Qt 与C++ 混合编程之OpenGL篇(1)

[yuping511313]

之前也是各个地方找,习惯用百度,主要大多是中文的 .找出来的呢大多是我不需要的. 最后是用.....那个大哥了,


1.main.qml
[code=Text]
import QtQuick 2.4
import QtQuick.Controls 1.3
import QtQuick.Window 2.2
import QtQuick.Dialogs 1.2
import QMLQFBO 1.0

Window {
title: qsTr("Hello World")
width: 640
height: 480
visible: true

Rectangle{
anchors.fill: parent;
color:"#33333350"
QMLQFBO{
id:models;
anchors.fill: parent;
}
}

Text {
id: time ;
text: qsTr(models.fnGetTestStr());
font.family: "微软雅黑"
font.pixelSize: 16;
}
Timer{
interval: 1000;
running: true;
repeat: true;
onTriggered: time.text=Date().toString();
}
}

[/code]


2. main.cpp

#include <QApplication>
#include <QQmlApplicationEngine>
#include "qFramebuffer.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    qmlRegisterType<CQFramebuffer>("QMLQFBO", 1, 0, "QMLQFBO");
    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    return app.exec();
}

3.qFramebuffer.h

#include <QQuickFramebufferObject>
#include "qFramebufferRender.h"

#include <QVector3D>

class CQFramebuffer:public QQuickFramebufferObject
{
    Q_OBJECT
public:
    CQFramebuffer();
    ~CQFramebuffer();

    // QQuickFramebufferObject interface
public:
    Renderer *createRenderer() const;

public:
    Q_INVOKABLE QString fnGetTestStr();

};

qFramebuffer.cpp

#include "qFramebuffer.h"

CQFramebuffer::CQFramebuffer()
{

}

CQFramebuffer::~CQFramebuffer()
{

}
/**
 * @brief QFBO::createRenderer
 * @return
 */
QQuickFramebufferObject::Renderer *CQFramebuffer::createRenderer()const
{
    CQFramebufferRender *cQFBOr = new CQFramebufferRender();
    return cQFBOr;
}

QString CQFramebuffer::fnGetTestStr()
{
    return "成功返回";
}

3.qFramebufferRender.h

#pragma once
#include <QQuickFramebufferObject>
#include <QOpenGLFramebufferObject>
#include <QOpenGLFunctions>
#include <freeglut.h>  
#include "qFramebuffer.h"
#include <QVector3D>
#pragma comment(lib,"freeglut.lib")

/**
 * @brief The CQFramebufferRenderclass QQuickFramebufferObject::Renderer
 * @author yuping
 * @param
 * @date
 */
class CQFramebufferRender:public QQuickFramebufferObject::Renderer
{
public:
    CQFramebufferRender();
    ~CQFramebufferRender();

    // Renderer interface
public:
    void render();
    QOpenGLFramebufferObject *createFramebufferObject(const QSize &size);
    void synchronize(QQuickFramebufferObject *);

public:
    float m_Scale/*保存当前缩放量*/,
            m_ScaleFactor/*缩放因子*/,
            m_ScaleMax, m_ScaleMin,
            m_Angle/*保存当前的旋转角度*/,
            m_AngleFactor,
            m_AngleY,  m_AngleX;
public:
    void fnDisplay();
private:
    void fnInitGL();
};

.qFramebufferRender.cpp

#include "qFramebufferRender.h"


CQFramebufferRender::CQFramebufferRender()
{
    this->m_Angle = 1.0f;
    this->m_Scale = 1.0f;

    this->m_AngleFactor = 0.1f;
    this->m_AngleX =
            this->m_AngleY = 1.0f;
    this->m_ScaleFactor = 0.5f;
    this->m_ScaleMax = 4.0f;
    this->m_ScaleMin = 0.5f;

    this->fnInitGL();

}

CQFramebufferRender::~CQFramebufferRender()
{

}
QOpenGLFramebufferObject *CQFramebufferRender::createFramebufferObject(const QSize &size)
{  // create opengl FBO
    QOpenGLFramebufferObjectFormat format;
    format.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);
    format.setSamples(4);
    QOpenGLFramebufferObject *qoglfbo = new QOpenGLFramebufferObject(size, format);
    this->fnInitGL();
    return qoglfbo;
}
//开始每帧的渲染工作 
void CQFramebufferRender::render()
{
    QOpenGLFunctions glFuncs(QOpenGLContext::currentContext());
    glFuncs.glUseProgram(0);
    this->fnDisplay();
    update();
}
/**
 * @brief CQFBOr::synchronize 窗口大小改变时
 * @param item
 */
void CQFramebufferRender::synchronize(QQuickFramebufferObject *item)
{
    CQFramebuffer *fbitem = static_cast<CQFramebuffer *>(item);
}
void CQFramebufferRender::fnDisplay()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

#pragma region 二,与调整模型的位置来实现 平移,旋转,缩放
    glRotatef(m_AngleX,1.0f,0,0);//绕X轴
    //glRotatef(m_AngleY,0.0f,1.0f,0.0f);//绕Y轴
    //glRotatef(angle,0.0f,0.0f,1.0f);//绕Z轴
    // glScalef(m_Scale,m_Scale,m_Scale);//缩放
#pragma endregion

    glPushMatrix();
    glTranslatef(0,0,0);
    glLineWidth(5.5f);
    glBegin(GL_LINES);
    glColor3f(0.5f,0.0f,0.0f);
    glVertex2f(-0.5f,0);
    glVertex2f(0.5f,0);
    glColor3f(0.0f,0.5f,1.0f);
    glVertex3f(0,-0.5f,0.2f);
    glVertex3f(0,1.5f,0.2f);
    glEnd();
    glPopMatrix();

}
//只初始化一次
void CQFramebufferRender::fnInitGL()
{

    glutInitDisplayMode(GLUT_RGBA | GLUT_SINGLE);
    glShadeModel(GL_SMOOTH);//着色模式平滑
    glClearColor(0.2f, 0.2f, 0.2f, 0.5f);//设置背景颜色
    glClearDepth(1.0f); //设置深度缓存的清除值
    glEnable(GL_DEPTH_TEST);  //开启深度检测
    glDepthFunc(GL_LEQUAL);  //油墨深度缓存的函数,然后,靠近的就绘制在上面
    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);//视图修正   打开最高质量渲染
    //glEnable(GL_LIGHT0);//打开1号光源
    glMatrixMode(GL_PROJECTION);//设置当前矩阵为透视矩阵
    glLoadIdentity();//加载一个单位矩阵
    gluPerspective(60.0f,1, 1,5000);//设置透视参数
    glMatrixMode(GL_MODELVIEW);//    -----模型视图矩阵
    glLoadIdentity();

    glClearColor(1.0f,0.6f,0.1f,0.5f);
    gluLookAt(0.0f,0.0f,20.0f, //eye    x,y,z
              0, 0, 0,     //center   x,y,z
              0.0f, 1.0f, 0.0f);//up  x,y,z
}

大功告成!

最后你看见是两条线 一条不动一条以x轴旋转 ..以后的主慢慢来咯

最,最,最,简单的入门了.......