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threadedqopenglwidget example: Split out class Renderer

Browse Source 
This makes the code clearer and decouples it from the
GLWidget.

As a drive-by, add a global shortcut to close.

Pick-to: 6.3 6.2
Change-Id: I3469d29bc367acc17c5f8acf9d46219259b8315b
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
This commit is contained in:
Friedemann Kleint 2022-01-24 16:38:02 +01:00
parent 2d95b75345
commit f172b964f6
9 changed files with 441 additions and 310 deletions
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1
examples/opengl/threadedqopenglwidget/CMakeLists.txt
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@ -12,6 +12,7 @@ set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/opengl/threadedqopenglwidget")
find_package(Qt6 REQUIRED COMPONENTS Core Gui OpenGL OpenGLWidgets Widgets)
qt_add_executable(threadedqopenglwidget
renderer.cpp renderer.h
glwidget.cpp glwidget.h
main.cpp
mainwindow.cpp mainwindow.h

255
examples/opengl/threadedqopenglwidget/glwidget.cpp
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@ -1,6 +1,6 @@
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2022 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
@ -49,6 +49,8 @@
****************************************************************************/
#include "glwidget.h"
#include "renderer.h"
#include <qmath.h>
#include <QGuiApplication>
@ -114,254 +116,3 @@ void GLWidget::grabContext()
m_renderer->grabCond()->wakeAll();
m_renderer->unlockRenderer();
}
Renderer::Renderer(GLWidget *w) : m_glwidget(w) {}
void Renderer::paintQtLogo()
{
vbo.bind();
program.setAttributeBuffer(vertexAttr, GL_FLOAT, 0, 3);
program.setAttributeBuffer(normalAttr, GL_FLOAT, vertices.count() * 3 * sizeof(GLfloat), 3);
vbo.release();
program.enableAttributeArray(vertexAttr);
program.enableAttributeArray(normalAttr);
glDrawArrays(GL_TRIANGLES, 0, vertices.size());
program.disableAttributeArray(normalAttr);
program.disableAttributeArray(vertexAttr);
}
// Some OpenGL implementations have serious issues with compiling and linking
// shaders on multiple threads concurrently. Avoid this.
Q_GLOBAL_STATIC(QMutex, initMutex)
void Renderer::render()
{
if (m_exiting)
return;
QOpenGLContext *ctx = m_glwidget->context();
if (!ctx) // QOpenGLWidget not yet initialized
return;
// Grab the context.
m_grabMutex.lock();
emit contextWanted();
m_grabCond.wait(&m_grabMutex);
QMutexLocker lock(&m_renderMutex);
m_grabMutex.unlock();
if (m_exiting)
return;
Q_ASSERT(ctx->thread() == QThread::currentThread());
// Make the context (and an offscreen surface) current for this thread. The
// QOpenGLWidget's fbo is bound in the context.
m_glwidget->makeCurrent();
if (!m_inited) {
m_inited = true;
initializeOpenGLFunctions();
QMutexLocker initLock(initMutex());
QOpenGLShader *vshader = new QOpenGLShader(QOpenGLShader::Vertex, this);
const char *vsrc =
"attribute highp vec4 vertex;\n"
"attribute mediump vec3 normal;\n"
"uniform mediump mat4 matrix;\n"
"varying mediump vec4 color;\n"
"void main(void)\n"
"{\n"
" vec3 toLight = normalize(vec3(0.0, 0.3, 1.0));\n"
" float angle = max(dot(normal, toLight), 0.0);\n"
" vec3 col = vec3(0.40, 1.0, 0.0);\n"
" color = vec4(col * 0.2 + col * 0.8 * angle, 1.0);\n"
" color = clamp(color, 0.0, 1.0);\n"
" gl_Position = matrix * vertex;\n"
"}\n";
vshader->compileSourceCode(vsrc);
QOpenGLShader *fshader = new QOpenGLShader(QOpenGLShader::Fragment, this);
const char *fsrc =
"varying mediump vec4 color;\n"
"void main(void)\n"
"{\n"
" gl_FragColor = color;\n"
"}\n";
fshader->compileSourceCode(fsrc);
program.addShader(vshader);
program.addShader(fshader);
program.link();
vertexAttr = program.attributeLocation("vertex");
normalAttr = program.attributeLocation("normal");
matrixUniform = program.uniformLocation("matrix");
m_fAngle = 0;
m_fScale = 1;
createGeometry();
vbo.create();
vbo.bind();
const int verticesSize = vertices.count() * 3 * sizeof(GLfloat);
vbo.allocate(verticesSize * 2);
vbo.write(0, vertices.constData(), verticesSize);
vbo.write(verticesSize, normals.constData(), verticesSize);
m_elapsed.start();
}
//qDebug("%p elapsed %lld", QThread::currentThread(), m_elapsed.restart());
glClearColor(0.1f, 0.2f, 0.2f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glFrontFace(GL_CW);
glCullFace(GL_FRONT);
glEnable(GL_CULL_FACE);
glEnable(GL_DEPTH_TEST);
QMatrix4x4 modelview;
modelview.rotate(m_fAngle, 0.0f, 1.0f, 0.0f);
modelview.rotate(m_fAngle, 1.0f, 0.0f, 0.0f);
modelview.rotate(m_fAngle, 0.0f, 0.0f, 1.0f);
modelview.scale(m_fScale);
modelview.translate(0.0f, -0.2f, 0.0f);
program.bind();
program.setUniformValue(matrixUniform, modelview);
paintQtLogo();
program.release();
glDisable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
m_fAngle += 1.0f;
// Make no context current on this thread and move the QOpenGLWidget's
// context back to the gui thread.
m_glwidget->doneCurrent();
ctx->moveToThread(qGuiApp->thread());
// Schedule composition. Note that this will use QueuedConnection, meaning
// that update() will be invoked on the gui thread.
QMetaObject::invokeMethod(m_glwidget, "update");
}
void Renderer::createGeometry()
{
vertices.clear();
normals.clear();
qreal x1 = +0.06f;
qreal y1 = -0.14f;
qreal x2 = +0.14f;
qreal y2 = -0.06f;
qreal x3 = +0.08f;
qreal y3 = +0.00f;
qreal x4 = +0.30f;
qreal y4 = +0.22f;
quad(x1, y1, x2, y2, y2, x2, y1, x1);
quad(x3, y3, x4, y4, y4, x4, y3, x3);
extrude(x1, y1, x2, y2);
extrude(x2, y2, y2, x2);
extrude(y2, x2, y1, x1);
extrude(y1, x1, x1, y1);
extrude(x3, y3, x4, y4);
extrude(x4, y4, y4, x4);
extrude(y4, x4, y3, x3);
const int NumSectors = 100;
const qreal sectorAngle = 2 * qreal(M_PI) / NumSectors;
for (int i = 0; i < NumSectors; ++i) {
qreal angle = i * sectorAngle;
qreal x5 = 0.30 * sin(angle);
qreal y5 = 0.30 * cos(angle);
qreal x6 = 0.20 * sin(angle);
qreal y6 = 0.20 * cos(angle);
angle += sectorAngle;
qreal x7 = 0.20 * sin(angle);
qreal y7 = 0.20 * cos(angle);
qreal x8 = 0.30 * sin(angle);
qreal y8 = 0.30 * cos(angle);
quad(x5, y5, x6, y6, x7, y7, x8, y8);
extrude(x6, y6, x7, y7);
extrude(x8, y8, x5, y5);
}
for (int i = 0;i < vertices.size();i++)
vertices[i] *= 2.0f;
}
void Renderer::quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4)
{
vertices << QVector3D(x1, y1, -0.05f);
vertices << QVector3D(x2, y2, -0.05f);
vertices << QVector3D(x4, y4, -0.05f);
vertices << QVector3D(x3, y3, -0.05f);
vertices << QVector3D(x4, y4, -0.05f);
vertices << QVector3D(x2, y2, -0.05f);
QVector3D n = QVector3D::normal
(QVector3D(x2 - x1, y2 - y1, 0.0f), QVector3D(x4 - x1, y4 - y1, 0.0f));
normals << n;
normals << n;
normals << n;
normals << n;
normals << n;
normals << n;
vertices << QVector3D(x4, y4, 0.05f);
vertices << QVector3D(x2, y2, 0.05f);
vertices << QVector3D(x1, y1, 0.05f);
vertices << QVector3D(x2, y2, 0.05f);
vertices << QVector3D(x4, y4, 0.05f);
vertices << QVector3D(x3, y3, 0.05f);
n = QVector3D::normal
(QVector3D(x2 - x4, y2 - y4, 0.0f), QVector3D(x1 - x4, y1 - y4, 0.0f));
normals << n;
normals << n;
normals << n;
normals << n;
normals << n;
normals << n;
}
void Renderer::extrude(qreal x1, qreal y1, qreal x2, qreal y2)
{
vertices << QVector3D(x1, y1, +0.05f);
vertices << QVector3D(x2, y2, +0.05f);
vertices << QVector3D(x1, y1, -0.05f);
vertices << QVector3D(x2, y2, -0.05f);
vertices << QVector3D(x1, y1, -0.05f);
vertices << QVector3D(x2, y2, +0.05f);
QVector3D n = QVector3D::normal
(QVector3D(x2 - x1, y2 - y1, 0.0f), QVector3D(0.0f, 0.0f, -0.1f));
normals << n;
normals << n;
normals << n;
normals << n;
normals << n;
normals << n;
}

57
examples/opengl/threadedqopenglwidget/glwidget.h
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@ -1,6 +1,6 @@
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2022 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
@ -52,59 +52,10 @@
#define GLWIDGET_H
#include <QOpenGLWidget>
#include <QOpenGLFunctions>
#include <QOpenGLShaderProgram>
#include <QOpenGLBuffer>
#include <QVector3D>
#include <QMatrix4x4>
#include <QThread>
#include <QMutex>
#include <QWaitCondition>
#include <QElapsedTimer>
class GLWidget;
QT_FORWARD_DECLARE_CLASS(QThread)
class Renderer : public QObject, protected QOpenGLFunctions
{
Q_OBJECT
public:
Renderer(GLWidget *w);
void lockRenderer() { m_renderMutex.lock(); }
void unlockRenderer() { m_renderMutex.unlock(); }
QMutex *grabMutex() { return &m_grabMutex; }
QWaitCondition *grabCond() { return &m_grabCond; }
void prepareExit() { m_exiting = true; m_grabCond.wakeAll(); }
signals:
void contextWanted();
public slots:
void render();
private:
void paintQtLogo();
void createGeometry();
void quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4);
void extrude(qreal x1, qreal y1, qreal x2, qreal y2);
bool m_inited = false;
qreal m_fAngle = 0;
qreal m_fScale = 1;
QList<QVector3D> vertices;
QList<QVector3D> normals;
QOpenGLShaderProgram program;
QOpenGLBuffer vbo;
int vertexAttr = 0;
int normalAttr = 0;
int matrixUniform = 0;
GLWidget *m_glwidget = nullptr;
QMutex m_renderMutex;
QElapsedTimer m_elapsed;
QMutex m_grabMutex;
QWaitCondition m_grabCond;
bool m_exiting = false;
};
class Renderer;
class GLWidget : public QOpenGLWidget
{
@ -133,4 +84,4 @@ private:
Renderer *m_renderer;
};
#endif
#endif // GLWIDGET_H

6
examples/opengl/threadedqopenglwidget/main.cpp
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@ -1,6 +1,6 @@
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2022 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
@ -51,8 +51,10 @@
#include <QApplication>
#include <QMainWindow>
#include <QScreen>
#include <QShortcut>
#include <QSurfaceFormat>
#include <QOpenGLContext>
#include <QOpenGLFunctions>
#include <QCommandLineParser>
#include <QCommandLineOption>
#include "mainwindow.h"
@ -95,6 +97,8 @@ int main( int argc, char ** argv )
topLevelGlWidget.resize(200, 200);
topLevelGlWidget.move(pos);
topLevelGlWidget.show();
auto *closeShortcut = new QShortcut(Qt::CTRL | Qt::Key_Q, &a, QApplication::closeAllWindows);
closeShortcut->setContext(Qt::ApplicationShortcut);
const QString glInfo = getGlString(topLevelGlWidget.context()->functions(), GL_VENDOR)
+ QLatin1Char('/') + getGlString(topLevelGlWidget.context()->functions(), GL_RENDERER);

2
examples/opengl/threadedqopenglwidget/mainwindow.cpp
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@ -1,6 +1,6 @@
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2022 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.

2
examples/opengl/threadedqopenglwidget/mainwindow.h
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@ -1,6 +1,6 @@
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2022 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.

314
examples/opengl/threadedqopenglwidget/renderer.cpp Normal file
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@ -0,0 +1,314 @@
/****************************************************************************
**
** Copyright (C) 2022 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "renderer.h"
#include <qmath.h>
#include <QOpenGLWidget>
#include <QGuiApplication>
static const char VERTEX_SHADER[] = R"(attribute highp vec4 vertex;
attribute mediump vec3 normal;
uniform mediump mat4 matrix;
varying mediump vec4 color;
void main(void)
{
vec3 toLight = normalize(vec3(0.0, 0.3, 1.0));
float angle = max(dot(normal, toLight), 0.0);
vec3 col = vec3(0.40, 1.0, 0.0);
color = vec4(col * 0.2 + col * 0.8 * angle, 1.0);
color = clamp(color, 0.0, 1.0);
gl_Position = matrix * vertex;
}
)";
static const char FRAGMENT_SHADER[] = R"(varying mediump vec4 color;
void main(void)
{
gl_FragColor = color;
}
)";
Renderer::Renderer(QOpenGLWidget *w) :
m_glwidget(w)
{
}
void Renderer::paintQtLogo()
{
vbo.bind();
program.setAttributeBuffer(vertexAttr, GL_FLOAT, 0, 3);
program.setAttributeBuffer(normalAttr, GL_FLOAT, vertices.count() * 3 * sizeof(GLfloat), 3);
vbo.release();
program.enableAttributeArray(vertexAttr);
program.enableAttributeArray(normalAttr);
glDrawArrays(GL_TRIANGLES, 0, vertices.size());
program.disableAttributeArray(normalAttr);
program.disableAttributeArray(vertexAttr);
}
// Some OpenGL implementations have serious issues with compiling and linking
// shaders on multiple threads concurrently. Avoid this.
Q_GLOBAL_STATIC(QMutex, initMutex)
void Renderer::render()
{
if (m_exiting)
return;
QOpenGLContext *ctx = m_glwidget->context();
if (!ctx) // QOpenGLWidget not yet initialized
return;
// Grab the context.
m_grabMutex.lock();
emit contextWanted();
m_grabCond.wait(&m_grabMutex);
QMutexLocker lock(&m_renderMutex);
m_grabMutex.unlock();
if (m_exiting)
return;
Q_ASSERT(ctx->thread() == QThread::currentThread());
// Make the context (and an offscreen surface) current for this thread. The
// QOpenGLWidget's fbo is bound in the context.
m_glwidget->makeCurrent();
if (!m_inited) {
m_inited = true;
initializeOpenGLFunctions();
QMutexLocker initLock(initMutex());
QOpenGLShader *vshader = new QOpenGLShader(QOpenGLShader::Vertex, this);
vshader->compileSourceCode(VERTEX_SHADER);
QOpenGLShader *fshader = new QOpenGLShader(QOpenGLShader::Fragment, this);
fshader->compileSourceCode(FRAGMENT_SHADER);
program.addShader(vshader);
program.addShader(fshader);
program.link();
vertexAttr = program.attributeLocation("vertex");
normalAttr = program.attributeLocation("normal");
matrixUniform = program.uniformLocation("matrix");
m_fAngle = 0;
m_fScale = 1;
createGeometry();
vbo.create();
vbo.bind();
const int verticesSize = vertices.count() * 3 * sizeof(GLfloat);
vbo.allocate(verticesSize * 2);
vbo.write(0, vertices.constData(), verticesSize);
vbo.write(verticesSize, normals.constData(), verticesSize);
m_elapsed.start();
}
//qDebug("%p elapsed %lld", QThread::currentThread(), m_elapsed.restart());
glClearColor(0.1f, 0.2f, 0.2f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glFrontFace(GL_CW);
glCullFace(GL_FRONT);
glEnable(GL_CULL_FACE);
glEnable(GL_DEPTH_TEST);
QMatrix4x4 modelview;
modelview.rotate(m_fAngle, 0.0f, 1.0f, 0.0f);
modelview.rotate(m_fAngle, 1.0f, 0.0f, 0.0f);
modelview.rotate(m_fAngle, 0.0f, 0.0f, 1.0f);
modelview.scale(m_fScale);
modelview.translate(0.0f, -0.2f, 0.0f);
program.bind();
program.setUniformValue(matrixUniform, modelview);
paintQtLogo();
program.release();
glDisable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
m_fAngle += 1.0f;
// Make no context current on this thread and move the QOpenGLWidget's
// context back to the gui thread.
m_glwidget->doneCurrent();
ctx->moveToThread(qGuiApp->thread());
// Schedule composition. Note that this will use QueuedConnection, meaning
// that update() will be invoked on the gui thread.
QMetaObject::invokeMethod(m_glwidget, "update");
}
void Renderer::createGeometry()
{
vertices.clear();
normals.clear();
qreal x1 = +0.06f;
qreal y1 = -0.14f;
qreal x2 = +0.14f;
qreal y2 = -0.06f;
qreal x3 = +0.08f;
qreal y3 = +0.00f;
qreal x4 = +0.30f;
qreal y4 = +0.22f;
quad(x1, y1, x2, y2, y2, x2, y1, x1);
quad(x3, y3, x4, y4, y4, x4, y3, x3);
extrude(x1, y1, x2, y2);
extrude(x2, y2, y2, x2);
extrude(y2, x2, y1, x1);
extrude(y1, x1, x1, y1);
extrude(x3, y3, x4, y4);
extrude(x4, y4, y4, x4);
extrude(y4, x4, y3, x3);
const int NumSectors = 100;
const qreal sectorAngle = 2 * qreal(M_PI) / NumSectors;
for (int i = 0; i < NumSectors; ++i) {
qreal angle = i * sectorAngle;
qreal sinAngle = sin(angle);
qreal cosAngle = cos(angle);
qreal x5 = 0.30 * sinAngle;
qreal y5 = 0.30 * cosAngle;
qreal x6 = 0.20 * sinAngle;
qreal y6 = 0.20 * cosAngle;
angle += sectorAngle;
sinAngle = sin(angle);
cosAngle = cos(angle);
qreal x7 = 0.20 * sinAngle;
qreal y7 = 0.20 * cosAngle;
qreal x8 = 0.30 * sinAngle;
qreal y8 = 0.30 * cosAngle;
quad(x5, y5, x6, y6, x7, y7, x8, y8);
extrude(x6, y6, x7, y7);
extrude(x8, y8, x5, y5);
}
for (qsizetype i = 0; i < vertices.size(); ++i)
vertices[i] *= 2.0f;
}
void Renderer::quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4)
{
vertices << QVector3D(x1, y1, -0.05f);
vertices << QVector3D(x2, y2, -0.05f);
vertices << QVector3D(x4, y4, -0.05f);
vertices << QVector3D(x3, y3, -0.05f);
vertices << QVector3D(x4, y4, -0.05f);
vertices << QVector3D(x2, y2, -0.05f);
QVector3D n = QVector3D::normal
(QVector3D(x2 - x1, y2 - y1, 0.0f), QVector3D(x4 - x1, y4 - y1, 0.0f));
normals << n;
normals << n;
normals << n;
normals << n;
normals << n;
normals << n;
vertices << QVector3D(x4, y4, 0.05f);
vertices << QVector3D(x2, y2, 0.05f);
vertices << QVector3D(x1, y1, 0.05f);
vertices << QVector3D(x2, y2, 0.05f);
vertices << QVector3D(x4, y4, 0.05f);
vertices << QVector3D(x3, y3, 0.05f);
n = QVector3D::normal
(QVector3D(x2 - x4, y2 - y4, 0.0f), QVector3D(x1 - x4, y1 - y4, 0.0f));
normals << n;
normals << n;
normals << n;
normals << n;
normals << n;
normals << n;
}
void Renderer::extrude(qreal x1, qreal y1, qreal x2, qreal y2)
{
vertices << QVector3D(x1, y1, +0.05f);
vertices << QVector3D(x2, y2, +0.05f);
vertices << QVector3D(x1, y1, -0.05f);
vertices << QVector3D(x2, y2, -0.05f);
vertices << QVector3D(x1, y1, -0.05f);
vertices << QVector3D(x2, y2, +0.05f);
QVector3D n = QVector3D::normal
(QVector3D(x2 - x1, y2 - y1, 0.0f), QVector3D(0.0f, 0.0f, -0.1f));
normals << n;
normals << n;
normals << n;
normals << n;
normals << n;
normals << n;
}

108
examples/opengl/threadedqopenglwidget/renderer.h Normal file
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@ -0,0 +1,108 @@
/****************************************************************************
**
** Copyright (C) 2022 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,
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
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****************************************************************************/
#ifndef RENDERER_H
#define RENDERER_H
#include <QOpenGLFunctions>
#include <QOpenGLBuffer>
#include <QOpenGLShaderProgram>
#include <QVector3D>
#include <QMatrix4x4>
#include <QThread>
#include <QMutex>
#include <QWaitCondition>
#include <QElapsedTimer>
QT_FORWARD_DECLARE_CLASS(QOpenGLWidget)
class Renderer : public QObject, protected QOpenGLFunctions
{
Q_OBJECT
public:
explicit Renderer(QOpenGLWidget *w);
void lockRenderer() { m_renderMutex.lock(); }
void unlockRenderer() { m_renderMutex.unlock(); }
QMutex *grabMutex() { return &m_grabMutex; }
QWaitCondition *grabCond() { return &m_grabCond; }
void prepareExit() { m_exiting = true; m_grabCond.wakeAll(); }
signals:
void contextWanted();
public slots:
void render();
private:
void paintQtLogo();
void createGeometry();
void quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4);
void extrude(qreal x1, qreal y1, qreal x2, qreal y2);
bool m_inited = false;
qreal m_fAngle = 0;
qreal m_fScale = 1;
QList<QVector3D> vertices;
QList<QVector3D> normals;
QOpenGLShaderProgram program;
QOpenGLBuffer vbo;
int vertexAttr = 0;
int normalAttr = 0;
int matrixUniform = 0;
QOpenGLWidget *m_glwidget = nullptr;
QMutex m_renderMutex;
QElapsedTimer m_elapsed;
QMutex m_grabMutex;
QWaitCondition m_grabCond;
bool m_exiting = false;
};
#endif // RENDERER_H

6
examples/opengl/threadedqopenglwidget/threadedqopenglwidget.pro
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@ -2,10 +2,12 @@ QT += widgets opengl openglwidgets
SOURCES += main.cpp \
glwidget.cpp \
mainwindow.cpp
mainwindow.cpp \
renderer.cpp
HEADERS += glwidget.h \
mainwindow.h
mainwindow.h \
renderer.h
target.path = $$[QT_INSTALL_EXAMPLES]/opengl/threadedqopenglwidget
INSTALLS += target