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<title>Graphics/Rendering/OpenGL/GL/BufferMode.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-- #hide</span>
<a name="line-2"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : Graphics.Rendering.OpenGL.GL.BufferMode</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) Sven Panne 2002-2009</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD-style (see the file libraries/OpenGL/LICENSE)</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer : sven.panne@aedion.de</span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : stable</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- This is a purely internal module for (un-)marshaling BufferMode.</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'>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'>BufferMode</span> <span class='hs-layout'>(</span>
<a name="line-17"></a> <span class='hs-conid'>BufferMode</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'>marshalBufferMode</span><span class='hs-layout'>,</span> <span class='hs-varid'>unmarshalBufferMode</span><span class='hs-layout'>,</span> <span class='hs-varid'>unmarshalBufferModeSafe</span><span class='hs-layout'>,</span>
<a name="line-18"></a> <span class='hs-varid'>maxColorAttachments</span><span class='hs-layout'>,</span>
<a name="line-19"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-20"></a>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>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'>Raw</span><span class='hs-varop'>.</span><span class='hs-conid'>Core31</span>
<a name="line-22"></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'>Raw</span><span class='hs-varop'>.</span><span class='hs-conid'>ARB</span><span class='hs-varop'>.</span><span class='hs-conid'>Compatibility</span> <span class='hs-layout'>(</span> <span class='hs-varid'>gl_AUX0</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-comment'>-- | The set of color buffers which are selected for reading and writing.</span>
<a name="line-27"></a>
<a name="line-28"></a><a name="BufferMode"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>BufferMode</span> <span class='hs-keyglyph'>=</span>
<a name="line-29"></a> <span class='hs-conid'>NoBuffers</span>
<a name="line-30"></a> <span class='hs-comment'>-- ^ No color buffers are selected.</span>
<a name="line-31"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>FrontLeftBuffer</span>
<a name="line-32"></a> <span class='hs-comment'>-- ^ Only the front left color buffer is selected.</span>
<a name="line-33"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>FrontRightBuffer</span>
<a name="line-34"></a> <span class='hs-comment'>-- ^ Only the front right color buffer is selected.</span>
<a name="line-35"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BackLeftBuffer</span>
<a name="line-36"></a> <span class='hs-comment'>-- ^ Only the back left color buffer is selected.</span>
<a name="line-37"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BackRightBuffer</span>
<a name="line-38"></a> <span class='hs-comment'>-- ^ Only the back right color buffer is selected.</span>
<a name="line-39"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>FrontBuffers</span>
<a name="line-40"></a> <span class='hs-comment'>-- ^ Only the front left and front right color buffers are selected. If</span>
<a name="line-41"></a> <span class='hs-comment'>-- there is no front right color buffer, only the front left color buffer</span>
<a name="line-42"></a> <span class='hs-comment'>-- is selected.</span>
<a name="line-43"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BackBuffers</span>
<a name="line-44"></a> <span class='hs-comment'>-- ^ Only the back left and back right color buffers are selected. If there</span>
<a name="line-45"></a> <span class='hs-comment'>-- is no back right color buffer, only the back left color buffer is</span>
<a name="line-46"></a> <span class='hs-comment'>-- selected.</span>
<a name="line-47"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>LeftBuffers</span>
<a name="line-48"></a> <span class='hs-comment'>-- ^ Only the front left and back left color buffers are selected. If there</span>
<a name="line-49"></a> <span class='hs-comment'>-- is no back left color buffer, only the front left color buffer is</span>
<a name="line-50"></a> <span class='hs-comment'>-- selected.</span>
<a name="line-51"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>RightBuffers</span>
<a name="line-52"></a> <span class='hs-comment'>-- ^ Only the front right and back right color buffers are selected. If</span>
<a name="line-53"></a> <span class='hs-comment'>-- there is no back right color buffer, only the front right color buffer</span>
<a name="line-54"></a> <span class='hs-comment'>-- is selected.</span>
<a name="line-55"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>FrontAndBackBuffers</span>
<a name="line-56"></a> <span class='hs-comment'>-- ^ All the front and back color buffers (front left, front right, back</span>
<a name="line-57"></a> <span class='hs-comment'>-- left, back right) are selected. If there are no back color buffers, only</span>
<a name="line-58"></a> <span class='hs-comment'>-- the front left and front right color buffers are selected. If there are</span>
<a name="line-59"></a> <span class='hs-comment'>-- no right color buffers, only the front left and back left color buffers</span>
<a name="line-60"></a> <span class='hs-comment'>-- are selected. If there are no right or back color buffers, only the</span>
<a name="line-61"></a> <span class='hs-comment'>-- front left color buffer is selected.</span>
<a name="line-62"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>AuxBuffer</span> <span class='hs-conid'>GLsizei</span>
<a name="line-63"></a> <span class='hs-comment'>-- ^ Only the given auxiliary color buffer no. /i/ is selected.</span>
<a name="line-64"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>FBOColorAttachment</span> <span class='hs-conid'>GLsizei</span>
<a name="line-65"></a> <span class='hs-comment'>-- ^ Only the given color attachment of the bound framebufferobject is selected for reading</span>
<a name="line-66"></a> <span class='hs-comment'>-- or writing.</span>
<a name="line-67"></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-68"></a>
<a name="line-69"></a><a name="marshalBufferMode"></a><span class='hs-definition'>marshalBufferMode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>BufferMode</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>GLenum</span>
<a name="line-70"></a><span class='hs-definition'>marshalBufferMode</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-71"></a> <span class='hs-conid'>NoBuffers</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>gl_NONE</span>
<a name="line-72"></a> <span class='hs-conid'>FrontLeftBuffer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>gl_FRONT_LEFT</span>
<a name="line-73"></a> <span class='hs-conid'>FrontRightBuffer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>gl_FRONT_RIGHT</span>
<a name="line-74"></a> <span class='hs-conid'>BackLeftBuffer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>gl_BACK_LEFT</span>
<a name="line-75"></a> <span class='hs-conid'>BackRightBuffer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>gl_BACK_RIGHT</span>
<a name="line-76"></a> <span class='hs-conid'>FrontBuffers</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>gl_FRONT</span>
<a name="line-77"></a> <span class='hs-conid'>BackBuffers</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>gl_BACK</span>
<a name="line-78"></a> <span class='hs-conid'>LeftBuffers</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>gl_LEFT</span>
<a name="line-79"></a> <span class='hs-conid'>RightBuffers</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>gl_RIGHT</span>
<a name="line-80"></a> <span class='hs-conid'>FrontAndBackBuffers</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>gl_FRONT_AND_BACK</span>
<a name="line-81"></a> <span class='hs-conid'>AuxBuffer</span> <span class='hs-varid'>i</span>
<a name="line-82"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>i</span> <span class='hs-varop'><=</span> <span class='hs-varid'>maxAuxBuffer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>gl_AUX0</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span>
<a name="line-83"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-84"></a> <span class='hs-conid'>FBOColorAttachment</span> <span class='hs-varid'>i</span>
<a name="line-85"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>i</span> <span class='hs-varop'><=</span> <span class='hs-varid'>maxColorAttachments</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>gl_COLOR_ATTACHMENT0</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span>
<a name="line-86"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-87"></a>
<a name="line-88"></a><a name="unmarshalBufferMode"></a><span class='hs-definition'>unmarshalBufferMode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>BufferMode</span>
<a name="line-89"></a><span class='hs-definition'>unmarshalBufferMode</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe</span>
<a name="line-90"></a> <span class='hs-layout'>(</span><span class='hs-varid'>error</span> <span class='hs-layout'>(</span><span class='hs-str'>"unmarshalBufferMode: 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><span class='hs-layout'>)</span> <span class='hs-varid'>id</span> <span class='hs-varop'>$</span> <span class='hs-varid'>unmarshalBufferModeSafe</span> <span class='hs-varid'>x</span>
<a name="line-91"></a><span class='hs-comment'>--unmarshalBufferMode x</span>
<a name="line-92"></a><span class='hs-comment'>-- | x == gl_NONE = NoBuffers</span>
<a name="line-93"></a><span class='hs-comment'>-- | x == gl_FRONT_LEFT = FrontLeftBuffer</span>
<a name="line-94"></a><span class='hs-comment'>-- | x == gl_FRONT_RIGHT = FrontRightBuffer</span>
<a name="line-95"></a><span class='hs-comment'>-- | x == gl_BACK_LEFT = BackLeftBuffer</span>
<a name="line-96"></a><span class='hs-comment'>-- | x == gl_BACK_RIGHT = BackRightBuffer</span>
<a name="line-97"></a><span class='hs-comment'>-- | x == gl_FRONT = FrontBuffers</span>
<a name="line-98"></a><span class='hs-comment'>-- | x == gl_BACK = BackBuffers</span>
<a name="line-99"></a><span class='hs-comment'>-- | x == gl_LEFT = LeftBuffers</span>
<a name="line-100"></a><span class='hs-comment'>-- | x == gl_RIGHT = RightBuffers</span>
<a name="line-101"></a><span class='hs-comment'>-- | x == gl_FRONT_AND_BACK = FrontAndBackBuffers</span>
<a name="line-102"></a><span class='hs-comment'>-- | gl_AUX0 <= x && x <= gl_AUX0 + maxAuxBuffer = AuxBuffer (fromIntegral (x - gl_AUX0))</span>
<a name="line-103"></a><span class='hs-comment'>-- | otherwise = error ("unmarshalBufferMode: illegal value " ++ show x)</span>
<a name="line-104"></a>
<a name="line-105"></a><a name="unmarshalBufferModeSafe"></a><span class='hs-definition'>unmarshalBufferModeSafe</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>BufferMode</span>
<a name="line-106"></a><span class='hs-definition'>unmarshalBufferModeSafe</span> <span class='hs-varid'>x</span>
<a name="line-107"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>gl_NONE</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>NoBuffers</span>
<a name="line-108"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>gl_FRONT_LEFT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>FrontLeftBuffer</span>
<a name="line-109"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>gl_FRONT_RIGHT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>FrontRightBuffer</span>
<a name="line-110"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>gl_BACK_LEFT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>BackLeftBuffer</span>
<a name="line-111"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>gl_BACK_RIGHT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>BackRightBuffer</span>
<a name="line-112"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>gl_FRONT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>FrontBuffers</span>
<a name="line-113"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>gl_BACK</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>BackBuffers</span>
<a name="line-114"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>gl_LEFT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>LeftBuffers</span>
<a name="line-115"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>gl_RIGHT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>RightBuffers</span>
<a name="line-116"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>gl_FRONT_AND_BACK</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>FrontAndBackBuffers</span>
<a name="line-117"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>gl_AUX0</span> <span class='hs-varop'><=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>x</span> <span class='hs-varop'><=</span> <span class='hs-varid'>gl_AUX0</span> <span class='hs-varop'>+</span> <span class='hs-varid'>maxAuxBuffer</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>.</span> <span class='hs-conid'>AuxBuffer</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-varid'>x</span> <span class='hs-comment'>-</span> <span class='hs-varid'>gl_AUX0</span>
<a name="line-118"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>gl_COLOR_ATTACHMENT0</span> <span class='hs-varop'><=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>x</span> <span class='hs-varop'><=</span> <span class='hs-varid'>gl_COLOR_ATTACHMENT0</span> <span class='hs-varop'>+</span> <span class='hs-varid'>maxColorAttachments</span>
<a name="line-119"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>.</span> <span class='hs-conid'>FBOColorAttachment</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-varid'>x</span> <span class='hs-comment'>-</span> <span class='hs-varid'>gl_COLOR_ATTACHMENT0</span>
<a name="line-120"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-121"></a>
<a name="line-122"></a><a name="maxAuxBuffer"></a><span class='hs-definition'>maxAuxBuffer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GLenum</span>
<a name="line-123"></a><span class='hs-definition'>maxAuxBuffer</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>246</span>
<a name="line-124"></a>
<a name="line-125"></a><a name="maxColorAttachments"></a><span class='hs-definition'>maxColorAttachments</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GLenum</span>
<a name="line-126"></a><span class='hs-definition'>maxColorAttachments</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>16</span>
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