From b7fd4f975debde2c4683d95516a0be6626988a71 Mon Sep 17 00:00:00 2001
From: Ben Vanik <ben.vanik@gmail.com>
Date: Wed, 25 Sep 2013 00:46:47 -0700
Subject: [PATCH] Fixing ringbuffer pointers and no-op instructions.

---
 src/xenia/gpu/ring_buffer_worker.cc | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/xenia/gpu/ring_buffer_worker.cc b/src/xenia/gpu/ring_buffer_worker.cc
index 58a9000eb..2bf81bef0 100644
--- a/src/xenia/gpu/ring_buffer_worker.cc
+++ b/src/xenia/gpu/ring_buffer_worker.cc
@@ -116,6 +116,12 @@ void RingBufferWorker::ExecuteSegment(uint32_t ptr, uint32_t length) {
     const uint8_t* packet_base = p + ptr + n * 4;
     const uint32_t packet = XEGETUINT32BE(packet_base);
     const uint32_t packet_type = packet >> 30;
+
+    if (packet == 0) {
+      n++;
+      continue;
+    }
+
     switch (packet_type) {
     case 0x00:
       {
@@ -157,6 +163,7 @@ void RingBufferWorker::ExecuteSegment(uint32_t ptr, uint32_t length) {
     case 0x02:
       // Type-2 packet.
       // No-op. Do nothing.
+      n++;
       break;
     case 0x03:
       {
@@ -215,7 +222,7 @@ void RingBufferWorker::ExecuteSegment(uint32_t ptr, uint32_t length) {
             // value?
             uint32_t d2 = XEGETUINT32BE(packet_base + 3 * 4);
             XESETUINT32BE(
-                p + d1 + (primary_buffer_ptr_ & ~0x1FFFFFFF), d2);
+                p + (d1 & ~0x3) + (primary_buffer_ptr_ & ~0x1FFFFFFF), d2);
           }
           break;