glfw focus test

windowsglfw.c

#include <GLFW/glfw3.h>
#include <stdio.h>

void error_callback(int error, const char* description)
{
    fprintf(stderr, "Error: %s\n", description);
}

void function_name(GLFWwindow* window, int focused) {
    printf("Focus event %d\n", focused);
}

int main() {
    glfwInit();

    glfwSetErrorCallback(error_callback);

    glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);

    GLFWwindow* window = glfwCreateWindow(640, 480, "My Title", NULL, NULL);
    if (!window)
    {
	    printf("Creation of window failed!\n");
	    return 0;
    }
    glfwSetWindowFocusCallback(window, function_name);

    while (!glfwWindowShouldClose(window)) {
	    glfwPollEvents();
    }

    glfwDestroyWindow(window);

    glfwTerminate();
    return 0;
}