我輸入了glutPostRedisplay（）;但它不刷新窗口和/或輸出？

Question

當我嘗試運行這段代碼時，它只是在退出函數後發佈輸出，我不明白爲什麼它不起作用。我知道代碼很長，因爲我在學習OpenGL的同時製作了一個遊戲，並且試圖儘可能使其跨平臺。在關閉窗口之前，第80行沒有執行。 有人可以找出並解決問題，還是因爲我的怪異遊戲設計？

如果這裏存在兼容性問題是規格：

的ArchLinux下（x86_64）與XFCE4 編譯器是gcc

#include <GL/glut.h> 
#include <stdio.h> 
#ifdef WIN32 // Will need this later 
#include <io.h> 
#include <windows.h> 
#elif _POSIX_C_SOURCE >= 199309L 
#include <time.h> // for nanosleep 
#include <unistd.h> 
#else 
#include <unistd.h> // for usleep 
#endif 

/** 
    By default it should be 
    UP - move on negative z axis 
    DOWN - move on positive z axis 
    LEFT - move left relative to the camera (mostly negative x axis) 
    RIGHT - move right relative to the camera (mostly positive x axis) 
    SPACE - jump (fxp. decreasing the Z value) 
**/ 

unsigned char controls[5],areyougoingtoexit; 
unsigned char configurationdone,ingame = 0; 
FILE *configuration; 
unsigned short displayx,displayy,displaymode; 
int winIDMain; 

void mainmenurender(void); 

void mainmenukeyboard(unsigned char c, int x, int y); 

void mainmenumouse(int button, int state, int x, int y); 

idle(void){ //To prevent compilation errors ,thats why I puted it infront of the code 
    glutSetWindow(winIDMain); 
    glutPostRedisplay(); 

} 

int main(int argc, char* argv) { 
    while(1){ 
     if(configurationdone){ 
     glutInit(&argc, argv); 
      glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA); 
      glutInitWindowPosition(100, 100); 
      glutInitWindowSize(displayx, displayy); 
     winIDMain = glutCreateWindow("GL Game"); 

      if(ingame == 0){ 
       glutSetWindow(winIDMain); 
       glutDisplayFunc(mainmenurender);  
       glutKeyboardFunc(mainmenukeyboard); 
       glutMouseFunc(mainmenumouse); 
       glutIdleFunc (idle); 
      } 
      if(displaymode == 1){ 
       glutFullScreen(); 
      } 

      glutMainLoop(); 
     }else{ 
      loadconfiguration(); 
     } 
    } 
} 

void mainmenukeyboard(unsigned char c, int x, int y) { 
     if (c == 27) { 
     if(displaymode == 1) 
        displaymode == 0; 
     else 
      displaymode == 1; 
     } 
} 


void mainmenumouse(int button, int state, int x, int y) { 
    int perpartpixels = glutGet(GLUT_WINDOW_HEIGHT)/40; //Aproxx 5% of the resolution 
    if (button == GLUT_LEFT_BUTTON){ 
     printf("X:%d Y:%d",x,y); 
     if((y >= perpartpixels * 3 && y <= perpartpixels * 3 + 15) && (x >= 0 && x <= 81)){ 
      printf("Play"); 
     }else if((y >= perpartpixels * 4 && y <= perpartpixels * 4 + 15) && (x >= 0 && x <= 72)){ 
      printf("Settings"); 
     }else if((y >= perpartpixels * 5 && y <= perpartpixels * 5 + 15) && (x >= 0 && x <= 36)){ 
      exit(0); 
     } 
    }   
    if (button == GLUT_RIGHT_BUTTON) { 
       exit(0); 
     } 
} 

void mainmenurender(void) { 
    glutSetWindow(winIDMain); 
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
    glLoadIdentity(); 

    char mainmenustring[9] = "Main Menu"; 
    glColor3f(1, 1, 1); 
    glRasterPos2f(-1, 0.9); 
    int mainmenulen, mainmenui; 
    mainmenulen = (int)strlen(mainmenustring); 
    for (mainmenui = 0; mainmenui < mainmenulen; mainmenui++) { 
     glutBitmapCharacter(GLUT_BITMAP_9_BY_15, mainmenustring[mainmenui]); 
    } 
    char startstring[5] = "Start"; 
    glColor3f(1, 1, 1); 
    glRasterPos2f(-1, 0.8); 
    int startlen, starti; 
    startlen = (int)strlen(startstring); 
    for (starti = 0; starti < startlen; starti++) { 
     glutBitmapCharacter(GLUT_BITMAP_9_BY_15, startstring[starti]); 
    } 
    char settingsstring[8] = "Settings"; 
    glColor3f(1, 1, 1); 
    glRasterPos2f(-1, 0.75); 
    int settingslen, settingsi; 
    settingslen = (int)strlen(settingsstring); 
    for (settingsi = 0; settingsi < settingslen; settingsi++) { 
     glutBitmapCharacter(GLUT_BITMAP_9_BY_15, settingsstring[settingsi]); 
    } 
    char exitstring[9] = "Exit"; 
    glColor3f(1, 1, 1); 
    glRasterPos2f(-1, 0.7); 
    int exitlen, exiti; 
    exitlen = (int)strlen(exitstring); 
    for (exiti = 0; exiti < exitlen; exiti++) { 
     glutBitmapCharacter(GLUT_BITMAP_9_BY_15, exitstring[exiti]); 
    } 
     glutSwapBuffers(); 
} 






// Load config functions 
int loadconfiguration(void) { 
    //Default variables 
    char defaultcontrolconfig[5] = { 0x18, 0x19, 0x1A, 0x1B, 0x20 }; //UP,DOWN,LEFT,RIGHT,SPACE(JUMP) 
    unsigned short defaultx = 640,defaulty = 480,defaultmode = 0; //X RES,Y RES, FULLSCREENMODE (0 NO ,1 YES) 
    //Check if config folder is present otherwise create it 
    int result = mkdir("configuration", 0777); 
    if(result == -1){ 
     printf("Ignore creating folder:\nError -1 Directory already exists\n"); 
    }else if(result != 0){ 
     printf("Error: %d while creating configuration folder\n", result); 
    } 
    //Check if control configuration is present otherwise create it 
    if (access("configuration/controls.conf",F_OK)!= -1) 
    { 
     printf ("Found controls configuration file\n"); 
     configuration = fopen("configuration/controls.conf", "rb"); 
    } 
    else 
    { 
     configuration = fopen("configuration/controls.conf", "wb"); 
     fwrite(defaultcontrolconfig,1,5,configuration); 
    } 
    fread(controls,1,5,configuration); 
    printf("Finished loading controls configuration\n"); 
    fclose(configuration); 

    //Check if display configuration is present otherwise create it 
    if (access("configuration/display.conf",F_OK)!= -1) 
    { 
     printf ("Found display configuration file\n"); 
     configuration = fopen("configuration/display.conf", "rb"); 
    } 
    else 
    { 
     configuration = fopen("configuration/display.conf", "wb"); 
     fprintf(configuration,"%hd\n%hd\n%hd",defaultx,defaulty,defaultmode); 
    } 
    rewind(configuration); 
    fscanf(configuration,"%hd\n%hd\n%hd",&displayx,&displayy,&displaymode); 
    printf("Finished loading display configuration\n"); 
    fclose(configuration); 


    printf("Finished loading configurations\n"); 
    configurationdone = 1; 
    return 0; 
} 

Answer 1

我想通了myself.The程序只能在供過於求顯示輸出函數（我實際上在說什麼是glutDisplayFunc（）;）。