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<title>Graphics/Rendering/OpenGL/GL/Rectangles.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.Rectangles</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'>-- This module corresponds to section 2.10 (Rectangles) of the OpenGL 2.1 specs.</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-14"></a>
<a name="line-15"></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'>Rectangles</span> <span class='hs-layout'>(</span>
<a name="line-16"></a> <span class='hs-conid'>Rect</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-17"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Int</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Ptr</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Ptr</span> <span class='hs-layout'>)</span>
<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'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>BasicTypes</span> <span class='hs-layout'>(</span>
<a name="line-22"></a> <span class='hs-conid'>GLshort</span><span class='hs-layout'>,</span> <span class='hs-conid'>GLint</span><span class='hs-layout'>,</span> <span class='hs-conid'>GLfloat</span><span class='hs-layout'>,</span> <span class='hs-conid'>GLdouble</span> <span class='hs-layout'>)</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>OpenGL</span><span class='hs-varop'>.</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>VertexSpec</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Vertex2</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-24"></a><span class='hs-cpp'>#ifdef __HADDOCK__</span>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>Rendering</span><span class='hs-varop'>.</span><span class='hs-conid'>OpenGL</span><span class='hs-varop'>.</span><span class='hs-conid'>GL</span><span class='hs-varop'>.</span><span class='hs-conid'>BeginEnd</span> <span class='hs-layout'>(</span> <span class='hs-conid'>PrimitiveMode</span><span class='hs-layout'>(</span><span class='hs-conid'>Polygon</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-26"></a><span class='hs-cpp'>#endif</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><span class='hs-cpp'>#include "HsOpenGLExt.h"</span>
<a name="line-31"></a><span class='hs-cpp'>#include "HsOpenGLTypes.h"</span>
<a name="line-32"></a>
<a name="line-33"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-34"></a>
<a name="line-35"></a><span class='hs-comment'>-- | 'rect' and 'rectv' support efficient specification of rectangles as two</span>
<a name="line-36"></a><span class='hs-comment'>-- corner points. Each rectangle command takes four arguments, organized either</span>
<a name="line-37"></a><span class='hs-comment'>-- as two consecutive pairs of (/x/, /y/) coordinates, or as two pointers to</span>
<a name="line-38"></a><span class='hs-comment'>-- arrays, each containing an (/x/, /y/) pair. The resulting rectangle is</span>
<a name="line-39"></a><span class='hs-comment'>-- defined in the /z/ = 0 plane.</span>
<a name="line-40"></a><span class='hs-comment'>--</span>
<a name="line-41"></a><span class='hs-comment'>-- @'rect' ('Vertex2' x1 y1) ('Vertex2' x2, y2)@ is exactly equivalent to the</span>
<a name="line-42"></a><span class='hs-comment'>-- following sequence:</span>
<a name="line-43"></a><span class='hs-comment'>--</span>
<a name="line-44"></a><span class='hs-comment'>-- @</span>
<a name="line-45"></a><span class='hs-comment'>-- 'Graphics.Rendering.OpenGL.GL.BeginEnd.renderPrimitive' 'Graphics.Rendering.OpenGL.GL.BeginEnd.Polygon' $ do</span>
<a name="line-46"></a><span class='hs-comment'>-- 'Graphics.Rendering.OpenGL.GL.VertexSpec.vertex' ('Vertex2' x1 y1)</span>
<a name="line-47"></a><span class='hs-comment'>-- 'Graphics.Rendering.OpenGL.GL.VertexSpec.vertex' ('Vertex2' x2 y1)</span>
<a name="line-48"></a><span class='hs-comment'>-- 'Graphics.Rendering.OpenGL.GL.VertexSpec.vertex' ('Vertex2' x2 y2)</span>
<a name="line-49"></a><span class='hs-comment'>-- 'Graphics.Rendering.OpenGL.GL.VertexSpec.vertex' ('Vertex2' x1 y2)</span>
<a name="line-50"></a><span class='hs-comment'>-- @</span>
<a name="line-51"></a><span class='hs-comment'>--</span>
<a name="line-52"></a><span class='hs-comment'>-- Note that if the second vertex is above and to the right of the first vertex,</span>
<a name="line-53"></a><span class='hs-comment'>-- the rectangle is constructed with a counterclockwise winding.</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="Rect"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Rect</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-56"></a> <span class='hs-varid'>rect</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Vertex2</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Vertex2</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-57"></a> <span class='hs-varid'>rectv</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Ptr</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</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-58"></a>
<a name="line-59"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-60"></a>
<a name="line-61"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"glRects"</span> <span class='hs-varid'>glRects</span> <span class='hs-keyglyph'>::</span>
<a name="line-62"></a> <span class='hs-conid'>GLshort</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLshort</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLshort</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLshort</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-63"></a>
<a name="line-64"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"glRectsv"</span> <span class='hs-varid'>glRectsv</span> <span class='hs-keyglyph'>::</span>
<a name="line-65"></a> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>GLshort</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>GLshort</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-66"></a>
<a name="line-67"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Rect</span> <span class='hs-conid'>GLshort_</span> <span class='hs-keyword'>where</span>
<a name="line-68"></a> <span class='hs-varid'>rect</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex2</span> <span class='hs-varid'>x1</span> <span class='hs-varid'>y1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex2</span> <span class='hs-varid'>x2</span> <span class='hs-varid'>y2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>glRects</span> <span class='hs-varid'>x1</span> <span class='hs-varid'>y1</span> <span class='hs-varid'>x2</span> <span class='hs-varid'>y2</span>
<a name="line-69"></a> <span class='hs-varid'>rectv</span> <span class='hs-varid'>ptr1</span> <span class='hs-varid'>ptr2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>glRectsv</span> <span class='hs-varid'>ptr1</span> <span class='hs-varid'>ptr2</span>
<a name="line-70"></a>
<a name="line-71"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-72"></a>
<a name="line-73"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"glRecti"</span> <span class='hs-varid'>glRecti</span> <span class='hs-keyglyph'>::</span>
<a name="line-74"></a> <span class='hs-conid'>GLint</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLint</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLint</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLint</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-75"></a>
<a name="line-76"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"glRectiv"</span> <span class='hs-varid'>glRectiv</span> <span class='hs-keyglyph'>::</span>
<a name="line-77"></a> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>GLint</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>GLint</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-78"></a>
<a name="line-79"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Rect</span> <span class='hs-conid'>GLint_</span> <span class='hs-keyword'>where</span>
<a name="line-80"></a> <span class='hs-varid'>rect</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex2</span> <span class='hs-varid'>x1</span> <span class='hs-varid'>y1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex2</span> <span class='hs-varid'>x2</span> <span class='hs-varid'>y2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>glRecti</span> <span class='hs-varid'>x1</span> <span class='hs-varid'>y1</span> <span class='hs-varid'>x2</span> <span class='hs-varid'>y2</span>
<a name="line-81"></a> <span class='hs-varid'>rectv</span> <span class='hs-varid'>ptr1</span> <span class='hs-varid'>ptr2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>glRectiv</span> <span class='hs-varid'>ptr1</span> <span class='hs-varid'>ptr2</span>
<a name="line-82"></a>
<a name="line-83"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span>
<a name="line-84"></a>
<a name="line-85"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"glRectf"</span> <span class='hs-varid'>glRectf</span> <span class='hs-keyglyph'>::</span>
<a name="line-86"></a> <span class='hs-conid'>GLfloat</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLfloat</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLfloat</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLfloat</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-87"></a>
<a name="line-88"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"glRectfv"</span> <span class='hs-varid'>glRectfv</span> <span class='hs-keyglyph'>::</span>
<a name="line-89"></a> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>GLfloat</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>GLfloat</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-90"></a>
<a name="line-91"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Rect</span> <span class='hs-conid'>GLfloat_</span> <span class='hs-keyword'>where</span>
<a name="line-92"></a> <span class='hs-varid'>rect</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex2</span> <span class='hs-varid'>x1</span> <span class='hs-varid'>y1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex2</span> <span class='hs-varid'>x2</span> <span class='hs-varid'>y2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>glRectf</span> <span class='hs-varid'>x1</span> <span class='hs-varid'>y1</span> <span class='hs-varid'>x2</span> <span class='hs-varid'>y2</span>
<a name="line-93"></a> <span class='hs-varid'>rectv</span> <span class='hs-varid'>ptr1</span> <span class='hs-varid'>ptr2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>glRectfv</span> <span class='hs-varid'>ptr1</span> <span class='hs-varid'>ptr2</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'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"glRectd"</span> <span class='hs-varid'>glRectd</span> <span class='hs-keyglyph'>::</span>
<a name="line-98"></a> <span class='hs-conid'>GLdouble</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLdouble</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLdouble</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLdouble</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-99"></a>
<a name="line-100"></a><span class='hs-keyword'>foreign</span> <span class='hs-keyword'>import</span> <span class='hs-conid'>CALLCONV</span> <span class='hs-keyword'>unsafe</span> <span class='hs-str'>"glRectdv"</span> <span class='hs-varid'>glRectdv</span> <span class='hs-keyglyph'>::</span>
<a name="line-101"></a> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>GLdouble</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ptr</span> <span class='hs-conid'>GLdouble</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-102"></a>
<a name="line-103"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Rect</span> <span class='hs-conid'>GLdouble_</span> <span class='hs-keyword'>where</span>
<a name="line-104"></a> <span class='hs-varid'>rect</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex2</span> <span class='hs-varid'>x1</span> <span class='hs-varid'>y1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Vertex2</span> <span class='hs-varid'>x2</span> <span class='hs-varid'>y2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>glRectd</span> <span class='hs-varid'>x1</span> <span class='hs-varid'>y1</span> <span class='hs-varid'>x2</span> <span class='hs-varid'>y2</span>
<a name="line-105"></a> <span class='hs-varid'>rectv</span> <span class='hs-varid'>ptr1</span> <span class='hs-varid'>ptr2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>glRectdv</span> <span class='hs-varid'>ptr1</span> <span class='hs-varid'>ptr2</span>
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