OpenGL Screencast 17: Animation part 2

017.c

#include "screencasts.h"

/*
 *  main()
 *  ----
 *  Start up GLUT and tell it what to do
 */
int main(int argc,char* argv[])
{
  initializeGlobals();
  /* screencast specific variables */
  windowName = "OpenGL screenscasts 17: Animation part 2";
  screencastID = 17;
  toggleAxes = 0;
  toggleAnimation = 0;

  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
  glutInitWindowSize(windowWidth,windowHeight);
  glutInitWindowPosition(450,350);
  glutCreateWindow(windowName);

  glutDisplayFunc(display);
  glutReshapeFunc(displayReshape);
  glutKeyboardFunc(windowKey);
  glutSpecialFunc(windowSpecial);

  initializeTextures();
  initializeObjs();
  timer(toggleAnimation);

  redisplayAll();
  glutMainLoop();
  return 0;
}

animate.c

#include "screencasts.h"

/*
 * moveCube()
 * ------
 * Rotates a cube if animations are on
 */
void moveCube(void)
{
  cubes[0].tsr.r.y = fmod(cubes[0].tsr.r.y+4.0,360.0);
}

/*
 * moveLight()
 * ------
 * Moves the light if it is on
 */
void moveLight(void)
{
  if (toggleLight) lightPh = (lightPh+2)%360;
}

/*
 * timer()
 * ------
 * Timer called periodically
 */
void timer(int value)
{
  if (toggleAnimation != DEF_ANIMATE_PAUSED) {
    moveLight();
    moveCube();
  }
  /*
   * glutTimerFunc(millisecs, timerCallback, value)
   *   millisecs = how long until you want the callback to be called
   *   timerCallback = the function to be called when time is up
   *   value = can be used for whatever. I'm using it toggle the animation
   */
  glutTimerFunc(20,timer,toggleAnimation);

  redisplayAll();
}

initialization.c

/*
 * initializeObjs(void)
 * ------
 * Initializes all of our objects
 */
void initializeObjs(void)
{
  cube_s cb = {{{0,0,0},{2,2,2},{0,0,0}}};
  cubes[0] = cb;
}

structs.h

typedef struct point {
  float x;
  float y;
  float z;
} point;

typedef struct tsr {
  point t; /* translation */  
  point s; /* scale */
  point r; /* rotation */
} tsr;

typedef struct cube_s {
  tsr tsr;
} cube_s;