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50
51#ifndef GLWIDGET_H
52#define GLWIDGET_H
53
54#include <QOpenGLWidget>
55#include <QOpenGLFunctions>
56#include <QOpenGLShaderProgram>
57#include <QOpenGLBuffer>
58#include <QVector3D>
59#include <QMatrix4x4>
60#include <QThread>
61#include <QMutex>
62#include <QWaitCondition>
63#include <QElapsedTimer>
64
65class GLWidget;
66
67class Renderer : public QObject, protected QOpenGLFunctions
68{
69 Q_OBJECT
70
71public:
72 Renderer(GLWidget *w);
73 void lockRenderer() { m_renderMutex.lock(); }
74 void unlockRenderer() { m_renderMutex.unlock(); }
75 QMutex *grabMutex() { return &m_grabMutex; }
76 QWaitCondition *grabCond() { return &m_grabCond; }
77 void prepareExit() { m_exiting = true; m_grabCond.wakeAll(); }
78
79signals:
80 void contextWanted();
81
82public slots:
83 void render();
84
85private:
86 void paintQtLogo();
87 void createGeometry();
88 void quad(qreal x1, qreal y1, qreal x2, qreal y2, qreal x3, qreal y3, qreal x4, qreal y4);
89 void extrude(qreal x1, qreal y1, qreal x2, qreal y2);
90
91 bool m_inited = false;
92 qreal m_fAngle = 0;
93 qreal m_fScale = 1;
94 QVector<QVector3D> vertices;
95 QVector<QVector3D> normals;
96 QOpenGLShaderProgram program;
97 QOpenGLBuffer vbo;
98 int vertexAttr = 0;
99 int normalAttr = 0;
100 int matrixUniform = 0;
101 GLWidget *m_glwidget = nullptr;
102 QMutex m_renderMutex;
103 QElapsedTimer m_elapsed;
104 QMutex m_grabMutex;
105 QWaitCondition m_grabCond;
106 bool m_exiting = false;
107};
108
109class GLWidget : public QOpenGLWidget
110{
111 Q_OBJECT
112public:
113 explicit GLWidget(QWidget *parent = nullptr);
114 ~GLWidget();
115
116protected:
117 void paintEvent(QPaintEvent *) override { }
118
119signals:
120 void renderRequested();
121
122public slots:
123 void grabContext();
124
125private slots:
126 void onAboutToCompose();
127 void onFrameSwapped();
128 void onAboutToResize();
129 void onResized();
130
131private:
132 QThread *m_thread;
133 Renderer *m_renderer;
134};
135
136#endif
137

source code of qtbase/examples/opengl/threadedqopenglwidget/glwidget.h