مشکل در opengl "لطفا کمک کنید"

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سلام دوستان و اساتید
من چند تا برنامه ی opengl گرفتم که وقتی اجراشون می کنم،به جای اینکه خروجی ظاهر شه.
صفحه سفید می شه.
مشکل از چیه؟
مثلا همین برنامه ای که آقای ادمین گذاشتن توو سایت
ستاره ای که با کیبورد جابه جا میشه
این کدش:

#include"stdafx.h"#include<iostream>
#include<glut.h>
#include <math.h>




// Define a constant for the value of PI
#define GL_PI 3.1415f


// Rotation amounts
static GLfloat xRot = 0.0f;
static GLfloat yRot = 0.0f;


// Flags for effects
#define MODE_SOLID 0
#define MODE_LINE  1
#define MODE_POINT 2


int iMode = MODE_SOLID;
GLboolean bEdgeFlag = TRUE;


///////////////////////////////////////////////////////////////////////////////
// Reset flags as appropriate in response to menu selections
void ProcessMenu(int value)
    {
    switch(value)
        {
        case 1:
            iMode = MODE_SOLID;
            break;


        case 2:
            iMode = MODE_LINE;
            break;


        case 3:
            iMode = MODE_POINT;
            break;


        case 4:
            bEdgeFlag = TRUE;
            break;


        case 5:
        default:
            bEdgeFlag = FALSE;
            break;
        }


    glutPostRedisplay();
    }




// Called to draw scene
void RenderScene(void)
    {
    // Clear the window
    glClear(GL_COLOR_BUFFER_BIT);




    // Draw back side as a polygon only, if flag is set
    if(iMode == MODE_LINE)
        glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);


    if(iMode == MODE_POINT)
        glPolygonMode(GL_FRONT_AND_BACK,GL_POINT);


    if(iMode == MODE_SOLID)
        glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);




    // Save matrix state and do the rotation
    glPushMatrix();
    glRotatef(xRot, 1.0f, 0.0f, 0.0f);
    glRotatef(yRot, 0.0f, 1.0f, 0.0f);




    // Begin the triangles
    glBegin(GL_TRIANGLES);


        glEdgeFlag(bEdgeFlag);
        glVertex2f(-20.0f, 0.0f);
        glEdgeFlag(TRUE);
        glVertex2f(20.0f, 0.0f);
        glVertex2f(0.0f, 40.0f);


        glVertex2f(-20.0f,0.0f);
        glVertex2f(-60.0f,-20.0f);
        glEdgeFlag(bEdgeFlag);
        glVertex2f(-20.0f,-40.0f);
        glEdgeFlag(TRUE);


        glVertex2f(-20.0f,-40.0f);
        glVertex2f(0.0f, -80.0f);
        glEdgeFlag(bEdgeFlag);
        glVertex2f(20.0f, -40.0f);        
        glEdgeFlag(TRUE);


        glVertex2f(20.0f, -40.0f);        
        glVertex2f(60.0f, -20.0f);
        glEdgeFlag(bEdgeFlag);
        glVertex2f(20.0f, 0.0f);
        glEdgeFlag(TRUE);


        // Center square as two triangles
        glEdgeFlag(bEdgeFlag);
        glVertex2f(-20.0f, 0.0f);
        glVertex2f(-20.0f,-40.0f);
        glVertex2f(20.0f, 0.0f);
        
        glVertex2f(-20.0f,-40.0f);
        glVertex2f(20.0f, -40.0f);
        glVertex2f(20.0f, 0.0f);
        glEdgeFlag(TRUE);
    
    // Done drawing Triangles
    glEnd();


    // Restore transformations
    glPopMatrix();


    // Flush drawing commands
    glutSwapBuffers();
    }


// This function does any needed initialization on the rendering
// context. 
void SetupRC()
    {
    // Black background
    glClearColor(0.0f, 0.0f, 0.0f, 1.0f );


    // Set drawing color to green
    glColor3f(0.0f, 1.0f, 0.0f);
    }


void SpecialKeys(int key, int x, int y)
    {
    if(key == GLUT_KEY_UP)
        xRot-= 5.0f;


    if(key == GLUT_KEY_DOWN)
        xRot += 5.0f;


    if(key == GLUT_KEY_LEFT)
        yRot -= 5.0f;


    if(key == GLUT_KEY_RIGHT)
        yRot += 5.0f;


    if(key > 356.0f)
        xRot = 0.0f;


    if(key < -1.0f)
        xRot = 355.0f;


    if(key > 356.0f)
        yRot = 0.0f;


    if(key < -1.0f)
        yRot = 355.0f;


    // Refresh the Window
    glutPostRedisplay();
    }




void ChangeSize(int w, int h)
    {
    GLfloat nRange = 100.0f;


    // Prevent a divide by zero
    if(h == 0)
        h = 1;


    // Set Viewport to window dimensions
    glViewport(0, 0, w, h);


    // Reset projection matrix stack
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();


    // Establish clipping volume (left, right, bottom, top, near, far)
    if (w <= h) 
        glOrtho (-nRange, nRange, -nRange*h/w, nRange*h/w, -nRange, nRange);
    else 
        glOrtho (-nRange*w/h, nRange*w/h, -nRange, nRange, -nRange, nRange);


    // Reset Model view matrix stack
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    }


int main(int argc, char* argv[])
    {
    int nModeMenu;
    int nEdgeMenu;
    int nMainMenu;


    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
    glutCreateWindow("Solid and Outlined Star");
    
    // Create the Menu
    nModeMenu = glutCreateMenu(ProcessMenu);
    glutAddMenuEntry("Solid",1);
    glutAddMenuEntry("Outline",2);
    glutAddMenuEntry("Points",3);


    nEdgeMenu = glutCreateMenu(ProcessMenu);
    glutAddMenuEntry("On",4);
    glutAddMenuEntry("Off",5);


    nMainMenu = glutCreateMenu(ProcessMenu);
    glutAddSubMenu("Mode", nModeMenu);
    glutAddSubMenu("Edges", nEdgeMenu);
    glutAttachMenu(GLUT_RIGHT_BUTTON);
    
    glutReshapeFunc(ChangeSize);
    glutSpecialFunc(SpecialKeys);
    glutDisplayFunc(RenderScene);
    SetupRC();
    glutMainLoop();


    return 0;
    }

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