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<td >Qt 5.9</td><td ><a href="qtcanvas3d-index.html">Qt Canvas 3D</a></td><td ><a href="qtcanvas3d-examples.html">Qt Canvas 3D Examples</a></td><td >Qt Quick Item as Texture Example</td></tr></table><table class="buildversion"><tr>
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<li class="level1"><a href="#using-qt-quick-item-as-a-texture">Using Qt Quick Item as a Texture</a></li>
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<h1 class="title">Qt Quick Item as Texture Example</h1>
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<p>The Qt Quick Item as Texture example shows how to use other Qt Quick items as a texture source for Qt <a href="qml-qtcanvas3d-canvas3d.html">Canvas3D</a> textures.</p>
<p class="centerAlign"><img src="images/quickitemtexture-example.png" alt="" /></p><a name="using-qt-quick-item-as-a-texture"></a>
<h2 id="using-qt-quick-item-as-a-texture">Using Qt Quick Item as a Texture</h2>
<p>First we create a Rectangle with a label that displays the current frame rate and rotation values of the cube:</p>
<pre class="qml">
<span class="type">Rectangle</span> {
<span class="name">id</span>: <span class="name">textureSource</span>
<span class="name">color</span>: <span class="string">"lightgreen"</span>
<span class="name">width</span>: <span class="number">256</span>
<span class="name">height</span>: <span class="number">256</span>
<span class="name">border</span>.color: <span class="string">"blue"</span>
<span class="name">border</span>.width: <span class="number">4</span>
<span class="name">layer</span>.enabled: <span class="number">true</span>
<span class="name">layer</span>.smooth: <span class="number">true</span>
<span class="type">Label</span> {
<span class="name">anchors</span>.fill: <span class="name">parent</span>
<span class="name">anchors</span>.margins: <span class="number">16</span>
<span class="name">text</span>: <span class="string">"X Rot:"</span> <span class="operator">+</span> (<span class="name">canvas3d</span>.<span class="name">xRotAnim</span> <span class="operator">|</span> <span class="number">0</span>) <span class="operator">+</span> <span class="string">"\n"</span>
<span class="operator">+</span> <span class="string">"Y Rot:"</span> <span class="operator">+</span> (<span class="name">canvas3d</span>.<span class="name">yRotAnim</span> <span class="operator">|</span> <span class="number">0</span>) <span class="operator">+</span> <span class="string">"\n"</span>
<span class="operator">+</span> <span class="string">"Z Rot:"</span> <span class="operator">+</span> (<span class="name">canvas3d</span>.<span class="name">zRotAnim</span> <span class="operator">|</span> <span class="number">0</span>) <span class="operator">+</span> <span class="string">"\n"</span>
<span class="operator">+</span> <span class="string">"FPS:"</span> <span class="operator">+</span> <span class="name">canvas3d</span>.<span class="name">fps</span>
<span class="name">color</span>: <span class="string">"red"</span>
<span class="name">font</span>.pointSize: <span class="number">26</span>
<span class="name">horizontalAlignment</span>: <span class="name">Text</span>.<span class="name">AlignLeft</span>
<span class="name">verticalAlignment</span>: <span class="name">Text</span>.<span class="name">AlignVCenter</span>
}
}
</pre>
<p>We want to use the above Rectangle as the texture on our 3D cube. As a Rectangle item doesn't implement QQuickItem::textureProvider() by itself, we make it layered by setting the <code>layer.enabled</code> property to <code>true</code>.</p>
<p>To create a <a href="qml-qtcanvas3d-canvas3dtexture.html">Canvas3DTexture</a> out of our layered Rectangle, we create a <a href="qml-qtcanvas3d-canvas3dtextureprovider.html">QTCANVAS3D_texture_provider</a> extension and the texture in the <code>initializeGL()</code> function in our JavaScript implementation:</p>
<pre class="js">
<span class="name">canvasTextureProvider</span> <span class="operator">=</span> <span class="name">gl</span>.<span class="name">getExtension</span>(<span class="string">"QTCANVAS3D_texture_provider"</span>);
<span class="name">cubeTexture</span> <span class="operator">=</span> <span class="name">canvasTextureProvider</span>.<span class="name">createTextureFromSource</span>(<span class="name">textureSourceItem</span>);
</pre>
<p>Once the <code>cubeTexture</code> item is created, it can be used like any other texture item in the JavaScript.</p>
<p><b>Note: </b>The method of creating the texture from a Qt Quick item differs from how one would create texture from an HTML item in WebGL API. Textures created with <a href="qml-qtcanvas3d-canvas3dtextureprovider.html">QTCANVAS3D_texture_provider</a> extension support automatic live updates, without having to call textureImage2D each frame to re-upload fresh texture data from the item.</p><p>Files:</p>
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<li><a href="qtcanvas3d-quickitemtexture-qml-quickitemtexture-main-qml.html">quickitemtexture/qml/quickitemtexture/main.qml</a></li>
<li><a href="qtcanvas3d-quickitemtexture-qml-quickitemtexture-quickitemtexture-js.html">quickitemtexture/qml/quickitemtexture/quickitemtexture.js</a></li>
<li><a href="qtcanvas3d-quickitemtexture-main-cpp.html">quickitemtexture/main.cpp</a></li>
<li><a href="qtcanvas3d-quickitemtexture-quickitemtexture-pro.html">quickitemtexture/quickitemtexture.pro</a></li>
<li><a href="qtcanvas3d-quickitemtexture-quickitemtexture-qrc.html">quickitemtexture/quickitemtexture.qrc</a></li>
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