opengl-intro: osvetlitev.c

#include <GL/glut.h>

float kvadrat() 
{
  glPushMatrix();
  glTranslatef(0.0, 0.0, 1.0);
  glNormal3f(0.0, 0.0, 1.0);
  glRectf(-1.0, -1.0, 1.0, 1.0);
  glPopMatrix();
}

void display()
{
  glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
  glColor3f(0.7, 0.6, 0.2);
  glPushMatrix();
  glScalef(0.5, 0.5, 0.5);
  kvadrat();
  glRotatef(90.0, 0.0, 1.0, 0.0);
  kvadrat();
  glRotatef(90.0, 0.0, 1.0, 0.0);
  kvadrat();
  glRotatef(90.0, 0.0, 1.0, 0.0);
  kvadrat();
  glRotatef(90.0, 1.0, 0.0, 0.0);
  kvadrat();
  glRotatef(180.0, 1.0, 0.0, 0.0);
  kvadrat();
  glPopMatrix();
  glFlush();
}

void reshape (int w, int h)
{
  double l;
  l = 1.0;
  glViewport (0, 0, w, h);
  glMatrixMode (GL_PROJECTION);
  glLoadIdentity();
  glOrtho(-l, l, -l, l, -l, l);
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
  glRotatef(30.0, 1.0, 0.0, 0.0);
  glRotatef(30.0, 0.0, 1.0, 0.0);
}


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