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find_package(Qt5 COMPONENTS
  Core
  Gui
  Widgets
        OpenGL
  REQUIRED)

target_link_libraries(untitled2 PRIVATE
        Qt5::Core
        Qt5::Gui
        Qt5::Widgets
        Qt5::OpenGL
)

if(WIN32)
    target_link_libraries(untitled2 PRIVATE opengl32.lib)
endif()

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#include <QOpenGLWidget>
class qopenglwiget : public QOpenGLWidget {
Q_OBJECT

public:
	...
    virtual void initializeGL() override;
    virtual void paintGL() override;
    virtual void resizeGL(int w, int h) override;

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void qopenglwiget::initializeGL() {
    initializeOpenGLFunctions();
}
void qopenglwiget::resizeGL(int w,int h) {
    glViewport(0,0,w,h);//startPoint->endPoint没有高dpi兼容性
}
void qopenglwiget::paintGL() {
    glBegin(GL_TRIANGLES);//设置绘制方法
    glVertex3f(-1.0f,-1.0f,0.0f);//x,y,z.(0,0,0)为三维空间的
    glVertex3f(1.0f,-1.0f,0.0f);
    glVertex3f(0.0f,1.0f,0.0f);
    glEnd();
}