Simple GLUT sample code

CMakeLists.txt

PROJECT(Basic CXX)
set(CMAKE_CXX_FLAGS "-std=c++11 -Wall -O3")
cmake_minimum_required(VERSION 2.6)
ADD_EXECUTABLE(Basic main.cpp)
TARGET_LINK_LIBRARIES(Basic freeglut opengl32 glu32)

main.cpp

#include <iostream>
#include <cstdlib>

#include <GL/glut.h>
 
GLfloat spin=0.0;
 
void init(void)
{
    glClearColor(0.0,0.0,0.0,0.0);
    glShadeModel(GL_FLAT);
}
 
void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    glPushMatrix();
    glRotatef(spin,0.0,0.0,1.0);
    glColor3f(0.0,1.0,0.0);
    glRectf(-25.0,0.0,25.0,25.0);

    glColor3f(0.0,0.0,1.0);
    glRectf(-25.0,50.0,25.0,75.0);

    glColor3f(1.0,0.0,0.0);
    glRectf(-25.0,-50.0,25.0,-25.0);

    glPopMatrix();
    glutSwapBuffers();
}
 
void spinDisplay(void)
{
    spin=spin+1.0;
 
    if(spin>360.0) spin=spin-360.0;
 
    glutPostRedisplay();
}
 
void reshape(int w, int h)
{
    glViewport(0,0,(GLsizei) w, (GLsizei) h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-50.0,50.0,0.0,100.0,-1.0,1.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}
 
void mouse(int button,int state,int x,int y)
{
    switch(button)
    {
    case GLUT_LEFT_BUTTON:
        if (state==GLUT_DOWN) glutIdleFunc(spinDisplay); break;
 
    case GLUT_RIGHT_BUTTON: if (state==GLUT_DOWN) glutIdleFunc(NULL); break;
    }
}

void keyboard(unsigned char key, int x, int y) {
    if (key == 27) { std::exit(0); }
    if (key == 'g') { glutIdleFunc(spinDisplay); return; }
    if (key == 's') { glutIdleFunc(0); return; }
}

int main(int argc, char *argv[])
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
    glutInitWindowSize(250,250);
    glutInitWindowPosition(100,100);
    glutCreateWindow("FreeGLUT Test!");
    init();
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutMouseFunc(mouse);
    glutKeyboardFunc(keyboard);
    glutMainLoop();
 
    return 0;
}