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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 >Lit and Textured Cube Example</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#qt-quick-implementation">Qt Quick Implementation</a></li>
<li class="level2"><a href="#creating-canvas3d">Creating Canvas3D</a></li>
<li class="level2"><a href="#importing-the-javascript-file">Importing the JavaScript File</a></li>
<li class="level1"><a href="#javascript-implementation">JavaScript Implementation</a></li>
<li class="level2"><a href="#matrix-library">Matrix Library</a></li>
<li class="level2"><a href="#initializegl-function">initializeGL Function</a></li>
<li class="level2"><a href="#paintgl-function">paintGL Function</a></li>
<li class="level1"><a href="#logging">Logging</a></li>
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<h1 class="title">Lit and Textured Cube Example</h1>
<span class="subtitle"></span>
<!-- $$$textureandlight-description -->
<div class="descr"> <a name="details"></a>
<p>The Lit and Textured Cube example goes through the basics of using Qt Canvas 3D.</p>
<p class="centerAlign"><img src="images/textureandlight-example.png" alt="" /></p><a name="qt-quick-implementation"></a>
<h2 id="qt-quick-implementation">Qt Quick Implementation</h2>
<a name="creating-canvas3d"></a>
<h3 >Creating Canvas3D</h3>
<p>In <a href="qtcanvas3d-textureandlight-qml-textureandlight-main-qml.html">main.qml</a>, we add a <a href="qml-qtcanvas3d-canvas3d.html">Canvas3D</a> under the root <code>Item</code>:</p>
<pre class="qml">
<span class="type"><a href="qml-qtcanvas3d-canvas3d.html">Canvas3D</a></span> {
<span class="name">id</span>: <span class="name">canvas3d</span>
<span class="name">anchors</span>.fill:<span class="name">parent</span>
...
</pre>
<p>Inside it, we catch the <code>initializeGL</code> and <code>paintGL</code> signals to forward the initialization and rendering calls to the js object:</p>
<pre class="qml">
<span class="comment">// Emitted when one time initializations should happen</span>
<span class="name">onInitializeGL</span>: {
<span class="name">GLCode</span>.<span class="name">initializeGL</span>(<span class="name">canvas3d</span>);
}
<span class="comment">// Emitted each time Canvas3D is ready for a new frame</span>
<span class="name">onPaintGL</span>: {
<span class="name">GLCode</span>.<span class="name">paintGL</span>(<span class="name">canvas3d</span>);
}
</pre>
<a name="importing-the-javascript-file"></a>
<h3 >Importing the JavaScript File</h3>
<p>We import the JavaScript file in the QML:</p>
<pre class="qml">
import "textureandlight.js" as GLCode
</pre>
<p>In the <code>initializeGL</code> function of the JavaScript, we initialize the OpenGL state. We also create the <a href="qml-qtcanvas3d-textureimage.html">TextureImage</a> and register handlers for image load success and fail signals. If the load succeeds, the OpenGL texture is created and filled with pixel data from the loaded image.</p>
<a name="javascript-implementation"></a>
<h2 id="javascript-implementation">JavaScript Implementation</h2>
<a name="matrix-library"></a>
<h3 >Matrix Library</h3>
<p>In <a href="qtcanvas3d-textureandlight-qml-textureandlight-textureandlight-js.html">textureandlight.js</a>, we first include a fast matrix library. Using this makes it a lot easier to handle 3D math operations such as matrix transformations:</p>
<pre class="js">
<span class="name">Qt</span>.<span class="name">include</span>(<span class="string">"gl-matrix.js"</span>)
</pre>
<a name="initializegl-function"></a>
<h3 >initializeGL Function</h3>
<p>Let's take a closer look at the <code>initializeGL</code> function. It is called by <a href="qml-qtcanvas3d-canvas3d.html">Canvas3D</a> once the render node is ready.</p>
<p>First of all, we need to get a <a href="qml-qtcanvas3d-context3d.html">Context3D</a> from our <a href="qml-qtcanvas3d-canvas3d.html">Canvas3D</a>. We want a context that supports depth buffer and antialising:</p>
<pre class="js">
<span class="comment">// Get the OpenGL context object that represents the API we call</span>
<span class="name">gl</span> <span class="operator">=</span> <span class="name">canvas</span>.<span class="name">getContext</span>(<span class="string">"canvas3d"</span>, {depth:<span class="number">true</span>, antialias:<span class="number">true</span>, alpha:<span class="number">false</span>});
</pre>
<p>Then we initialize the OpenGL state for the context:</p>
<pre class="js">
<span class="comment">// Setup the OpenGL state</span>
<span class="name">gl</span>.<span class="name">enable</span>(<span class="name">gl</span>.<span class="name">DEPTH_TEST</span>);
<span class="name">gl</span>.<span class="name">depthFunc</span>(<span class="name">gl</span>.<span class="name">LESS</span>);
<span class="name">gl</span>.<span class="name">enable</span>(<span class="name">gl</span>.<span class="name">CULL_FACE</span>);
<span class="name">gl</span>.<span class="name">cullFace</span>(<span class="name">gl</span>.<span class="name">BACK</span>);
<span class="name">gl</span>.<span class="name">clearColor</span>(<span class="number">0.98</span>, <span class="number">0.98</span>, <span class="number">0.98</span>, <span class="number">1.0</span>);
<span class="name">gl</span>.<span class="name">clearDepth</span>(<span class="number">1.0</span>);
<span class="name">gl</span>.<span class="name">pixelStorei</span>(<span class="name">gl</span>.<span class="name">UNPACK_FLIP_Y_WEBGL</span>, <span class="number">false</span>);
</pre>
<p>Next, let's take a look into shader initialization in the <code>initShaders</code> function, which we call in <code>initializeGL</code>. First we define the vertex shader:</p>
<pre class="js">
var <span class="name">vertexShader</span> = <span class="name">getShader</span>(<span class="name">gl</span>,
<span class="string">"attribute highp vec3 aVertexNormal; \
attribute highp vec3 aVertexPosition; \
attribute highp vec2 aTextureCoord; \
\
uniform highp mat4 uNormalMatrix; \
uniform mat4 uMVMatrix; \
uniform mat4 uPMatrix; \
\
varying mediump vec4 vColor; \
varying highp vec2 vTextureCoord; \
varying highp vec3 vLighting; \
\
void main(void) { \
gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0); \
vTextureCoord = aTextureCoord; \
highp vec3 ambientLight = vec3(0.5, 0.5, 0.5); \
highp vec3 directionalLightColor = vec3(0.75, 0.75, 0.75); \
highp vec3 directionalVector = vec3(0.85, 0.8, 0.75); \
highp vec4 transformedNormal = uNormalMatrix * vec4(aVertexNormal, 1.0); \
highp float directional = max(dot(transformedNormal.xyz, directionalVector), 0.0); \
vLighting = ambientLight + (directionalLightColor * directional); \
}"</span>, <span class="name">gl</span>.<span class="name">VERTEX_SHADER</span>);
</pre>
<p>We follow that up by defining a fragment shader:</p>
<pre class="js">
var <span class="name">fragmentShader</span> = <span class="name">getShader</span>(<span class="name">gl</span>,
<span class="string">"varying highp vec2 vTextureCoord; \
varying highp vec3 vLighting; \
\
uniform sampler2D uSampler; \
\
void main(void) { \
mediump vec3 texelColor = texture2D(uSampler, vec2(vTextureCoord.s, vTextureCoord.t)).rgb; \
gl_FragColor = vec4(texelColor * vLighting, 1.0); \
}"</span>, <span class="name">gl</span>.<span class="name">FRAGMENT_SHADER</span>);
</pre>
<p>Then we need to create the shader program (<a href="qml-qtcanvas3d-canvas3dprogram.html">Canvas3DProgram</a>), attach the shaders to it, and then link and use the program:</p>
<pre class="js">
<span class="comment">// Create the Canvas3DProgram for shader</span>
var <span class="name">shaderProgram</span> = <span class="name">gl</span>.<span class="name">createProgram</span>();
<span class="comment">// Attach the shader sources to the shader program</span>
<span class="name">gl</span>.<span class="name">attachShader</span>(<span class="name">shaderProgram</span>, <span class="name">vertexShader</span>);
<span class="name">gl</span>.<span class="name">attachShader</span>(<span class="name">shaderProgram</span>, <span class="name">fragmentShader</span>);
<span class="comment">// Link the program</span>
<span class="name">gl</span>.<span class="name">linkProgram</span>(<span class="name">shaderProgram</span>);
<span class="comment">// Check the linking status</span>
<span class="keyword">if</span> (!<span class="name">gl</span>.<span class="name">getProgramParameter</span>(<span class="name">shaderProgram</span>, <span class="name">gl</span>.<span class="name">LINK_STATUS</span>)) {
<span class="name">console</span>.<span class="name">log</span>(<span class="string">"Could not initialise shaders"</span>);
<span class="name">console</span>.<span class="name">log</span>(<span class="name">gl</span>.<span class="name">getProgramInfoLog</span>(<span class="name">shaderProgram</span>));
}
<span class="comment">// Take the shader program into use</span>
<span class="name">gl</span>.<span class="name">useProgram</span>(<span class="name">shaderProgram</span>);
</pre>
<p>And finally, look up and store the vertex attributes and uniform locations:</p>
<pre class="js">
<span class="comment">// Look up where the vertex data needs to go</span>
<span class="name">vertexPositionAttribute</span> <span class="operator">=</span> <span class="name">gl</span>.<span class="name">getAttribLocation</span>(<span class="name">shaderProgram</span>, <span class="string">"aVertexPosition"</span>);
<span class="name">gl</span>.<span class="name">enableVertexAttribArray</span>(<span class="name">vertexPositionAttribute</span>);
<span class="name">textureCoordAttribute</span> <span class="operator">=</span> <span class="name">gl</span>.<span class="name">getAttribLocation</span>(<span class="name">shaderProgram</span>, <span class="string">"aTextureCoord"</span>);
<span class="name">gl</span>.<span class="name">enableVertexAttribArray</span>(<span class="name">textureCoordAttribute</span>);
<span class="name">vertexNormalAttribute</span> <span class="operator">=</span> <span class="name">gl</span>.<span class="name">getAttribLocation</span>(<span class="name">shaderProgram</span>, <span class="string">"aVertexNormal"</span>);
<span class="name">gl</span>.<span class="name">enableVertexAttribArray</span>(<span class="name">vertexNormalAttribute</span>);
<span class="comment">// Get the uniform locations</span>
<span class="name">pMatrixUniform</span> <span class="operator">=</span> <span class="name">gl</span>.<span class="name">getUniformLocation</span>(<span class="name">shaderProgram</span>, <span class="string">"uPMatrix"</span>);
<span class="name">mvMatrixUniform</span> <span class="operator">=</span> <span class="name">gl</span>.<span class="name">getUniformLocation</span>(<span class="name">shaderProgram</span>, <span class="string">"uMVMatrix"</span>);
<span class="name">nUniform</span> <span class="operator">=</span> <span class="name">gl</span>.<span class="name">getUniformLocation</span>(<span class="name">shaderProgram</span>, <span class="string">"uNormalMatrix"</span>);
<span class="comment">// Setup texture sampler uniform</span>
var <span class="name">textureSamplerUniform</span> = <span class="name">gl</span>.<span class="name">getUniformLocation</span>(<span class="name">shaderProgram</span>, <span class="string">"uSampler"</span>)
<span class="name">gl</span>.<span class="name">activeTexture</span>(<span class="name">gl</span>.<span class="name">TEXTURE0</span>);
<span class="name">gl</span>.<span class="name">uniform1i</span>(<span class="name">textureSamplerUniform</span>, <span class="number">0</span>);
<span class="name">gl</span>.<span class="name">bindTexture</span>(<span class="name">gl</span>.<span class="name">TEXTURE_2D</span>, <span class="number">0</span>);
</pre>
<p>After initializing the shader program, we set up the vertex buffer in <code>initBuffers</code> function. Let's look at the vertex index buffer creation as an example:</p>
<pre class="js">
var <span class="name">cubeVertexIndexBuffer</span> = <span class="name">gl</span>.<span class="name">createBuffer</span>();
<span class="name">gl</span>.<span class="name">bindBuffer</span>(<span class="name">gl</span>.<span class="name">ELEMENT_ARRAY_BUFFER</span>, <span class="name">cubeVertexIndexBuffer</span>);
<span class="name">gl</span>.<span class="name">bufferData</span>(<span class="name">gl</span>.<span class="name">ELEMENT_ARRAY_BUFFER</span>,
new <span class="name">Uint16Array</span>([
<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="comment">// front</span>
<span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">4</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="comment">// back</span>
<span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>, <span class="number">8</span>, <span class="number">10</span>, <span class="number">11</span>, <span class="comment">// top</span>
<span class="number">12</span>, <span class="number">13</span>, <span class="number">14</span>, <span class="number">12</span>, <span class="number">14</span>, <span class="number">15</span>, <span class="comment">// bottom</span>
<span class="number">16</span>, <span class="number">17</span>, <span class="number">18</span>, <span class="number">16</span>, <span class="number">18</span>, <span class="number">19</span>, <span class="comment">// right</span>
<span class="number">20</span>, <span class="number">21</span>, <span class="number">22</span>, <span class="number">20</span>, <span class="number">22</span>, <span class="number">23</span> <span class="comment">// left</span>
]),
<span class="name">gl</span>.<span class="name">STATIC_DRAW</span>);
</pre>
<p>Above, first we create the buffer, then bind it and finally insert the data into it. Other buffers are all handled in a similar fashion.</p>
<p>As the final step in <code>initializeGL</code>, we create a texture image from <a href="qml-qtcanvas3d-textureimagefactory.html">TextureImageFactory</a>, and register handlers for <code>imageLoaded</code> and <code>imageLoadingFailed</code> signals. Once the texture image is successfully loaded, we create the actual texture:</p>
<pre class="js">
<span class="name">qtLogoImage</span>.<span class="name">imageLoaded</span>.<span class="name">connect</span>(<span class="keyword">function</span>() {
<span class="name">console</span>.<span class="name">log</span>(<span class="string">"Texture loaded, "</span><span class="operator">+</span><span class="name">qtLogoImage</span>.<span class="name">src</span>);
<span class="comment">// Create the Canvas3DTexture object</span>
<span class="name">cubeTexture</span> <span class="operator">=</span> <span class="name">gl</span>.<span class="name">createTexture</span>();
<span class="comment">// Bind it</span>
<span class="name">gl</span>.<span class="name">bindTexture</span>(<span class="name">gl</span>.<span class="name">TEXTURE_2D</span>, <span class="name">cubeTexture</span>);
<span class="comment">// Set the properties</span>
<span class="name">gl</span>.<span class="name">texImage2D</span>(<span class="name">gl</span>.<span class="name">TEXTURE_2D</span>, <span class="comment">// target</span>
<span class="number">0</span>, <span class="comment">// level</span>
<span class="name">gl</span>.<span class="name">RGBA</span>, <span class="comment">// internalformat</span>
<span class="name">gl</span>.<span class="name">RGBA</span>, <span class="comment">// format</span>
<span class="name">gl</span>.<span class="name">UNSIGNED_BYTE</span>, <span class="comment">// type</span>
<span class="name">qtLogoImage</span>); <span class="comment">// pixels</span>
<span class="comment">// Set texture filtering parameters</span>
<span class="name">gl</span>.<span class="name">texParameteri</span>(<span class="name">gl</span>.<span class="name">TEXTURE_2D</span>, <span class="name">gl</span>.<span class="name">TEXTURE_MAG_FILTER</span>, <span class="name">gl</span>.<span class="name">LINEAR</span>);
<span class="name">gl</span>.<span class="name">texParameteri</span>(<span class="name">gl</span>.<span class="name">TEXTURE_2D</span>, <span class="name">gl</span>.<span class="name">TEXTURE_MIN_FILTER</span>, <span class="name">gl</span>.<span class="name">LINEAR_MIPMAP_NEAREST</span>);
<span class="comment">// Generate mipmap</span>
<span class="name">gl</span>.<span class="name">generateMipmap</span>(<span class="name">gl</span>.<span class="name">TEXTURE_2D</span>);
});
</pre>
<a name="paintgl-function"></a>
<h3 >paintGL Function</h3>
<p><code>paintGL</code> is called by <a href="qml-qtcanvas3d-canvas3d.html">Canvas3D</a> whenever it is ready to receive a new frame. Let's go through the steps that are done in each render cycle.</p>
<p>First we check if canvas has been resized or if pixel ratio has changed, and update the projection matrix if necessary:</p>
<pre class="js">
var <span class="name">pixelRatio</span> = <span class="name">canvas</span>.<span class="name">devicePixelRatio</span>;
var <span class="name">currentWidth</span> = <span class="name">canvas</span>.<span class="name">width</span> <span class="operator">*</span> <span class="name">pixelRatio</span>;
var <span class="name">currentHeight</span> = <span class="name">canvas</span>.<span class="name">height</span> <span class="operator">*</span> <span class="name">pixelRatio</span>;
<span class="keyword">if</span> (<span class="name">currentWidth</span> <span class="operator">!==</span> <span class="name">width</span> <span class="operator">||</span> <span class="name">currentHeight</span> <span class="operator">!==</span> <span class="name">height</span> ) {
<span class="name">width</span> <span class="operator">=</span> <span class="name">currentWidth</span>;
<span class="name">height</span> <span class="operator">=</span> <span class="name">currentHeight</span>;
<span class="name">gl</span>.<span class="name">viewport</span>(<span class="number">0</span>, <span class="number">0</span>, <span class="name">width</span>, <span class="name">height</span>);
<span class="name">mat4</span>.<span class="name">perspective</span>(<span class="name">pMatrix</span>, <span class="name">degToRad</span>(<span class="number">45</span>), <span class="name">width</span> <span class="operator">/</span> <span class="name">height</span>, <span class="number">0.1</span>, <span class="number">500.0</span>);
<span class="name">gl</span>.<span class="name">uniformMatrix4fv</span>(<span class="name">pMatrixUniform</span>, <span class="number">false</span>, <span class="name">pMatrix</span>);
}
</pre>
<p>Then we clear the render area using the clear color set in <code>initializeGL</code>:</p>
<pre class="js">
<span class="name">gl</span>.<span class="name">clear</span>(<span class="name">gl</span>.<span class="name">COLOR_BUFFER_BIT</span> <span class="operator">|</span> <span class="name">gl</span>.<span class="name">DEPTH_BUFFER_BIT</span>);
</pre>
<p>Next we reset the model view matrix and apply translation and rotations:</p>
<pre class="js">
<span class="name">mat4</span>.<span class="name">identity</span>(<span class="name">mvMatrix</span>);
<span class="name">mat4</span>.<span class="name">translate</span>(<span class="name">mvMatrix</span>, <span class="name">mvMatrix</span>, [(<span class="name">canvas</span>.<span class="name">yRotAnim</span> <span class="operator">-</span> <span class="number">120.0</span>) <span class="operator">/</span> <span class="number">120.0</span>,
(<span class="name">canvas</span>.<span class="name">xRotAnim</span> <span class="operator">-</span> <span class="number">60.0</span>) <span class="operator">/</span> <span class="number">50.0</span>,
-<span class="number">10.0</span>]);
<span class="name">mat4</span>.<span class="name">rotate</span>(<span class="name">mvMatrix</span>, <span class="name">mvMatrix</span>, <span class="name">degToRad</span>(<span class="name">canvas</span>.<span class="name">xRotAnim</span>), [<span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>]);
<span class="name">mat4</span>.<span class="name">rotate</span>(<span class="name">mvMatrix</span>, <span class="name">mvMatrix</span>, <span class="name">degToRad</span>(<span class="name">canvas</span>.<span class="name">yRotAnim</span>), [<span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>]);
<span class="name">mat4</span>.<span class="name">rotate</span>(<span class="name">mvMatrix</span>, <span class="name">mvMatrix</span>, <span class="name">degToRad</span>(<span class="name">canvas</span>.<span class="name">zRotAnim</span>), [<span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>]);
<span class="name">gl</span>.<span class="name">uniformMatrix4fv</span>(<span class="name">mvMatrixUniform</span>, <span class="number">false</span>, <span class="name">mvMatrix</span>);
</pre>
<p>As we have a lit cube, we invert and transpose the model view matrix to be used for lighting calculations:</p>
<pre class="js">
<span class="name">mat4</span>.<span class="name">invert</span>(<span class="name">nMatrix</span>, <span class="name">mvMatrix</span>);
<span class="name">mat4</span>.<span class="name">transpose</span>(<span class="name">nMatrix</span>, <span class="name">nMatrix</span>);
<span class="name">gl</span>.<span class="name">uniformMatrix4fv</span>(<span class="name">nUniform</span>, <span class="number">false</span>, <span class="name">nMatrix</span>);
</pre>
<p>And finally we draw the cube:</p>
<pre class="js">
<span class="name">gl</span>.<span class="name">drawElements</span>(<span class="name">gl</span>.<span class="name">TRIANGLES</span>, <span class="number">36</span>, <span class="name">gl</span>.<span class="name">UNSIGNED_SHORT</span>, <span class="number">0</span>);
</pre>
<a name="logging"></a>
<h2 id="logging">Logging</h2>
<p>Qt Canvas 3D uses Qt's categorized logging feature. This example enables all Qt Canvas 3D log output with the code shown below. For more on <a href="qml-qtcanvas3d-canvas3d.html">Canvas3D</a>'s logging features refer to <a href="qtcanvas3d-logging.html">Qt Canvas 3D Logging</a>.</p>
<pre class="cpp">
<span class="comment">// Uncomment to turn on all the logging categories of Canvas3D</span>
<span class="comment">// QString loggingFilter = QString("qt.canvas3d.info.debug=true\n");</span>
<span class="comment">// loggingFilter += QStringLiteral("qt.canvas3d.rendering.debug=true\n")</span>
<span class="comment">// + QStringLiteral("qt.canvas3d.rendering.warning=true\n")</span>
<span class="comment">// + QStringLiteral("qt.canvas3d.glerrors.debug=true");</span>
<span class="comment">// QLoggingCategory::setFilterRules(loggingFilter);</span>
</pre>
<p>Files:</p>
<ul>
<li><a href="qtcanvas3d-textureandlight-qml-textureandlight-main-qml.html">textureandlight/qml/textureandlight/main.qml</a></li>
<li><a href="qtcanvas3d-textureandlight-qml-textureandlight-textureandlight-js.html">textureandlight/qml/textureandlight/textureandlight.js</a></li>
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distrib
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Mageia
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x86_64
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media
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core-updates
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by-pkgid
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7672afc6a1c5f1f7ad2bfb0b950f0236
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files
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