<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <!-- Generated by HsColour, http://www.cs.york.ac.uk/fp/darcs/hscolour/ --> <title>Graphics/Rendering/OpenGL/GL/PixelRectangles/Histogram.hs</title> <link type='text/css' rel='stylesheet' href='hscolour.css' /> </head> <body> <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.PixelRectangles.Histogram</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 a part of section 3.6.1 (Pixel Storage Modes) of</span> <a name="line-12"></a><span class='hs-comment'>-- the OpenGL 2.1 specs.</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'>PixelRectangles</span><span class='hs-varop'>.</span><span class='hs-conid'>Histogram</span> <span class='hs-layout'>(</span> <a name="line-17"></a> <span class='hs-conid'>Sink</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'>histogram</span><span class='hs-layout'>,</span> <span class='hs-conid'>Reset</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'>getHistogram</span><span class='hs-layout'>,</span> <span class='hs-varid'>resetHistogram</span><span class='hs-layout'>,</span> <a name="line-18"></a> <span class='hs-varid'>histogramRGBASizes</span><span class='hs-layout'>,</span> <span class='hs-varid'>histogramLuminanceSize</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'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Marshal</span><span class='hs-varop'>.</span><span class='hs-conid'>Alloc</span> <span class='hs-layout'>(</span> <span class='hs-varid'>alloca</span> <span class='hs-layout'>)</span> <a name="line-22"></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-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'>Capability</span> <span class='hs-layout'>(</span> <a name="line-24"></a> <span class='hs-conid'>EnableCap</span><span class='hs-layout'>(</span><span class='hs-conid'>CapHistogram</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>makeStateVarMaybe</span> <span class='hs-layout'>)</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'>BasicTypes</span> <span class='hs-layout'>(</span> <a name="line-26"></a> <span class='hs-conid'>GLboolean</span><span class='hs-layout'>,</span> <span class='hs-conid'>GLenum</span><span class='hs-layout'>,</span> <span class='hs-conid'>GLint</span><span class='hs-layout'>,</span> <span class='hs-conid'>GLsizei</span> <span class='hs-layout'>)</span> <a name="line-27"></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'>Extensions</span> <span class='hs-layout'>(</span> <a name="line-28"></a> <span class='hs-conid'>FunPtr</span><span class='hs-layout'>,</span> <span class='hs-varid'>unsafePerformIO</span><span class='hs-layout'>,</span> <span class='hs-conid'>Invoker</span><span class='hs-layout'>,</span> <span class='hs-varid'>getProcAddress</span> <span class='hs-layout'>)</span> <a name="line-29"></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'>PeekPoke</span> <span class='hs-layout'>(</span> <span class='hs-varid'>peek1</span> <span class='hs-layout'>)</span> <a name="line-30"></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'>PixelRectangles</span><span class='hs-varop'>.</span><span class='hs-conid'>Rasterization</span> <span class='hs-layout'>(</span> <a name="line-31"></a> <span class='hs-conid'>PixelData</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span> <a name="line-32"></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'>PixelRectangles</span><span class='hs-varop'>.</span><span class='hs-conid'>ColorTable</span> <span class='hs-layout'>(</span> <a name="line-33"></a> <span class='hs-conid'>PixelInternalFormat</span> <span class='hs-layout'>)</span> <a name="line-34"></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'>PixelData</span> <span class='hs-layout'>(</span> <span class='hs-varid'>withPixelData</span> <span class='hs-layout'>)</span> <a name="line-35"></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'>Texturing</span><span class='hs-varop'>.</span><span class='hs-conid'>PixelInternalFormat</span> <span class='hs-layout'>(</span> <a name="line-36"></a> <span class='hs-varid'>marshalPixelInternalFormat'</span><span class='hs-layout'>,</span> <span class='hs-varid'>unmarshalPixelInternalFormat</span> <span class='hs-layout'>)</span> <a name="line-37"></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'>PixelRectangles</span><span class='hs-varop'>.</span><span class='hs-conid'>ColorTable</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Proxy</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span> <a name="line-38"></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'>PixelRectangles</span><span class='hs-varop'>.</span><span class='hs-conid'>Sink</span> <span class='hs-layout'>(</span> <a name="line-39"></a> <span class='hs-conid'>Sink</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'>marshalSink</span><span class='hs-layout'>,</span> <span class='hs-varid'>unmarshalSink</span> <span class='hs-layout'>)</span> <a name="line-40"></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'>PixelRectangles</span><span class='hs-varop'>.</span><span class='hs-conid'>Reset</span> <span class='hs-layout'>(</span> <a name="line-41"></a> <span class='hs-conid'>Reset</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'>marshalReset</span> <span class='hs-layout'>)</span> <a name="line-42"></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'>StateVar</span> <span class='hs-layout'>(</span> <a name="line-43"></a> <span class='hs-conid'>GettableStateVar</span><span class='hs-layout'>,</span> <span class='hs-varid'>makeGettableStateVar</span><span class='hs-layout'>,</span> <span class='hs-conid'>StateVar</span> <span class='hs-layout'>)</span> <a name="line-44"></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'>Color4</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span> <a name="line-45"></a> <a name="line-46"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-47"></a> <a name="line-48"></a><span class='hs-cpp'>#include "HsOpenGLExt.h"</span> <a name="line-49"></a> <a name="line-50"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-51"></a> <a name="line-52"></a><a name="HistogramTarget"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>HistogramTarget</span> <span class='hs-keyglyph'>=</span> <a name="line-53"></a> <span class='hs-conid'>Histogram</span> <a name="line-54"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>ProxyHistogram</span> <a name="line-55"></a> <a name="line-56"></a><a name="marshalHistogramTarget"></a><span class='hs-definition'>marshalHistogramTarget</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>HistogramTarget</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</span> <a name="line-57"></a><span class='hs-definition'>marshalHistogramTarget</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-58"></a> <span class='hs-conid'>Histogram</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x8024</span> <a name="line-59"></a> <span class='hs-conid'>ProxyHistogram</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x8025</span> <a name="line-60"></a> <a name="line-61"></a><a name="proxyToHistogramTarget"></a><span class='hs-definition'>proxyToHistogramTarget</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Proxy</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HistogramTarget</span> <a name="line-62"></a><span class='hs-definition'>proxyToHistogramTarget</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-63"></a> <span class='hs-conid'>NoProxy</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Histogram</span> <a name="line-64"></a> <span class='hs-conid'>Proxy</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ProxyHistogram</span> <a name="line-65"></a> <a name="line-66"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-67"></a> <a name="line-68"></a><a name="histogram"></a><span class='hs-definition'>histogram</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Proxy</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StateVar</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>GLsizei</span><span class='hs-layout'>,</span> <span class='hs-conid'>PixelInternalFormat</span><span class='hs-layout'>,</span> <span class='hs-conid'>Sink</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-69"></a><span class='hs-definition'>histogram</span> <span class='hs-varid'>proxy</span> <span class='hs-keyglyph'>=</span> <a name="line-70"></a> <span class='hs-varid'>makeStateVarMaybe</span> <a name="line-71"></a> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>CapHistogram</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>getHistogram'</span> <span class='hs-varid'>proxy</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>setHistogram</span> <span class='hs-varid'>proxy</span><span class='hs-layout'>)</span> <a name="line-72"></a> <a name="line-73"></a><a name="getHistogram'"></a><span class='hs-definition'>getHistogram'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Proxy</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>GLsizei</span><span class='hs-layout'>,</span> <span class='hs-conid'>PixelInternalFormat</span><span class='hs-layout'>,</span> <span class='hs-conid'>Sink</span><span class='hs-layout'>)</span> <a name="line-74"></a><span class='hs-definition'>getHistogram'</span> <span class='hs-varid'>proxy</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-75"></a> <span class='hs-varid'>w</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getHistogramParameteri</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>proxy</span> <span class='hs-conid'>HistogramWidth</span> <a name="line-76"></a> <span class='hs-varid'>f</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getHistogramParameteri</span> <span class='hs-varid'>unmarshalPixelInternalFormat</span> <span class='hs-varid'>proxy</span> <span class='hs-conid'>HistogramFormat</span> <a name="line-77"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getHistogramParameteri</span> <span class='hs-varid'>unmarshalSink</span> <span class='hs-varid'>proxy</span> <span class='hs-conid'>HistogramSink</span> <a name="line-78"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-varid'>f</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <a name="line-79"></a> <a name="line-80"></a><a name="getHistogramParameteri"></a><span class='hs-definition'>getHistogramParameteri</span> <span class='hs-keyglyph'>::</span> <a name="line-81"></a> <span class='hs-layout'>(</span><span class='hs-conid'>GLint</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Proxy</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GetHistogramParameterPName</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>a</span> <a name="line-82"></a><span class='hs-definition'>getHistogramParameteri</span> <span class='hs-varid'>f</span> <span class='hs-varid'>proxy</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <a name="line-83"></a> <span class='hs-varid'>alloca</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>buf</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <a name="line-84"></a> <span class='hs-varid'>glGetHistogramParameteriv</span> <a name="line-85"></a> <span class='hs-layout'>(</span><span class='hs-varid'>marshalHistogramTarget</span> <span class='hs-layout'>(</span><span class='hs-varid'>proxyToHistogramTarget</span> <span class='hs-varid'>proxy</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-86"></a> <span class='hs-layout'>(</span><span class='hs-varid'>marshalGetHistogramParameterPName</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <a name="line-87"></a> <span class='hs-varid'>buf</span> <a name="line-88"></a> <span class='hs-varid'>peek1</span> <span class='hs-varid'>f</span> <span class='hs-varid'>buf</span> <a name="line-89"></a> <a name="line-90"></a><span class='hs-conid'>EXTENSION_ENTRY</span><span class='hs-layout'>(</span><span class='hs-str'>"GL_ARB_imaging"</span><span class='hs-layout'>,</span><span class='hs-varid'>glGetHistogramParameteriv</span><span class='hs-layout'>,</span><span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</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><span class='hs-layout'>)</span> <a name="line-91"></a> <a name="line-92"></a><a name="setHistogram"></a><span class='hs-definition'>setHistogram</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Proxy</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>GLsizei</span><span class='hs-layout'>,</span> <span class='hs-conid'>PixelInternalFormat</span><span class='hs-layout'>,</span> <span class='hs-conid'>Sink</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-93"></a><span class='hs-definition'>setHistogram</span> <span class='hs-varid'>proxy</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-varid'>int</span><span class='hs-layout'>,</span> <span class='hs-varid'>sink</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <a name="line-94"></a> <span class='hs-varid'>glHistogram</span> <a name="line-95"></a> <span class='hs-layout'>(</span><span class='hs-varid'>marshalHistogramTarget</span> <span class='hs-layout'>(</span><span class='hs-varid'>proxyToHistogramTarget</span> <span class='hs-varid'>proxy</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-96"></a> <span class='hs-varid'>w</span> <a name="line-97"></a> <span class='hs-layout'>(</span><span class='hs-varid'>marshalPixelInternalFormat'</span> <span class='hs-varid'>int</span><span class='hs-layout'>)</span> <a name="line-98"></a> <span class='hs-layout'>(</span><span class='hs-varid'>marshalSink</span> <span class='hs-varid'>sink</span><span class='hs-layout'>)</span> <a name="line-99"></a> <a name="line-100"></a><span class='hs-conid'>EXTENSION_ENTRY</span><span class='hs-layout'>(</span><span class='hs-str'>"GL_ARB_imaging"</span><span class='hs-layout'>,</span><span class='hs-varid'>glHistogram</span><span class='hs-layout'>,</span><span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLsizei</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLboolean</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <a name="line-101"></a> <a name="line-102"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-103"></a> <a name="line-104"></a><a name="getHistogram"></a><span class='hs-definition'>getHistogram</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Reset</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PixelData</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-105"></a><span class='hs-definition'>getHistogram</span> <span class='hs-varid'>reset</span> <span class='hs-varid'>pd</span> <span class='hs-keyglyph'>=</span> <a name="line-106"></a> <span class='hs-varid'>withPixelData</span> <span class='hs-varid'>pd</span> <span class='hs-varop'>$</span> <a name="line-107"></a> <span class='hs-varid'>glGetHistogram</span> <a name="line-108"></a> <span class='hs-layout'>(</span><span class='hs-varid'>marshalHistogramTarget</span> <span class='hs-conid'>Histogram</span><span class='hs-layout'>)</span> <a name="line-109"></a> <span class='hs-layout'>(</span><span class='hs-varid'>marshalReset</span> <span class='hs-varid'>reset</span><span class='hs-layout'>)</span> <a name="line-110"></a> <a name="line-111"></a><span class='hs-conid'>EXTENSION_ENTRY</span><span class='hs-layout'>(</span><span class='hs-str'>"GL_ARB_imaging"</span><span class='hs-layout'>,</span><span class='hs-varid'>glGetHistogram</span><span class='hs-layout'>,</span><span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLboolean</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</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><span class='hs-layout'>)</span> <a name="line-112"></a> <a name="line-113"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-114"></a> <a name="line-115"></a><a name="resetHistogram"></a><span class='hs-definition'>resetHistogram</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span> <a name="line-116"></a><span class='hs-definition'>resetHistogram</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>glResetHistogram</span> <span class='hs-layout'>(</span><span class='hs-varid'>marshalHistogramTarget</span> <span class='hs-conid'>Histogram</span><span class='hs-layout'>)</span> <a name="line-117"></a> <a name="line-118"></a><span class='hs-conid'>EXTENSION_ENTRY</span><span class='hs-layout'>(</span><span class='hs-str'>"GL_ARB_imaging"</span><span class='hs-layout'>,</span><span class='hs-varid'>glResetHistogram</span><span class='hs-layout'>,</span><span class='hs-conid'>GLenum</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <a name="line-119"></a> <a name="line-120"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-121"></a> <a name="line-122"></a><a name="GetHistogramParameterPName"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>GetHistogramParameterPName</span> <span class='hs-keyglyph'>=</span> <a name="line-123"></a> <span class='hs-conid'>HistogramWidth</span> <a name="line-124"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>HistogramFormat</span> <a name="line-125"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>HistogramRedSize</span> <a name="line-126"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>HistogramGreenSize</span> <a name="line-127"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>HistogramBlueSize</span> <a name="line-128"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>HistogramAlphaSize</span> <a name="line-129"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>HistogramLuminanceSize</span> <a name="line-130"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>HistogramSink</span> <a name="line-131"></a> <a name="line-132"></a><a name="marshalGetHistogramParameterPName"></a><span class='hs-definition'>marshalGetHistogramParameterPName</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GetHistogramParameterPName</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GLenum</span> <a name="line-133"></a><span class='hs-definition'>marshalGetHistogramParameterPName</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-134"></a> <span class='hs-conid'>HistogramWidth</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x8026</span> <a name="line-135"></a> <span class='hs-conid'>HistogramFormat</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x8027</span> <a name="line-136"></a> <span class='hs-conid'>HistogramRedSize</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x8028</span> <a name="line-137"></a> <span class='hs-conid'>HistogramGreenSize</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x8029</span> <a name="line-138"></a> <span class='hs-conid'>HistogramBlueSize</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x802a</span> <a name="line-139"></a> <span class='hs-conid'>HistogramAlphaSize</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x802b</span> <a name="line-140"></a> <span class='hs-conid'>HistogramLuminanceSize</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x802c</span> <a name="line-141"></a> <span class='hs-conid'>HistogramSink</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>0x802d</span> <a name="line-142"></a> <a name="line-143"></a><span class='hs-comment'>--------------------------------------------------------------------------------</span> <a name="line-144"></a> <a name="line-145"></a><a name="histogramRGBASizes"></a><span class='hs-definition'>histogramRGBASizes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Proxy</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-layout'>(</span><span class='hs-conid'>Color4</span> <span class='hs-conid'>GLsizei</span><span class='hs-layout'>)</span> <a name="line-146"></a><span class='hs-definition'>histogramRGBASizes</span> <span class='hs-varid'>proxy</span> <span class='hs-keyglyph'>=</span> <a name="line-147"></a> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <a name="line-148"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getHistogramParameteri</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>proxy</span> <span class='hs-conid'>HistogramRedSize</span> <a name="line-149"></a> <span class='hs-varid'>g</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getHistogramParameteri</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>proxy</span> <span class='hs-conid'>HistogramGreenSize</span> <a name="line-150"></a> <span class='hs-varid'>b</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getHistogramParameteri</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>proxy</span> <span class='hs-conid'>HistogramBlueSize</span> <a name="line-151"></a> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getHistogramParameteri</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>proxy</span> <span class='hs-conid'>HistogramAlphaSize</span> <a name="line-152"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Color4</span> <span class='hs-varid'>r</span> <span class='hs-varid'>g</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span> <a name="line-153"></a> <a name="line-154"></a><a name="histogramLuminanceSize"></a><span class='hs-definition'>histogramLuminanceSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Proxy</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GettableStateVar</span> <span class='hs-conid'>GLsizei</span> <a name="line-155"></a><span class='hs-definition'>histogramLuminanceSize</span> <span class='hs-varid'>proxy</span> <span class='hs-keyglyph'>=</span> <a name="line-156"></a> <span class='hs-varid'>makeGettableStateVar</span> <span class='hs-varop'>$</span> <a name="line-157"></a> <span class='hs-varid'>getHistogramParameteri</span> <span class='hs-varid'>id</span> <span class='hs-varid'>proxy</span> <span class='hs-conid'>HistogramLuminanceSize</span> </pre></body> </html>
