/// in glwidget.h

......
    QGLShaderProgram *program1;
    QGLShaderProgram *program2;
.....

/// glwidget.cpp
.....
void GLWidget::initializeGL()
{
    program1 = new QGLShaderProgram(this);
    program2 = new QGLShaderProgram(this);
    glClearColor(0.1f, 0.1f, 0.2f, 1.0f);

    glGenTextures(1, &m_uiTexture);
    m_uiTexture = bindTexture(QImage(":/qt.png"));

    QGLShader *vshader1 = new QGLShader(QGLShader::Vertex, this);
.....