Cleanup bg.c

common_syms/bg.txt

@@ -0,0 +1 @@
+gUnneededFireRedVariable

data/bg.s

@@ -1,7 +0,0 @@
-	.include "asm/macros.inc"
-	.include "constants/constants.inc"
-
-	.section .rodata
-
-gZeroedBgControlStruct:: @ 82E9580
-	.4byte 0

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

include/gba/defines.h

@@ -34,8 +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)

ld_script.txt

@@ -268,7 +268,7 @@ SECTIONS {
     ALIGN(4)
     {
         src/main.o(.rodata);
-        data/bg.o(.rodata);
+        src/bg.o(.rodata);
         src/window.o(.rodata);
         src/text.o(.rodata);
         src/sprite.o(.rodata);

sym_bss.txt

@@ -23,20 +23,7 @@ gDma3RequestCursor: @ 3000811
 	.space 0x7
 
 	.include "src/gpu_regs.o"
-
-	.align 4
-gUnknown_030008E0: @ 30008E0
-	.space 0x18
-
-gUnknown_030008F8: @ 30008F8
-	.space 0x4
-
-gUnknown_030008FC: @ 30008FC
-	.space 0x3C
-
-gUnknown_03000938: @ 3000938
-	.space 0x10
-
+    .include "src/bg.o"
 	.include "src/text.o"
 	.include "src/sprite.o"
 

sym_common.txt

@@ -39,9 +39,9 @@ IntrMain_Buffer: @ 3002750
 gPcmDmaCounter: @ 3002F50
 	.space 0x4
 
-gUnneededFireRedVariable: @ 3002F54
-	.space 0xC
+	.include "bg.o"
 
+    .align 4
 gUnknown_03002F60: @ 3002F60
 	.space 0x10