// The famous DVD screensaver.

#include <pspkernel.h>
#include "../../glib2d.h"

PSP_MODULE_INFO("App",0,1,1);
PSP_MAIN_THREAD_ATTR(THREAD_ATTR_USER | THREAD_ATTR_VFPU);

/* Callbacks */
int exit_callback(int arg1, int arg2, void *common) {
  sceKernelExitGame();
  return 0; }
int CallbackThread(SceSize args, void *argp) {
  int cbid;
  cbid = sceKernelCreateCallback("Exit Callback", exit_callback, NULL);
  sceKernelRegisterExitCallback(cbid);
  sceKernelSleepThreadCB();
  return 0; }
int SetupCallbacks() {
  int thid = 0;
  thid = sceKernelCreateThread("update_thread", CallbackThread, 0x11, 0xFA0, 0, 0);
  if(thid >= 0) sceKernelStartThread(thid, 0, 0);
  return thid; }

int main()
{
  SetupCallbacks();
  
  int size = 42, x=0, y=0, dx=2, dy=2;

  while (1)
  {
    x += dx;
    y += dy;
    if (x < 0 || x+size > G_SCR_W) dx = -dx; 
    if (y < 0 || y+size > G_SCR_H) dy = -dy;
     
    gClear(WHITE);
    
    gBeginRects(NULL); // No texture
    gSetColor(AZURE);
    gSetScaleWH(size,size);
    gSetCoordXY(x,y);
    gSetAlpha(x*255/G_SCR_W); // Useless alpha effect ;)
    gAdd();
    gEnd();
    
    gFlip(G_TRUE); // Vsync enabled
  }
    
  sceKernelExitGame();
  return 0;
}
