如何使用GLFW在当前监视器上创建全屏窗口

Question

使用glfwCreateWindow使用GLFW3创建窗口:

GLFWwindow* glfwCreateWindow ( int width,
                               int height,
                               const char *title,
                               GLFWmonitor *monitor,
                               GLFWwindow *share 
                             ) 

如果monitor参数不是NULL,则在给定监视器上以全屏模式创建窗口.可以通过调用glfwGetPrimaryMonitor接收主监视器,或者选择glfwGetMonitors的结果之一.但是如何在当前监视器上创建一个全屏窗口,即窗口当前以窗口模式运行的监视器？似乎无法接收当前使用的监视器.有glfwGetWindowMonitor,但它只NULL在窗口模式下以全屏模式返回监视器.

Answer 1

您可以使用glfwGetWindowPos/glfwGetWindowSize找到当前的监视器.此函数返回包含更大窗口区域的监视器.

static int mini(int x, int y)
{
    return x < y ? x : y;
}

static int maxi(int x, int y)
{
    return x > y ? x : y;
}

GLFWmonitor* get_current_monitor(GLFWwindow *window)
{
    int nmonitors, i;
    int wx, wy, ww, wh;
    int mx, my, mw, mh;
    int overlap, bestoverlap;
    GLFWmonitor *bestmonitor;
    GLFWmonitor **monitors;
    const GLFWvidmode *mode;

    bestoverlap = 0;
    bestmonitor = NULL;

    glfwGetWindowPos(window, &wx, &wy);
    glfwGetWindowSize(window, &ww, &wh);
    monitors = glfwGetMonitors(&nmonitors);

    for (i = 0; i < nmonitors; i++) {
        mode = glfwGetVideoMode(monitors[i]);
        glfwGetMonitorPos(monitors[i], &mx, &my);
        mw = mode->width;
        mh = mode->height;

        overlap =
            maxi(0, mini(wx + ww, mx + mw) - maxi(wx, mx)) *
            maxi(0, mini(wy + wh, my + mh) - maxi(wy, my));

        if (bestoverlap < overlap) {
            bestoverlap = overlap;
            bestmonitor = monitors[i];
        }
    }

    return bestmonitor;
}