1 files changed, 151 insertions, 0 deletions
diff --git a/software/pong3/pong3.c b/software/pong3/pong3.c
new file mode 100644
index 0000000..63ae56c
--- /dev/null
+++ b/software/pong3/pong3.c
@@ -0,0 +1,151 @@
+#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);
+        }
+    }
+}
+
+//-------------------------------------------------------------------------