#include "pc_stuff.h"

#define INPUT_STATUS (0x03da)
#define VBLANK (0x08)
#define BIOS_SET_VIDEO_MODE   (0x00)

byte *VGA = (byte *)0xA0000;

void setVideoMode(byte videoMode) {
  union REGS regs;

  regs.h.ah = BIOS_SET_VIDEO_MODE;
  regs.h.al = videoMode;
  int386(BIOS_VIDEO_INTERRUPT, &regs, &regs);
}

void waitStartVbl() {
    while (inp(INPUT_STATUS) & VBLANK);
}

void waitEndVbl() {
    while (!(inp(INPUT_STATUS) & VBLANK));
}