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CFLAGS    = -I c:\gba\include -c -g -O2 -mthumb-interwork -Wall -ffreestanding
ASFLAGS    = -mthumb-interwork
LDFLAGS = -L c:\gba\lib -T gbarom2mb

all : ufgbass.bin

ufgbass.bin : ufgbass.elf
    objcopy -v -O binary ufgbass.elf ufgbass.bin

ufgbass.elf : main.o
    ld $(LDFLAGS) -o ufgbass.elf main.o

main.o : main.c
    gcc $(CFLAGS) main.c

 // react to joypad presses
  while(1)
  {
    // copy current index
    imgNew = imgCurrent;
    if (!(PADREG & PAD_RIGHT)) imgNew++;
    if (!(PADREG & PAD_LEFT)) imgNew--;
    // wrap around if neccesary
    if (imgNew < 0) imgNew = imgCount - 1;
    if (imgNew >= imgCount) imgNew = 0;
    // copy image
    if (imgNew != imgCurrent)
    {
      waitVSync();
      copyImage(pScreen, imageinfo.list->start[imgNew]);
      imgCurrent = imgNew;
      // wait keyDelay frames
      for(keyDelayCount = keyDelay; keyDelayCount > 0; keyDelayCount--) 
      {
        // next time use shorter delay
        keyDelay = KEYREPEATDELAY;
        waitVSync();
        // both keys are released ?
        if ((PADREG & PAD_RIGHT) && (PADREG & PAD_LEFT)) 
        {
          // use initial delay 
          keyDelay = KEYWAITDELAY;
          // break from loop
          break;
        }
      }
    }
  }
}