From 7c8d253123733d667e271668f00bacceb390175d Mon Sep 17 00:00:00 2001
From: Vicki Pfau <vi@endrift.com>
Date: Fri, 6 Sep 2019 21:24:51 -0700
Subject: [PATCH] GB: SGB bug compat

---
 src/gb/video.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/gb/video.c b/src/gb/video.c
index 329174e02..43a9d7637 100644
--- a/src/gb/video.c
+++ b/src/gb/video.c
@@ -701,6 +701,9 @@ void GBVideoWriteSGBPacket(struct GBVideo* video, uint8_t* data) {
 	case SGB_ATTR_SET:
 		break;
 	case SGB_MLT_REQ:
+		if ((video->sgbPacketBuffer[1] & 0x3) == 2) { // XXX: This unmasked increment appears to be an SGB hardware bug
+			++video->p->sgbCurrentController;
+		}
 		video->p->sgbControllers = video->sgbPacketBuffer[1] & 0x3;
 		video->p->sgbCurrentController &= video->p->sgbControllers;
 		return;