qt qml中的opengl,无法更新屏幕上的图像

为了在qml中使用opengl,我创建了 OpenGlVideoQtQuick 和 OpenGlVideoQtQuickRenderer 类完全如所述 here . 唯一的区别是我把 updateData() 函数来更新缓冲区,而在示例中,屏幕中会绘制静态图像。

以下是 openglvideoqtquickrenderer ,这是 paint 功能

void OpenGlVideoQtQuickRenderer::paint()
{
    if (this->firstRun) {
        this->firstRun = false;
        //qDebug() << "initializeGL";
        std::cout << "initializing gl" << std::endl;
        //初始化opengl （QOpenGLFunctions继承）函数
        initializeOpenGLFunctions();

        datas[0] = new unsigned char[width*height];     //Y
        datas[1] = new unsigned char[width*height/4];   //U
        datas[2] = new unsigned char[width*height/4];   //V   

        //this->m_F  = QOpenGLContext::currentContext()->functions();

        //program加载shader（顶点和片元）脚本
        //片元（像素）
        std::cout << program.addShaderFromSourceCode(QOpenGLShader::Fragment, tString2) << std::endl;
        //顶点shader
        std::cout << program.addShaderFromSourceCode(QOpenGLShader::Vertex, vString2) << std::endl;

        //设置顶点坐标的变量
        program.bindAttributeLocation("vertexIn",A_VER);

        //设置材质坐标
        program.bindAttributeLocation("textureIn",T_VER);

        //编译shader
        std::cout << "program.link() = " << program.link() << std::endl;

    }
    program.bind();

    //传递顶点和材质坐标
    //顶点
    static const GLfloat ver[] = {
        -1.0f,-1.0f,
        1.0f,-1.0f,
        -1.0f, 1.0f,
        1.0f,1.0f
    };

    //材质
    static const GLfloat tex[] = {
        0.0f, 1.0f,
        1.0f, 1.0f,
        0.0f, 0.0f,
        1.0f, 0.0f
    };

    //顶点
    glVertexAttribPointer(A_VER, 2, GL_FLOAT, 0, 0, ver);
    glEnableVertexAttribArray(A_VER);

    //材质
    glVertexAttribPointer(T_VER, 2, GL_FLOAT, 0, 0, tex);
    glEnableVertexAttribArray(T_VER);

    //glUseProgram(&program);
    //从shader获取材质
    unis[0] = program.uniformLocation("tex_y");
    unis[1] = program.uniformLocation("tex_u");
    unis[2] = program.uniformLocation("tex_v");

    //创建材质
    glGenTextures(3, texs);

    //Y
    glBindTexture(GL_TEXTURE_2D, texs[0]);
    //放大过滤，线性插值   GL_NEAREST(效率高，但马赛克严重)
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    //创建材质显卡空间
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, 0);

    //U
    glBindTexture(GL_TEXTURE_2D, texs[1]);
    //放大过滤，线性插值
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    //创建材质显卡空间
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width/2, height / 2, 0, GL_RED, GL_UNSIGNED_BYTE, 0);

    //V
    glBindTexture(GL_TEXTURE_2D, texs[2]);
    //放大过滤，线性插值
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    //创建材质显卡空间
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width / 2, height / 2, 0, GL_RED, GL_UNSIGNED_BYTE, 0);

    ///分配材质内存空间


    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, texs[0]); //0层绑定到Y材质
    //修改材质内容(复制内存内容)
    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RED, GL_UNSIGNED_BYTE, datas[0]);
    //与shader uni遍历关联
    glUniform1i(unis[0], 0);


    glActiveTexture(GL_TEXTURE0+1);
    glBindTexture(GL_TEXTURE_2D, texs[1]); //1层绑定到U材质
                                           //修改材质内容(复制内存内容)
    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width/2, height / 2, GL_RED, GL_UNSIGNED_BYTE, datas[1]);
    //与shader uni遍历关联
    glUniform1i(unis[1],1);


    glActiveTexture(GL_TEXTURE0+2);
    glBindTexture(GL_TEXTURE_2D, texs[2]); //2层绑定到V材质
                                           //修改材质内容(复制内存内容)
    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width / 2, height / 2, GL_RED, GL_UNSIGNED_BYTE, datas[2]);
    //与shader uni遍历关联
    glUniform1i(unis[2], 2);

    glDrawArrays(GL_TRIANGLE_STRIP,0,4);
    //this->update();

    // Not strictly needed for this example, but generally useful for when
    // mixing with raw OpenGL.
    m_window->resetOpenGLState();//COMMENT OR NOT?
}

这是我用来更新要绘制的缓冲区的函数:

void OpenGlVideoQtQuickRenderer::updateData(unsigned char**data)
{
    std::cout << "updating data..." << std::endl;
    memcpy(datas[0], data[0], width*height);
    memcpy(datas[1], data[1], width*height/4);
    memcpy(datas[2], data[2], width*height/4);
    //I should update something here

}

我唯一的问题是看到updatedata函数被新数据调用,所以缓冲区被更新。但是,屏幕将继续处于初始位置(绿色)。我相信一定有一个函数我必须调用更新一切。

还有什么我需要打电话进来的吗 updateData ?

我试过各种方法来更新数据,但图像仍然不会更新

            this->openGlVideoQtQuickRenderer->paint();
            if (this->openGlVideoQtQuick->window()) {
                std::cout << "window update" << std::endl;
                this->openGlVideoQtQuick->update();
                this->openGlVideoQtQuick->window()->update();
            }

但是,如果我调整屏幕大小,我可以看到图像不到一秒钟,它就会消失。

如果有人想看一看,整个代码是: https://github.com/lucaszanella/orwell/blob/2aff3b97abd88e6ec2980856718e1c8302d41616/OpenGlVideoQtQuick.cpp#L117