Qt中OpenGL窗口创建的几种形式

Qt中OpenGL窗口创建的几种形式

一、使用penGLWidget：

创建一个带widget类的项目：

widget.h为：

#ifndef WIDGET_H#define WIDGET_H#include #include #include class Widget : public QOpenGLWidget, protected QOpenGLFunctions{ Q_OBJECTpublic: Widget(QWidget *parent = 0); ~Widget(); void initializeGL(); void resizeGL(int w, int h); void paintGL();};#endif // WIDGET_H

widget.cpp:

#include "widget.h"Widget::Widget(QWidget *parent) : QOpenGLWidget(parent){}Widget::~Widget(){}void Widget::initializeGL(){ initializeOpenGLFunctions();}void Widget::resizeGL(int w, int h){ glViewport(0, 0, w, h);}void Widget::paintGL(){ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glClearColor(0.0f, 0.0f, 0.0f, 1.0f);}

main.cpp:

#include "widget.h"#include int main(int argc, char *argv[]){ QApplication a(argc, argv); Widget w; w.show(); return a.exec();}

二、使用QGLWidget创建

需要在pro文件里+=opengl

并包含GL/glut.h 没用的话需要自己把glut.h放到Qt的include的GL文件夹下：

widget.h:

#ifndef WIDGET_H#define WIDGET_H#include #include #include class Widget : public QGLWidget{ Q_OBJECTpublic: Widget(QWidget *parent = 0); ~Widget();protected: void initializeGL(); void resizeGL(int w,int h); void paintGL();};#endif // WIDGET_H

widget.cpp：

#include "widget.h"Widget::Widget(QWidget *parent) : QGLWidget(parent){}Widget::~Widget(){}void Widget::initializeGL(){ glClearColor(0.0,0.0,0.0,1.0); glEnable(GL_DEPTH_TEST); glEnable(GL_TEXTURE_2D);}void Widget::resizeGL(int w,int h){ glViewport(0,0,(GLsizei)w,(GLsizei)h);}void Widget::paintGL(){ glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);}

main.cpp:

#include "widget.h"#include int main(int argc, char *argv[]){ QApplication a(argc, argv); Widget w; w.show(); return a.exec();}

三、在有就是自己创建一个

OpenGLWindow类继承自 QWindow然后创建子类并覆盖初始化函数和渲染函数：

openglwindow.h:

#include #include QT_BEGIN_NAMESPACEclass QPainter;class QOpenGLContext;class QOpenGLPaintDevice;QT_END_NAMESPACEclass OpenGLWindow : public QWindow, protected QOpenGLFunctions{ Q_OBJECTpublic: explicit OpenGLWindow(QWindow *parent = 0); ~OpenGLWindow(); virtual void render(QPainter *painter); virtual void render(); virtual void initialize(); void setAnimating(bool animating);public slots: void renderLater(); void renderNow();protected: bool event(QEvent *event) override; void exposeEvent(QExposeEvent *event) override;private: bool m_animating; QOpenGLContext *m_context; QOpenGLPaintDevice *m_device;};

openglwindow.cpp:

#include "openglwindow.h"#include #include #include #include #include OpenGLWindow::OpenGLWindow(QWindow *parent) : QWindow(parent) , m_animating(false) , m_context(0) , m_device(0){ setSurfaceType(QWindow::OpenGLSurface);}OpenGLWindow::~OpenGLWindow(){ delete m_device;}void OpenGLWindow::render(QPainter *painter)//这个函数会在三角形类中重载{ Q_UNUSED(painter);//Q_UNUSED避免警告}void OpenGLWindow::initialize()//这个函数会在三角形类中重载{}void OpenGLWindow::render(){}void OpenGLWindow::renderLater(){ qDebug()<<"renderLater"; requestUpdate();}bool OpenGLWindow::event(QEvent *event){ qDebug()<<"event"; switch (event->type()) { case QEvent::UpdateRequest: renderNow(); return true; default: return QWindow::event(event); }}void OpenGLWindow::exposeEvent(QExposeEvent *event){ qDebug()<<"exposeEvent"; Q_UNUSED(event); qDebug()<<"stop1"; if (isExposed())//是否显示，也就是最小化时 renderNow(); else { qDebug()<<"stop2"; }}void OpenGLWindow::renderNow(){ qDebug()<<"renderNow"; if (!isExposed()){ return; qDebug()<<"no exposed"; } bool needsInitialize = false; if (!m_context) { m_context = new QOpenGLContext(this); m_context->setFormat(requestedFormat()); m_context->create(); needsInitialize = true; } m_context->makeCurrent(this); if (needsInitialize) { initializeOpenGLFunctions(); initialize(); } render(); m_context->swapBuffers(this); if (m_animating) renderLater();}void OpenGLWindow::setAnimating(bool animating){ qDebug()<<"setAnimating"; m_animating = animating; if (animating) renderLater();}

main.cpp:

#include "openglwindow.h"#include #include #include #include #include class TriangleWindow : public OpenGLWindow{public: TriangleWindow(); void initialize() override; void render() override;//重载这两个函数private: GLuint m_posAttr; GLuint m_colAttr; GLuint m_matrixUniform; QOpenGLShaderProgram *m_program; int m_frame;};TriangleWindow::TriangleWindow() : m_program(0) , m_frame(0){}int main(int argc, char **argv){ QGuiApplication app(argc, argv); TriangleWindow window; window.resize(640, 480); window.show(); window.setAnimating(true); return app.exec();}void TriangleWindow::initialize(){ qDebug()<<"initialize";}void TriangleWindow::render(){ qDebug()<<"render";}

四、继承自QOpenGLWindow的窗口，跑不出来。

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