+/* REG_BLDCNT bits */
+#define BLDCNT_A_BG0 0x0001
+#define BLDCNT_A_BG1 0x0002
+#define BLDCNT_A_BG2 0x0004
+#define BLDCNT_A_BG3 0x0008
+#define BLDCNT_A_OBJ 0x0010
+#define BLDCNT_A_BACKDROP 0x0020
+#define BLDCNT_B_BG0 0x0100
+#define BLDCNT_B_BG1 0x0200
+#define BLDCNT_B_BG2 0x0400
+#define BLDCNT_B_BG3 0x0800
+#define BLDCNT_B_OBJ 0x1000
+#define BLDCNT_B_BACKDROP 0x2000
+
+#define BLDCNT_ALPHA 0x0040
+#define BLDCNT_BRIGHTEN 0x0080
+#define BLDCNT_DARKEN 0x00c0
+