sub_812D420

3 files changed, 31 insertions, 140 deletions

diff --git a/asm/fame_checker.s b/asm/fame_checker.s
index 49b957eb3..f04455117 100644
--- a/asm/fame_checker.s
+++ b/asm/fame_checker.s
@@ -5,146 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_812D420
-sub_812D420: @ 812D420
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	sub sp, 0x8
-	movs r3, 0xC0
-	lsls r3, 19
-	movs r4, 0xC0
-	lsls r4, 9
-	add r0, sp, 0x4
-	mov r8, r0
-	mov r2, sp
-	movs r6, 0
-	ldr r1, _0812D550 @ =0x040000d4
-	movs r5, 0x80
-	lsls r5, 5
-	ldr r7, _0812D554 @ =0x81000800
-	movs r0, 0x81
-	lsls r0, 24
-	mov r12, r0
-_0812D446:
-	strh r6, [r2]
-	mov r0, sp
-	str r0, [r1]
-	str r3, [r1, 0x4]
-	str r7, [r1, 0x8]
-	ldr r0, [r1, 0x8]
-	adds r3, r5
-	subs r4, r5
-	cmp r4, r5
-	bhi _0812D446
-	strh r6, [r2]
-	mov r2, sp
-	str r2, [r1]
-	str r3, [r1, 0x4]
-	lsrs r0, r4, 1
-	mov r2, r12
-	orrs r0, r2
-	str r0, [r1, 0x8]
-	ldr r0, [r1, 0x8]
-	movs r0, 0xE0
-	lsls r0, 19
-	movs r3, 0x80
-	lsls r3, 3
-	movs r4, 0
-	str r4, [sp, 0x4]
-	ldr r2, _0812D550 @ =0x040000d4
-	mov r1, r8
-	str r1, [r2]
-	str r0, [r2, 0x4]
-	lsrs r0, r3, 2
-	movs r1, 0x85
-	lsls r1, 24
-	orrs r0, r1
-	str r0, [r2, 0x8]
-	ldr r0, [r2, 0x8]
-	movs r1, 0xA0
-	lsls r1, 19
-	mov r0, sp
-	strh r4, [r0]
-	str r0, [r2]
-	str r1, [r2, 0x4]
-	lsrs r3, 1
-	movs r0, 0x81
-	lsls r0, 24
-	orrs r3, r0
-	str r3, [r2, 0x8]
-	ldr r0, [r2, 0x8]
-	movs r0, 0
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x8
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x10
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x12
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0xA
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x14
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x16
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0xC
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x18
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x1A
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0xE
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x1C
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x1E
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x40
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x44
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x48
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x4A
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x50
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x52
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x54
-	movs r1, 0
-	bl SetGpuReg
-	add sp, 0x8
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.align 2, 0
-_0812D550: .4byte 0x040000d4
-_0812D554: .4byte 0x81000800
-	thumb_func_end sub_812D420
-
 	thumb_func_start sub_812D558
 sub_812D558: @ 812D558
 	push {lr}
diff --git a/include/gba/macro.h b/include/gba/macro.h
index 462d3589d..c0a4e481b 100644
--- a/include/gba/macro.h
+++ b/include/gba/macro.h
@@ -125,6 +125,9 @@
 
 #define DmaCopyLarge32(dmaNum, src, dest, size, block) DmaCopyLarge(dmaNum, src, dest, size, block, 32)
 
+#define DmaClearLarge16(dmaNum, dest, size, block) DmaClearLarge(dmaNum, dest, size, block, 16)
+#define DmaClearLarge32(dmaNum, dest, size, block) DmaClearLarge(dmaNum, dest, size, block, 32)
+
 #define DmaCopyDefvars(dmaNum, src, dest, size, bit) \
 {                                                    \
     const void *_src = src;                          \
diff --git a/src/fame_checker.c b/src/fame_checker.c
index 436e60b3a..543fd8b87 100644
--- a/src/fame_checker.c
+++ b/src/fame_checker.c
@@ -671,3 +671,31 @@ void sub_812D388(void)
         }
     }
 }
+
+void sub_812D420(void)
+{
+    void * vram = (void *)VRAM;
+    DmaClearLarge16(3, vram, VRAM_SIZE, 0x1000);
+    DmaClear32(3, OAM, OAM_SIZE);
+    DmaClear16(3, PLTT, PLTT_SIZE);
+    SetGpuReg(REG_OFFSET_DISPCNT,  0);
+    SetGpuReg(REG_OFFSET_BG0CNT,   0);
+    SetGpuReg(REG_OFFSET_BG0HOFS,  0);
+    SetGpuReg(REG_OFFSET_BG0VOFS,  0);
+    SetGpuReg(REG_OFFSET_BG1CNT,   0);
+    SetGpuReg(REG_OFFSET_BG1HOFS,  0);
+    SetGpuReg(REG_OFFSET_BG1VOFS,  0);
+    SetGpuReg(REG_OFFSET_BG2CNT,   0);
+    SetGpuReg(REG_OFFSET_BG2HOFS,  0);
+    SetGpuReg(REG_OFFSET_BG2VOFS,  0);
+    SetGpuReg(REG_OFFSET_BG3CNT,   0);
+    SetGpuReg(REG_OFFSET_BG3HOFS,  0);
+    SetGpuReg(REG_OFFSET_BG3VOFS,  0);
+    SetGpuReg(REG_OFFSET_WIN0H,    0);
+    SetGpuReg(REG_OFFSET_WIN0V,    0);
+    SetGpuReg(REG_OFFSET_WININ,    0);
+    SetGpuReg(REG_OFFSET_WINOUT,   0);
+    SetGpuReg(REG_OFFSET_BLDCNT,   0);
+    SetGpuReg(REG_OFFSET_BLDALPHA, 0);
+    SetGpuReg(REG_OFFSET_BLDY,     0);
+}