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<td >Qt 5.12</td><td ><a href="qtcanvas3d-index.html">Qt Canvas 3D (deprecated)</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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<h3><a name="toc">Contents</a></h3>
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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>A simple cube with a Qt Quick item as a texture.</p>
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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 Canvas3D 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">
Rectangle {
id: textureSource
color: "lightgreen"
width: 256
height: 256
border.color: "blue"
border.width: 4
layer.enabled: true
layer.smooth: true
Label {
anchors.fill: parent
anchors.margins: 16
text: "X Rot:" + (canvas3d.xRotAnim | 0) + "\n"
+ "Y Rot:" + (canvas3d.yRotAnim | 0) + "\n"
+ "Z Rot:" + (canvas3d.zRotAnim | 0) + "\n"
+ "FPS:" + canvas3d.fps
color: "red"
font.pointSize: 26
horizontalAlignment: Text.AlignLeft
verticalAlignment: Text.AlignVCenter
}
}
</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 Canvas3DTexture 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">
canvasTextureProvider = gl.getExtension("QTCANVAS3D_texture_provider");
cubeTexture = canvasTextureProvider.createTextureFromSource(textureSourceItem);
</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>
<ul>
<li><a href="qtcanvas3d-quickitemtexture-main-cpp.html">quickitemtexture/main.cpp</a></li>
<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-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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