Some Basic GLUT

#include <GLUT/GLUT.h>
#include <iostream>

void render(void);

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

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

int main(int argc, char** argv) {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
    glutInitWindowPosition(100, 100);
    glutInitWindowSize(640, 480);
    glutCreateWindow("Simple GLUT Application");

    glutDisplayFunc(render);
    glutKeyboardFunc(keyboard);
    glutMouseFunc(mouse);

    glutMainLoop();
}

void keyboard(unsigned char c, int x, int y) {
    if (c == 27) {
        exit(0);
    }
}

void mouse(int button, int state, int x, int y) {
    if (button == GLUT_RIGHT_BUTTON) {
        exit(0);
    }
}

void render(void) {
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glBegin(GL_TRIANGLES);
        glColor3f(1, 0, 0);
        glVertex2f(-0.5, -0.5);
        glColor3f(0, 1, 0);
        glVertex2f(0.5, -0.5);
        glColor3f(0, 0, 1);
        glVertex2f(0.0, 0.5);
    glEnd();

    glutSwapBuffers();
}