绑定OpenGL上下文时使用假GLFW _ VISIBILE提示的目的

Question

我目前正在遵循一个教程，其中有创建窗口的初始化代码

private void init() {
    // Setup an error callback. The default implementation
    // will print the error message in System.err.
    errorCallback = GLFWErrorCallback.createPrint(System.err);
    glfwSetErrorCallback(errorCallback);

    // Initialize GLFW. Most GLFW functions will not work before doing this.
    if (!glfwInit()) {
        throw new IllegalStateException("Unable to initialize GLFW");
    }

    // Configure our window
    glfwDefaultWindowHints(); // optional, the current window hints are already the default
    glfwWindowHint(GLFW_VISIBLE, GL_FALSE); // the window will stay hidden after creation
    glfwWindowHint(GLFW_RESIZABLE, GL_TRUE); // the window will be resizable

    int WIDTH = 300;
    int HEIGHT = 300;

    // Create the window
    window = glfwCreateWindow(WIDTH, HEIGHT, "Hello World!", NULL, NULL);
    if (window == NULL) {
        throw new RuntimeException("Failed to create the GLFW window");
    }

    // Setup a key callback. It will be called every time a key is pressed, repeated or released.
    glfwSetKeyCallback(window, keyCallback = new GLFWKeyCallback() {
        @Override
        public void invoke(long window, int key, int scancode, int action, int mods) {
            if (key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE) {
                glfwSetWindowShouldClose(window, true); // We will detect this in our rendering loop
            }
        }
    });

    // Get the resolution of the primary monitor
    GLFWVidMode vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());
    // Center our window
    glfwSetWindowPos(
            window,
            (vidmode.width() - WIDTH) / 2,
            (vidmode.height() - HEIGHT) / 2
    );

    // Make the OpenGL context current
    glfwMakeContextCurrent(window);
    // Enable v-sync
    glfwSwapInterval(1);

    // Make the window visible
    glfwShowWindow(window);
}

注意< code > glfwWindowHint(GLFW _ VISIBLE，GL _ FALSE)；提示被禁用，那么在创建窗口、设置按键回调、绑定opengl上下文之后，它又被启用< code > glfwShowWindow(window)；

留档不建议这样做，删除两行似乎不会改变任何事情。为什么首先禁用提示？

教程：https://lwjglgamedev.gitbooks.io/3d-game-development-with-lwjgl/content/chapter1/chapter1.html

Answer 1

它禁用了Visability，因此它可以设置大小、更改位置和初始化上下文，而无需客户端见证。从GLFW文档中的窗口可视性部分：

窗口模式窗口最初可以使用GLFW_VISIBLE窗口提示创建隐藏。创建隐藏的窗口在显示之前对用户完全不可见。如果您需要在显示窗口之前进一步设置窗口，例如将其移动到特定位置，这可能会很有用。

你的程序遵循这个确切的例子

glfwSetWindowPos(
            window,
            (vidmode.width() - WIDTH) / 2,
            (vidmode.height() - HEIGHT) / 2
    );