From 8a7f8c67fce5b760320c0758662d7528cf979bd9 Mon Sep 17 00:00:00 2001
From: Vicki Pfau <vi@endrift.com>
Date: Sun, 28 Jun 2020 15:42:10 -0700
Subject: [PATCH] GBA Video: Fix invalid read in mode 4 mosaic

---
 CHANGES                         | 1 +
 src/gba/renderers/software-bg.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/CHANGES b/CHANGES
index 2815b229c..d145b1ca4 100644
--- a/CHANGES
+++ b/CHANGES
@@ -22,6 +22,7 @@ Emulation fixes:
  - GBA SIO: Fix copying Normal mode transfer values
  - GBA Video: Latch scanline at end of Hblank (fixes mgba.io/i/1319)
  - GBA Video: Fix Hblank timing
+ - GBA Video: Fix invalid read in mode 4 mosaic
  - SM83: Emulate HALT bug
 Other fixes:
  - All: Improve export headers (fixes mgba.io/i/1738)
diff --git a/src/gba/renderers/software-bg.c b/src/gba/renderers/software-bg.c
index db4b33e71..742e126b5 100644
--- a/src/gba/renderers/software-bg.c
+++ b/src/gba/renderers/software-bg.c
@@ -128,7 +128,7 @@ void GBAVideoSoftwareRendererDrawBackgroundMode3(struct GBAVideoSoftwareRenderer
 void GBAVideoSoftwareRendererDrawBackgroundMode4(struct GBAVideoSoftwareRenderer* renderer, struct GBAVideoSoftwareBackground* background, int inY) {
 	BACKGROUND_BITMAP_INIT;
 
-	uint16_t color = renderer->normalPalette[0];
+	uint16_t color = 0;
 	uint32_t offset = 0;
 	if (GBARegisterDISPCNTIsFrameSelect(renderer->dispcnt)) {
 		offset = 0xA000;