From 469212f7ee42d04e3160d357ed1f088f12edd391 Mon Sep 17 00:00:00 2001
From: Seth Barberee <seth.barberee@gmail.com>
Date: Mon, 4 Jan 2021 13:40:33 -0600
Subject: CPU and GPU Reg Funcs Decomp (#16)

* decomp/doc cpu funcs and gpu reg funcs

* use Cpu32 macro funcs

* address review comments

* decomp SetBGOBJEnableFlags
---
 src/code_800C9CC.c | 172 ++++++++++++++++++++---------------------------------
 1 file changed, 65 insertions(+), 107 deletions(-)

(limited to 'src/code_800C9CC.c')

diff --git a/src/code_800C9CC.c b/src/code_800C9CC.c
index ddc49c6..28ce10a 100644
--- a/src/code_800C9CC.c
+++ b/src/code_800C9CC.c
@@ -1,23 +1,17 @@
 #include "global.h"
 #include "input.h"
-
-struct unkStruct_809CC88
-{
-    u16 padding;
-    u16 unk2;
-    u16 unk4;
-    u16 unk6;
-};
+#include "bg.h"
 
 extern u16 gRawKeyInput;
 extern u8 gUnknown_202D6B8;
 extern u8 gUnknown_202D6B9;
 extern u16 gUnknown_202D7FA;
+extern u8 gUnknown_202D7FE;
 
-extern struct unkStruct_809CC88 gUnknown_202D698;
-extern struct unkStruct_809CC88 gUnknown_202D6A0;
-extern struct unkStruct_809CC88 gUnknown_202D6A8;
-extern struct unkStruct_809CC88 gUnknown_202D6B0;
+extern struct BGControlStruct gUnknown_202D698;
+extern struct BGControlStruct gUnknown_202D6A0;
+extern struct BGControlStruct gUnknown_202D6A8;
+extern struct BGControlStruct gUnknown_202D6B0;
 
 void ReadKeyInput(struct Inputs *r0)
 {
@@ -97,122 +91,86 @@ void sub_800CC44(s32 r0, s32 r1)
 
 }
 
-void sub_800CC88(u32 r0, u32 r1)
+void SetBG0RegOffsets(s32 xoffset, s32 yoffset)
 {
-    gUnknown_202D698.unk4 = r0;
-    gUnknown_202D698.unk6 = r1;
+    gUnknown_202D698.hofs = xoffset;
+    gUnknown_202D698.vofs = yoffset;
 }
 
-void sub_800CC94(u32 r0, u32 r1)
+void SetBG1RegOffsets(s32 xoffset, s32 yoffset)
 {
-    gUnknown_202D6A0.unk4 = r0;
-    gUnknown_202D6A0.unk6 = r1;
+    gUnknown_202D6A0.hofs = xoffset;
+    gUnknown_202D6A0.vofs = yoffset;
 }
 
-void sub_800CCA0(u32 r0, u32 r1)
+void SetBG2RegOffsets(s32 xoffset, s32 yoffset)
 {
-    gUnknown_202D6A8.unk4 = r0;
-    gUnknown_202D6A8.unk6 = r1;
+    gUnknown_202D6A8.hofs = xoffset;
+    gUnknown_202D6A8.vofs = yoffset;
 }
 
-void sub_800CCAC(u32 r0, u32 r1)
+void SetBG3RegOffsets(s32 xoffset, s32 yoffset)
 {
-    gUnknown_202D6B0.unk4 = r0;
-    gUnknown_202D6B0.unk6 = r1;
+    gUnknown_202D6B0.hofs = xoffset;
+    gUnknown_202D6B0.vofs = yoffset;
 }
 
-void sub_800CCB8(s32 r0, u32 r1, u32 r2)
+void SetBGRegOffsets(s32 reg, u32 xoffset, s32 yoffset)
 {
-    if(r0 == 1)
-    {
-        goto _0800CCD4;
-    }
-    if(r0 <= 1)
-    {
-        goto _0800CCCA;
-    }
-    if(r0 == 2)
-    {
-        goto _0800CCDE;
+    switch (reg) {
+        default:
+        case 0: return SetBG0RegOffsets(xoffset, yoffset);
+        case 1: return SetBG1RegOffsets(xoffset, yoffset);
+        case 2: return SetBG2RegOffsets(xoffset, yoffset);
+        case 3: return SetBG3RegOffsets(xoffset, yoffset);
     }
-    if(r0 == 3)
-    {
-        goto _0800CCE8;
-    }
-   
-    _0800CCCA:
-        sub_800CC88(r1, r2);
-        return;
-    _0800CCD4:
-        sub_800CC94(r1, r2);
-        return;
-    _0800CCDE:
-        sub_800CCA0(r1, r2);
-        return;
-    _0800CCE8:
-        sub_800CCAC(r1, r2);
 }
 
-void sub_800CCF4(s32 r0, u32 r1)
+void SetBGRegXOffset(s32 reg, s32 offset)
 {
-    if(r0 == 1)
-    {
-        goto _0800CD10;
-    }
-    if(r0 <= 1)
-    {
-        goto _0800CD06;
+    switch (reg) {
+        default:
+        case 0:
+            gUnknown_202D698.hofs = offset;
+            break;
+        case 1:
+            gUnknown_202D6A0.hofs = offset;
+            break;
+        case 2:
+            gUnknown_202D6A8.hofs = offset;
+            break;
+        case 3:
+            gUnknown_202D6B0.hofs = offset;
+            break;
     }
-    if(r0 == 2)
-    {
-        goto _0800CD18;
-    }
-    if(r0 == 3)
-    {
-        goto _0800CD20;
-    }
-
-    _0800CD06:
-        gUnknown_202D698.unk4 = r1;
-        return;
-    _0800CD10:
-        gUnknown_202D6A0.unk4 = r1;
-        return;
-    _0800CD18:
-        gUnknown_202D6A8.unk4 = r1;
-        return;
-    _0800CD20:
-        gUnknown_202D6B0.unk4 = r1;
 }
 
-void sub_800CD2C(s32 r0, u32 r1)
+void SetBGRegYOffset(s32 reg, s32 offset)
 {
-    if(r0 == 1)
-    {
-        goto _0800CD48;
-    }
-    if(r0 <= 1)
-    {
-        goto _0800CD3E;
-    }
-    if(r0 == 2)
-    {
-        goto _0800CD50;
-    }
-    if(r0 == 3)
-    {
-        goto _0800CD58;
+    switch (reg) {
+        default:
+        case 0:
+            gUnknown_202D698.vofs = offset;
+            break;
+        case 1:
+            gUnknown_202D6A0.vofs = offset;
+            break;
+        case 2:
+            gUnknown_202D6A8.vofs = offset;
+            break;
+        case 3:
+            gUnknown_202D6B0.vofs = offset;
+            break;
     }
+}
 
-    _0800CD3E:
-        gUnknown_202D698.unk6 = r1;
-        return;
-    _0800CD48:
-        gUnknown_202D6A0.unk6 = r1;
-        return;
-    _0800CD50:
-        gUnknown_202D6A8.unk6 = r1;
-        return;
-    _0800CD58:
-        gUnknown_202D6B0.unk6 = r1;
+void sub_800CD64(s32 r0, u8 r1)
+{
+    gUnknown_202D7FE = r1;
+    gUnknown_202D6A8.unk2 = r0 ? 0x8000 : 0; 
+}
+
+void SetBGOBJEnableFlags(u32 mask)
+{
+    REG_DISPCNT = (REG_DISPCNT & 0xe0ff) | (~(mask << 8) & (DISPCNT_BG_ALL_ON | DISPCNT_OBJ_ON));
 }
-- 
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