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<h1 class="title">glwidget.cpp Example File</h1>
<span class="subtitle">hellogl2/glwidget.cpp</span>
<!-- $$$hellogl2/glwidget.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples 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="preprocessor">#include "glwidget.h"</span>
<span class="preprocessor">#include <QMouseEvent></span>
<span class="preprocessor">#include <QOpenGLShaderProgram></span>
<span class="preprocessor">#include <QCoreApplication></span>
<span class="preprocessor">#include <math.h></span>
bool GLWidget<span class="operator">::</span>m_transparent <span class="operator">=</span> <span class="keyword">false</span>;
GLWidget<span class="operator">::</span>GLWidget(<span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="../qtwidgets/qopenglwidget.html">QOpenGLWidget</a></span>(parent)<span class="operator">,</span>
m_xRot(<span class="number">0</span>)<span class="operator">,</span>
m_yRot(<span class="number">0</span>)<span class="operator">,</span>
m_zRot(<span class="number">0</span>)<span class="operator">,</span>
m_program(<span class="number">0</span>)
{
m_core <span class="operator">=</span> <span class="type"><a href="../qtgui/qsurfaceformat.html">QSurfaceFormat</a></span><span class="operator">::</span>defaultFormat()<span class="operator">.</span>profile() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtgui/qsurfaceformat.html">QSurfaceFormat</a></span><span class="operator">::</span>CoreProfile;
<span class="comment">// --transparent causes the clear color to be transparent. Therefore, on systems that</span>
<span class="comment">// support it, the widget will become transparent apart from the logo.</span>
<span class="keyword">if</span> (m_transparent) {
<span class="type"><a href="../qtgui/qsurfaceformat.html">QSurfaceFormat</a></span> fmt <span class="operator">=</span> format();
fmt<span class="operator">.</span>setAlphaBufferSize(<span class="number">8</span>);
setFormat(fmt);
}
}
GLWidget<span class="operator">::</span><span class="operator">~</span>GLWidget()
{
cleanup();
}
<span class="type"><a href="../qtcore/qsize.html">QSize</a></span> GLWidget<span class="operator">::</span>minimumSizeHint() <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">50</span><span class="operator">,</span> <span class="number">50</span>);
}
<span class="type"><a href="../qtcore/qsize.html">QSize</a></span> GLWidget<span class="operator">::</span>sizeHint() <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">400</span><span class="operator">,</span> <span class="number">400</span>);
}
<span class="keyword">static</span> <span class="type">void</span> qNormalizeAngle(<span class="type">int</span> <span class="operator">&</span>angle)
{
<span class="keyword">while</span> (angle <span class="operator"><</span> <span class="number">0</span>)
angle <span class="operator">+</span><span class="operator">=</span> <span class="number">360</span> <span class="operator">*</span> <span class="number">16</span>;
<span class="keyword">while</span> (angle <span class="operator">></span> <span class="number">360</span> <span class="operator">*</span> <span class="number">16</span>)
angle <span class="operator">-</span><span class="operator">=</span> <span class="number">360</span> <span class="operator">*</span> <span class="number">16</span>;
}
<span class="type">void</span> GLWidget<span class="operator">::</span>setXRotation(<span class="type">int</span> angle)
{
qNormalizeAngle(angle);
<span class="keyword">if</span> (angle <span class="operator">!</span><span class="operator">=</span> m_xRot) {
m_xRot <span class="operator">=</span> angle;
<span class="keyword">emit</span> xRotationChanged(angle);
update();
}
}
<span class="type">void</span> GLWidget<span class="operator">::</span>setYRotation(<span class="type">int</span> angle)
{
qNormalizeAngle(angle);
<span class="keyword">if</span> (angle <span class="operator">!</span><span class="operator">=</span> m_yRot) {
m_yRot <span class="operator">=</span> angle;
<span class="keyword">emit</span> yRotationChanged(angle);
update();
}
}
<span class="type">void</span> GLWidget<span class="operator">::</span>setZRotation(<span class="type">int</span> angle)
{
qNormalizeAngle(angle);
<span class="keyword">if</span> (angle <span class="operator">!</span><span class="operator">=</span> m_zRot) {
m_zRot <span class="operator">=</span> angle;
<span class="keyword">emit</span> zRotationChanged(angle);
update();
}
}
<span class="type">void</span> GLWidget<span class="operator">::</span>cleanup()
{
<span class="keyword">if</span> (m_program <span class="operator">=</span><span class="operator">=</span> nullptr)
<span class="keyword">return</span>;
makeCurrent();
m_logoVbo<span class="operator">.</span>destroy();
<span class="keyword">delete</span> m_program;
m_program <span class="operator">=</span> <span class="number">0</span>;
doneCurrent();
}
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>vertexShaderSourceCore <span class="operator">=</span>
<span class="string">"#version 150\n"</span>
<span class="string">"in vec4 vertex;\n"</span>
<span class="string">"in vec3 normal;\n"</span>
<span class="string">"out vec3 vert;\n"</span>
<span class="string">"out vec3 vertNormal;\n"</span>
<span class="string">"uniform mat4 projMatrix;\n"</span>
<span class="string">"uniform mat4 mvMatrix;\n"</span>
<span class="string">"uniform mat3 normalMatrix;\n"</span>
<span class="string">"void main() {\n"</span>
<span class="string">" vert = vertex.xyz;\n"</span>
<span class="string">" vertNormal = normalMatrix * normal;\n"</span>
<span class="string">" gl_Position = projMatrix * mvMatrix * vertex;\n"</span>
<span class="string">"}\n"</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>fragmentShaderSourceCore <span class="operator">=</span>
<span class="string">"#version 150\n"</span>
<span class="string">"in highp vec3 vert;\n"</span>
<span class="string">"in highp vec3 vertNormal;\n"</span>
<span class="string">"out highp vec4 fragColor;\n"</span>
<span class="string">"uniform highp vec3 lightPos;\n"</span>
<span class="string">"void main() {\n"</span>
<span class="string">" highp vec3 L = normalize(lightPos - vert);\n"</span>
<span class="string">" highp float NL = max(dot(normalize(vertNormal), L), 0.0);\n"</span>
<span class="string">" highp vec3 color = vec3(0.39, 1.0, 0.0);\n"</span>
<span class="string">" highp vec3 col = clamp(color * 0.2 + color * 0.8 * NL, 0.0, 1.0);\n"</span>
<span class="string">" fragColor = vec4(col, 1.0);\n"</span>
<span class="string">"}\n"</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>vertexShaderSource <span class="operator">=</span>
<span class="string">"attribute vec4 vertex;\n"</span>
<span class="string">"attribute vec3 normal;\n"</span>
<span class="string">"varying vec3 vert;\n"</span>
<span class="string">"varying vec3 vertNormal;\n"</span>
<span class="string">"uniform mat4 projMatrix;\n"</span>
<span class="string">"uniform mat4 mvMatrix;\n"</span>
<span class="string">"uniform mat3 normalMatrix;\n"</span>
<span class="string">"void main() {\n"</span>
<span class="string">" vert = vertex.xyz;\n"</span>
<span class="string">" vertNormal = normalMatrix * normal;\n"</span>
<span class="string">" gl_Position = projMatrix * mvMatrix * vertex;\n"</span>
<span class="string">"}\n"</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">char</span> <span class="operator">*</span>fragmentShaderSource <span class="operator">=</span>
<span class="string">"varying highp vec3 vert;\n"</span>
<span class="string">"varying highp vec3 vertNormal;\n"</span>
<span class="string">"uniform highp vec3 lightPos;\n"</span>
<span class="string">"void main() {\n"</span>
<span class="string">" highp vec3 L = normalize(lightPos - vert);\n"</span>
<span class="string">" highp float NL = max(dot(normalize(vertNormal), L), 0.0);\n"</span>
<span class="string">" highp vec3 color = vec3(0.39, 1.0, 0.0);\n"</span>
<span class="string">" highp vec3 col = clamp(color * 0.2 + color * 0.8 * NL, 0.0, 1.0);\n"</span>
<span class="string">" gl_FragColor = vec4(col, 1.0);\n"</span>
<span class="string">"}\n"</span>;
<span class="type">void</span> GLWidget<span class="operator">::</span>initializeGL()
{
<span class="comment">// In this example the widget's corresponding top-level window can change</span>
<span class="comment">// several times during the widget's lifetime. Whenever this happens, the</span>
<span class="comment">// QOpenGLWidget's associated context is destroyed and a new one is created.</span>
<span class="comment">// Therefore we have to be prepared to clean up the resources on the</span>
<span class="comment">// aboutToBeDestroyed() signal, instead of the destructor. The emission of</span>
<span class="comment">// the signal will be followed by an invocation of initializeGL() where we</span>
<span class="comment">// can recreate all resources.</span>
connect(context()<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtgui/qopenglcontext.html">QOpenGLContext</a></span><span class="operator">::</span>aboutToBeDestroyed<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>GLWidget<span class="operator">::</span>cleanup);
initializeOpenGLFunctions();
glClearColor(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> m_transparent <span class="operator">?</span> <span class="number">0</span> : <span class="number">1</span>);
m_program <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtgui/qopenglshaderprogram.html">QOpenGLShaderProgram</a></span>;
m_program<span class="operator">-</span><span class="operator">></span>addShaderFromSourceCode(<span class="type"><a href="../qtgui/qopenglshader.html">QOpenGLShader</a></span><span class="operator">::</span>Vertex<span class="operator">,</span> m_core <span class="operator">?</span> vertexShaderSourceCore : vertexShaderSource);
m_program<span class="operator">-</span><span class="operator">></span>addShaderFromSourceCode(<span class="type"><a href="../qtgui/qopenglshader.html">QOpenGLShader</a></span><span class="operator">::</span>Fragment<span class="operator">,</span> m_core <span class="operator">?</span> fragmentShaderSourceCore : fragmentShaderSource);
m_program<span class="operator">-</span><span class="operator">></span>bindAttributeLocation(<span class="string">"vertex"</span><span class="operator">,</span> <span class="number">0</span>);
m_program<span class="operator">-</span><span class="operator">></span>bindAttributeLocation(<span class="string">"normal"</span><span class="operator">,</span> <span class="number">1</span>);
m_program<span class="operator">-</span><span class="operator">></span>link();
m_program<span class="operator">-</span><span class="operator">></span>bind();
m_projMatrixLoc <span class="operator">=</span> m_program<span class="operator">-</span><span class="operator">></span>uniformLocation(<span class="string">"projMatrix"</span>);
m_mvMatrixLoc <span class="operator">=</span> m_program<span class="operator">-</span><span class="operator">></span>uniformLocation(<span class="string">"mvMatrix"</span>);
m_normalMatrixLoc <span class="operator">=</span> m_program<span class="operator">-</span><span class="operator">></span>uniformLocation(<span class="string">"normalMatrix"</span>);
m_lightPosLoc <span class="operator">=</span> m_program<span class="operator">-</span><span class="operator">></span>uniformLocation(<span class="string">"lightPos"</span>);
<span class="comment">// Create a vertex array object. In OpenGL ES 2.0 and OpenGL 2.x</span>
<span class="comment">// implementations this is optional and support may not be present</span>
<span class="comment">// at all. Nonetheless the below code works in all cases and makes</span>
<span class="comment">// sure there is a VAO when one is needed.</span>
m_vao<span class="operator">.</span>create();
<span class="type"><a href="../qtgui/qopenglvertexarrayobject.html">QOpenGLVertexArrayObject</a></span><span class="operator">::</span>Binder vaoBinder(<span class="operator">&</span>m_vao);
<span class="comment">// Setup our vertex buffer object.</span>
m_logoVbo<span class="operator">.</span>create();
m_logoVbo<span class="operator">.</span>bind();
m_logoVbo<span class="operator">.</span>allocate(m_logo<span class="operator">.</span>constData()<span class="operator">,</span> m_logo<span class="operator">.</span>count() <span class="operator">*</span> <span class="keyword">sizeof</span>(GLfloat));
<span class="comment">// Store the vertex attribute bindings for the program.</span>
setupVertexAttribs();
<span class="comment">// Our camera never changes in this example.</span>
m_camera<span class="operator">.</span>setToIdentity();
m_camera<span class="operator">.</span>translate(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="operator">-</span><span class="number">1</span>);
<span class="comment">// Light position is fixed.</span>
m_program<span class="operator">-</span><span class="operator">></span>setUniformValue(m_lightPosLoc<span class="operator">,</span> QVector3D(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">70</span>));
m_program<span class="operator">-</span><span class="operator">></span>release();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>setupVertexAttribs()
{
m_logoVbo<span class="operator">.</span>bind();
<span class="type"><a href="../qtgui/qopenglfunctions.html">QOpenGLFunctions</a></span> <span class="operator">*</span>f <span class="operator">=</span> <span class="type"><a href="../qtgui/qopenglcontext.html">QOpenGLContext</a></span><span class="operator">::</span>currentContext()<span class="operator">-</span><span class="operator">></span>functions();
f<span class="operator">-</span><span class="operator">></span>glEnableVertexAttribArray(<span class="number">0</span>);
f<span class="operator">-</span><span class="operator">></span>glEnableVertexAttribArray(<span class="number">1</span>);
f<span class="operator">-</span><span class="operator">></span>glVertexAttribPointer(<span class="number">0</span><span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> GL_FLOAT<span class="operator">,</span> GL_FALSE<span class="operator">,</span> <span class="number">6</span> <span class="operator">*</span> <span class="keyword">sizeof</span>(GLfloat)<span class="operator">,</span> <span class="number">0</span>);
f<span class="operator">-</span><span class="operator">></span>glVertexAttribPointer(<span class="number">1</span><span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> GL_FLOAT<span class="operator">,</span> GL_FALSE<span class="operator">,</span> <span class="number">6</span> <span class="operator">*</span> <span class="keyword">sizeof</span>(GLfloat)<span class="operator">,</span> <span class="keyword">reinterpret_cast</span><span class="operator"><</span><span class="type">void</span> <span class="operator">*</span><span class="operator">></span>(<span class="number">3</span> <span class="operator">*</span> <span class="keyword">sizeof</span>(GLfloat)));
m_logoVbo<span class="operator">.</span>release();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>paintGL()
{
glClear(GL_COLOR_BUFFER_BIT <span class="operator">|</span> GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
m_world<span class="operator">.</span>setToIdentity();
m_world<span class="operator">.</span>rotate(<span class="number">180.0f</span> <span class="operator">-</span> (m_xRot <span class="operator">/</span> <span class="number">16.0f</span>)<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
m_world<span class="operator">.</span>rotate(m_yRot <span class="operator">/</span> <span class="number">16.0f</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span>);
m_world<span class="operator">.</span>rotate(m_zRot <span class="operator">/</span> <span class="number">16.0f</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>);
<span class="type"><a href="../qtgui/qopenglvertexarrayobject.html">QOpenGLVertexArrayObject</a></span><span class="operator">::</span>Binder vaoBinder(<span class="operator">&</span>m_vao);
m_program<span class="operator">-</span><span class="operator">></span>bind();
m_program<span class="operator">-</span><span class="operator">></span>setUniformValue(m_projMatrixLoc<span class="operator">,</span> m_proj);
m_program<span class="operator">-</span><span class="operator">></span>setUniformValue(m_mvMatrixLoc<span class="operator">,</span> m_camera <span class="operator">*</span> m_world);
QMatrix3x3 normalMatrix <span class="operator">=</span> m_world<span class="operator">.</span>normalMatrix();
m_program<span class="operator">-</span><span class="operator">></span>setUniformValue(m_normalMatrixLoc<span class="operator">,</span> normalMatrix);
glDrawArrays(GL_TRIANGLES<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> m_logo<span class="operator">.</span>vertexCount());
m_program<span class="operator">-</span><span class="operator">></span>release();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>resizeGL(<span class="type">int</span> w<span class="operator">,</span> <span class="type">int</span> h)
{
m_proj<span class="operator">.</span>setToIdentity();
m_proj<span class="operator">.</span>perspective(<span class="number">45.0f</span><span class="operator">,</span> GLfloat(w) <span class="operator">/</span> h<span class="operator">,</span> <span class="number">0.01f</span><span class="operator">,</span> <span class="number">100.0f</span>);
}
<span class="type">void</span> GLWidget<span class="operator">::</span>mousePressEvent(<span class="type"><a href="../qtgui/qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
m_lastPos <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos();
}
<span class="type">void</span> GLWidget<span class="operator">::</span>mouseMoveEvent(<span class="type"><a href="../qtgui/qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
<span class="type">int</span> dx <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>x() <span class="operator">-</span> m_lastPos<span class="operator">.</span>x();
<span class="type">int</span> dy <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>y() <span class="operator">-</span> m_lastPos<span class="operator">.</span>y();
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>buttons() <span class="operator">&</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>LeftButton) {
setXRotation(m_xRot <span class="operator">+</span> <span class="number">8</span> <span class="operator">*</span> dy);
setYRotation(m_yRot <span class="operator">+</span> <span class="number">8</span> <span class="operator">*</span> dx);
} <span class="keyword">else</span> <span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>buttons() <span class="operator">&</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>RightButton) {
setXRotation(m_xRot <span class="operator">+</span> <span class="number">8</span> <span class="operator">*</span> dy);
setZRotation(m_zRot <span class="operator">+</span> <span class="number">8</span> <span class="operator">*</span> dx);
}
m_lastPos <span class="operator">=</span> event<span class="operator">-</span><span class="operator">></span>pos();
}
</pre>
</div>
<!-- @@@hellogl2/glwidget.cpp -->
</div>
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d5e62c01ae8d1e579463c6a871dd44bf
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