start working on battle interface

include/battle.h

@@ -903,11 +903,21 @@ struct BattleHealthboxInfo
     u8 field_B;
 };
 
+struct BattleBarInfo
+{
+    u8 healthboxSpriteId;
+    u32 maxValue;
+    u32 currentValue;
+    bool32 isDoubleBattle;
+    s32 field_10;
+};
+
 struct BattleSpriteData
 {
     struct BattleSpriteInfo *bankData;
     struct BattleHealthboxInfo *healthBoxesData;
     struct BattleAnimationInfo *animationData;
+    struct BattleBarInfo *battleBars;
 };
 
 extern struct BattleSpriteData *gBattleSpritesDataPtr;

include/gba/types.h

@@ -39,18 +39,18 @@ struct PlttData
 struct OamData
 {
     /*0x00*/ u32 y:8;
-    /*0x01*/ u32 affineMode:2;
-             u32 objMode:2;
-             u32 mosaic:1;
-             u32 bpp:1;
-             u32 shape:2;
+    /*0x01*/ u32 affineMode:2;  // 0x1, 0x2 -> 0x4
+             u32 objMode:2;     // 0x4, 0x8 -> 0xC
+             u32 mosaic:1;      // 0x10
+             u32 bpp:1;         // 0x20
+             u32 shape:2;       // 0x40, 0x80 -> 0xC0
 
     /*0x02*/ u32 x:9;
              u32 matrixNum:5; // bits 3/4 are h-flip/v-flip if not in affine mode
              u32 size:2;
 
-    /*0x04*/ u16 tileNum:10;
-             u16 priority:2;
+    /*0x04*/ u16 tileNum:10;    // 0x33F
+             u16 priority:2;    // 0x400, 0x800 -> 0xC00
              u16 paletteNum:4;
     /*0x06*/ u16 affineParam;
 };