gistfile1.cpp

#include <math.h>
#include <stdlib.h>
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
#include <windows.h>
#endif
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>
#include <stdio.h>
const int screenWidth = 600;
const int screenHeight = 600;
void onInitialization( ) {
  glViewport(0, 0, screenWidth, screenHeight);
  glMatrixMode(GL_PROJECTION);
  gluPerspective(60,1,1,1000);
  glMatrixMode(GL_MODELVIEW);
  glEnable(GL_NORMALIZE);
  glEnable(GL_DEPTH_TEST);
  glEnable(GL_LIGHTING);
  glEnable(GL_LIGHT0);
  float ambient[]={.3,.3,.3},diffuse[]={.8,.8,.8,1};
  glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
  glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
  glMaterialfv(GL_FRONT_AND_BACK,GL_AMBIENT,ambient);
}
int res=2;
void onDisplay() {
  float t = glutGet(GLUT_ELAPSED_TIME);
  float s = sin(t/500)*5;
  float c = cos(t/500)*5;
  glClearColor(0.1f, 0.2f, 0.3f, 1.0f);
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  glPushMatrix();
    gluLookAt(20,20,10,0,0,0,0,0,1);
    float position[]={s,c,1,1};
    glLightfv(GL_LIGHT0, GL_POSITION, position);
    float col[]={.7,.7,.7};
    glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, col);
    glBegin(GL_TRIANGLES);
    for(int i=0;i<res;i++) {
      for(int j=0;j<res;j++) {
        float x0 = -10+i*(20./res);
        float y0 = -10+j*(20./res);
        float x1 = x0+20./res;
        float y1 = y0+20./res;
        glVertex2f(x0, y0);
        glVertex2f(x1, y0);
        glVertex2f(x1, y1);
        glVertex2f(x0, y0);
        glVertex2f(x1, y1);
        glVertex2f(x0, y1);
      }
    }
    glEnd();
  glPopMatrix();
  glutSwapBuffers();
}
void onIdle() { glutPostRedisplay(); }
void onKeyboard(unsigned char k, int x, int y) {
  res += k == 'k';
  res -= k == 'j';
  res = res < 1 ? 1 : res;
  glutPostRedisplay();
}
int main(int argc, char **argv) {
  glutInit(&argc, argv);
  glutInitWindowSize(600, 600);
  glutInitWindowPosition(100, 100);
  glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
  glutCreateWindow("Grafika funky feladat");
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  onInitialization();
  glutDisplayFunc(onDisplay);
  glutIdleFunc(onIdle);
  glutKeyboardFunc(onKeyboard);
  glutMainLoop();
  return 0;
}