OpenGL深度Spaz攻擊

我今天開始學習OpenGL，而且很簡單。然而，我不能爲了我的生活而按照深度繪製對象，而不是繪製順序，所以我希望有人能告訴我我做錯了什麼。OpenGL深度Spaz攻擊

這裏是非常簡單的代碼，我使用創建多維數據集：

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
    glLoadIdentity(); 

//Simple translation 

glBegin(GL_QUADS);  
    glColor3f(0.0f,1.0f,0.0f);  
    glVertex3f(1.0f, 1.0f,-1.0f);  
    glVertex3f(-1.0f, 1.0f,-1.0f);  
    glVertex3f(-1.0f, 1.0f, 1.0f);  
    glVertex3f(1.0f, 1.0f, 1.0f);  
    glColor3f(1.0f,0.5f,0.0f);  
    glVertex3f(1.0f,-1.0f, 1.0f);  
    glVertex3f(-1.0f,-1.0f, 1.0f);  
    glVertex3f(-1.0f,-1.0f,-1.0f);  
    glVertex3f(1.0f,-1.0f,-1.0f);  
    glColor3f(1.0f,0.0f,0.0f);  
    //You get the point, continue with all sides 
glEnd();   // End Drawing The Cube 

SDL_GL_SwapBuffers();

下面是設置代碼：

if (SDL_Init(SDL_INIT_EVERYTHING)<0) 
    return -1; 

SDL_GL_SetAttribute(SDL_GL_RED_SIZE,  8); 
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE,  8); 
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE,  8); 
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE,  8); 

SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE,  16); 
SDL_GL_SetAttribute(SDL_GL_BUFFER_SIZE,  32); 

SDL_GL_SetAttribute(SDL_GL_ACCUM_RED_SIZE, 8); 
SDL_GL_SetAttribute(SDL_GL_ACCUM_GREEN_SIZE, 8); 
SDL_GL_SetAttribute(SDL_GL_ACCUM_BLUE_SIZE, 8); 
SDL_GL_SetAttribute(SDL_GL_ACCUM_ALPHA_SIZE, 8); 

SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1); 
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 2); 


SDL_Surface* screen = SDL_SetVideoMode(screen_x,screen_y,32,SDL_HWSURFACE|SDL_GL_DOUBLEBUFFER|SDL_OPENGL); 

if (screen == NULL) 
    return -2; 

//glEnable(GL_DEPTH_TEST); //<-If this is uncommented look at figure 1 
glDepthFunc(GL_LESS); 

glClearColor(0, 0, 0, 0); 
glClearDepth(1.0f); 

glViewport(0, 0, screen_x, screen_y); 

glMatrixMode(GL_PROJECTION); //projection with ortho, model otherwise 
glLoadIdentity(); 

gluPerspective(60.0,1.0,0.0,10.0); 

glMatrixMode(GL_MODELVIEW); 
glLoadIdentity();

好吧，當我