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#include <io.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "system.h"
#define msleep(msec) usleep(1000*msec);
static void
gpu_write (unsigned int reg, unsigned int data)
{
IOWR (GPU_0_BASE, reg << 2, data);
}
static int
find_intersection (int x, int y, int xd, int yd, int t)
{
// super lazy - we should use the power of MATHS
while (x != t)
{
x += xd;
y += yd;
if (y < 0)
y = 0;
if (y > 479)
y = 479;
if ((y == 479) || (y == 0))
yd = -yd;
if ((x == 639) || (x == 0))
xd = -xd;
}
return y;
}
static int
dir (int a, int b)
{
if (a > b)
return 1;
if (a < b)
return -1;
return 0;
}
static void
move_bat (int *b, int db)
{
*b += dir (db, *b);
if (*b < 20)
*b = 20;
if (*b > 459)
*b = 459;
}
static void
load_sprite (void)
{
// RRR GGG BBB
// set the sprite color 111 010 000 - orange
gpu_write (4, 0x01D0);
// squirt the bromium logo into the sprite
gpu_write (0x10, 0x00C0);
gpu_write (0x11, 0x03E0);
gpu_write (0x12, 0x0FF8);
gpu_write (0x13, 0x1FFE);
gpu_write (0x14, 0x3FC7);
gpu_write (0x15, 0x3F83);
gpu_write (0x16, 0x3933);
gpu_write (0x17, 0x3987);
gpu_write (0x18, 0x3D37);
gpu_write (0x19, 0x3D37);
gpu_write (0x1a, 0x3D87);
gpu_write (0x1b, 0x3FFF);
gpu_write (0x1c, 0x1FFE);
gpu_write (0x1d, 0x07F8);
gpu_write (0x1e, 0x01E0);
gpu_write (0x1f, 0x00C0);
}
int
main (void)
{
int x, y, xd, yd;
int bat0, dbat0;
int bat1, dbat1;
int missed = 0;
printf ("Working...\n");
msleep (500);
srand (12392184);
bat0 = 100;
bat1 = 200;
load_sprite ();
while (1)
{
x = 1;
y = 1;
xd = 1;
yd = 1;
dbat0 = find_intersection (x + xd, y + yd, xd, yd, 0);
dbat1 = find_intersection (x + xd, y + yd, xd, yd, 639);
while (!missed)
{
x += xd;
y += yd;
if (y < 0)
y = 0;
if (y > 479)
y = 479;
if ((y == 479) || (y == 0))
yd = -yd;
if ((x == 639) || (x == 0))
{
xd = -xd;
yd = rand () % 7;
yd -= 3;
dbat0 = find_intersection (x + xd, y + yd, xd, yd, 0);
dbat1 = find_intersection (x + xd, y + yd, xd, yd, 639);
}
move_bat (&bat0, dbat0);
move_bat (&bat1, dbat1);
gpu_write (0, x);
gpu_write (1, y);
gpu_write (2, bat0);
gpu_write (3, bat1);
msleep (2);
}
}
}
//-------------------------------------------------------------------------
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