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<h1 class="title">framebuffer.js Example File</h1>
<span class="subtitle">framebuffer/qml/framebuffer/framebuffer.js</span>
<!-- $$$framebuffer/qml/framebuffer/framebuffer.js-description -->
<div class="descr"> <a name="details"></a>
<pre class="js">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCanvas3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="name">Qt</span>.<span class="name">include</span>(<span class="string">"gl-matrix.js"</span>)
//
<span class="comment">// Draws a cube that has the Qt logo as decal texture on each face in to a texture.</span>
<span class="comment">// That texture is used as the texture for drawing another cube on the screen.</span>
//
var <span class="name">gl</span>;
var <span class="name">rttFramebuffer</span>;
var <span class="name">rttTexture</span>;
var <span class="name">rttWidth</span> = <span class="number">512</span>;
var <span class="name">rttHeight</span> = <span class="number">512</span>;
var <span class="name">cubeTexture</span> = <span class="number">0</span>;
var <span class="name">vertexPositionAttribute</span>;
var <span class="name">textureCoordAttribute</span>;
var <span class="name">vertexNormalAttribute</span>;
var <span class="name">vertexColorAttribute</span>;
var <span class="name">mvMatrix</span> = <span class="name">mat4</span>.<span class="name">create</span>();
var <span class="name">pMatrix</span> = <span class="name">mat4</span>.<span class="name">create</span>();
var <span class="name">nMatrix</span> = <span class="name">mat4</span>.<span class="name">create</span>();
var <span class="name">pMatrixUniform</span>;
var <span class="name">mvMatrixUniform</span>;
var <span class="name">nUniform</span>;
var <span class="name">canvas3d</span>;
var <span class="name">isLogEnabled</span> = <span class="number">false</span>;
<span class="keyword">function</span> <span class="name">log</span>(<span class="name">message</span>) {
<span class="keyword">if</span> (<span class="name">isLogEnabled</span>)
<span class="name">console</span>.<span class="name">log</span>(<span class="name">message</span>)
}
<span class="keyword">function</span> <span class="name">initializeGL</span>(<span class="name">canvas</span>, textureLoader) {
<span class="name">canvas3d</span> <span class="operator">=</span> <span class="name">canvas</span>
<span class="keyword">try</span> {
<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>});
<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">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">pixelStorei</span>(<span class="name">gl</span>.<span class="name">UNPACK_FLIP_Y_WEBGL</span>, <span class="number">true</span>);
<span class="comment">// Initialize the shader program</span>
<span class="name">initShaders</span>();
<span class="comment">// Initialize vertex and color buffers</span>
<span class="name">initBuffers</span>();
<span class="comment">// Load the Qt logo as texture</span>
var <span class="name">qtLogoImage</span> = <span class="name">TextureImageFactory</span>.<span class="name">newTexImage</span>();
<span class="name">qtLogoImage</span>.<span class="name">imageLoaded</span>.<span class="name">connect</span>(<span class="keyword">function</span>() {
<span class="name">cubeTexture</span> <span class="operator">=</span> <span class="name">gl</span>.<span class="name">createTexture</span>();
<span class="name">cubeTexture</span>.<span class="name">name</span> <span class="operator">=</span> <span class="string">"CubeTexture"</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="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="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="name">gl</span>.<span class="name">generateMipmap</span>(<span class="name">gl</span>.<span class="name">TEXTURE_2D</span>);
});
<span class="name">qtLogoImage</span>.<span class="name">imageLoadingFailed</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 load FAILED, "</span><span class="operator">+</span><span class="name">qtLogoImage</span>.<span class="name">errorString</span>);
});
<span class="name">qtLogoImage</span>.<span class="name">src</span> <span class="operator">=</span> <span class="string">"qrc:/qtlogo.png"</span>;
<span class="comment">// Create the framebuffer object</span>
<span class="name">rttFramebuffer</span> <span class="operator">=</span> <span class="name">gl</span>.<span class="name">createFramebuffer</span>();
<span class="name">rttFramebuffer</span>.<span class="name">name</span> <span class="operator">=</span> <span class="string">"OffscreenRenderTarget"</span>;
<span class="name">gl</span>.<span class="name">bindFramebuffer</span>(<span class="name">gl</span>.<span class="name">FRAMEBUFFER</span>, <span class="name">rttFramebuffer</span>);
<span class="comment">// Create the texture</span>
<span class="name">rttTexture</span> <span class="operator">=</span> <span class="name">gl</span>.<span class="name">createTexture</span>();
<span class="name">rttTexture</span>.<span class="name">name</span> <span class="operator">=</span> <span class="string">"OffscreenRenderTargetTexture"</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">rttTexture</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="name">gl</span>.<span class="name">texImage2D</span>(<span class="name">gl</span>.<span class="name">TEXTURE_2D</span>, <span class="number">0</span>,
<span class="name">gl</span>.<span class="name">RGBA</span>, <span class="name">rttWidth</span>, <span class="name">rttHeight</span>,
<span class="number">0</span>, <span class="name">gl</span>.<span class="name">RGBA</span>, <span class="name">gl</span>.<span class="name">UNSIGNED_BYTE</span>,
<span class="number">null</span>);
<span class="name">gl</span>.<span class="name">generateMipmap</span>(<span class="name">gl</span>.<span class="name">TEXTURE_2D</span>);
<span class="comment">// Bind the texture as color attachment, create and bind a depth buffer</span>
<span class="name">gl</span>.<span class="name">framebufferTexture2D</span>(<span class="name">gl</span>.<span class="name">FRAMEBUFFER</span>,
<span class="name">gl</span>.<span class="name">COLOR_ATTACHMENT0</span>,
<span class="name">gl</span>.<span class="name">TEXTURE_2D</span>, <span class="name">rttTexture</span>, <span class="number">0</span>);
var <span class="name">renderbuffer</span> = <span class="name">gl</span>.<span class="name">createRenderbuffer</span>();
<span class="name">gl</span>.<span class="name">bindRenderbuffer</span>(<span class="name">gl</span>.<span class="name">RENDERBUFFER</span>, <span class="name">renderbuffer</span>);
<span class="name">gl</span>.<span class="name">renderbufferStorage</span>(<span class="name">gl</span>.<span class="name">RENDERBUFFER</span>,
<span class="name">gl</span>.<span class="name">DEPTH_COMPONENT16</span>,
<span class="name">rttWidth</span>, <span class="name">rttHeight</span>);
<span class="name">gl</span>.<span class="name">framebufferRenderbuffer</span>(<span class="name">gl</span>.<span class="name">FRAMEBUFFER</span>,
<span class="name">gl</span>.<span class="name">DEPTH_ATTACHMENT</span>,
<span class="name">gl</span>.<span class="name">RENDERBUFFER</span>, <span class="name">renderbuffer</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>);
<span class="name">gl</span>.<span class="name">bindRenderbuffer</span>(<span class="name">gl</span>.<span class="name">RENDERBUFFER</span>, <span class="number">0</span>);
<span class="name">gl</span>.<span class="name">bindFramebuffer</span>(<span class="name">gl</span>.<span class="name">FRAMEBUFFER</span>, <span class="number">0</span>);
} <span class="keyword">catch</span>(<span class="name">e</span>) {
console.log("initializeGL FAILURE!");
console.log(""+e);
console.log(""+e.message);
}
}
<span class="keyword">function</span> <span class="name">degToRad</span>(<span class="name">degrees</span>) {
<span class="keyword">return</span> <span class="name">degrees</span> <span class="operator">*</span> <span class="name">Math</span>.<span class="name">PI</span> <span class="operator">/</span> <span class="number">180</span>;
}
<span class="keyword">function</span> <span class="name">paintGL</span>(<span class="name">canvas</span>) {
<span class="comment">// bind the FBO and setup viewport</span>
<span class="name">gl</span>.<span class="name">bindFramebuffer</span>(<span class="name">gl</span>.<span class="name">FRAMEBUFFER</span>, <span class="name">rttFramebuffer</span>);
<span class="name">gl</span>.<span class="name">viewport</span>(<span class="number">0</span>, <span class="number">0</span>, <span class="name">rttWidth</span>, <span class="name">rttHeight</span>);
<span class="name">gl</span>.<span class="name">clearColor</span>(<span class="number">0.95</span>, <span class="number">0.95</span>, <span class="number">0.95</span>, <span class="number">1.0</span>);
<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>);
<span class="comment">// Bind the loaded texture</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">// Calculate and set matrix uniforms</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">rttWidth</span> <span class="operator">/</span> <span class="name">rttHeight</span>, <span class="number">0.1</span>, <span class="number">100.0</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>);
<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="number">0</span>, <span class="number">0</span>, -<span class="number">5.0</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">xRotSlider</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">yRotSlider</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">zRotSlider</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>);
<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>);
<span class="comment">// Draw the cube to the FBO</span>
<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>);
<span class="comment">// Bind the render-to-texture and generate mipmaps</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">rttTexture</span>);
<span class="name">gl</span>.<span class="name">generateMipmap</span>(<span class="name">gl</span>.<span class="name">TEXTURE_2D</span>);
<span class="comment">// Bind default framebuffer and setup viewport accordingly</span>
<span class="name">gl</span>.<span class="name">bindFramebuffer</span>(<span class="name">gl</span>.<span class="name">FRAMEBUFFER</span>, <span class="number">0</span>);
<span class="name">gl</span>.<span class="name">viewport</span>(<span class="number">0</span>, <span class="number">0</span>,
<span class="name">canvas</span>.<span class="name">width</span> <span class="operator">*</span> <span class="name">canvas</span>.<span class="name">devicePixelRatio</span>,
<span class="name">canvas</span>.<span class="name">height</span> <span class="operator">*</span> <span class="name">canvas</span>.<span class="name">devicePixelRatio</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">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>);
<span class="comment">// Calculate and set matrix uniforms</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">canvas</span>.<span class="name">width</span> <span class="operator">/</span> <span class="name">canvas</span>.<span class="name">height</span>, <span class="number">0.1</span>, <span class="number">100.0</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>);
<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">gl</span>.<span class="name">uniformMatrix4fv</span>(<span class="name">mvMatrixUniform</span>, <span class="number">false</span>, <span class="name">mvMatrix</span>);
<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>);
<span class="comment">// Draw the on-screen cube</span>
<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>);
}
<span class="keyword">function</span> <span class="name">resizeGL</span>(<span class="name">canvas</span>)
{
var <span class="name">pixelRatio</span> = <span class="name">canvas</span>.<span class="name">devicePixelRatio</span>;
<span class="name">canvas</span>.<span class="name">pixelSize</span> <span class="operator">=</span> <span class="name">Qt</span>.<span class="name">size</span>(<span class="name">canvas</span>.<span class="name">width</span> <span class="operator">*</span> <span class="name">pixelRatio</span>,
<span class="name">canvas</span>.<span class="name">height</span> <span class="operator">*</span> <span class="name">pixelRatio</span>);
}
<span class="keyword">function</span> <span class="name">initBuffers</span>()
{
<span class="name">log</span>(<span class="string">" cubeVertexPositionBuffer"</span>);
var <span class="name">cubeVertexPositionBuffer</span> = <span class="name">gl</span>.<span class="name">createBuffer</span>();
<span class="name">cubeVertexPositionBuffer</span>.<span class="name">name</span> <span class="operator">=</span> <span class="string">"cubeVertexPositionBuffer"</span>;
<span class="name">gl</span>.<span class="name">bindBuffer</span>(<span class="name">gl</span>.<span class="name">ARRAY_BUFFER</span>, <span class="name">cubeVertexPositionBuffer</span>);
<span class="name">gl</span>.<span class="name">bufferData</span>(
<span class="name">gl</span>.<span class="name">ARRAY_BUFFER</span>,
new <span class="name">Float32Array</span>([<span class="comment">// Front face</span>
-<span class="number">1.0</span>, -<span class="number">1.0</span>, <span class="number">1.0</span>,
<span class="number">1.0</span>, -<span class="number">1.0</span>, <span class="number">1.0</span>,
<span class="number">1.0</span>, <span class="number">1.0</span>, <span class="number">1.0</span>,
-<span class="number">1.0</span>, <span class="number">1.0</span>, <span class="number">1.0</span>,
<span class="comment">// Back face</span>
-<span class="number">1.0</span>, -<span class="number">1.0</span>, -<span class="number">1.0</span>,
-<span class="number">1.0</span>, <span class="number">1.0</span>, -<span class="number">1.0</span>,
<span class="number">1.0</span>, <span class="number">1.0</span>, -<span class="number">1.0</span>,
<span class="number">1.0</span>, -<span class="number">1.0</span>, -<span class="number">1.0</span>,
<span class="comment">// Top face</span>
-<span class="number">1.0</span>, <span class="number">1.0</span>, -<span class="number">1.0</span>,
-<span class="number">1.0</span>, <span class="number">1.0</span>, <span class="number">1.0</span>,
<span class="number">1.0</span>, <span class="number">1.0</span>, <span class="number">1.0</span>,
<span class="number">1.0</span>, <span class="number">1.0</span>, -<span class="number">1.0</span>,
<span class="comment">// Bottom face</span>
-<span class="number">1.0</span>, -<span class="number">1.0</span>, -<span class="number">1.0</span>,
<span class="number">1.0</span>, -<span class="number">1.0</span>, -<span class="number">1.0</span>,
<span class="number">1.0</span>, -<span class="number">1.0</span>, <span class="number">1.0</span>,
-<span class="number">1.0</span>, -<span class="number">1.0</span>, <span class="number">1.0</span>,
<span class="comment">// Right face</span>
<span class="number">1.0</span>, -<span class="number">1.0</span>, -<span class="number">1.0</span>,
<span class="number">1.0</span>, <span class="number">1.0</span>, -<span class="number">1.0</span>,
<span class="number">1.0</span>, <span class="number">1.0</span>, <span class="number">1.0</span>,
<span class="number">1.0</span>, -<span class="number">1.0</span>, <span class="number">1.0</span>,
<span class="comment">// Left face</span>
-<span class="number">1.0</span>, -<span class="number">1.0</span>, -<span class="number">1.0</span>,
-<span class="number">1.0</span>, -<span class="number">1.0</span>, <span class="number">1.0</span>,
-<span class="number">1.0</span>, <span class="number">1.0</span>, <span class="number">1.0</span>,
-<span class="number">1.0</span>, <span class="number">1.0</span>, -<span class="number">1.0</span>
]),
<span class="name">gl</span>.<span class="name">STATIC_DRAW</span>);
<span class="name">gl</span>.<span class="name">enableVertexAttribArray</span>(<span class="name">vertexPositionAttribute</span>);
<span class="name">gl</span>.<span class="name">vertexAttribPointer</span>(<span class="name">vertexPositionAttribute</span>, <span class="number">3</span>, <span class="name">gl</span>.<span class="name">FLOAT</span>, <span class="number">false</span>, <span class="number">0</span>, <span class="number">0</span>);
<span class="name">log</span>(<span class="string">" cubeVertexIndexBuffer"</span>);
var <span class="name">cubeVertexIndexBuffer</span> = <span class="name">gl</span>.<span class="name">createBuffer</span>();
<span class="name">cubeVertexIndexBuffer</span>.<span class="name">name</span> <span class="operator">=</span> <span class="string">"cubeVertexIndexBuffer"</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>);
<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">log</span>(<span class="string">" cubeVerticesTextureCoordBuffer"</span>);
var <span class="name">cubeVerticesTextureCoordBuffer</span> = <span class="name">gl</span>.<span class="name">createBuffer</span>();
<span class="name">cubeVerticesTextureCoordBuffer</span>.<span class="name">name</span> <span class="operator">=</span> <span class="string">"cubeVerticesTextureCoordBuffer"</span>;
<span class="name">gl</span>.<span class="name">bindBuffer</span>(<span class="name">gl</span>.<span class="name">ARRAY_BUFFER</span>, <span class="name">cubeVerticesTextureCoordBuffer</span>);
var <span class="name">textureCoordinates</span> = [
<span class="comment">// Front</span>
<span class="number">1.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">1.0</span>,
<span class="number">1.0</span>, <span class="number">1.0</span>,
<span class="comment">// Back</span>
<span class="number">1.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">1.0</span>,
<span class="number">1.0</span>, <span class="number">1.0</span>,
<span class="comment">// Top</span>
<span class="number">1.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">1.0</span>,
<span class="number">1.0</span>, <span class="number">1.0</span>,
<span class="comment">// Bottom</span>
<span class="number">1.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">1.0</span>,
<span class="number">1.0</span>, <span class="number">1.0</span>,
<span class="comment">// Right</span>
<span class="number">1.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">1.0</span>,
<span class="number">1.0</span>, <span class="number">1.0</span>,
<span class="comment">// Left</span>
<span class="number">1.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">1.0</span>,
<span class="number">1.0</span>, <span class="number">1.0</span>
];
<span class="name">gl</span>.<span class="name">bufferData</span>(<span class="name">gl</span>.<span class="name">ARRAY_BUFFER</span>, new <span class="name">Float32Array</span>(<span class="name">textureCoordinates</span>),
<span class="name">gl</span>.<span class="name">STATIC_DRAW</span>);
<span class="name">gl</span>.<span class="name">enableVertexAttribArray</span>(<span class="name">textureCoordAttribute</span>);
<span class="name">gl</span>.<span class="name">vertexAttribPointer</span>(<span class="name">textureCoordAttribute</span>, <span class="number">2</span>, <span class="name">gl</span>.<span class="name">FLOAT</span>, <span class="number">false</span>, <span class="number">0</span>, <span class="number">0</span>);
var <span class="name">cubeVerticesNormalBuffer</span> = <span class="name">gl</span>.<span class="name">createBuffer</span>();
<span class="name">cubeVerticesNormalBuffer</span>.<span class="name">name</span> <span class="operator">=</span> <span class="string">"cubeVerticesNormalBuffer"</span>;
<span class="name">gl</span>.<span class="name">bindBuffer</span>(<span class="name">gl</span>.<span class="name">ARRAY_BUFFER</span>, <span class="name">cubeVerticesNormalBuffer</span>);
<span class="name">gl</span>.<span class="name">bufferData</span>(<span class="name">gl</span>.<span class="name">ARRAY_BUFFER</span>, new <span class="name">Float32Array</span>([
<span class="comment">// Front</span>
<span class="number">0.0</span>, <span class="number">0.0</span>, <span class="number">1.0</span>,
<span class="number">0.0</span>, <span class="number">0.0</span>, <span class="number">1.0</span>,
<span class="number">0.0</span>, <span class="number">0.0</span>, <span class="number">1.0</span>,
<span class="number">0.0</span>, <span class="number">0.0</span>, <span class="number">1.0</span>,
<span class="comment">// Back</span>
<span class="number">0.0</span>, <span class="number">0.0</span>, -<span class="number">1.0</span>,
<span class="number">0.0</span>, <span class="number">0.0</span>, -<span class="number">1.0</span>,
<span class="number">0.0</span>, <span class="number">0.0</span>, -<span class="number">1.0</span>,
<span class="number">0.0</span>, <span class="number">0.0</span>, -<span class="number">1.0</span>,
<span class="comment">// Top</span>
<span class="number">0.0</span>, <span class="number">1.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">1.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">1.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, <span class="number">1.0</span>, <span class="number">0.0</span>,
<span class="comment">// Bottom</span>
<span class="number">0.0</span>, -<span class="number">1.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, -<span class="number">1.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, -<span class="number">1.0</span>, <span class="number">0.0</span>,
<span class="number">0.0</span>, -<span class="number">1.0</span>, <span class="number">0.0</span>,
<span class="comment">// Right</span>
<span class="number">1.0</span>, <span class="number">0.0</span>, <span class="number">0.0</span>,
<span class="number">1.0</span>, <span class="number">0.0</span>, <span class="number">0.0</span>,
<span class="number">1.0</span>, <span class="number">0.0</span>, <span class="number">0.0</span>,
<span class="number">1.0</span>, <span class="number">0.0</span>, <span class="number">0.0</span>,
<span class="comment">// Left</span>
-<span class="number">1.0</span>, <span class="number">0.0</span>, <span class="number">0.0</span>,
-<span class="number">1.0</span>, <span class="number">0.0</span>, <span class="number">0.0</span>,
-<span class="number">1.0</span>, <span class="number">0.0</span>, <span class="number">0.0</span>,
-<span class="number">1.0</span>, <span class="number">0.0</span>, <span class="number">0.0</span>
]), <span class="name">gl</span>.<span class="name">STATIC_DRAW</span>);
<span class="name">gl</span>.<span class="name">bindBuffer</span>(<span class="name">gl</span>.<span class="name">ARRAY_BUFFER</span>, <span class="name">cubeVerticesNormalBuffer</span>);
<span class="name">gl</span>.<span class="name">vertexAttribPointer</span>(<span class="name">vertexNormalAttribute</span>, <span class="number">3</span>, <span class="name">gl</span>.<span class="name">FLOAT</span>, <span class="number">false</span>, <span class="number">0</span>, <span class="number">0</span>);
}
<span class="keyword">function</span> <span class="name">initShaders</span>()
{
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>);
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>);
var <span class="name">shaderProgram</span> = <span class="name">gl</span>.<span class="name">createProgram</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="name">gl</span>.<span class="name">linkProgram</span>(<span class="name">shaderProgram</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="name">gl</span>.<span class="name">useProgram</span>(<span class="name">shaderProgram</span>);
<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="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>);
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="keyword">function</span> <span class="name">getShader</span>(<span class="name">gl</span>, str, type) {
var <span class="name">shader</span> = <span class="name">gl</span>.<span class="name">createShader</span>(<span class="name">type</span>);
<span class="name">gl</span>.<span class="name">shaderSource</span>(<span class="name">shader</span>, <span class="name">str</span>);
<span class="name">gl</span>.<span class="name">compileShader</span>(<span class="name">shader</span>);
<span class="keyword">if</span> (!<span class="name">gl</span>.<span class="name">getShaderParameter</span>(<span class="name">shader</span>, <span class="name">gl</span>.<span class="name">COMPILE_STATUS</span>)) {
<span class="name">console</span>.<span class="name">log</span>(<span class="string">"JS:Shader compile failed"</span>);
<span class="name">console</span>.<span class="name">log</span>(<span class="name">gl</span>.<span class="name">getShaderInfoLog</span>(<span class="name">shader</span>));
<span class="keyword">return</span> <span class="number">null</span>;
}
<span class="keyword">return</span> <span class="name">shader</span>;
}
</pre>
</div>
<!-- @@@framebuffer/qml/framebuffer/framebuffer.js -->
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</div>
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<p>
<acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property
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distrib
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Mageia
>
6
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x86_64
>
media
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core-updates
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by-pkgid
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