一般而言，纹理坐标范围(0,0)到(1,1)，若设置超出该范围，则会按照如下环绕方式处理。


设置纹理参数的函数原型为：

坐标信息：
float vertices[] = {
// positions // colors // texture coords
0.9f, 0.9f, 0.0f, 1.0f, 0.0f, 0.0f, 3.0f, 3.0f, // top right
0.9f, -0.9f, 0.0f, 0.0f, 1.0f, 0.0f, 3.0f, -1.0f, // bottom right
-0.9f, -0.9f, 0.0f, 0.0f, 0.0f, 1.0f, -1.0f, -1.0f, // bottom left
-0.9f, 0.9f, 0.0f, 1.0f, 1.0f, 0.0f, -1.0f, 3.0f // top left
};
unsigned int indices[] = { // note that we start from 0!
0, 1, 3, // first triangle
1, 2, 3 // second triangle
};
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_STATIC_DRAW);
    textureSmile = new QOpenGLTexture(QImage("images/awesomeface.png").mirrored());
    shaderProgram.bind();
    shaderProgram.setUniformValue("textureSmile", 0);
    glBindVertexArray(0);
    textureSmile->bind(0);
    /*glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);*/
    float borderColor[] = { 1.0f, 1.0f, 0.0f, 1.0f };
    glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);

paintGL()函数：

	glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);
    shaderProgram.bind();
    glBindVertexArray(VAO);
    textureSmile->bind(0);
    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, NULL);

运行效果1（镜像重复）：

运行效果2（指定边界）