Как нарисовать прямоугольник с границами в OpenGL?

// GLRect.c
// Just draw a single rectangle in the middle of the screen
// OpenGL SuperBible, 3rd Edition
// Richard S. Wright Jr.
// rwright@starstonesoftware.com

#include "../../Common/OpenGLSB.h"// System and OpenGL Stuff

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

// Set current drawing color to red
// R G B
glColor3f(1.0f, 0.0f, 0.0f);

// Draw a filled rectangle with current color
glRectf(-25.0f, 25.0f, 25.0f, -25.0f);

// Flush drawing commands
glFlush();
}

///////////////////////////////////////////////////////////
// Setup the rendering state
void SetupRC(void)
{
// Set clear color to blue
glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
}

///////////////////////////////////////////////////////////
// Called by GLUT library when the window has chanaged size
void ChangeSize(int w, int h)
{
GLfloat aspectRatio;

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

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

// Reset coordinate system
glMatrixMode(GL_PROJECTION);
glLoadIdentity();

// Establish clipping volume (left, right, bottom, top, near, far)
aspectRatio = (GLfloat)w / (GLfloat)h;
if (w <= h)
glOrtho (-100.0, 100.0, -100 / aspectRatio, 100.0 / aspectRatio, 1.0, -1.0);
else
glOrtho (-100.0 * aspectRatio, 100.0 * aspectRatio, -100.0, 100.0, 1.0, -1.0);

glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}

///////////////////////////////////////////////////////////
// Main program entry point
int main(int argc, char* argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(800, 600);
glutCreateWindow("GLRect");
glutDisplayFunc(RenderScene);
glutReshapeFunc(ChangeSize);
SetupRC();
glutMainLoop();

return 0;
}
Это пример из СУПЕРКНИГИ OPENGL Липчака.
Только в инклюд надо gl.h и glut.h Ну и вашей среды инклюды. В VC++ это еще <stdafx.h>
Могу книгу скинуть.