Мое окно оценивает в OpenGL

Я хочу сделать размер моего окна (800 800), однако команда GL

glutInitWindowSize(800, 500);

Это никак не влияет на мой код. Ниже приведен исходный код.

#include <stdio.h>
#include <stdlib.h>
#include <X11/X.h>
#include <X11/Xlib.h>
#include <GL/gl.h>
#include <GL/glx.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <iostream>
#include <math.h>
using namespace std;

struct point{

GLfloat x;
GLfloat y;

};

float a,b;

void initGL() {
// Set "clearing" or background color
glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // Black and opaque
}

/* Handler for window-repaint event. Call back when the window first appears and
whenever the window needs to be re-painted. */
void display() {
glClear(GL_COLOR_BUFFER_BIT);   // Clear the color buffer with current clearing color
//  glutInitWindowSize(800, 800);

float i;
float radians;
struct point graph[1000];
struct point graphC[1000];

for(i = 0.0; i < 1000.0; i++) {
graph[(int)i].x = i/1000.0;
graph[(int)i].y = sqrt(pow(i/100,3) + a*i/100.0 + b)/10.0;
graphC[(int)i].x = i/1000;
graphC[(int)i].y = -1*sqrt(pow(i/100,3) + a*i/100.0 + b)/10.0;
}

glBegin(GL_POINTS);

for(int j = 0; j < 1000; j ++){
glColor3f(1.0f, 0.0f, 0.0f);
glVertex2f(graph[j].x,graph[j].y);
glColor3f(1.0f, 0.0f, 0.0f);
glVertex2f(graphC[j].x,graphC[j].y);
}

glEnd();

for(i = 0.0; i > -1000.0; i--) {
graph[-1*(int)i].x = i/1000.0;
graph[-1*(int)i].y = sqrt(pow(i/100,3) + a*i/100.0 + b)/10.0;
graphC[-1*(int)i].x = i/1000;
graphC[-1*(int)i].y = -1*sqrt(pow(i/100,3) + a*i/100.0 + b)/10.0;
}

glBegin(GL_POINTS);

for(int j = 0; j < 1000; j ++){
glColor3f(1.0f, 0.0f, 0.0f);
glVertex2f(graph[j].x,graph[j].y);
glColor3f(1.0f, 0.0f, 0.0f);
glVertex2f(graphC[j].x,graphC[j].y);
}

glEnd();

glFlush();  // Render now

}

/* Main function: GLUT runs as a console application starting at main()  */
int main(int argc, char** argv) {
cout<<"Please enter in a\n";
cin>>a;
cout<<"Please enter in b\n";
cin>>b;
glutInit(&argc, argv);          // Initialize GLUT
glutCreateWindow("Scientific Plot");  // Create window with the given title
glutInitWindowSize(800, 500);   // Set the window's initial width & height
glutInitWindowPosition(400, 400); // Position the window's initial top-left corner
glutDisplayFunc(display);       // Register callback handler for window re-paint event
initGL();                       // Our own OpenGL initialization
glutMainLoop();                 // Enter the event-processing loop
return 0;
}