From 791cc2670e8dc4ac04056f7bfa9aaf55cf442195 Mon Sep 17 00:00:00 2001
From: Ivan Dardi <ivy.dardi@gmail.com>
Date: Sat, 15 Oct 2016 20:04:34 -0300
Subject: [PATCH] Ensure there isn't a stream of tiles repeatedly

---
 main.asm | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/main.asm b/main.asm
index bc01ab7..5e495a1 100644
--- a/main.asm
+++ b/main.asm
@@ -316,12 +316,17 @@ FUNCTION_BEGIN CreateRandomTiles
 CreateRandomTiles.forloop:
     beq  $s0, $s1, CreateRandomTiles.endforloop
     
+CreateRandomTiles.retryunique:
     # Get random number in interval [0, 3]
     xor  $a0, $a0, $a0
     syscall
     
     # Add 1 to get [1, 4]
     addi $a0, $a0, 1
+
+    # Ensure that the new tile isn't the same as the previous one
+    lw   $t0, -4($s0)
+    beq  $t0, $a0, CreateRandomTiles.retryunique
     
     # Write to the vector
     sw   $a0, 0($s0)