opengl-intro: text.c

#include <GL/glut.h>                                                  
                                                                                                               
float kvadrat(char *s)
{
  char *c;
  glPushMatrix();
  glTranslatef(0.0, 0.0, 1.0);
  glNormal3f(0.0, 0.0, 1.0);
  glRectf(-1.0, -1.0, 1.0, 1.0);
  glTranslatef(-0.8, 0.0, 0.01);
  glDisable(GL_LIGHTING);
  glScalef(0.003, 0.003, 0.003);
  glColor3f(1.0, 0.0, 0.0);
  for(c=s; *c; c++)
  {
    glutStrokeCharacter(GLUT_STROKE_ROMAN, *c);
  }
  glEnable(GL_LIGHTING);
  glPopMatrix();
}

void display()
{
  float mat[4]={0.9, 0.6, 0.3, 1.0};
  glClear(GL_COLOR_BUFFER_BIT);
  glClear(GL_DEPTH_BUFFER_BIT);
  glPushMatrix();
  glRotatef(30.0, 1.0, 0.0, 0.0);
  glRotatef(30.0, 0.0, 1.0, 0.0);
  glScalef(0.5, 0.5, 0.5);
  glMaterialfv(GL_FRONT, GL_DIFFUSE, mat);
  kvadrat("Spredaj");
  glRotatef(90.0, 0.0, 1.0, 0.0);
  kvadrat("Desno");
  glRotatef(90.0, 0.0, 1.0, 0.0);
  kvadrat("Zadaj");
  glRotatef(90.0, 0.0, 1.0, 0.0);
  kvadrat("Levo");
  glRotatef(90.0, 1.0, 0.0, 0.0);
  kvadrat("Spodaj");
  glRotatef(180.0, 1.0, 0.0, 0.0);
  kvadrat("Zgoraj");
  glPopMatrix();
  glFlush();
}

void reshape (int w, int h)
{
  double l;
  l = 1;
  glViewport (0, 0, w, h);
  glMatrixMode (GL_PROJECTION);
  glLoadIdentity();
  glOrtho(-l, l, -l, l, -l, l);
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
}

int main(int argc, char *argv[])
{
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_SINGLE|GLUT_DEPTH);
  glutCreateWindow("C GLUT program");
  glutDisplayFunc(display);
  glutReshapeFunc(reshape);
  glEnable(GL_DEPTH_TEST);
  glEnable(GL_LIGHTING);
  glEnable(GL_LIGHT0);
  glClearColor(1.0, 1.0, 1.0, 1.0);
  glutMainLoop();
  return 0;
}