From a142dc3c9391f6218e500db0619f3a7835bd9c7e Mon Sep 17 00:00:00 2001
From: Vicki Pfau <vi@endrift.com>
Date: Mon, 10 Apr 2017 01:47:00 -0700
Subject: [PATCH] DS Video: Bitmap sprites use alpha bit for transparent

---
 CHANGES                          | 1 +
 src/gba/renderers/software-obj.c | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/CHANGES b/CHANGES
index f8aa5b761..5eadc5f68 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4,6 +4,7 @@ Bugfixes:
  - DS Video: Fix extended modes 1.x screen base range (fixes mgba.io/i/568)
  - DS GX: Fix T-repeat textures (fixes mgba.io/i/577)
  - DS Video: Capture with alpha bit set
+ - DS Video: Bitmap sprites use alpha bit for transparent
 Misc:
  - DS: Set boot complete bit in RAM on boot (fixes mgba.io/i/576, mgba.io/i/580, mgba.io/i/586)
 
diff --git a/src/gba/renderers/software-obj.c b/src/gba/renderers/software-obj.c
index a0885fc60..a8af89a81 100644
--- a/src/gba/renderers/software-obj.c
+++ b/src/gba/renderers/software-obj.c
@@ -197,7 +197,7 @@
 	LOAD_16(tileData, spriteBase & VRAM_BLOCK_MASK, vramBase); \
 	current = renderer->spriteLayer[outX]; \
 	if ((current & FLAG_ORDER_MASK) > flags) { \
-		if (tileData) { \
+		if (tileData & 0x8000) { \
 			uint32_t color; \
 			TILE_TO_COLOR(tileData); \
 			renderer->spriteLayer[outX] = color | flags; \
@@ -215,7 +215,7 @@
 		return 0; \
 	} \
 	LOAD_16(tileData, spriteBase & VRAM_BLOCK_MASK, vramBase); \
-	if (tileData) { \
+	if (tileData & 0x8000) { \
 		renderer->row[outX] |= FLAG_OBJWIN; \
 	}