如何与GLFW正确共享上下文

我要做的就是做到这一点，这样，如果我替换了窗口，我将使用新窗口渲染，这可能会发生，因为用户会切换屏幕或从FullScreen切换到窗口，或出于许多其他原因。

到目前为止我的代码看起来像这样：

" context.h"

struct window_deleter {
    void operator()(GLFWwindow * window) const;
};
class context {
    std::unique_ptr<GLFWwindow, window_deleter> window;
public:
    context(int width, int height, const char * s, GLFWmonitor * monitor, GLFWwindow * old_window, bool borderless);
    GLFWwindow * get_window() const;
    void make_current() const;
};

" context.cpp"

context::context(int width, int height, const char * s, GLFWmonitor * monitor, GLFWwindow * old_window, bool borderless) {
    if (!glfwInit()) throw std::runtime_error("Unable to Initialize GLFW");
    if (borderless) glfwWindowHint(GLFW_DECORATED, 0);
    else glfwWindowHint(GLFW_DECORATED, 1);
    window.reset(glfwCreateWindow(width, height, s, monitor, old_window));
    if (!window) throw std::runtime_error("Unable to Create Window");
    make_current();
}
GLFWwindow * context::get_window() const {
    return window.get();
}
void context::make_current() const {
    glfwMakeContextCurrent(window.get());
}

" windowmanager.h"

#include "Context.h"
class window_style;
/* window_style is basically a really fancy "enum class", and I don't 
 * believe its implementation or interface are relevant to this project.
 * I'll add it if knowing how it works is super critical.
 */
class window_manager {
    context c_context;
    uint32_t c_width, c_height;
    std::string c_title;
    window_style c_style;
    std::function<bool()> close_test;
    std::function<void()> poll_task;
public:
    static GLFWmonitor * get_monitor(window_style style);
    window_manager(uint32_t width, uint32_t height, std::string const& title, window_style style);
    context & get_context();
    const context & get_context() const;
    bool resize(uint32_t width, uint32_t height, std::string const& title, window_style style);
    std::function<bool()> get_default_close_test();
    void set_close_test(std::function<bool()> const& test);
    std::function<void()> get_default_poll_task();
    void set_poll_task(std::function<void()> const& task);
    void poll_loop();
};

" windowmanager.cpp"

GLFWmonitor * window_manager::get_monitor(window_style style) {
    if (style.type != window_style::style_type::fullscreen) return nullptr;
    if (!glfwInit()) throw std::runtime_error("Unable to initialize GLFW");
    int count;
    GLFWmonitor ** monitors = glfwGetMonitors(&count);
    if (style.monitor_number >= uint32_t(count)) throw invalid_monitor_exception{};
    return monitors[style.monitor_number];
}
std::function<bool()> window_manager::get_default_close_test() {
    return [&] {return glfwWindowShouldClose(c_context.get_window()) != 0; };
}
window_manager::window_manager(uint32_t width, uint32_t height, std::string const& title, window_style style) :
c_context(int(width), int(height), title.c_str(), get_monitor(style), nullptr, style.type == window_style::style_type::borderless),
    c_width(width), c_height(height), c_title(title), c_style(style), close_test(get_default_close_test()), poll_task(get_default_poll_task()) {
}
context & window_manager::get_context() {
    return c_context;
}
const context & window_manager::get_context() const {
    return c_context;
}
bool window_manager::resize(uint32_t width, uint32_t height, std::string const& title, window_style style) {
    if (width == c_width && height == c_height && title == c_title && style == c_style) return false;
    c_width = width;
    c_height = height;
    c_title = title;
    c_style = style;
    c_context = context(int(width), int(height), title.c_str(), get_monitor(style), get_context().get_window(), style.type == window_style::style_type::borderless);
    return true;
}
void window_manager::set_close_test(std::function<bool()> const& test) {
    close_test = test;
}
std::function<void()> window_manager::get_default_poll_task() {
    return [&] {glfwSwapBuffers(c_context.get_window()); };
}
void window_manager::set_poll_task(std::function<void()> const& task) {
    poll_task = task;
}
void window_manager::poll_loop() {
    while (!close_test()) {
        glfwPollEvents();
        poll_task();
    }
}

" main.cpp"

int main() {
    try {
        glfwInit();
        const GLFWvidmode * vid_mode = glfwGetVideoMode(glfwGetPrimaryMonitor());
        gl_backend::window_manager window(vid_mode->width, vid_mode->height, "First test of the window manager", gl_backend::window_style::fullscreen(0));
        glfwSetKeyCallback(window.get_context().get_window(), [](GLFWwindow * window, int, int, int, int) {glfwSetWindowShouldClose(window, 1); });
        glbinding::Binding::initialize();
        //Anything with a "glresource" prefix is basically just a std::shared_ptr<GLuint> 
        //with some extra deletion code added.
        glresource::vertex_array vao;
        glresource::buffer square;
        float data[] = {
            -.5f, -.5f,
            .5f, -.5f,
            .5f, .5f,
            -.5f, .5f
        };
        gl::glBindVertexArray(*vao);
        gl::glBindBuffer(gl::GL_ARRAY_BUFFER, *square);
        gl::glBufferData(gl::GL_ARRAY_BUFFER, sizeof(data), data, gl::GL_STATIC_DRAW);
        gl::glEnableVertexAttribArray(0);
        gl::glVertexAttribPointer(0, 2, gl::GL_FLOAT, false, 2 * sizeof(float), nullptr);
        std::string vert_src =
            "#version 430n"
            "layout(location = 0) in vec2 vertices;"
            "void main() {"
            "gl_Position = vec4(vertices, 0, 1);"
            "}";
        std::string frag_src =
            "#version 430n"
            "uniform vec4 square_color;"
            "out vec4 fragment_color;"
            "void main() {"
            "fragment_color = square_color;"
            "}";
        glresource::shader vert(gl::GL_VERTEX_SHADER, vert_src);
        glresource::shader frag(gl::GL_FRAGMENT_SHADER, frag_src);
        glresource::program program({ vert, frag });
        window.set_poll_task([&] {
            gl::glUseProgram(*program);
            gl::glBindVertexArray(*vao);
            glm::vec4 color{ (glm::sin(float(glfwGetTime())) + 1) / 2, 0.f, 0.5f, 1.f };
            gl::glUniform4fv(gl::glGetUniformLocation(*program, "square_color"), 1, glm::value_ptr(color));
            gl::glDrawArrays(gl::GL_QUADS, 0, 4);
            glfwSwapBuffers(window.get_context().get_window());
        });
        window.poll_loop();
        window.resize(vid_mode->width, vid_mode->height, "Second test of the window manager", gl_backend::window_style::fullscreen(1));
        glfwSetKeyCallback(window.get_context().get_window(), [](GLFWwindow * window, int, int, int, int) {glfwSetWindowShouldClose(window, 1); });
        window.poll_loop();
    }
    catch (std::exception const& e) {
        std::cerr << e.what() << std::endl;
        std::ofstream error_log("error.log");
        error_log << e.what() << std::endl;
        system("pause");
    }
    return 0;
}

因此，代码的当前版本是应该执行以下：

1. 在主监视器上显示全屏幕窗口
2. 在此显示器上，显示一个"正方形"（矩形，实际上....），随着时间的流逝，洋红色和蓝色之间的过渡，而背景过渡是洋红色和绿色的。
3. 当用户按键时，使用第一个窗口的上下文在第二个监视器上创建一个新的全屏窗口，以馈入GLFW的窗口创建，并销毁原始窗口（按照此顺序）
4. 在第二个窗口上显示相同的矩形
5. 继续定期过渡背景
6. 当用户再次按下键时，破坏了第二个窗口并退出程序。

在这些步骤中，步骤4根本不起作用，步骤3部分可行：窗口确实会创建，但默认情况下没有显示，并且用户必须通过任务栏调用它。所有其他步骤都按预期工作，包括两个窗口上的过渡背景。

因此，我的假设是，在上下文之间的对象共享方面出现了问题。具体来说，我创建的第二个上下文似乎并没有接收第一个上下文创建的对象。我有明显的逻辑错误吗？我应该做其他事情以确保上下文共享按预期工作？GLFW中可能只有一个错误？