</span>
<a name="line-379"></a><span class='hs-comment'>-- 'False' otherwise.</span>
<a name="line-380"></a>
<a name="line-381"></a><a name="initState"></a><span class='hs-definition'>initState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>Bool</span>
<a name="line-382"></a><span class='hs-definition'>initState</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>makeGettableStateVar</span><span class='hs-varop'>$</span> <span class='hs-varid'>simpleGet</span> <span class='hs-varid'>i2b</span> <span class='hs-varid'>glut_INIT_STATE</span>
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