#include <MiniFB.h>
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>

#define DIMEN_LOW      512
static unsigned int g_buffer_low[DIMEN_LOW * DIMEN_LOW];

#define DIMEN_HIGH      (2*DIMEN_LOW)
static unsigned int g_buffer_high[DIMEN_HIGH * DIMEN_HIGH];

void
pretty_square(unsigned int *p, int dimen)
{
  memset(p, 127, dimen*dimen*4);
  const int one_half_dimen = dimen / 2;
  const int one_quarter_dimen = one_half_dimen / 2;
  const int three_quarter_dimen = one_half_dimen + one_quarter_dimen;
  for (int x = one_quarter_dimen; x < three_quarter_dimen; x++)
    for (int y = one_quarter_dimen; y < three_quarter_dimen; y++)
      p[y*dimen + x] = (x & 1) ? MFB_RGB(223,0,(255*(x-one_quarter_dimen))/one_half_dimen) : MFB_RGB(0,0,0);
}

int 
main()
{
  pretty_square(g_buffer_low, DIMEN_LOW);
  pretty_square(g_buffer_high, DIMEN_HIGH);

  struct mfb_window *window_low = mfb_open("LowRes", DIMEN_LOW, DIMEN_LOW);
  struct mfb_window *window_high = mfb_open("HighRes", DIMEN_HIGH/2, DIMEN_HIGH/2);

  while (window_high || window_low)
    {
      if (window_low)
	if (mfb_update_ex(window_low, g_buffer_low, DIMEN_LOW, DIMEN_LOW) != STATE_OK
	      || !mfb_wait_sync(window_low))
	    window_low = NULL;

      if (window_high)
	if (mfb_update_ex(window_high, g_buffer_high, DIMEN_HIGH, DIMEN_HIGH) != STATE_OK
	    || !mfb_wait_sync(window_high))
	  window_high = NULL;
    }
  
  return 0;
}