#include <iostream>
#include <GL/glut.h>

bool a;
bool b;
bool c;

void init(void)
{
    glClearColor(0.5,0.5,0.5,0.0);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0.0,1.0,0.0,1.0,-1.0,1.0);
}

void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(0.0,0.0,1.0);

    if(a)
    {
    glBegin(GL_POLYGON);
    glVertex3f(0.0,0.0,0.0);
    glVertex3f(1.0,0.0,0.0);
    glVertex3f(0.5,1.0,0.0);
    glEnd();
    }
    glColor3f(0.0,1.0,1.0);
    if(b)
    {
    glBegin(GL_POLYGON);
    glVertex3f(0.0,0.0,0.0);
    glVertex3f(1.0,0.0,0.0);
    glVertex3f(0.8,1.0,0.0);
    glEnd();
    }
    glColor3f(0.0,1.0,0.0);

    if(c)
    {
    glBegin(GL_POLYGON);
    glVertex3f(0.0,0.0,0.0);
    glVertex3f(1.0,0.0,0.0);
    glVertex3f(0.2,1.0,0.0);
    glEnd();
    }
    glFlush();
}

void mouse(int button,int state,int x,int y)
{
switch(button)
{
case GLUT_LEFT_BUTTON:
a = !a; break;
case GLUT_MIDDLE_BUTTON:
b = !b; break;
case GLUT_RIGHT_BUTTON:
c = !c; break;
}
}

void key(unsigned char k, int x, int y)
{
    switch(k)
    {
        case 'F':
        case 'f':std::cout << "вы нажали f"; break;
    }
}

int main(int argc, char **argv)
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
    glutInitWindowSize(800,600);
    glutInitWindowPosition(100, 200);
    glutCreateWindow("X-Ray engine v0.1");
    init();
    glutDisplayFunc(display);
    glutIdleFunc(display);
    glutMouseFunc(mouse);
//  glutKeyboardFunc(key);
    glutMainLoop();
    return 0;
}