问GLFW无响应全屏窗口

EN

#include <stdio.h>
#include <stdlib.h>

// glfw32 - 2.7.8
#include <GL\glfw.h>

#pragma comment (lib, "GLFW.lib")
#pragma comment (lib, "opengl32.lib")

using namespace std;

// constants and globals
const int WINDOW_WIDTH=400, WINDOW_HEIGHT=400;
static bool fullscreen=false;

// function declarations
void GLFWCALL KeyboardCallback(int key, int action);
void FatalError(const char* msg) {
  fprintf(stderr, "ERROR: Failure in \"%s\"\n", msg);
  exit(1);
}


int main() {
  // ititialize GLFW
  glfwInit();
  glfwEnable(GLFW_MOUSE_CURSOR);
  glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 3);
  glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, 3);

  // initial window, 400x400 with 32-bit depth buffer in windowed mode
  glfwOpenWindow(WINDOW_WIDTH, WINDOW_HEIGHT, 0,0,0,0, 32, 0, GLFW_WINDOW);
  glfwSetWindowTitle("Simple Title");
  glfwSetWindowPos(0, 0);

  // set custom keyboard callback
  glfwSetKeyCallback(KeyboardCallback);

  while (true) {  // loop until exit
    glClear(GL_COLOR_BUFFER_BIT);
    glfwSwapBuffers();  

    // debug
    //printf("Looping...\n");
    if ( glfwGetKey(GLFW_KEY_ESC) ) {break;} 
  }

  glfwTerminate();
  printf("\nHave a nice day\n");
  return 0;
}


void GLFWCALL KeyboardCallback(int key, int action) {
  //printf("In keyboard function\n");

  if (action) {    // if key DOWN,
    switch(key) {  // do something...
      case 'f':
      case 'F':  {
        fullscreen = !fullscreen;
        printf("Toggle Fullscreen: %s\n", (fullscreen ? "On" : "Off"));
        glfwCloseWindow();

        if (! glfwOpenWindow(WINDOW_WIDTH, WINDOW_HEIGHT, 0,0,0,0, 32, 0,
                             fullscreen ? GLFW_FULLSCREEN : GLFW_WINDOW)) {
          FatalError("toggle fullscreen");
        }
        glfwSetWindowTitle("New Title");
        break;
      }

      case GLFW_KEY_ESC:  {
        printf("\nGoodbye cruel world...\n");
        glfwTerminate();
        exit(0);
      }

      default:  {
        printf("Key not implemented: %c\n", key);
        break;
      }
    }
  }
  printf("Exiting keyboard function\n");
}