From 4f66956b93358d943df0610015e02865d1c3339d Mon Sep 17 00:00:00 2001
From: James <james.mckenzie@citrix.com>
Date: Fri, 11 Oct 2013 10:34:23 +0100
Subject: now with scores

---
 software/pong3/pong3.c | 167 ++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 146 insertions(+), 21 deletions(-)

(limited to 'software/pong3')

diff --git a/software/pong3/pong3.c b/software/pong3/pong3.c
index 39ee99c..09240ff 100644
--- a/software/pong3/pong3.c
+++ b/software/pong3/pong3.c
@@ -10,18 +10,47 @@
 
 #define msleep(msec) usleep(1000*msec);
 
- 
+
+static void
+pio_write (unsigned int data)
+{
+  IOWR (PIO_0_BASE, 0, data);
+}
+
+
 static void
 gpu_write (unsigned int reg, unsigned int data)
 {
   IOWR (GPU_0_BASE, reg << 2, data);
 }
 
+static void
+show_score (int score)
+{
+  const uint8_t lookup[10] =
+    { 0x3F, 0x6, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x7, 0x7F, 0x6F };
+  uint8_t ss = 0;
+
+  if (score < 0)
+    {
+      ss |= 0x80;
+      score = -score;
+    }
+  if (score > 9)
+    score = 9;
+  ss |= lookup[score];
+
+  pio_write (ss);
+}
+
 static void
 load_sprite (void)
 {
-  const uint16_t sprite[16]={ 0x00C0, 0x03E0, 0x0FF8, 0x1FFE, 0x3FC7, 0x3F83, 0x3933, 0x3987, 0x3D37, 0x3D37, 0x3D87, 0x3FFF, 0x1FFE, 0x07F8, 0x01E0, 0x00C0 };
-  const unsigned int n=sizeof(sprite)/sizeof(uint16_t);
+  const uint16_t sprite[16] =
+    { 0x00C0, 0x03E0, 0x0FF8, 0x1FFE, 0x3FC7, 0x3F83, 0x3933, 0x3987, 0x3D37,
+    0x3D37, 0x3D87, 0x3FFF, 0x1FFE, 0x07F8, 0x01E0, 0x00C0
+  };
+  const unsigned int n = sizeof (sprite) / sizeof (uint16_t);
   unsigned int i;
 
   //                      RRR GGG BBB
@@ -29,8 +58,8 @@ load_sprite (void)
   gpu_write (GPU_REG_SPRITE_COLOUR, 0x01D0);
 
   // squirt the bromium logo into the sprite
-  for (i=0;i<n;++i) 
-	  gpu_write (GPU_REG_SPRITE_BASE+i,sprite[i]);
+  for (i = 0; i < n; ++i)
+    gpu_write (GPU_REG_SPRITE_BASE + i, sprite[i]);
 }
 
 
@@ -87,34 +116,87 @@ find_intersection (int x, int y, int xd, int yd, int t)
   return y;
 }
 
+static int
+has_missed (int y1, int y2)
+{
+  y1 = y1 - y2;
+  if (y1 < 0)
+    y1 = -y1;
+  if (y1 > 20)
+    return 1;
+  return 0;
+}
+
+static int
+x_speed (void)
+{
+  return (rand () % 10) + 1;
+}
+
+static int
+y_speed (void)
+{
+  return (rand () % 9) - 4;
+}
+
+
 int
 main (void)
 {
   int x, y, xd, yd;
   int bat0, dbat0;
   int bat1, dbat1;
-  int missed = 0;
+  int score = 0;
+  int serve = 0;
+  int i;
 
   printf ("Working...\n");
   msleep (500);
+
+#if 0
+  while (1)
+    {
+      for (i = -10; i < 10; ++i)
+        {
+          show_score (i);
+          msleep (500);
+        }
+
+    }
+#endif
+
   srand (12392184);
 
-  bat0 = 100;
-  bat1 = 200;
+  bat0 = GPU_HEIGHT / 2;
+  bat1 = GPU_HEIGHT / 2;
 
   load_sprite ();
 
-  while (1)
+  for (;;)
     {
-      x = 1;
-      y = 1;
-      xd = 1;
-      yd = 1;
+      xd = x_speed ();
+      yd = y_speed ();
 
-      dbat0 = find_intersection (x + xd, y + yd, xd, yd, 0);
-      dbat1 = find_intersection (x + xd, y + yd, xd, yd, GPU_WIDTH-1);
+      show_score (score);
 
-      while (!missed)
+      if (!serve)
+        {
+          x = 1;
+          y = bat0;
+          dbat0 = GPU_HEIGHT / 2;
+          dbat1 = find_intersection (x + xd, y + yd, xd, yd, GPU_WIDTH - 1);
+        }
+      else
+        {
+          x = GPU_WIDTH - 2;
+          y = bat1;
+          yd = -yd;
+          dbat0 = find_intersection (x + xd, y + yd, xd, yd, 0);
+          dbat1 = GPU_HEIGHT / 2;
+        }
+      serve = !serve;
+
+      for (;;)
         {
           x += xd;
           y += yd;
@@ -125,22 +207,35 @@ main (void)
 
           if (squish (&x, 0, GPU_WIDTH))
             {
-              xd = (rand () % 3) + 1;
+              xd = x_speed ();
               if (x)
                 xd = -xd;
-              yd = rand () % 7;
-              yd -= 3;
+              yd = y_speed ();
 
               if (x)
                 {
+
+                  if (has_missed (y, bat1))
+                    {
+                      score++;
+                      break;
+                    }
                   dbat0 = find_intersection (x + xd, y + yd, xd, yd, 0);
                   dbat1 = GPU_HEIGHT / 2;
+
                 }
               else
                 {
+
+                  if (has_missed (y, bat0))
+                    {
+                      score--;
+                      break;
+                    }
                   dbat0 = GPU_HEIGHT / 2;
+                  dbat1 =
+                    find_intersection (x + xd, y + yd, xd, yd, GPU_WIDTH - 1);
 
-                  dbat1 = find_intersection (x + xd, y + yd, xd, yd, GPU_WIDTH-1);
                 }
             }
 
@@ -157,6 +252,36 @@ main (void)
 
           msleep (2);
         }
+
+      if (!serve)
+        {
+          dbat1 = GPU_HEIGHT / 2;
+          dbat0 = bat0;
+        }
+      else
+        {
+          dbat0 = GPU_HEIGHT / 2;
+          dbat1 = bat1;
+        }
+
+      for (i = 0; i < 200; ++i)
+        {
+          if (i == 100)
+            show_score (score);
+
+          move_bat (&bat0, dbat0);
+          move_bat (&bat1, dbat1);
+
+
+          gpu_write (1, x + GPU_OFFSET);
+          gpu_write (2, y + GPU_OFFSET);
+          gpu_write (3, bat0 + GPU_OFFSET);
+          gpu_write (4, bat1 + GPU_OFFSET);
+
+          gpu_write (0, 0);
+
+          msleep (2);
+
+        }
     }
 }
-
-- 
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