1 files changed, 79 insertions, 1 deletions
diff --git a/src/screenTilemap.c b/src/screenTilemap.c
index d6079438..b32378a8 100644
--- a/src/screenTilemap.c
+++ b/src/screenTilemap.c
@@ -1,6 +1,84 @@
 #include "global.h"
+#include "room.h"
 
-ASM_FUNC("asm/non_matching/code_0807CC3C/sub_0807D280.inc", void sub_0807D280(u32 unk_1, u32 unk_2))
+void sub_0807D280(u16* mapspecial, u16* bgbuffer) {
+    u32 unk_18;
+    s32 tmp1, tmp2, tmp3, tmp4, tmp5, tmp6;
+    s32 xdiff, ydiff;
+    s32 i, j, index_hack;
+
+    xdiff = (gRoomControls.scroll_x - gRoomControls.origin_x);
+    ydiff = (gRoomControls.scroll_y - gRoomControls.origin_y);
+    switch (gRoomControls.scroll_direction) {
+        case 0:
+            if ((gRoomControls.unk_18 & 3) != 1) {
+                return;
+            }
+            for (i = 0x1c; i > 0; i--) {
+                DmaSet(3, bgbuffer + 0x20 * (i - 1), bgbuffer + 0x20 * (i + 1), 0x80000020);
+            }
+
+            tmp1 = (gRoomControls.height >> 4) - 1;
+            tmp2 = (gRoomControls.unk_18 >> 2);
+            tmp3 = (tmp1 - tmp2) << 8;
+            tmp3 += (xdiff >> 4) * 2;
+            mapspecial = mapspecial + tmp3;
+            DmaSet(3, mapspecial, bgbuffer, 0x80000020);
+            DmaSet(3, mapspecial + 0x80, bgbuffer + 0x20, 0x80000020);
+            return;
+        case 1:
+            if ((gRoomControls.unk_18 & 3) != 0) {
+                return;
+            } else if (gRoomControls.unk_18 != 0) {
+                for (i = 0; i < 0x16; i++) {
+                    DmaSet(3, bgbuffer + 0x20 * i + 2, bgbuffer + 0x20 * i, 0x8000001e);
+                }
+            }
+
+            mapspecial = mapspecial + ((ydiff >> 4) * 0x100 + ((gRoomControls.unk_18 >> 2) << 1));
+            bgbuffer = bgbuffer + 0x1e;
+
+            for (i = 0; i < 0x16; bgbuffer += 0x20, mapspecial += 0x80, i++) {
+                bgbuffer[0] = mapspecial[0];
+                bgbuffer[1] = mapspecial[1];
+            }
+
+            return;
+        case 2:
+            unk_18 = gRoomControls.unk_18;
+
+            if ((unk_18 & 3) != 0) {
+                return;
+            } else if (unk_18 << 0x10 != 0) {
+                DmaSet(3, bgbuffer + 0x40, bgbuffer, 0x800003c0);
+            }
+
+            mapspecial = mapspecial + (((unk_18 * 0x10000 >> 0x12) << 8) + ((xdiff >> 4) << 1));
+            DmaSet(3, mapspecial, bgbuffer + 0x280, 0x80000020);
+            DmaSet(3, mapspecial + 0x80, bgbuffer + 0x2a0, 0x80000020);
+            return;
+        default:
+            if ((gRoomControls.unk_18 & 3) == 1) {
+                for (i = 0; i < 0x16; i++) {
+                    for (j = 0x1d; j >= 0; j--) {
+                        index_hack = i + 1;
+                        bgbuffer[(index_hack - 1) * 0x20 + j + 2] = bgbuffer[(index_hack - 1) * 0x20 + j];
+                    }
+                }
+
+                tmp4 = (ydiff >> 4) * 0x100;
+                tmp5 = ((gRoomControls.width >> 4) - 1);
+                tmp6 = (u32)(gRoomControls.unk_18 >> 2);
+                mapspecial = mapspecial + (tmp4 + ((tmp5 - tmp6) << 1));
+
+                for (i = 0; i < 0x16; bgbuffer += 0x20, mapspecial += 0x80, i++) {
+                    bgbuffer[0] = mapspecial[0];
+                    bgbuffer[1] = mapspecial[1];
+                }
+            }
+            return;
+    }
+}
 
 ASM_FUNC("asm/non_matching/code_0807CC3C/sub_0807D46C.inc", void sub_0807D46C(u32 unk_1, u32 unk_2))