Add debug render mode and fix vertical flip bit for bg tiles

1 files changed, 8 insertions, 0 deletions

diff --git a/vdp.h b/vdp.h
index d4b7f49..6c9bbf1 100644
--- a/vdp.h
+++ b/vdp.h
@@ -18,6 +18,14 @@
 #define MAX_SPRITES_FRAME 80
 #define MAX_SPRITES_FRAME_H32 64
 
+#define FBUF_BIT_PRIORITY 0x1000
+#define FBUF_SRC_MASK 0xE000
+#define FBUF_SRC_A 0x0000
+#define FBUF_SRC_W 0x2000
+#define FBUF_SRC_B 0x4000
+#define FBUF_SRC_S 0x6000
+#define FBUF_SRC_BG 0x8000
+
 enum {
 	REG_MODE_1=0,
 	REG_MODE_2,