2 files changed, 79 insertions, 2 deletions
diff --git a/include/bg.h b/include/bg.h
new file mode 100644
index 000000000..b9410afa3
--- /dev/null
+++ b/include/bg.h
@@ -0,0 +1,70 @@
+#ifndef GUARD_BG_H
+#define GUARD_BG_H
+
+#include "global.h"
+
+enum {
+    BG_CTRL_ATTR_VISIBLE = 1,
+    BG_CTRL_ATTR_CHARBASEINDEX = 2,
+    BG_CTRL_ATTR_MAPBASEINDEX = 3,
+    BG_CTRL_ATTR_SCREENSIZE = 4,
+    BG_CTRL_ATTR_PALETTEMODE = 5,
+    BG_CTRL_ATTR_PRIORITY = 6,
+    BG_CTRL_ATTR_MOSAIC = 7,
+    BG_CTRL_ATTR_WRAPAROUND = 8,
+};
+
+struct BgControl {
+    struct BgConfig {
+        u16 visible:1;
+        u16 unknown_1:1;
+        u16 screenSize:2;
+        u16 priority:2;
+        u16 mosaic:1;
+        u16 wraparound:1;
+        
+        u16 charBaseIndex:2;
+        u16 mapBaseIndex:5;
+        u16 paletteMode:1;
+        
+        u8 unknown_2;
+        u8 unknown_3;
+    } configs[4];
+    
+    u16 bgVisibilityAndMode;
+};
+
+struct BgTemplate {
+    u32 bg:2;
+    u32 charBaseIndex:2;
+    u32 mapBaseIndex:5;
+    u32 screenSize:2;
+    u32 paletteMode:1;
+    u32 priority:2;
+    u32 baseTile:10;
+};
+
+struct BgConfig2 {
+    u32 baseTile:10;
+    u32 basePalette:4;
+    u32 unk_3:18;
+    
+    void* tilemap;
+    u32 bg_x;
+    u32 bg_y;
+};
+
+bool32 IsInvalidBg32(u8);
+void ResetBgControlStructs();
+u16 GetBgMetricTextMode(u8, u8);
+u32 GetBgMetricAffineMode(u8, u8);
+u32 GetBgType(u8);
+void SetTextModeAndHideBgs();
+bool8 IsInvalidBg(u8);
+bool32 IsTileMapOutsideWram(u8);
+void CopyRectToBgTilemapBufferRect(u8, void*, u8, u8, u8, u8, u8, u8, u8, u8, u8, u16, u16);
+void CopyTileMapEntry(u16*, u16*, s32, u32, u32);
+u32 GetTileMapIndexFromCoords(s32, s32, s32, u32, u32);
+void WriteSequenceToBgTilemapBuffer(u8, u16, u8, u8, u8, u8, u8, s16);
+
+#endif // GUARD_BG_H
diff --git a/include/gba/defines.h b/include/gba/defines.h
index 0f7f06755..e67d64777 100644
--- a/include/gba/defines.h
+++ b/include/gba/defines.h
@@ -15,6 +15,11 @@
 #define INTR_CHECK     (*(u16 *)0x3007FF8)
 #define INTR_VECTOR    (*(void **)0x3007FFC)
 
+#define EWRAM_START 0x02000000
+#define EWRAM_END   (EWRAM_START + 0x40000)
+#define IWRAM_START 0x03000000
+#define IWRAM_END   (IWRAM_START + 0x8000)
+
 #define PLTT      0x5000000
 #define PLTT_SIZE 0x400
 
@@ -29,8 +34,10 @@
 
 #define BG_VRAM           VRAM
 #define BG_VRAM_SIZE      0x10000
-#define BG_CHAR_ADDR(n)   (BG_VRAM + (0x4000 * (n)))
-#define BG_SCREEN_ADDR(n) (BG_VRAM + (0x800 * (n)))
+#define BG_CHAR_SIZE      0x4000
+#define BG_SCREEN_SIZE    0x800
+#define BG_CHAR_ADDR(n)   (BG_VRAM + (BG_CHAR_SIZE * (n)))
+#define BG_SCREEN_ADDR(n) (BG_VRAM + (BG_SCREEN_SIZE * (n)))
 
 // text-mode BG
 #define OBJ_VRAM0      (VRAM + 0x10000)