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<title>Graphics/Gloss/Internals/Render/ViewPort.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS_HADDOCK hide #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE ScopedTypeVariables, Rank2Types #-}</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-comment'>-- | Handling the current viewport during rendering.</span>
<a name="line-5"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Render</span><span class='hs-varop'>.</span><span class='hs-conid'>ViewPort</span>
<a name="line-6"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>withViewPort</span> <span class='hs-layout'>)</span>
<a name="line-7"></a><span class='hs-keyword'>where</span>
<a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Interface</span><span class='hs-varop'>.</span><span class='hs-conid'>Backend</span>
<a name="line-9"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Gloss</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span><span class='hs-varop'>.</span><span class='hs-conid'>Interface</span><span class='hs-varop'>.</span><span class='hs-conid'>ViewPort</span>
<a name="line-10"></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'>GLfloat</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>
<a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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-keyword'>as</span> <span class='hs-conid'>GL</span>
<a name="line-12"></a>
<a name="line-13"></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>
<a name="line-14"></a>
<a name="line-15"></a><a name="withViewPort"></a><span class='hs-comment'>-- | Perform a rendering action whilst using the given viewport</span>
<a name="line-16"></a><span class='hs-definition'>withViewPort</span>
<a name="line-17"></a> <span class='hs-keyglyph'>::</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Backend</span> <span class='hs-varid'>a</span>
<a name="line-18"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>IORef</span> <span class='hs-varid'>a</span>
<a name="line-19"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ViewPort</span> <span class='hs-comment'>-- ^ The viewport to use.</span>
<a name="line-20"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <span class='hs-comment'>-- ^ The rendering action to perform.</span>
<a name="line-21"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-22"></a>
<a name="line-23"></a><span class='hs-definition'>withViewPort</span> <span class='hs-varid'>backendRef</span> <span class='hs-varid'>port</span> <span class='hs-varid'>action</span>
<a name="line-24"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-25"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>matrixMode</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Projection</span>
<a name="line-26"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>preservingMatrix</span>
<a name="line-27"></a> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-28"></a> <span class='hs-comment'>-- setup the co-ordinate system</span>
<a name="line-29"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>loadIdentity</span>
<a name="line-30"></a> <span class='hs-layout'>(</span><span class='hs-varid'>sizeX</span><span class='hs-layout'>,</span> <span class='hs-varid'>sizeY</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getWindowDimensions</span> <span class='hs-varid'>backendRef</span>
<a name="line-31"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>sx</span><span class='hs-layout'>,</span> <span class='hs-varid'>sy</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>sizeX</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>sizeY</span> <span class='hs-varop'>/</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-32"></a>
<a name="line-33"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>ortho</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-varid'>sx</span><span class='hs-layout'>)</span> <span class='hs-varid'>sx</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-varid'>sy</span><span class='hs-layout'>)</span> <span class='hs-varid'>sy</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>100</span><span class='hs-layout'>)</span>
<a name="line-34"></a>
<a name="line-35"></a> <span class='hs-comment'>-- draw the world</span>
<a name="line-36"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>matrixMode</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Modelview</span> <span class='hs-num'>0</span>
<a name="line-37"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>preservingMatrix</span>
<a name="line-38"></a> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-39"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>loadIdentity</span>
<a name="line-40"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>rotate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GLfloat</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>realToFrac</span> <span class='hs-varop'>$</span> <span class='hs-varid'>viewPortRotate</span> <span class='hs-varid'>port</span>
<a name="line-41"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>transX</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GLfloat</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>realToFrac</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fst</span> <span class='hs-varop'>$</span> <span class='hs-varid'>viewPortTranslate</span> <span class='hs-varid'>port</span>
<a name="line-42"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>transY</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GLfloat</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>realToFrac</span> <span class='hs-varop'>$</span> <span class='hs-varid'>snd</span> <span class='hs-varop'>$</span> <span class='hs-varid'>viewPortTranslate</span> <span class='hs-varid'>port</span>
<a name="line-43"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>scale</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GLfloat</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>realToFrac</span> <span class='hs-varop'>$</span> <span class='hs-varid'>viewPortScale</span> <span class='hs-varid'>port</span>
<a name="line-44"></a>
<a name="line-45"></a> <span class='hs-comment'>-- apply the global view transforms</span>
<a name="line-46"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>scale</span> <span class='hs-varid'>scale</span> <span class='hs-varid'>scale</span> <span class='hs-num'>1</span>
<a name="line-47"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>rotate</span> <span class='hs-varid'>rotate</span> <span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Vector3</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-48"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>translate</span> <span class='hs-layout'>(</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Vector3</span> <span class='hs-varid'>transX</span> <span class='hs-varid'>transY</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-49"></a>
<a name="line-50"></a> <span class='hs-comment'>-- call the client render action</span>
<a name="line-51"></a> <span class='hs-varid'>action</span>
<a name="line-52"></a>
<a name="line-53"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>matrixMode</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Projection</span>
<a name="line-54"></a>
<a name="line-55"></a> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-varid'>matrixMode</span> <span class='hs-varop'>$=</span> <span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>Modelview</span> <span class='hs-num'>0</span>
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