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<title>QMultiSampleAntiAliasing Class | Qt 3D 5.12.2</title>
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<td >Qt 5.12</td><td ><a href="qt3d-index.html">Qt 3D</a></td><td ><a href="qt3d-cpp.html">C++ Classes</a></td><td >QMultiSampleAntiAliasing</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qt3d-index.html">Qt 5.12.2 Reference Documentation</a></td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#static-public-members">Static Public Members</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QMultiSampleAntiAliasing Class</h1>
<span class="small-subtitle">(<a href="qt3drender-qmultisampleantialiasing.html">Qt3DRender::QMultiSampleAntiAliasing</a>)<br/></span>
<!-- $$$QMultiSampleAntiAliasing-brief -->
<p>Enable multisample antialiasing. <a href="#details">More...</a></p>
<!-- @@@QMultiSampleAntiAliasing -->
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QMultiSampleAntiAliasing></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += 3drender</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 5.7</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Instantiated By:</td><td class="memItemRight bottomAlign"> <a href="qml-qt3d-render-multisampleantialiasing.html">MultiSampleAntiAliasing</a></td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qt3drender-qrenderstate.html">Qt3DRender::QRenderState</a></td></tr></table></div><ul>
<li><a href="qt3drender-qmultisampleantialiasing-members.html">List of all members, including inherited members</a></li>
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<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qt3drender-qmultisampleantialiasing.html#QMultiSampleAntiAliasing">QMultiSampleAntiAliasing</a></b>(Qt3DCore::QNode *<i>parent</i> = nullptr)</td></tr>
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<li class="fn">13 public functions inherited from <a href="qt3dcore-qnode.html#public-functions">Qt3DCore::QNode</a></li>
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<h2 id="static-public-members">Static Public Members</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> const QMetaObject </td><td class="memItemRight bottomAlign"><b><a href="qt3drender-qmultisampleantialiasing.html#staticMetaObject-var">staticMetaObject</a></b></td></tr>
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<h3>Additional Inherited Members</h3>
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<li class="fn">3 properties inherited from <a href="qt3dcore-qnode.html#properties">Qt3DCore::QNode</a></li>
<li class="fn">3 public slots inherited from <a href="qt3dcore-qnode.html#public-slots">Qt3DCore::QNode</a></li>
<li class="fn">4 signals inherited from <a href="qt3dcore-qnode.html#signals">Qt3DCore::QNode</a></li>
<li class="fn">2 protected functions inherited from <a href="qt3dcore-qnode.html#protected-functions">Qt3DCore::QNode</a></li>
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<a name="details"></a>
<!-- $$$QMultiSampleAntiAliasing-description -->
<div class="descr">
<h2 id="details">Detailed Description</h2>
<p>Enable multisample antialiasing.</p>
<p>A <a href="qt3drender-qmultisampleantialiasing.html">Qt3DRender::QMultiSampleAntiAliasing</a> class enables multisample antialiasing.</p>
<p>It can be added to a <a href="qt3drender-qrenderpass.html">QRenderPass</a> by calling <a href="qt3drender-qrenderpass.html#addRenderState">QRenderPass::addRenderState</a>():</p>
<pre class="cpp">
<span class="type"><a href="qt3drender-qrenderpass.html">QRenderPass</a></span> <span class="operator">*</span>renderPass <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qt3drender-qrenderpass.html">QRenderPass</a></span>();
<span class="type"><a href="qt3drender-qmultisampleantialiasing.html#QMultiSampleAntiAliasing">QMultiSampleAntiAliasing</a></span> <span class="operator">*</span>msaa <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qt3drender-qmultisampleantialiasing.html#QMultiSampleAntiAliasing">QMultiSampleAntiAliasing</a></span>();
renderPass<span class="operator">-</span><span class="operator">></span>addRenderState(msaa);
</pre>
<p>Or a <a href="qt3drender-qrenderstateset.html">QRenderStateSet</a> by calling <a href="qt3drender-qrenderstateset.html#addRenderState">QRenderStateSet::addRenderState</a>():</p>
<pre class="cpp">
<span class="type"><a href="qt3drender-qrenderstateset.html">QRenderStateSet</a></span> <span class="operator">*</span>renderStateSet <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qt3drender-qrenderstateset.html">QRenderStateSet</a></span>();
<span class="type"><a href="qt3drender-qmultisampleantialiasing.html#QMultiSampleAntiAliasing">QMultiSampleAntiAliasing</a></span> <span class="operator">*</span>msaa <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qt3drender-qmultisampleantialiasing.html#QMultiSampleAntiAliasing">QMultiSampleAntiAliasing</a></span>();
renderStateSet<span class="operator">-</span><span class="operator">></span>addRenderState(msaa);
</pre>
<p>For multisampling to take effect, the render target must have been allocated with multisampling enabled:</p>
<pre class="cpp">
QTexture2DMultisample <span class="operator">*</span>colorTex <span class="operator">=</span> <span class="keyword">new</span> QTexture2DMultisample;
colorTex<span class="operator">-</span><span class="operator">></span>setFormat(<span class="type"><a href="qt3drender-qabstracttexture.html">QAbstractTexture</a></span><span class="operator">::</span>RGBA8_UNorm);
colorTex<span class="operator">-</span><span class="operator">></span>setWidth(<span class="number">1024</span>);
colorTex<span class="operator">-</span><span class="operator">></span>setHeight(<span class="number">1024</span>);
<span class="type"><a href="qt3drender-qrendertargetoutput.html">QRenderTargetOutput</a></span> <span class="operator">*</span>color <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qt3drender-qrendertargetoutput.html">QRenderTargetOutput</a></span>;
color<span class="operator">-</span><span class="operator">></span>setAttachmentPoint(<span class="type"><a href="qt3drender-qrendertargetoutput.html">QRenderTargetOutput</a></span><span class="operator">::</span>Color0);
color<span class="operator">-</span><span class="operator">></span>setTexture(colorTex);
QTexture2DMultisample <span class="operator">*</span>depthStencilTex <span class="operator">=</span> <span class="keyword">new</span> QTexture2DMultisample;
depthStencilTex<span class="operator">-</span><span class="operator">></span>setFormat(<span class="type"><a href="qt3drender-qabstracttexture.html">QAbstractTexture</a></span><span class="operator">::</span>RGBA8_UNorm);
depthStencilTex<span class="operator">-</span><span class="operator">></span>setWidth(<span class="number">1024</span>);
depthStencilTex<span class="operator">-</span><span class="operator">></span>setHeight(<span class="number">1024</span>);
<span class="type"><a href="qt3drender-qrendertargetoutput.html">QRenderTargetOutput</a></span> <span class="operator">*</span>depthStencil <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qt3drender-qrendertargetoutput.html">QRenderTargetOutput</a></span>;
depthStencil<span class="operator">-</span><span class="operator">></span>setAttachmentPoint(<span class="type"><a href="qt3drender-qrendertargetoutput.html">QRenderTargetOutput</a></span><span class="operator">::</span>DepthStencil);
depthStencil<span class="operator">-</span><span class="operator">></span>setTexture(depthStencilTex);
<span class="type">Qt3DRender</span><span class="operator">::</span><span class="type"><a href="qt3drender-qrendertarget.html">QRenderTarget</a></span> <span class="operator">*</span>renderTarget <span class="operator">=</span> <span class="keyword">new</span> <span class="type">Qt3DRender</span><span class="operator">::</span><span class="type"><a href="qt3drender-qrendertarget.html">QRenderTarget</a></span>;
renderTarget<span class="operator">-</span><span class="operator">></span>addOutput(color);
renderTarget<span class="operator">-</span><span class="operator">></span>addOutput(depthStencil);
</pre>
<p>Further, the shader code must use multisampling sampler types and texelFetch() instead of texture().</p>
<p>For example, if you have code like</p>
<pre class="cpp plain">
#version 150
uniform sampler2D colorTexture;
in vec2 texCoord;
out vec4 fragColor;
void main()
{
fragColor = texture(colorTexture, texCoord);
}
</pre>
<p>you can rewrite it as</p>
<pre class="cpp">
<span class="preprocessor">#version 150</span>
uniform sampler2DMS colorTexture;
in vec2 texCoord;
out vec4 fragColor;
<span class="type">void</span> main()
{
ivec2 tc <span class="operator">=</span> ivec2(floor(textureSize(colorTexture) <span class="operator">*</span> texCoord));
vec4 c <span class="operator">=</span> texelFetch(colorTexture<span class="operator">,</span> tc<span class="operator">,</span> <span class="number">0</span>) <span class="operator">+</span>
texelFetch(colorTexture<span class="operator">,</span> tc<span class="operator">,</span> <span class="number">1</span>) <span class="operator">+</span>
texelFetch(colorTexture<span class="operator">,</span> tc<span class="operator">,</span> <span class="number">2</span>) <span class="operator">+</span>
texelFetch(colorTexture<span class="operator">,</span> tc<span class="operator">,</span> <span class="number">3</span>);
fragColor <span class="operator">=</span> c <span class="operator">/</span> <span class="number">4.0</span>;
}
</pre>
<p><b>Note: </b>When using OpenGL as the graphics API, glEnable(GL_MULTISAMPLE) will be called if <a href="qt3drender-qmultisampleantialiasing.html">QMultiSampleAntiAliasing</a> has been added to the render states.</p></div>
<!-- @@@QMultiSampleAntiAliasing -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QMultiSampleAntiAliasing[overload1]$$$QMultiSampleAntiAliasingQt3DCore::QNode* -->
<h3 class="fn" id="QMultiSampleAntiAliasing"><a name="QMultiSampleAntiAliasing"></a>QMultiSampleAntiAliasing::<span class="name">QMultiSampleAntiAliasing</span>(<span class="type"><a href="qt3dcore-qnode.html">Qt3DCore::QNode</a></span> *<i>parent</i> = nullptr)</h3>
<p>The constructor creates a new <a href="qt3drender-qmultisampleantialiasing.html">QMultiSampleAntiAliasing::QMultiSampleAntiAliasing</a> instance with the specified <i>parent</i>.</p>
<!-- @@@QMultiSampleAntiAliasing -->
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