QOpenGLWidget绘制实时图像

initializeGL()函数：

	initializeOpenGLFunctions();
    //创建VBO和VAO对象，并赋予ID
    glGenVertexArrays(1, &VAO);
    glGenBuffers(1, &VBO);
    //绑定VBO和VAO对象
    glBindVertexArray(VAO);
    glBindBuffer(GL_ARRAY_BUFFER, VBO);
    //为当前绑定到target的缓冲区对象创建一个新的数据存储。
    //如果data不是NULL，则使用来自此指针的数据初始化数据存储
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
    //告知显卡如何解析缓冲里的属性值
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
    //开启VAO管理的第一个属性值
    glEnableVertexAttribArray(0);
    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
    glEnableVertexAttribArray(1);
    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
    glEnableVertexAttribArray(2);
    glBindBuffer(GL_ARRAY_BUFFER, 0);
    bool success;
    shaderProgram.addShaderFromSourceFile(QOpenGLShader::Vertex, "shaders/shapes.vert");
    shaderProgram.addShaderFromSourceFile(QOpenGLShader::Fragment, "shaders/shapes.frag");
    success = shaderProgram.link();
    if (!success)
        qDebug() << "ERR:" << shaderProgram.log();
    glGenBuffers(1, &EBO);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_DYNAMIC_DRAW);
    textureWall = new QOpenGLTexture(QOpenGLTexture::Target2D);
    textureWall->create();
    textureWall->setFormat(QOpenGLTexture::DepthFormat);//设置纹理像素格式
    textureWall->setSize(1404, 1092);//设置纹理宽、高
    textureWall->allocateStorage();
    shaderProgram.bind();
    shaderProgram.setUniformValue("textureWall", 0);
    glBindVertexArray(0);

paintGL()函数：

glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
shaderProgram.bind();
glBindVertexArray(VAO);
textureWall->bind();
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, NULL);
textureWall->release();
textureWall->destroy();
textureWall->create();

on_timeout槽函数：

int data = qrand() % 4 + 1;
    QString basePath = "images/";
    QString path = basePath + QString::number(data).append(".tiff");
    QByteArray cdata = path.toLocal8Bit();
    cv::Mat imgm = imread(std::string(cdata), cv::IMREAD_UNCHANGED);
    for (int i = 0; i < imgm.rows; i++) {
        for (int j = 0; j < imgm.cols; j++) {
            m_img8bit[i * imgm.cols + j] = imgm.at<uchar>(i, j);
        }
    }
    QImage images(m_img8bit, 1404, 1092, QImage::Format_Grayscale8);
    //QImage resimg = images.convertToFormat(QImage::Format_RGB888);
    textureWall->setData(images);
    update();

顶点坐标：

float vertices[] = {
    // positions      // colors        // texture coords
    1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top right
    1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom right
    -1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom left
    -1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f // top left
};
unsigned int indices[] = { // note that we start from 0!
     0, 1, 3, // first triangle
     1, 2, 3 // second triangle
};